Commit | Line | Data |
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aa1f3bb5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * USB hub driver. | |
4 | * | |
5 | * (C) Copyright 1999 Linus Torvalds | |
6 | * (C) Copyright 1999 Johannes Erdfelt | |
7 | * (C) Copyright 1999 Gregory P. Smith | |
8 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
9 | * | |
b65fba3d | 10 | * Released under the GPLv2 only. |
1da177e4 LT |
11 | */ |
12 | ||
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/completion.h> | |
5b3cc15a | 18 | #include <linux/sched/mm.h> |
1da177e4 LT |
19 | #include <linux/list.h> |
20 | #include <linux/slab.h> | |
1da177e4 LT |
21 | #include <linux/ioctl.h> |
22 | #include <linux/usb.h> | |
23 | #include <linux/usbdevice_fs.h> | |
27729aad | 24 | #include <linux/usb/hcd.h> |
925aa46b | 25 | #include <linux/usb/otg.h> |
93362a87 | 26 | #include <linux/usb/quirks.h> |
32a69589 | 27 | #include <linux/workqueue.h> |
4186ecf8 | 28 | #include <linux/mutex.h> |
b04b3156 | 29 | #include <linux/random.h> |
ad493e5e | 30 | #include <linux/pm_qos.h> |
201af55d | 31 | #include <linux/kobject.h> |
1da177e4 | 32 | |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/byteorder.h> |
35 | ||
6e30d7cb | 36 | #include "hub.h" |
026f3fcb | 37 | #include "otg_whitelist.h" |
1da177e4 | 38 | |
e6f30dea ML |
39 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
40 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
41 | ||
886ee36e FB |
42 | #define USB_TP_TRANSMISSION_DELAY 40 /* ns */ |
43 | #define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */ | |
44 | ||
fa286188 | 45 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 46 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
47 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
48 | static DEFINE_SPINLOCK(device_state_lock); | |
49 | ||
32a69589 PM |
50 | /* workqueue to process hub events */ |
51 | static struct workqueue_struct *hub_wq; | |
52 | static void hub_event(struct work_struct *work); | |
1da177e4 | 53 | |
d8521afe DW |
54 | /* synchronize hub-port add/remove and peering operations */ |
55 | DEFINE_MUTEX(usb_port_peer_mutex); | |
56 | ||
1da177e4 | 57 | /* cycle leds on hubs that aren't blinking for attention */ |
a44007a4 | 58 | static bool blinkenlights; |
166b8639 CM |
59 | module_param(blinkenlights, bool, S_IRUGO); |
60 | MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); | |
1da177e4 | 61 | |
fd7c519d JK |
62 | /* |
63 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
64 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
65 | */ | |
66 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
67 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
68 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
69 | MODULE_PARM_DESC(initial_descriptor_timeout, |
70 | "initial 64-byte descriptor request timeout in milliseconds " | |
71 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 72 | |
1da177e4 LT |
73 | /* |
74 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
75 | * closely resembles the way Windows works. Hopefully it will be compatible | |
76 | * with a wider range of devices than the old scheme. However some previously | |
77 | * working devices may start giving rise to "device not accepting address" | |
78 | * errors; if that happens the user can try the old scheme by adjusting the | |
79 | * following module parameters. | |
80 | * | |
81 | * For maximum flexibility there are two boolean parameters to control the | |
82 | * hub driver's behavior. On the first initialization attempt, if the | |
83 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
84 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
85 | * is set, then the driver will make another attempt, using the other scheme. | |
86 | */ | |
a44007a4 | 87 | static bool old_scheme_first; |
1da177e4 LT |
88 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
89 | MODULE_PARM_DESC(old_scheme_first, | |
90 | "start with the old device initialization scheme"); | |
91 | ||
90ab5ee9 | 92 | static bool use_both_schemes = 1; |
1da177e4 LT |
93 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
94 | MODULE_PARM_DESC(use_both_schemes, | |
95 | "try the other device initialization scheme if the " | |
96 | "first one fails"); | |
97 | ||
32fe0198 AS |
98 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
99 | * port reset on some companion controllers. | |
100 | */ | |
101 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
102 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
103 | ||
ad493e5e | 104 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
105 | #define HUB_DEBOUNCE_STEP 25 |
106 | #define HUB_DEBOUNCE_STABLE 100 | |
107 | ||
32a69589 | 108 | static void hub_release(struct kref *kref); |
742120c6 | 109 | static int usb_reset_and_verify_device(struct usb_device *udev); |
3bc02bce | 110 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); |
742120c6 | 111 | |
131dec34 | 112 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 113 | { |
d64aab0c ON |
114 | if (hub_is_superspeedplus(hub->hdev)) |
115 | return "10.0 Gb/s"; | |
131dec34 SS |
116 | if (hub_is_superspeed(hub->hdev)) |
117 | return "5.0 Gb/s"; | |
288ead45 | 118 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 119 | return "480 Mb/s"; |
288ead45 | 120 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
121 | return "1.5 Mb/s"; |
122 | else | |
123 | return "12 Mb/s"; | |
124 | } | |
1da177e4 LT |
125 | |
126 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 127 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 128 | { |
ff823c79 | 129 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 130 | return NULL; |
1da177e4 LT |
131 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
132 | } | |
133 | ||
2d2a3167 | 134 | int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c | 135 | { |
ad87e032 AS |
136 | /* Some devices have trouble with LPM */ |
137 | if (udev->quirks & USB_QUIRK_NO_LPM) | |
138 | return 0; | |
139 | ||
d9b2099c SS |
140 | /* USB 2.1 (and greater) devices indicate LPM support through |
141 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
142 | */ | |
a8425292 | 143 | if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { |
d9b2099c SS |
144 | if (udev->bos->ext_cap && |
145 | (USB_LPM_SUPPORT & | |
146 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
147 | return 1; | |
148 | return 0; | |
149 | } | |
51e0a012 | 150 | |
25cd2882 SS |
151 | /* |
152 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. | |
153 | * However, there are some that don't, and they set the U1/U2 exit | |
154 | * latencies to zero. | |
51e0a012 SS |
155 | */ |
156 | if (!udev->bos->ss_cap) { | |
25cd2882 | 157 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
51e0a012 SS |
158 | return 0; |
159 | } | |
51e0a012 | 160 | |
25cd2882 SS |
161 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
162 | udev->bos->ss_cap->bU2DevExitLat == 0) { | |
163 | if (udev->parent) | |
164 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); | |
165 | else | |
166 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); | |
51e0a012 SS |
167 | return 0; |
168 | } | |
51e0a012 | 169 | |
25cd2882 SS |
170 | if (!udev->parent || udev->parent->lpm_capable) |
171 | return 1; | |
d9b2099c SS |
172 | return 0; |
173 | } | |
174 | ||
51e0a012 SS |
175 | /* |
176 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
177 | * either U1 or U2. | |
178 | */ | |
179 | static void usb_set_lpm_mel(struct usb_device *udev, | |
180 | struct usb3_lpm_parameters *udev_lpm_params, | |
181 | unsigned int udev_exit_latency, | |
182 | struct usb_hub *hub, | |
183 | struct usb3_lpm_parameters *hub_lpm_params, | |
184 | unsigned int hub_exit_latency) | |
185 | { | |
186 | unsigned int total_mel; | |
187 | unsigned int device_mel; | |
188 | unsigned int hub_mel; | |
189 | ||
190 | /* | |
191 | * Calculate the time it takes to transition all links from the roothub | |
192 | * to the parent hub into U0. The parent hub must then decode the | |
193 | * packet (hub header decode latency) to figure out which port it was | |
194 | * bound for. | |
195 | * | |
196 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
197 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
198 | */ | |
199 | total_mel = hub_lpm_params->mel + | |
200 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
201 | ||
202 | /* | |
203 | * How long will it take to transition the downstream hub's port into | |
204 | * U0? The greater of either the hub exit latency or the device exit | |
205 | * latency. | |
206 | * | |
207 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
208 | * Multiply that by 1000 to get nanoseconds. | |
209 | */ | |
210 | device_mel = udev_exit_latency * 1000; | |
211 | hub_mel = hub_exit_latency * 1000; | |
212 | if (device_mel > hub_mel) | |
213 | total_mel += device_mel; | |
214 | else | |
215 | total_mel += hub_mel; | |
216 | ||
217 | udev_lpm_params->mel = total_mel; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
222 | * a transition from either U1 or U2. | |
223 | */ | |
224 | static void usb_set_lpm_pel(struct usb_device *udev, | |
225 | struct usb3_lpm_parameters *udev_lpm_params, | |
226 | unsigned int udev_exit_latency, | |
227 | struct usb_hub *hub, | |
228 | struct usb3_lpm_parameters *hub_lpm_params, | |
229 | unsigned int hub_exit_latency, | |
230 | unsigned int port_to_port_exit_latency) | |
231 | { | |
232 | unsigned int first_link_pel; | |
233 | unsigned int hub_pel; | |
234 | ||
235 | /* | |
236 | * First, the device sends an LFPS to transition the link between the | |
237 | * device and the parent hub into U0. The exit latency is the bigger of | |
238 | * the device exit latency or the hub exit latency. | |
239 | */ | |
240 | if (udev_exit_latency > hub_exit_latency) | |
241 | first_link_pel = udev_exit_latency * 1000; | |
242 | else | |
243 | first_link_pel = hub_exit_latency * 1000; | |
244 | ||
245 | /* | |
246 | * When the hub starts to receive the LFPS, there is a slight delay for | |
247 | * it to figure out that one of the ports is sending an LFPS. Then it | |
248 | * will forward the LFPS to its upstream link. The exit latency is the | |
249 | * delay, plus the PEL that we calculated for this hub. | |
250 | */ | |
251 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
252 | ||
253 | /* | |
254 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
255 | * is the greater of the two exit latencies. | |
256 | */ | |
257 | if (first_link_pel > hub_pel) | |
258 | udev_lpm_params->pel = first_link_pel; | |
259 | else | |
260 | udev_lpm_params->pel = hub_pel; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
265 | * when a device initiates a transition to U0, until when it will receive the | |
266 | * first packet from the host controller. | |
267 | * | |
268 | * Section C.1.5.1 describes the four components to this: | |
269 | * - t1: device PEL | |
270 | * - t2: time for the ERDY to make it from the device to the host. | |
271 | * - t3: a host-specific delay to process the ERDY. | |
272 | * - t4: time for the packet to make it from the host to the device. | |
273 | * | |
274 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
275 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
276 | * vendor says otherwise. | |
277 | */ | |
278 | static void usb_set_lpm_sel(struct usb_device *udev, | |
279 | struct usb3_lpm_parameters *udev_lpm_params) | |
280 | { | |
281 | struct usb_device *parent; | |
282 | unsigned int num_hubs; | |
283 | unsigned int total_sel; | |
284 | ||
285 | /* t1 = device PEL */ | |
286 | total_sel = udev_lpm_params->pel; | |
287 | /* How many external hubs are in between the device & the root port. */ | |
288 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
289 | parent = parent->parent) | |
290 | num_hubs++; | |
291 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
292 | if (num_hubs > 0) | |
293 | total_sel += 2100 + 250 * (num_hubs - 1); | |
294 | ||
295 | /* t4 = 250ns * num_hubs */ | |
296 | total_sel += 250 * num_hubs; | |
297 | ||
298 | udev_lpm_params->sel = total_sel; | |
299 | } | |
300 | ||
301 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
302 | { | |
303 | struct usb_hub *hub; | |
304 | unsigned int port_to_port_delay; | |
305 | unsigned int udev_u1_del; | |
306 | unsigned int udev_u2_del; | |
307 | unsigned int hub_u1_del; | |
308 | unsigned int hub_u2_del; | |
309 | ||
8a1b2725 | 310 | if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) |
51e0a012 SS |
311 | return; |
312 | ||
ad493e5e | 313 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
314 | /* It doesn't take time to transition the roothub into U0, since it |
315 | * doesn't have an upstream link. | |
316 | */ | |
317 | if (!hub) | |
318 | return; | |
319 | ||
320 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
4d967995 | 321 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
51e0a012 | 322 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
4d967995 | 323 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
51e0a012 SS |
324 | |
325 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
326 | hub, &udev->parent->u1_params, hub_u1_del); | |
327 | ||
328 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
329 | hub, &udev->parent->u2_params, hub_u2_del); | |
330 | ||
331 | /* | |
332 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
333 | * when the parent hub notices the downstream port is trying to | |
334 | * transition to U0 to when the hub initiates a U0 transition on its | |
335 | * upstream port. The section says the delays are tPort2PortU1EL and | |
336 | * tPort2PortU2EL, but it doesn't define what they are. | |
337 | * | |
338 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
339 | * about the same delays. Use the maximum delay calculations from those | |
340 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
341 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
342 | * assume the device exit latencies they are talking about are the hub | |
343 | * exit latencies. | |
344 | * | |
345 | * What do we do if the U2 exit latency is less than the U1 exit | |
346 | * latency? It's possible, although not likely... | |
347 | */ | |
348 | port_to_port_delay = 1; | |
349 | ||
350 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
351 | hub, &udev->parent->u1_params, hub_u1_del, | |
352 | port_to_port_delay); | |
353 | ||
354 | if (hub_u2_del > hub_u1_del) | |
355 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
356 | else | |
357 | port_to_port_delay = 1 + hub_u1_del; | |
358 | ||
359 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
360 | hub, &udev->parent->u2_params, hub_u2_del, | |
361 | port_to_port_delay); | |
362 | ||
363 | /* Now that we've got PEL, calculate SEL. */ | |
364 | usb_set_lpm_sel(udev, &udev->u1_params); | |
365 | usb_set_lpm_sel(udev, &udev->u2_params); | |
366 | } | |
367 | ||
1da177e4 | 368 | /* USB 2.0 spec Section 11.24.4.5 */ |
bec444cd JH |
369 | static int get_hub_descriptor(struct usb_device *hdev, |
370 | struct usb_hub_descriptor *desc) | |
1da177e4 | 371 | { |
dbe79bbe JY |
372 | int i, ret, size; |
373 | unsigned dtype; | |
374 | ||
375 | if (hub_is_superspeed(hdev)) { | |
376 | dtype = USB_DT_SS_HUB; | |
377 | size = USB_DT_SS_HUB_SIZE; | |
378 | } else { | |
379 | dtype = USB_DT_HUB; | |
380 | size = sizeof(struct usb_hub_descriptor); | |
381 | } | |
1da177e4 LT |
382 | |
383 | for (i = 0; i < 3; i++) { | |
384 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
385 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
bec444cd | 386 | dtype << 8, 0, desc, size, |
1da177e4 | 387 | USB_CTRL_GET_TIMEOUT); |
2c25a2c8 JH |
388 | if (hub_is_superspeed(hdev)) { |
389 | if (ret == size) | |
390 | return ret; | |
bec444cd JH |
391 | } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { |
392 | /* Make sure we have the DeviceRemovable field. */ | |
393 | size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; | |
394 | if (ret < size) | |
395 | return -EMSGSIZE; | |
1da177e4 | 396 | return ret; |
2c25a2c8 | 397 | } |
1da177e4 LT |
398 | } |
399 | return -EINVAL; | |
400 | } | |
401 | ||
402 | /* | |
403 | * USB 2.0 spec Section 11.24.2.1 | |
404 | */ | |
405 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
406 | { | |
407 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
408 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
409 | } | |
410 | ||
411 | /* | |
412 | * USB 2.0 spec Section 11.24.2.2 | |
413 | */ | |
ad493e5e | 414 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
415 | { |
416 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
417 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
418 | NULL, 0, 1000); | |
419 | } | |
420 | ||
421 | /* | |
422 | * USB 2.0 spec Section 11.24.2.13 | |
423 | */ | |
424 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
425 | { | |
426 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
427 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
428 | NULL, 0, 1000); | |
429 | } | |
430 | ||
d99f6b41 DW |
431 | static char *to_led_name(int selector) |
432 | { | |
433 | switch (selector) { | |
434 | case HUB_LED_AMBER: | |
435 | return "amber"; | |
436 | case HUB_LED_GREEN: | |
437 | return "green"; | |
438 | case HUB_LED_OFF: | |
439 | return "off"; | |
440 | case HUB_LED_AUTO: | |
441 | return "auto"; | |
442 | default: | |
443 | return "??"; | |
444 | } | |
445 | } | |
446 | ||
1da177e4 LT |
447 | /* |
448 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
449 | * for info about using port indicators | |
450 | */ | |
d99f6b41 | 451 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
1da177e4 | 452 | { |
d99f6b41 DW |
453 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
454 | int status; | |
455 | ||
456 | status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
1da177e4 | 457 | USB_PORT_FEAT_INDICATOR); |
d99f6b41 DW |
458 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
459 | to_led_name(selector), status); | |
1da177e4 LT |
460 | } |
461 | ||
462 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
463 | ||
166b8639 | 464 | static void led_work(struct work_struct *work) |
1da177e4 | 465 | { |
c4028958 DH |
466 | struct usb_hub *hub = |
467 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
468 | struct usb_device *hdev = hub->hdev; |
469 | unsigned i; | |
470 | unsigned changed = 0; | |
471 | int cursor = -1; | |
472 | ||
473 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
474 | return; | |
475 | ||
3bbc47d8 | 476 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
477 | unsigned selector, mode; |
478 | ||
479 | /* 30%-50% duty cycle */ | |
480 | ||
481 | switch (hub->indicator[i]) { | |
482 | /* cycle marker */ | |
483 | case INDICATOR_CYCLE: | |
484 | cursor = i; | |
485 | selector = HUB_LED_AUTO; | |
486 | mode = INDICATOR_AUTO; | |
487 | break; | |
488 | /* blinking green = sw attention */ | |
489 | case INDICATOR_GREEN_BLINK: | |
490 | selector = HUB_LED_GREEN; | |
491 | mode = INDICATOR_GREEN_BLINK_OFF; | |
492 | break; | |
493 | case INDICATOR_GREEN_BLINK_OFF: | |
494 | selector = HUB_LED_OFF; | |
495 | mode = INDICATOR_GREEN_BLINK; | |
496 | break; | |
497 | /* blinking amber = hw attention */ | |
498 | case INDICATOR_AMBER_BLINK: | |
499 | selector = HUB_LED_AMBER; | |
500 | mode = INDICATOR_AMBER_BLINK_OFF; | |
501 | break; | |
502 | case INDICATOR_AMBER_BLINK_OFF: | |
503 | selector = HUB_LED_OFF; | |
504 | mode = INDICATOR_AMBER_BLINK; | |
505 | break; | |
506 | /* blink green/amber = reserved */ | |
507 | case INDICATOR_ALT_BLINK: | |
508 | selector = HUB_LED_GREEN; | |
509 | mode = INDICATOR_ALT_BLINK_OFF; | |
510 | break; | |
511 | case INDICATOR_ALT_BLINK_OFF: | |
512 | selector = HUB_LED_AMBER; | |
513 | mode = INDICATOR_ALT_BLINK; | |
514 | break; | |
515 | default: | |
516 | continue; | |
517 | } | |
518 | if (selector != HUB_LED_AUTO) | |
519 | changed = 1; | |
520 | set_port_led(hub, i + 1, selector); | |
521 | hub->indicator[i] = mode; | |
522 | } | |
523 | if (!changed && blinkenlights) { | |
524 | cursor++; | |
3bbc47d8 | 525 | cursor %= hdev->maxchild; |
1da177e4 LT |
526 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
527 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
528 | changed++; | |
529 | } | |
530 | if (changed) | |
22f6a0f0 SD |
531 | queue_delayed_work(system_power_efficient_wq, |
532 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* use a short timeout for hub/port status fetches */ | |
536 | #define USB_STS_TIMEOUT 1000 | |
537 | #define USB_STS_RETRIES 5 | |
538 | ||
539 | /* | |
540 | * USB 2.0 spec Section 11.24.2.6 | |
541 | */ | |
542 | static int get_hub_status(struct usb_device *hdev, | |
543 | struct usb_hub_status *data) | |
544 | { | |
545 | int i, status = -ETIMEDOUT; | |
546 | ||
3824c1dd LP |
547 | for (i = 0; i < USB_STS_RETRIES && |
548 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
549 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
550 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
551 | data, sizeof(*data), USB_STS_TIMEOUT); | |
552 | } | |
553 | return status; | |
554 | } | |
555 | ||
556 | /* | |
557 | * USB 2.0 spec Section 11.24.2.7 | |
0cdd49a1 | 558 | * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 |
1da177e4 LT |
559 | */ |
560 | static int get_port_status(struct usb_device *hdev, int port1, | |
0cdd49a1 | 561 | void *data, u16 value, u16 length) |
1da177e4 LT |
562 | { |
563 | int i, status = -ETIMEDOUT; | |
564 | ||
3824c1dd LP |
565 | for (i = 0; i < USB_STS_RETRIES && |
566 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 | 567 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
0cdd49a1 MN |
568 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, |
569 | port1, data, length, USB_STS_TIMEOUT); | |
1da177e4 LT |
570 | } |
571 | return status; | |
572 | } | |
573 | ||
0cdd49a1 MN |
574 | static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, |
575 | u16 *status, u16 *change, u32 *ext_status) | |
3eb14915 AS |
576 | { |
577 | int ret; | |
0cdd49a1 MN |
578 | int len = 4; |
579 | ||
580 | if (type != HUB_PORT_STATUS) | |
581 | len = 8; | |
3eb14915 AS |
582 | |
583 | mutex_lock(&hub->status_mutex); | |
0cdd49a1 MN |
584 | ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); |
585 | if (ret < len) { | |
e9e88fb7 AS |
586 | if (ret != -ENODEV) |
587 | dev_err(hub->intfdev, | |
588 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
589 | if (ret >= 0) |
590 | ret = -EIO; | |
591 | } else { | |
592 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
593 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
0cdd49a1 MN |
594 | if (type != HUB_PORT_STATUS && ext_status) |
595 | *ext_status = le32_to_cpu( | |
596 | hub->status->port.dwExtPortStatus); | |
3eb14915 AS |
597 | ret = 0; |
598 | } | |
599 | mutex_unlock(&hub->status_mutex); | |
600 | return ret; | |
601 | } | |
602 | ||
0cdd49a1 MN |
603 | static int hub_port_status(struct usb_hub *hub, int port1, |
604 | u16 *status, u16 *change) | |
605 | { | |
606 | return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, | |
607 | status, change, NULL); | |
608 | } | |
609 | ||
32a69589 | 610 | static void kick_hub_wq(struct usb_hub *hub) |
1da177e4 | 611 | { |
32a69589 | 612 | struct usb_interface *intf; |
1da177e4 | 613 | |
32a69589 PM |
614 | if (hub->disconnected || work_pending(&hub->events)) |
615 | return; | |
8e4ceb38 | 616 | |
32a69589 PM |
617 | /* |
618 | * Suppress autosuspend until the event is proceed. | |
619 | * | |
620 | * Be careful and make sure that the symmetric operation is | |
621 | * always called. We are here only when there is no pending | |
622 | * work for this hub. Therefore put the interface either when | |
623 | * the new work is called or when it is canceled. | |
624 | */ | |
625 | intf = to_usb_interface(hub->intfdev); | |
626 | usb_autopm_get_interface_no_resume(intf); | |
627 | kref_get(&hub->kref); | |
628 | ||
629 | if (queue_work(hub_wq, &hub->events)) | |
630 | return; | |
631 | ||
632 | /* the work has already been scheduled */ | |
633 | usb_autopm_put_interface_async(intf); | |
634 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
635 | } |
636 | ||
59d48b3f | 637 | void usb_kick_hub_wq(struct usb_device *hdev) |
1da177e4 | 638 | { |
ad493e5e | 639 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
640 | |
641 | if (hub) | |
32a69589 | 642 | kick_hub_wq(hub); |
1da177e4 LT |
643 | } |
644 | ||
4ee823b8 SS |
645 | /* |
646 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
647 | * Notification, which indicates it had initiated remote wakeup. | |
648 | * | |
649 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
650 | * device initiates resume, so the USB core will not receive notice of the | |
651 | * resume through the normal hub interrupt URB. | |
652 | */ | |
653 | void usb_wakeup_notification(struct usb_device *hdev, | |
654 | unsigned int portnum) | |
655 | { | |
656 | struct usb_hub *hub; | |
83a62c51 | 657 | struct usb_port *port_dev; |
4ee823b8 SS |
658 | |
659 | if (!hdev) | |
660 | return; | |
661 | ||
ad493e5e | 662 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 | 663 | if (hub) { |
83a62c51 RCS |
664 | port_dev = hub->ports[portnum - 1]; |
665 | if (port_dev && port_dev->child) | |
666 | pm_wakeup_event(&port_dev->child->dev, 0); | |
667 | ||
4ee823b8 | 668 | set_bit(portnum, hub->wakeup_bits); |
32a69589 | 669 | kick_hub_wq(hub); |
4ee823b8 SS |
670 | } |
671 | } | |
672 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
673 | |
674 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 675 | static void hub_irq(struct urb *urb) |
1da177e4 | 676 | { |
ec17cf1c | 677 | struct usb_hub *hub = urb->context; |
e015268d | 678 | int status = urb->status; |
71d2718f | 679 | unsigned i; |
1da177e4 LT |
680 | unsigned long bits; |
681 | ||
e015268d | 682 | switch (status) { |
1da177e4 LT |
683 | case -ENOENT: /* synchronous unlink */ |
684 | case -ECONNRESET: /* async unlink */ | |
685 | case -ESHUTDOWN: /* hardware going away */ | |
686 | return; | |
687 | ||
688 | default: /* presumably an error */ | |
689 | /* Cause a hub reset after 10 consecutive errors */ | |
166b8639 | 690 | dev_dbg(hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
691 | if ((++hub->nerrors < 10) || hub->error) |
692 | goto resubmit; | |
e015268d | 693 | hub->error = status; |
1da177e4 | 694 | /* FALL THROUGH */ |
ec17cf1c | 695 | |
37ebb549 | 696 | /* let hub_wq handle things */ |
1da177e4 LT |
697 | case 0: /* we got data: port status changed */ |
698 | bits = 0; | |
699 | for (i = 0; i < urb->actual_length; ++i) | |
700 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
701 | << (i*8); | |
702 | hub->event_bits[0] = bits; | |
703 | break; | |
704 | } | |
705 | ||
706 | hub->nerrors = 0; | |
707 | ||
37ebb549 | 708 | /* Something happened, let hub_wq figure it out */ |
32a69589 | 709 | kick_hub_wq(hub); |
1da177e4 LT |
710 | |
711 | resubmit: | |
712 | if (hub->quiescing) | |
713 | return; | |
714 | ||
088a3dae KB |
715 | status = usb_submit_urb(hub->urb, GFP_ATOMIC); |
716 | if (status != 0 && status != -ENODEV && status != -EPERM) | |
166b8639 | 717 | dev_err(hub->intfdev, "resubmit --> %d\n", status); |
1da177e4 LT |
718 | } |
719 | ||
720 | /* USB 2.0 spec Section 11.24.2.3 */ | |
721 | static inline int | |
166b8639 | 722 | hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) |
1da177e4 | 723 | { |
2c7b871b WG |
724 | /* Need to clear both directions for control ep */ |
725 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
726 | USB_ENDPOINT_XFER_CONTROL) { | |
727 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
728 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
729 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
730 | if (status) | |
731 | return status; | |
732 | } | |
c2f6595f | 733 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
734 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
735 | tt, NULL, 0, 1000); | |
736 | } | |
737 | ||
738 | /* | |
37ebb549 | 739 | * enumeration blocks hub_wq for a long time. we use keventd instead, since |
1da177e4 LT |
740 | * long blocking there is the exception, not the rule. accordingly, HCDs |
741 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
742 | * both can talk to the same hub concurrently. | |
743 | */ | |
cb88a1b8 | 744 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 745 | { |
c4028958 | 746 | struct usb_hub *hub = |
cb88a1b8 | 747 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
748 | unsigned long flags; |
749 | ||
166b8639 | 750 | spin_lock_irqsave(&hub->tt.lock, flags); |
3b6054da | 751 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 752 | struct list_head *next; |
1da177e4 LT |
753 | struct usb_tt_clear *clear; |
754 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 755 | const struct hc_driver *drv; |
1da177e4 LT |
756 | int status; |
757 | ||
d0f830d3 | 758 | next = hub->tt.clear_list.next; |
166b8639 CM |
759 | clear = list_entry(next, struct usb_tt_clear, clear_list); |
760 | list_del(&clear->clear_list); | |
1da177e4 LT |
761 | |
762 | /* drop lock so HCD can concurrently report other TT errors */ | |
166b8639 CM |
763 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
764 | status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 765 | if (status && status != -ENODEV) |
166b8639 | 766 | dev_err(&hdev->dev, |
1da177e4 LT |
767 | "clear tt %d (%04x) error %d\n", |
768 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
769 | |
770 | /* Tell the HCD, even if the operation failed */ | |
771 | drv = clear->hcd->driver; | |
772 | if (drv->clear_tt_buffer_complete) | |
773 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
774 | ||
1bc3c9e1 | 775 | kfree(clear); |
cb88a1b8 | 776 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 | 777 | } |
166b8639 | 778 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
1da177e4 LT |
779 | } |
780 | ||
971fcd49 LT |
781 | /** |
782 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
783 | * @hdev: USB device belonging to the usb hub |
784 | * @hub: target hub | |
971fcd49 LT |
785 | * @port1: port index |
786 | * @set: expected status | |
787 | * | |
788 | * call this function to control port's power via setting or | |
789 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
790 | * |
791 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 792 | */ |
41341261 MN |
793 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
794 | int port1, bool set) | |
971fcd49 LT |
795 | { |
796 | int ret; | |
797 | ||
798 | if (set) | |
799 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
800 | else | |
ad493e5e LT |
801 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
802 | ||
d5c3834e DW |
803 | if (ret) |
804 | return ret; | |
805 | ||
806 | if (set) | |
807 | set_bit(port1, hub->power_bits); | |
808 | else | |
809 | clear_bit(port1, hub->power_bits); | |
810 | return 0; | |
971fcd49 LT |
811 | } |
812 | ||
1da177e4 | 813 | /** |
cb88a1b8 AS |
814 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
815 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
816 | * |
817 | * High speed HCDs use this to tell the hub driver that some split control or | |
818 | * bulk transaction failed in a way that requires clearing internal state of | |
819 | * a transaction translator. This is normally detected (and reported) from | |
820 | * interrupt context. | |
821 | * | |
822 | * It may not be possible for that hub to handle additional full (or low) | |
823 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
824 | * |
825 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 826 | */ |
cb88a1b8 | 827 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 828 | { |
cb88a1b8 AS |
829 | struct usb_device *udev = urb->dev; |
830 | int pipe = urb->pipe; | |
1da177e4 LT |
831 | struct usb_tt *tt = udev->tt; |
832 | unsigned long flags; | |
833 | struct usb_tt_clear *clear; | |
834 | ||
835 | /* we've got to cope with an arbitrary number of pending TT clears, | |
836 | * since each TT has "at least two" buffers that can need it (and | |
837 | * there can be many TTs per hub). even if they're uncommon. | |
838 | */ | |
d544d273 GKH |
839 | clear = kmalloc(sizeof *clear, GFP_ATOMIC); |
840 | if (clear == NULL) { | |
166b8639 | 841 | dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
1da177e4 | 842 | /* FIXME recover somehow ... RESET_TT? */ |
cb88a1b8 | 843 | return -ENOMEM; |
1da177e4 LT |
844 | } |
845 | ||
846 | /* info that CLEAR_TT_BUFFER needs */ | |
847 | clear->tt = tt->multi ? udev->ttport : 1; | |
848 | clear->devinfo = usb_pipeendpoint (pipe); | |
849 | clear->devinfo |= udev->devnum << 4; | |
166b8639 | 850 | clear->devinfo |= usb_pipecontrol(pipe) |
1da177e4 LT |
851 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
852 | : (USB_ENDPOINT_XFER_BULK << 11); | |
166b8639 | 853 | if (usb_pipein(pipe)) |
1da177e4 | 854 | clear->devinfo |= 1 << 15; |
cb88a1b8 AS |
855 | |
856 | /* info for completion callback */ | |
857 | clear->hcd = bus_to_hcd(udev->bus); | |
858 | clear->ep = urb->ep; | |
859 | ||
1da177e4 | 860 | /* tell keventd to clear state for this TT */ |
166b8639 CM |
861 | spin_lock_irqsave(&tt->lock, flags); |
862 | list_add_tail(&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 863 | schedule_work(&tt->clear_work); |
166b8639 | 864 | spin_unlock_irqrestore(&tt->lock, flags); |
cb88a1b8 | 865 | return 0; |
1da177e4 | 866 | } |
cb88a1b8 | 867 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 868 | |
7ad3c470 | 869 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
1da177e4 LT |
870 | { |
871 | int port1; | |
4489a571 AS |
872 | |
873 | /* Enable power on each port. Some hubs have reserved values | |
874 | * of LPSM (> 2) in their descriptors, even though they are | |
875 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
876 | * but only emulate it. In all cases, the ports won't work | |
877 | * unless we send these messages to the hub. | |
878 | */ | |
9262c19d | 879 | if (hub_is_port_power_switchable(hub)) |
1da177e4 | 880 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
881 | else |
882 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
883 | "non-switchable hub\n"); | |
3bbc47d8 | 884 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
d5c3834e | 885 | if (test_bit(port1, hub->power_bits)) |
ad493e5e LT |
886 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
887 | else | |
888 | usb_clear_port_feature(hub->hdev, port1, | |
889 | USB_PORT_FEAT_POWER); | |
8520f380 | 890 | if (do_delay) |
7ad3c470 | 891 | msleep(hub_power_on_good_delay(hub)); |
1da177e4 LT |
892 | } |
893 | ||
1da177e4 LT |
894 | static int hub_hub_status(struct usb_hub *hub, |
895 | u16 *status, u16 *change) | |
896 | { | |
897 | int ret; | |
898 | ||
db90e7a1 | 899 | mutex_lock(&hub->status_mutex); |
1da177e4 | 900 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
901 | if (ret < 0) { |
902 | if (ret != -ENODEV) | |
903 | dev_err(hub->intfdev, | |
904 | "%s failed (err = %d)\n", __func__, ret); | |
905 | } else { | |
1da177e4 | 906 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 907 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
908 | ret = 0; |
909 | } | |
db90e7a1 | 910 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
911 | return ret; |
912 | } | |
913 | ||
41e7e056 SS |
914 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
915 | unsigned int link_status) | |
916 | { | |
917 | return set_port_feature(hub->hdev, | |
918 | port1 | (link_status << 3), | |
919 | USB_PORT_FEAT_LINK_STATE); | |
920 | } | |
921 | ||
0458d5b4 | 922 | /* |
6d42fcdb | 923 | * Disable a port and mark a logical connect-change event, so that some |
37ebb549 | 924 | * time later hub_wq will disconnect() any existing usb_device on the port |
0458d5b4 AS |
925 | * and will re-enumerate if there actually is a device attached. |
926 | */ | |
927 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
928 | { | |
d99f6b41 | 929 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
0458d5b4 | 930 | hub_port_disable(hub, port1, 1); |
7d069b7d | 931 | |
0458d5b4 AS |
932 | /* FIXME let caller ask to power down the port: |
933 | * - some devices won't enumerate without a VBUS power cycle | |
934 | * - SRP saves power that way | |
935 | * - ... new call, TBD ... | |
936 | * That's easy if this hub can switch power per-port, and | |
37ebb549 | 937 | * hub_wq reactivates the port later (timer, SRP, etc). |
0458d5b4 AS |
938 | * Powerdown must be optional, because of reset/DFU. |
939 | */ | |
940 | ||
941 | set_bit(port1, hub->change_bits); | |
32a69589 | 942 | kick_hub_wq(hub); |
0458d5b4 AS |
943 | } |
944 | ||
253e0572 AS |
945 | /** |
946 | * usb_remove_device - disable a device's port on its parent hub | |
947 | * @udev: device to be disabled and removed | |
948 | * Context: @udev locked, must be able to sleep. | |
949 | * | |
37ebb549 | 950 | * After @udev's port has been disabled, hub_wq is notified and it will |
253e0572 AS |
951 | * see that the device has been disconnected. When the device is |
952 | * physically unplugged and something is plugged in, the events will | |
953 | * be received and processed normally. | |
626f090c YB |
954 | * |
955 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
956 | */ |
957 | int usb_remove_device(struct usb_device *udev) | |
958 | { | |
959 | struct usb_hub *hub; | |
960 | struct usb_interface *intf; | |
961 | ||
962 | if (!udev->parent) /* Can't remove a root hub */ | |
963 | return -EINVAL; | |
ad493e5e | 964 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
965 | intf = to_usb_interface(hub->intfdev); |
966 | ||
967 | usb_autopm_get_interface(intf); | |
968 | set_bit(udev->portnum, hub->removed_bits); | |
969 | hub_port_logical_disconnect(hub, udev->portnum); | |
970 | usb_autopm_put_interface(intf); | |
971 | return 0; | |
972 | } | |
973 | ||
6ee0b270 | 974 | enum hub_activation_type { |
8e4ceb38 | 975 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 976 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 977 | }; |
5e6effae | 978 | |
8520f380 AS |
979 | static void hub_init_func2(struct work_struct *ws); |
980 | static void hub_init_func3(struct work_struct *ws); | |
981 | ||
f2835219 | 982 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
983 | { |
984 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
985 | struct usb_hcd *hcd; |
986 | int ret; | |
5e6effae | 987 | int port1; |
f2835219 | 988 | int status; |
948fea37 | 989 | bool need_debounce_delay = false; |
8520f380 AS |
990 | unsigned delay; |
991 | ||
992 | /* Continue a partial initialization */ | |
e50293ef | 993 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
07d316a2 | 994 | device_lock(&hdev->dev); |
e50293ef AS |
995 | |
996 | /* Was the hub disconnected while we were waiting? */ | |
ca5cbc8b AS |
997 | if (hub->disconnected) |
998 | goto disconnected; | |
e50293ef AS |
999 | if (type == HUB_INIT2) |
1000 | goto init2; | |
8520f380 | 1001 | goto init3; |
e50293ef AS |
1002 | } |
1003 | kref_get(&hub->kref); | |
5e6effae | 1004 | |
a45aa3b3 EF |
1005 | /* The superspeed hub except for root hub has to use Hub Depth |
1006 | * value as an offset into the route string to locate the bits | |
1007 | * it uses to determine the downstream port number. So hub driver | |
1008 | * should send a set hub depth request to superspeed hub after | |
1009 | * the superspeed hub is set configuration in initialization or | |
1010 | * reset procedure. | |
1011 | * | |
1012 | * After a resume, port power should still be on. | |
f2835219 AS |
1013 | * For any other type of activation, turn it on. |
1014 | */ | |
8520f380 | 1015 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1016 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1017 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1018 | HUB_SET_DEPTH, USB_RT_HUB, | |
1019 | hdev->level - 1, 0, NULL, 0, | |
1020 | USB_CTRL_SET_TIMEOUT); | |
1021 | if (ret < 0) | |
1022 | dev_err(hub->intfdev, | |
1023 | "set hub depth failed\n"); | |
1024 | } | |
8520f380 AS |
1025 | |
1026 | /* Speed up system boot by using a delayed_work for the | |
1027 | * hub's initial power-up delays. This is pretty awkward | |
1028 | * and the implementation looks like a home-brewed sort of | |
1029 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1030 | * root hub (assuming usbcore is compiled into the kernel | |
1031 | * rather than as a module). It adds up. | |
1032 | * | |
1033 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1034 | * because for those activation types the ports have to be | |
1035 | * operational when we return. In theory this could be done | |
1036 | * for HUB_POST_RESET, but it's easier not to. | |
1037 | */ | |
1038 | if (type == HUB_INIT) { | |
17a364e2 | 1039 | delay = hub_power_on_good_delay(hub); |
7ad3c470 DW |
1040 | |
1041 | hub_power_on(hub, false); | |
77fa83cf | 1042 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
22f6a0f0 SD |
1043 | queue_delayed_work(system_power_efficient_wq, |
1044 | &hub->init_work, | |
8520f380 | 1045 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1046 | |
1047 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1048 | usb_autopm_get_interface_no_resume( |
1049 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1050 | return; /* Continues at init2: below */ |
653a39d1 SS |
1051 | } else if (type == HUB_RESET_RESUME) { |
1052 | /* The internal host controller state for the hub device | |
1053 | * may be gone after a host power loss on system resume. | |
1054 | * Update the device's info so the HW knows it's a hub. | |
1055 | */ | |
1056 | hcd = bus_to_hcd(hdev->bus); | |
1057 | if (hcd->driver->update_hub_device) { | |
1058 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1059 | &hub->tt, GFP_NOIO); | |
1060 | if (ret < 0) { | |
1ccc417e JP |
1061 | dev_err(hub->intfdev, |
1062 | "Host not accepting hub info update\n"); | |
1063 | dev_err(hub->intfdev, | |
1064 | "LS/FS devices and hubs may not work under this hub\n"); | |
653a39d1 SS |
1065 | } |
1066 | } | |
1067 | hub_power_on(hub, true); | |
8520f380 AS |
1068 | } else { |
1069 | hub_power_on(hub, true); | |
1070 | } | |
1071 | } | |
1072 | init2: | |
f2835219 | 1073 | |
d99f6b41 | 1074 | /* |
37ebb549 | 1075 | * Check each port and set hub->change_bits to let hub_wq know |
6ee0b270 | 1076 | * which ports need attention. |
5e6effae AS |
1077 | */ |
1078 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
1079 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1080 | struct usb_device *udev = port_dev->child; | |
5e6effae AS |
1081 | u16 portstatus, portchange; |
1082 | ||
6ee0b270 AS |
1083 | portstatus = portchange = 0; |
1084 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
245b2eec GR |
1085 | if (status) |
1086 | goto abort; | |
1087 | ||
6ee0b270 | 1088 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
d99f6b41 DW |
1089 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
1090 | portstatus, portchange); | |
6ee0b270 | 1091 | |
d99f6b41 DW |
1092 | /* |
1093 | * After anything other than HUB_RESUME (i.e., initialization | |
6ee0b270 AS |
1094 | * or any sort of reset), every port should be disabled. |
1095 | * Unconnected ports should likewise be disabled (paranoia), | |
1096 | * and so should ports for which we have no usb_device. | |
1097 | */ | |
1098 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1099 | type != HUB_RESUME || | |
1100 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1101 | !udev || | |
1102 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1103 | /* |
1104 | * USB3 protocol ports will automatically transition | |
1105 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1106 | * Do not disable USB3 protocol ports, just pretend |
1107 | * power was lost | |
9f0a6cd3 | 1108 | */ |
fd1ac4cf DW |
1109 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1110 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1111 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1112 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1113 | } |
1114 | ||
948fea37 AS |
1115 | /* Clear status-change flags; we'll debounce later */ |
1116 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1117 | need_debounce_delay = true; | |
ad493e5e | 1118 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1119 | USB_PORT_FEAT_C_CONNECTION); |
1120 | } | |
1121 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1122 | need_debounce_delay = true; | |
ad493e5e | 1123 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1124 | USB_PORT_FEAT_C_ENABLE); |
1125 | } | |
e92aee33 JW |
1126 | if (portchange & USB_PORT_STAT_C_RESET) { |
1127 | need_debounce_delay = true; | |
1128 | usb_clear_port_feature(hub->hdev, port1, | |
1129 | USB_PORT_FEAT_C_RESET); | |
1130 | } | |
79c3dd81 DZ |
1131 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1132 | hub_is_superspeed(hub->hdev)) { | |
1133 | need_debounce_delay = true; | |
ad493e5e | 1134 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1135 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1136 | } | |
253e0572 AS |
1137 | /* We can forget about a "removed" device when there's a |
1138 | * physical disconnect or the connect status changes. | |
1139 | */ | |
1140 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1141 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1142 | clear_bit(port1, hub->removed_bits); | |
1143 | ||
6ee0b270 | 1144 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
37ebb549 | 1145 | /* Tell hub_wq to disconnect the device or |
249a32b7 BL |
1146 | * check for a new connection or over current condition. |
1147 | * Based on USB2.0 Spec Section 11.12.5, | |
1148 | * C_PORT_OVER_CURRENT could be set while | |
1149 | * PORT_OVER_CURRENT is not. So check for any of them. | |
6ee0b270 | 1150 | */ |
08d1dec6 | 1151 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
249a32b7 BL |
1152 | (portstatus & USB_PORT_STAT_OVERCURRENT) || |
1153 | (portchange & USB_PORT_STAT_C_OVERCURRENT)) | |
6ee0b270 AS |
1154 | set_bit(port1, hub->change_bits); |
1155 | ||
1156 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1157 | bool port_resumed = (portstatus & |
1158 | USB_PORT_STAT_LINK_STATE) == | |
1159 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1160 | /* The power session apparently survived the resume. |
1161 | * If there was an overcurrent or suspend change | |
37ebb549 | 1162 | * (i.e., remote wakeup request), have hub_wq |
72937e1e SS |
1163 | * take care of it. Look at the port link state |
1164 | * for USB 3.0 hubs, since they don't have a suspend | |
1165 | * change bit, and they don't set the port link change | |
1166 | * bit on device-initiated resume. | |
6ee0b270 | 1167 | */ |
72937e1e SS |
1168 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1169 | port_resumed)) | |
6ee0b270 | 1170 | set_bit(port1, hub->change_bits); |
5e6effae | 1171 | |
6ee0b270 | 1172 | } else if (udev->persist_enabled) { |
6ee0b270 | 1173 | #ifdef CONFIG_PM |
5e6effae | 1174 | udev->reset_resume = 1; |
6ee0b270 | 1175 | #endif |
ad493e5e LT |
1176 | /* Don't set the change_bits when the device |
1177 | * was powered off. | |
1178 | */ | |
d5c3834e | 1179 | if (test_bit(port1, hub->power_bits)) |
ad493e5e | 1180 | set_bit(port1, hub->change_bits); |
8808f00c | 1181 | |
6ee0b270 | 1182 | } else { |
37ebb549 | 1183 | /* The power session is gone; tell hub_wq */ |
6ee0b270 AS |
1184 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
1185 | set_bit(port1, hub->change_bits); | |
5e6effae | 1186 | } |
5e6effae AS |
1187 | } |
1188 | ||
948fea37 AS |
1189 | /* If no port-status-change flags were set, we don't need any |
1190 | * debouncing. If flags were set we can try to debounce the | |
37ebb549 | 1191 | * ports all at once right now, instead of letting hub_wq do them |
948fea37 AS |
1192 | * one at a time later on. |
1193 | * | |
37ebb549 | 1194 | * If any port-status changes do occur during this delay, hub_wq |
948fea37 AS |
1195 | * will see them later and handle them normally. |
1196 | */ | |
8520f380 AS |
1197 | if (need_debounce_delay) { |
1198 | delay = HUB_DEBOUNCE_STABLE; | |
1199 | ||
1200 | /* Don't do a long sleep inside a workqueue routine */ | |
1201 | if (type == HUB_INIT2) { | |
77fa83cf | 1202 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
22f6a0f0 SD |
1203 | queue_delayed_work(system_power_efficient_wq, |
1204 | &hub->init_work, | |
8520f380 | 1205 | msecs_to_jiffies(delay)); |
07d316a2 | 1206 | device_unlock(&hdev->dev); |
8520f380 AS |
1207 | return; /* Continues at init3: below */ |
1208 | } else { | |
1209 | msleep(delay); | |
1210 | } | |
1211 | } | |
1212 | init3: | |
f2835219 AS |
1213 | hub->quiescing = 0; |
1214 | ||
1215 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1216 | if (status < 0) | |
1217 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1218 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1219 | queue_delayed_work(system_power_efficient_wq, |
1220 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1221 | |
1222 | /* Scan all ports that need attention */ | |
32a69589 | 1223 | kick_hub_wq(hub); |
245b2eec | 1224 | abort: |
ca5cbc8b AS |
1225 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
1226 | /* Allow autosuspend if it was suppressed */ | |
1227 | disconnected: | |
8e4ceb38 | 1228 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
07d316a2 | 1229 | device_unlock(&hdev->dev); |
ca5cbc8b | 1230 | } |
e50293ef AS |
1231 | |
1232 | kref_put(&hub->kref, hub_release); | |
5e6effae AS |
1233 | } |
1234 | ||
8520f380 AS |
1235 | /* Implement the continuations for the delays above */ |
1236 | static void hub_init_func2(struct work_struct *ws) | |
1237 | { | |
1238 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1239 | ||
1240 | hub_activate(hub, HUB_INIT2); | |
1241 | } | |
1242 | ||
1243 | static void hub_init_func3(struct work_struct *ws) | |
1244 | { | |
1245 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1246 | ||
1247 | hub_activate(hub, HUB_INIT3); | |
1248 | } | |
1249 | ||
4330354f AS |
1250 | enum hub_quiescing_type { |
1251 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1252 | }; | |
1253 | ||
1254 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1255 | { | |
1256 | struct usb_device *hdev = hub->hdev; | |
1257 | int i; | |
1258 | ||
37ebb549 | 1259 | /* hub_wq and related activity won't re-trigger */ |
4330354f AS |
1260 | hub->quiescing = 1; |
1261 | ||
1262 | if (type != HUB_SUSPEND) { | |
1263 | /* Disconnect all the children */ | |
1264 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1265 | if (hub->ports[i]->child) |
1266 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1267 | } |
1268 | } | |
1269 | ||
37ebb549 | 1270 | /* Stop hub_wq and related activity */ |
4330354f AS |
1271 | usb_kill_urb(hub->urb); |
1272 | if (hub->has_indicators) | |
1273 | cancel_delayed_work_sync(&hub->leds); | |
1274 | if (hub->tt.hub) | |
036546bf | 1275 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1276 | } |
1277 | ||
600856c2 AS |
1278 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
1279 | { | |
1280 | int i; | |
1281 | ||
1282 | for (i = 0; i < hub->hdev->maxchild; ++i) | |
1283 | pm_runtime_barrier(&hub->ports[i]->dev); | |
1284 | } | |
1285 | ||
3eb14915 AS |
1286 | /* caller has locked the hub device */ |
1287 | static int hub_pre_reset(struct usb_interface *intf) | |
1288 | { | |
1289 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1290 | ||
4330354f | 1291 | hub_quiesce(hub, HUB_PRE_RESET); |
600856c2 AS |
1292 | hub->in_reset = 1; |
1293 | hub_pm_barrier_for_all_ports(hub); | |
f07600cf | 1294 | return 0; |
7d069b7d AS |
1295 | } |
1296 | ||
1297 | /* caller has locked the hub device */ | |
f07600cf | 1298 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1299 | { |
7de18d8b AS |
1300 | struct usb_hub *hub = usb_get_intfdata(intf); |
1301 | ||
600856c2 AS |
1302 | hub->in_reset = 0; |
1303 | hub_pm_barrier_for_all_ports(hub); | |
f2835219 | 1304 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1305 | return 0; |
7d069b7d AS |
1306 | } |
1307 | ||
1da177e4 LT |
1308 | static int hub_configure(struct usb_hub *hub, |
1309 | struct usb_endpoint_descriptor *endpoint) | |
1310 | { | |
b356b7c7 | 1311 | struct usb_hcd *hcd; |
1da177e4 LT |
1312 | struct usb_device *hdev = hub->hdev; |
1313 | struct device *hub_dev = hub->intfdev; | |
1314 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1315 | u16 wHubCharacteristics; |
1da177e4 | 1316 | unsigned int pipe; |
fa2a9566 | 1317 | int maxp, ret, i; |
7cbe5dca | 1318 | char *message = "out of memory"; |
430ee58e SAS |
1319 | unsigned unit_load; |
1320 | unsigned full_load; | |
d8521afe | 1321 | unsigned maxchild; |
1da177e4 | 1322 | |
d697cdda | 1323 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1324 | if (!hub->buffer) { |
1da177e4 LT |
1325 | ret = -ENOMEM; |
1326 | goto fail; | |
1327 | } | |
1328 | ||
1329 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1330 | if (!hub->status) { | |
1da177e4 LT |
1331 | ret = -ENOMEM; |
1332 | goto fail; | |
1333 | } | |
db90e7a1 | 1334 | mutex_init(&hub->status_mutex); |
1da177e4 | 1335 | |
bec444cd | 1336 | hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
1da177e4 | 1337 | if (!hub->descriptor) { |
1da177e4 LT |
1338 | ret = -ENOMEM; |
1339 | goto fail; | |
1340 | } | |
1341 | ||
1342 | /* Request the entire hub descriptor. | |
1343 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
2c25a2c8 | 1344 | * but a (non-SS) hub can/will return fewer bytes here. |
1da177e4 | 1345 | */ |
dbe79bbe | 1346 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1347 | if (ret < 0) { |
1348 | message = "can't read hub descriptor"; | |
1349 | goto fail; | |
93491ced JH |
1350 | } |
1351 | ||
1352 | maxchild = USB_MAXCHILDREN; | |
1353 | if (hub_is_superspeed(hdev)) | |
1354 | maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); | |
1355 | ||
1356 | if (hub->descriptor->bNbrPorts > maxchild) { | |
1da177e4 LT |
1357 | message = "hub has too many ports!"; |
1358 | ret = -ENODEV; | |
1359 | goto fail; | |
769d7368 DL |
1360 | } else if (hub->descriptor->bNbrPorts == 0) { |
1361 | message = "hub doesn't have any ports!"; | |
1362 | ret = -ENODEV; | |
1363 | goto fail; | |
1da177e4 LT |
1364 | } |
1365 | ||
886ee36e FB |
1366 | /* |
1367 | * Accumulate wHubDelay + 40ns for every hub in the tree of devices. | |
1368 | * The resulting value will be used for SetIsochDelay() request. | |
1369 | */ | |
1370 | if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) { | |
1371 | u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay); | |
1372 | ||
1373 | if (hdev->parent) | |
1374 | delay += hdev->parent->hub_delay; | |
1375 | ||
1376 | delay += USB_TP_TRANSMISSION_DELAY; | |
1377 | hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX); | |
1378 | } | |
1379 | ||
d8521afe DW |
1380 | maxchild = hub->descriptor->bNbrPorts; |
1381 | dev_info(hub_dev, "%d port%s detected\n", maxchild, | |
1382 | (maxchild == 1) ? "" : "s"); | |
1da177e4 | 1383 | |
6396bb22 | 1384 | hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL); |
ff823c79 | 1385 | if (!hub->ports) { |
7cbe5dca AS |
1386 | ret = -ENOMEM; |
1387 | goto fail; | |
1388 | } | |
1389 | ||
74ad9bd2 | 1390 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1391 | if (hub_is_superspeed(hdev)) { |
1392 | unit_load = 150; | |
1393 | full_load = 900; | |
1394 | } else { | |
1395 | unit_load = 100; | |
1396 | full_load = 500; | |
1397 | } | |
1da177e4 | 1398 | |
dbe79bbe JY |
1399 | /* FIXME for USB 3.0, skip for now */ |
1400 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1401 | !(hub_is_superspeed(hdev))) { | |
469271f8 | 1402 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 | 1403 | |
d8521afe | 1404 | for (i = 0; i < maxchild; i++) |
dbe79bbe | 1405 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1406 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1407 | ? 'F' : 'R'; | |
d8521afe | 1408 | portstr[maxchild] = 0; |
1da177e4 LT |
1409 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
1410 | } else | |
1411 | dev_dbg(hub_dev, "standalone hub\n"); | |
1412 | ||
74ad9bd2 | 1413 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1414 | case HUB_CHAR_COMMON_LPSM: |
1415 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1416 | break; | |
1417 | case HUB_CHAR_INDV_PORT_LPSM: | |
1418 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1419 | break; | |
1420 | case HUB_CHAR_NO_LPSM: | |
1421 | case HUB_CHAR_LPSM: | |
1422 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1423 | break; | |
1da177e4 LT |
1424 | } |
1425 | ||
74ad9bd2 | 1426 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1427 | case HUB_CHAR_COMMON_OCPM: |
1428 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1429 | break; | |
1430 | case HUB_CHAR_INDV_PORT_OCPM: | |
1431 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1432 | break; | |
1433 | case HUB_CHAR_NO_OCPM: | |
1434 | case HUB_CHAR_OCPM: | |
1435 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1436 | break; | |
1da177e4 LT |
1437 | } |
1438 | ||
17248569 CM |
1439 | spin_lock_init(&hub->tt.lock); |
1440 | INIT_LIST_HEAD(&hub->tt.clear_list); | |
cb88a1b8 | 1441 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1442 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1443 | case USB_HUB_PR_FS: |
1444 | break; | |
1445 | case USB_HUB_PR_HS_SINGLE_TT: | |
1446 | dev_dbg(hub_dev, "Single TT\n"); | |
1447 | hub->tt.hub = hdev; | |
1448 | break; | |
1449 | case USB_HUB_PR_HS_MULTI_TT: | |
1450 | ret = usb_set_interface(hdev, 0, 1); | |
1451 | if (ret == 0) { | |
1452 | dev_dbg(hub_dev, "TT per port\n"); | |
1453 | hub->tt.multi = 1; | |
1454 | } else | |
1455 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1456 | ret); | |
1457 | hub->tt.hub = hdev; | |
1458 | break; | |
1459 | case USB_HUB_PR_SS: | |
1460 | /* USB 3.0 hubs don't have a TT */ | |
1461 | break; | |
1462 | default: | |
1463 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1464 | hdev->descriptor.bDeviceProtocol); | |
1465 | break; | |
1da177e4 LT |
1466 | } |
1467 | ||
e09711ae | 1468 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1469 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1470 | case HUB_TTTT_8_BITS: |
1471 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1472 | hub->tt.think_time = 666; | |
e09711ae | 1473 | dev_dbg(hub_dev, "TT requires at most %d " |
1474 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1475 | 8, hub->tt.think_time); |
1476 | } | |
1477 | break; | |
1478 | case HUB_TTTT_16_BITS: | |
1479 | hub->tt.think_time = 666 * 2; | |
1480 | dev_dbg(hub_dev, "TT requires at most %d " | |
1481 | "FS bit times (%d ns)\n", | |
1482 | 16, hub->tt.think_time); | |
1483 | break; | |
1484 | case HUB_TTTT_24_BITS: | |
1485 | hub->tt.think_time = 666 * 3; | |
1486 | dev_dbg(hub_dev, "TT requires at most %d " | |
1487 | "FS bit times (%d ns)\n", | |
1488 | 24, hub->tt.think_time); | |
1489 | break; | |
1490 | case HUB_TTTT_32_BITS: | |
1491 | hub->tt.think_time = 666 * 4; | |
1492 | dev_dbg(hub_dev, "TT requires at most %d " | |
1493 | "FS bit times (%d ns)\n", | |
1494 | 32, hub->tt.think_time); | |
1495 | break; | |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1499 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1500 | hub->has_indicators = 1; |
1501 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1502 | } | |
1503 | ||
1504 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1505 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1506 | ||
1507 | /* power budgeting mostly matters with bus-powered hubs, | |
1508 | * and battery-powered root hubs (may provide just 8 mA). | |
1509 | */ | |
d9e1e148 | 1510 | ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
15b7336e | 1511 | if (ret) { |
1da177e4 LT |
1512 | message = "can't get hub status"; |
1513 | goto fail; | |
1514 | } | |
430ee58e | 1515 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1516 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1517 | if (hcd->power_budget > 0) |
1518 | hdev->bus_mA = hcd->power_budget; | |
1519 | else | |
d8521afe | 1520 | hdev->bus_mA = full_load * maxchild; |
430ee58e SAS |
1521 | if (hdev->bus_mA >= full_load) |
1522 | hub->mA_per_port = full_load; | |
55c52718 AS |
1523 | else { |
1524 | hub->mA_per_port = hdev->bus_mA; | |
1525 | hub->limited_power = 1; | |
1526 | } | |
7d35b929 | 1527 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1528 | int remaining = hdev->bus_mA - |
1529 | hub->descriptor->bHubContrCurrent; | |
1530 | ||
1da177e4 LT |
1531 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1532 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1533 | hub->limited_power = 1; |
55c52718 | 1534 | |
d8521afe | 1535 | if (remaining < maxchild * unit_load) |
430ee58e | 1536 | dev_warn(hub_dev, |
55c52718 AS |
1537 | "insufficient power available " |
1538 | "to use all downstream ports\n"); | |
430ee58e SAS |
1539 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1540 | ||
55c52718 AS |
1541 | } else { /* Self-powered external hub */ |
1542 | /* FIXME: What about battery-powered external hubs that | |
1543 | * provide less current per port? */ | |
430ee58e | 1544 | hub->mA_per_port = full_load; |
7d35b929 | 1545 | } |
430ee58e | 1546 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1547 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1548 | hub->mA_per_port); | |
1da177e4 LT |
1549 | |
1550 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1551 | if (ret < 0) { | |
1552 | message = "can't get hub status"; | |
1553 | goto fail; | |
1554 | } | |
1555 | ||
1556 | /* local power status reports aren't always correct */ | |
1557 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1558 | dev_dbg(hub_dev, "local power source is %s\n", | |
1559 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1560 | ? "lost (inactive)" : "good"); | |
1561 | ||
74ad9bd2 | 1562 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1563 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1564 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1565 | ||
88fafff9 | 1566 | /* set up the interrupt endpoint |
1567 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1568 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1569 | * to send more data (and thus cause overflow). For root hubs, | |
1570 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1571 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1572 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1573 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1574 | ||
1575 | if (maxp > sizeof(*hub->buffer)) | |
1576 | maxp = sizeof(*hub->buffer); | |
1577 | ||
1578 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1579 | if (!hub->urb) { | |
1da177e4 LT |
1580 | ret = -ENOMEM; |
1581 | goto fail; | |
1582 | } | |
1583 | ||
1584 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1585 | hub, endpoint->bInterval); | |
1da177e4 LT |
1586 | |
1587 | /* maybe cycle the hub leds */ | |
1588 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1589 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1590 | |
d8521afe DW |
1591 | mutex_lock(&usb_port_peer_mutex); |
1592 | for (i = 0; i < maxchild; i++) { | |
e58547eb KM |
1593 | ret = usb_hub_create_port_device(hub, i + 1); |
1594 | if (ret < 0) { | |
fa2a9566 LT |
1595 | dev_err(hub->intfdev, |
1596 | "couldn't create port%d device.\n", i + 1); | |
d8521afe | 1597 | break; |
e58547eb KM |
1598 | } |
1599 | } | |
d8521afe | 1600 | hdev->maxchild = i; |
e3d10505 DW |
1601 | for (i = 0; i < hdev->maxchild; i++) { |
1602 | struct usb_port *port_dev = hub->ports[i]; | |
1603 | ||
1604 | pm_runtime_put(&port_dev->dev); | |
1605 | } | |
1606 | ||
d8521afe DW |
1607 | mutex_unlock(&usb_port_peer_mutex); |
1608 | if (ret < 0) | |
1609 | goto fail; | |
fa2a9566 | 1610 | |
37ebb549 | 1611 | /* Update the HCD's internal representation of this hub before hub_wq |
e3d95580 DW |
1612 | * starts getting port status changes for devices under the hub. |
1613 | */ | |
1614 | if (hcd->driver->update_hub_device) { | |
1615 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1616 | &hub->tt, GFP_KERNEL); | |
1617 | if (ret < 0) { | |
1618 | message = "can't update HCD hub info"; | |
1619 | goto fail; | |
1620 | } | |
1621 | } | |
1622 | ||
d2123fd9 LT |
1623 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1624 | ||
f2835219 | 1625 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1626 | return 0; |
1627 | ||
1628 | fail: | |
17248569 | 1629 | dev_err(hub_dev, "config failed, %s (err %d)\n", |
1da177e4 LT |
1630 | message, ret); |
1631 | /* hub_disconnect() frees urb and descriptor */ | |
1632 | return ret; | |
1633 | } | |
1634 | ||
e8054854 AS |
1635 | static void hub_release(struct kref *kref) |
1636 | { | |
1637 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1638 | ||
5d14f323 | 1639 | usb_put_dev(hub->hdev); |
e8054854 AS |
1640 | usb_put_intf(to_usb_interface(hub->intfdev)); |
1641 | kfree(hub); | |
1642 | } | |
1643 | ||
1da177e4 LT |
1644 | static unsigned highspeed_hubs; |
1645 | ||
1646 | static void hub_disconnect(struct usb_interface *intf) | |
1647 | { | |
8816230e | 1648 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1649 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1650 | int port1; |
fa2a9566 | 1651 | |
32a69589 PM |
1652 | /* |
1653 | * Stop adding new hub events. We do not want to block here and thus | |
1654 | * will not try to remove any pending work item. | |
1655 | */ | |
e8054854 | 1656 | hub->disconnected = 1; |
1da177e4 | 1657 | |
7de18d8b AS |
1658 | /* Disconnect all children and quiesce the hub */ |
1659 | hub->error = 0; | |
4330354f | 1660 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1661 | |
d8521afe DW |
1662 | mutex_lock(&usb_port_peer_mutex); |
1663 | ||
543d7784 AS |
1664 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1665 | spin_lock_irq(&device_state_lock); | |
1666 | port1 = hdev->maxchild; | |
1667 | hdev->maxchild = 0; | |
1668 | usb_set_intfdata(intf, NULL); | |
1669 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1670 | |
543d7784 AS |
1671 | for (; port1 > 0; --port1) |
1672 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1673 | |
d8521afe DW |
1674 | mutex_unlock(&usb_port_peer_mutex); |
1675 | ||
e8054854 | 1676 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1677 | highspeed_hubs--; |
1678 | ||
1da177e4 | 1679 | usb_free_urb(hub->urb); |
fa2a9566 | 1680 | kfree(hub->ports); |
1bc3c9e1 | 1681 | kfree(hub->descriptor); |
1bc3c9e1 | 1682 | kfree(hub->status); |
d697cdda | 1683 | kfree(hub->buffer); |
1da177e4 | 1684 | |
971fcd49 | 1685 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1686 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1687 | } |
1688 | ||
c94dc34f EK |
1689 | static bool hub_descriptor_is_sane(struct usb_host_interface *desc) |
1690 | { | |
1691 | /* Some hubs have a subclass of 1, which AFAICT according to the */ | |
1692 | /* specs is not defined, but it works */ | |
1693 | if (desc->desc.bInterfaceSubClass != 0 && | |
1694 | desc->desc.bInterfaceSubClass != 1) | |
1695 | return false; | |
1696 | ||
1697 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1698 | if (desc->desc.bNumEndpoints != 1) | |
1699 | return false; | |
1700 | ||
1701 | /* If the first endpoint is not interrupt IN, we'd better punt! */ | |
1702 | if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) | |
1703 | return false; | |
1704 | ||
1705 | return true; | |
1706 | } | |
1707 | ||
1da177e4 LT |
1708 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
1709 | { | |
1710 | struct usb_host_interface *desc; | |
1da177e4 LT |
1711 | struct usb_device *hdev; |
1712 | struct usb_hub *hub; | |
1713 | ||
1714 | desc = intf->cur_altsetting; | |
1715 | hdev = interface_to_usbdev(intf); | |
1716 | ||
596d789a ML |
1717 | /* |
1718 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1719 | * based on the below considerations: | |
1720 | * | |
1721 | * - Unlike other drivers, the hub driver does not rely on the | |
1722 | * autosuspend delay to provide enough time to handle a wakeup | |
1723 | * event, and the submitted status URB is just to check future | |
1724 | * change on hub downstream ports, so it is safe to do it. | |
1725 | * | |
1726 | * - The patch might cause one or more auto supend/resume for | |
1727 | * below very rare devices when they are plugged into hub | |
1728 | * first time: | |
1729 | * | |
1730 | * devices having trouble initializing, and disconnect | |
1731 | * themselves from the bus and then reconnect a second | |
1732 | * or so later | |
1733 | * | |
1734 | * devices just for downloading firmware, and disconnects | |
1735 | * themselves after completing it | |
1736 | * | |
1737 | * For these quite rare devices, their drivers may change the | |
1738 | * autosuspend delay of their parent hub in the probe() to one | |
1739 | * appropriate value to avoid the subtle problem if someone | |
1740 | * does care it. | |
1741 | * | |
1742 | * - The patch may cause one or more auto suspend/resume on | |
1743 | * hub during running 'lsusb', but it is probably too | |
1744 | * infrequent to worry about. | |
1745 | * | |
1746 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1747 | * suspend timer for hub, also may decrease power consumption | |
1748 | * of USB bus. | |
bdd405d2 RQ |
1749 | * |
1750 | * - If user has indicated to prevent autosuspend by passing | |
1751 | * usbcore.autosuspend = -1 then keep autosuspend disabled. | |
596d789a | 1752 | */ |
ceb6c9c8 | 1753 | #ifdef CONFIG_PM |
bdd405d2 RQ |
1754 | if (hdev->dev.power.autosuspend_delay >= 0) |
1755 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
a9ef803d | 1756 | #endif |
596d789a | 1757 | |
8ef42ddd AS |
1758 | /* |
1759 | * Hubs have proper suspend/resume support, except for root hubs | |
1760 | * where the controller driver doesn't have bus_suspend and | |
1761 | * bus_resume methods. | |
1762 | */ | |
1763 | if (hdev->parent) { /* normal device */ | |
1764 | usb_enable_autosuspend(hdev); | |
1765 | } else { /* root hub */ | |
1766 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; | |
1767 | ||
1768 | if (drv->bus_suspend && drv->bus_resume) | |
1769 | usb_enable_autosuspend(hdev); | |
1770 | } | |
088f7fec | 1771 | |
38f3ad5e | 1772 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1773 | dev_err(&intf->dev, |
1774 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1775 | return -E2BIG; |
1776 | } | |
1777 | ||
89ccbdc9 DB |
1778 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1779 | if (hdev->parent) { | |
1780 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1781 | return -ENODEV; | |
1782 | } | |
1783 | #endif | |
1784 | ||
c94dc34f | 1785 | if (!hub_descriptor_is_sane(desc)) { |
17248569 | 1786 | dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); |
1da177e4 LT |
1787 | return -EIO; |
1788 | } | |
1789 | ||
1da177e4 | 1790 | /* We found a hub */ |
17248569 | 1791 | dev_info(&intf->dev, "USB hub found\n"); |
1da177e4 | 1792 | |
0a1ef3b5 | 1793 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
b74e7062 | 1794 | if (!hub) |
1da177e4 | 1795 | return -ENOMEM; |
1da177e4 | 1796 | |
e8054854 | 1797 | kref_init(&hub->kref); |
1da177e4 LT |
1798 | hub->intfdev = &intf->dev; |
1799 | hub->hdev = hdev; | |
c4028958 | 1800 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1801 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
32a69589 | 1802 | INIT_WORK(&hub->events, hub_event); |
e8054854 | 1803 | usb_get_intf(intf); |
5d14f323 | 1804 | usb_get_dev(hdev); |
1da177e4 | 1805 | |
17248569 | 1806 | usb_set_intfdata(intf, hub); |
40f122f3 | 1807 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1808 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1809 | |
1810 | if (hdev->speed == USB_SPEED_HIGH) | |
1811 | highspeed_hubs++; | |
1812 | ||
e6f30dea ML |
1813 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1814 | hub->quirk_check_port_auto_suspend = 1; | |
1815 | ||
c94dc34f | 1816 | if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) |
1da177e4 LT |
1817 | return 0; |
1818 | ||
17248569 | 1819 | hub_disconnect(intf); |
1da177e4 LT |
1820 | return -ENODEV; |
1821 | } | |
1822 | ||
1823 | static int | |
1824 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1825 | { | |
17248569 | 1826 | struct usb_device *hdev = interface_to_usbdev(intf); |
ad493e5e | 1827 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1828 | |
1829 | /* assert ifno == 0 (part of hub spec) */ | |
1830 | switch (code) { | |
1831 | case USBDEVFS_HUB_PORTINFO: { | |
1832 | struct usbdevfs_hub_portinfo *info = user_data; | |
1833 | int i; | |
1834 | ||
1835 | spin_lock_irq(&device_state_lock); | |
1836 | if (hdev->devnum <= 0) | |
1837 | info->nports = 0; | |
1838 | else { | |
1839 | info->nports = hdev->maxchild; | |
1840 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1841 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1842 | info->port[i] = 0; |
1843 | else | |
1844 | info->port[i] = | |
ff823c79 | 1845 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1846 | } |
1847 | } | |
1848 | spin_unlock_irq(&device_state_lock); | |
1849 | ||
1850 | return info->nports + 1; | |
1851 | } | |
1852 | ||
1853 | default: | |
1854 | return -ENOSYS; | |
1855 | } | |
1856 | } | |
1857 | ||
7cbe5dca AS |
1858 | /* |
1859 | * Allow user programs to claim ports on a hub. When a device is attached | |
1860 | * to one of these "claimed" ports, the program will "own" the device. | |
1861 | */ | |
1862 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 1863 | struct usb_dev_state ***ppowner) |
7cbe5dca | 1864 | { |
41341261 MN |
1865 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1866 | ||
7cbe5dca AS |
1867 | if (hdev->state == USB_STATE_NOTATTACHED) |
1868 | return -ENODEV; | |
1869 | if (port1 == 0 || port1 > hdev->maxchild) | |
1870 | return -EINVAL; | |
1871 | ||
41341261 | 1872 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1873 | * will always have maxchild equal to 0. |
1874 | */ | |
41341261 | 1875 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1876 | return 0; |
1877 | } | |
1878 | ||
1879 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 | 1880 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1881 | struct usb_dev_state *owner) |
7cbe5dca AS |
1882 | { |
1883 | int rc; | |
9b6f0c4b | 1884 | struct usb_dev_state **powner; |
7cbe5dca AS |
1885 | |
1886 | rc = find_port_owner(hdev, port1, &powner); | |
1887 | if (rc) | |
1888 | return rc; | |
1889 | if (*powner) | |
1890 | return -EBUSY; | |
1891 | *powner = owner; | |
1892 | return rc; | |
1893 | } | |
6080cd0e | 1894 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
7cbe5dca | 1895 | |
336c5c31 | 1896 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1897 | struct usb_dev_state *owner) |
7cbe5dca AS |
1898 | { |
1899 | int rc; | |
9b6f0c4b | 1900 | struct usb_dev_state **powner; |
7cbe5dca AS |
1901 | |
1902 | rc = find_port_owner(hdev, port1, &powner); | |
1903 | if (rc) | |
1904 | return rc; | |
1905 | if (*powner != owner) | |
1906 | return -ENOENT; | |
1907 | *powner = NULL; | |
1908 | return rc; | |
1909 | } | |
6080cd0e | 1910 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
7cbe5dca | 1911 | |
9b6f0c4b | 1912 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
7cbe5dca | 1913 | { |
ad493e5e | 1914 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1915 | int n; |
7cbe5dca | 1916 | |
fa2a9566 LT |
1917 | for (n = 0; n < hdev->maxchild; n++) { |
1918 | if (hub->ports[n]->port_owner == owner) | |
1919 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1920 | } |
fa2a9566 | 1921 | |
7cbe5dca AS |
1922 | } |
1923 | ||
1924 | /* The caller must hold udev's lock */ | |
1925 | bool usb_device_is_owned(struct usb_device *udev) | |
1926 | { | |
1927 | struct usb_hub *hub; | |
1928 | ||
1929 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1930 | return false; | |
ad493e5e | 1931 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1932 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1933 | } |
1934 | ||
1da177e4 LT |
1935 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1936 | { | |
ad493e5e | 1937 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1938 | int i; |
1939 | ||
1940 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1941 | if (hub->ports[i]->child) |
1942 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1943 | } |
9bbdf1e0 | 1944 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1945 | udev->active_duration -= jiffies; |
1da177e4 LT |
1946 | udev->state = USB_STATE_NOTATTACHED; |
1947 | } | |
1948 | ||
1949 | /** | |
1950 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1951 | * @udev: pointer to device whose state should be changed | |
1952 | * @new_state: new state value to be stored | |
1953 | * | |
1954 | * udev->state is _not_ fully protected by the device lock. Although | |
1955 | * most transitions are made only while holding the lock, the state can | |
1956 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1957 | * is so that devices can be marked as disconnected as soon as possible, | |
1958 | * without having to wait for any semaphores to be released. As a result, | |
1959 | * all changes to any device's state must be protected by the | |
1960 | * device_state_lock spinlock. | |
1961 | * | |
1962 | * Once a device has been added to the device tree, all changes to its state | |
1963 | * should be made using this routine. The state should _not_ be set directly. | |
1964 | * | |
1965 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1966 | * Otherwise udev->state is set to new_state, and if new_state is | |
1967 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1968 | * to USB_STATE_NOTATTACHED. | |
1969 | */ | |
1970 | void usb_set_device_state(struct usb_device *udev, | |
1971 | enum usb_device_state new_state) | |
1972 | { | |
1973 | unsigned long flags; | |
4681b171 | 1974 | int wakeup = -1; |
1da177e4 LT |
1975 | |
1976 | spin_lock_irqsave(&device_state_lock, flags); | |
1977 | if (udev->state == USB_STATE_NOTATTACHED) | |
1978 | ; /* do nothing */ | |
b94dc6b5 | 1979 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1980 | |
1981 | /* root hub wakeup capabilities are managed out-of-band | |
1982 | * and may involve silicon errata ... ignore them here. | |
1983 | */ | |
1984 | if (udev->parent) { | |
645daaab AS |
1985 | if (udev->state == USB_STATE_SUSPENDED |
1986 | || new_state == USB_STATE_SUSPENDED) | |
1987 | ; /* No change to wakeup settings */ | |
1988 | else if (new_state == USB_STATE_CONFIGURED) | |
ddbe1fca LB |
1989 | wakeup = (udev->quirks & |
1990 | USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : | |
1991 | udev->actconfig->desc.bmAttributes & | |
1992 | USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1993 | else |
4681b171 | 1994 | wakeup = 0; |
fb669cc0 | 1995 | } |
15123006 SS |
1996 | if (udev->state == USB_STATE_SUSPENDED && |
1997 | new_state != USB_STATE_SUSPENDED) | |
1998 | udev->active_duration -= jiffies; | |
1999 | else if (new_state == USB_STATE_SUSPENDED && | |
2000 | udev->state != USB_STATE_SUSPENDED) | |
2001 | udev->active_duration += jiffies; | |
645daaab | 2002 | udev->state = new_state; |
b94dc6b5 | 2003 | } else |
1da177e4 LT |
2004 | recursively_mark_NOTATTACHED(udev); |
2005 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
2006 | if (wakeup >= 0) |
2007 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 2008 | } |
6da9c990 | 2009 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 2010 | |
8af548dc | 2011 | /* |
3b29b68b AS |
2012 | * Choose a device number. |
2013 | * | |
2014 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
2015 | * USB-2.0 buses they are also used as device addresses, however on | |
2016 | * USB-3.0 buses the address is assigned by the controller hardware | |
2017 | * and it usually is not the same as the device number. | |
2018 | * | |
8af548dc IPG |
2019 | * WUSB devices are simple: they have no hubs behind, so the mapping |
2020 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
2021 | * life of the device connection logic in | |
2022 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
2023 | * handshake we need to assign a temporary address in the unauthorized | |
2024 | * space. For simplicity we use the first virtual port number found to | |
2025 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
2026 | * and that becomes it's address [X < 128] or its unauthorized address | |
2027 | * [X | 0x80]. | |
2028 | * | |
2029 | * We add 1 as an offset to the one-based USB-stack port number | |
2030 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
2031 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
2032 | * uses always #1 for the root hub of the controller. So USB stack's | |
2033 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
2034 | * |
2035 | * Devices connected under xHCI are not as simple. The host controller | |
2036 | * supports virtualization, so the hardware assigns device addresses and | |
2037 | * the HCD must setup data structures before issuing a set address | |
2038 | * command to the hardware. | |
8af548dc | 2039 | */ |
3b29b68b | 2040 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
2041 | { |
2042 | int devnum; | |
2043 | struct usb_bus *bus = udev->bus; | |
2044 | ||
638139eb | 2045 | /* be safe when more hub events are proceed in parallel */ |
feb26ac3 | 2046 | mutex_lock(&bus->devnum_next_mutex); |
8af548dc IPG |
2047 | if (udev->wusb) { |
2048 | devnum = udev->portnum + 1; | |
2049 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
2050 | } else { | |
2051 | /* Try to allocate the next devnum beginning at | |
2052 | * bus->devnum_next. */ | |
2053 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
2054 | bus->devnum_next); | |
2055 | if (devnum >= 128) | |
2056 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
2057 | 128, 1); | |
469271f8 | 2058 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 2059 | } |
1da177e4 LT |
2060 | if (devnum < 128) { |
2061 | set_bit(devnum, bus->devmap.devicemap); | |
2062 | udev->devnum = devnum; | |
2063 | } | |
feb26ac3 | 2064 | mutex_unlock(&bus->devnum_next_mutex); |
1da177e4 LT |
2065 | } |
2066 | ||
3b29b68b | 2067 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2068 | { |
2069 | if (udev->devnum > 0) { | |
2070 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2071 | udev->devnum = -1; | |
2072 | } | |
2073 | } | |
2074 | ||
3b29b68b | 2075 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2076 | { |
2077 | /* The address for a WUSB device is managed by wusbcore. */ | |
2078 | if (!udev->wusb) | |
2079 | udev->devnum = devnum; | |
2080 | } | |
2081 | ||
f7410ced HX |
2082 | static void hub_free_dev(struct usb_device *udev) |
2083 | { | |
2084 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2085 | ||
2086 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2087 | if (hcd->driver->free_dev && udev->parent) | |
2088 | hcd->driver->free_dev(hcd, udev); | |
2089 | } | |
2090 | ||
7027df36 DW |
2091 | static void hub_disconnect_children(struct usb_device *udev) |
2092 | { | |
2093 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2094 | int i; | |
2095 | ||
2096 | /* Free up all the children before we remove this device */ | |
2097 | for (i = 0; i < udev->maxchild; i++) { | |
2098 | if (hub->ports[i]->child) | |
2099 | usb_disconnect(&hub->ports[i]->child); | |
2100 | } | |
2101 | } | |
2102 | ||
1da177e4 LT |
2103 | /** |
2104 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2105 | * @pdev: pointer to device being disconnected | |
2106 | * Context: !in_interrupt () | |
2107 | * | |
2108 | * Something got disconnected. Get rid of it and all of its children. | |
2109 | * | |
2110 | * If *pdev is a normal device then the parent hub must already be locked. | |
a4b5d606 | 2111 | * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, |
db8f2aa3 | 2112 | * which protects the set of root hubs as well as the list of buses. |
1da177e4 LT |
2113 | * |
2114 | * Only hub drivers (including virtual root hub drivers for host | |
2115 | * controllers) should ever call this. | |
2116 | * | |
2117 | * This call is synchronous, and may not be used in an interrupt context. | |
2118 | */ | |
2119 | void usb_disconnect(struct usb_device **pdev) | |
2120 | { | |
7027df36 DW |
2121 | struct usb_port *port_dev = NULL; |
2122 | struct usb_device *udev = *pdev; | |
5b1dc209 PC |
2123 | struct usb_hub *hub = NULL; |
2124 | int port1 = 1; | |
1da177e4 | 2125 | |
1da177e4 LT |
2126 | /* mark the device as inactive, so any further urb submissions for |
2127 | * this device (and any of its children) will fail immediately. | |
25985edc | 2128 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2129 | */ |
2130 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2131 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2132 | udev->devnum); | |
1da177e4 | 2133 | |
f5cccf49 GR |
2134 | /* |
2135 | * Ensure that the pm runtime code knows that the USB device | |
2136 | * is in the process of being disconnected. | |
2137 | */ | |
2138 | pm_runtime_barrier(&udev->dev); | |
2139 | ||
9ad3d6cc AS |
2140 | usb_lock_device(udev); |
2141 | ||
7027df36 | 2142 | hub_disconnect_children(udev); |
1da177e4 LT |
2143 | |
2144 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2145 | * cleaning up all state associated with the current configuration | |
2146 | * so that the hardware is now fully quiesced. | |
2147 | */ | |
17248569 | 2148 | dev_dbg(&udev->dev, "unregistering device\n"); |
1da177e4 | 2149 | usb_disable_device(udev, 0); |
cde217a5 | 2150 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2151 | |
fde26380 | 2152 | if (udev->parent) { |
7027df36 DW |
2153 | port1 = udev->portnum; |
2154 | hub = usb_hub_to_struct_hub(udev->parent); | |
2155 | port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2156 | |
2157 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2158 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2159 | |
7027df36 DW |
2160 | /* |
2161 | * As usb_port_runtime_resume() de-references udev, make | |
2162 | * sure no resumes occur during removal | |
2163 | */ | |
2164 | if (!test_and_set_bit(port1, hub->child_usage_bits)) | |
2165 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2166 | } |
2167 | ||
3b23dd6f | 2168 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2169 | usb_unlock_device(udev); |
2170 | ||
2171 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2172 | * for de-configuring the device and invoking the remove-device |
2173 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2174 | */ |
2175 | device_del(&udev->dev); | |
3099e75a | 2176 | |
782da727 | 2177 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2178 | * (or root_hub) pointer. |
2179 | */ | |
3b29b68b | 2180 | release_devnum(udev); |
1da177e4 LT |
2181 | |
2182 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2183 | spin_lock_irq(&device_state_lock); | |
2184 | *pdev = NULL; | |
2185 | spin_unlock_irq(&device_state_lock); | |
2186 | ||
7027df36 DW |
2187 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
2188 | pm_runtime_put(&port_dev->dev); | |
2189 | ||
f7410ced HX |
2190 | hub_free_dev(udev); |
2191 | ||
782da727 | 2192 | put_device(&udev->dev); |
1da177e4 LT |
2193 | } |
2194 | ||
f2a383e4 | 2195 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2196 | static void show_string(struct usb_device *udev, char *id, char *string) |
2197 | { | |
2198 | if (!string) | |
2199 | return; | |
f2ec522e | 2200 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2201 | } |
2202 | ||
f2a383e4 GKH |
2203 | static void announce_device(struct usb_device *udev) |
2204 | { | |
73c6d3b2 BL |
2205 | u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice); |
2206 | ||
2207 | dev_info(&udev->dev, | |
2208 | "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n", | |
f2a383e4 | 2209 | le16_to_cpu(udev->descriptor.idVendor), |
73c6d3b2 BL |
2210 | le16_to_cpu(udev->descriptor.idProduct), |
2211 | bcdDevice >> 8, bcdDevice & 0xff); | |
b9cef6c3 WF |
2212 | dev_info(&udev->dev, |
2213 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2214 | udev->descriptor.iManufacturer, |
2215 | udev->descriptor.iProduct, | |
2216 | udev->descriptor.iSerialNumber); | |
2217 | show_string(udev, "Product", udev->product); | |
2218 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2219 | show_string(udev, "SerialNumber", udev->serial); | |
2220 | } | |
1da177e4 | 2221 | #else |
f2a383e4 | 2222 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2223 | #endif |
2224 | ||
1da177e4 | 2225 | |
3ede760f | 2226 | /** |
8d8558d1 | 2227 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2228 | * @udev: newly addressed device (in ADDRESS state) |
2229 | * | |
8d8558d1 | 2230 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2231 | * |
2232 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2233 | */ |
8d8558d1 | 2234 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2235 | { |
d9d16e8a | 2236 | int err = 0; |
1da177e4 LT |
2237 | |
2238 | #ifdef CONFIG_USB_OTG | |
2239 | /* | |
2240 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2241 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2242 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2243 | */ | |
2244 | if (!udev->bus->is_b_host | |
2245 | && udev->config | |
2246 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2247 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 | 2248 | struct usb_bus *bus = udev->bus; |
7d2d641c | 2249 | unsigned port1 = udev->portnum; |
1da177e4 LT |
2250 | |
2251 | /* descriptor may appear anywhere in config */ | |
7d2d641c LJ |
2252 | err = __usb_get_extra_descriptor(udev->rawdescriptors[0], |
2253 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2254 | USB_DT_OTG, (void **) &desc); | |
2255 | if (err || !(desc->bmAttributes & USB_OTG_HNP)) | |
2256 | return 0; | |
2257 | ||
2258 | dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", | |
2259 | (port1 == bus->otg_port) ? "" : "non-"); | |
2260 | ||
2261 | /* enable HNP before suspend, it's simpler */ | |
2262 | if (port1 == bus->otg_port) { | |
2263 | bus->b_hnp_enable = 1; | |
2264 | err = usb_control_msg(udev, | |
2265 | usb_sndctrlpipe(udev, 0), | |
2266 | USB_REQ_SET_FEATURE, 0, | |
2267 | USB_DEVICE_B_HNP_ENABLE, | |
2268 | 0, NULL, 0, | |
2269 | USB_CTRL_SET_TIMEOUT); | |
2270 | if (err < 0) { | |
2271 | /* | |
2272 | * OTG MESSAGE: report errors here, | |
2273 | * customize to match your product. | |
2274 | */ | |
2275 | dev_err(&udev->dev, "can't set HNP mode: %d\n", | |
2276 | err); | |
2277 | bus->b_hnp_enable = 0; | |
1da177e4 | 2278 | } |
7d2d641c LJ |
2279 | } else if (desc->bLength == sizeof |
2280 | (struct usb_otg_descriptor)) { | |
2281 | /* Set a_alt_hnp_support for legacy otg device */ | |
2282 | err = usb_control_msg(udev, | |
2283 | usb_sndctrlpipe(udev, 0), | |
2284 | USB_REQ_SET_FEATURE, 0, | |
2285 | USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2286 | 0, NULL, 0, | |
2287 | USB_CTRL_SET_TIMEOUT); | |
2288 | if (err < 0) | |
2289 | dev_err(&udev->dev, | |
2290 | "set a_alt_hnp_support failed: %d\n", | |
2291 | err); | |
1da177e4 LT |
2292 | } |
2293 | } | |
1da177e4 | 2294 | #endif |
d9d16e8a IPG |
2295 | return err; |
2296 | } | |
2297 | ||
2298 | ||
2299 | /** | |
8d8558d1 | 2300 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2301 | * @udev: newly addressed device (in ADDRESS state) |
2302 | * | |
2303 | * This is only called by usb_new_device() and usb_authorize_device() | |
2304 | * and FIXME -- all comments that apply to them apply here wrt to | |
2305 | * environment. | |
2306 | * | |
2307 | * If the device is WUSB and not authorized, we don't attempt to read | |
2308 | * the string descriptors, as they will be errored out by the device | |
2309 | * until it has been authorized. | |
626f090c YB |
2310 | * |
2311 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2312 | */ |
8d8558d1 | 2313 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2314 | { |
2315 | int err; | |
026f3fcb | 2316 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2317 | |
d9d16e8a IPG |
2318 | if (udev->config == NULL) { |
2319 | err = usb_get_configuration(udev); | |
2320 | if (err < 0) { | |
e9e88fb7 AS |
2321 | if (err != -ENODEV) |
2322 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2323 | err); | |
80da2e0d | 2324 | return err; |
d9d16e8a IPG |
2325 | } |
2326 | } | |
83e83ecb TP |
2327 | |
2328 | /* read the standard strings and cache them if present */ | |
2329 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2330 | udev->manufacturer = usb_cache_string(udev, | |
2331 | udev->descriptor.iManufacturer); | |
2332 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2333 | ||
8d8558d1 | 2334 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2335 | if (err < 0) |
2336 | return err; | |
2337 | ||
026f3fcb | 2338 | if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && |
e5a9d621 | 2339 | !is_targeted(udev)) { |
026f3fcb PC |
2340 | /* Maybe it can talk to us, though we can't talk to it. |
2341 | * (Includes HNP test device.) | |
2342 | */ | |
e5a9d621 PC |
2343 | if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable |
2344 | || udev->bus->is_b_host)) { | |
026f3fcb PC |
2345 | err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); |
2346 | if (err < 0) | |
2347 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2348 | } | |
2349 | return -ENOTSUPP; | |
2350 | } | |
2351 | ||
80da2e0d LP |
2352 | usb_detect_interface_quirks(udev); |
2353 | ||
2354 | return 0; | |
d9d16e8a IPG |
2355 | } |
2356 | ||
d35e70d5 MG |
2357 | static void set_usb_port_removable(struct usb_device *udev) |
2358 | { | |
2359 | struct usb_device *hdev = udev->parent; | |
2360 | struct usb_hub *hub; | |
2361 | u8 port = udev->portnum; | |
2362 | u16 wHubCharacteristics; | |
2363 | bool removable = true; | |
2364 | ||
2365 | if (!hdev) | |
2366 | return; | |
2367 | ||
ad493e5e | 2368 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 | 2369 | |
92bfbf71 MG |
2370 | /* |
2371 | * If the platform firmware has provided information about a port, | |
2372 | * use that to determine whether it's removable. | |
2373 | */ | |
2374 | switch (hub->ports[udev->portnum - 1]->connect_type) { | |
2375 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: | |
2376 | udev->removable = USB_DEVICE_REMOVABLE; | |
2377 | return; | |
2378 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
58339c2e | 2379 | case USB_PORT_NOT_USED: |
92bfbf71 MG |
2380 | udev->removable = USB_DEVICE_FIXED; |
2381 | return; | |
58339c2e MG |
2382 | default: |
2383 | break; | |
92bfbf71 MG |
2384 | } |
2385 | ||
2386 | /* | |
2387 | * Otherwise, check whether the hub knows whether a port is removable | |
2388 | * or not | |
2389 | */ | |
d35e70d5 MG |
2390 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
2391 | ||
2392 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2393 | return; | |
2394 | ||
2395 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2396 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2397 | & (1 << port)) | |
d35e70d5 MG |
2398 | removable = false; |
2399 | } else { | |
2400 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2401 | removable = false; | |
2402 | } | |
2403 | ||
2404 | if (removable) | |
2405 | udev->removable = USB_DEVICE_REMOVABLE; | |
2406 | else | |
2407 | udev->removable = USB_DEVICE_FIXED; | |
a4204ff0 | 2408 | |
d35e70d5 | 2409 | } |
d9d16e8a IPG |
2410 | |
2411 | /** | |
2412 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2413 | * @udev: newly addressed device (in ADDRESS state) | |
2414 | * | |
8d8558d1 AS |
2415 | * This is called with devices which have been detected but not fully |
2416 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2417 | * for any device configuration. The caller must have locked either |
2418 | * the parent hub (if udev is a normal device) or else the | |
a4b5d606 | 2419 | * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to |
d9d16e8a IPG |
2420 | * udev has already been installed, but udev is not yet visible through |
2421 | * sysfs or other filesystem code. | |
2422 | * | |
d9d16e8a IPG |
2423 | * This call is synchronous, and may not be used in an interrupt context. |
2424 | * | |
2425 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2426 | * |
2427 | * Return: Whether the device is configured properly or not. Zero if the | |
2428 | * interface was registered with the driver core; else a negative errno | |
2429 | * value. | |
2430 | * | |
d9d16e8a IPG |
2431 | */ |
2432 | int usb_new_device(struct usb_device *udev) | |
2433 | { | |
2434 | int err; | |
2435 | ||
16985408 | 2436 | if (udev->parent) { |
16985408 DS |
2437 | /* Initialize non-root-hub device wakeup to disabled; |
2438 | * device (un)configuration controls wakeup capable | |
2439 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2440 | */ | |
2441 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2442 | } |
2443 | ||
9bbdf1e0 AS |
2444 | /* Tell the runtime-PM framework the device is active */ |
2445 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2446 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2447 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2448 | pm_runtime_enable(&udev->dev); |
2449 | ||
c08512c7 AS |
2450 | /* By default, forbid autosuspend for all devices. It will be |
2451 | * allowed for hubs during binding. | |
2452 | */ | |
2453 | usb_disable_autosuspend(udev); | |
2454 | ||
8d8558d1 | 2455 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2456 | if (err < 0) |
2457 | goto fail; | |
c6515272 SS |
2458 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2459 | udev->devnum, udev->bus->busnum, | |
2460 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2461 | /* export the usbdev device-node for libusb */ |
2462 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2463 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2464 | ||
6cd13201 AS |
2465 | /* Tell the world! */ |
2466 | announce_device(udev); | |
195af2cc | 2467 | |
b04b3156 TT |
2468 | if (udev->serial) |
2469 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2470 | if (udev->product) | |
2471 | add_device_randomness(udev->product, strlen(udev->product)); | |
2472 | if (udev->manufacturer) | |
2473 | add_device_randomness(udev->manufacturer, | |
2474 | strlen(udev->manufacturer)); | |
2475 | ||
927bc916 | 2476 | device_enable_async_suspend(&udev->dev); |
d35e70d5 | 2477 | |
a4204ff0 | 2478 | /* check whether the hub or firmware marks this port as non-removable */ |
d35e70d5 MG |
2479 | if (udev->parent) |
2480 | set_usb_port_removable(udev); | |
2481 | ||
782da727 | 2482 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2483 | * for configuring the device and invoking the add-device |
2484 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2485 | */ |
9f8b17e6 | 2486 | err = device_add(&udev->dev); |
1da177e4 LT |
2487 | if (err) { |
2488 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2489 | goto fail; | |
2490 | } | |
9ad3d6cc | 2491 | |
fde26380 LT |
2492 | /* Create link files between child device and usb port device. */ |
2493 | if (udev->parent) { | |
ad493e5e | 2494 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
d5c3834e DW |
2495 | int port1 = udev->portnum; |
2496 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2497 | |
2498 | err = sysfs_create_link(&udev->dev.kobj, | |
2499 | &port_dev->dev.kobj, "port"); | |
2500 | if (err) | |
2501 | goto fail; | |
2502 | ||
2503 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2504 | &udev->dev.kobj, "device"); | |
2505 | if (err) { | |
2506 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2507 | goto fail; | |
2508 | } | |
971fcd49 | 2509 | |
d5c3834e DW |
2510 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
2511 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2512 | } |
2513 | ||
3b23dd6f | 2514 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2515 | usb_mark_last_busy(udev); |
2516 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2517 | return err; |
1da177e4 LT |
2518 | |
2519 | fail: | |
2520 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2521 | pm_runtime_disable(&udev->dev); |
2522 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2523 | return err; |
1da177e4 LT |
2524 | } |
2525 | ||
93993a0a IPG |
2526 | |
2527 | /** | |
fd39c86b RD |
2528 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2529 | * @usb_dev: USB device | |
2530 | * | |
2531 | * Move the USB device to a very basic state where interfaces are disabled | |
2532 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2533 | * |
2534 | * We share a lock (that we have) with device_del(), so we need to | |
2535 | * defer its call. | |
626f090c YB |
2536 | * |
2537 | * Return: 0. | |
93993a0a IPG |
2538 | */ |
2539 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2540 | { | |
93993a0a IPG |
2541 | usb_lock_device(usb_dev); |
2542 | if (usb_dev->authorized == 0) | |
2543 | goto out_unauthorized; | |
da307123 | 2544 | |
93993a0a IPG |
2545 | usb_dev->authorized = 0; |
2546 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2547 | |
93993a0a IPG |
2548 | out_unauthorized: |
2549 | usb_unlock_device(usb_dev); | |
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | ||
2554 | int usb_authorize_device(struct usb_device *usb_dev) | |
2555 | { | |
2556 | int result = 0, c; | |
da307123 | 2557 | |
93993a0a IPG |
2558 | usb_lock_device(usb_dev); |
2559 | if (usb_dev->authorized == 1) | |
2560 | goto out_authorized; | |
da307123 | 2561 | |
93993a0a IPG |
2562 | result = usb_autoresume_device(usb_dev); |
2563 | if (result < 0) { | |
2564 | dev_err(&usb_dev->dev, | |
2565 | "can't autoresume for authorization: %d\n", result); | |
2566 | goto error_autoresume; | |
2567 | } | |
e50a322e JG |
2568 | |
2569 | if (usb_dev->wusb) { | |
2570 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2571 | if (result < 0) { | |
2572 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2573 | "authorization: %d\n", result); | |
2574 | goto error_device_descriptor; | |
2575 | } | |
93993a0a | 2576 | } |
da307123 | 2577 | |
93993a0a | 2578 | usb_dev->authorized = 1; |
93993a0a IPG |
2579 | /* Choose and set the configuration. This registers the interfaces |
2580 | * with the driver core and lets interface drivers bind to them. | |
2581 | */ | |
b5ea060f | 2582 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2583 | if (c >= 0) { |
2584 | result = usb_set_configuration(usb_dev, c); | |
2585 | if (result) { | |
2586 | dev_err(&usb_dev->dev, | |
2587 | "can't set config #%d, error %d\n", c, result); | |
2588 | /* This need not be fatal. The user can try to | |
2589 | * set other configurations. */ | |
2590 | } | |
2591 | } | |
2592 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2593 | |
93993a0a | 2594 | error_device_descriptor: |
da307123 | 2595 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2596 | error_autoresume: |
2597 | out_authorized: | |
781b2137 | 2598 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2599 | return result; |
2600 | } | |
2601 | ||
0cdd49a1 MN |
2602 | /* |
2603 | * Return 1 if port speed is SuperSpeedPlus, 0 otherwise | |
2604 | * check it from the link protocol field of the current speed ID attribute. | |
2605 | * current speed ID is got from ext port status request. Sublink speed attribute | |
2606 | * table is returned with the hub BOS SSP device capability descriptor | |
2607 | */ | |
2608 | static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) | |
2609 | { | |
2610 | int ssa_count; | |
2611 | u32 ss_attr; | |
2612 | int i; | |
2613 | struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; | |
2614 | ||
2615 | if (!ssp_cap) | |
2616 | return 0; | |
2617 | ||
2618 | ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & | |
2619 | USB_SSP_SUBLINK_SPEED_ATTRIBS; | |
2620 | ||
2621 | for (i = 0; i <= ssa_count; i++) { | |
2622 | ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); | |
2623 | if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) | |
2624 | return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); | |
2625 | } | |
2626 | return 0; | |
2627 | } | |
93993a0a | 2628 | |
0165de09 IPG |
2629 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2630 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2631 | { | |
2632 | struct usb_hcd *hcd; | |
2633 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2634 | return 0; | |
6ae706ae | 2635 | hcd = bus_to_hcd(hub->hdev->bus); |
0165de09 IPG |
2636 | return hcd->wireless; |
2637 | } | |
2638 | ||
2639 | ||
1da177e4 LT |
2640 | #define PORT_RESET_TRIES 5 |
2641 | #define SET_ADDRESS_TRIES 2 | |
2642 | #define GET_DESCRIPTOR_TRIES 2 | |
2643 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
25244227 | 2644 | #define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)scheme) |
1da177e4 | 2645 | |
74072bae | 2646 | #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ |
1da177e4 | 2647 | #define HUB_SHORT_RESET_TIME 10 |
75d7cf72 | 2648 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2649 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2650 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2651 | |
48fc7dbd DW |
2652 | /* |
2653 | * "New scheme" enumeration causes an extra state transition to be | |
2654 | * exposed to an xhci host and causes USB3 devices to receive control | |
2655 | * commands in the default state. This has been seen to cause | |
2656 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2657 | * devices. | |
2658 | */ | |
25244227 NB |
2659 | static bool use_new_scheme(struct usb_device *udev, int retry, |
2660 | struct usb_port *port_dev) | |
48fc7dbd | 2661 | { |
25244227 NB |
2662 | int old_scheme_first_port = |
2663 | port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME; | |
bd0e6c96 | 2664 | int quick_enumeration = (udev->speed == USB_SPEED_HIGH); |
25244227 | 2665 | |
8a1b2725 | 2666 | if (udev->speed >= USB_SPEED_SUPER) |
48fc7dbd DW |
2667 | return false; |
2668 | ||
bd0e6c96 ZT |
2669 | return USE_NEW_SCHEME(retry, old_scheme_first_port || old_scheme_first |
2670 | || quick_enumeration); | |
48fc7dbd DW |
2671 | } |
2672 | ||
025d4430 | 2673 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2674 | * Port worm reset is required to recover |
2675 | */ | |
3cd12f91 DW |
2676 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
2677 | u16 portstatus) | |
10d674a8 | 2678 | { |
3cd12f91 DW |
2679 | u16 link_state; |
2680 | ||
2681 | if (!hub_is_superspeed(hub->hdev)) | |
2682 | return false; | |
2683 | ||
2684 | if (test_bit(port1, hub->warm_reset_bits)) | |
2685 | return true; | |
2686 | ||
2687 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; | |
2688 | return link_state == USB_SS_PORT_LS_SS_INACTIVE | |
2689 | || link_state == USB_SS_PORT_LS_COMP_MOD; | |
10d674a8 SS |
2690 | } |
2691 | ||
1da177e4 | 2692 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2693 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2694 | { |
2695 | int delay_time, ret; | |
2696 | u16 portstatus; | |
2697 | u16 portchange; | |
0cdd49a1 | 2698 | u32 ext_portstatus = 0; |
1da177e4 LT |
2699 | |
2700 | for (delay_time = 0; | |
2701 | delay_time < HUB_RESET_TIMEOUT; | |
2702 | delay_time += delay) { | |
2703 | /* wait to give the device a chance to reset */ | |
2704 | msleep(delay); | |
2705 | ||
2706 | /* read and decode port status */ | |
0cdd49a1 MN |
2707 | if (hub_is_superspeedplus(hub->hdev)) |
2708 | ret = hub_ext_port_status(hub, port1, | |
2709 | HUB_EXT_PORT_STATUS, | |
2710 | &portstatus, &portchange, | |
2711 | &ext_portstatus); | |
2712 | else | |
2713 | ret = hub_port_status(hub, port1, &portstatus, | |
2714 | &portchange); | |
1da177e4 LT |
2715 | if (ret < 0) |
2716 | return ret; | |
2717 | ||
22547c4c GR |
2718 | /* |
2719 | * The port state is unknown until the reset completes. | |
2720 | * | |
2721 | * On top of that, some chips may require additional time | |
2722 | * to re-establish a connection after the reset is complete, | |
2723 | * so also wait for the connection to be re-established. | |
2724 | */ | |
2725 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
2726 | (portstatus & USB_PORT_STAT_CONNECTION)) | |
470f0be8 | 2727 | break; |
1da177e4 LT |
2728 | |
2729 | /* switch to the long delay after two short delay failures */ | |
2730 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2731 | delay = HUB_LONG_RESET_TIME; | |
2732 | ||
d99f6b41 DW |
2733 | dev_dbg(&hub->ports[port1 - 1]->dev, |
2734 | "not %sreset yet, waiting %dms\n", | |
2735 | warm ? "warm " : "", delay); | |
1da177e4 LT |
2736 | } |
2737 | ||
470f0be8 SS |
2738 | if ((portstatus & USB_PORT_STAT_RESET)) |
2739 | return -EBUSY; | |
2740 | ||
3cd12f91 | 2741 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
470f0be8 SS |
2742 | return -ENOTCONN; |
2743 | ||
2744 | /* Device went away? */ | |
2745 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2746 | return -ENOTCONN; | |
2747 | ||
1ac7db63 MN |
2748 | /* Retry if connect change is set but status is still connected. |
2749 | * A USB 3.0 connection may bounce if multiple warm resets were issued, | |
470f0be8 SS |
2750 | * but the device may have successfully re-connected. Ignore it. |
2751 | */ | |
2752 | if (!hub_is_superspeed(hub->hdev) && | |
1ac7db63 MN |
2753 | (portchange & USB_PORT_STAT_C_CONNECTION)) { |
2754 | usb_clear_port_feature(hub->hdev, port1, | |
2755 | USB_PORT_FEAT_C_CONNECTION); | |
2756 | return -EAGAIN; | |
2757 | } | |
470f0be8 SS |
2758 | |
2759 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2760 | return -EBUSY; | |
2761 | ||
2762 | if (!udev) | |
2763 | return 0; | |
2764 | ||
013eedb8 MN |
2765 | if (hub_is_superspeedplus(hub->hdev)) { |
2766 | /* extended portstatus Rx and Tx lane count are zero based */ | |
2767 | udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; | |
2768 | udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; | |
2769 | } else { | |
2770 | udev->rx_lanes = 1; | |
2771 | udev->tx_lanes = 1; | |
2772 | } | |
470f0be8 SS |
2773 | if (hub_is_wusb(hub)) |
2774 | udev->speed = USB_SPEED_WIRELESS; | |
0cdd49a1 MN |
2775 | else if (hub_is_superspeedplus(hub->hdev) && |
2776 | port_speed_is_ssp(hub->hdev, ext_portstatus & | |
2777 | USB_EXT_PORT_STAT_RX_SPEED_ID)) | |
2778 | udev->speed = USB_SPEED_SUPER_PLUS; | |
470f0be8 SS |
2779 | else if (hub_is_superspeed(hub->hdev)) |
2780 | udev->speed = USB_SPEED_SUPER; | |
2781 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2782 | udev->speed = USB_SPEED_HIGH; | |
2783 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2784 | udev->speed = USB_SPEED_LOW; | |
2785 | else | |
2786 | udev->speed = USB_SPEED_FULL; | |
2787 | return 0; | |
1da177e4 LT |
2788 | } |
2789 | ||
75d7cf72 | 2790 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
1da177e4 | 2791 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2792 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2793 | { |
2794 | int i, status; | |
a24a6078 | 2795 | u16 portchange, portstatus; |
d99f6b41 | 2796 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
781f0766 | 2797 | int reset_recovery_time; |
1da177e4 | 2798 | |
0fe51aa5 SS |
2799 | if (!hub_is_superspeed(hub->hdev)) { |
2800 | if (warm) { | |
75d7cf72 AX |
2801 | dev_err(hub->intfdev, "only USB3 hub support " |
2802 | "warm reset\n"); | |
2803 | return -EINVAL; | |
2804 | } | |
0fe51aa5 SS |
2805 | /* Block EHCI CF initialization during the port reset. |
2806 | * Some companion controllers don't like it when they mix. | |
2807 | */ | |
2808 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2809 | } else if (!warm) { |
2810 | /* | |
2811 | * If the caller hasn't explicitly requested a warm reset, | |
2812 | * double check and see if one is needed. | |
2813 | */ | |
fb6d1f7d RS |
2814 | if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) |
2815 | if (hub_port_warm_reset_required(hub, port1, | |
2816 | portstatus)) | |
2817 | warm = true; | |
75d7cf72 | 2818 | } |
3cd12f91 | 2819 | clear_bit(port1, hub->warm_reset_bits); |
32fe0198 | 2820 | |
1da177e4 LT |
2821 | /* Reset the port */ |
2822 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2823 | status = set_port_feature(hub->hdev, port1, (warm ? |
2824 | USB_PORT_FEAT_BH_PORT_RESET : | |
2825 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2826 | if (status == -ENODEV) { |
2827 | ; /* The hub is gone */ | |
2828 | } else if (status) { | |
d99f6b41 DW |
2829 | dev_err(&port_dev->dev, |
2830 | "cannot %sreset (err = %d)\n", | |
2831 | warm ? "warm " : "", status); | |
75d7cf72 AX |
2832 | } else { |
2833 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2834 | warm); | |
e9e88fb7 | 2835 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2836 | dev_dbg(hub->intfdev, |
2837 | "port_wait_reset: err = %d\n", | |
2838 | status); | |
2839 | } | |
2840 | ||
a24a6078 | 2841 | /* Check for disconnect or reset */ |
75d7cf72 | 2842 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
fb6d1f7d RS |
2843 | usb_clear_port_feature(hub->hdev, port1, |
2844 | USB_PORT_FEAT_C_RESET); | |
a24a6078 SS |
2845 | |
2846 | if (!hub_is_superspeed(hub->hdev)) | |
2847 | goto done; | |
2848 | ||
fb6d1f7d RS |
2849 | usb_clear_port_feature(hub->hdev, port1, |
2850 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
2851 | usb_clear_port_feature(hub->hdev, port1, | |
2852 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
22454b79 DW |
2853 | |
2854 | if (udev) | |
2855 | usb_clear_port_feature(hub->hdev, port1, | |
fb6d1f7d RS |
2856 | USB_PORT_FEAT_C_CONNECTION); |
2857 | ||
a24a6078 SS |
2858 | /* |
2859 | * If a USB 3.0 device migrates from reset to an error | |
2860 | * state, re-issue the warm reset. | |
2861 | */ | |
2862 | if (hub_port_status(hub, port1, | |
2863 | &portstatus, &portchange) < 0) | |
2864 | goto done; | |
2865 | ||
3cd12f91 DW |
2866 | if (!hub_port_warm_reset_required(hub, port1, |
2867 | portstatus)) | |
a24a6078 SS |
2868 | goto done; |
2869 | ||
2870 | /* | |
2871 | * If the port is in SS.Inactive or Compliance Mode, the | |
2872 | * hot or warm reset failed. Try another warm reset. | |
2873 | */ | |
2874 | if (!warm) { | |
d99f6b41 DW |
2875 | dev_dbg(&port_dev->dev, |
2876 | "hot reset failed, warm reset\n"); | |
a24a6078 SS |
2877 | warm = true; |
2878 | } | |
1da177e4 LT |
2879 | } |
2880 | ||
d99f6b41 DW |
2881 | dev_dbg(&port_dev->dev, |
2882 | "not enabled, trying %sreset again...\n", | |
2883 | warm ? "warm " : ""); | |
1da177e4 LT |
2884 | delay = HUB_LONG_RESET_TIME; |
2885 | } | |
2886 | ||
d99f6b41 | 2887 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
1da177e4 | 2888 | |
75d7cf72 | 2889 | done: |
fb6d1f7d | 2890 | if (status == 0) { |
aa071a92 NB |
2891 | if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM) |
2892 | usleep_range(10000, 12000); | |
781f0766 KHF |
2893 | else { |
2894 | /* TRSTRCY = 10 ms; plus some extra */ | |
2895 | reset_recovery_time = 10 + 40; | |
2896 | ||
2897 | /* Hub needs extra delay after resetting its port. */ | |
2898 | if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET) | |
2899 | reset_recovery_time += 100; | |
2900 | ||
2901 | msleep(reset_recovery_time); | |
2902 | } | |
aa071a92 | 2903 | |
fb6d1f7d RS |
2904 | if (udev) { |
2905 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2906 | ||
2907 | update_devnum(udev, 0); | |
2908 | /* The xHC may think the device is already reset, | |
2909 | * so ignore the status. | |
2910 | */ | |
2911 | if (hcd->driver->reset_device) | |
2912 | hcd->driver->reset_device(hcd, udev); | |
2913 | ||
2914 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2915 | } | |
2916 | } else { | |
2917 | if (udev) | |
2918 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
2919 | } | |
2920 | ||
0fe51aa5 | 2921 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2922 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2923 | |
75d7cf72 | 2924 | return status; |
5e467f6e AX |
2925 | } |
2926 | ||
0ed9a57e AX |
2927 | /* Check if a port is power on */ |
2928 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2929 | { | |
2930 | int ret = 0; | |
2931 | ||
2932 | if (hub_is_superspeed(hub->hdev)) { | |
2933 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2934 | ret = 1; | |
2935 | } else { | |
2936 | if (portstatus & USB_PORT_STAT_POWER) | |
2937 | ret = 1; | |
2938 | } | |
2939 | ||
2940 | return ret; | |
2941 | } | |
2942 | ||
5c79a1e3 DW |
2943 | static void usb_lock_port(struct usb_port *port_dev) |
2944 | __acquires(&port_dev->status_lock) | |
2945 | { | |
2946 | mutex_lock(&port_dev->status_lock); | |
2947 | __acquire(&port_dev->status_lock); | |
2948 | } | |
2949 | ||
2950 | static void usb_unlock_port(struct usb_port *port_dev) | |
2951 | __releases(&port_dev->status_lock) | |
2952 | { | |
2953 | mutex_unlock(&port_dev->status_lock); | |
2954 | __release(&port_dev->status_lock); | |
2955 | } | |
2956 | ||
d388dab7 | 2957 | #ifdef CONFIG_PM |
1da177e4 | 2958 | |
0ed9a57e AX |
2959 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2960 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2961 | { | |
2962 | int ret = 0; | |
2963 | ||
2964 | if (hub_is_superspeed(hub->hdev)) { | |
2965 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2966 | == USB_SS_PORT_LS_U3) | |
2967 | ret = 1; | |
2968 | } else { | |
2969 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2970 | ret = 1; | |
2971 | } | |
2972 | ||
2973 | return ret; | |
2974 | } | |
b01b03f3 AS |
2975 | |
2976 | /* Determine whether the device on a port is ready for a normal resume, | |
2977 | * is ready for a reset-resume, or should be disconnected. | |
2978 | */ | |
2979 | static int check_port_resume_type(struct usb_device *udev, | |
2980 | struct usb_hub *hub, int port1, | |
7fa40910 | 2981 | int status, u16 portchange, u16 portstatus) |
b01b03f3 | 2982 | { |
d99f6b41 | 2983 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
7fa40910 | 2984 | int retries = 3; |
d99f6b41 | 2985 | |
7fa40910 | 2986 | retry: |
3cd12f91 DW |
2987 | /* Is a warm reset needed to recover the connection? */ |
2988 | if (status == 0 && udev->reset_resume | |
2989 | && hub_port_warm_reset_required(hub, port1, portstatus)) { | |
2990 | /* pass */; | |
2991 | } | |
b01b03f3 | 2992 | /* Is the device still present? */ |
3cd12f91 | 2993 | else if (status || port_is_suspended(hub, portstatus) || |
7fa40910 | 2994 | !port_is_power_on(hub, portstatus)) { |
b01b03f3 AS |
2995 | if (status >= 0) |
2996 | status = -ENODEV; | |
7fa40910 JW |
2997 | } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2998 | if (retries--) { | |
2999 | usleep_range(200, 300); | |
3000 | status = hub_port_status(hub, port1, &portstatus, | |
3001 | &portchange); | |
3002 | goto retry; | |
3003 | } | |
3004 | status = -ENODEV; | |
b01b03f3 AS |
3005 | } |
3006 | ||
86c57edf AS |
3007 | /* Can't do a normal resume if the port isn't enabled, |
3008 | * so try a reset-resume instead. | |
3009 | */ | |
3010 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
3011 | if (udev->persist_enabled) | |
3012 | udev->reset_resume = 1; | |
3013 | else | |
3014 | status = -ENODEV; | |
3015 | } | |
b01b03f3 AS |
3016 | |
3017 | if (status) { | |
d99f6b41 DW |
3018 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
3019 | portchange, portstatus, status); | |
b01b03f3 AS |
3020 | } else if (udev->reset_resume) { |
3021 | ||
3022 | /* Late port handoff can set status-change bits */ | |
3023 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 3024 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
3025 | USB_PORT_FEAT_C_CONNECTION); |
3026 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 3027 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
3028 | USB_PORT_FEAT_C_ENABLE); |
3029 | } | |
3030 | ||
3031 | return status; | |
3032 | } | |
3033 | ||
f74631e3 SS |
3034 | int usb_disable_ltm(struct usb_device *udev) |
3035 | { | |
3036 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3037 | ||
3038 | /* Check if the roothub and device supports LTM. */ | |
3039 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
3040 | !usb_device_supports_ltm(udev)) | |
3041 | return 0; | |
3042 | ||
3043 | /* Clear Feature LTM Enable can only be sent if the device is | |
3044 | * configured. | |
3045 | */ | |
3046 | if (!udev->actconfig) | |
3047 | return 0; | |
3048 | ||
3049 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3050 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3051 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
3052 | USB_CTRL_SET_TIMEOUT); | |
3053 | } | |
3054 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
3055 | ||
3056 | void usb_enable_ltm(struct usb_device *udev) | |
3057 | { | |
3058 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3059 | ||
3060 | /* Check if the roothub and device supports LTM. */ | |
3061 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
3062 | !usb_device_supports_ltm(udev)) | |
3063 | return; | |
3064 | ||
3065 | /* Set Feature LTM Enable can only be sent if the device is | |
3066 | * configured. | |
3067 | */ | |
3068 | if (!udev->actconfig) | |
3069 | return; | |
3070 | ||
3071 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3072 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3073 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
3074 | USB_CTRL_SET_TIMEOUT); | |
3075 | } | |
3076 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
3077 | ||
54a3ac0c | 3078 | /* |
28e86165 | 3079 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
3080 | * @udev: target device |
3081 | * | |
28e86165 AS |
3082 | * For USB-2 devices: Set the device's remote wakeup feature. |
3083 | * | |
3084 | * For USB-3 devices: Assume there's only one function on the device and | |
3085 | * enable remote wake for the first interface. FIXME if the interface | |
3086 | * association descriptor shows there's more than one function. | |
54a3ac0c | 3087 | */ |
28e86165 | 3088 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 3089 | { |
28e86165 AS |
3090 | if (udev->speed < USB_SPEED_SUPER) |
3091 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3092 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3093 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3094 | USB_CTRL_SET_TIMEOUT); | |
3095 | else | |
3096 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3097 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
3098 | USB_INTRF_FUNC_SUSPEND, | |
3099 | USB_INTRF_FUNC_SUSPEND_RW | | |
3100 | USB_INTRF_FUNC_SUSPEND_LP, | |
3101 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3102 | } | |
3103 | ||
3104 | /* | |
3105 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
3106 | * @udev: target device | |
3107 | * | |
3108 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
3109 | * | |
3110 | * For USB-3 devices: Assume there's only one function on the device and | |
3111 | * disable remote wake for the first interface. FIXME if the interface | |
3112 | * association descriptor shows there's more than one function. | |
3113 | */ | |
3114 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
3115 | { | |
3116 | if (udev->speed < USB_SPEED_SUPER) | |
3117 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3118 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3119 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3120 | USB_CTRL_SET_TIMEOUT); | |
3121 | else | |
3122 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
4e248000 | 3123 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
54a3ac0c LT |
3124 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, |
3125 | USB_CTRL_SET_TIMEOUT); | |
3126 | } | |
1da177e4 | 3127 | |
e583d9db AS |
3128 | /* Count of wakeup-enabled devices at or below udev */ |
3129 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
3130 | { | |
3131 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
3132 | ||
3133 | return udev->do_remote_wakeup + | |
3134 | (hub ? hub->wakeup_enabled_descendants : 0); | |
3135 | } | |
3136 | ||
1da177e4 | 3137 | /* |
624d6c07 AS |
3138 | * usb_port_suspend - suspend a usb device's upstream port |
3139 | * @udev: device that's no longer in active use, not a root hub | |
3140 | * Context: must be able to sleep; device not locked; pm locks held | |
3141 | * | |
3142 | * Suspends a USB device that isn't in active use, conserving power. | |
3143 | * Devices may wake out of a suspend, if anything important happens, | |
3144 | * using the remote wakeup mechanism. They may also be taken out of | |
3145 | * suspend by the host, using usb_port_resume(). It's also routine | |
3146 | * to disconnect devices while they are suspended. | |
3147 | * | |
3148 | * This only affects the USB hardware for a device; its interfaces | |
3149 | * (and, for hubs, child devices) must already have been suspended. | |
3150 | * | |
1da177e4 LT |
3151 | * Selective port suspend reduces power; most suspended devices draw |
3152 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
3153 | * All devices below the suspended port are also suspended. | |
3154 | * | |
3155 | * Devices leave suspend state when the host wakes them up. Some devices | |
3156 | * also support "remote wakeup", where the device can activate the USB | |
3157 | * tree above them to deliver data, such as a keypress or packet. In | |
3158 | * some cases, this wakes the USB host. | |
624d6c07 AS |
3159 | * |
3160 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
3161 | * between a pair of dual-role devices. That will change roles, such | |
3162 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
3163 | * | |
3164 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
3165 | * to ACPI D2, "may cause the device to lose some context". | |
3166 | * State transitions include: | |
3167 | * | |
3168 | * - suspend, resume ... when the VBUS power link stays live | |
3169 | * - suspend, disconnect ... VBUS lost | |
3170 | * | |
3171 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
3172 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
3173 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
37ebb549 | 3174 | * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq |
624d6c07 AS |
3175 | * timer, no SRP, no requests through sysfs. |
3176 | * | |
e583d9db AS |
3177 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
3178 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
3179 | * hub is suspended). Nevertheless, we change @udev->state to |
3180 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
3181 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
3182 | * |
3183 | * Returns 0 on success, else negative errno. | |
1da177e4 | 3184 | */ |
65bfd296 | 3185 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3186 | { |
ad493e5e LT |
3187 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3188 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3189 | int port1 = udev->portnum; |
3190 | int status; | |
0aa2832d | 3191 | bool really_suspend = true; |
1da177e4 | 3192 | |
5c79a1e3 DW |
3193 | usb_lock_port(port_dev); |
3194 | ||
1da177e4 LT |
3195 | /* enable remote wakeup when appropriate; this lets the device |
3196 | * wake up the upstream hub (including maybe the root hub). | |
3197 | * | |
3198 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
3199 | * we don't explicitly enable it here. | |
3200 | */ | |
645daaab | 3201 | if (udev->do_remote_wakeup) { |
28e86165 | 3202 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 3203 | if (status) { |
624d6c07 AS |
3204 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
3205 | status); | |
0c487206 | 3206 | /* bail if autosuspend is requested */ |
5b1b0b81 | 3207 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 3208 | goto err_wakeup; |
0c487206 | 3209 | } |
1da177e4 LT |
3210 | } |
3211 | ||
65580b43 AX |
3212 | /* disable USB2 hardware LPM */ |
3213 | if (udev->usb2_hw_lpm_enabled == 1) | |
3214 | usb_set_usb2_hardware_lpm(udev, 0); | |
3215 | ||
f74631e3 | 3216 | if (usb_disable_ltm(udev)) { |
1ccc417e | 3217 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); |
4fae6f0f AS |
3218 | status = -ENOMEM; |
3219 | if (PMSG_IS_AUTO(msg)) | |
3220 | goto err_ltm; | |
f74631e3 | 3221 | } |
8306095f | 3222 | |
1da177e4 | 3223 | /* see 7.1.7.6 */ |
a7114230 | 3224 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3225 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3226 | |
0aa2832d AS |
3227 | /* |
3228 | * For system suspend, we do not need to enable the suspend feature | |
3229 | * on individual USB-2 ports. The devices will automatically go | |
3230 | * into suspend a few ms after the root hub stops sending packets. | |
3231 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3232 | * |
3233 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3234 | * from a downstream port if the port's suspend feature isn't on. | |
3235 | * Therefore we will turn on the suspend feature if udev or any of its | |
3236 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3237 | */ |
e583d9db AS |
3238 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3239 | status = set_port_feature(hub->hdev, port1, | |
3240 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3241 | else { |
3242 | really_suspend = false; | |
3243 | status = 0; | |
3244 | } | |
1da177e4 | 3245 | if (status) { |
d99f6b41 | 3246 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
cbb33004 | 3247 | |
d590c231 | 3248 | /* Try to enable USB3 LTM again */ |
4fae6f0f AS |
3249 | usb_enable_ltm(udev); |
3250 | err_ltm: | |
c3e751e4 AX |
3251 | /* Try to enable USB2 hardware LPM again */ |
3252 | if (udev->usb2_hw_lpm_capable == 1) | |
3253 | usb_set_usb2_hardware_lpm(udev, 1); | |
3254 | ||
4fae6f0f AS |
3255 | if (udev->do_remote_wakeup) |
3256 | (void) usb_disable_remote_wakeup(udev); | |
3257 | err_wakeup: | |
8306095f | 3258 | |
cbb33004 | 3259 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3260 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3261 | status = 0; |
1da177e4 | 3262 | } else { |
30b1a7a3 AS |
3263 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3264 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3265 | udev->do_remote_wakeup); | |
0aa2832d AS |
3266 | if (really_suspend) { |
3267 | udev->port_is_suspended = 1; | |
e583d9db AS |
3268 | |
3269 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3270 | msleep(10); |
3271 | } | |
e583d9db | 3272 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3273 | } |
ad493e5e | 3274 | |
d5c3834e DW |
3275 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
3276 | && test_and_clear_bit(port1, hub->child_usage_bits)) | |
98a4f1ff | 3277 | pm_runtime_put_sync(&port_dev->dev); |
ad493e5e | 3278 | |
c08512c7 | 3279 | usb_mark_last_busy(hub->hdev); |
5c79a1e3 DW |
3280 | |
3281 | usb_unlock_port(port_dev); | |
1da177e4 LT |
3282 | return status; |
3283 | } | |
3284 | ||
1da177e4 | 3285 | /* |
390a8c34 DB |
3286 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3287 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3288 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3289 | * hardware resume signaling is finished, either because of selective |
3290 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3291 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3292 | * |
3293 | * If @udev->reset_resume is set then the device is reset before the | |
3294 | * status check is done. | |
1da177e4 | 3295 | */ |
140d8f68 | 3296 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3297 | { |
54515fe5 | 3298 | int status = 0; |
07e72b95 | 3299 | u16 devstatus = 0; |
1da177e4 LT |
3300 | |
3301 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3302 | dev_dbg(&udev->dev, "%s\n", |
3303 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3304 | |
3305 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3306 | * state the device resumes to. Linux currently won't see the | |
3307 | * first two on the host side; they'd be inside hub_port_init() | |
37ebb549 | 3308 | * during many timeouts, but hub_wq can't suspend until later. |
1da177e4 LT |
3309 | */ |
3310 | usb_set_device_state(udev, udev->actconfig | |
3311 | ? USB_STATE_CONFIGURED | |
3312 | : USB_STATE_ADDRESS); | |
1da177e4 | 3313 | |
54515fe5 AS |
3314 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3315 | * device is enabled for remote wakeup. Hence the reset | |
3316 | * operation is carried out here, after the port has been | |
3317 | * resumed. | |
3318 | */ | |
1d10255c AS |
3319 | if (udev->reset_resume) { |
3320 | /* | |
3321 | * If the device morphs or switches modes when it is reset, | |
3322 | * we don't want to perform a reset-resume. We'll fail the | |
3323 | * resume, which will cause a logical disconnect, and then | |
3324 | * the device will be rediscovered. | |
3325 | */ | |
86c57edf | 3326 | retry_reset_resume: |
1d10255c AS |
3327 | if (udev->quirks & USB_QUIRK_RESET) |
3328 | status = -ENODEV; | |
3329 | else | |
3330 | status = usb_reset_and_verify_device(udev); | |
3331 | } | |
54515fe5 | 3332 | |
469271f8 MB |
3333 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3334 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3335 | * and device drivers will know about any resume quirks. |
3336 | */ | |
54515fe5 | 3337 | if (status == 0) { |
46dede46 | 3338 | devstatus = 0; |
d9e1e148 | 3339 | status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3340 | |
3341 | /* If a normal resume failed, try doing a reset-resume */ | |
3342 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3343 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3344 | udev->reset_resume = 1; | |
3345 | goto retry_reset_resume; | |
3346 | } | |
54515fe5 | 3347 | } |
b40b7a90 | 3348 | |
624d6c07 AS |
3349 | if (status) { |
3350 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3351 | status); | |
07e72b95 ON |
3352 | /* |
3353 | * There are a few quirky devices which violate the standard | |
3354 | * by claiming to have remote wakeup enabled after a reset, | |
3355 | * which crash if the feature is cleared, hence check for | |
3356 | * udev->reset_resume | |
3357 | */ | |
3358 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3359 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3360 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3361 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c | 3362 | } else { |
d9e1e148 | 3363 | status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0, |
54a3ac0c | 3364 | &devstatus); |
54a3ac0c LT |
3365 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3366 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3367 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3368 | } |
54a3ac0c LT |
3369 | |
3370 | if (status) | |
3371 | dev_dbg(&udev->dev, | |
3372 | "disable remote wakeup, status %d\n", | |
3373 | status); | |
1da177e4 | 3374 | status = 0; |
1da177e4 LT |
3375 | } |
3376 | return status; | |
3377 | } | |
3378 | ||
a40178b2 PA |
3379 | /* |
3380 | * There are some SS USB devices which take longer time for link training. | |
3381 | * XHCI specs 4.19.4 says that when Link training is successful, port | |
6b82b122 | 3382 | * sets CCS bit to 1. So if SW reads port status before successful link |
a40178b2 PA |
3383 | * training, then it will not find device to be present. |
3384 | * USB Analyzer log with such buggy devices show that in some cases | |
3385 | * device switch on the RX termination after long delay of host enabling | |
3386 | * the VBUS. In few other cases it has been seen that device fails to | |
3387 | * negotiate link training in first attempt. It has been | |
3388 | * reported till now that few devices take as long as 2000 ms to train | |
3389 | * the link after host enabling its VBUS and termination. Following | |
3390 | * routine implements a 2000 ms timeout for link training. If in a case | |
3391 | * link trains before timeout, loop will exit earlier. | |
3392 | * | |
6b82b122 AC |
3393 | * There are also some 2.0 hard drive based devices and 3.0 thumb |
3394 | * drives that, when plugged into a 2.0 only port, take a long | |
3395 | * time to set CCS after VBUS enable. | |
3396 | * | |
a40178b2 PA |
3397 | * FIXME: If a device was connected before suspend, but was removed |
3398 | * while system was asleep, then the loop in the following routine will | |
3399 | * only exit at timeout. | |
3400 | * | |
6b82b122 | 3401 | * This routine should only be called when persist is enabled. |
a40178b2 | 3402 | */ |
6b82b122 | 3403 | static int wait_for_connected(struct usb_device *udev, |
a40178b2 PA |
3404 | struct usb_hub *hub, int *port1, |
3405 | u16 *portchange, u16 *portstatus) | |
3406 | { | |
3407 | int status = 0, delay_ms = 0; | |
3408 | ||
3409 | while (delay_ms < 2000) { | |
3410 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) | |
3411 | break; | |
5d111f51 DB |
3412 | if (!port_is_power_on(hub, *portstatus)) { |
3413 | status = -ENODEV; | |
3414 | break; | |
3415 | } | |
a40178b2 PA |
3416 | msleep(20); |
3417 | delay_ms += 20; | |
3418 | status = hub_port_status(hub, *port1, portstatus, portchange); | |
3419 | } | |
6b82b122 | 3420 | dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); |
a40178b2 PA |
3421 | return status; |
3422 | } | |
3423 | ||
624d6c07 AS |
3424 | /* |
3425 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3426 | * @udev: device to re-activate, not a root hub | |
3427 | * Context: must be able to sleep; device not locked; pm locks held | |
3428 | * | |
3429 | * This will re-activate the suspended device, increasing power usage | |
3430 | * while letting drivers communicate again with its endpoints. | |
3431 | * USB resume explicitly guarantees that the power session between | |
3432 | * the host and the device is the same as it was when the device | |
3433 | * suspended. | |
3434 | * | |
feccc30d AS |
3435 | * If @udev->reset_resume is set then this routine won't check that the |
3436 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3437 | * reset @udev. The end result is that a broken power session can be |
3438 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3439 | * | |
3440 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3441 | * during a system sleep or is reset when the system wakes up, all the USB | |
3442 | * power sessions below it will be broken. This is especially troublesome | |
3443 | * for mass-storage devices containing mounted filesystems, since the | |
3444 | * device will appear to have disconnected and all the memory mappings | |
3445 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3446 | * made to appear as if it had not disconnected. | |
3447 | * | |
742120c6 | 3448 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3449 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3450 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3451 | * quite possible for a device to remain unaltered but its media to be | |
3452 | * changed. If the user replaces a flash memory card while the system is | |
3453 | * asleep, he will have only himself to blame when the filesystem on the | |
3454 | * new card is corrupted and the system crashes. | |
3455 | * | |
624d6c07 AS |
3456 | * Returns 0 on success, else negative errno. |
3457 | */ | |
65bfd296 | 3458 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3459 | { |
ad493e5e LT |
3460 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3461 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3462 | int port1 = udev->portnum; |
3463 | int status; | |
3464 | u16 portchange, portstatus; | |
d25450c6 | 3465 | |
d5c3834e | 3466 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
ad493e5e | 3467 | status = pm_runtime_get_sync(&port_dev->dev); |
ad493e5e LT |
3468 | if (status < 0) { |
3469 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3470 | status); | |
3471 | return status; | |
3472 | } | |
3473 | } | |
3474 | ||
5c79a1e3 DW |
3475 | usb_lock_port(port_dev); |
3476 | ||
d25450c6 AS |
3477 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3478 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
83a62c51 RCS |
3479 | if (status == 0 && !port_is_suspended(hub, portstatus)) { |
3480 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
3481 | pm_wakeup_event(&udev->dev, 0); | |
d25450c6 | 3482 | goto SuspendCleared; |
83a62c51 | 3483 | } |
1da177e4 | 3484 | |
1da177e4 | 3485 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3486 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3487 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3488 | else |
ad493e5e | 3489 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3490 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3491 | if (status) { |
d99f6b41 | 3492 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
1da177e4 | 3493 | } else { |
bbc78c07 | 3494 | /* drive resume for USB_RESUME_TIMEOUT msec */ |
686314cf | 3495 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3496 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
bbc78c07 | 3497 | msleep(USB_RESUME_TIMEOUT); |
1da177e4 | 3498 | |
1da177e4 LT |
3499 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3500 | * stop resume signaling. Then finish the resume | |
3501 | * sequence. | |
3502 | */ | |
d25450c6 | 3503 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3504 | |
b01b03f3 AS |
3505 | /* TRSMRCY = 10 msec */ |
3506 | msleep(10); | |
3507 | } | |
3508 | ||
54515fe5 | 3509 | SuspendCleared: |
b01b03f3 | 3510 | if (status == 0) { |
bfd1e910 | 3511 | udev->port_is_suspended = 0; |
a7114230 AX |
3512 | if (hub_is_superspeed(hub->hdev)) { |
3513 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3514 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3515 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3516 | } else { | |
3517 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3518 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3519 | USB_PORT_FEAT_C_SUSPEND); |
3520 | } | |
1da177e4 | 3521 | } |
1da177e4 | 3522 | |
6b82b122 AC |
3523 | if (udev->persist_enabled) |
3524 | status = wait_for_connected(udev, hub, &port1, &portchange, | |
a40178b2 PA |
3525 | &portstatus); |
3526 | ||
b01b03f3 AS |
3527 | status = check_port_resume_type(udev, |
3528 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3529 | if (status == 0) |
3530 | status = finish_port_resume(udev); | |
3531 | if (status < 0) { | |
3532 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3533 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3534 | } else { |
3535 | /* Try to enable USB2 hardware LPM */ | |
3536 | if (udev->usb2_hw_lpm_capable == 1) | |
3537 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3538 | |
d590c231 | 3539 | /* Try to enable USB3 LTM */ |
f74631e3 | 3540 | usb_enable_ltm(udev); |
54515fe5 | 3541 | } |
65580b43 | 3542 | |
5c79a1e3 DW |
3543 | usb_unlock_port(port_dev); |
3544 | ||
1da177e4 LT |
3545 | return status; |
3546 | } | |
3547 | ||
0534d468 | 3548 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3549 | { |
3550 | int status = 0; | |
3551 | ||
5c79a1e3 | 3552 | usb_lock_device(udev); |
1da177e4 | 3553 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3554 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3555 | status = usb_autoresume_device(udev); |
3556 | if (status == 0) { | |
3557 | /* Let the drivers do their thing, then... */ | |
3558 | usb_autosuspend_device(udev); | |
3559 | } | |
1da177e4 | 3560 | } |
5c79a1e3 | 3561 | usb_unlock_device(udev); |
1da177e4 LT |
3562 | return status; |
3563 | } | |
3564 | ||
7e73be22 DW |
3565 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
3566 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3567 | u16 portstatus, u16 portchange) | |
3568 | __must_hold(&port_dev->status_lock) | |
3569 | { | |
3570 | struct usb_port *port_dev = hub->ports[port - 1]; | |
3571 | struct usb_device *hdev; | |
3572 | struct usb_device *udev; | |
3573 | int connect_change = 0; | |
3574 | int ret; | |
3575 | ||
3576 | hdev = hub->hdev; | |
3577 | udev = port_dev->child; | |
3578 | if (!hub_is_superspeed(hdev)) { | |
3579 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
3580 | return 0; | |
3581 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); | |
3582 | } else { | |
3583 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
3584 | (portstatus & USB_PORT_STAT_LINK_STATE) != | |
3585 | USB_SS_PORT_LS_U0) | |
3586 | return 0; | |
3587 | } | |
3588 | ||
3589 | if (udev) { | |
3590 | /* TRSMRCY = 10 msec */ | |
3591 | msleep(10); | |
3592 | ||
3593 | usb_unlock_port(port_dev); | |
3594 | ret = usb_remote_wakeup(udev); | |
3595 | usb_lock_port(port_dev); | |
3596 | if (ret < 0) | |
3597 | connect_change = 1; | |
3598 | } else { | |
3599 | ret = -ENODEV; | |
3600 | hub_port_disable(hub, port, 1); | |
3601 | } | |
3602 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); | |
3603 | return connect_change; | |
3604 | } | |
3605 | ||
e6f30dea ML |
3606 | static int check_ports_changed(struct usb_hub *hub) |
3607 | { | |
3608 | int port1; | |
3609 | ||
3610 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3611 | u16 portstatus, portchange; | |
3612 | int status; | |
3613 | ||
3614 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3615 | if (!status && portchange) | |
3616 | return 1; | |
3617 | } | |
3618 | return 0; | |
3619 | } | |
3620 | ||
db690874 | 3621 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 | 3622 | { |
17248569 | 3623 | struct usb_hub *hub = usb_get_intfdata(intf); |
1da177e4 LT |
3624 | struct usb_device *hdev = hub->hdev; |
3625 | unsigned port1; | |
4296c70a | 3626 | int status; |
1da177e4 | 3627 | |
e583d9db AS |
3628 | /* |
3629 | * Warn if children aren't already suspended. | |
3630 | * Also, add up the number of wakeup-enabled descendants. | |
3631 | */ | |
3632 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 | 3633 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
d99f6b41 DW |
3634 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
3635 | struct usb_device *udev = port_dev->child; | |
1da177e4 | 3636 | |
6840d255 | 3637 | if (udev && udev->can_submit) { |
b658b8f5 DW |
3638 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
3639 | dev_name(&udev->dev)); | |
5b1b0b81 | 3640 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3641 | return -EBUSY; |
c9f89fa4 | 3642 | } |
e583d9db AS |
3643 | if (udev) |
3644 | hub->wakeup_enabled_descendants += | |
3645 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3646 | } |
e6f30dea ML |
3647 | |
3648 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3649 | /* check if there are changes pending on hub ports */ | |
3650 | if (check_ports_changed(hub)) { | |
3651 | if (PMSG_IS_AUTO(msg)) | |
3652 | return -EBUSY; | |
3653 | pm_wakeup_event(&hdev->dev, 2000); | |
3654 | } | |
3655 | } | |
3656 | ||
4296c70a SS |
3657 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3658 | /* Enable hub to send remote wakeup for all ports. */ | |
3659 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3660 | status = set_port_feature(hdev, | |
3661 | port1 | | |
3662 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3663 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3664 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3665 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3666 | } | |
3667 | } | |
1da177e4 | 3668 | |
441b62c1 | 3669 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3670 | |
37ebb549 | 3671 | /* stop hub_wq and related activity */ |
4330354f | 3672 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3673 | return 0; |
1da177e4 LT |
3674 | } |
3675 | ||
379cacc5 AS |
3676 | /* Report wakeup requests from the ports of a resuming root hub */ |
3677 | static void report_wakeup_requests(struct usb_hub *hub) | |
3678 | { | |
3679 | struct usb_device *hdev = hub->hdev; | |
3680 | struct usb_device *udev; | |
3681 | struct usb_hcd *hcd; | |
3682 | unsigned long resuming_ports; | |
3683 | int i; | |
3684 | ||
3685 | if (hdev->parent) | |
3686 | return; /* Not a root hub */ | |
3687 | ||
3688 | hcd = bus_to_hcd(hdev->bus); | |
3689 | if (hcd->driver->get_resuming_ports) { | |
3690 | ||
3691 | /* | |
3692 | * The get_resuming_ports() method returns a bitmap (origin 0) | |
3693 | * of ports which have started wakeup signaling but have not | |
3694 | * yet finished resuming. During system resume we will | |
3695 | * resume all the enabled ports, regardless of any wakeup | |
3696 | * signals, which means the wakeup requests would be lost. | |
3697 | * To prevent this, report them to the PM core here. | |
3698 | */ | |
3699 | resuming_ports = hcd->driver->get_resuming_ports(hcd); | |
3700 | for (i = 0; i < hdev->maxchild; ++i) { | |
3701 | if (test_bit(i, &resuming_ports)) { | |
3702 | udev = hub->ports[i]->child; | |
3703 | if (udev) | |
3704 | pm_wakeup_event(&udev->dev, 0); | |
3705 | } | |
3706 | } | |
3707 | } | |
3708 | } | |
3709 | ||
1da177e4 LT |
3710 | static int hub_resume(struct usb_interface *intf) |
3711 | { | |
5e6effae | 3712 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3713 | |
5e6effae | 3714 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3715 | hub_activate(hub, HUB_RESUME); |
379cacc5 AS |
3716 | |
3717 | /* | |
3718 | * This should be called only for system resume, not runtime resume. | |
3719 | * We can't tell the difference here, so some wakeup requests will be | |
3720 | * reported at the wrong time or more than once. This shouldn't | |
3721 | * matter much, so long as they do get reported. | |
3722 | */ | |
3723 | report_wakeup_requests(hub); | |
1da177e4 LT |
3724 | return 0; |
3725 | } | |
3726 | ||
b41a60ec | 3727 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3728 | { |
b41a60ec | 3729 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3730 | |
5e6effae | 3731 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3732 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3733 | return 0; |
3734 | } | |
3735 | ||
54515fe5 AS |
3736 | /** |
3737 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3738 | * @rhdev: struct usb_device for the root hub | |
3739 | * | |
3740 | * The USB host controller driver calls this function when its root hub | |
3741 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3742 | * has been reset. The routine marks @rhdev as having lost power. |
3743 | * When the hub driver is resumed it will take notice and carry out | |
3744 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3745 | * the others will be disconnected. | |
54515fe5 AS |
3746 | */ |
3747 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3748 | { | |
0442d7b0 | 3749 | dev_notice(&rhdev->dev, "root hub lost power or was reset\n"); |
54515fe5 AS |
3750 | rhdev->reset_resume = 1; |
3751 | } | |
3752 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3753 | ||
1ea7e0e8 SS |
3754 | static const char * const usb3_lpm_names[] = { |
3755 | "U0", | |
3756 | "U1", | |
3757 | "U2", | |
3758 | "U3", | |
3759 | }; | |
3760 | ||
3761 | /* | |
3762 | * Send a Set SEL control transfer to the device, prior to enabling | |
3763 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3764 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3765 | * packet from the host. | |
3766 | * | |
3767 | * This function will fail if the SEL or PEL values for udev are greater than | |
3768 | * the maximum allowed values for the link state to be enabled. | |
3769 | */ | |
3770 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3771 | { | |
3772 | struct usb_set_sel_req *sel_values; | |
3773 | unsigned long long u1_sel; | |
3774 | unsigned long long u1_pel; | |
3775 | unsigned long long u2_sel; | |
3776 | unsigned long long u2_pel; | |
3777 | int ret; | |
3778 | ||
38d7f688 XR |
3779 | if (udev->state != USB_STATE_CONFIGURED) |
3780 | return 0; | |
3781 | ||
1ea7e0e8 SS |
3782 | /* Convert SEL and PEL stored in ns to us */ |
3783 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3784 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3785 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3786 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3787 | ||
3788 | /* | |
3789 | * Make sure that the calculated SEL and PEL values for the link | |
3790 | * state we're enabling aren't bigger than the max SEL/PEL | |
3791 | * value that will fit in the SET SEL control transfer. | |
3792 | * Otherwise the device would get an incorrect idea of the exit | |
3793 | * latency for the link state, and could start a device-initiated | |
3794 | * U1/U2 when the exit latencies are too high. | |
3795 | */ | |
3796 | if ((state == USB3_LPM_U1 && | |
3797 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3798 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3799 | (state == USB3_LPM_U2 && | |
3800 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3801 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3802 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3803 | usb3_lpm_names[state], u1_sel, u1_pel); |
3804 | return -EINVAL; | |
3805 | } | |
3806 | ||
3807 | /* | |
3808 | * If we're enabling device-initiated LPM for one link state, | |
3809 | * but the other link state has a too high SEL or PEL value, | |
3810 | * just set those values to the max in the Set SEL request. | |
3811 | */ | |
3812 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3813 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3814 | ||
3815 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3816 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3817 | ||
3818 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3819 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3820 | ||
3821 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3822 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3823 | ||
3824 | /* | |
3825 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3826 | * which may be initiated by an error path of a mass storage driver. | |
3827 | * Therefore, use GFP_NOIO. | |
3828 | */ | |
3829 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3830 | if (!sel_values) | |
3831 | return -ENOMEM; | |
3832 | ||
3833 | sel_values->u1_sel = u1_sel; | |
3834 | sel_values->u1_pel = u1_pel; | |
3835 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3836 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3837 | ||
3838 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3839 | USB_REQ_SET_SEL, | |
3840 | USB_RECIP_DEVICE, | |
3841 | 0, 0, | |
3842 | sel_values, sizeof *(sel_values), | |
3843 | USB_CTRL_SET_TIMEOUT); | |
3844 | kfree(sel_values); | |
3845 | return ret; | |
3846 | } | |
3847 | ||
3848 | /* | |
3849 | * Enable or disable device-initiated U1 or U2 transitions. | |
3850 | */ | |
3851 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3852 | enum usb3_link_state state, bool enable) | |
3853 | { | |
3854 | int ret; | |
3855 | int feature; | |
3856 | ||
3857 | switch (state) { | |
3858 | case USB3_LPM_U1: | |
3859 | feature = USB_DEVICE_U1_ENABLE; | |
3860 | break; | |
3861 | case USB3_LPM_U2: | |
3862 | feature = USB_DEVICE_U2_ENABLE; | |
3863 | break; | |
3864 | default: | |
3865 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3866 | __func__, enable ? "enable" : "disable"); | |
3867 | return -EINVAL; | |
3868 | } | |
3869 | ||
3870 | if (udev->state != USB_STATE_CONFIGURED) { | |
3871 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3872 | "for unconfigured device.\n", | |
3873 | __func__, enable ? "enable" : "disable", | |
3874 | usb3_lpm_names[state]); | |
3875 | return 0; | |
3876 | } | |
3877 | ||
3878 | if (enable) { | |
1ea7e0e8 SS |
3879 | /* |
3880 | * Now send the control transfer to enable device-initiated LPM | |
3881 | * for either U1 or U2. | |
3882 | */ | |
3883 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3884 | USB_REQ_SET_FEATURE, | |
3885 | USB_RECIP_DEVICE, | |
3886 | feature, | |
3887 | 0, NULL, 0, | |
3888 | USB_CTRL_SET_TIMEOUT); | |
3889 | } else { | |
3890 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3891 | USB_REQ_CLEAR_FEATURE, | |
3892 | USB_RECIP_DEVICE, | |
3893 | feature, | |
3894 | 0, NULL, 0, | |
3895 | USB_CTRL_SET_TIMEOUT); | |
3896 | } | |
3897 | if (ret < 0) { | |
3898 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3899 | enable ? "Enable" : "Disable", | |
3900 | usb3_lpm_names[state]); | |
3901 | return -EBUSY; | |
3902 | } | |
3903 | return 0; | |
3904 | } | |
3905 | ||
3906 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3907 | enum usb3_link_state state, int timeout) | |
3908 | { | |
3909 | int ret; | |
3910 | int feature; | |
3911 | ||
3912 | switch (state) { | |
3913 | case USB3_LPM_U1: | |
3914 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3915 | break; | |
3916 | case USB3_LPM_U2: | |
3917 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3918 | break; | |
3919 | default: | |
3920 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3921 | __func__); | |
3922 | return -EINVAL; | |
3923 | } | |
3924 | ||
3925 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3926 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3927 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3928 | "which is a reserved value.\n", | |
3929 | usb3_lpm_names[state], timeout); | |
3930 | return -EINVAL; | |
3931 | } | |
3932 | ||
3933 | ret = set_port_feature(udev->parent, | |
3934 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3935 | feature); | |
3936 | if (ret < 0) { | |
3937 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3938 | "error code %i\n", usb3_lpm_names[state], | |
3939 | timeout, ret); | |
3940 | return -EBUSY; | |
3941 | } | |
3942 | if (state == USB3_LPM_U1) | |
3943 | udev->u1_params.timeout = timeout; | |
3944 | else | |
3945 | udev->u2_params.timeout = timeout; | |
3946 | return 0; | |
3947 | } | |
3948 | ||
3949 | /* | |
3950 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3951 | * U1/U2 entry. | |
3952 | * | |
3953 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3954 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3955 | * will be successful. | |
3956 | * | |
3957 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3958 | * driver know about it. If that call fails, it should be harmless, and just | |
3959 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3960 | */ | |
3961 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3962 | enum usb3_link_state state) | |
3963 | { | |
65a95b75 | 3964 | int timeout, ret; |
ae8963ad SS |
3965 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3966 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3967 | ||
3968 | /* If the device says it doesn't have *any* exit latency to come out of | |
3969 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3970 | * state. | |
3971 | */ | |
3972 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3973 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3974 | return; | |
1ea7e0e8 | 3975 | |
65a95b75 SS |
3976 | /* |
3977 | * First, let the device know about the exit latencies | |
3978 | * associated with the link state we're about to enable. | |
3979 | */ | |
3980 | ret = usb_req_set_sel(udev, state); | |
3981 | if (ret < 0) { | |
3982 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3983 | usb3_lpm_names[state]); | |
3984 | return; | |
3985 | } | |
3986 | ||
1ea7e0e8 SS |
3987 | /* We allow the host controller to set the U1/U2 timeout internally |
3988 | * first, so that it can change its schedule to account for the | |
3989 | * additional latency to send data to a device in a lower power | |
3990 | * link state. | |
3991 | */ | |
3992 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3993 | ||
3994 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3995 | if (timeout == 0) | |
3996 | return; | |
3997 | ||
3998 | if (timeout < 0) { | |
3999 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
4000 | "xHCI error %i.\n", usb3_lpm_names[state], | |
4001 | timeout); | |
4002 | return; | |
4003 | } | |
4004 | ||
bf5ce5bf | 4005 | if (usb_set_lpm_timeout(udev, state, timeout)) { |
1ea7e0e8 SS |
4006 | /* If we can't set the parent hub U1/U2 timeout, |
4007 | * device-initiated LPM won't be allowed either, so let the xHCI | |
4008 | * host know that this link state won't be enabled. | |
4009 | */ | |
4010 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
bf5ce5bf LB |
4011 | } else { |
4012 | /* Only a configured device will accept the Set Feature | |
4013 | * U1/U2_ENABLE | |
4014 | */ | |
4015 | if (udev->actconfig) | |
4016 | usb_set_device_initiated_lpm(udev, state, true); | |
4017 | ||
4018 | /* As soon as usb_set_lpm_timeout(timeout) returns 0, the | |
4019 | * hub-initiated LPM is enabled. Thus, LPM is enabled no | |
4020 | * matter the result of usb_set_device_initiated_lpm(). | |
4021 | * The only difference is whether device is able to initiate | |
4022 | * LPM. | |
4023 | */ | |
4024 | if (state == USB3_LPM_U1) | |
4025 | udev->usb3_lpm_u1_enabled = 1; | |
4026 | else if (state == USB3_LPM_U2) | |
4027 | udev->usb3_lpm_u2_enabled = 1; | |
4028 | } | |
1ea7e0e8 SS |
4029 | } |
4030 | ||
4031 | /* | |
4032 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
4033 | * U1/U2 entry. | |
4034 | * | |
4035 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
4036 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
4037 | * | |
4038 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
4039 | * it won't have an effect on the bus link state because the parent hub will | |
4040 | * still disallow device-initiated U1/U2 entry. | |
4041 | * | |
4042 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
4043 | * possible. The result will be slightly more bus bandwidth will be taken up | |
4044 | * (to account for U1/U2 exit latency), but it should be harmless. | |
4045 | */ | |
4046 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
4047 | enum usb3_link_state state) | |
4048 | { | |
1ea7e0e8 SS |
4049 | switch (state) { |
4050 | case USB3_LPM_U1: | |
1ea7e0e8 | 4051 | case USB3_LPM_U2: |
1ea7e0e8 SS |
4052 | break; |
4053 | default: | |
4054 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
4055 | __func__); | |
4056 | return -EINVAL; | |
4057 | } | |
4058 | ||
4059 | if (usb_set_lpm_timeout(udev, state, 0)) | |
4060 | return -EBUSY; | |
4061 | ||
4062 | usb_set_device_initiated_lpm(udev, state, false); | |
4063 | ||
4064 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
4065 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
4066 | "bus schedule bandwidth may be impacted.\n", | |
4067 | usb3_lpm_names[state]); | |
bf5ce5bf LB |
4068 | |
4069 | /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM | |
4070 | * is disabled. Hub will disallows link to enter U1/U2 as well, | |
4071 | * even device is initiating LPM. Hence LPM is disabled if hub LPM | |
4072 | * timeout set to 0, no matter device-initiated LPM is disabled or | |
4073 | * not. | |
4074 | */ | |
4075 | if (state == USB3_LPM_U1) | |
4076 | udev->usb3_lpm_u1_enabled = 0; | |
4077 | else if (state == USB3_LPM_U2) | |
4078 | udev->usb3_lpm_u2_enabled = 0; | |
4079 | ||
1ea7e0e8 SS |
4080 | return 0; |
4081 | } | |
4082 | ||
4083 | /* | |
4084 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
4085 | * Caller must own the bandwidth_mutex. | |
4086 | * | |
4087 | * This will call usb_enable_lpm() on failure, which will decrement | |
4088 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
4089 | */ | |
4090 | int usb_disable_lpm(struct usb_device *udev) | |
4091 | { | |
4092 | struct usb_hcd *hcd; | |
4093 | ||
4094 | if (!udev || !udev->parent || | |
8a1b2725 | 4095 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
4096 | !udev->lpm_capable || |
4097 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4098 | return 0; |
4099 | ||
4100 | hcd = bus_to_hcd(udev->bus); | |
4101 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
4102 | return 0; | |
4103 | ||
4104 | udev->lpm_disable_count++; | |
55558c33 | 4105 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
4106 | return 0; |
4107 | ||
4108 | /* If LPM is enabled, attempt to disable it. */ | |
4109 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
4110 | goto enable_lpm; | |
4111 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
4112 | goto enable_lpm; | |
4113 | ||
4114 | return 0; | |
4115 | ||
4116 | enable_lpm: | |
4117 | usb_enable_lpm(udev); | |
4118 | return -EBUSY; | |
4119 | } | |
4120 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
4121 | ||
4122 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
4123 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4124 | { | |
4125 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4126 | int ret; | |
4127 | ||
4128 | if (!hcd) | |
4129 | return -EINVAL; | |
4130 | ||
4131 | mutex_lock(hcd->bandwidth_mutex); | |
4132 | ret = usb_disable_lpm(udev); | |
4133 | mutex_unlock(hcd->bandwidth_mutex); | |
4134 | ||
4135 | return ret; | |
4136 | } | |
4137 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
4138 | ||
4139 | /* | |
4140 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
4141 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
4142 | * | |
4143 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
4144 | * until the lpm_disable_count drops to zero. Caller must own the | |
4145 | * bandwidth_mutex. | |
4146 | */ | |
4147 | void usb_enable_lpm(struct usb_device *udev) | |
4148 | { | |
4149 | struct usb_hcd *hcd; | |
513072d9 LB |
4150 | struct usb_hub *hub; |
4151 | struct usb_port *port_dev; | |
1ea7e0e8 SS |
4152 | |
4153 | if (!udev || !udev->parent || | |
8a1b2725 | 4154 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
4155 | !udev->lpm_capable || |
4156 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4157 | return; |
4158 | ||
4159 | udev->lpm_disable_count--; | |
4160 | hcd = bus_to_hcd(udev->bus); | |
4161 | /* Double check that we can both enable and disable LPM. | |
4162 | * Device must be configured to accept set feature U1/U2 timeout. | |
4163 | */ | |
4164 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
4165 | !hcd->driver->disable_usb3_lpm_timeout) | |
4166 | return; | |
4167 | ||
4168 | if (udev->lpm_disable_count > 0) | |
4169 | return; | |
4170 | ||
513072d9 LB |
4171 | hub = usb_hub_to_struct_hub(udev->parent); |
4172 | if (!hub) | |
4173 | return; | |
4174 | ||
4175 | port_dev = hub->ports[udev->portnum - 1]; | |
4176 | ||
4177 | if (port_dev->usb3_lpm_u1_permit) | |
4178 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
4179 | ||
4180 | if (port_dev->usb3_lpm_u2_permit) | |
4181 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
1ea7e0e8 SS |
4182 | } |
4183 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
4184 | ||
4185 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
4186 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
4187 | { | |
4188 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4189 | ||
4190 | if (!hcd) | |
4191 | return; | |
4192 | ||
4193 | mutex_lock(hcd->bandwidth_mutex); | |
4194 | usb_enable_lpm(udev); | |
4195 | mutex_unlock(hcd->bandwidth_mutex); | |
4196 | } | |
4197 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
4198 | ||
37be6676 MN |
4199 | /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ |
4200 | static void hub_usb3_port_prepare_disable(struct usb_hub *hub, | |
4201 | struct usb_port *port_dev) | |
4202 | { | |
4203 | struct usb_device *udev = port_dev->child; | |
4204 | int ret; | |
4205 | ||
4206 | if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { | |
4207 | ret = hub_set_port_link_state(hub, port_dev->portnum, | |
4208 | USB_SS_PORT_LS_U0); | |
4209 | if (!ret) { | |
4210 | msleep(USB_RESUME_TIMEOUT); | |
4211 | ret = usb_disable_remote_wakeup(udev); | |
4212 | } | |
4213 | if (ret) | |
4214 | dev_warn(&udev->dev, | |
4215 | "Port disable: can't disable remote wake\n"); | |
4216 | udev->do_remote_wakeup = 0; | |
4217 | } | |
4218 | } | |
1ea7e0e8 | 4219 | |
d388dab7 AS |
4220 | #else /* CONFIG_PM */ |
4221 | ||
f07600cf AS |
4222 | #define hub_suspend NULL |
4223 | #define hub_resume NULL | |
4224 | #define hub_reset_resume NULL | |
1ea7e0e8 | 4225 | |
37be6676 MN |
4226 | static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, |
4227 | struct usb_port *port_dev) { } | |
4228 | ||
1ea7e0e8 SS |
4229 | int usb_disable_lpm(struct usb_device *udev) |
4230 | { | |
4231 | return 0; | |
4232 | } | |
e9261fb6 | 4233 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
4234 | |
4235 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4236 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
4237 | |
4238 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4239 | { | |
4240 | return 0; | |
4241 | } | |
e9261fb6 | 4242 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
4243 | |
4244 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4245 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
4246 | |
4247 | int usb_disable_ltm(struct usb_device *udev) | |
4248 | { | |
4249 | return 0; | |
4250 | } | |
4251 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
4252 | ||
4253 | void usb_enable_ltm(struct usb_device *udev) { } | |
4254 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 | 4255 | |
4a95b1fc SR |
4256 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
4257 | u16 portstatus, u16 portchange) | |
4258 | { | |
4259 | return 0; | |
4260 | } | |
4261 | ||
c4b51a43 | 4262 | #endif /* CONFIG_PM */ |
d388dab7 | 4263 | |
3bc02bce GU |
4264 | /* |
4265 | * USB-3 does not have a similar link state as USB-2 that will avoid negotiating | |
4266 | * a connection with a plugged-in cable but will signal the host when the cable | |
4267 | * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices | |
4268 | */ | |
4269 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) | |
4270 | { | |
4271 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
4272 | struct usb_device *hdev = hub->hdev; | |
4273 | int ret = 0; | |
4274 | ||
4275 | if (!hub->error) { | |
4276 | if (hub_is_superspeed(hub->hdev)) { | |
4277 | hub_usb3_port_prepare_disable(hub, port_dev); | |
4278 | ret = hub_set_port_link_state(hub, port_dev->portnum, | |
4279 | USB_SS_PORT_LS_U3); | |
4280 | } else { | |
4281 | ret = usb_clear_port_feature(hdev, port1, | |
4282 | USB_PORT_FEAT_ENABLE); | |
4283 | } | |
4284 | } | |
4285 | if (port_dev->child && set_state) | |
4286 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); | |
4287 | if (ret && ret != -ENODEV) | |
4288 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); | |
4289 | return ret; | |
4290 | } | |
4291 | ||
8dd8d2c9 DD |
4292 | /* |
4293 | * usb_port_disable - disable a usb device's upstream port | |
4294 | * @udev: device to disable | |
4295 | * Context: @udev locked, must be able to sleep. | |
4296 | * | |
4297 | * Disables a USB device that isn't in active use. | |
4298 | */ | |
4299 | int usb_port_disable(struct usb_device *udev) | |
4300 | { | |
4301 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); | |
4302 | ||
4303 | return hub_port_disable(hub, udev->portnum, 0); | |
4304 | } | |
1da177e4 LT |
4305 | |
4306 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
4307 | * | |
4308 | * Between connect detection and reset signaling there must be a delay | |
4309 | * of 100ms at least for debounce and power-settling. The corresponding | |
4310 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 4311 | * |
1da177e4 LT |
4312 | * Apparently there are some bluetooth and irda-dongles and a number of |
4313 | * low-speed devices for which this debounce period may last over a second. | |
4314 | * Not covered by the spec - but easy to deal with. | |
4315 | * | |
4316 | * This implementation uses a 1500ms total debounce timeout; if the | |
4317 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
4318 | * every 25ms for transient disconnects. When the port status has been | |
4319 | * unchanged for 100ms it returns the port status. | |
4320 | */ | |
ad493e5e | 4321 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
4322 | { |
4323 | int ret; | |
1da177e4 LT |
4324 | u16 portchange, portstatus; |
4325 | unsigned connection = 0xffff; | |
d99f6b41 DW |
4326 | int total_time, stable_time = 0; |
4327 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
1da177e4 LT |
4328 | |
4329 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
4330 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
4331 | if (ret < 0) | |
4332 | return ret; | |
4333 | ||
4334 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
4335 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
4336 | if (!must_be_connected || |
4337 | (connection == USB_PORT_STAT_CONNECTION)) | |
4338 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
4339 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
4340 | break; | |
4341 | } else { | |
4342 | stable_time = 0; | |
4343 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
4344 | } | |
4345 | ||
4346 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 4347 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
4348 | USB_PORT_FEAT_C_CONNECTION); |
4349 | } | |
4350 | ||
4351 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
4352 | break; | |
4353 | msleep(HUB_DEBOUNCE_STEP); | |
4354 | } | |
4355 | ||
d99f6b41 DW |
4356 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
4357 | total_time, stable_time, portstatus); | |
1da177e4 LT |
4358 | |
4359 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
4360 | return -ETIMEDOUT; | |
4361 | return portstatus; | |
4362 | } | |
4363 | ||
fc721f51 | 4364 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 4365 | { |
ddeac4e7 AS |
4366 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
4367 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 4368 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 4369 | } |
fc721f51 | 4370 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
4371 | |
4372 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
4373 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
4374 | ||
4326ed0b | 4375 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
4376 | { |
4377 | int retval; | |
c6515272 | 4378 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 4379 | |
c6515272 SS |
4380 | /* |
4381 | * The host controller will choose the device address, | |
4382 | * instead of the core having chosen it earlier | |
4383 | */ | |
4384 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
4385 | return -EINVAL; |
4386 | if (udev->state == USB_STATE_ADDRESS) | |
4387 | return 0; | |
4388 | if (udev->state != USB_STATE_DEFAULT) | |
4389 | return -EINVAL; | |
c8d4af8e | 4390 | if (hcd->driver->address_device) |
c6515272 | 4391 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 4392 | else |
c6515272 SS |
4393 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
4394 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
4395 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 4396 | if (retval == 0) { |
3b29b68b | 4397 | update_devnum(udev, devnum); |
4953d141 | 4398 | /* Device now using proper address. */ |
1da177e4 | 4399 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 4400 | usb_ep0_reinit(udev); |
1da177e4 LT |
4401 | } |
4402 | return retval; | |
4403 | } | |
4404 | ||
890dae88 MN |
4405 | /* |
4406 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
4407 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
4408 | * enabled. | |
4409 | * | |
4410 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
4411 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
4412 | * support bit in the BOS descriptor. | |
4413 | */ | |
4414 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
4415 | { | |
d99f6b41 DW |
4416 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
4417 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; | |
890dae88 | 4418 | |
7b2db29f | 4419 | if (!udev->usb2_hw_lpm_capable || !udev->bos) |
890dae88 MN |
4420 | return; |
4421 | ||
d99f6b41 DW |
4422 | if (hub) |
4423 | connect_type = hub->ports[udev->portnum - 1]->connect_type; | |
890dae88 | 4424 | |
23c05820 | 4425 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
4426 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
4427 | udev->usb2_hw_lpm_allowed = 1; | |
4428 | usb_set_usb2_hardware_lpm(udev, 1); | |
4429 | } | |
4430 | } | |
4431 | ||
48fc7dbd DW |
4432 | static int hub_enable_device(struct usb_device *udev) |
4433 | { | |
4434 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4435 | ||
4436 | if (!hcd->driver->enable_device) | |
4437 | return 0; | |
4438 | if (udev->state == USB_STATE_ADDRESS) | |
4439 | return 0; | |
4440 | if (udev->state != USB_STATE_DEFAULT) | |
4441 | return -EINVAL; | |
4442 | ||
4443 | return hcd->driver->enable_device(hcd, udev); | |
4444 | } | |
4445 | ||
1da177e4 LT |
4446 | /* Reset device, (re)assign address, get device descriptor. |
4447 | * Device connection must be stable, no more debouncing needed. | |
4448 | * Returns device in USB_STATE_ADDRESS, except on error. | |
4449 | * | |
4450 | * If this is called for an already-existing device (as part of | |
5c79a1e3 DW |
4451 | * usb_reset_and_verify_device), the caller must own the device lock and |
4452 | * the port lock. For a newly detected device that is not accessible | |
4453 | * through any global pointers, it's not necessary to lock the device, | |
4454 | * but it is still necessary to lock the port. | |
1da177e4 LT |
4455 | */ |
4456 | static int | |
039b3307 | 4457 | hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, |
1da177e4 LT |
4458 | int retry_counter) |
4459 | { | |
1da177e4 | 4460 | struct usb_device *hdev = hub->hdev; |
e7b77172 | 4461 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
25244227 | 4462 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
0d5ce778 | 4463 | int retries, operations, retval, i; |
1da177e4 LT |
4464 | unsigned delay = HUB_SHORT_RESET_TIME; |
4465 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4466 | const char *speed; |
4326ed0b | 4467 | int devnum = udev->devnum; |
1bb90cf0 | 4468 | const char *driver_name; |
1da177e4 LT |
4469 | |
4470 | /* root hub ports have a slightly longer reset period | |
4471 | * (from USB 2.0 spec, section 7.1.7.5) | |
4472 | */ | |
4473 | if (!hdev->parent) { | |
4474 | delay = HUB_ROOT_RESET_TIME; | |
4475 | if (port1 == hdev->bus->otg_port) | |
4476 | hdev->bus->b_hnp_enable = 0; | |
4477 | } | |
4478 | ||
4479 | /* Some low speed devices have problems with the quick delay, so */ | |
4480 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4481 | if (oldspeed == USB_SPEED_LOW) | |
4482 | delay = HUB_LONG_RESET_TIME; | |
4483 | ||
feb26ac3 | 4484 | mutex_lock(hcd->address0_mutex); |
1da177e4 | 4485 | |
07194ab7 LT |
4486 | /* Reset the device; full speed may morph to high speed */ |
4487 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4488 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4489 | if (retval < 0) /* error or disconnect */ |
4490 | goto fail; | |
4491 | /* success, speed is known */ | |
4492 | ||
1da177e4 LT |
4493 | retval = -ENODEV; |
4494 | ||
8a1b2725 MN |
4495 | /* Don't allow speed changes at reset, except usb 3.0 to faster */ |
4496 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && | |
4497 | !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { | |
1da177e4 LT |
4498 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
4499 | goto fail; | |
4500 | } | |
4501 | oldspeed = udev->speed; | |
4326ed0b | 4502 | |
1da177e4 LT |
4503 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4504 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4505 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4506 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4507 | */ |
4508 | switch (udev->speed) { | |
8a1b2725 | 4509 | case USB_SPEED_SUPER_PLUS: |
6b403b02 | 4510 | case USB_SPEED_SUPER: |
551cdbbe | 4511 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4512 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4513 | break; |
1da177e4 | 4514 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4515 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4516 | break; |
4517 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4518 | /* to determine the ep0 maxpacket size, try to read | |
4519 | * the device descriptor to get bMaxPacketSize0 and | |
4520 | * then correct our initial guess. | |
4521 | */ | |
551509d2 | 4522 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4523 | break; |
4524 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4525 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4526 | break; |
4527 | default: | |
4528 | goto fail; | |
4529 | } | |
e538dfda MN |
4530 | |
4531 | if (udev->speed == USB_SPEED_WIRELESS) | |
4532 | speed = "variable speed Wireless"; | |
4533 | else | |
4534 | speed = usb_speed_string(udev->speed); | |
4535 | ||
1bb90cf0 PC |
4536 | /* |
4537 | * The controller driver may be NULL if the controller device | |
4538 | * is the middle device between platform device and roothub. | |
4539 | * This middle device may not need a device driver due to | |
4540 | * all hardware control can be at platform device driver, this | |
4541 | * platform device is usually a dual-role USB controller device. | |
4542 | */ | |
4543 | if (udev->bus->controller->driver) | |
4544 | driver_name = udev->bus->controller->driver->name; | |
4545 | else | |
4546 | driver_name = udev->bus->sysdev->driver->name; | |
4547 | ||
8a1b2725 | 4548 | if (udev->speed < USB_SPEED_SUPER) |
c6515272 | 4549 | dev_info(&udev->dev, |
e538dfda MN |
4550 | "%s %s USB device number %d using %s\n", |
4551 | (udev->config) ? "reset" : "new", speed, | |
1bb90cf0 | 4552 | devnum, driver_name); |
1da177e4 LT |
4553 | |
4554 | /* Set up TT records, if needed */ | |
4555 | if (hdev->tt) { | |
4556 | udev->tt = hdev->tt; | |
4557 | udev->ttport = hdev->ttport; | |
4558 | } else if (udev->speed != USB_SPEED_HIGH | |
4559 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4560 | if (!hub->tt.hub) { |
4561 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4562 | retval = -EINVAL; | |
4563 | goto fail; | |
4564 | } | |
1da177e4 LT |
4565 | udev->tt = &hub->tt; |
4566 | udev->ttport = port1; | |
4567 | } | |
469271f8 | 4568 | |
1da177e4 LT |
4569 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4570 | * Because device hardware and firmware is sometimes buggy in | |
4571 | * this area, and this is how Linux has done it for ages. | |
4572 | * Change it cautiously. | |
4573 | * | |
48fc7dbd | 4574 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4575 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4576 | * so it may help with some non-standards-compliant devices. | |
4577 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4578 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4579 | * value. | |
4580 | */ | |
0d5ce778 | 4581 | for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { |
48fc7dbd DW |
4582 | bool did_new_scheme = false; |
4583 | ||
25244227 | 4584 | if (use_new_scheme(udev, retry_counter, port_dev)) { |
1da177e4 LT |
4585 | struct usb_device_descriptor *buf; |
4586 | int r = 0; | |
4587 | ||
48fc7dbd DW |
4588 | did_new_scheme = true; |
4589 | retval = hub_enable_device(udev); | |
938569eb ON |
4590 | if (retval < 0) { |
4591 | dev_err(&udev->dev, | |
4592 | "hub failed to enable device, error %d\n", | |
4593 | retval); | |
48fc7dbd | 4594 | goto fail; |
938569eb | 4595 | } |
48fc7dbd | 4596 | |
1da177e4 LT |
4597 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4598 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4599 | if (!buf) { | |
4600 | retval = -ENOMEM; | |
4601 | continue; | |
4602 | } | |
4603 | ||
b89ee19a AS |
4604 | /* Retry on all errors; some devices are flakey. |
4605 | * 255 is for WUSB devices, we actually need to use | |
4606 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 | 4607 | */ |
0d5ce778 | 4608 | for (operations = 0; operations < 3; ++operations) { |
1da177e4 LT |
4609 | buf->bMaxPacketSize0 = 0; |
4610 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4611 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4612 | USB_DT_DEVICE << 8, 0, | |
4613 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4614 | initial_descriptor_timeout); |
1da177e4 | 4615 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4616 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4617 | if (buf->bDescriptorType == |
4618 | USB_DT_DEVICE) { | |
4619 | r = 0; | |
4620 | break; | |
4621 | } | |
4622 | /* FALL THROUGH */ | |
4623 | default: | |
4624 | if (r == 0) | |
4625 | r = -EPROTO; | |
4626 | break; | |
4627 | } | |
264904cc ON |
4628 | /* |
4629 | * Some devices time out if they are powered on | |
4630 | * when already connected. They need a second | |
4631 | * reset. But only on the first attempt, | |
4632 | * lest we get into a time out/reset loop | |
4633 | */ | |
6e01827e MM |
4634 | if (r == 0 || (r == -ETIMEDOUT && |
4635 | retries == 0 && | |
4636 | udev->speed > USB_SPEED_FULL)) | |
1da177e4 LT |
4637 | break; |
4638 | } | |
4639 | udev->descriptor.bMaxPacketSize0 = | |
4640 | buf->bMaxPacketSize0; | |
4641 | kfree(buf); | |
4642 | ||
75d7cf72 | 4643 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4644 | if (retval < 0) /* error or disconnect */ |
4645 | goto fail; | |
4646 | if (oldspeed != udev->speed) { | |
4647 | dev_dbg(&udev->dev, | |
4648 | "device reset changed speed!\n"); | |
4649 | retval = -ENODEV; | |
4650 | goto fail; | |
4651 | } | |
4652 | if (r) { | |
e9e88fb7 AS |
4653 | if (r != -ENODEV) |
4654 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4655 | r); | |
1da177e4 LT |
4656 | retval = -EMSGSIZE; |
4657 | continue; | |
4658 | } | |
4659 | #undef GET_DESCRIPTOR_BUFSIZE | |
4660 | } | |
4661 | ||
469271f8 MB |
4662 | /* |
4663 | * If device is WUSB, we already assigned an | |
4664 | * unauthorized address in the Connect Ack sequence; | |
4665 | * authorization will assign the final address. | |
4666 | */ | |
c6515272 | 4667 | if (udev->wusb == 0) { |
0d5ce778 | 4668 | for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { |
6c529cdc IPG |
4669 | retval = hub_set_address(udev, devnum); |
4670 | if (retval >= 0) | |
4671 | break; | |
4672 | msleep(200); | |
4673 | } | |
4674 | if (retval < 0) { | |
e9e88fb7 AS |
4675 | if (retval != -ENODEV) |
4676 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4677 | devnum, retval); | |
6c529cdc IPG |
4678 | goto fail; |
4679 | } | |
8a1b2725 | 4680 | if (udev->speed >= USB_SPEED_SUPER) { |
c6515272 SS |
4681 | devnum = udev->devnum; |
4682 | dev_info(&udev->dev, | |
45455e4d | 4683 | "%s SuperSpeed%s%s USB device number %d using %s\n", |
c6515272 | 4684 | (udev->config) ? "reset" : "new", |
45455e4d MN |
4685 | (udev->speed == USB_SPEED_SUPER_PLUS) ? |
4686 | "Plus Gen 2" : " Gen 1", | |
4687 | (udev->rx_lanes == 2 && udev->tx_lanes == 2) ? | |
4688 | "x2" : "", | |
1bb90cf0 | 4689 | devnum, driver_name); |
c6515272 | 4690 | } |
6c529cdc IPG |
4691 | |
4692 | /* cope with hardware quirkiness: | |
4693 | * - let SET_ADDRESS settle, some device hardware wants it | |
4694 | * - read ep0 maxpacket even for high and low speed, | |
4695 | */ | |
4696 | msleep(10); | |
48fc7dbd DW |
4697 | /* use_new_scheme() checks the speed which may have |
4698 | * changed since the initial look so we cache the result | |
4699 | * in did_new_scheme | |
4700 | */ | |
4701 | if (did_new_scheme) | |
1da177e4 | 4702 | break; |
469271f8 | 4703 | } |
1da177e4 LT |
4704 | |
4705 | retval = usb_get_device_descriptor(udev, 8); | |
4706 | if (retval < 8) { | |
e9e88fb7 AS |
4707 | if (retval != -ENODEV) |
4708 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4709 | "device descriptor read/8, error %d\n", |
4710 | retval); | |
1da177e4 LT |
4711 | if (retval >= 0) |
4712 | retval = -EMSGSIZE; | |
4713 | } else { | |
886ee36e FB |
4714 | u32 delay; |
4715 | ||
1da177e4 | 4716 | retval = 0; |
886ee36e FB |
4717 | |
4718 | delay = udev->parent->hub_delay; | |
4719 | udev->hub_delay = min_t(u32, delay, | |
4720 | USB_TP_TRANSMISSION_DELAY_MAX); | |
4721 | retval = usb_set_isoch_delay(udev); | |
4722 | if (retval) { | |
4723 | dev_dbg(&udev->dev, | |
4724 | "Failed set isoch delay, error %d\n", | |
4725 | retval); | |
4726 | retval = 0; | |
4727 | } | |
1da177e4 LT |
4728 | break; |
4729 | } | |
4730 | } | |
4731 | if (retval) | |
4732 | goto fail; | |
4733 | ||
d8aec3db EF |
4734 | /* |
4735 | * Some superspeed devices have finished the link training process | |
4736 | * and attached to a superspeed hub port, but the device descriptor | |
4737 | * got from those devices show they aren't superspeed devices. Warm | |
4738 | * reset the port attached by the devices can fix them. | |
4739 | */ | |
8a1b2725 | 4740 | if ((udev->speed >= USB_SPEED_SUPER) && |
d8aec3db EF |
4741 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
4742 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4743 | "warm reset device\n"); | |
4744 | hub_port_reset(hub, port1, udev, | |
4745 | HUB_BH_RESET_TIME, true); | |
4746 | retval = -EINVAL; | |
4747 | goto fail; | |
4748 | } | |
4749 | ||
6b403b02 | 4750 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
8a1b2725 | 4751 | udev->speed >= USB_SPEED_SUPER) |
6b403b02 SS |
4752 | i = 512; |
4753 | else | |
4754 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4755 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4756 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4757 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4758 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4759 | retval = -EMSGSIZE; |
4760 | goto fail; | |
4761 | } | |
56626a72 AS |
4762 | if (udev->speed == USB_SPEED_FULL) |
4763 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4764 | else | |
4765 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4766 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4767 | usb_ep0_reinit(udev); |
1da177e4 | 4768 | } |
469271f8 | 4769 | |
1da177e4 LT |
4770 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4771 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4772 | if (retval != -ENODEV) |
4773 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4774 | retval); | |
1da177e4 LT |
4775 | if (retval >= 0) |
4776 | retval = -ENOMSG; | |
4777 | goto fail; | |
4778 | } | |
4779 | ||
ad87e032 AS |
4780 | usb_detect_quirks(udev); |
4781 | ||
1ff4df56 AX |
4782 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4783 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4784 | if (!retval) { |
d9b2099c | 4785 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4786 | usb_set_lpm_parameters(udev); |
4787 | } | |
1ff4df56 | 4788 | } |
3148bf04 | 4789 | |
1da177e4 | 4790 | retval = 0; |
48f24970 AD |
4791 | /* notify HCD that we have a device connected and addressed */ |
4792 | if (hcd->driver->update_device) | |
4793 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4794 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4795 | fail: |
4326ed0b | 4796 | if (retval) { |
1da177e4 | 4797 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4798 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4799 | } |
feb26ac3 | 4800 | mutex_unlock(hcd->address0_mutex); |
1da177e4 LT |
4801 | return retval; |
4802 | } | |
4803 | ||
4804 | static void | |
039b3307 | 4805 | check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) |
1da177e4 LT |
4806 | { |
4807 | struct usb_qualifier_descriptor *qual; | |
4808 | int status; | |
4809 | ||
2a159389 JH |
4810 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
4811 | return; | |
4812 | ||
039b3307 | 4813 | qual = kmalloc(sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4814 | if (qual == NULL) |
4815 | return; | |
4816 | ||
039b3307 | 4817 | status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, |
1da177e4 LT |
4818 | qual, sizeof *qual); |
4819 | if (status == sizeof *qual) { | |
4820 | dev_info(&udev->dev, "not running at top speed; " | |
4821 | "connect to a high speed hub\n"); | |
4822 | /* hub LEDs are probably harder to miss than syslog */ | |
4823 | if (hub->has_indicators) { | |
4824 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4825 | queue_delayed_work(system_power_efficient_wq, |
4826 | &hub->leds, 0); | |
1da177e4 LT |
4827 | } |
4828 | } | |
1bc3c9e1 | 4829 | kfree(qual); |
1da177e4 LT |
4830 | } |
4831 | ||
4832 | static unsigned | |
039b3307 | 4833 | hub_power_remaining(struct usb_hub *hub) |
1da177e4 LT |
4834 | { |
4835 | struct usb_device *hdev = hub->hdev; | |
4836 | int remaining; | |
55c52718 | 4837 | int port1; |
1da177e4 | 4838 | |
55c52718 | 4839 | if (!hub->limited_power) |
1da177e4 LT |
4840 | return 0; |
4841 | ||
55c52718 AS |
4842 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4843 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
4844 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4845 | struct usb_device *udev = port_dev->child; | |
4846 | unsigned unit_load; | |
4847 | int delta; | |
1da177e4 LT |
4848 | |
4849 | if (!udev) | |
4850 | continue; | |
430ee58e SAS |
4851 | if (hub_is_superspeed(udev)) |
4852 | unit_load = 150; | |
4853 | else | |
4854 | unit_load = 100; | |
1da177e4 | 4855 | |
430ee58e SAS |
4856 | /* |
4857 | * Unconfigured devices may not use more than one unit load, | |
4858 | * or 8mA for OTG ports | |
4859 | */ | |
1da177e4 | 4860 | if (udev->actconfig) |
8d8479db | 4861 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4862 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4863 | delta = unit_load; |
1da177e4 | 4864 | else |
55c52718 AS |
4865 | delta = 8; |
4866 | if (delta > hub->mA_per_port) | |
d99f6b41 DW |
4867 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
4868 | delta, hub->mA_per_port); | |
1da177e4 LT |
4869 | remaining -= delta; |
4870 | } | |
4871 | if (remaining < 0) { | |
55c52718 | 4872 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4873 | -remaining); |
1da177e4 LT |
4874 | remaining = 0; |
4875 | } | |
4876 | return remaining; | |
4877 | } | |
4878 | ||
af376a46 DW |
4879 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
4880 | u16 portchange) | |
1da177e4 | 4881 | { |
94c43b98 AS |
4882 | int status = -ENODEV; |
4883 | int i; | |
430ee58e | 4884 | unsigned unit_load; |
1da177e4 | 4885 | struct usb_device *hdev = hub->hdev; |
90da096e | 4886 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
d99f6b41 | 4887 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
af376a46 | 4888 | struct usb_device *udev = port_dev->child; |
5ee0f803 | 4889 | static int unreliable_port = -1; |
8808f00c | 4890 | |
24618b0c | 4891 | /* Disconnect any existing devices under this port */ |
b76baa81 | 4892 | if (udev) { |
b2108f1e | 4893 | if (hcd->usb_phy && !hdev->parent) |
3d46e73d | 4894 | usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); |
d99f6b41 | 4895 | usb_disconnect(&port_dev->child); |
b76baa81 | 4896 | } |
24618b0c | 4897 | |
253e0572 AS |
4898 | /* We can forget about a "removed" device when there's a physical |
4899 | * disconnect or the connect status changes. | |
4900 | */ | |
4901 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4902 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4903 | clear_bit(port1, hub->removed_bits); | |
4904 | ||
5257d97a AS |
4905 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4906 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4907 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4908 | if (status < 0) { |
5ee0f803 ON |
4909 | if (status != -ENODEV && |
4910 | port1 != unreliable_port && | |
4911 | printk_ratelimit()) | |
dd5f5006 | 4912 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
5257d97a | 4913 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
5ee0f803 | 4914 | unreliable_port = port1; |
5257d97a AS |
4915 | } else { |
4916 | portstatus = status; | |
4917 | } | |
4918 | } | |
4919 | ||
253e0572 AS |
4920 | /* Return now if debouncing failed or nothing is connected or |
4921 | * the device was "removed". | |
4922 | */ | |
4923 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4924 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 | 4925 | |
fbaecff0 DD |
4926 | /* |
4927 | * maybe switch power back on (e.g. root hub was reset) | |
4928 | * but only if the port isn't owned by someone else. | |
4929 | */ | |
9262c19d | 4930 | if (hub_is_port_power_switchable(hub) |
fbaecff0 DD |
4931 | && !port_is_power_on(hub, portstatus) |
4932 | && !port_dev->port_owner) | |
1da177e4 | 4933 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4934 | |
1da177e4 | 4935 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4936 | goto done; |
1da177e4 LT |
4937 | return; |
4938 | } | |
430ee58e SAS |
4939 | if (hub_is_superspeed(hub->hdev)) |
4940 | unit_load = 150; | |
4941 | else | |
4942 | unit_load = 100; | |
1da177e4 | 4943 | |
e9e88fb7 | 4944 | status = 0; |
1da177e4 | 4945 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4946 | |
4947 | /* reallocate for each attempt, since references | |
4948 | * to the previous one can escape in various ways | |
4949 | */ | |
4950 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4951 | if (!udev) { | |
d99f6b41 DW |
4952 | dev_err(&port_dev->dev, |
4953 | "couldn't allocate usb_device\n"); | |
1da177e4 LT |
4954 | goto done; |
4955 | } | |
4956 | ||
4957 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4958 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4959 | udev->level = hdev->level + 1; |
8af548dc | 4960 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4961 | |
8a1b2725 | 4962 | /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ |
131dec34 | 4963 | if (hub_is_superspeed(hub->hdev)) |
e7b77172 SS |
4964 | udev->speed = USB_SPEED_SUPER; |
4965 | else | |
4966 | udev->speed = USB_SPEED_UNKNOWN; | |
4967 | ||
3b29b68b | 4968 | choose_devnum(udev); |
c8d4af8e AX |
4969 | if (udev->devnum <= 0) { |
4970 | status = -ENOTCONN; /* Don't retry */ | |
4971 | goto loop; | |
c6515272 SS |
4972 | } |
4973 | ||
e7b77172 | 4974 | /* reset (non-USB 3.0 devices) and get descriptor */ |
5c79a1e3 | 4975 | usb_lock_port(port_dev); |
1da177e4 | 4976 | status = hub_port_init(hub, udev, port1, i); |
5c79a1e3 | 4977 | usb_unlock_port(port_dev); |
1da177e4 LT |
4978 | if (status < 0) |
4979 | goto loop; | |
4980 | ||
93362a87 | 4981 | if (udev->quirks & USB_QUIRK_DELAY_INIT) |
b2a542bb | 4982 | msleep(2000); |
93362a87 | 4983 | |
1da177e4 LT |
4984 | /* consecutive bus-powered hubs aren't reliable; they can |
4985 | * violate the voltage drop budget. if the new child has | |
4986 | * a "powered" LED, users should notice we didn't enable it | |
4987 | * (without reading syslog), even without per-port LEDs | |
4988 | * on the parent. | |
4989 | */ | |
4990 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4991 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4992 | u16 devstat; |
4993 | ||
d9e1e148 | 4994 | status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, |
1da177e4 | 4995 | &devstat); |
15b7336e | 4996 | if (status) { |
1da177e4 LT |
4997 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4998 | goto loop_disable; | |
4999 | } | |
1da177e4 LT |
5000 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
5001 | dev_err(&udev->dev, | |
5002 | "can't connect bus-powered hub " | |
5003 | "to this port\n"); | |
5004 | if (hub->has_indicators) { | |
5005 | hub->indicator[port1-1] = | |
5006 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
5007 | queue_delayed_work( |
5008 | system_power_efficient_wq, | |
5009 | &hub->leds, 0); | |
1da177e4 LT |
5010 | } |
5011 | status = -ENOTCONN; /* Don't retry */ | |
5012 | goto loop_disable; | |
5013 | } | |
5014 | } | |
469271f8 | 5015 | |
1da177e4 LT |
5016 | /* check for devices running slower than they could */ |
5017 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
5018 | && udev->speed == USB_SPEED_FULL | |
5019 | && highspeed_hubs != 0) | |
039b3307 | 5020 | check_highspeed(hub, udev, port1); |
1da177e4 | 5021 | |
fa286188 | 5022 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
5023 | * udev becomes globally accessible, although presumably |
5024 | * no one will look at it until hdev is unlocked. | |
5025 | */ | |
1da177e4 LT |
5026 | status = 0; |
5027 | ||
d8521afe DW |
5028 | mutex_lock(&usb_port_peer_mutex); |
5029 | ||
1da177e4 LT |
5030 | /* We mustn't add new devices if the parent hub has |
5031 | * been disconnected; we would race with the | |
5032 | * recursively_mark_NOTATTACHED() routine. | |
5033 | */ | |
5034 | spin_lock_irq(&device_state_lock); | |
5035 | if (hdev->state == USB_STATE_NOTATTACHED) | |
5036 | status = -ENOTCONN; | |
5037 | else | |
d99f6b41 | 5038 | port_dev->child = udev; |
1da177e4 | 5039 | spin_unlock_irq(&device_state_lock); |
d8521afe | 5040 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
5041 | |
5042 | /* Run it through the hoops (find a driver, etc) */ | |
5043 | if (!status) { | |
5044 | status = usb_new_device(udev); | |
5045 | if (status) { | |
d8521afe | 5046 | mutex_lock(&usb_port_peer_mutex); |
1da177e4 | 5047 | spin_lock_irq(&device_state_lock); |
d99f6b41 | 5048 | port_dev->child = NULL; |
1da177e4 | 5049 | spin_unlock_irq(&device_state_lock); |
d8521afe | 5050 | mutex_unlock(&usb_port_peer_mutex); |
01ed67dc TZ |
5051 | } else { |
5052 | if (hcd->usb_phy && !hdev->parent) | |
5053 | usb_phy_notify_connect(hcd->usb_phy, | |
5054 | udev->speed); | |
1da177e4 LT |
5055 | } |
5056 | } | |
5057 | ||
1da177e4 LT |
5058 | if (status) |
5059 | goto loop_disable; | |
5060 | ||
5061 | status = hub_power_remaining(hub); | |
5062 | if (status) | |
d99f6b41 | 5063 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
1da177e4 LT |
5064 | |
5065 | return; | |
5066 | ||
5067 | loop_disable: | |
5068 | hub_port_disable(hub, port1, 1); | |
5069 | loop: | |
fc721f51 | 5070 | usb_ep0_reinit(udev); |
3b29b68b | 5071 | release_devnum(udev); |
f7410ced | 5072 | hub_free_dev(udev); |
1da177e4 | 5073 | usb_put_dev(udev); |
ffcdc18d | 5074 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 | 5075 | break; |
973593a9 ML |
5076 | |
5077 | /* When halfway through our retry count, power-cycle the port */ | |
5078 | if (i == (SET_CONFIG_TRIES / 2) - 1) { | |
5079 | dev_info(&port_dev->dev, "attempt power cycle\n"); | |
5080 | usb_hub_set_port_power(hdev, hub, port1, false); | |
5081 | msleep(2 * hub_power_on_good_delay(hub)); | |
5082 | usb_hub_set_port_power(hdev, hub, port1, true); | |
5083 | msleep(hub_power_on_good_delay(hub)); | |
5084 | } | |
1da177e4 | 5085 | } |
3a31155c AS |
5086 | if (hub->hdev->parent || |
5087 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
5088 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
5089 | if (status != -ENOTCONN && status != -ENODEV) | |
d99f6b41 DW |
5090 | dev_err(&port_dev->dev, |
5091 | "unable to enumerate USB device\n"); | |
e9e88fb7 | 5092 | } |
469271f8 | 5093 | |
1da177e4 LT |
5094 | done: |
5095 | hub_port_disable(hub, port1, 1); | |
94c43b98 AS |
5096 | if (hcd->driver->relinquish_port && !hub->hdev->parent) { |
5097 | if (status != -ENOTCONN && status != -ENODEV) | |
5098 | hcd->driver->relinquish_port(hcd, port1); | |
5099 | } | |
1da177e4 LT |
5100 | } |
5101 | ||
af376a46 DW |
5102 | /* Handle physical or logical connection change events. |
5103 | * This routine is called when: | |
5104 | * a port connection-change occurs; | |
5105 | * a port enable-change occurs (often caused by EMI); | |
5106 | * usb_reset_and_verify_device() encounters changed descriptors (as from | |
5107 | * a firmware download) | |
5108 | * caller already locked the hub | |
5109 | */ | |
5110 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
5111 | u16 portstatus, u16 portchange) | |
5c79a1e3 | 5112 | __must_hold(&port_dev->status_lock) |
714b07be | 5113 | { |
af376a46 DW |
5114 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
5115 | struct usb_device *udev = port_dev->child; | |
5116 | int status = -ENODEV; | |
714b07be | 5117 | |
af376a46 DW |
5118 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
5119 | portchange, portspeed(hub, portstatus)); | |
5120 | ||
5121 | if (hub->has_indicators) { | |
5122 | set_port_led(hub, port1, HUB_LED_AUTO); | |
5123 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4ee823b8 SS |
5124 | } |
5125 | ||
af376a46 DW |
5126 | #ifdef CONFIG_USB_OTG |
5127 | /* during HNP, don't repeat the debounce */ | |
5128 | if (hub->hdev->bus->is_b_host) | |
5129 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | | |
5130 | USB_PORT_STAT_C_ENABLE); | |
5131 | #endif | |
5132 | ||
5133 | /* Try to resuscitate an existing device */ | |
5134 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
5135 | udev->state != USB_STATE_NOTATTACHED) { | |
5136 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
5137 | status = 0; /* Nothing to do */ | |
ceb6c9c8 | 5138 | #ifdef CONFIG_PM |
af376a46 DW |
5139 | } else if (udev->state == USB_STATE_SUSPENDED && |
5140 | udev->persist_enabled) { | |
5141 | /* For a suspended device, treat this as a | |
5142 | * remote wakeup event. | |
5143 | */ | |
5c79a1e3 | 5144 | usb_unlock_port(port_dev); |
af376a46 | 5145 | status = usb_remote_wakeup(udev); |
5c79a1e3 | 5146 | usb_lock_port(port_dev); |
af376a46 DW |
5147 | #endif |
5148 | } else { | |
5149 | /* Don't resuscitate */; | |
5150 | } | |
af376a46 DW |
5151 | } |
5152 | clear_bit(port1, hub->change_bits); | |
5153 | ||
5c79a1e3 | 5154 | /* successfully revalidated the connection */ |
af376a46 DW |
5155 | if (status == 0) |
5156 | return; | |
5157 | ||
5c79a1e3 | 5158 | usb_unlock_port(port_dev); |
af376a46 | 5159 | hub_port_connect(hub, port1, portstatus, portchange); |
5c79a1e3 | 5160 | usb_lock_port(port_dev); |
1da177e4 LT |
5161 | } |
5162 | ||
201af55d JF |
5163 | /* Handle notifying userspace about hub over-current events */ |
5164 | static void port_over_current_notify(struct usb_port *port_dev) | |
5165 | { | |
5166 | static char *envp[] = { NULL, NULL, NULL }; | |
5167 | struct device *hub_dev; | |
5168 | char *port_dev_path; | |
5169 | ||
5170 | sysfs_notify(&port_dev->dev.kobj, NULL, "over_current_count"); | |
5171 | ||
5172 | hub_dev = port_dev->dev.parent; | |
5173 | ||
5174 | if (!hub_dev) | |
5175 | return; | |
5176 | ||
5177 | port_dev_path = kobject_get_path(&port_dev->dev.kobj, GFP_KERNEL); | |
5178 | if (!port_dev_path) | |
5179 | return; | |
5180 | ||
5181 | envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path); | |
5182 | if (!envp[0]) | |
bf7f547e | 5183 | goto exit_path; |
201af55d JF |
5184 | |
5185 | envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u", | |
5186 | port_dev->over_current_count); | |
5187 | if (!envp[1]) | |
5188 | goto exit; | |
5189 | ||
5190 | kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp); | |
5191 | ||
5192 | kfree(envp[1]); | |
5193 | exit: | |
5194 | kfree(envp[0]); | |
bf7f547e CIK |
5195 | exit_path: |
5196 | kfree(port_dev_path); | |
201af55d JF |
5197 | } |
5198 | ||
af376a46 | 5199 | static void port_event(struct usb_hub *hub, int port1) |
5c79a1e3 | 5200 | __must_hold(&port_dev->status_lock) |
af376a46 | 5201 | { |
7671bd1e | 5202 | int connect_change; |
af376a46 DW |
5203 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
5204 | struct usb_device *udev = port_dev->child; | |
5205 | struct usb_device *hdev = hub->hdev; | |
5206 | u16 portstatus, portchange; | |
5207 | ||
5208 | connect_change = test_bit(port1, hub->change_bits); | |
5209 | clear_bit(port1, hub->event_bits); | |
5210 | clear_bit(port1, hub->wakeup_bits); | |
5211 | ||
5212 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) | |
5213 | return; | |
5214 | ||
5215 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
5216 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); | |
5217 | connect_change = 1; | |
5218 | } | |
5219 | ||
5220 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
5221 | if (!connect_change) | |
5222 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", | |
5223 | portstatus); | |
5224 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
5225 | ||
5226 | /* | |
5227 | * EM interference sometimes causes badly shielded USB devices | |
5228 | * to be shutdown by the hub, this hack enables them again. | |
5229 | * Works at least with mouse driver. | |
5230 | */ | |
5231 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
5232 | && !connect_change && udev) { | |
5233 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); | |
5234 | connect_change = 1; | |
5235 | } | |
5236 | } | |
5237 | ||
5238 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
5239 | u16 status = 0, unused; | |
1cbd53c8 | 5240 | port_dev->over_current_count++; |
201af55d | 5241 | port_over_current_notify(port_dev); |
af376a46 | 5242 | |
1cbd53c8 RL |
5243 | dev_dbg(&port_dev->dev, "over-current change #%u\n", |
5244 | port_dev->over_current_count); | |
af376a46 DW |
5245 | usb_clear_port_feature(hdev, port1, |
5246 | USB_PORT_FEAT_C_OVER_CURRENT); | |
5247 | msleep(100); /* Cool down */ | |
5248 | hub_power_on(hub, true); | |
5249 | hub_port_status(hub, port1, &status, &unused); | |
5250 | if (status & USB_PORT_STAT_OVERCURRENT) | |
5251 | dev_err(&port_dev->dev, "over-current condition\n"); | |
5252 | } | |
5253 | ||
5254 | if (portchange & USB_PORT_STAT_C_RESET) { | |
5255 | dev_dbg(&port_dev->dev, "reset change\n"); | |
5256 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); | |
5257 | } | |
5258 | if ((portchange & USB_PORT_STAT_C_BH_RESET) | |
5259 | && hub_is_superspeed(hdev)) { | |
5260 | dev_dbg(&port_dev->dev, "warm reset change\n"); | |
5261 | usb_clear_port_feature(hdev, port1, | |
5262 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
5263 | } | |
5264 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { | |
5265 | dev_dbg(&port_dev->dev, "link state change\n"); | |
5266 | usb_clear_port_feature(hdev, port1, | |
5267 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
5268 | } | |
5269 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
5270 | dev_warn(&port_dev->dev, "config error\n"); | |
5271 | usb_clear_port_feature(hdev, port1, | |
5272 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
5273 | } | |
5274 | ||
097a155f DW |
5275 | /* skip port actions that require the port to be powered on */ |
5276 | if (!pm_runtime_active(&port_dev->dev)) | |
5277 | return; | |
714b07be | 5278 | |
af376a46 DW |
5279 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
5280 | connect_change = 1; | |
5281 | ||
5282 | /* | |
5283 | * Warm reset a USB3 protocol port if it's in | |
5284 | * SS.Inactive state. | |
5285 | */ | |
3cd12f91 | 5286 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
af376a46 DW |
5287 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
5288 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) | |
5289 | || udev->state == USB_STATE_NOTATTACHED) { | |
5290 | if (hub_port_reset(hub, port1, NULL, | |
5291 | HUB_BH_RESET_TIME, true) < 0) | |
5292 | hub_port_disable(hub, port1, 1); | |
7671bd1e ZJC |
5293 | } else { |
5294 | usb_unlock_port(port_dev); | |
5295 | usb_lock_device(udev); | |
5296 | usb_reset_device(udev); | |
5297 | usb_unlock_device(udev); | |
5298 | usb_lock_port(port_dev); | |
5299 | connect_change = 0; | |
5300 | } | |
714b07be | 5301 | } |
af376a46 DW |
5302 | |
5303 | if (connect_change) | |
5304 | hub_port_connect_change(hub, port1, portstatus, portchange); | |
714b07be SS |
5305 | } |
5306 | ||
32a69589 | 5307 | static void hub_event(struct work_struct *work) |
1da177e4 | 5308 | { |
1da177e4 LT |
5309 | struct usb_device *hdev; |
5310 | struct usb_interface *intf; | |
5311 | struct usb_hub *hub; | |
5312 | struct device *hub_dev; | |
5313 | u16 hubstatus; | |
5314 | u16 hubchange; | |
1da177e4 | 5315 | int i, ret; |
1da177e4 | 5316 | |
32a69589 | 5317 | hub = container_of(work, struct usb_hub, events); |
eb6e2924 PM |
5318 | hdev = hub->hdev; |
5319 | hub_dev = hub->intfdev; | |
5320 | intf = to_usb_interface(hub_dev); | |
32a69589 | 5321 | |
eb6e2924 PM |
5322 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
5323 | hdev->state, hdev->maxchild, | |
5324 | /* NOTE: expects max 15 ports... */ | |
5325 | (u16) hub->change_bits[0], | |
5326 | (u16) hub->event_bits[0]); | |
5327 | ||
5328 | /* Lock the device, then check to see if we were | |
5329 | * disconnected while waiting for the lock to succeed. */ | |
5330 | usb_lock_device(hdev); | |
5331 | if (unlikely(hub->disconnected)) | |
32a69589 | 5332 | goto out_hdev_lock; |
eb6e2924 PM |
5333 | |
5334 | /* If the hub has died, clean up after it */ | |
5335 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
5336 | hub->error = -ENODEV; | |
5337 | hub_quiesce(hub, HUB_DISCONNECT); | |
32a69589 | 5338 | goto out_hdev_lock; |
eb6e2924 PM |
5339 | } |
5340 | ||
5341 | /* Autoresume */ | |
5342 | ret = usb_autopm_get_interface(intf); | |
5343 | if (ret) { | |
5344 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
32a69589 | 5345 | goto out_hdev_lock; |
eb6e2924 | 5346 | } |
1da177e4 | 5347 | |
eb6e2924 PM |
5348 | /* If this is an inactive hub, do nothing */ |
5349 | if (hub->quiescing) | |
5350 | goto out_autopm; | |
1da177e4 | 5351 | |
eb6e2924 PM |
5352 | if (hub->error) { |
5353 | dev_dbg(hub_dev, "resetting for error %d\n", hub->error); | |
5354 | ||
5355 | ret = usb_reset_device(hdev); | |
40f122f3 | 5356 | if (ret) { |
eb6e2924 PM |
5357 | dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
5358 | goto out_autopm; | |
40f122f3 | 5359 | } |
a8e7c565 | 5360 | |
eb6e2924 PM |
5361 | hub->nerrors = 0; |
5362 | hub->error = 0; | |
5363 | } | |
1da177e4 | 5364 | |
eb6e2924 PM |
5365 | /* deal with port status changes */ |
5366 | for (i = 1; i <= hdev->maxchild; i++) { | |
5367 | struct usb_port *port_dev = hub->ports[i - 1]; | |
1da177e4 | 5368 | |
eb6e2924 PM |
5369 | if (test_bit(i, hub->event_bits) |
5370 | || test_bit(i, hub->change_bits) | |
5371 | || test_bit(i, hub->wakeup_bits)) { | |
5372 | /* | |
5373 | * The get_noresume and barrier ensure that if | |
5374 | * the port was in the process of resuming, we | |
5375 | * flush that work and keep the port active for | |
5376 | * the duration of the port_event(). However, | |
5377 | * if the port is runtime pm suspended | |
5378 | * (powered-off), we leave it in that state, run | |
5379 | * an abbreviated port_event(), and move on. | |
5380 | */ | |
5381 | pm_runtime_get_noresume(&port_dev->dev); | |
5382 | pm_runtime_barrier(&port_dev->dev); | |
5383 | usb_lock_port(port_dev); | |
5384 | port_event(hub, i); | |
5385 | usb_unlock_port(port_dev); | |
5386 | pm_runtime_put_sync(&port_dev->dev); | |
1da177e4 | 5387 | } |
eb6e2924 | 5388 | } |
1da177e4 | 5389 | |
eb6e2924 PM |
5390 | /* deal with hub status changes */ |
5391 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
5392 | ; /* do nothing */ | |
5393 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
5394 | dev_err(hub_dev, "get_hub_status failed\n"); | |
5395 | else { | |
5396 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
5397 | dev_dbg(hub_dev, "power change\n"); | |
5398 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
5399 | if (hubstatus & HUB_STATUS_LOCAL_POWER) | |
5400 | /* FIXME: Is this always true? */ | |
5401 | hub->limited_power = 1; | |
5402 | else | |
5403 | hub->limited_power = 0; | |
af376a46 | 5404 | } |
eb6e2924 PM |
5405 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
5406 | u16 status = 0; | |
5407 | u16 unused; | |
1da177e4 | 5408 | |
eb6e2924 PM |
5409 | dev_dbg(hub_dev, "over-current change\n"); |
5410 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
5411 | msleep(500); /* Cool down */ | |
5412 | hub_power_on(hub, true); | |
5413 | hub_hub_status(hub, &status, &unused); | |
5414 | if (status & HUB_STATUS_OVERCURRENT) | |
5415 | dev_err(hub_dev, "over-current condition\n"); | |
1da177e4 | 5416 | } |
eb6e2924 | 5417 | } |
1da177e4 | 5418 | |
eb6e2924 PM |
5419 | out_autopm: |
5420 | /* Balance the usb_autopm_get_interface() above */ | |
5421 | usb_autopm_put_interface_no_suspend(intf); | |
32a69589 | 5422 | out_hdev_lock: |
eb6e2924 | 5423 | usb_unlock_device(hdev); |
1da177e4 | 5424 | |
32a69589 PM |
5425 | /* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
5426 | usb_autopm_put_interface(intf); | |
5427 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
5428 | } |
5429 | ||
1e927d96 | 5430 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 5431 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 5432 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
5433 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
5434 | .bInterfaceClass = USB_CLASS_HUB, | |
5435 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
5436 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
5437 | .bDeviceClass = USB_CLASS_HUB}, | |
5438 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
5439 | .bInterfaceClass = USB_CLASS_HUB}, | |
5440 | { } /* Terminating entry */ | |
5441 | }; | |
5442 | ||
039b3307 | 5443 | MODULE_DEVICE_TABLE(usb, hub_id_table); |
1da177e4 LT |
5444 | |
5445 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
5446 | .name = "hub", |
5447 | .probe = hub_probe, | |
5448 | .disconnect = hub_disconnect, | |
5449 | .suspend = hub_suspend, | |
5450 | .resume = hub_resume, | |
f07600cf | 5451 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
5452 | .pre_reset = hub_pre_reset, |
5453 | .post_reset = hub_post_reset, | |
c532b29a | 5454 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 5455 | .id_table = hub_id_table, |
40f122f3 | 5456 | .supports_autosuspend = 1, |
1da177e4 LT |
5457 | }; |
5458 | ||
5459 | int usb_hub_init(void) | |
5460 | { | |
1da177e4 LT |
5461 | if (usb_register(&hub_driver) < 0) { |
5462 | printk(KERN_ERR "%s: can't register hub driver\n", | |
5463 | usbcore_name); | |
5464 | return -1; | |
5465 | } | |
5466 | ||
32a69589 PM |
5467 | /* |
5468 | * The workqueue needs to be freezable to avoid interfering with | |
5469 | * USB-PERSIST port handover. Otherwise it might see that a full-speed | |
5470 | * device was gone before the EHCI controller had handed its port | |
5471 | * over to the companion full-speed controller. | |
32a69589 | 5472 | */ |
638139eb | 5473 | hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); |
32a69589 | 5474 | if (hub_wq) |
1da177e4 | 5475 | return 0; |
1da177e4 LT |
5476 | |
5477 | /* Fall through if kernel_thread failed */ | |
5478 | usb_deregister(&hub_driver); | |
32a69589 | 5479 | pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
1da177e4 LT |
5480 | |
5481 | return -1; | |
5482 | } | |
5483 | ||
5484 | void usb_hub_cleanup(void) | |
5485 | { | |
32a69589 | 5486 | destroy_workqueue(hub_wq); |
1da177e4 LT |
5487 | |
5488 | /* | |
5489 | * Hub resources are freed for us by usb_deregister. It calls | |
5490 | * usb_driver_purge on every device which in turn calls that | |
5491 | * devices disconnect function if it is using this driver. | |
5492 | * The hub_disconnect function takes care of releasing the | |
5493 | * individual hub resources. -greg | |
5494 | */ | |
5495 | usb_deregister(&hub_driver); | |
5496 | } /* usb_hub_cleanup() */ | |
5497 | ||
eb764c4b | 5498 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5499 | struct usb_device_descriptor *old_device_descriptor, |
5500 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5501 | { |
5502 | int changed = 0; | |
5503 | unsigned index; | |
5504 | unsigned serial_len = 0; | |
5505 | unsigned len; | |
5506 | unsigned old_length; | |
5507 | int length; | |
5508 | char *buf; | |
5509 | ||
5510 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5511 | sizeof(*old_device_descriptor)) != 0) | |
5512 | return 1; | |
5513 | ||
e3376d6c XR |
5514 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5515 | return 1; | |
5516 | if (udev->bos) { | |
b9a10481 XR |
5517 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5518 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5519 | return 1; |
b9a10481 | 5520 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5521 | return 1; |
5522 | } | |
5523 | ||
eb764c4b AS |
5524 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5525 | * device descriptor haven't changed, we will assume the | |
5526 | * Manufacturer and Product strings haven't changed either. | |
5527 | * But the SerialNumber string could be different (e.g., a | |
5528 | * different flash card of the same brand). | |
5529 | */ | |
5530 | if (udev->serial) | |
5531 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5532 | |
eb764c4b | 5533 | len = serial_len; |
1da177e4 | 5534 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5535 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5536 | len = max(len, old_length); | |
1da177e4 | 5537 | } |
eb764c4b | 5538 | |
0cc1a51f | 5539 | buf = kmalloc(len, GFP_NOIO); |
b74e7062 | 5540 | if (!buf) |
1da177e4 LT |
5541 | /* assume the worst */ |
5542 | return 1; | |
b74e7062 | 5543 | |
1da177e4 | 5544 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b | 5545 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5546 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5547 | old_length); | |
eb764c4b | 5548 | if (length != old_length) { |
1da177e4 LT |
5549 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5550 | index, length); | |
eb764c4b | 5551 | changed = 1; |
1da177e4 LT |
5552 | break; |
5553 | } | |
039b3307 | 5554 | if (memcmp(buf, udev->rawdescriptors[index], old_length) |
1da177e4 LT |
5555 | != 0) { |
5556 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5557 | index, |
5558 | ((struct usb_config_descriptor *) buf)-> | |
5559 | bConfigurationValue); | |
5560 | changed = 1; | |
1da177e4 LT |
5561 | break; |
5562 | } | |
5563 | } | |
eb764c4b AS |
5564 | |
5565 | if (!changed && serial_len) { | |
5566 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5567 | buf, serial_len); | |
5568 | if (length + 1 != serial_len) { | |
5569 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5570 | length); | |
5571 | changed = 1; | |
5572 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5573 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5574 | changed = 1; | |
5575 | } | |
5576 | } | |
5577 | ||
1da177e4 | 5578 | kfree(buf); |
eb764c4b | 5579 | return changed; |
1da177e4 LT |
5580 | } |
5581 | ||
5582 | /** | |
742120c6 | 5583 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5584 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5585 | * | |
79efa097 AS |
5586 | * WARNING - don't use this routine to reset a composite device |
5587 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5588 | * Use usb_reset_device() instead. |
1da177e4 LT |
5589 | * |
5590 | * Do a port reset, reassign the device's address, and establish its | |
5591 | * former operating configuration. If the reset fails, or the device's | |
5592 | * descriptors change from their values before the reset, or the original | |
5593 | * configuration and altsettings cannot be restored, a flag will be set | |
37ebb549 | 5594 | * telling hub_wq to pretend the device has been disconnected and then |
1da177e4 LT |
5595 | * re-connected. All drivers will be unbound, and the device will be |
5596 | * re-enumerated and probed all over again. | |
5597 | * | |
626f090c | 5598 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5599 | * flagged for logical disconnection, or some other negative error code |
5600 | * if the reset wasn't even attempted. | |
5601 | * | |
626f090c | 5602 | * Note: |
5c79a1e3 DW |
5603 | * The caller must own the device lock and the port lock, the latter is |
5604 | * taken by usb_reset_device(). For example, it's safe to use | |
5605 | * usb_reset_device() from a driver probe() routine after downloading | |
5606 | * new firmware. For calls that might not occur during probe(), drivers | |
5607 | * should lock the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5608 | * |
5609 | * Locking exception: This routine may also be called from within an | |
5610 | * autoresume handler. Such usage won't conflict with other tasks | |
5611 | * holding the device lock because these tasks should always call | |
5c79a1e3 DW |
5612 | * usb_autopm_resume_device(), thereby preventing any unwanted |
5613 | * autoresume. The autoresume handler is expected to have already | |
5614 | * acquired the port lock before calling this routine. | |
1da177e4 | 5615 | */ |
742120c6 | 5616 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5617 | { |
5618 | struct usb_device *parent_hdev = udev->parent; | |
5619 | struct usb_hub *parent_hub; | |
3f0479e0 | 5620 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5621 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5622 | struct usb_host_bos *bos; |
7a7b562d | 5623 | int i, j, ret = 0; |
12c3da34 | 5624 | int port1 = udev->portnum; |
1da177e4 LT |
5625 | |
5626 | if (udev->state == USB_STATE_NOTATTACHED || | |
5627 | udev->state == USB_STATE_SUSPENDED) { | |
5628 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5629 | udev->state); | |
5630 | return -EINVAL; | |
5631 | } | |
5632 | ||
5c79a1e3 | 5633 | if (!parent_hdev) |
1da177e4 | 5634 | return -EISDIR; |
5c79a1e3 | 5635 | |
ad493e5e | 5636 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5637 | |
dcc01c08 SS |
5638 | /* Disable USB2 hardware LPM. |
5639 | * It will be re-enabled by the enumeration process. | |
5640 | */ | |
5641 | if (udev->usb2_hw_lpm_enabled == 1) | |
5642 | usb_set_usb2_hardware_lpm(udev, 0); | |
5643 | ||
57edd462 MN |
5644 | /* Disable LPM while we reset the device and reinstall the alt settings. |
5645 | * Device-initiated LPM, and system exit latency settings are cleared | |
5646 | * when the device is reset, so we have to set them up again. | |
6d1d0513 SS |
5647 | */ |
5648 | ret = usb_unlocked_disable_lpm(udev); | |
5649 | if (ret) { | |
1ccc417e | 5650 | dev_err(&udev->dev, "%s Failed to disable LPM\n", __func__); |
464ad8c4 | 5651 | goto re_enumerate_no_bos; |
6d1d0513 SS |
5652 | } |
5653 | ||
464ad8c4 | 5654 | bos = udev->bos; |
e5bdfd50 | 5655 | udev->bos = NULL; |
464ad8c4 | 5656 | |
1da177e4 LT |
5657 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
5658 | ||
5659 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5660 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5661 | usb_ep0_reinit(udev); |
1da177e4 | 5662 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5663 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5664 | break; |
5665 | } | |
d5cbad4b | 5666 | |
1da177e4 LT |
5667 | if (ret < 0) |
5668 | goto re_enumerate; | |
469271f8 | 5669 | |
1da177e4 | 5670 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5671 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5672 | dev_info(&udev->dev, "device firmware changed\n"); |
5673 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5674 | goto re_enumerate; | |
469271f8 | 5675 | } |
4fe0387a AS |
5676 | |
5677 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5678 | if (!udev->actconfig) |
5679 | goto done; | |
3f0479e0 | 5680 | |
d673bfcb | 5681 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5682 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5683 | if (ret < 0) { | |
5684 | dev_warn(&udev->dev, | |
5685 | "Busted HC? Not enough HCD resources for " | |
5686 | "old configuration.\n"); | |
d673bfcb | 5687 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5688 | goto re_enumerate; |
5689 | } | |
1da177e4 LT |
5690 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5691 | USB_REQ_SET_CONFIGURATION, 0, | |
5692 | udev->actconfig->desc.bConfigurationValue, 0, | |
5693 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5694 | if (ret < 0) { | |
5695 | dev_err(&udev->dev, | |
5696 | "can't restore configuration #%d (error=%d)\n", | |
5697 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5698 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5699 | goto re_enumerate; |
469271f8 | 5700 | } |
d673bfcb | 5701 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5702 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5703 | ||
4fe0387a AS |
5704 | /* Put interfaces back into the same altsettings as before. |
5705 | * Don't bother to send the Set-Interface request for interfaces | |
5706 | * that were already in altsetting 0; besides being unnecessary, | |
5707 | * many devices can't handle it. Instead just reset the host-side | |
5708 | * endpoint state. | |
5709 | */ | |
1da177e4 | 5710 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5711 | struct usb_host_config *config = udev->actconfig; |
5712 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5713 | struct usb_interface_descriptor *desc; |
5714 | ||
1da177e4 | 5715 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5716 | if (desc->bAlternateSetting == 0) { |
5717 | usb_disable_interface(udev, intf, true); | |
5718 | usb_enable_interface(udev, intf, true); | |
5719 | ret = 0; | |
5720 | } else { | |
04a723ea SS |
5721 | /* Let the bandwidth allocation function know that this |
5722 | * device has been reset, and it will have to use | |
5723 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5724 | */ |
04a723ea | 5725 | intf->resetting_device = 1; |
4fe0387a AS |
5726 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5727 | desc->bAlternateSetting); | |
04a723ea | 5728 | intf->resetting_device = 0; |
4fe0387a | 5729 | } |
1da177e4 LT |
5730 | if (ret < 0) { |
5731 | dev_err(&udev->dev, "failed to restore interface %d " | |
5732 | "altsetting %d (error=%d)\n", | |
5733 | desc->bInterfaceNumber, | |
5734 | desc->bAlternateSetting, | |
5735 | ret); | |
5736 | goto re_enumerate; | |
5737 | } | |
7a7b562d HG |
5738 | /* Resetting also frees any allocated streams */ |
5739 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) | |
5740 | intf->cur_altsetting->endpoint[j].streams = 0; | |
1da177e4 LT |
5741 | } |
5742 | ||
5743 | done: | |
f74631e3 | 5744 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5745 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5746 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5747 | usb_enable_ltm(udev); |
e5bdfd50 GKH |
5748 | usb_release_bos_descriptor(udev); |
5749 | udev->bos = bos; | |
1da177e4 | 5750 | return 0; |
469271f8 | 5751 | |
1da177e4 | 5752 | re_enumerate: |
e3376d6c XR |
5753 | usb_release_bos_descriptor(udev); |
5754 | udev->bos = bos; | |
464ad8c4 HY |
5755 | re_enumerate_no_bos: |
5756 | /* LPM state doesn't matter when we're about to destroy the device. */ | |
5757 | hub_port_logical_disconnect(parent_hub, port1); | |
1da177e4 LT |
5758 | return -ENODEV; |
5759 | } | |
79efa097 AS |
5760 | |
5761 | /** | |
742120c6 | 5762 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5763 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5764 | * |
5765 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5766 | * method), performs the port reset, and then lets the drivers know that | |
5767 | * the reset is over (using their post_reset method). | |
5768 | * | |
626f090c | 5769 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5770 | * |
626f090c | 5771 | * Note: |
79efa097 AS |
5772 | * The caller must own the device lock. For example, it's safe to use |
5773 | * this from a driver probe() routine after downloading new firmware. | |
5774 | * For calls that might not occur during probe(), drivers should lock | |
5775 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5776 | * |
5777 | * If an interface is currently being probed or disconnected, we assume | |
5778 | * its driver knows how to handle resets. For all other interfaces, | |
5779 | * if the driver doesn't have pre_reset and post_reset methods then | |
5780 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5781 | */ |
742120c6 | 5782 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5783 | { |
5784 | int ret; | |
852c4b43 | 5785 | int i; |
4d769def | 5786 | unsigned int noio_flag; |
5c79a1e3 | 5787 | struct usb_port *port_dev; |
79efa097 | 5788 | struct usb_host_config *config = udev->actconfig; |
5c79a1e3 | 5789 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
79efa097 AS |
5790 | |
5791 | if (udev->state == USB_STATE_NOTATTACHED || | |
5792 | udev->state == USB_STATE_SUSPENDED) { | |
5793 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5794 | udev->state); | |
5795 | return -EINVAL; | |
5796 | } | |
5797 | ||
5c79a1e3 DW |
5798 | if (!udev->parent) { |
5799 | /* this requires hcd-specific logic; see ohci_restart() */ | |
5800 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); | |
5801 | return -EISDIR; | |
5802 | } | |
5803 | ||
5804 | port_dev = hub->ports[udev->portnum - 1]; | |
5805 | ||
4d769def ML |
5806 | /* |
5807 | * Don't allocate memory with GFP_KERNEL in current | |
5808 | * context to avoid possible deadlock if usb mass | |
5809 | * storage interface or usbnet interface(iSCSI case) | |
5810 | * is included in current configuration. The easist | |
5811 | * approach is to do it for every device reset, | |
5812 | * because the device 'memalloc_noio' flag may have | |
5813 | * not been set before reseting the usb device. | |
5814 | */ | |
5815 | noio_flag = memalloc_noio_save(); | |
5816 | ||
645daaab | 5817 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5818 | usb_autoresume_device(udev); |
645daaab | 5819 | |
79efa097 | 5820 | if (config) { |
79efa097 | 5821 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5822 | struct usb_interface *cintf = config->interface[i]; |
5823 | struct usb_driver *drv; | |
78d9a487 | 5824 | int unbind = 0; |
852c4b43 AS |
5825 | |
5826 | if (cintf->dev.driver) { | |
79efa097 | 5827 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5828 | if (drv->pre_reset && drv->post_reset) |
5829 | unbind = (drv->pre_reset)(cintf); | |
5830 | else if (cintf->condition == | |
5831 | USB_INTERFACE_BOUND) | |
5832 | unbind = 1; | |
5833 | if (unbind) | |
5834 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5835 | } |
5836 | } | |
5837 | } | |
5838 | ||
5c79a1e3 | 5839 | usb_lock_port(port_dev); |
742120c6 | 5840 | ret = usb_reset_and_verify_device(udev); |
5c79a1e3 | 5841 | usb_unlock_port(port_dev); |
79efa097 AS |
5842 | |
5843 | if (config) { | |
79efa097 | 5844 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5845 | struct usb_interface *cintf = config->interface[i]; |
5846 | struct usb_driver *drv; | |
78d9a487 | 5847 | int rebind = cintf->needs_binding; |
852c4b43 | 5848 | |
78d9a487 | 5849 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5850 | drv = to_usb_driver(cintf->dev.driver); |
5851 | if (drv->post_reset) | |
78d9a487 AS |
5852 | rebind = (drv->post_reset)(cintf); |
5853 | else if (cintf->condition == | |
5854 | USB_INTERFACE_BOUND) | |
5855 | rebind = 1; | |
6aec044c AS |
5856 | if (rebind) |
5857 | cintf->needs_binding = 1; | |
79efa097 | 5858 | } |
79efa097 | 5859 | } |
6aec044c | 5860 | usb_unbind_and_rebind_marked_interfaces(udev); |
79efa097 AS |
5861 | } |
5862 | ||
94fcda1f | 5863 | usb_autosuspend_device(udev); |
4d769def | 5864 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5865 | return ret; |
5866 | } | |
742120c6 | 5867 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5868 | |
5869 | ||
5870 | /** | |
5871 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5872 | * @iface: USB interface belonging to the device to reset | |
5873 | * | |
5874 | * This function can be used to reset a USB device from an atomic | |
5875 | * context, where usb_reset_device() won't work (as it blocks). | |
5876 | * | |
5877 | * Doing a reset via this method is functionally equivalent to calling | |
5878 | * usb_reset_device(), except for the fact that it is delayed to a | |
5879 | * workqueue. This means that any drivers bound to other interfaces | |
5880 | * might be unbound, as well as users from usbfs in user space. | |
5881 | * | |
5882 | * Corner cases: | |
5883 | * | |
5884 | * - Scheduling two resets at the same time from two different drivers | |
5885 | * attached to two different interfaces of the same device is | |
5886 | * possible; depending on how the driver attached to each interface | |
5887 | * handles ->pre_reset(), the second reset might happen or not. | |
5888 | * | |
524134d4 AS |
5889 | * - If the reset is delayed so long that the interface is unbound from |
5890 | * its driver, the reset will be skipped. | |
dc023dce | 5891 | * |
524134d4 AS |
5892 | * - This function can be called during .probe(). It can also be called |
5893 | * during .disconnect(), but doing so is pointless because the reset | |
5894 | * will not occur. If you really want to reset the device during | |
5895 | * .disconnect(), call usb_reset_device() directly -- but watch out | |
5896 | * for nested unbinding issues! | |
dc023dce IPG |
5897 | */ |
5898 | void usb_queue_reset_device(struct usb_interface *iface) | |
5899 | { | |
524134d4 AS |
5900 | if (schedule_work(&iface->reset_ws)) |
5901 | usb_get_intf(iface); | |
dc023dce IPG |
5902 | } |
5903 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5904 | |
5905 | /** | |
5906 | * usb_hub_find_child - Get the pointer of child device | |
5907 | * attached to the port which is specified by @port1. | |
5908 | * @hdev: USB device belonging to the usb hub | |
5909 | * @port1: port num to indicate which port the child device | |
5910 | * is attached to. | |
5911 | * | |
5912 | * USB drivers call this function to get hub's child device | |
5913 | * pointer. | |
5914 | * | |
626f090c | 5915 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5916 | * child's usb_device pointer if non-NULL. |
5917 | */ | |
5918 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5919 | int port1) | |
5920 | { | |
ad493e5e | 5921 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5922 | |
5923 | if (port1 < 1 || port1 > hdev->maxchild) | |
5924 | return NULL; | |
5925 | return hub->ports[port1 - 1]->child; | |
5926 | } | |
5927 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5928 | |
d2123fd9 LT |
5929 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5930 | struct usb_hub_descriptor *desc) | |
5931 | { | |
d99f6b41 | 5932 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d2123fd9 LT |
5933 | enum usb_port_connect_type connect_type; |
5934 | int i; | |
5935 | ||
d99f6b41 DW |
5936 | if (!hub) |
5937 | return; | |
5938 | ||
d2123fd9 LT |
5939 | if (!hub_is_superspeed(hdev)) { |
5940 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5941 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5942 | |
d99f6b41 | 5943 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5944 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5945 | u8 mask = 1 << (i%8); | |
5946 | ||
5947 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
d99f6b41 | 5948 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5949 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
5950 | } | |
5951 | } | |
5952 | } | |
5953 | } else { | |
5954 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5955 | ||
5956 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5957 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5958 | |
d99f6b41 | 5959 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5960 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5961 | u16 mask = 1 << i; | |
5962 | ||
5963 | if (!(port_removable & mask)) { | |
d99f6b41 | 5964 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5965 | port_removable |= mask; |
5966 | } | |
5967 | } | |
5968 | } | |
5969 | ||
5970 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5971 | } | |
5972 | } | |
5973 | ||
d5575424 LT |
5974 | #ifdef CONFIG_ACPI |
5975 | /** | |
5976 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5977 | * @hdev: USB device belonging to the usb hub | |
5978 | * @port1: port num of the port | |
5979 | * | |
626f090c YB |
5980 | * Return: Port's acpi handle if successful, %NULL if params are |
5981 | * invalid. | |
d5575424 LT |
5982 | */ |
5983 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5984 | int port1) | |
5985 | { | |
ad493e5e | 5986 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5987 | |
41341261 MN |
5988 | if (!hub) |
5989 | return NULL; | |
5990 | ||
3a83f992 | 5991 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5992 | } |
5993 | #endif |