Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
27729aad | 22 | #include <linux/usb/hcd.h> |
925aa46b | 23 | #include <linux/usb/otg.h> |
93362a87 | 24 | #include <linux/usb/quirks.h> |
32a69589 | 25 | #include <linux/workqueue.h> |
4186ecf8 | 26 | #include <linux/mutex.h> |
b04b3156 | 27 | #include <linux/random.h> |
ad493e5e | 28 | #include <linux/pm_qos.h> |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/byteorder.h> | |
32 | ||
6e30d7cb | 33 | #include "hub.h" |
026f3fcb | 34 | #include "otg_whitelist.h" |
1da177e4 | 35 | |
e6f30dea ML |
36 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
37 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
38 | ||
fa286188 | 39 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 40 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
41 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
42 | static DEFINE_SPINLOCK(device_state_lock); | |
43 | ||
32a69589 PM |
44 | /* workqueue to process hub events */ |
45 | static struct workqueue_struct *hub_wq; | |
46 | static void hub_event(struct work_struct *work); | |
1da177e4 | 47 | |
d8521afe DW |
48 | /* synchronize hub-port add/remove and peering operations */ |
49 | DEFINE_MUTEX(usb_port_peer_mutex); | |
50 | ||
1da177e4 | 51 | /* cycle leds on hubs that aren't blinking for attention */ |
90ab5ee9 | 52 | static bool blinkenlights = 0; |
1da177e4 LT |
53 | module_param (blinkenlights, bool, S_IRUGO); |
54 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
55 | ||
fd7c519d JK |
56 | /* |
57 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
58 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
59 | */ | |
60 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
61 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
62 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
63 | MODULE_PARM_DESC(initial_descriptor_timeout, |
64 | "initial 64-byte descriptor request timeout in milliseconds " | |
65 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 66 | |
1da177e4 LT |
67 | /* |
68 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
69 | * closely resembles the way Windows works. Hopefully it will be compatible | |
70 | * with a wider range of devices than the old scheme. However some previously | |
71 | * working devices may start giving rise to "device not accepting address" | |
72 | * errors; if that happens the user can try the old scheme by adjusting the | |
73 | * following module parameters. | |
74 | * | |
75 | * For maximum flexibility there are two boolean parameters to control the | |
76 | * hub driver's behavior. On the first initialization attempt, if the | |
77 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
78 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
79 | * is set, then the driver will make another attempt, using the other scheme. | |
80 | */ | |
90ab5ee9 | 81 | static bool old_scheme_first = 0; |
1da177e4 LT |
82 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
83 | MODULE_PARM_DESC(old_scheme_first, | |
84 | "start with the old device initialization scheme"); | |
85 | ||
90ab5ee9 | 86 | static bool use_both_schemes = 1; |
1da177e4 LT |
87 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
88 | MODULE_PARM_DESC(use_both_schemes, | |
89 | "try the other device initialization scheme if the " | |
90 | "first one fails"); | |
91 | ||
32fe0198 AS |
92 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
93 | * port reset on some companion controllers. | |
94 | */ | |
95 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
96 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
97 | ||
ad493e5e | 98 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
99 | #define HUB_DEBOUNCE_STEP 25 |
100 | #define HUB_DEBOUNCE_STABLE 100 | |
101 | ||
32a69589 | 102 | static void hub_release(struct kref *kref); |
742120c6 ML |
103 | static int usb_reset_and_verify_device(struct usb_device *udev); |
104 | ||
131dec34 | 105 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 106 | { |
131dec34 SS |
107 | if (hub_is_superspeed(hub->hdev)) |
108 | return "5.0 Gb/s"; | |
288ead45 | 109 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 110 | return "480 Mb/s"; |
288ead45 | 111 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
112 | return "1.5 Mb/s"; |
113 | else | |
114 | return "12 Mb/s"; | |
115 | } | |
1da177e4 LT |
116 | |
117 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 118 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 119 | { |
ff823c79 | 120 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 121 | return NULL; |
1da177e4 LT |
122 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
123 | } | |
124 | ||
140e3026 | 125 | static int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c SS |
126 | { |
127 | /* USB 2.1 (and greater) devices indicate LPM support through | |
128 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
129 | */ | |
130 | if (udev->speed == USB_SPEED_HIGH) { | |
131 | if (udev->bos->ext_cap && | |
132 | (USB_LPM_SUPPORT & | |
133 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
134 | return 1; | |
135 | return 0; | |
136 | } | |
51e0a012 | 137 | |
25cd2882 SS |
138 | /* |
139 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. | |
140 | * However, there are some that don't, and they set the U1/U2 exit | |
141 | * latencies to zero. | |
51e0a012 SS |
142 | */ |
143 | if (!udev->bos->ss_cap) { | |
25cd2882 | 144 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
51e0a012 SS |
145 | return 0; |
146 | } | |
51e0a012 | 147 | |
25cd2882 SS |
148 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
149 | udev->bos->ss_cap->bU2DevExitLat == 0) { | |
150 | if (udev->parent) | |
151 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); | |
152 | else | |
153 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); | |
51e0a012 SS |
154 | return 0; |
155 | } | |
51e0a012 | 156 | |
25cd2882 SS |
157 | if (!udev->parent || udev->parent->lpm_capable) |
158 | return 1; | |
d9b2099c SS |
159 | return 0; |
160 | } | |
161 | ||
51e0a012 SS |
162 | /* |
163 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
164 | * either U1 or U2. | |
165 | */ | |
166 | static void usb_set_lpm_mel(struct usb_device *udev, | |
167 | struct usb3_lpm_parameters *udev_lpm_params, | |
168 | unsigned int udev_exit_latency, | |
169 | struct usb_hub *hub, | |
170 | struct usb3_lpm_parameters *hub_lpm_params, | |
171 | unsigned int hub_exit_latency) | |
172 | { | |
173 | unsigned int total_mel; | |
174 | unsigned int device_mel; | |
175 | unsigned int hub_mel; | |
176 | ||
177 | /* | |
178 | * Calculate the time it takes to transition all links from the roothub | |
179 | * to the parent hub into U0. The parent hub must then decode the | |
180 | * packet (hub header decode latency) to figure out which port it was | |
181 | * bound for. | |
182 | * | |
183 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
184 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
185 | */ | |
186 | total_mel = hub_lpm_params->mel + | |
187 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
188 | ||
189 | /* | |
190 | * How long will it take to transition the downstream hub's port into | |
191 | * U0? The greater of either the hub exit latency or the device exit | |
192 | * latency. | |
193 | * | |
194 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
195 | * Multiply that by 1000 to get nanoseconds. | |
196 | */ | |
197 | device_mel = udev_exit_latency * 1000; | |
198 | hub_mel = hub_exit_latency * 1000; | |
199 | if (device_mel > hub_mel) | |
200 | total_mel += device_mel; | |
201 | else | |
202 | total_mel += hub_mel; | |
203 | ||
204 | udev_lpm_params->mel = total_mel; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
209 | * a transition from either U1 or U2. | |
210 | */ | |
211 | static void usb_set_lpm_pel(struct usb_device *udev, | |
212 | struct usb3_lpm_parameters *udev_lpm_params, | |
213 | unsigned int udev_exit_latency, | |
214 | struct usb_hub *hub, | |
215 | struct usb3_lpm_parameters *hub_lpm_params, | |
216 | unsigned int hub_exit_latency, | |
217 | unsigned int port_to_port_exit_latency) | |
218 | { | |
219 | unsigned int first_link_pel; | |
220 | unsigned int hub_pel; | |
221 | ||
222 | /* | |
223 | * First, the device sends an LFPS to transition the link between the | |
224 | * device and the parent hub into U0. The exit latency is the bigger of | |
225 | * the device exit latency or the hub exit latency. | |
226 | */ | |
227 | if (udev_exit_latency > hub_exit_latency) | |
228 | first_link_pel = udev_exit_latency * 1000; | |
229 | else | |
230 | first_link_pel = hub_exit_latency * 1000; | |
231 | ||
232 | /* | |
233 | * When the hub starts to receive the LFPS, there is a slight delay for | |
234 | * it to figure out that one of the ports is sending an LFPS. Then it | |
235 | * will forward the LFPS to its upstream link. The exit latency is the | |
236 | * delay, plus the PEL that we calculated for this hub. | |
237 | */ | |
238 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
239 | ||
240 | /* | |
241 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
242 | * is the greater of the two exit latencies. | |
243 | */ | |
244 | if (first_link_pel > hub_pel) | |
245 | udev_lpm_params->pel = first_link_pel; | |
246 | else | |
247 | udev_lpm_params->pel = hub_pel; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
252 | * when a device initiates a transition to U0, until when it will receive the | |
253 | * first packet from the host controller. | |
254 | * | |
255 | * Section C.1.5.1 describes the four components to this: | |
256 | * - t1: device PEL | |
257 | * - t2: time for the ERDY to make it from the device to the host. | |
258 | * - t3: a host-specific delay to process the ERDY. | |
259 | * - t4: time for the packet to make it from the host to the device. | |
260 | * | |
261 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
262 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
263 | * vendor says otherwise. | |
264 | */ | |
265 | static void usb_set_lpm_sel(struct usb_device *udev, | |
266 | struct usb3_lpm_parameters *udev_lpm_params) | |
267 | { | |
268 | struct usb_device *parent; | |
269 | unsigned int num_hubs; | |
270 | unsigned int total_sel; | |
271 | ||
272 | /* t1 = device PEL */ | |
273 | total_sel = udev_lpm_params->pel; | |
274 | /* How many external hubs are in between the device & the root port. */ | |
275 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
276 | parent = parent->parent) | |
277 | num_hubs++; | |
278 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
279 | if (num_hubs > 0) | |
280 | total_sel += 2100 + 250 * (num_hubs - 1); | |
281 | ||
282 | /* t4 = 250ns * num_hubs */ | |
283 | total_sel += 250 * num_hubs; | |
284 | ||
285 | udev_lpm_params->sel = total_sel; | |
286 | } | |
287 | ||
288 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
289 | { | |
290 | struct usb_hub *hub; | |
291 | unsigned int port_to_port_delay; | |
292 | unsigned int udev_u1_del; | |
293 | unsigned int udev_u2_del; | |
294 | unsigned int hub_u1_del; | |
295 | unsigned int hub_u2_del; | |
296 | ||
297 | if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) | |
298 | return; | |
299 | ||
ad493e5e | 300 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
301 | /* It doesn't take time to transition the roothub into U0, since it |
302 | * doesn't have an upstream link. | |
303 | */ | |
304 | if (!hub) | |
305 | return; | |
306 | ||
307 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
4d967995 | 308 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
51e0a012 | 309 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
4d967995 | 310 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
51e0a012 SS |
311 | |
312 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
313 | hub, &udev->parent->u1_params, hub_u1_del); | |
314 | ||
315 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
316 | hub, &udev->parent->u2_params, hub_u2_del); | |
317 | ||
318 | /* | |
319 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
320 | * when the parent hub notices the downstream port is trying to | |
321 | * transition to U0 to when the hub initiates a U0 transition on its | |
322 | * upstream port. The section says the delays are tPort2PortU1EL and | |
323 | * tPort2PortU2EL, but it doesn't define what they are. | |
324 | * | |
325 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
326 | * about the same delays. Use the maximum delay calculations from those | |
327 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
328 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
329 | * assume the device exit latencies they are talking about are the hub | |
330 | * exit latencies. | |
331 | * | |
332 | * What do we do if the U2 exit latency is less than the U1 exit | |
333 | * latency? It's possible, although not likely... | |
334 | */ | |
335 | port_to_port_delay = 1; | |
336 | ||
337 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
338 | hub, &udev->parent->u1_params, hub_u1_del, | |
339 | port_to_port_delay); | |
340 | ||
341 | if (hub_u2_del > hub_u1_del) | |
342 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
343 | else | |
344 | port_to_port_delay = 1 + hub_u1_del; | |
345 | ||
346 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
347 | hub, &udev->parent->u2_params, hub_u2_del, | |
348 | port_to_port_delay); | |
349 | ||
350 | /* Now that we've got PEL, calculate SEL. */ | |
351 | usb_set_lpm_sel(udev, &udev->u1_params); | |
352 | usb_set_lpm_sel(udev, &udev->u2_params); | |
353 | } | |
354 | ||
1da177e4 | 355 | /* USB 2.0 spec Section 11.24.4.5 */ |
dbe79bbe | 356 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
1da177e4 | 357 | { |
dbe79bbe JY |
358 | int i, ret, size; |
359 | unsigned dtype; | |
360 | ||
361 | if (hub_is_superspeed(hdev)) { | |
362 | dtype = USB_DT_SS_HUB; | |
363 | size = USB_DT_SS_HUB_SIZE; | |
364 | } else { | |
365 | dtype = USB_DT_HUB; | |
366 | size = sizeof(struct usb_hub_descriptor); | |
367 | } | |
1da177e4 LT |
368 | |
369 | for (i = 0; i < 3; i++) { | |
370 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
371 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
dbe79bbe | 372 | dtype << 8, 0, data, size, |
1da177e4 LT |
373 | USB_CTRL_GET_TIMEOUT); |
374 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
375 | return ret; | |
376 | } | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | /* | |
381 | * USB 2.0 spec Section 11.24.2.1 | |
382 | */ | |
383 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
384 | { | |
385 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
386 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
387 | } | |
388 | ||
389 | /* | |
390 | * USB 2.0 spec Section 11.24.2.2 | |
391 | */ | |
ad493e5e | 392 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
393 | { |
394 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
395 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
396 | NULL, 0, 1000); | |
397 | } | |
398 | ||
399 | /* | |
400 | * USB 2.0 spec Section 11.24.2.13 | |
401 | */ | |
402 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
403 | { | |
404 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
405 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
406 | NULL, 0, 1000); | |
407 | } | |
408 | ||
d99f6b41 DW |
409 | static char *to_led_name(int selector) |
410 | { | |
411 | switch (selector) { | |
412 | case HUB_LED_AMBER: | |
413 | return "amber"; | |
414 | case HUB_LED_GREEN: | |
415 | return "green"; | |
416 | case HUB_LED_OFF: | |
417 | return "off"; | |
418 | case HUB_LED_AUTO: | |
419 | return "auto"; | |
420 | default: | |
421 | return "??"; | |
422 | } | |
423 | } | |
424 | ||
1da177e4 LT |
425 | /* |
426 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
427 | * for info about using port indicators | |
428 | */ | |
d99f6b41 | 429 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
1da177e4 | 430 | { |
d99f6b41 DW |
431 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
432 | int status; | |
433 | ||
434 | status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
1da177e4 | 435 | USB_PORT_FEAT_INDICATOR); |
d99f6b41 DW |
436 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
437 | to_led_name(selector), status); | |
1da177e4 LT |
438 | } |
439 | ||
440 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
441 | ||
c4028958 | 442 | static void led_work (struct work_struct *work) |
1da177e4 | 443 | { |
c4028958 DH |
444 | struct usb_hub *hub = |
445 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
446 | struct usb_device *hdev = hub->hdev; |
447 | unsigned i; | |
448 | unsigned changed = 0; | |
449 | int cursor = -1; | |
450 | ||
451 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
452 | return; | |
453 | ||
3bbc47d8 | 454 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
455 | unsigned selector, mode; |
456 | ||
457 | /* 30%-50% duty cycle */ | |
458 | ||
459 | switch (hub->indicator[i]) { | |
460 | /* cycle marker */ | |
461 | case INDICATOR_CYCLE: | |
462 | cursor = i; | |
463 | selector = HUB_LED_AUTO; | |
464 | mode = INDICATOR_AUTO; | |
465 | break; | |
466 | /* blinking green = sw attention */ | |
467 | case INDICATOR_GREEN_BLINK: | |
468 | selector = HUB_LED_GREEN; | |
469 | mode = INDICATOR_GREEN_BLINK_OFF; | |
470 | break; | |
471 | case INDICATOR_GREEN_BLINK_OFF: | |
472 | selector = HUB_LED_OFF; | |
473 | mode = INDICATOR_GREEN_BLINK; | |
474 | break; | |
475 | /* blinking amber = hw attention */ | |
476 | case INDICATOR_AMBER_BLINK: | |
477 | selector = HUB_LED_AMBER; | |
478 | mode = INDICATOR_AMBER_BLINK_OFF; | |
479 | break; | |
480 | case INDICATOR_AMBER_BLINK_OFF: | |
481 | selector = HUB_LED_OFF; | |
482 | mode = INDICATOR_AMBER_BLINK; | |
483 | break; | |
484 | /* blink green/amber = reserved */ | |
485 | case INDICATOR_ALT_BLINK: | |
486 | selector = HUB_LED_GREEN; | |
487 | mode = INDICATOR_ALT_BLINK_OFF; | |
488 | break; | |
489 | case INDICATOR_ALT_BLINK_OFF: | |
490 | selector = HUB_LED_AMBER; | |
491 | mode = INDICATOR_ALT_BLINK; | |
492 | break; | |
493 | default: | |
494 | continue; | |
495 | } | |
496 | if (selector != HUB_LED_AUTO) | |
497 | changed = 1; | |
498 | set_port_led(hub, i + 1, selector); | |
499 | hub->indicator[i] = mode; | |
500 | } | |
501 | if (!changed && blinkenlights) { | |
502 | cursor++; | |
3bbc47d8 | 503 | cursor %= hdev->maxchild; |
1da177e4 LT |
504 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
505 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
506 | changed++; | |
507 | } | |
508 | if (changed) | |
22f6a0f0 SD |
509 | queue_delayed_work(system_power_efficient_wq, |
510 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
511 | } |
512 | ||
513 | /* use a short timeout for hub/port status fetches */ | |
514 | #define USB_STS_TIMEOUT 1000 | |
515 | #define USB_STS_RETRIES 5 | |
516 | ||
517 | /* | |
518 | * USB 2.0 spec Section 11.24.2.6 | |
519 | */ | |
520 | static int get_hub_status(struct usb_device *hdev, | |
521 | struct usb_hub_status *data) | |
522 | { | |
523 | int i, status = -ETIMEDOUT; | |
524 | ||
3824c1dd LP |
525 | for (i = 0; i < USB_STS_RETRIES && |
526 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
527 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
528 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
529 | data, sizeof(*data), USB_STS_TIMEOUT); | |
530 | } | |
531 | return status; | |
532 | } | |
533 | ||
534 | /* | |
535 | * USB 2.0 spec Section 11.24.2.7 | |
536 | */ | |
537 | static int get_port_status(struct usb_device *hdev, int port1, | |
538 | struct usb_port_status *data) | |
539 | { | |
540 | int i, status = -ETIMEDOUT; | |
541 | ||
3824c1dd LP |
542 | for (i = 0; i < USB_STS_RETRIES && |
543 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
544 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
545 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
546 | data, sizeof(*data), USB_STS_TIMEOUT); | |
547 | } | |
548 | return status; | |
549 | } | |
550 | ||
3eb14915 AS |
551 | static int hub_port_status(struct usb_hub *hub, int port1, |
552 | u16 *status, u16 *change) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | mutex_lock(&hub->status_mutex); | |
557 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
558 | if (ret < 4) { | |
e9e88fb7 AS |
559 | if (ret != -ENODEV) |
560 | dev_err(hub->intfdev, | |
561 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
562 | if (ret >= 0) |
563 | ret = -EIO; | |
564 | } else { | |
565 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
566 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
dbe79bbe | 567 | |
3eb14915 AS |
568 | ret = 0; |
569 | } | |
570 | mutex_unlock(&hub->status_mutex); | |
571 | return ret; | |
572 | } | |
573 | ||
32a69589 | 574 | static void kick_hub_wq(struct usb_hub *hub) |
1da177e4 | 575 | { |
32a69589 | 576 | struct usb_interface *intf; |
1da177e4 | 577 | |
32a69589 PM |
578 | if (hub->disconnected || work_pending(&hub->events)) |
579 | return; | |
8e4ceb38 | 580 | |
32a69589 PM |
581 | /* |
582 | * Suppress autosuspend until the event is proceed. | |
583 | * | |
584 | * Be careful and make sure that the symmetric operation is | |
585 | * always called. We are here only when there is no pending | |
586 | * work for this hub. Therefore put the interface either when | |
587 | * the new work is called or when it is canceled. | |
588 | */ | |
589 | intf = to_usb_interface(hub->intfdev); | |
590 | usb_autopm_get_interface_no_resume(intf); | |
591 | kref_get(&hub->kref); | |
592 | ||
593 | if (queue_work(hub_wq, &hub->events)) | |
594 | return; | |
595 | ||
596 | /* the work has already been scheduled */ | |
597 | usb_autopm_put_interface_async(intf); | |
598 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
599 | } |
600 | ||
59d48b3f | 601 | void usb_kick_hub_wq(struct usb_device *hdev) |
1da177e4 | 602 | { |
ad493e5e | 603 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
604 | |
605 | if (hub) | |
32a69589 | 606 | kick_hub_wq(hub); |
1da177e4 LT |
607 | } |
608 | ||
4ee823b8 SS |
609 | /* |
610 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
611 | * Notification, which indicates it had initiated remote wakeup. | |
612 | * | |
613 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
614 | * device initiates resume, so the USB core will not receive notice of the | |
615 | * resume through the normal hub interrupt URB. | |
616 | */ | |
617 | void usb_wakeup_notification(struct usb_device *hdev, | |
618 | unsigned int portnum) | |
619 | { | |
620 | struct usb_hub *hub; | |
621 | ||
622 | if (!hdev) | |
623 | return; | |
624 | ||
ad493e5e | 625 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
626 | if (hub) { |
627 | set_bit(portnum, hub->wakeup_bits); | |
32a69589 | 628 | kick_hub_wq(hub); |
4ee823b8 SS |
629 | } |
630 | } | |
631 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
632 | |
633 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 634 | static void hub_irq(struct urb *urb) |
1da177e4 | 635 | { |
ec17cf1c | 636 | struct usb_hub *hub = urb->context; |
e015268d | 637 | int status = urb->status; |
71d2718f | 638 | unsigned i; |
1da177e4 LT |
639 | unsigned long bits; |
640 | ||
e015268d | 641 | switch (status) { |
1da177e4 LT |
642 | case -ENOENT: /* synchronous unlink */ |
643 | case -ECONNRESET: /* async unlink */ | |
644 | case -ESHUTDOWN: /* hardware going away */ | |
645 | return; | |
646 | ||
647 | default: /* presumably an error */ | |
648 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 649 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
650 | if ((++hub->nerrors < 10) || hub->error) |
651 | goto resubmit; | |
e015268d | 652 | hub->error = status; |
1da177e4 | 653 | /* FALL THROUGH */ |
ec17cf1c | 654 | |
1da177e4 LT |
655 | /* let khubd handle things */ |
656 | case 0: /* we got data: port status changed */ | |
657 | bits = 0; | |
658 | for (i = 0; i < urb->actual_length; ++i) | |
659 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
660 | << (i*8); | |
661 | hub->event_bits[0] = bits; | |
662 | break; | |
663 | } | |
664 | ||
665 | hub->nerrors = 0; | |
666 | ||
667 | /* Something happened, let khubd figure it out */ | |
32a69589 | 668 | kick_hub_wq(hub); |
1da177e4 LT |
669 | |
670 | resubmit: | |
671 | if (hub->quiescing) | |
672 | return; | |
673 | ||
674 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
675 | && status != -ENODEV && status != -EPERM) | |
676 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
677 | } | |
678 | ||
679 | /* USB 2.0 spec Section 11.24.2.3 */ | |
680 | static inline int | |
681 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
682 | { | |
2c7b871b WG |
683 | /* Need to clear both directions for control ep */ |
684 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
685 | USB_ENDPOINT_XFER_CONTROL) { | |
686 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
687 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
688 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
689 | if (status) | |
690 | return status; | |
691 | } | |
c2f6595f | 692 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
693 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
694 | tt, NULL, 0, 1000); | |
695 | } | |
696 | ||
697 | /* | |
698 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
699 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
700 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
701 | * both can talk to the same hub concurrently. | |
702 | */ | |
cb88a1b8 | 703 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 704 | { |
c4028958 | 705 | struct usb_hub *hub = |
cb88a1b8 | 706 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
707 | unsigned long flags; |
708 | ||
709 | spin_lock_irqsave (&hub->tt.lock, flags); | |
3b6054da | 710 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 711 | struct list_head *next; |
1da177e4 LT |
712 | struct usb_tt_clear *clear; |
713 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 714 | const struct hc_driver *drv; |
1da177e4 LT |
715 | int status; |
716 | ||
d0f830d3 HS |
717 | next = hub->tt.clear_list.next; |
718 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
719 | list_del (&clear->clear_list); |
720 | ||
721 | /* drop lock so HCD can concurrently report other TT errors */ | |
722 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
723 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 724 | if (status && status != -ENODEV) |
1da177e4 LT |
725 | dev_err (&hdev->dev, |
726 | "clear tt %d (%04x) error %d\n", | |
727 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
728 | |
729 | /* Tell the HCD, even if the operation failed */ | |
730 | drv = clear->hcd->driver; | |
731 | if (drv->clear_tt_buffer_complete) | |
732 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
733 | ||
1bc3c9e1 | 734 | kfree(clear); |
cb88a1b8 | 735 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
736 | } |
737 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
738 | } | |
739 | ||
971fcd49 LT |
740 | /** |
741 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
742 | * @hdev: USB device belonging to the usb hub |
743 | * @hub: target hub | |
971fcd49 LT |
744 | * @port1: port index |
745 | * @set: expected status | |
746 | * | |
747 | * call this function to control port's power via setting or | |
748 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
749 | * |
750 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 751 | */ |
41341261 MN |
752 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
753 | int port1, bool set) | |
971fcd49 LT |
754 | { |
755 | int ret; | |
756 | ||
757 | if (set) | |
758 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
759 | else | |
ad493e5e LT |
760 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
761 | ||
d5c3834e DW |
762 | if (ret) |
763 | return ret; | |
764 | ||
765 | if (set) | |
766 | set_bit(port1, hub->power_bits); | |
767 | else | |
768 | clear_bit(port1, hub->power_bits); | |
769 | return 0; | |
971fcd49 LT |
770 | } |
771 | ||
1da177e4 | 772 | /** |
cb88a1b8 AS |
773 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
774 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
775 | * |
776 | * High speed HCDs use this to tell the hub driver that some split control or | |
777 | * bulk transaction failed in a way that requires clearing internal state of | |
778 | * a transaction translator. This is normally detected (and reported) from | |
779 | * interrupt context. | |
780 | * | |
781 | * It may not be possible for that hub to handle additional full (or low) | |
782 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
783 | * |
784 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 785 | */ |
cb88a1b8 | 786 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 787 | { |
cb88a1b8 AS |
788 | struct usb_device *udev = urb->dev; |
789 | int pipe = urb->pipe; | |
1da177e4 LT |
790 | struct usb_tt *tt = udev->tt; |
791 | unsigned long flags; | |
792 | struct usb_tt_clear *clear; | |
793 | ||
794 | /* we've got to cope with an arbitrary number of pending TT clears, | |
795 | * since each TT has "at least two" buffers that can need it (and | |
796 | * there can be many TTs per hub). even if they're uncommon. | |
797 | */ | |
54e6ecb2 | 798 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
799 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
800 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 801 | return -ENOMEM; |
1da177e4 LT |
802 | } |
803 | ||
804 | /* info that CLEAR_TT_BUFFER needs */ | |
805 | clear->tt = tt->multi ? udev->ttport : 1; | |
806 | clear->devinfo = usb_pipeendpoint (pipe); | |
807 | clear->devinfo |= udev->devnum << 4; | |
808 | clear->devinfo |= usb_pipecontrol (pipe) | |
809 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
810 | : (USB_ENDPOINT_XFER_BULK << 11); | |
811 | if (usb_pipein (pipe)) | |
812 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
813 | |
814 | /* info for completion callback */ | |
815 | clear->hcd = bus_to_hcd(udev->bus); | |
816 | clear->ep = urb->ep; | |
817 | ||
1da177e4 LT |
818 | /* tell keventd to clear state for this TT */ |
819 | spin_lock_irqsave (&tt->lock, flags); | |
820 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 821 | schedule_work(&tt->clear_work); |
1da177e4 | 822 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 823 | return 0; |
1da177e4 | 824 | } |
cb88a1b8 | 825 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 826 | |
7ad3c470 | 827 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
1da177e4 LT |
828 | { |
829 | int port1; | |
4489a571 AS |
830 | |
831 | /* Enable power on each port. Some hubs have reserved values | |
832 | * of LPSM (> 2) in their descriptors, even though they are | |
833 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
834 | * but only emulate it. In all cases, the ports won't work | |
835 | * unless we send these messages to the hub. | |
836 | */ | |
9262c19d | 837 | if (hub_is_port_power_switchable(hub)) |
1da177e4 | 838 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
839 | else |
840 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
841 | "non-switchable hub\n"); | |
3bbc47d8 | 842 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
d5c3834e | 843 | if (test_bit(port1, hub->power_bits)) |
ad493e5e LT |
844 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
845 | else | |
846 | usb_clear_port_feature(hub->hdev, port1, | |
847 | USB_PORT_FEAT_POWER); | |
8520f380 | 848 | if (do_delay) |
7ad3c470 | 849 | msleep(hub_power_on_good_delay(hub)); |
1da177e4 LT |
850 | } |
851 | ||
1da177e4 LT |
852 | static int hub_hub_status(struct usb_hub *hub, |
853 | u16 *status, u16 *change) | |
854 | { | |
855 | int ret; | |
856 | ||
db90e7a1 | 857 | mutex_lock(&hub->status_mutex); |
1da177e4 | 858 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
859 | if (ret < 0) { |
860 | if (ret != -ENODEV) | |
861 | dev_err(hub->intfdev, | |
862 | "%s failed (err = %d)\n", __func__, ret); | |
863 | } else { | |
1da177e4 | 864 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 865 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
866 | ret = 0; |
867 | } | |
db90e7a1 | 868 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
869 | return ret; |
870 | } | |
871 | ||
41e7e056 SS |
872 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
873 | unsigned int link_status) | |
874 | { | |
875 | return set_port_feature(hub->hdev, | |
876 | port1 | (link_status << 3), | |
877 | USB_PORT_FEAT_LINK_STATE); | |
878 | } | |
879 | ||
880 | /* | |
881 | * If USB 3.0 ports are placed into the Disabled state, they will no longer | |
882 | * detect any device connects or disconnects. This is generally not what the | |
883 | * USB core wants, since it expects a disabled port to produce a port status | |
884 | * change event when a new device connects. | |
885 | * | |
886 | * Instead, set the link state to Disabled, wait for the link to settle into | |
887 | * that state, clear any change bits, and then put the port into the RxDetect | |
888 | * state. | |
889 | */ | |
890 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) | |
891 | { | |
892 | int ret; | |
893 | int total_time; | |
894 | u16 portchange, portstatus; | |
895 | ||
896 | if (!hub_is_superspeed(hub->hdev)) | |
897 | return -EINVAL; | |
898 | ||
bb86cf56 GG |
899 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
900 | if (ret < 0) | |
901 | return ret; | |
902 | ||
903 | /* | |
904 | * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI | |
905 | * Controller [1022:7814] will have spurious result making the following | |
906 | * usb 3.0 device hotplugging route to the 2.0 root hub and recognized | |
907 | * as high-speed device if we set the usb 3.0 port link state to | |
908 | * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we | |
909 | * check the state here to avoid the bug. | |
910 | */ | |
911 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
912 | USB_SS_PORT_LS_RX_DETECT) { | |
913 | dev_dbg(&hub->ports[port1 - 1]->dev, | |
914 | "Not disabling port; link state is RxDetect\n"); | |
915 | return ret; | |
916 | } | |
917 | ||
41e7e056 | 918 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); |
e9e88fb7 | 919 | if (ret) |
41e7e056 | 920 | return ret; |
41e7e056 SS |
921 | |
922 | /* Wait for the link to enter the disabled state. */ | |
923 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
924 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
925 | if (ret < 0) | |
926 | return ret; | |
927 | ||
928 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
929 | USB_SS_PORT_LS_SS_DISABLED) | |
930 | break; | |
931 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
932 | break; | |
933 | msleep(HUB_DEBOUNCE_STEP); | |
934 | } | |
935 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
d99f6b41 DW |
936 | dev_warn(&hub->ports[port1 - 1]->dev, |
937 | "Could not disable after %d ms\n", total_time); | |
41e7e056 SS |
938 | |
939 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); | |
940 | } | |
941 | ||
8b28c752 AS |
942 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
943 | { | |
d99f6b41 | 944 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
8b28c752 | 945 | struct usb_device *hdev = hub->hdev; |
0458d5b4 | 946 | int ret = 0; |
8b28c752 | 947 | |
d99f6b41 DW |
948 | if (port_dev->child && set_state) |
949 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); | |
41e7e056 SS |
950 | if (!hub->error) { |
951 | if (hub_is_superspeed(hub->hdev)) | |
952 | ret = hub_usb3_port_disable(hub, port1); | |
953 | else | |
ad493e5e | 954 | ret = usb_clear_port_feature(hdev, port1, |
41e7e056 SS |
955 | USB_PORT_FEAT_ENABLE); |
956 | } | |
e9e88fb7 | 957 | if (ret && ret != -ENODEV) |
d99f6b41 | 958 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
8b28c752 AS |
959 | return ret; |
960 | } | |
961 | ||
0458d5b4 | 962 | /* |
6d42fcdb | 963 | * Disable a port and mark a logical connect-change event, so that some |
0458d5b4 AS |
964 | * time later khubd will disconnect() any existing usb_device on the port |
965 | * and will re-enumerate if there actually is a device attached. | |
966 | */ | |
967 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
968 | { | |
d99f6b41 | 969 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
0458d5b4 | 970 | hub_port_disable(hub, port1, 1); |
7d069b7d | 971 | |
0458d5b4 AS |
972 | /* FIXME let caller ask to power down the port: |
973 | * - some devices won't enumerate without a VBUS power cycle | |
974 | * - SRP saves power that way | |
975 | * - ... new call, TBD ... | |
976 | * That's easy if this hub can switch power per-port, and | |
977 | * khubd reactivates the port later (timer, SRP, etc). | |
978 | * Powerdown must be optional, because of reset/DFU. | |
979 | */ | |
980 | ||
981 | set_bit(port1, hub->change_bits); | |
32a69589 | 982 | kick_hub_wq(hub); |
0458d5b4 AS |
983 | } |
984 | ||
253e0572 AS |
985 | /** |
986 | * usb_remove_device - disable a device's port on its parent hub | |
987 | * @udev: device to be disabled and removed | |
988 | * Context: @udev locked, must be able to sleep. | |
989 | * | |
990 | * After @udev's port has been disabled, khubd is notified and it will | |
991 | * see that the device has been disconnected. When the device is | |
992 | * physically unplugged and something is plugged in, the events will | |
993 | * be received and processed normally. | |
626f090c YB |
994 | * |
995 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
996 | */ |
997 | int usb_remove_device(struct usb_device *udev) | |
998 | { | |
999 | struct usb_hub *hub; | |
1000 | struct usb_interface *intf; | |
1001 | ||
1002 | if (!udev->parent) /* Can't remove a root hub */ | |
1003 | return -EINVAL; | |
ad493e5e | 1004 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
1005 | intf = to_usb_interface(hub->intfdev); |
1006 | ||
1007 | usb_autopm_get_interface(intf); | |
1008 | set_bit(udev->portnum, hub->removed_bits); | |
1009 | hub_port_logical_disconnect(hub, udev->portnum); | |
1010 | usb_autopm_put_interface(intf); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
6ee0b270 | 1014 | enum hub_activation_type { |
8e4ceb38 | 1015 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 1016 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 1017 | }; |
5e6effae | 1018 | |
8520f380 AS |
1019 | static void hub_init_func2(struct work_struct *ws); |
1020 | static void hub_init_func3(struct work_struct *ws); | |
1021 | ||
f2835219 | 1022 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
1023 | { |
1024 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
1025 | struct usb_hcd *hcd; |
1026 | int ret; | |
5e6effae | 1027 | int port1; |
f2835219 | 1028 | int status; |
948fea37 | 1029 | bool need_debounce_delay = false; |
8520f380 AS |
1030 | unsigned delay; |
1031 | ||
1032 | /* Continue a partial initialization */ | |
1033 | if (type == HUB_INIT2) | |
1034 | goto init2; | |
1035 | if (type == HUB_INIT3) | |
1036 | goto init3; | |
5e6effae | 1037 | |
a45aa3b3 EF |
1038 | /* The superspeed hub except for root hub has to use Hub Depth |
1039 | * value as an offset into the route string to locate the bits | |
1040 | * it uses to determine the downstream port number. So hub driver | |
1041 | * should send a set hub depth request to superspeed hub after | |
1042 | * the superspeed hub is set configuration in initialization or | |
1043 | * reset procedure. | |
1044 | * | |
1045 | * After a resume, port power should still be on. | |
f2835219 AS |
1046 | * For any other type of activation, turn it on. |
1047 | */ | |
8520f380 | 1048 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1049 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1050 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1051 | HUB_SET_DEPTH, USB_RT_HUB, | |
1052 | hdev->level - 1, 0, NULL, 0, | |
1053 | USB_CTRL_SET_TIMEOUT); | |
1054 | if (ret < 0) | |
1055 | dev_err(hub->intfdev, | |
1056 | "set hub depth failed\n"); | |
1057 | } | |
8520f380 AS |
1058 | |
1059 | /* Speed up system boot by using a delayed_work for the | |
1060 | * hub's initial power-up delays. This is pretty awkward | |
1061 | * and the implementation looks like a home-brewed sort of | |
1062 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1063 | * root hub (assuming usbcore is compiled into the kernel | |
1064 | * rather than as a module). It adds up. | |
1065 | * | |
1066 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1067 | * because for those activation types the ports have to be | |
1068 | * operational when we return. In theory this could be done | |
1069 | * for HUB_POST_RESET, but it's easier not to. | |
1070 | */ | |
1071 | if (type == HUB_INIT) { | |
7ad3c470 DW |
1072 | unsigned delay = hub_power_on_good_delay(hub); |
1073 | ||
1074 | hub_power_on(hub, false); | |
77fa83cf | 1075 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
22f6a0f0 SD |
1076 | queue_delayed_work(system_power_efficient_wq, |
1077 | &hub->init_work, | |
8520f380 | 1078 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1079 | |
1080 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1081 | usb_autopm_get_interface_no_resume( |
1082 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1083 | return; /* Continues at init2: below */ |
653a39d1 SS |
1084 | } else if (type == HUB_RESET_RESUME) { |
1085 | /* The internal host controller state for the hub device | |
1086 | * may be gone after a host power loss on system resume. | |
1087 | * Update the device's info so the HW knows it's a hub. | |
1088 | */ | |
1089 | hcd = bus_to_hcd(hdev->bus); | |
1090 | if (hcd->driver->update_hub_device) { | |
1091 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1092 | &hub->tt, GFP_NOIO); | |
1093 | if (ret < 0) { | |
1094 | dev_err(hub->intfdev, "Host not " | |
1095 | "accepting hub info " | |
1096 | "update.\n"); | |
1097 | dev_err(hub->intfdev, "LS/FS devices " | |
1098 | "and hubs may not work " | |
1099 | "under this hub\n."); | |
1100 | } | |
1101 | } | |
1102 | hub_power_on(hub, true); | |
8520f380 AS |
1103 | } else { |
1104 | hub_power_on(hub, true); | |
1105 | } | |
1106 | } | |
1107 | init2: | |
f2835219 | 1108 | |
d99f6b41 DW |
1109 | /* |
1110 | * Check each port and set hub->change_bits to let khubd know | |
6ee0b270 | 1111 | * which ports need attention. |
5e6effae AS |
1112 | */ |
1113 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
1114 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1115 | struct usb_device *udev = port_dev->child; | |
5e6effae AS |
1116 | u16 portstatus, portchange; |
1117 | ||
6ee0b270 AS |
1118 | portstatus = portchange = 0; |
1119 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1120 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
d99f6b41 DW |
1121 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
1122 | portstatus, portchange); | |
6ee0b270 | 1123 | |
d99f6b41 DW |
1124 | /* |
1125 | * After anything other than HUB_RESUME (i.e., initialization | |
6ee0b270 AS |
1126 | * or any sort of reset), every port should be disabled. |
1127 | * Unconnected ports should likewise be disabled (paranoia), | |
1128 | * and so should ports for which we have no usb_device. | |
1129 | */ | |
1130 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1131 | type != HUB_RESUME || | |
1132 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1133 | !udev || | |
1134 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1135 | /* |
1136 | * USB3 protocol ports will automatically transition | |
1137 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1138 | * Do not disable USB3 protocol ports, just pretend |
1139 | * power was lost | |
9f0a6cd3 | 1140 | */ |
fd1ac4cf DW |
1141 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1142 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1143 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1144 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1145 | } |
1146 | ||
948fea37 AS |
1147 | /* Clear status-change flags; we'll debounce later */ |
1148 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1149 | need_debounce_delay = true; | |
ad493e5e | 1150 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1151 | USB_PORT_FEAT_C_CONNECTION); |
1152 | } | |
1153 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1154 | need_debounce_delay = true; | |
ad493e5e | 1155 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1156 | USB_PORT_FEAT_C_ENABLE); |
1157 | } | |
e92aee33 JW |
1158 | if (portchange & USB_PORT_STAT_C_RESET) { |
1159 | need_debounce_delay = true; | |
1160 | usb_clear_port_feature(hub->hdev, port1, | |
1161 | USB_PORT_FEAT_C_RESET); | |
1162 | } | |
79c3dd81 DZ |
1163 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1164 | hub_is_superspeed(hub->hdev)) { | |
1165 | need_debounce_delay = true; | |
ad493e5e | 1166 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1167 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1168 | } | |
253e0572 AS |
1169 | /* We can forget about a "removed" device when there's a |
1170 | * physical disconnect or the connect status changes. | |
1171 | */ | |
1172 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1173 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1174 | clear_bit(port1, hub->removed_bits); | |
1175 | ||
6ee0b270 AS |
1176 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
1177 | /* Tell khubd to disconnect the device or | |
1178 | * check for a new connection | |
1179 | */ | |
08d1dec6 SG |
1180 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
1181 | (portstatus & USB_PORT_STAT_OVERCURRENT)) | |
6ee0b270 AS |
1182 | set_bit(port1, hub->change_bits); |
1183 | ||
1184 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1185 | bool port_resumed = (portstatus & |
1186 | USB_PORT_STAT_LINK_STATE) == | |
1187 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1188 | /* The power session apparently survived the resume. |
1189 | * If there was an overcurrent or suspend change | |
1190 | * (i.e., remote wakeup request), have khubd | |
72937e1e SS |
1191 | * take care of it. Look at the port link state |
1192 | * for USB 3.0 hubs, since they don't have a suspend | |
1193 | * change bit, and they don't set the port link change | |
1194 | * bit on device-initiated resume. | |
6ee0b270 | 1195 | */ |
72937e1e SS |
1196 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1197 | port_resumed)) | |
6ee0b270 | 1198 | set_bit(port1, hub->change_bits); |
5e6effae | 1199 | |
6ee0b270 | 1200 | } else if (udev->persist_enabled) { |
6ee0b270 | 1201 | #ifdef CONFIG_PM |
5e6effae | 1202 | udev->reset_resume = 1; |
6ee0b270 | 1203 | #endif |
ad493e5e LT |
1204 | /* Don't set the change_bits when the device |
1205 | * was powered off. | |
1206 | */ | |
d5c3834e | 1207 | if (test_bit(port1, hub->power_bits)) |
ad493e5e | 1208 | set_bit(port1, hub->change_bits); |
8808f00c | 1209 | |
6ee0b270 AS |
1210 | } else { |
1211 | /* The power session is gone; tell khubd */ | |
1212 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1213 | set_bit(port1, hub->change_bits); | |
5e6effae | 1214 | } |
5e6effae AS |
1215 | } |
1216 | ||
948fea37 AS |
1217 | /* If no port-status-change flags were set, we don't need any |
1218 | * debouncing. If flags were set we can try to debounce the | |
1219 | * ports all at once right now, instead of letting khubd do them | |
1220 | * one at a time later on. | |
1221 | * | |
1222 | * If any port-status changes do occur during this delay, khubd | |
1223 | * will see them later and handle them normally. | |
1224 | */ | |
8520f380 AS |
1225 | if (need_debounce_delay) { |
1226 | delay = HUB_DEBOUNCE_STABLE; | |
1227 | ||
1228 | /* Don't do a long sleep inside a workqueue routine */ | |
1229 | if (type == HUB_INIT2) { | |
77fa83cf | 1230 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
22f6a0f0 SD |
1231 | queue_delayed_work(system_power_efficient_wq, |
1232 | &hub->init_work, | |
8520f380 AS |
1233 | msecs_to_jiffies(delay)); |
1234 | return; /* Continues at init3: below */ | |
1235 | } else { | |
1236 | msleep(delay); | |
1237 | } | |
1238 | } | |
1239 | init3: | |
f2835219 AS |
1240 | hub->quiescing = 0; |
1241 | ||
1242 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1243 | if (status < 0) | |
1244 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1245 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1246 | queue_delayed_work(system_power_efficient_wq, |
1247 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1248 | |
1249 | /* Scan all ports that need attention */ | |
32a69589 | 1250 | kick_hub_wq(hub); |
8e4ceb38 AS |
1251 | |
1252 | /* Allow autosuspend if it was suppressed */ | |
1253 | if (type <= HUB_INIT3) | |
1254 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
1255 | } |
1256 | ||
8520f380 AS |
1257 | /* Implement the continuations for the delays above */ |
1258 | static void hub_init_func2(struct work_struct *ws) | |
1259 | { | |
1260 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1261 | ||
1262 | hub_activate(hub, HUB_INIT2); | |
1263 | } | |
1264 | ||
1265 | static void hub_init_func3(struct work_struct *ws) | |
1266 | { | |
1267 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1268 | ||
1269 | hub_activate(hub, HUB_INIT3); | |
1270 | } | |
1271 | ||
4330354f AS |
1272 | enum hub_quiescing_type { |
1273 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1274 | }; | |
1275 | ||
1276 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1277 | { | |
1278 | struct usb_device *hdev = hub->hdev; | |
1279 | int i; | |
1280 | ||
8520f380 AS |
1281 | cancel_delayed_work_sync(&hub->init_work); |
1282 | ||
4330354f AS |
1283 | /* khubd and related activity won't re-trigger */ |
1284 | hub->quiescing = 1; | |
1285 | ||
1286 | if (type != HUB_SUSPEND) { | |
1287 | /* Disconnect all the children */ | |
1288 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1289 | if (hub->ports[i]->child) |
1290 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1291 | } |
1292 | } | |
1293 | ||
1294 | /* Stop khubd and related activity */ | |
1295 | usb_kill_urb(hub->urb); | |
1296 | if (hub->has_indicators) | |
1297 | cancel_delayed_work_sync(&hub->leds); | |
1298 | if (hub->tt.hub) | |
036546bf | 1299 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1300 | } |
1301 | ||
600856c2 AS |
1302 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
1303 | { | |
1304 | int i; | |
1305 | ||
1306 | for (i = 0; i < hub->hdev->maxchild; ++i) | |
1307 | pm_runtime_barrier(&hub->ports[i]->dev); | |
1308 | } | |
1309 | ||
3eb14915 AS |
1310 | /* caller has locked the hub device */ |
1311 | static int hub_pre_reset(struct usb_interface *intf) | |
1312 | { | |
1313 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1314 | ||
4330354f | 1315 | hub_quiesce(hub, HUB_PRE_RESET); |
600856c2 AS |
1316 | hub->in_reset = 1; |
1317 | hub_pm_barrier_for_all_ports(hub); | |
f07600cf | 1318 | return 0; |
7d069b7d AS |
1319 | } |
1320 | ||
1321 | /* caller has locked the hub device */ | |
f07600cf | 1322 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1323 | { |
7de18d8b AS |
1324 | struct usb_hub *hub = usb_get_intfdata(intf); |
1325 | ||
600856c2 AS |
1326 | hub->in_reset = 0; |
1327 | hub_pm_barrier_for_all_ports(hub); | |
f2835219 | 1328 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1329 | return 0; |
7d069b7d AS |
1330 | } |
1331 | ||
1da177e4 LT |
1332 | static int hub_configure(struct usb_hub *hub, |
1333 | struct usb_endpoint_descriptor *endpoint) | |
1334 | { | |
b356b7c7 | 1335 | struct usb_hcd *hcd; |
1da177e4 LT |
1336 | struct usb_device *hdev = hub->hdev; |
1337 | struct device *hub_dev = hub->intfdev; | |
1338 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1339 | u16 wHubCharacteristics; |
1da177e4 | 1340 | unsigned int pipe; |
fa2a9566 | 1341 | int maxp, ret, i; |
7cbe5dca | 1342 | char *message = "out of memory"; |
430ee58e SAS |
1343 | unsigned unit_load; |
1344 | unsigned full_load; | |
d8521afe | 1345 | unsigned maxchild; |
1da177e4 | 1346 | |
d697cdda | 1347 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1348 | if (!hub->buffer) { |
1da177e4 LT |
1349 | ret = -ENOMEM; |
1350 | goto fail; | |
1351 | } | |
1352 | ||
1353 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1354 | if (!hub->status) { | |
1da177e4 LT |
1355 | ret = -ENOMEM; |
1356 | goto fail; | |
1357 | } | |
db90e7a1 | 1358 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
1359 | |
1360 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
1361 | if (!hub->descriptor) { | |
1da177e4 LT |
1362 | ret = -ENOMEM; |
1363 | goto fail; | |
1364 | } | |
1365 | ||
1366 | /* Request the entire hub descriptor. | |
1367 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
1368 | * but the hub can/will return fewer bytes here. | |
1369 | */ | |
dbe79bbe | 1370 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1371 | if (ret < 0) { |
1372 | message = "can't read hub descriptor"; | |
1373 | goto fail; | |
1374 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1375 | message = "hub has too many ports!"; | |
1376 | ret = -ENODEV; | |
1377 | goto fail; | |
769d7368 DL |
1378 | } else if (hub->descriptor->bNbrPorts == 0) { |
1379 | message = "hub doesn't have any ports!"; | |
1380 | ret = -ENODEV; | |
1381 | goto fail; | |
1da177e4 LT |
1382 | } |
1383 | ||
d8521afe DW |
1384 | maxchild = hub->descriptor->bNbrPorts; |
1385 | dev_info(hub_dev, "%d port%s detected\n", maxchild, | |
1386 | (maxchild == 1) ? "" : "s"); | |
1da177e4 | 1387 | |
d8521afe | 1388 | hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
ff823c79 | 1389 | if (!hub->ports) { |
7cbe5dca AS |
1390 | ret = -ENOMEM; |
1391 | goto fail; | |
1392 | } | |
1393 | ||
74ad9bd2 | 1394 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1395 | if (hub_is_superspeed(hdev)) { |
1396 | unit_load = 150; | |
1397 | full_load = 900; | |
1398 | } else { | |
1399 | unit_load = 100; | |
1400 | full_load = 500; | |
1401 | } | |
1da177e4 | 1402 | |
dbe79bbe JY |
1403 | /* FIXME for USB 3.0, skip for now */ |
1404 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1405 | !(hub_is_superspeed(hdev))) { | |
1da177e4 | 1406 | int i; |
469271f8 | 1407 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 | 1408 | |
d8521afe | 1409 | for (i = 0; i < maxchild; i++) |
dbe79bbe | 1410 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1411 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1412 | ? 'F' : 'R'; | |
d8521afe | 1413 | portstr[maxchild] = 0; |
1da177e4 LT |
1414 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
1415 | } else | |
1416 | dev_dbg(hub_dev, "standalone hub\n"); | |
1417 | ||
74ad9bd2 | 1418 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1419 | case HUB_CHAR_COMMON_LPSM: |
1420 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1421 | break; | |
1422 | case HUB_CHAR_INDV_PORT_LPSM: | |
1423 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1424 | break; | |
1425 | case HUB_CHAR_NO_LPSM: | |
1426 | case HUB_CHAR_LPSM: | |
1427 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1428 | break; | |
1da177e4 LT |
1429 | } |
1430 | ||
74ad9bd2 | 1431 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1432 | case HUB_CHAR_COMMON_OCPM: |
1433 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1434 | break; | |
1435 | case HUB_CHAR_INDV_PORT_OCPM: | |
1436 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1437 | break; | |
1438 | case HUB_CHAR_NO_OCPM: | |
1439 | case HUB_CHAR_OCPM: | |
1440 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1441 | break; | |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | spin_lock_init (&hub->tt.lock); | |
1445 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1446 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1447 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1448 | case USB_HUB_PR_FS: |
1449 | break; | |
1450 | case USB_HUB_PR_HS_SINGLE_TT: | |
1451 | dev_dbg(hub_dev, "Single TT\n"); | |
1452 | hub->tt.hub = hdev; | |
1453 | break; | |
1454 | case USB_HUB_PR_HS_MULTI_TT: | |
1455 | ret = usb_set_interface(hdev, 0, 1); | |
1456 | if (ret == 0) { | |
1457 | dev_dbg(hub_dev, "TT per port\n"); | |
1458 | hub->tt.multi = 1; | |
1459 | } else | |
1460 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1461 | ret); | |
1462 | hub->tt.hub = hdev; | |
1463 | break; | |
1464 | case USB_HUB_PR_SS: | |
1465 | /* USB 3.0 hubs don't have a TT */ | |
1466 | break; | |
1467 | default: | |
1468 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1469 | hdev->descriptor.bDeviceProtocol); | |
1470 | break; | |
1da177e4 LT |
1471 | } |
1472 | ||
e09711ae | 1473 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1474 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1475 | case HUB_TTTT_8_BITS: |
1476 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1477 | hub->tt.think_time = 666; | |
e09711ae | 1478 | dev_dbg(hub_dev, "TT requires at most %d " |
1479 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1480 | 8, hub->tt.think_time); |
1481 | } | |
1482 | break; | |
1483 | case HUB_TTTT_16_BITS: | |
1484 | hub->tt.think_time = 666 * 2; | |
1485 | dev_dbg(hub_dev, "TT requires at most %d " | |
1486 | "FS bit times (%d ns)\n", | |
1487 | 16, hub->tt.think_time); | |
1488 | break; | |
1489 | case HUB_TTTT_24_BITS: | |
1490 | hub->tt.think_time = 666 * 3; | |
1491 | dev_dbg(hub_dev, "TT requires at most %d " | |
1492 | "FS bit times (%d ns)\n", | |
1493 | 24, hub->tt.think_time); | |
1494 | break; | |
1495 | case HUB_TTTT_32_BITS: | |
1496 | hub->tt.think_time = 666 * 4; | |
1497 | dev_dbg(hub_dev, "TT requires at most %d " | |
1498 | "FS bit times (%d ns)\n", | |
1499 | 32, hub->tt.think_time); | |
1500 | break; | |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1504 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1505 | hub->has_indicators = 1; |
1506 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1507 | } | |
1508 | ||
1509 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1510 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1511 | ||
1512 | /* power budgeting mostly matters with bus-powered hubs, | |
1513 | * and battery-powered root hubs (may provide just 8 mA). | |
1514 | */ | |
1515 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
15b7336e | 1516 | if (ret) { |
1da177e4 LT |
1517 | message = "can't get hub status"; |
1518 | goto fail; | |
1519 | } | |
430ee58e | 1520 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1521 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1522 | if (hcd->power_budget > 0) |
1523 | hdev->bus_mA = hcd->power_budget; | |
1524 | else | |
d8521afe | 1525 | hdev->bus_mA = full_load * maxchild; |
430ee58e SAS |
1526 | if (hdev->bus_mA >= full_load) |
1527 | hub->mA_per_port = full_load; | |
55c52718 AS |
1528 | else { |
1529 | hub->mA_per_port = hdev->bus_mA; | |
1530 | hub->limited_power = 1; | |
1531 | } | |
7d35b929 | 1532 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1533 | int remaining = hdev->bus_mA - |
1534 | hub->descriptor->bHubContrCurrent; | |
1535 | ||
1da177e4 LT |
1536 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1537 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1538 | hub->limited_power = 1; |
55c52718 | 1539 | |
d8521afe | 1540 | if (remaining < maxchild * unit_load) |
430ee58e | 1541 | dev_warn(hub_dev, |
55c52718 AS |
1542 | "insufficient power available " |
1543 | "to use all downstream ports\n"); | |
430ee58e SAS |
1544 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1545 | ||
55c52718 AS |
1546 | } else { /* Self-powered external hub */ |
1547 | /* FIXME: What about battery-powered external hubs that | |
1548 | * provide less current per port? */ | |
430ee58e | 1549 | hub->mA_per_port = full_load; |
7d35b929 | 1550 | } |
430ee58e | 1551 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1552 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1553 | hub->mA_per_port); | |
1da177e4 LT |
1554 | |
1555 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1556 | if (ret < 0) { | |
1557 | message = "can't get hub status"; | |
1558 | goto fail; | |
1559 | } | |
1560 | ||
1561 | /* local power status reports aren't always correct */ | |
1562 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1563 | dev_dbg(hub_dev, "local power source is %s\n", | |
1564 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1565 | ? "lost (inactive)" : "good"); | |
1566 | ||
74ad9bd2 | 1567 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1568 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1569 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1570 | ||
88fafff9 | 1571 | /* set up the interrupt endpoint |
1572 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1573 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1574 | * to send more data (and thus cause overflow). For root hubs, | |
1575 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1576 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1577 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1578 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1579 | ||
1580 | if (maxp > sizeof(*hub->buffer)) | |
1581 | maxp = sizeof(*hub->buffer); | |
1582 | ||
1583 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1584 | if (!hub->urb) { | |
1da177e4 LT |
1585 | ret = -ENOMEM; |
1586 | goto fail; | |
1587 | } | |
1588 | ||
1589 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1590 | hub, endpoint->bInterval); | |
1da177e4 LT |
1591 | |
1592 | /* maybe cycle the hub leds */ | |
1593 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1594 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1595 | |
d8521afe DW |
1596 | mutex_lock(&usb_port_peer_mutex); |
1597 | for (i = 0; i < maxchild; i++) { | |
e58547eb KM |
1598 | ret = usb_hub_create_port_device(hub, i + 1); |
1599 | if (ret < 0) { | |
fa2a9566 LT |
1600 | dev_err(hub->intfdev, |
1601 | "couldn't create port%d device.\n", i + 1); | |
d8521afe | 1602 | break; |
e58547eb KM |
1603 | } |
1604 | } | |
d8521afe | 1605 | hdev->maxchild = i; |
e3d10505 DW |
1606 | for (i = 0; i < hdev->maxchild; i++) { |
1607 | struct usb_port *port_dev = hub->ports[i]; | |
1608 | ||
1609 | pm_runtime_put(&port_dev->dev); | |
1610 | } | |
1611 | ||
d8521afe DW |
1612 | mutex_unlock(&usb_port_peer_mutex); |
1613 | if (ret < 0) | |
1614 | goto fail; | |
fa2a9566 | 1615 | |
e3d95580 DW |
1616 | /* Update the HCD's internal representation of this hub before khubd |
1617 | * starts getting port status changes for devices under the hub. | |
1618 | */ | |
1619 | if (hcd->driver->update_hub_device) { | |
1620 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1621 | &hub->tt, GFP_KERNEL); | |
1622 | if (ret < 0) { | |
1623 | message = "can't update HCD hub info"; | |
1624 | goto fail; | |
1625 | } | |
1626 | } | |
1627 | ||
d2123fd9 LT |
1628 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1629 | ||
f2835219 | 1630 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1631 | return 0; |
1632 | ||
1633 | fail: | |
1634 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1635 | message, ret); | |
1636 | /* hub_disconnect() frees urb and descriptor */ | |
1637 | return ret; | |
1638 | } | |
1639 | ||
e8054854 AS |
1640 | static void hub_release(struct kref *kref) |
1641 | { | |
1642 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1643 | ||
5d14f323 | 1644 | usb_put_dev(hub->hdev); |
e8054854 AS |
1645 | usb_put_intf(to_usb_interface(hub->intfdev)); |
1646 | kfree(hub); | |
1647 | } | |
1648 | ||
1da177e4 LT |
1649 | static unsigned highspeed_hubs; |
1650 | ||
1651 | static void hub_disconnect(struct usb_interface *intf) | |
1652 | { | |
8816230e | 1653 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1654 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1655 | int port1; |
fa2a9566 | 1656 | |
32a69589 PM |
1657 | /* |
1658 | * Stop adding new hub events. We do not want to block here and thus | |
1659 | * will not try to remove any pending work item. | |
1660 | */ | |
e8054854 | 1661 | hub->disconnected = 1; |
1da177e4 | 1662 | |
7de18d8b AS |
1663 | /* Disconnect all children and quiesce the hub */ |
1664 | hub->error = 0; | |
4330354f | 1665 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1666 | |
d8521afe DW |
1667 | mutex_lock(&usb_port_peer_mutex); |
1668 | ||
543d7784 AS |
1669 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1670 | spin_lock_irq(&device_state_lock); | |
1671 | port1 = hdev->maxchild; | |
1672 | hdev->maxchild = 0; | |
1673 | usb_set_intfdata(intf, NULL); | |
1674 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1675 | |
543d7784 AS |
1676 | for (; port1 > 0; --port1) |
1677 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1678 | |
d8521afe DW |
1679 | mutex_unlock(&usb_port_peer_mutex); |
1680 | ||
e8054854 | 1681 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1682 | highspeed_hubs--; |
1683 | ||
1da177e4 | 1684 | usb_free_urb(hub->urb); |
fa2a9566 | 1685 | kfree(hub->ports); |
1bc3c9e1 | 1686 | kfree(hub->descriptor); |
1bc3c9e1 | 1687 | kfree(hub->status); |
d697cdda | 1688 | kfree(hub->buffer); |
1da177e4 | 1689 | |
971fcd49 | 1690 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1691 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1692 | } |
1693 | ||
1694 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1695 | { | |
1696 | struct usb_host_interface *desc; | |
1697 | struct usb_endpoint_descriptor *endpoint; | |
1698 | struct usb_device *hdev; | |
1699 | struct usb_hub *hub; | |
1700 | ||
1701 | desc = intf->cur_altsetting; | |
1702 | hdev = interface_to_usbdev(intf); | |
1703 | ||
596d789a ML |
1704 | /* |
1705 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1706 | * based on the below considerations: | |
1707 | * | |
1708 | * - Unlike other drivers, the hub driver does not rely on the | |
1709 | * autosuspend delay to provide enough time to handle a wakeup | |
1710 | * event, and the submitted status URB is just to check future | |
1711 | * change on hub downstream ports, so it is safe to do it. | |
1712 | * | |
1713 | * - The patch might cause one or more auto supend/resume for | |
1714 | * below very rare devices when they are plugged into hub | |
1715 | * first time: | |
1716 | * | |
1717 | * devices having trouble initializing, and disconnect | |
1718 | * themselves from the bus and then reconnect a second | |
1719 | * or so later | |
1720 | * | |
1721 | * devices just for downloading firmware, and disconnects | |
1722 | * themselves after completing it | |
1723 | * | |
1724 | * For these quite rare devices, their drivers may change the | |
1725 | * autosuspend delay of their parent hub in the probe() to one | |
1726 | * appropriate value to avoid the subtle problem if someone | |
1727 | * does care it. | |
1728 | * | |
1729 | * - The patch may cause one or more auto suspend/resume on | |
1730 | * hub during running 'lsusb', but it is probably too | |
1731 | * infrequent to worry about. | |
1732 | * | |
1733 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1734 | * suspend timer for hub, also may decrease power consumption | |
1735 | * of USB bus. | |
bdd405d2 RQ |
1736 | * |
1737 | * - If user has indicated to prevent autosuspend by passing | |
1738 | * usbcore.autosuspend = -1 then keep autosuspend disabled. | |
596d789a | 1739 | */ |
a9ef803d | 1740 | #ifdef CONFIG_PM_RUNTIME |
bdd405d2 RQ |
1741 | if (hdev->dev.power.autosuspend_delay >= 0) |
1742 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
a9ef803d | 1743 | #endif |
596d789a | 1744 | |
8ef42ddd AS |
1745 | /* |
1746 | * Hubs have proper suspend/resume support, except for root hubs | |
1747 | * where the controller driver doesn't have bus_suspend and | |
1748 | * bus_resume methods. | |
1749 | */ | |
1750 | if (hdev->parent) { /* normal device */ | |
1751 | usb_enable_autosuspend(hdev); | |
1752 | } else { /* root hub */ | |
1753 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; | |
1754 | ||
1755 | if (drv->bus_suspend && drv->bus_resume) | |
1756 | usb_enable_autosuspend(hdev); | |
1757 | } | |
088f7fec | 1758 | |
38f3ad5e | 1759 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1760 | dev_err(&intf->dev, |
1761 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1762 | return -E2BIG; |
1763 | } | |
1764 | ||
89ccbdc9 DB |
1765 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1766 | if (hdev->parent) { | |
1767 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1768 | return -ENODEV; | |
1769 | } | |
1770 | #endif | |
1771 | ||
1da177e4 LT |
1772 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1773 | /* specs is not defined, but it works */ | |
1774 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1775 | (desc->desc.bInterfaceSubClass != 1)) { | |
1776 | descriptor_error: | |
1777 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1778 | return -EIO; | |
1779 | } | |
1780 | ||
1781 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1782 | if (desc->desc.bNumEndpoints != 1) | |
1783 | goto descriptor_error; | |
1784 | ||
1785 | endpoint = &desc->endpoint[0].desc; | |
1786 | ||
fbf81c29 LFC |
1787 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1788 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1789 | goto descriptor_error; |
1790 | ||
1791 | /* We found a hub */ | |
1792 | dev_info (&intf->dev, "USB hub found\n"); | |
1793 | ||
0a1ef3b5 | 1794 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1795 | if (!hub) { |
1796 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1797 | return -ENOMEM; | |
1798 | } | |
1799 | ||
e8054854 | 1800 | kref_init(&hub->kref); |
1da177e4 LT |
1801 | hub->intfdev = &intf->dev; |
1802 | hub->hdev = hdev; | |
c4028958 | 1803 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1804 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
32a69589 | 1805 | INIT_WORK(&hub->events, hub_event); |
e8054854 | 1806 | usb_get_intf(intf); |
5d14f323 | 1807 | usb_get_dev(hdev); |
1da177e4 LT |
1808 | |
1809 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1810 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1811 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1812 | |
1813 | if (hdev->speed == USB_SPEED_HIGH) | |
1814 | highspeed_hubs++; | |
1815 | ||
e6f30dea ML |
1816 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1817 | hub->quirk_check_port_auto_suspend = 1; | |
1818 | ||
1da177e4 LT |
1819 | if (hub_configure(hub, endpoint) >= 0) |
1820 | return 0; | |
1821 | ||
1822 | hub_disconnect (intf); | |
1823 | return -ENODEV; | |
1824 | } | |
1825 | ||
1826 | static int | |
1827 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1828 | { | |
1829 | struct usb_device *hdev = interface_to_usbdev (intf); | |
ad493e5e | 1830 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1831 | |
1832 | /* assert ifno == 0 (part of hub spec) */ | |
1833 | switch (code) { | |
1834 | case USBDEVFS_HUB_PORTINFO: { | |
1835 | struct usbdevfs_hub_portinfo *info = user_data; | |
1836 | int i; | |
1837 | ||
1838 | spin_lock_irq(&device_state_lock); | |
1839 | if (hdev->devnum <= 0) | |
1840 | info->nports = 0; | |
1841 | else { | |
1842 | info->nports = hdev->maxchild; | |
1843 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1844 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1845 | info->port[i] = 0; |
1846 | else | |
1847 | info->port[i] = | |
ff823c79 | 1848 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1849 | } |
1850 | } | |
1851 | spin_unlock_irq(&device_state_lock); | |
1852 | ||
1853 | return info->nports + 1; | |
1854 | } | |
1855 | ||
1856 | default: | |
1857 | return -ENOSYS; | |
1858 | } | |
1859 | } | |
1860 | ||
7cbe5dca AS |
1861 | /* |
1862 | * Allow user programs to claim ports on a hub. When a device is attached | |
1863 | * to one of these "claimed" ports, the program will "own" the device. | |
1864 | */ | |
1865 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 1866 | struct usb_dev_state ***ppowner) |
7cbe5dca | 1867 | { |
41341261 MN |
1868 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1869 | ||
7cbe5dca AS |
1870 | if (hdev->state == USB_STATE_NOTATTACHED) |
1871 | return -ENODEV; | |
1872 | if (port1 == 0 || port1 > hdev->maxchild) | |
1873 | return -EINVAL; | |
1874 | ||
41341261 | 1875 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1876 | * will always have maxchild equal to 0. |
1877 | */ | |
41341261 | 1878 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1879 | return 0; |
1880 | } | |
1881 | ||
1882 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 | 1883 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1884 | struct usb_dev_state *owner) |
7cbe5dca AS |
1885 | { |
1886 | int rc; | |
9b6f0c4b | 1887 | struct usb_dev_state **powner; |
7cbe5dca AS |
1888 | |
1889 | rc = find_port_owner(hdev, port1, &powner); | |
1890 | if (rc) | |
1891 | return rc; | |
1892 | if (*powner) | |
1893 | return -EBUSY; | |
1894 | *powner = owner; | |
1895 | return rc; | |
1896 | } | |
6080cd0e | 1897 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
7cbe5dca | 1898 | |
336c5c31 | 1899 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1900 | struct usb_dev_state *owner) |
7cbe5dca AS |
1901 | { |
1902 | int rc; | |
9b6f0c4b | 1903 | struct usb_dev_state **powner; |
7cbe5dca AS |
1904 | |
1905 | rc = find_port_owner(hdev, port1, &powner); | |
1906 | if (rc) | |
1907 | return rc; | |
1908 | if (*powner != owner) | |
1909 | return -ENOENT; | |
1910 | *powner = NULL; | |
1911 | return rc; | |
1912 | } | |
6080cd0e | 1913 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
7cbe5dca | 1914 | |
9b6f0c4b | 1915 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
7cbe5dca | 1916 | { |
ad493e5e | 1917 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1918 | int n; |
7cbe5dca | 1919 | |
fa2a9566 LT |
1920 | for (n = 0; n < hdev->maxchild; n++) { |
1921 | if (hub->ports[n]->port_owner == owner) | |
1922 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1923 | } |
fa2a9566 | 1924 | |
7cbe5dca AS |
1925 | } |
1926 | ||
1927 | /* The caller must hold udev's lock */ | |
1928 | bool usb_device_is_owned(struct usb_device *udev) | |
1929 | { | |
1930 | struct usb_hub *hub; | |
1931 | ||
1932 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1933 | return false; | |
ad493e5e | 1934 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1935 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1936 | } |
1937 | ||
1da177e4 LT |
1938 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1939 | { | |
ad493e5e | 1940 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1941 | int i; |
1942 | ||
1943 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1944 | if (hub->ports[i]->child) |
1945 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1946 | } |
9bbdf1e0 | 1947 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1948 | udev->active_duration -= jiffies; |
1da177e4 LT |
1949 | udev->state = USB_STATE_NOTATTACHED; |
1950 | } | |
1951 | ||
1952 | /** | |
1953 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1954 | * @udev: pointer to device whose state should be changed | |
1955 | * @new_state: new state value to be stored | |
1956 | * | |
1957 | * udev->state is _not_ fully protected by the device lock. Although | |
1958 | * most transitions are made only while holding the lock, the state can | |
1959 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1960 | * is so that devices can be marked as disconnected as soon as possible, | |
1961 | * without having to wait for any semaphores to be released. As a result, | |
1962 | * all changes to any device's state must be protected by the | |
1963 | * device_state_lock spinlock. | |
1964 | * | |
1965 | * Once a device has been added to the device tree, all changes to its state | |
1966 | * should be made using this routine. The state should _not_ be set directly. | |
1967 | * | |
1968 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1969 | * Otherwise udev->state is set to new_state, and if new_state is | |
1970 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1971 | * to USB_STATE_NOTATTACHED. | |
1972 | */ | |
1973 | void usb_set_device_state(struct usb_device *udev, | |
1974 | enum usb_device_state new_state) | |
1975 | { | |
1976 | unsigned long flags; | |
4681b171 | 1977 | int wakeup = -1; |
1da177e4 LT |
1978 | |
1979 | spin_lock_irqsave(&device_state_lock, flags); | |
1980 | if (udev->state == USB_STATE_NOTATTACHED) | |
1981 | ; /* do nothing */ | |
b94dc6b5 | 1982 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1983 | |
1984 | /* root hub wakeup capabilities are managed out-of-band | |
1985 | * and may involve silicon errata ... ignore them here. | |
1986 | */ | |
1987 | if (udev->parent) { | |
645daaab AS |
1988 | if (udev->state == USB_STATE_SUSPENDED |
1989 | || new_state == USB_STATE_SUSPENDED) | |
1990 | ; /* No change to wakeup settings */ | |
1991 | else if (new_state == USB_STATE_CONFIGURED) | |
ddbe1fca LB |
1992 | wakeup = (udev->quirks & |
1993 | USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : | |
1994 | udev->actconfig->desc.bmAttributes & | |
1995 | USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1996 | else |
4681b171 | 1997 | wakeup = 0; |
fb669cc0 | 1998 | } |
15123006 SS |
1999 | if (udev->state == USB_STATE_SUSPENDED && |
2000 | new_state != USB_STATE_SUSPENDED) | |
2001 | udev->active_duration -= jiffies; | |
2002 | else if (new_state == USB_STATE_SUSPENDED && | |
2003 | udev->state != USB_STATE_SUSPENDED) | |
2004 | udev->active_duration += jiffies; | |
645daaab | 2005 | udev->state = new_state; |
b94dc6b5 | 2006 | } else |
1da177e4 LT |
2007 | recursively_mark_NOTATTACHED(udev); |
2008 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
2009 | if (wakeup >= 0) |
2010 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 2011 | } |
6da9c990 | 2012 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 2013 | |
8af548dc | 2014 | /* |
3b29b68b AS |
2015 | * Choose a device number. |
2016 | * | |
2017 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
2018 | * USB-2.0 buses they are also used as device addresses, however on | |
2019 | * USB-3.0 buses the address is assigned by the controller hardware | |
2020 | * and it usually is not the same as the device number. | |
2021 | * | |
8af548dc IPG |
2022 | * WUSB devices are simple: they have no hubs behind, so the mapping |
2023 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
2024 | * life of the device connection logic in | |
2025 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
2026 | * handshake we need to assign a temporary address in the unauthorized | |
2027 | * space. For simplicity we use the first virtual port number found to | |
2028 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
2029 | * and that becomes it's address [X < 128] or its unauthorized address | |
2030 | * [X | 0x80]. | |
2031 | * | |
2032 | * We add 1 as an offset to the one-based USB-stack port number | |
2033 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
2034 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
2035 | * uses always #1 for the root hub of the controller. So USB stack's | |
2036 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
2037 | * |
2038 | * Devices connected under xHCI are not as simple. The host controller | |
2039 | * supports virtualization, so the hardware assigns device addresses and | |
2040 | * the HCD must setup data structures before issuing a set address | |
2041 | * command to the hardware. | |
8af548dc | 2042 | */ |
3b29b68b | 2043 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
2044 | { |
2045 | int devnum; | |
2046 | struct usb_bus *bus = udev->bus; | |
2047 | ||
2048 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
2049 | if (udev->wusb) { |
2050 | devnum = udev->portnum + 1; | |
2051 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
2052 | } else { | |
2053 | /* Try to allocate the next devnum beginning at | |
2054 | * bus->devnum_next. */ | |
2055 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
2056 | bus->devnum_next); | |
2057 | if (devnum >= 128) | |
2058 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
2059 | 128, 1); | |
469271f8 | 2060 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 2061 | } |
1da177e4 LT |
2062 | if (devnum < 128) { |
2063 | set_bit(devnum, bus->devmap.devicemap); | |
2064 | udev->devnum = devnum; | |
2065 | } | |
2066 | } | |
2067 | ||
3b29b68b | 2068 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2069 | { |
2070 | if (udev->devnum > 0) { | |
2071 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2072 | udev->devnum = -1; | |
2073 | } | |
2074 | } | |
2075 | ||
3b29b68b | 2076 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2077 | { |
2078 | /* The address for a WUSB device is managed by wusbcore. */ | |
2079 | if (!udev->wusb) | |
2080 | udev->devnum = devnum; | |
2081 | } | |
2082 | ||
f7410ced HX |
2083 | static void hub_free_dev(struct usb_device *udev) |
2084 | { | |
2085 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2086 | ||
2087 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2088 | if (hcd->driver->free_dev && udev->parent) | |
2089 | hcd->driver->free_dev(hcd, udev); | |
2090 | } | |
2091 | ||
7027df36 DW |
2092 | static void hub_disconnect_children(struct usb_device *udev) |
2093 | { | |
2094 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2095 | int i; | |
2096 | ||
2097 | /* Free up all the children before we remove this device */ | |
2098 | for (i = 0; i < udev->maxchild; i++) { | |
2099 | if (hub->ports[i]->child) | |
2100 | usb_disconnect(&hub->ports[i]->child); | |
2101 | } | |
2102 | } | |
2103 | ||
1da177e4 LT |
2104 | /** |
2105 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2106 | * @pdev: pointer to device being disconnected | |
2107 | * Context: !in_interrupt () | |
2108 | * | |
2109 | * Something got disconnected. Get rid of it and all of its children. | |
2110 | * | |
2111 | * If *pdev is a normal device then the parent hub must already be locked. | |
db8f2aa3 BH |
2112 | * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, |
2113 | * which protects the set of root hubs as well as the list of buses. | |
1da177e4 LT |
2114 | * |
2115 | * Only hub drivers (including virtual root hub drivers for host | |
2116 | * controllers) should ever call this. | |
2117 | * | |
2118 | * This call is synchronous, and may not be used in an interrupt context. | |
2119 | */ | |
2120 | void usb_disconnect(struct usb_device **pdev) | |
2121 | { | |
7027df36 DW |
2122 | struct usb_port *port_dev = NULL; |
2123 | struct usb_device *udev = *pdev; | |
5b1dc209 PC |
2124 | struct usb_hub *hub = NULL; |
2125 | int port1 = 1; | |
1da177e4 | 2126 | |
1da177e4 LT |
2127 | /* mark the device as inactive, so any further urb submissions for |
2128 | * this device (and any of its children) will fail immediately. | |
25985edc | 2129 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2130 | */ |
2131 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2132 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2133 | udev->devnum); | |
1da177e4 | 2134 | |
9ad3d6cc AS |
2135 | usb_lock_device(udev); |
2136 | ||
7027df36 | 2137 | hub_disconnect_children(udev); |
1da177e4 LT |
2138 | |
2139 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2140 | * cleaning up all state associated with the current configuration | |
2141 | * so that the hardware is now fully quiesced. | |
2142 | */ | |
782da727 | 2143 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 2144 | usb_disable_device(udev, 0); |
cde217a5 | 2145 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2146 | |
fde26380 | 2147 | if (udev->parent) { |
7027df36 DW |
2148 | port1 = udev->portnum; |
2149 | hub = usb_hub_to_struct_hub(udev->parent); | |
2150 | port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2151 | |
2152 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2153 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2154 | |
7027df36 DW |
2155 | /* |
2156 | * As usb_port_runtime_resume() de-references udev, make | |
2157 | * sure no resumes occur during removal | |
2158 | */ | |
2159 | if (!test_and_set_bit(port1, hub->child_usage_bits)) | |
2160 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2161 | } |
2162 | ||
3b23dd6f | 2163 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2164 | usb_unlock_device(udev); |
2165 | ||
2166 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2167 | * for de-configuring the device and invoking the remove-device |
2168 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2169 | */ |
2170 | device_del(&udev->dev); | |
3099e75a | 2171 | |
782da727 | 2172 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2173 | * (or root_hub) pointer. |
2174 | */ | |
3b29b68b | 2175 | release_devnum(udev); |
1da177e4 LT |
2176 | |
2177 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2178 | spin_lock_irq(&device_state_lock); | |
2179 | *pdev = NULL; | |
2180 | spin_unlock_irq(&device_state_lock); | |
2181 | ||
7027df36 DW |
2182 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
2183 | pm_runtime_put(&port_dev->dev); | |
2184 | ||
f7410ced HX |
2185 | hub_free_dev(udev); |
2186 | ||
782da727 | 2187 | put_device(&udev->dev); |
1da177e4 LT |
2188 | } |
2189 | ||
f2a383e4 | 2190 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2191 | static void show_string(struct usb_device *udev, char *id, char *string) |
2192 | { | |
2193 | if (!string) | |
2194 | return; | |
f2ec522e | 2195 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2196 | } |
2197 | ||
f2a383e4 GKH |
2198 | static void announce_device(struct usb_device *udev) |
2199 | { | |
2200 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2201 | le16_to_cpu(udev->descriptor.idVendor), | |
2202 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2203 | dev_info(&udev->dev, |
2204 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2205 | udev->descriptor.iManufacturer, |
2206 | udev->descriptor.iProduct, | |
2207 | udev->descriptor.iSerialNumber); | |
2208 | show_string(udev, "Product", udev->product); | |
2209 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2210 | show_string(udev, "SerialNumber", udev->serial); | |
2211 | } | |
1da177e4 | 2212 | #else |
f2a383e4 | 2213 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2214 | #endif |
2215 | ||
1da177e4 | 2216 | |
3ede760f | 2217 | /** |
8d8558d1 | 2218 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2219 | * @udev: newly addressed device (in ADDRESS state) |
2220 | * | |
8d8558d1 | 2221 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2222 | * |
2223 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2224 | */ |
8d8558d1 | 2225 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2226 | { |
d9d16e8a | 2227 | int err = 0; |
1da177e4 LT |
2228 | |
2229 | #ifdef CONFIG_USB_OTG | |
2230 | /* | |
2231 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2232 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2233 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2234 | */ | |
2235 | if (!udev->bus->is_b_host | |
2236 | && udev->config | |
2237 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2238 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
2239 | struct usb_bus *bus = udev->bus; |
2240 | ||
2241 | /* descriptor may appear anywhere in config */ | |
2242 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
2243 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2244 | USB_DT_OTG, (void **) &desc) == 0) { | |
2245 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 2246 | unsigned port1 = udev->portnum; |
fc849b85 | 2247 | |
1da177e4 LT |
2248 | dev_info(&udev->dev, |
2249 | "Dual-Role OTG device on %sHNP port\n", | |
2250 | (port1 == bus->otg_port) | |
2251 | ? "" : "non-"); | |
2252 | ||
2253 | /* enable HNP before suspend, it's simpler */ | |
2254 | if (port1 == bus->otg_port) | |
2255 | bus->b_hnp_enable = 1; | |
2256 | err = usb_control_msg(udev, | |
2257 | usb_sndctrlpipe(udev, 0), | |
2258 | USB_REQ_SET_FEATURE, 0, | |
2259 | bus->b_hnp_enable | |
2260 | ? USB_DEVICE_B_HNP_ENABLE | |
2261 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2262 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2263 | if (err < 0) { | |
2264 | /* OTG MESSAGE: report errors here, | |
2265 | * customize to match your product. | |
2266 | */ | |
2267 | dev_info(&udev->dev, | |
b9cef6c3 | 2268 | "can't set HNP mode: %d\n", |
1da177e4 LT |
2269 | err); |
2270 | bus->b_hnp_enable = 0; | |
2271 | } | |
2272 | } | |
2273 | } | |
2274 | } | |
1da177e4 | 2275 | #endif |
d9d16e8a IPG |
2276 | return err; |
2277 | } | |
2278 | ||
2279 | ||
2280 | /** | |
8d8558d1 | 2281 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2282 | * @udev: newly addressed device (in ADDRESS state) |
2283 | * | |
2284 | * This is only called by usb_new_device() and usb_authorize_device() | |
2285 | * and FIXME -- all comments that apply to them apply here wrt to | |
2286 | * environment. | |
2287 | * | |
2288 | * If the device is WUSB and not authorized, we don't attempt to read | |
2289 | * the string descriptors, as they will be errored out by the device | |
2290 | * until it has been authorized. | |
626f090c YB |
2291 | * |
2292 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2293 | */ |
8d8558d1 | 2294 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2295 | { |
2296 | int err; | |
026f3fcb | 2297 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2298 | |
d9d16e8a IPG |
2299 | if (udev->config == NULL) { |
2300 | err = usb_get_configuration(udev); | |
2301 | if (err < 0) { | |
e9e88fb7 AS |
2302 | if (err != -ENODEV) |
2303 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2304 | err); | |
80da2e0d | 2305 | return err; |
d9d16e8a IPG |
2306 | } |
2307 | } | |
83e83ecb TP |
2308 | |
2309 | /* read the standard strings and cache them if present */ | |
2310 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2311 | udev->manufacturer = usb_cache_string(udev, | |
2312 | udev->descriptor.iManufacturer); | |
2313 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2314 | ||
8d8558d1 | 2315 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2316 | if (err < 0) |
2317 | return err; | |
2318 | ||
026f3fcb PC |
2319 | if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && |
2320 | !is_targeted(udev) && IS_ENABLED(CONFIG_USB_OTG)) { | |
2321 | /* Maybe it can talk to us, though we can't talk to it. | |
2322 | * (Includes HNP test device.) | |
2323 | */ | |
2324 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
2325 | err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); | |
2326 | if (err < 0) | |
2327 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2328 | } | |
2329 | return -ENOTSUPP; | |
2330 | } | |
2331 | ||
80da2e0d LP |
2332 | usb_detect_interface_quirks(udev); |
2333 | ||
2334 | return 0; | |
d9d16e8a IPG |
2335 | } |
2336 | ||
d35e70d5 MG |
2337 | static void set_usb_port_removable(struct usb_device *udev) |
2338 | { | |
2339 | struct usb_device *hdev = udev->parent; | |
2340 | struct usb_hub *hub; | |
2341 | u8 port = udev->portnum; | |
2342 | u16 wHubCharacteristics; | |
2343 | bool removable = true; | |
2344 | ||
2345 | if (!hdev) | |
2346 | return; | |
2347 | ||
ad493e5e | 2348 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 MG |
2349 | |
2350 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
2351 | ||
2352 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2353 | return; | |
2354 | ||
2355 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2356 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2357 | & (1 << port)) | |
d35e70d5 MG |
2358 | removable = false; |
2359 | } else { | |
2360 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2361 | removable = false; | |
2362 | } | |
2363 | ||
2364 | if (removable) | |
2365 | udev->removable = USB_DEVICE_REMOVABLE; | |
2366 | else | |
2367 | udev->removable = USB_DEVICE_FIXED; | |
a4204ff0 DW |
2368 | |
2369 | /* | |
2370 | * Platform firmware may have populated an alternative value for | |
2371 | * removable. If the parent port has a known connect_type use | |
2372 | * that instead. | |
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 | break; | |
2378 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
2379 | udev->removable = USB_DEVICE_FIXED; | |
2380 | break; | |
2381 | default: /* use what was set above */ | |
2382 | break; | |
2383 | } | |
d35e70d5 | 2384 | } |
d9d16e8a IPG |
2385 | |
2386 | /** | |
2387 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2388 | * @udev: newly addressed device (in ADDRESS state) | |
2389 | * | |
8d8558d1 AS |
2390 | * This is called with devices which have been detected but not fully |
2391 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2392 | * for any device configuration. The caller must have locked either |
2393 | * the parent hub (if udev is a normal device) or else the | |
2394 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
2395 | * udev has already been installed, but udev is not yet visible through | |
2396 | * sysfs or other filesystem code. | |
2397 | * | |
d9d16e8a IPG |
2398 | * This call is synchronous, and may not be used in an interrupt context. |
2399 | * | |
2400 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2401 | * |
2402 | * Return: Whether the device is configured properly or not. Zero if the | |
2403 | * interface was registered with the driver core; else a negative errno | |
2404 | * value. | |
2405 | * | |
d9d16e8a IPG |
2406 | */ |
2407 | int usb_new_device(struct usb_device *udev) | |
2408 | { | |
2409 | int err; | |
2410 | ||
16985408 | 2411 | if (udev->parent) { |
16985408 DS |
2412 | /* Initialize non-root-hub device wakeup to disabled; |
2413 | * device (un)configuration controls wakeup capable | |
2414 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2415 | */ | |
2416 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2417 | } |
2418 | ||
9bbdf1e0 AS |
2419 | /* Tell the runtime-PM framework the device is active */ |
2420 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2421 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2422 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2423 | pm_runtime_enable(&udev->dev); |
2424 | ||
c08512c7 AS |
2425 | /* By default, forbid autosuspend for all devices. It will be |
2426 | * allowed for hubs during binding. | |
2427 | */ | |
2428 | usb_disable_autosuspend(udev); | |
2429 | ||
8d8558d1 | 2430 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2431 | if (err < 0) |
2432 | goto fail; | |
c6515272 SS |
2433 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2434 | udev->devnum, udev->bus->busnum, | |
2435 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2436 | /* export the usbdev device-node for libusb */ |
2437 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2438 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2439 | ||
6cd13201 AS |
2440 | /* Tell the world! */ |
2441 | announce_device(udev); | |
195af2cc | 2442 | |
b04b3156 TT |
2443 | if (udev->serial) |
2444 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2445 | if (udev->product) | |
2446 | add_device_randomness(udev->product, strlen(udev->product)); | |
2447 | if (udev->manufacturer) | |
2448 | add_device_randomness(udev->manufacturer, | |
2449 | strlen(udev->manufacturer)); | |
2450 | ||
927bc916 | 2451 | device_enable_async_suspend(&udev->dev); |
d35e70d5 | 2452 | |
a4204ff0 | 2453 | /* check whether the hub or firmware marks this port as non-removable */ |
d35e70d5 MG |
2454 | if (udev->parent) |
2455 | set_usb_port_removable(udev); | |
2456 | ||
782da727 | 2457 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2458 | * for configuring the device and invoking the add-device |
2459 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2460 | */ |
9f8b17e6 | 2461 | err = device_add(&udev->dev); |
1da177e4 LT |
2462 | if (err) { |
2463 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2464 | goto fail; | |
2465 | } | |
9ad3d6cc | 2466 | |
fde26380 LT |
2467 | /* Create link files between child device and usb port device. */ |
2468 | if (udev->parent) { | |
ad493e5e | 2469 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
d5c3834e DW |
2470 | int port1 = udev->portnum; |
2471 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2472 | |
2473 | err = sysfs_create_link(&udev->dev.kobj, | |
2474 | &port_dev->dev.kobj, "port"); | |
2475 | if (err) | |
2476 | goto fail; | |
2477 | ||
2478 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2479 | &udev->dev.kobj, "device"); | |
2480 | if (err) { | |
2481 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2482 | goto fail; | |
2483 | } | |
971fcd49 | 2484 | |
d5c3834e DW |
2485 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
2486 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2487 | } |
2488 | ||
3b23dd6f | 2489 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2490 | usb_mark_last_busy(udev); |
2491 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2492 | return err; |
1da177e4 LT |
2493 | |
2494 | fail: | |
2495 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2496 | pm_runtime_disable(&udev->dev); |
2497 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2498 | return err; |
1da177e4 LT |
2499 | } |
2500 | ||
93993a0a IPG |
2501 | |
2502 | /** | |
fd39c86b RD |
2503 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2504 | * @usb_dev: USB device | |
2505 | * | |
2506 | * Move the USB device to a very basic state where interfaces are disabled | |
2507 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2508 | * |
2509 | * We share a lock (that we have) with device_del(), so we need to | |
2510 | * defer its call. | |
626f090c YB |
2511 | * |
2512 | * Return: 0. | |
93993a0a IPG |
2513 | */ |
2514 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2515 | { | |
93993a0a IPG |
2516 | usb_lock_device(usb_dev); |
2517 | if (usb_dev->authorized == 0) | |
2518 | goto out_unauthorized; | |
da307123 | 2519 | |
93993a0a IPG |
2520 | usb_dev->authorized = 0; |
2521 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2522 | |
93993a0a IPG |
2523 | out_unauthorized: |
2524 | usb_unlock_device(usb_dev); | |
2525 | return 0; | |
2526 | } | |
2527 | ||
2528 | ||
2529 | int usb_authorize_device(struct usb_device *usb_dev) | |
2530 | { | |
2531 | int result = 0, c; | |
da307123 | 2532 | |
93993a0a IPG |
2533 | usb_lock_device(usb_dev); |
2534 | if (usb_dev->authorized == 1) | |
2535 | goto out_authorized; | |
da307123 | 2536 | |
93993a0a IPG |
2537 | result = usb_autoresume_device(usb_dev); |
2538 | if (result < 0) { | |
2539 | dev_err(&usb_dev->dev, | |
2540 | "can't autoresume for authorization: %d\n", result); | |
2541 | goto error_autoresume; | |
2542 | } | |
2543 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2544 | if (result < 0) { | |
2545 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2546 | "authorization: %d\n", result); | |
2547 | goto error_device_descriptor; | |
2548 | } | |
da307123 | 2549 | |
93993a0a | 2550 | usb_dev->authorized = 1; |
93993a0a IPG |
2551 | /* Choose and set the configuration. This registers the interfaces |
2552 | * with the driver core and lets interface drivers bind to them. | |
2553 | */ | |
b5ea060f | 2554 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2555 | if (c >= 0) { |
2556 | result = usb_set_configuration(usb_dev, c); | |
2557 | if (result) { | |
2558 | dev_err(&usb_dev->dev, | |
2559 | "can't set config #%d, error %d\n", c, result); | |
2560 | /* This need not be fatal. The user can try to | |
2561 | * set other configurations. */ | |
2562 | } | |
2563 | } | |
2564 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2565 | |
93993a0a | 2566 | error_device_descriptor: |
da307123 | 2567 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2568 | error_autoresume: |
2569 | out_authorized: | |
781b2137 | 2570 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2571 | return result; |
2572 | } | |
2573 | ||
2574 | ||
0165de09 IPG |
2575 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2576 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2577 | { | |
2578 | struct usb_hcd *hcd; | |
2579 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2580 | return 0; | |
2581 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
2582 | return hcd->wireless; | |
2583 | } | |
2584 | ||
2585 | ||
1da177e4 LT |
2586 | #define PORT_RESET_TRIES 5 |
2587 | #define SET_ADDRESS_TRIES 2 | |
2588 | #define GET_DESCRIPTOR_TRIES 2 | |
2589 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2590 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 LT |
2591 | |
2592 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2593 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2594 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2595 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2596 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2597 | |
48fc7dbd DW |
2598 | /* |
2599 | * "New scheme" enumeration causes an extra state transition to be | |
2600 | * exposed to an xhci host and causes USB3 devices to receive control | |
2601 | * commands in the default state. This has been seen to cause | |
2602 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2603 | * devices. | |
2604 | */ | |
2605 | static bool use_new_scheme(struct usb_device *udev, int retry) | |
2606 | { | |
2607 | if (udev->speed == USB_SPEED_SUPER) | |
2608 | return false; | |
2609 | ||
2610 | return USE_NEW_SCHEME(retry); | |
2611 | } | |
2612 | ||
10d674a8 SS |
2613 | static int hub_port_reset(struct usb_hub *hub, int port1, |
2614 | struct usb_device *udev, unsigned int delay, bool warm); | |
2615 | ||
025d4430 | 2616 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2617 | * Port worm reset is required to recover |
2618 | */ | |
3cd12f91 DW |
2619 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
2620 | u16 portstatus) | |
10d674a8 | 2621 | { |
3cd12f91 DW |
2622 | u16 link_state; |
2623 | ||
2624 | if (!hub_is_superspeed(hub->hdev)) | |
2625 | return false; | |
2626 | ||
2627 | if (test_bit(port1, hub->warm_reset_bits)) | |
2628 | return true; | |
2629 | ||
2630 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; | |
2631 | return link_state == USB_SS_PORT_LS_SS_INACTIVE | |
2632 | || link_state == USB_SS_PORT_LS_COMP_MOD; | |
10d674a8 SS |
2633 | } |
2634 | ||
1da177e4 | 2635 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2636 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2637 | { |
2638 | int delay_time, ret; | |
2639 | u16 portstatus; | |
2640 | u16 portchange; | |
2641 | ||
2642 | for (delay_time = 0; | |
2643 | delay_time < HUB_RESET_TIMEOUT; | |
2644 | delay_time += delay) { | |
2645 | /* wait to give the device a chance to reset */ | |
2646 | msleep(delay); | |
2647 | ||
2648 | /* read and decode port status */ | |
2649 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2650 | if (ret < 0) | |
2651 | return ret; | |
2652 | ||
4f43447e | 2653 | /* The port state is unknown until the reset completes. */ |
470f0be8 SS |
2654 | if (!(portstatus & USB_PORT_STAT_RESET)) |
2655 | break; | |
1da177e4 LT |
2656 | |
2657 | /* switch to the long delay after two short delay failures */ | |
2658 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2659 | delay = HUB_LONG_RESET_TIME; | |
2660 | ||
d99f6b41 DW |
2661 | dev_dbg(&hub->ports[port1 - 1]->dev, |
2662 | "not %sreset yet, waiting %dms\n", | |
2663 | warm ? "warm " : "", delay); | |
1da177e4 LT |
2664 | } |
2665 | ||
470f0be8 SS |
2666 | if ((portstatus & USB_PORT_STAT_RESET)) |
2667 | return -EBUSY; | |
2668 | ||
3cd12f91 | 2669 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
470f0be8 SS |
2670 | return -ENOTCONN; |
2671 | ||
2672 | /* Device went away? */ | |
2673 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2674 | return -ENOTCONN; | |
2675 | ||
2676 | /* bomb out completely if the connection bounced. A USB 3.0 | |
2677 | * connection may bounce if multiple warm resets were issued, | |
2678 | * but the device may have successfully re-connected. Ignore it. | |
2679 | */ | |
2680 | if (!hub_is_superspeed(hub->hdev) && | |
2681 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
2682 | return -ENOTCONN; | |
2683 | ||
2684 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2685 | return -EBUSY; | |
2686 | ||
2687 | if (!udev) | |
2688 | return 0; | |
2689 | ||
2690 | if (hub_is_wusb(hub)) | |
2691 | udev->speed = USB_SPEED_WIRELESS; | |
2692 | else if (hub_is_superspeed(hub->hdev)) | |
2693 | udev->speed = USB_SPEED_SUPER; | |
2694 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2695 | udev->speed = USB_SPEED_HIGH; | |
2696 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2697 | udev->speed = USB_SPEED_LOW; | |
2698 | else | |
2699 | udev->speed = USB_SPEED_FULL; | |
2700 | return 0; | |
1da177e4 LT |
2701 | } |
2702 | ||
75d7cf72 | 2703 | static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
a24a6078 | 2704 | struct usb_device *udev, int *status) |
75d7cf72 AX |
2705 | { |
2706 | switch (*status) { | |
2707 | case 0: | |
a24a6078 SS |
2708 | /* TRSTRCY = 10 ms; plus some extra */ |
2709 | msleep(10 + 40); | |
2710 | if (udev) { | |
2711 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2712 | ||
2713 | update_devnum(udev, 0); | |
2714 | /* The xHC may think the device is already reset, | |
2715 | * so ignore the status. | |
2716 | */ | |
2717 | if (hcd->driver->reset_device) | |
2718 | hcd->driver->reset_device(hcd, udev); | |
75d7cf72 AX |
2719 | } |
2720 | /* FALL THROUGH */ | |
2721 | case -ENOTCONN: | |
2722 | case -ENODEV: | |
ad493e5e | 2723 | usb_clear_port_feature(hub->hdev, |
75d7cf72 | 2724 | port1, USB_PORT_FEAT_C_RESET); |
1c7439c6 | 2725 | if (hub_is_superspeed(hub->hdev)) { |
ad493e5e | 2726 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2727 | USB_PORT_FEAT_C_BH_PORT_RESET); |
ad493e5e | 2728 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2729 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
ad493e5e | 2730 | usb_clear_port_feature(hub->hdev, port1, |
a24a6078 | 2731 | USB_PORT_FEAT_C_CONNECTION); |
1c7439c6 | 2732 | } |
a24a6078 | 2733 | if (udev) |
75d7cf72 AX |
2734 | usb_set_device_state(udev, *status |
2735 | ? USB_STATE_NOTATTACHED | |
2736 | : USB_STATE_DEFAULT); | |
75d7cf72 AX |
2737 | break; |
2738 | } | |
2739 | } | |
2740 | ||
2741 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ | |
1da177e4 | 2742 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2743 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2744 | { |
2745 | int i, status; | |
a24a6078 | 2746 | u16 portchange, portstatus; |
d99f6b41 | 2747 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1da177e4 | 2748 | |
0fe51aa5 SS |
2749 | if (!hub_is_superspeed(hub->hdev)) { |
2750 | if (warm) { | |
75d7cf72 AX |
2751 | dev_err(hub->intfdev, "only USB3 hub support " |
2752 | "warm reset\n"); | |
2753 | return -EINVAL; | |
2754 | } | |
0fe51aa5 SS |
2755 | /* Block EHCI CF initialization during the port reset. |
2756 | * Some companion controllers don't like it when they mix. | |
2757 | */ | |
2758 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2759 | } else if (!warm) { |
2760 | /* | |
2761 | * If the caller hasn't explicitly requested a warm reset, | |
2762 | * double check and see if one is needed. | |
2763 | */ | |
2764 | status = hub_port_status(hub, port1, | |
2765 | &portstatus, &portchange); | |
2766 | if (status < 0) | |
2767 | goto done; | |
2768 | ||
3cd12f91 | 2769 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
d3b9d7a9 | 2770 | warm = true; |
75d7cf72 | 2771 | } |
3cd12f91 | 2772 | clear_bit(port1, hub->warm_reset_bits); |
32fe0198 | 2773 | |
1da177e4 LT |
2774 | /* Reset the port */ |
2775 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2776 | status = set_port_feature(hub->hdev, port1, (warm ? |
2777 | USB_PORT_FEAT_BH_PORT_RESET : | |
2778 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2779 | if (status == -ENODEV) { |
2780 | ; /* The hub is gone */ | |
2781 | } else if (status) { | |
d99f6b41 DW |
2782 | dev_err(&port_dev->dev, |
2783 | "cannot %sreset (err = %d)\n", | |
2784 | warm ? "warm " : "", status); | |
75d7cf72 AX |
2785 | } else { |
2786 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2787 | warm); | |
e9e88fb7 | 2788 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2789 | dev_dbg(hub->intfdev, |
2790 | "port_wait_reset: err = %d\n", | |
2791 | status); | |
2792 | } | |
2793 | ||
a24a6078 | 2794 | /* Check for disconnect or reset */ |
75d7cf72 | 2795 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
a24a6078 SS |
2796 | hub_port_finish_reset(hub, port1, udev, &status); |
2797 | ||
2798 | if (!hub_is_superspeed(hub->hdev)) | |
2799 | goto done; | |
2800 | ||
2801 | /* | |
2802 | * If a USB 3.0 device migrates from reset to an error | |
2803 | * state, re-issue the warm reset. | |
2804 | */ | |
2805 | if (hub_port_status(hub, port1, | |
2806 | &portstatus, &portchange) < 0) | |
2807 | goto done; | |
2808 | ||
3cd12f91 DW |
2809 | if (!hub_port_warm_reset_required(hub, port1, |
2810 | portstatus)) | |
a24a6078 SS |
2811 | goto done; |
2812 | ||
2813 | /* | |
2814 | * If the port is in SS.Inactive or Compliance Mode, the | |
2815 | * hot or warm reset failed. Try another warm reset. | |
2816 | */ | |
2817 | if (!warm) { | |
d99f6b41 DW |
2818 | dev_dbg(&port_dev->dev, |
2819 | "hot reset failed, warm reset\n"); | |
a24a6078 SS |
2820 | warm = true; |
2821 | } | |
1da177e4 LT |
2822 | } |
2823 | ||
d99f6b41 DW |
2824 | dev_dbg(&port_dev->dev, |
2825 | "not enabled, trying %sreset again...\n", | |
2826 | warm ? "warm " : ""); | |
1da177e4 LT |
2827 | delay = HUB_LONG_RESET_TIME; |
2828 | } | |
2829 | ||
d99f6b41 | 2830 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
1da177e4 | 2831 | |
75d7cf72 | 2832 | done: |
0fe51aa5 | 2833 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2834 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2835 | |
75d7cf72 | 2836 | return status; |
5e467f6e AX |
2837 | } |
2838 | ||
0ed9a57e AX |
2839 | /* Check if a port is power on */ |
2840 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2841 | { | |
2842 | int ret = 0; | |
2843 | ||
2844 | if (hub_is_superspeed(hub->hdev)) { | |
2845 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2846 | ret = 1; | |
2847 | } else { | |
2848 | if (portstatus & USB_PORT_STAT_POWER) | |
2849 | ret = 1; | |
2850 | } | |
2851 | ||
2852 | return ret; | |
2853 | } | |
2854 | ||
5c79a1e3 DW |
2855 | static void usb_lock_port(struct usb_port *port_dev) |
2856 | __acquires(&port_dev->status_lock) | |
2857 | { | |
2858 | mutex_lock(&port_dev->status_lock); | |
2859 | __acquire(&port_dev->status_lock); | |
2860 | } | |
2861 | ||
2862 | static void usb_unlock_port(struct usb_port *port_dev) | |
2863 | __releases(&port_dev->status_lock) | |
2864 | { | |
2865 | mutex_unlock(&port_dev->status_lock); | |
2866 | __release(&port_dev->status_lock); | |
2867 | } | |
2868 | ||
d388dab7 | 2869 | #ifdef CONFIG_PM |
1da177e4 | 2870 | |
0ed9a57e AX |
2871 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2872 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2873 | { | |
2874 | int ret = 0; | |
2875 | ||
2876 | if (hub_is_superspeed(hub->hdev)) { | |
2877 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2878 | == USB_SS_PORT_LS_U3) | |
2879 | ret = 1; | |
2880 | } else { | |
2881 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2882 | ret = 1; | |
2883 | } | |
2884 | ||
2885 | return ret; | |
2886 | } | |
b01b03f3 AS |
2887 | |
2888 | /* Determine whether the device on a port is ready for a normal resume, | |
2889 | * is ready for a reset-resume, or should be disconnected. | |
2890 | */ | |
2891 | static int check_port_resume_type(struct usb_device *udev, | |
2892 | struct usb_hub *hub, int port1, | |
2893 | int status, unsigned portchange, unsigned portstatus) | |
2894 | { | |
d99f6b41 DW |
2895 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
2896 | ||
3cd12f91 DW |
2897 | /* Is a warm reset needed to recover the connection? */ |
2898 | if (status == 0 && udev->reset_resume | |
2899 | && hub_port_warm_reset_required(hub, port1, portstatus)) { | |
2900 | /* pass */; | |
2901 | } | |
b01b03f3 | 2902 | /* Is the device still present? */ |
3cd12f91 | 2903 | else if (status || port_is_suspended(hub, portstatus) || |
0ed9a57e AX |
2904 | !port_is_power_on(hub, portstatus) || |
2905 | !(portstatus & USB_PORT_STAT_CONNECTION)) { | |
b01b03f3 AS |
2906 | if (status >= 0) |
2907 | status = -ENODEV; | |
2908 | } | |
2909 | ||
86c57edf AS |
2910 | /* Can't do a normal resume if the port isn't enabled, |
2911 | * so try a reset-resume instead. | |
2912 | */ | |
2913 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2914 | if (udev->persist_enabled) | |
2915 | udev->reset_resume = 1; | |
2916 | else | |
2917 | status = -ENODEV; | |
2918 | } | |
b01b03f3 AS |
2919 | |
2920 | if (status) { | |
d99f6b41 DW |
2921 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
2922 | portchange, portstatus, status); | |
b01b03f3 AS |
2923 | } else if (udev->reset_resume) { |
2924 | ||
2925 | /* Late port handoff can set status-change bits */ | |
2926 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 2927 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2928 | USB_PORT_FEAT_C_CONNECTION); |
2929 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 2930 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2931 | USB_PORT_FEAT_C_ENABLE); |
2932 | } | |
2933 | ||
2934 | return status; | |
2935 | } | |
2936 | ||
f74631e3 SS |
2937 | int usb_disable_ltm(struct usb_device *udev) |
2938 | { | |
2939 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2940 | ||
2941 | /* Check if the roothub and device supports LTM. */ | |
2942 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2943 | !usb_device_supports_ltm(udev)) | |
2944 | return 0; | |
2945 | ||
2946 | /* Clear Feature LTM Enable can only be sent if the device is | |
2947 | * configured. | |
2948 | */ | |
2949 | if (!udev->actconfig) | |
2950 | return 0; | |
2951 | ||
2952 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2953 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2954 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2955 | USB_CTRL_SET_TIMEOUT); | |
2956 | } | |
2957 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
2958 | ||
2959 | void usb_enable_ltm(struct usb_device *udev) | |
2960 | { | |
2961 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2962 | ||
2963 | /* Check if the roothub and device supports LTM. */ | |
2964 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2965 | !usb_device_supports_ltm(udev)) | |
2966 | return; | |
2967 | ||
2968 | /* Set Feature LTM Enable can only be sent if the device is | |
2969 | * configured. | |
2970 | */ | |
2971 | if (!udev->actconfig) | |
2972 | return; | |
2973 | ||
2974 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2975 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2976 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2977 | USB_CTRL_SET_TIMEOUT); | |
2978 | } | |
2979 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
2980 | ||
54a3ac0c | 2981 | /* |
28e86165 | 2982 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
2983 | * @udev: target device |
2984 | * | |
28e86165 AS |
2985 | * For USB-2 devices: Set the device's remote wakeup feature. |
2986 | * | |
2987 | * For USB-3 devices: Assume there's only one function on the device and | |
2988 | * enable remote wake for the first interface. FIXME if the interface | |
2989 | * association descriptor shows there's more than one function. | |
54a3ac0c | 2990 | */ |
28e86165 | 2991 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 2992 | { |
28e86165 AS |
2993 | if (udev->speed < USB_SPEED_SUPER) |
2994 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2995 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2996 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
2997 | USB_CTRL_SET_TIMEOUT); | |
2998 | else | |
2999 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3000 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
3001 | USB_INTRF_FUNC_SUSPEND, | |
3002 | USB_INTRF_FUNC_SUSPEND_RW | | |
3003 | USB_INTRF_FUNC_SUSPEND_LP, | |
3004 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3005 | } | |
3006 | ||
3007 | /* | |
3008 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
3009 | * @udev: target device | |
3010 | * | |
3011 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
3012 | * | |
3013 | * For USB-3 devices: Assume there's only one function on the device and | |
3014 | * disable remote wake for the first interface. FIXME if the interface | |
3015 | * association descriptor shows there's more than one function. | |
3016 | */ | |
3017 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
3018 | { | |
3019 | if (udev->speed < USB_SPEED_SUPER) | |
3020 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3021 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3022 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3023 | USB_CTRL_SET_TIMEOUT); | |
3024 | else | |
3025 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
54a3ac0c LT |
3026 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
3027 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, | |
3028 | USB_CTRL_SET_TIMEOUT); | |
3029 | } | |
1da177e4 | 3030 | |
e583d9db AS |
3031 | /* Count of wakeup-enabled devices at or below udev */ |
3032 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
3033 | { | |
3034 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
3035 | ||
3036 | return udev->do_remote_wakeup + | |
3037 | (hub ? hub->wakeup_enabled_descendants : 0); | |
3038 | } | |
3039 | ||
1da177e4 | 3040 | /* |
624d6c07 AS |
3041 | * usb_port_suspend - suspend a usb device's upstream port |
3042 | * @udev: device that's no longer in active use, not a root hub | |
3043 | * Context: must be able to sleep; device not locked; pm locks held | |
3044 | * | |
3045 | * Suspends a USB device that isn't in active use, conserving power. | |
3046 | * Devices may wake out of a suspend, if anything important happens, | |
3047 | * using the remote wakeup mechanism. They may also be taken out of | |
3048 | * suspend by the host, using usb_port_resume(). It's also routine | |
3049 | * to disconnect devices while they are suspended. | |
3050 | * | |
3051 | * This only affects the USB hardware for a device; its interfaces | |
3052 | * (and, for hubs, child devices) must already have been suspended. | |
3053 | * | |
1da177e4 LT |
3054 | * Selective port suspend reduces power; most suspended devices draw |
3055 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
3056 | * All devices below the suspended port are also suspended. | |
3057 | * | |
3058 | * Devices leave suspend state when the host wakes them up. Some devices | |
3059 | * also support "remote wakeup", where the device can activate the USB | |
3060 | * tree above them to deliver data, such as a keypress or packet. In | |
3061 | * some cases, this wakes the USB host. | |
624d6c07 AS |
3062 | * |
3063 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
3064 | * between a pair of dual-role devices. That will change roles, such | |
3065 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
3066 | * | |
3067 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
3068 | * to ACPI D2, "may cause the device to lose some context". | |
3069 | * State transitions include: | |
3070 | * | |
3071 | * - suspend, resume ... when the VBUS power link stays live | |
3072 | * - suspend, disconnect ... VBUS lost | |
3073 | * | |
3074 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
3075 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
3076 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
3077 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
3078 | * timer, no SRP, no requests through sysfs. | |
3079 | * | |
e583d9db AS |
3080 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
3081 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
3082 | * hub is suspended). Nevertheless, we change @udev->state to |
3083 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
3084 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
3085 | * |
3086 | * Returns 0 on success, else negative errno. | |
1da177e4 | 3087 | */ |
65bfd296 | 3088 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3089 | { |
ad493e5e LT |
3090 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3091 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3092 | int port1 = udev->portnum; |
3093 | int status; | |
0aa2832d | 3094 | bool really_suspend = true; |
1da177e4 | 3095 | |
5c79a1e3 DW |
3096 | usb_lock_port(port_dev); |
3097 | ||
1da177e4 LT |
3098 | /* enable remote wakeup when appropriate; this lets the device |
3099 | * wake up the upstream hub (including maybe the root hub). | |
3100 | * | |
3101 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
3102 | * we don't explicitly enable it here. | |
3103 | */ | |
645daaab | 3104 | if (udev->do_remote_wakeup) { |
28e86165 | 3105 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 3106 | if (status) { |
624d6c07 AS |
3107 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
3108 | status); | |
0c487206 | 3109 | /* bail if autosuspend is requested */ |
5b1b0b81 | 3110 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 3111 | goto err_wakeup; |
0c487206 | 3112 | } |
1da177e4 LT |
3113 | } |
3114 | ||
65580b43 AX |
3115 | /* disable USB2 hardware LPM */ |
3116 | if (udev->usb2_hw_lpm_enabled == 1) | |
3117 | usb_set_usb2_hardware_lpm(udev, 0); | |
3118 | ||
f74631e3 | 3119 | if (usb_disable_ltm(udev)) { |
4fae6f0f AS |
3120 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
3121 | status = -ENOMEM; | |
3122 | if (PMSG_IS_AUTO(msg)) | |
3123 | goto err_ltm; | |
f74631e3 | 3124 | } |
8306095f | 3125 | if (usb_unlocked_disable_lpm(udev)) { |
4fae6f0f AS |
3126 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
3127 | status = -ENOMEM; | |
3128 | if (PMSG_IS_AUTO(msg)) | |
3129 | goto err_lpm3; | |
8306095f SS |
3130 | } |
3131 | ||
1da177e4 | 3132 | /* see 7.1.7.6 */ |
a7114230 | 3133 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3134 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3135 | |
0aa2832d AS |
3136 | /* |
3137 | * For system suspend, we do not need to enable the suspend feature | |
3138 | * on individual USB-2 ports. The devices will automatically go | |
3139 | * into suspend a few ms after the root hub stops sending packets. | |
3140 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3141 | * |
3142 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3143 | * from a downstream port if the port's suspend feature isn't on. | |
3144 | * Therefore we will turn on the suspend feature if udev or any of its | |
3145 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3146 | */ |
e583d9db AS |
3147 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3148 | status = set_port_feature(hub->hdev, port1, | |
3149 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3150 | else { |
3151 | really_suspend = false; | |
3152 | status = 0; | |
3153 | } | |
1da177e4 | 3154 | if (status) { |
d99f6b41 | 3155 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
cbb33004 | 3156 | |
4fae6f0f AS |
3157 | /* Try to enable USB3 LPM and LTM again */ |
3158 | usb_unlocked_enable_lpm(udev); | |
3159 | err_lpm3: | |
3160 | usb_enable_ltm(udev); | |
3161 | err_ltm: | |
c3e751e4 AX |
3162 | /* Try to enable USB2 hardware LPM again */ |
3163 | if (udev->usb2_hw_lpm_capable == 1) | |
3164 | usb_set_usb2_hardware_lpm(udev, 1); | |
3165 | ||
4fae6f0f AS |
3166 | if (udev->do_remote_wakeup) |
3167 | (void) usb_disable_remote_wakeup(udev); | |
3168 | err_wakeup: | |
8306095f | 3169 | |
cbb33004 | 3170 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3171 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3172 | status = 0; |
1da177e4 | 3173 | } else { |
30b1a7a3 AS |
3174 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3175 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3176 | udev->do_remote_wakeup); | |
0aa2832d AS |
3177 | if (really_suspend) { |
3178 | udev->port_is_suspended = 1; | |
e583d9db AS |
3179 | |
3180 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3181 | msleep(10); |
3182 | } | |
e583d9db | 3183 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3184 | } |
ad493e5e | 3185 | |
d5c3834e DW |
3186 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
3187 | && test_and_clear_bit(port1, hub->child_usage_bits)) | |
98a4f1ff | 3188 | pm_runtime_put_sync(&port_dev->dev); |
ad493e5e | 3189 | |
c08512c7 | 3190 | usb_mark_last_busy(hub->hdev); |
5c79a1e3 DW |
3191 | |
3192 | usb_unlock_port(port_dev); | |
1da177e4 LT |
3193 | return status; |
3194 | } | |
3195 | ||
1da177e4 | 3196 | /* |
390a8c34 DB |
3197 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3198 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3199 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3200 | * hardware resume signaling is finished, either because of selective |
3201 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3202 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3203 | * |
3204 | * If @udev->reset_resume is set then the device is reset before the | |
3205 | * status check is done. | |
1da177e4 | 3206 | */ |
140d8f68 | 3207 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3208 | { |
54515fe5 | 3209 | int status = 0; |
07e72b95 | 3210 | u16 devstatus = 0; |
1da177e4 LT |
3211 | |
3212 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3213 | dev_dbg(&udev->dev, "%s\n", |
3214 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3215 | |
3216 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3217 | * state the device resumes to. Linux currently won't see the | |
3218 | * first two on the host side; they'd be inside hub_port_init() | |
3219 | * during many timeouts, but khubd can't suspend until later. | |
3220 | */ | |
3221 | usb_set_device_state(udev, udev->actconfig | |
3222 | ? USB_STATE_CONFIGURED | |
3223 | : USB_STATE_ADDRESS); | |
1da177e4 | 3224 | |
54515fe5 AS |
3225 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3226 | * device is enabled for remote wakeup. Hence the reset | |
3227 | * operation is carried out here, after the port has been | |
3228 | * resumed. | |
3229 | */ | |
1d10255c AS |
3230 | if (udev->reset_resume) { |
3231 | /* | |
3232 | * If the device morphs or switches modes when it is reset, | |
3233 | * we don't want to perform a reset-resume. We'll fail the | |
3234 | * resume, which will cause a logical disconnect, and then | |
3235 | * the device will be rediscovered. | |
3236 | */ | |
86c57edf | 3237 | retry_reset_resume: |
1d10255c AS |
3238 | if (udev->quirks & USB_QUIRK_RESET) |
3239 | status = -ENODEV; | |
3240 | else | |
3241 | status = usb_reset_and_verify_device(udev); | |
3242 | } | |
54515fe5 | 3243 | |
469271f8 MB |
3244 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3245 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3246 | * and device drivers will know about any resume quirks. |
3247 | */ | |
54515fe5 | 3248 | if (status == 0) { |
46dede46 | 3249 | devstatus = 0; |
54515fe5 | 3250 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3251 | |
3252 | /* If a normal resume failed, try doing a reset-resume */ | |
3253 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3254 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3255 | udev->reset_resume = 1; | |
3256 | goto retry_reset_resume; | |
3257 | } | |
54515fe5 | 3258 | } |
b40b7a90 | 3259 | |
624d6c07 AS |
3260 | if (status) { |
3261 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3262 | status); | |
07e72b95 ON |
3263 | /* |
3264 | * There are a few quirky devices which violate the standard | |
3265 | * by claiming to have remote wakeup enabled after a reset, | |
3266 | * which crash if the feature is cleared, hence check for | |
3267 | * udev->reset_resume | |
3268 | */ | |
3269 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3270 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3271 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3272 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c LT |
3273 | } else { |
3274 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, | |
3275 | &devstatus); | |
54a3ac0c LT |
3276 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3277 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3278 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3279 | } |
54a3ac0c LT |
3280 | |
3281 | if (status) | |
3282 | dev_dbg(&udev->dev, | |
3283 | "disable remote wakeup, status %d\n", | |
3284 | status); | |
1da177e4 | 3285 | status = 0; |
1da177e4 LT |
3286 | } |
3287 | return status; | |
3288 | } | |
3289 | ||
a40178b2 PA |
3290 | /* |
3291 | * There are some SS USB devices which take longer time for link training. | |
3292 | * XHCI specs 4.19.4 says that when Link training is successful, port | |
3293 | * sets CSC bit to 1. So if SW reads port status before successful link | |
3294 | * training, then it will not find device to be present. | |
3295 | * USB Analyzer log with such buggy devices show that in some cases | |
3296 | * device switch on the RX termination after long delay of host enabling | |
3297 | * the VBUS. In few other cases it has been seen that device fails to | |
3298 | * negotiate link training in first attempt. It has been | |
3299 | * reported till now that few devices take as long as 2000 ms to train | |
3300 | * the link after host enabling its VBUS and termination. Following | |
3301 | * routine implements a 2000 ms timeout for link training. If in a case | |
3302 | * link trains before timeout, loop will exit earlier. | |
3303 | * | |
3304 | * FIXME: If a device was connected before suspend, but was removed | |
3305 | * while system was asleep, then the loop in the following routine will | |
3306 | * only exit at timeout. | |
3307 | * | |
3308 | * This routine should only be called when persist is enabled for a SS | |
3309 | * device. | |
3310 | */ | |
3311 | static int wait_for_ss_port_enable(struct usb_device *udev, | |
3312 | struct usb_hub *hub, int *port1, | |
3313 | u16 *portchange, u16 *portstatus) | |
3314 | { | |
3315 | int status = 0, delay_ms = 0; | |
3316 | ||
3317 | while (delay_ms < 2000) { | |
3318 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) | |
3319 | break; | |
3320 | msleep(20); | |
3321 | delay_ms += 20; | |
3322 | status = hub_port_status(hub, *port1, portstatus, portchange); | |
3323 | } | |
3324 | return status; | |
3325 | } | |
3326 | ||
624d6c07 AS |
3327 | /* |
3328 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3329 | * @udev: device to re-activate, not a root hub | |
3330 | * Context: must be able to sleep; device not locked; pm locks held | |
3331 | * | |
3332 | * This will re-activate the suspended device, increasing power usage | |
3333 | * while letting drivers communicate again with its endpoints. | |
3334 | * USB resume explicitly guarantees that the power session between | |
3335 | * the host and the device is the same as it was when the device | |
3336 | * suspended. | |
3337 | * | |
feccc30d AS |
3338 | * If @udev->reset_resume is set then this routine won't check that the |
3339 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3340 | * reset @udev. The end result is that a broken power session can be |
3341 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3342 | * | |
3343 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3344 | * during a system sleep or is reset when the system wakes up, all the USB | |
3345 | * power sessions below it will be broken. This is especially troublesome | |
3346 | * for mass-storage devices containing mounted filesystems, since the | |
3347 | * device will appear to have disconnected and all the memory mappings | |
3348 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3349 | * made to appear as if it had not disconnected. | |
3350 | * | |
742120c6 | 3351 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3352 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3353 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3354 | * quite possible for a device to remain unaltered but its media to be | |
3355 | * changed. If the user replaces a flash memory card while the system is | |
3356 | * asleep, he will have only himself to blame when the filesystem on the | |
3357 | * new card is corrupted and the system crashes. | |
3358 | * | |
624d6c07 AS |
3359 | * Returns 0 on success, else negative errno. |
3360 | */ | |
65bfd296 | 3361 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3362 | { |
ad493e5e LT |
3363 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3364 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3365 | int port1 = udev->portnum; |
3366 | int status; | |
3367 | u16 portchange, portstatus; | |
d25450c6 | 3368 | |
d5c3834e | 3369 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
ad493e5e | 3370 | status = pm_runtime_get_sync(&port_dev->dev); |
ad493e5e LT |
3371 | if (status < 0) { |
3372 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3373 | status); | |
3374 | return status; | |
3375 | } | |
3376 | } | |
3377 | ||
5c79a1e3 DW |
3378 | usb_lock_port(port_dev); |
3379 | ||
d25450c6 AS |
3380 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3381 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3382 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3383 | goto SuspendCleared; |
1da177e4 | 3384 | |
1da177e4 | 3385 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3386 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3387 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3388 | else |
ad493e5e | 3389 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3390 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3391 | if (status) { |
d99f6b41 | 3392 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
1da177e4 | 3393 | } else { |
1da177e4 | 3394 | /* drive resume for at least 20 msec */ |
686314cf | 3395 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3396 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
1da177e4 LT |
3397 | msleep(25); |
3398 | ||
1da177e4 LT |
3399 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3400 | * stop resume signaling. Then finish the resume | |
3401 | * sequence. | |
3402 | */ | |
d25450c6 | 3403 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3404 | |
b01b03f3 AS |
3405 | /* TRSMRCY = 10 msec */ |
3406 | msleep(10); | |
3407 | } | |
3408 | ||
54515fe5 | 3409 | SuspendCleared: |
b01b03f3 | 3410 | if (status == 0) { |
bfd1e910 | 3411 | udev->port_is_suspended = 0; |
a7114230 AX |
3412 | if (hub_is_superspeed(hub->hdev)) { |
3413 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3414 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3415 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3416 | } else { | |
3417 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3418 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3419 | USB_PORT_FEAT_C_SUSPEND); |
3420 | } | |
1da177e4 | 3421 | } |
1da177e4 | 3422 | |
a40178b2 PA |
3423 | if (udev->persist_enabled && hub_is_superspeed(hub->hdev)) |
3424 | status = wait_for_ss_port_enable(udev, hub, &port1, &portchange, | |
3425 | &portstatus); | |
3426 | ||
b01b03f3 AS |
3427 | status = check_port_resume_type(udev, |
3428 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3429 | if (status == 0) |
3430 | status = finish_port_resume(udev); | |
3431 | if (status < 0) { | |
3432 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3433 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3434 | } else { |
3435 | /* Try to enable USB2 hardware LPM */ | |
3436 | if (udev->usb2_hw_lpm_capable == 1) | |
3437 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3438 | |
f74631e3 SS |
3439 | /* Try to enable USB3 LTM and LPM */ |
3440 | usb_enable_ltm(udev); | |
8306095f | 3441 | usb_unlocked_enable_lpm(udev); |
54515fe5 | 3442 | } |
65580b43 | 3443 | |
5c79a1e3 DW |
3444 | usb_unlock_port(port_dev); |
3445 | ||
1da177e4 LT |
3446 | return status; |
3447 | } | |
3448 | ||
84ebc102 AS |
3449 | #ifdef CONFIG_PM_RUNTIME |
3450 | ||
0534d468 | 3451 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3452 | { |
3453 | int status = 0; | |
3454 | ||
5c79a1e3 | 3455 | usb_lock_device(udev); |
1da177e4 | 3456 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3457 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3458 | status = usb_autoresume_device(udev); |
3459 | if (status == 0) { | |
3460 | /* Let the drivers do their thing, then... */ | |
3461 | usb_autosuspend_device(udev); | |
3462 | } | |
1da177e4 | 3463 | } |
5c79a1e3 | 3464 | usb_unlock_device(udev); |
1da177e4 LT |
3465 | return status; |
3466 | } | |
3467 | ||
7e73be22 DW |
3468 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
3469 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3470 | u16 portstatus, u16 portchange) | |
3471 | __must_hold(&port_dev->status_lock) | |
3472 | { | |
3473 | struct usb_port *port_dev = hub->ports[port - 1]; | |
3474 | struct usb_device *hdev; | |
3475 | struct usb_device *udev; | |
3476 | int connect_change = 0; | |
3477 | int ret; | |
3478 | ||
3479 | hdev = hub->hdev; | |
3480 | udev = port_dev->child; | |
3481 | if (!hub_is_superspeed(hdev)) { | |
3482 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
3483 | return 0; | |
3484 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); | |
3485 | } else { | |
3486 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
3487 | (portstatus & USB_PORT_STAT_LINK_STATE) != | |
3488 | USB_SS_PORT_LS_U0) | |
3489 | return 0; | |
3490 | } | |
3491 | ||
3492 | if (udev) { | |
3493 | /* TRSMRCY = 10 msec */ | |
3494 | msleep(10); | |
3495 | ||
3496 | usb_unlock_port(port_dev); | |
3497 | ret = usb_remote_wakeup(udev); | |
3498 | usb_lock_port(port_dev); | |
3499 | if (ret < 0) | |
3500 | connect_change = 1; | |
3501 | } else { | |
3502 | ret = -ENODEV; | |
3503 | hub_port_disable(hub, port, 1); | |
3504 | } | |
3505 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); | |
3506 | return connect_change; | |
3507 | } | |
3508 | ||
3509 | #else | |
3510 | ||
3511 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3512 | u16 portstatus, u16 portchange) | |
3513 | { | |
3514 | return 0; | |
3515 | } | |
3516 | ||
d388dab7 AS |
3517 | #endif |
3518 | ||
e6f30dea ML |
3519 | static int check_ports_changed(struct usb_hub *hub) |
3520 | { | |
3521 | int port1; | |
3522 | ||
3523 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3524 | u16 portstatus, portchange; | |
3525 | int status; | |
3526 | ||
3527 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3528 | if (!status && portchange) | |
3529 | return 1; | |
3530 | } | |
3531 | return 0; | |
3532 | } | |
3533 | ||
db690874 | 3534 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
3535 | { |
3536 | struct usb_hub *hub = usb_get_intfdata (intf); | |
3537 | struct usb_device *hdev = hub->hdev; | |
3538 | unsigned port1; | |
4296c70a | 3539 | int status; |
1da177e4 | 3540 | |
e583d9db AS |
3541 | /* |
3542 | * Warn if children aren't already suspended. | |
3543 | * Also, add up the number of wakeup-enabled descendants. | |
3544 | */ | |
3545 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 | 3546 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
d99f6b41 DW |
3547 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
3548 | struct usb_device *udev = port_dev->child; | |
1da177e4 | 3549 | |
6840d255 | 3550 | if (udev && udev->can_submit) { |
b658b8f5 DW |
3551 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
3552 | dev_name(&udev->dev)); | |
5b1b0b81 | 3553 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3554 | return -EBUSY; |
c9f89fa4 | 3555 | } |
e583d9db AS |
3556 | if (udev) |
3557 | hub->wakeup_enabled_descendants += | |
3558 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3559 | } |
e6f30dea ML |
3560 | |
3561 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3562 | /* check if there are changes pending on hub ports */ | |
3563 | if (check_ports_changed(hub)) { | |
3564 | if (PMSG_IS_AUTO(msg)) | |
3565 | return -EBUSY; | |
3566 | pm_wakeup_event(&hdev->dev, 2000); | |
3567 | } | |
3568 | } | |
3569 | ||
4296c70a SS |
3570 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3571 | /* Enable hub to send remote wakeup for all ports. */ | |
3572 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3573 | status = set_port_feature(hdev, | |
3574 | port1 | | |
3575 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3576 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3577 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3578 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3579 | } | |
3580 | } | |
1da177e4 | 3581 | |
441b62c1 | 3582 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3583 | |
12f1ff83 | 3584 | /* stop khubd and related activity */ |
4330354f | 3585 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3586 | return 0; |
1da177e4 LT |
3587 | } |
3588 | ||
3589 | static int hub_resume(struct usb_interface *intf) | |
3590 | { | |
5e6effae | 3591 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3592 | |
5e6effae | 3593 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3594 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3595 | return 0; |
3596 | } | |
3597 | ||
b41a60ec | 3598 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3599 | { |
b41a60ec | 3600 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3601 | |
5e6effae | 3602 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3603 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3604 | return 0; |
3605 | } | |
3606 | ||
54515fe5 AS |
3607 | /** |
3608 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3609 | * @rhdev: struct usb_device for the root hub | |
3610 | * | |
3611 | * The USB host controller driver calls this function when its root hub | |
3612 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3613 | * has been reset. The routine marks @rhdev as having lost power. |
3614 | * When the hub driver is resumed it will take notice and carry out | |
3615 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3616 | * the others will be disconnected. | |
54515fe5 AS |
3617 | */ |
3618 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3619 | { | |
3620 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3621 | rhdev->reset_resume = 1; | |
3622 | } | |
3623 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3624 | ||
1ea7e0e8 SS |
3625 | static const char * const usb3_lpm_names[] = { |
3626 | "U0", | |
3627 | "U1", | |
3628 | "U2", | |
3629 | "U3", | |
3630 | }; | |
3631 | ||
3632 | /* | |
3633 | * Send a Set SEL control transfer to the device, prior to enabling | |
3634 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3635 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3636 | * packet from the host. | |
3637 | * | |
3638 | * This function will fail if the SEL or PEL values for udev are greater than | |
3639 | * the maximum allowed values for the link state to be enabled. | |
3640 | */ | |
3641 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3642 | { | |
3643 | struct usb_set_sel_req *sel_values; | |
3644 | unsigned long long u1_sel; | |
3645 | unsigned long long u1_pel; | |
3646 | unsigned long long u2_sel; | |
3647 | unsigned long long u2_pel; | |
3648 | int ret; | |
3649 | ||
38d7f688 XR |
3650 | if (udev->state != USB_STATE_CONFIGURED) |
3651 | return 0; | |
3652 | ||
1ea7e0e8 SS |
3653 | /* Convert SEL and PEL stored in ns to us */ |
3654 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3655 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3656 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3657 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3658 | ||
3659 | /* | |
3660 | * Make sure that the calculated SEL and PEL values for the link | |
3661 | * state we're enabling aren't bigger than the max SEL/PEL | |
3662 | * value that will fit in the SET SEL control transfer. | |
3663 | * Otherwise the device would get an incorrect idea of the exit | |
3664 | * latency for the link state, and could start a device-initiated | |
3665 | * U1/U2 when the exit latencies are too high. | |
3666 | */ | |
3667 | if ((state == USB3_LPM_U1 && | |
3668 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3669 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3670 | (state == USB3_LPM_U2 && | |
3671 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3672 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3673 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3674 | usb3_lpm_names[state], u1_sel, u1_pel); |
3675 | return -EINVAL; | |
3676 | } | |
3677 | ||
3678 | /* | |
3679 | * If we're enabling device-initiated LPM for one link state, | |
3680 | * but the other link state has a too high SEL or PEL value, | |
3681 | * just set those values to the max in the Set SEL request. | |
3682 | */ | |
3683 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3684 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3685 | ||
3686 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3687 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3688 | ||
3689 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3690 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3691 | ||
3692 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3693 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3694 | ||
3695 | /* | |
3696 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3697 | * which may be initiated by an error path of a mass storage driver. | |
3698 | * Therefore, use GFP_NOIO. | |
3699 | */ | |
3700 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3701 | if (!sel_values) | |
3702 | return -ENOMEM; | |
3703 | ||
3704 | sel_values->u1_sel = u1_sel; | |
3705 | sel_values->u1_pel = u1_pel; | |
3706 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3707 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3708 | ||
3709 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3710 | USB_REQ_SET_SEL, | |
3711 | USB_RECIP_DEVICE, | |
3712 | 0, 0, | |
3713 | sel_values, sizeof *(sel_values), | |
3714 | USB_CTRL_SET_TIMEOUT); | |
3715 | kfree(sel_values); | |
3716 | return ret; | |
3717 | } | |
3718 | ||
3719 | /* | |
3720 | * Enable or disable device-initiated U1 or U2 transitions. | |
3721 | */ | |
3722 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3723 | enum usb3_link_state state, bool enable) | |
3724 | { | |
3725 | int ret; | |
3726 | int feature; | |
3727 | ||
3728 | switch (state) { | |
3729 | case USB3_LPM_U1: | |
3730 | feature = USB_DEVICE_U1_ENABLE; | |
3731 | break; | |
3732 | case USB3_LPM_U2: | |
3733 | feature = USB_DEVICE_U2_ENABLE; | |
3734 | break; | |
3735 | default: | |
3736 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3737 | __func__, enable ? "enable" : "disable"); | |
3738 | return -EINVAL; | |
3739 | } | |
3740 | ||
3741 | if (udev->state != USB_STATE_CONFIGURED) { | |
3742 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3743 | "for unconfigured device.\n", | |
3744 | __func__, enable ? "enable" : "disable", | |
3745 | usb3_lpm_names[state]); | |
3746 | return 0; | |
3747 | } | |
3748 | ||
3749 | if (enable) { | |
1ea7e0e8 SS |
3750 | /* |
3751 | * Now send the control transfer to enable device-initiated LPM | |
3752 | * for either U1 or U2. | |
3753 | */ | |
3754 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3755 | USB_REQ_SET_FEATURE, | |
3756 | USB_RECIP_DEVICE, | |
3757 | feature, | |
3758 | 0, NULL, 0, | |
3759 | USB_CTRL_SET_TIMEOUT); | |
3760 | } else { | |
3761 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3762 | USB_REQ_CLEAR_FEATURE, | |
3763 | USB_RECIP_DEVICE, | |
3764 | feature, | |
3765 | 0, NULL, 0, | |
3766 | USB_CTRL_SET_TIMEOUT); | |
3767 | } | |
3768 | if (ret < 0) { | |
3769 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3770 | enable ? "Enable" : "Disable", | |
3771 | usb3_lpm_names[state]); | |
3772 | return -EBUSY; | |
3773 | } | |
3774 | return 0; | |
3775 | } | |
3776 | ||
3777 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3778 | enum usb3_link_state state, int timeout) | |
3779 | { | |
3780 | int ret; | |
3781 | int feature; | |
3782 | ||
3783 | switch (state) { | |
3784 | case USB3_LPM_U1: | |
3785 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3786 | break; | |
3787 | case USB3_LPM_U2: | |
3788 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3789 | break; | |
3790 | default: | |
3791 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3792 | __func__); | |
3793 | return -EINVAL; | |
3794 | } | |
3795 | ||
3796 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3797 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3798 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3799 | "which is a reserved value.\n", | |
3800 | usb3_lpm_names[state], timeout); | |
3801 | return -EINVAL; | |
3802 | } | |
3803 | ||
3804 | ret = set_port_feature(udev->parent, | |
3805 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3806 | feature); | |
3807 | if (ret < 0) { | |
3808 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3809 | "error code %i\n", usb3_lpm_names[state], | |
3810 | timeout, ret); | |
3811 | return -EBUSY; | |
3812 | } | |
3813 | if (state == USB3_LPM_U1) | |
3814 | udev->u1_params.timeout = timeout; | |
3815 | else | |
3816 | udev->u2_params.timeout = timeout; | |
3817 | return 0; | |
3818 | } | |
3819 | ||
3820 | /* | |
3821 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3822 | * U1/U2 entry. | |
3823 | * | |
3824 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3825 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3826 | * will be successful. | |
3827 | * | |
3828 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3829 | * driver know about it. If that call fails, it should be harmless, and just | |
3830 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3831 | */ | |
3832 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3833 | enum usb3_link_state state) | |
3834 | { | |
65a95b75 | 3835 | int timeout, ret; |
ae8963ad SS |
3836 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3837 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3838 | ||
3839 | /* If the device says it doesn't have *any* exit latency to come out of | |
3840 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3841 | * state. | |
3842 | */ | |
3843 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3844 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3845 | return; | |
1ea7e0e8 | 3846 | |
65a95b75 SS |
3847 | /* |
3848 | * First, let the device know about the exit latencies | |
3849 | * associated with the link state we're about to enable. | |
3850 | */ | |
3851 | ret = usb_req_set_sel(udev, state); | |
3852 | if (ret < 0) { | |
3853 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3854 | usb3_lpm_names[state]); | |
3855 | return; | |
3856 | } | |
3857 | ||
1ea7e0e8 SS |
3858 | /* We allow the host controller to set the U1/U2 timeout internally |
3859 | * first, so that it can change its schedule to account for the | |
3860 | * additional latency to send data to a device in a lower power | |
3861 | * link state. | |
3862 | */ | |
3863 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3864 | ||
3865 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3866 | if (timeout == 0) | |
3867 | return; | |
3868 | ||
3869 | if (timeout < 0) { | |
3870 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3871 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3872 | timeout); | |
3873 | return; | |
3874 | } | |
3875 | ||
3876 | if (usb_set_lpm_timeout(udev, state, timeout)) | |
3877 | /* If we can't set the parent hub U1/U2 timeout, | |
3878 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3879 | * host know that this link state won't be enabled. | |
3880 | */ | |
3881 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
3882 | ||
3883 | /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ | |
3884 | else if (udev->actconfig) | |
3885 | usb_set_device_initiated_lpm(udev, state, true); | |
3886 | ||
3887 | } | |
3888 | ||
3889 | /* | |
3890 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3891 | * U1/U2 entry. | |
3892 | * | |
3893 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3894 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3895 | * | |
3896 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3897 | * it won't have an effect on the bus link state because the parent hub will | |
3898 | * still disallow device-initiated U1/U2 entry. | |
3899 | * | |
3900 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3901 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3902 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3903 | */ | |
3904 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3905 | enum usb3_link_state state) | |
3906 | { | |
3907 | int feature; | |
3908 | ||
3909 | switch (state) { | |
3910 | case USB3_LPM_U1: | |
3911 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3912 | break; | |
3913 | case USB3_LPM_U2: | |
3914 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3915 | break; | |
3916 | default: | |
3917 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
3918 | __func__); | |
3919 | return -EINVAL; | |
3920 | } | |
3921 | ||
3922 | if (usb_set_lpm_timeout(udev, state, 0)) | |
3923 | return -EBUSY; | |
3924 | ||
3925 | usb_set_device_initiated_lpm(udev, state, false); | |
3926 | ||
3927 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
3928 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
3929 | "bus schedule bandwidth may be impacted.\n", | |
3930 | usb3_lpm_names[state]); | |
3931 | return 0; | |
3932 | } | |
3933 | ||
3934 | /* | |
3935 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
3936 | * Caller must own the bandwidth_mutex. | |
3937 | * | |
3938 | * This will call usb_enable_lpm() on failure, which will decrement | |
3939 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
3940 | */ | |
3941 | int usb_disable_lpm(struct usb_device *udev) | |
3942 | { | |
3943 | struct usb_hcd *hcd; | |
3944 | ||
3945 | if (!udev || !udev->parent || | |
3946 | udev->speed != USB_SPEED_SUPER || | |
51df62ff PA |
3947 | !udev->lpm_capable || |
3948 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
3949 | return 0; |
3950 | ||
3951 | hcd = bus_to_hcd(udev->bus); | |
3952 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
3953 | return 0; | |
3954 | ||
3955 | udev->lpm_disable_count++; | |
55558c33 | 3956 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
3957 | return 0; |
3958 | ||
3959 | /* If LPM is enabled, attempt to disable it. */ | |
3960 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
3961 | goto enable_lpm; | |
3962 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
3963 | goto enable_lpm; | |
3964 | ||
3965 | return 0; | |
3966 | ||
3967 | enable_lpm: | |
3968 | usb_enable_lpm(udev); | |
3969 | return -EBUSY; | |
3970 | } | |
3971 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
3972 | ||
3973 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
3974 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3975 | { | |
3976 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3977 | int ret; | |
3978 | ||
3979 | if (!hcd) | |
3980 | return -EINVAL; | |
3981 | ||
3982 | mutex_lock(hcd->bandwidth_mutex); | |
3983 | ret = usb_disable_lpm(udev); | |
3984 | mutex_unlock(hcd->bandwidth_mutex); | |
3985 | ||
3986 | return ret; | |
3987 | } | |
3988 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
3989 | ||
3990 | /* | |
3991 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
3992 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
3993 | * | |
3994 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
3995 | * until the lpm_disable_count drops to zero. Caller must own the | |
3996 | * bandwidth_mutex. | |
3997 | */ | |
3998 | void usb_enable_lpm(struct usb_device *udev) | |
3999 | { | |
4000 | struct usb_hcd *hcd; | |
4001 | ||
4002 | if (!udev || !udev->parent || | |
4003 | udev->speed != USB_SPEED_SUPER || | |
51df62ff PA |
4004 | !udev->lpm_capable || |
4005 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4006 | return; |
4007 | ||
4008 | udev->lpm_disable_count--; | |
4009 | hcd = bus_to_hcd(udev->bus); | |
4010 | /* Double check that we can both enable and disable LPM. | |
4011 | * Device must be configured to accept set feature U1/U2 timeout. | |
4012 | */ | |
4013 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
4014 | !hcd->driver->disable_usb3_lpm_timeout) | |
4015 | return; | |
4016 | ||
4017 | if (udev->lpm_disable_count > 0) | |
4018 | return; | |
4019 | ||
4020 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
4021 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
4022 | } | |
4023 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
4024 | ||
4025 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
4026 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
4027 | { | |
4028 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4029 | ||
4030 | if (!hcd) | |
4031 | return; | |
4032 | ||
4033 | mutex_lock(hcd->bandwidth_mutex); | |
4034 | usb_enable_lpm(udev); | |
4035 | mutex_unlock(hcd->bandwidth_mutex); | |
4036 | } | |
4037 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
4038 | ||
4039 | ||
d388dab7 AS |
4040 | #else /* CONFIG_PM */ |
4041 | ||
f07600cf AS |
4042 | #define hub_suspend NULL |
4043 | #define hub_resume NULL | |
4044 | #define hub_reset_resume NULL | |
1ea7e0e8 SS |
4045 | |
4046 | int usb_disable_lpm(struct usb_device *udev) | |
4047 | { | |
4048 | return 0; | |
4049 | } | |
e9261fb6 | 4050 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
4051 | |
4052 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4053 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
4054 | |
4055 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4056 | { | |
4057 | return 0; | |
4058 | } | |
e9261fb6 | 4059 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
4060 | |
4061 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4062 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
4063 | |
4064 | int usb_disable_ltm(struct usb_device *udev) | |
4065 | { | |
4066 | return 0; | |
4067 | } | |
4068 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
4069 | ||
4070 | void usb_enable_ltm(struct usb_device *udev) { } | |
4071 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 | 4072 | |
4a95b1fc SR |
4073 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
4074 | u16 portstatus, u16 portchange) | |
4075 | { | |
4076 | return 0; | |
4077 | } | |
4078 | ||
c4b51a43 | 4079 | #endif /* CONFIG_PM */ |
d388dab7 | 4080 | |
1da177e4 LT |
4081 | |
4082 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
4083 | * | |
4084 | * Between connect detection and reset signaling there must be a delay | |
4085 | * of 100ms at least for debounce and power-settling. The corresponding | |
4086 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 4087 | * |
1da177e4 LT |
4088 | * Apparently there are some bluetooth and irda-dongles and a number of |
4089 | * low-speed devices for which this debounce period may last over a second. | |
4090 | * Not covered by the spec - but easy to deal with. | |
4091 | * | |
4092 | * This implementation uses a 1500ms total debounce timeout; if the | |
4093 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
4094 | * every 25ms for transient disconnects. When the port status has been | |
4095 | * unchanged for 100ms it returns the port status. | |
4096 | */ | |
ad493e5e | 4097 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
4098 | { |
4099 | int ret; | |
1da177e4 LT |
4100 | u16 portchange, portstatus; |
4101 | unsigned connection = 0xffff; | |
d99f6b41 DW |
4102 | int total_time, stable_time = 0; |
4103 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
1da177e4 LT |
4104 | |
4105 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
4106 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
4107 | if (ret < 0) | |
4108 | return ret; | |
4109 | ||
4110 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
4111 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
4112 | if (!must_be_connected || |
4113 | (connection == USB_PORT_STAT_CONNECTION)) | |
4114 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
4115 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
4116 | break; | |
4117 | } else { | |
4118 | stable_time = 0; | |
4119 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
4120 | } | |
4121 | ||
4122 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 4123 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
4124 | USB_PORT_FEAT_C_CONNECTION); |
4125 | } | |
4126 | ||
4127 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
4128 | break; | |
4129 | msleep(HUB_DEBOUNCE_STEP); | |
4130 | } | |
4131 | ||
d99f6b41 DW |
4132 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
4133 | total_time, stable_time, portstatus); | |
1da177e4 LT |
4134 | |
4135 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
4136 | return -ETIMEDOUT; | |
4137 | return portstatus; | |
4138 | } | |
4139 | ||
fc721f51 | 4140 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 4141 | { |
ddeac4e7 AS |
4142 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
4143 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 4144 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 4145 | } |
fc721f51 | 4146 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
4147 | |
4148 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
4149 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
4150 | ||
4326ed0b | 4151 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
4152 | { |
4153 | int retval; | |
c6515272 | 4154 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 4155 | |
c6515272 SS |
4156 | /* |
4157 | * The host controller will choose the device address, | |
4158 | * instead of the core having chosen it earlier | |
4159 | */ | |
4160 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
4161 | return -EINVAL; |
4162 | if (udev->state == USB_STATE_ADDRESS) | |
4163 | return 0; | |
4164 | if (udev->state != USB_STATE_DEFAULT) | |
4165 | return -EINVAL; | |
c8d4af8e | 4166 | if (hcd->driver->address_device) |
c6515272 | 4167 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 4168 | else |
c6515272 SS |
4169 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
4170 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
4171 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 4172 | if (retval == 0) { |
3b29b68b | 4173 | update_devnum(udev, devnum); |
4953d141 | 4174 | /* Device now using proper address. */ |
1da177e4 | 4175 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 4176 | usb_ep0_reinit(udev); |
1da177e4 LT |
4177 | } |
4178 | return retval; | |
4179 | } | |
4180 | ||
890dae88 MN |
4181 | /* |
4182 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
4183 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
4184 | * enabled. | |
4185 | * | |
4186 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
4187 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
4188 | * support bit in the BOS descriptor. | |
4189 | */ | |
4190 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
4191 | { | |
d99f6b41 DW |
4192 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
4193 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; | |
890dae88 MN |
4194 | |
4195 | if (!udev->usb2_hw_lpm_capable) | |
4196 | return; | |
4197 | ||
d99f6b41 DW |
4198 | if (hub) |
4199 | connect_type = hub->ports[udev->portnum - 1]->connect_type; | |
890dae88 | 4200 | |
23c05820 | 4201 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
4202 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
4203 | udev->usb2_hw_lpm_allowed = 1; | |
4204 | usb_set_usb2_hardware_lpm(udev, 1); | |
4205 | } | |
4206 | } | |
4207 | ||
48fc7dbd DW |
4208 | static int hub_enable_device(struct usb_device *udev) |
4209 | { | |
4210 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4211 | ||
4212 | if (!hcd->driver->enable_device) | |
4213 | return 0; | |
4214 | if (udev->state == USB_STATE_ADDRESS) | |
4215 | return 0; | |
4216 | if (udev->state != USB_STATE_DEFAULT) | |
4217 | return -EINVAL; | |
4218 | ||
4219 | return hcd->driver->enable_device(hcd, udev); | |
4220 | } | |
4221 | ||
1da177e4 LT |
4222 | /* Reset device, (re)assign address, get device descriptor. |
4223 | * Device connection must be stable, no more debouncing needed. | |
4224 | * Returns device in USB_STATE_ADDRESS, except on error. | |
4225 | * | |
4226 | * If this is called for an already-existing device (as part of | |
5c79a1e3 DW |
4227 | * usb_reset_and_verify_device), the caller must own the device lock and |
4228 | * the port lock. For a newly detected device that is not accessible | |
4229 | * through any global pointers, it's not necessary to lock the device, | |
4230 | * but it is still necessary to lock the port. | |
1da177e4 LT |
4231 | */ |
4232 | static int | |
4233 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
4234 | int retry_counter) | |
4235 | { | |
1da177e4 | 4236 | struct usb_device *hdev = hub->hdev; |
e7b77172 | 4237 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
4238 | int i, j, retval; |
4239 | unsigned delay = HUB_SHORT_RESET_TIME; | |
4240 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4241 | const char *speed; |
4326ed0b | 4242 | int devnum = udev->devnum; |
1da177e4 LT |
4243 | |
4244 | /* root hub ports have a slightly longer reset period | |
4245 | * (from USB 2.0 spec, section 7.1.7.5) | |
4246 | */ | |
4247 | if (!hdev->parent) { | |
4248 | delay = HUB_ROOT_RESET_TIME; | |
4249 | if (port1 == hdev->bus->otg_port) | |
4250 | hdev->bus->b_hnp_enable = 0; | |
4251 | } | |
4252 | ||
4253 | /* Some low speed devices have problems with the quick delay, so */ | |
4254 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4255 | if (oldspeed == USB_SPEED_LOW) | |
4256 | delay = HUB_LONG_RESET_TIME; | |
4257 | ||
6fecd4f2 | 4258 | mutex_lock(&hdev->bus->usb_address0_mutex); |
1da177e4 | 4259 | |
07194ab7 LT |
4260 | /* Reset the device; full speed may morph to high speed */ |
4261 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4262 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4263 | if (retval < 0) /* error or disconnect */ |
4264 | goto fail; | |
4265 | /* success, speed is known */ | |
4266 | ||
1da177e4 LT |
4267 | retval = -ENODEV; |
4268 | ||
4269 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
4270 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
4271 | goto fail; | |
4272 | } | |
4273 | oldspeed = udev->speed; | |
4326ed0b | 4274 | |
1da177e4 LT |
4275 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4276 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4277 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4278 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4279 | */ |
4280 | switch (udev->speed) { | |
6b403b02 | 4281 | case USB_SPEED_SUPER: |
551cdbbe | 4282 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4283 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4284 | break; |
1da177e4 | 4285 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4286 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4287 | break; |
4288 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4289 | /* to determine the ep0 maxpacket size, try to read | |
4290 | * the device descriptor to get bMaxPacketSize0 and | |
4291 | * then correct our initial guess. | |
4292 | */ | |
551509d2 | 4293 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4294 | break; |
4295 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4296 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4297 | break; |
4298 | default: | |
4299 | goto fail; | |
4300 | } | |
e538dfda MN |
4301 | |
4302 | if (udev->speed == USB_SPEED_WIRELESS) | |
4303 | speed = "variable speed Wireless"; | |
4304 | else | |
4305 | speed = usb_speed_string(udev->speed); | |
4306 | ||
c6515272 SS |
4307 | if (udev->speed != USB_SPEED_SUPER) |
4308 | dev_info(&udev->dev, | |
e538dfda MN |
4309 | "%s %s USB device number %d using %s\n", |
4310 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 4311 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
4312 | |
4313 | /* Set up TT records, if needed */ | |
4314 | if (hdev->tt) { | |
4315 | udev->tt = hdev->tt; | |
4316 | udev->ttport = hdev->ttport; | |
4317 | } else if (udev->speed != USB_SPEED_HIGH | |
4318 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4319 | if (!hub->tt.hub) { |
4320 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4321 | retval = -EINVAL; | |
4322 | goto fail; | |
4323 | } | |
1da177e4 LT |
4324 | udev->tt = &hub->tt; |
4325 | udev->ttport = port1; | |
4326 | } | |
469271f8 | 4327 | |
1da177e4 LT |
4328 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4329 | * Because device hardware and firmware is sometimes buggy in | |
4330 | * this area, and this is how Linux has done it for ages. | |
4331 | * Change it cautiously. | |
4332 | * | |
48fc7dbd | 4333 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4334 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4335 | * so it may help with some non-standards-compliant devices. | |
4336 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4337 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4338 | * value. | |
4339 | */ | |
4340 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
48fc7dbd DW |
4341 | bool did_new_scheme = false; |
4342 | ||
4343 | if (use_new_scheme(udev, retry_counter)) { | |
1da177e4 LT |
4344 | struct usb_device_descriptor *buf; |
4345 | int r = 0; | |
4346 | ||
48fc7dbd DW |
4347 | did_new_scheme = true; |
4348 | retval = hub_enable_device(udev); | |
938569eb ON |
4349 | if (retval < 0) { |
4350 | dev_err(&udev->dev, | |
4351 | "hub failed to enable device, error %d\n", | |
4352 | retval); | |
48fc7dbd | 4353 | goto fail; |
938569eb | 4354 | } |
48fc7dbd | 4355 | |
1da177e4 LT |
4356 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4357 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4358 | if (!buf) { | |
4359 | retval = -ENOMEM; | |
4360 | continue; | |
4361 | } | |
4362 | ||
b89ee19a AS |
4363 | /* Retry on all errors; some devices are flakey. |
4364 | * 255 is for WUSB devices, we actually need to use | |
4365 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
4366 | */ |
4367 | for (j = 0; j < 3; ++j) { | |
4368 | buf->bMaxPacketSize0 = 0; | |
4369 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4370 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4371 | USB_DT_DEVICE << 8, 0, | |
4372 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4373 | initial_descriptor_timeout); |
1da177e4 | 4374 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4375 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4376 | if (buf->bDescriptorType == |
4377 | USB_DT_DEVICE) { | |
4378 | r = 0; | |
4379 | break; | |
4380 | } | |
4381 | /* FALL THROUGH */ | |
4382 | default: | |
4383 | if (r == 0) | |
4384 | r = -EPROTO; | |
4385 | break; | |
4386 | } | |
4387 | if (r == 0) | |
4388 | break; | |
4389 | } | |
4390 | udev->descriptor.bMaxPacketSize0 = | |
4391 | buf->bMaxPacketSize0; | |
4392 | kfree(buf); | |
4393 | ||
75d7cf72 | 4394 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4395 | if (retval < 0) /* error or disconnect */ |
4396 | goto fail; | |
4397 | if (oldspeed != udev->speed) { | |
4398 | dev_dbg(&udev->dev, | |
4399 | "device reset changed speed!\n"); | |
4400 | retval = -ENODEV; | |
4401 | goto fail; | |
4402 | } | |
4403 | if (r) { | |
e9e88fb7 AS |
4404 | if (r != -ENODEV) |
4405 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4406 | r); | |
1da177e4 LT |
4407 | retval = -EMSGSIZE; |
4408 | continue; | |
4409 | } | |
4410 | #undef GET_DESCRIPTOR_BUFSIZE | |
4411 | } | |
4412 | ||
469271f8 MB |
4413 | /* |
4414 | * If device is WUSB, we already assigned an | |
4415 | * unauthorized address in the Connect Ack sequence; | |
4416 | * authorization will assign the final address. | |
4417 | */ | |
c6515272 | 4418 | if (udev->wusb == 0) { |
6c529cdc IPG |
4419 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
4420 | retval = hub_set_address(udev, devnum); | |
4421 | if (retval >= 0) | |
4422 | break; | |
4423 | msleep(200); | |
4424 | } | |
4425 | if (retval < 0) { | |
e9e88fb7 AS |
4426 | if (retval != -ENODEV) |
4427 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4428 | devnum, retval); | |
6c529cdc IPG |
4429 | goto fail; |
4430 | } | |
c6515272 SS |
4431 | if (udev->speed == USB_SPEED_SUPER) { |
4432 | devnum = udev->devnum; | |
4433 | dev_info(&udev->dev, | |
3b29b68b | 4434 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 4435 | (udev->config) ? "reset" : "new", |
3b29b68b | 4436 | devnum, udev->bus->controller->driver->name); |
c6515272 | 4437 | } |
6c529cdc IPG |
4438 | |
4439 | /* cope with hardware quirkiness: | |
4440 | * - let SET_ADDRESS settle, some device hardware wants it | |
4441 | * - read ep0 maxpacket even for high and low speed, | |
4442 | */ | |
4443 | msleep(10); | |
48fc7dbd DW |
4444 | /* use_new_scheme() checks the speed which may have |
4445 | * changed since the initial look so we cache the result | |
4446 | * in did_new_scheme | |
4447 | */ | |
4448 | if (did_new_scheme) | |
1da177e4 | 4449 | break; |
469271f8 | 4450 | } |
1da177e4 LT |
4451 | |
4452 | retval = usb_get_device_descriptor(udev, 8); | |
4453 | if (retval < 8) { | |
e9e88fb7 AS |
4454 | if (retval != -ENODEV) |
4455 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4456 | "device descriptor read/8, error %d\n", |
4457 | retval); | |
1da177e4 LT |
4458 | if (retval >= 0) |
4459 | retval = -EMSGSIZE; | |
4460 | } else { | |
4461 | retval = 0; | |
4462 | break; | |
4463 | } | |
4464 | } | |
4465 | if (retval) | |
4466 | goto fail; | |
4467 | ||
b76baa81 | 4468 | if (hcd->phy && !hdev->parent) |
ac96511b | 4469 | usb_phy_notify_connect(hcd->phy, udev->speed); |
b76baa81 | 4470 | |
d8aec3db EF |
4471 | /* |
4472 | * Some superspeed devices have finished the link training process | |
4473 | * and attached to a superspeed hub port, but the device descriptor | |
4474 | * got from those devices show they aren't superspeed devices. Warm | |
4475 | * reset the port attached by the devices can fix them. | |
4476 | */ | |
4477 | if ((udev->speed == USB_SPEED_SUPER) && | |
4478 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { | |
4479 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4480 | "warm reset device\n"); | |
4481 | hub_port_reset(hub, port1, udev, | |
4482 | HUB_BH_RESET_TIME, true); | |
4483 | retval = -EINVAL; | |
4484 | goto fail; | |
4485 | } | |
4486 | ||
6b403b02 SS |
4487 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
4488 | udev->speed == USB_SPEED_SUPER) | |
4489 | i = 512; | |
4490 | else | |
4491 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4492 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4493 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4494 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4495 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4496 | retval = -EMSGSIZE; |
4497 | goto fail; | |
4498 | } | |
56626a72 AS |
4499 | if (udev->speed == USB_SPEED_FULL) |
4500 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4501 | else | |
4502 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4503 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4504 | usb_ep0_reinit(udev); |
1da177e4 | 4505 | } |
469271f8 | 4506 | |
1da177e4 LT |
4507 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4508 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4509 | if (retval != -ENODEV) |
4510 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4511 | retval); | |
1da177e4 LT |
4512 | if (retval >= 0) |
4513 | retval = -ENOMSG; | |
4514 | goto fail; | |
4515 | } | |
4516 | ||
1ff4df56 AX |
4517 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4518 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4519 | if (!retval) { |
d9b2099c | 4520 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4521 | usb_set_lpm_parameters(udev); |
4522 | } | |
1ff4df56 | 4523 | } |
3148bf04 | 4524 | |
1da177e4 | 4525 | retval = 0; |
48f24970 AD |
4526 | /* notify HCD that we have a device connected and addressed */ |
4527 | if (hcd->driver->update_device) | |
4528 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4529 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4530 | fail: |
4326ed0b | 4531 | if (retval) { |
1da177e4 | 4532 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4533 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4534 | } |
6fecd4f2 | 4535 | mutex_unlock(&hdev->bus->usb_address0_mutex); |
1da177e4 LT |
4536 | return retval; |
4537 | } | |
4538 | ||
4539 | static void | |
4540 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
4541 | { | |
4542 | struct usb_qualifier_descriptor *qual; | |
4543 | int status; | |
4544 | ||
2a159389 JH |
4545 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
4546 | return; | |
4547 | ||
e94b1766 | 4548 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4549 | if (qual == NULL) |
4550 | return; | |
4551 | ||
4552 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
4553 | qual, sizeof *qual); | |
4554 | if (status == sizeof *qual) { | |
4555 | dev_info(&udev->dev, "not running at top speed; " | |
4556 | "connect to a high speed hub\n"); | |
4557 | /* hub LEDs are probably harder to miss than syslog */ | |
4558 | if (hub->has_indicators) { | |
4559 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4560 | queue_delayed_work(system_power_efficient_wq, |
4561 | &hub->leds, 0); | |
1da177e4 LT |
4562 | } |
4563 | } | |
1bc3c9e1 | 4564 | kfree(qual); |
1da177e4 LT |
4565 | } |
4566 | ||
4567 | static unsigned | |
4568 | hub_power_remaining (struct usb_hub *hub) | |
4569 | { | |
4570 | struct usb_device *hdev = hub->hdev; | |
4571 | int remaining; | |
55c52718 | 4572 | int port1; |
1da177e4 | 4573 | |
55c52718 | 4574 | if (!hub->limited_power) |
1da177e4 LT |
4575 | return 0; |
4576 | ||
55c52718 AS |
4577 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4578 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
4579 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4580 | struct usb_device *udev = port_dev->child; | |
4581 | unsigned unit_load; | |
4582 | int delta; | |
1da177e4 LT |
4583 | |
4584 | if (!udev) | |
4585 | continue; | |
430ee58e SAS |
4586 | if (hub_is_superspeed(udev)) |
4587 | unit_load = 150; | |
4588 | else | |
4589 | unit_load = 100; | |
1da177e4 | 4590 | |
430ee58e SAS |
4591 | /* |
4592 | * Unconfigured devices may not use more than one unit load, | |
4593 | * or 8mA for OTG ports | |
4594 | */ | |
1da177e4 | 4595 | if (udev->actconfig) |
8d8479db | 4596 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4597 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4598 | delta = unit_load; |
1da177e4 | 4599 | else |
55c52718 AS |
4600 | delta = 8; |
4601 | if (delta > hub->mA_per_port) | |
d99f6b41 DW |
4602 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
4603 | delta, hub->mA_per_port); | |
1da177e4 LT |
4604 | remaining -= delta; |
4605 | } | |
4606 | if (remaining < 0) { | |
55c52718 | 4607 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4608 | -remaining); |
1da177e4 LT |
4609 | remaining = 0; |
4610 | } | |
4611 | return remaining; | |
4612 | } | |
4613 | ||
af376a46 DW |
4614 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
4615 | u16 portchange) | |
1da177e4 | 4616 | { |
1da177e4 | 4617 | int status, i; |
430ee58e | 4618 | unsigned unit_load; |
1da177e4 | 4619 | struct usb_device *hdev = hub->hdev; |
90da096e | 4620 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
d99f6b41 | 4621 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
af376a46 | 4622 | struct usb_device *udev = port_dev->child; |
5ee0f803 | 4623 | static int unreliable_port = -1; |
8808f00c | 4624 | |
24618b0c | 4625 | /* Disconnect any existing devices under this port */ |
b76baa81 PC |
4626 | if (udev) { |
4627 | if (hcd->phy && !hdev->parent && | |
4628 | !(portstatus & USB_PORT_STAT_CONNECTION)) | |
ac96511b | 4629 | usb_phy_notify_disconnect(hcd->phy, udev->speed); |
d99f6b41 | 4630 | usb_disconnect(&port_dev->child); |
b76baa81 | 4631 | } |
24618b0c | 4632 | |
253e0572 AS |
4633 | /* We can forget about a "removed" device when there's a physical |
4634 | * disconnect or the connect status changes. | |
4635 | */ | |
4636 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4637 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4638 | clear_bit(port1, hub->removed_bits); | |
4639 | ||
5257d97a AS |
4640 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4641 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4642 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4643 | if (status < 0) { |
5ee0f803 ON |
4644 | if (status != -ENODEV && |
4645 | port1 != unreliable_port && | |
4646 | printk_ratelimit()) | |
dd5f5006 | 4647 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
5257d97a | 4648 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
5ee0f803 | 4649 | unreliable_port = port1; |
5257d97a AS |
4650 | } else { |
4651 | portstatus = status; | |
4652 | } | |
4653 | } | |
4654 | ||
253e0572 AS |
4655 | /* Return now if debouncing failed or nothing is connected or |
4656 | * the device was "removed". | |
4657 | */ | |
4658 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4659 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
4660 | |
4661 | /* maybe switch power back on (e.g. root hub was reset) */ | |
9262c19d | 4662 | if (hub_is_port_power_switchable(hub) |
0ed9a57e | 4663 | && !port_is_power_on(hub, portstatus)) |
1da177e4 | 4664 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4665 | |
1da177e4 | 4666 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4667 | goto done; |
1da177e4 LT |
4668 | return; |
4669 | } | |
430ee58e SAS |
4670 | if (hub_is_superspeed(hub->hdev)) |
4671 | unit_load = 150; | |
4672 | else | |
4673 | unit_load = 100; | |
1da177e4 | 4674 | |
e9e88fb7 | 4675 | status = 0; |
1da177e4 | 4676 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4677 | |
4678 | /* reallocate for each attempt, since references | |
4679 | * to the previous one can escape in various ways | |
4680 | */ | |
4681 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4682 | if (!udev) { | |
d99f6b41 DW |
4683 | dev_err(&port_dev->dev, |
4684 | "couldn't allocate usb_device\n"); | |
1da177e4 LT |
4685 | goto done; |
4686 | } | |
4687 | ||
4688 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4689 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4690 | udev->level = hdev->level + 1; |
8af548dc | 4691 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4692 | |
131dec34 SS |
4693 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
4694 | if (hub_is_superspeed(hub->hdev)) | |
e7b77172 SS |
4695 | udev->speed = USB_SPEED_SUPER; |
4696 | else | |
4697 | udev->speed = USB_SPEED_UNKNOWN; | |
4698 | ||
3b29b68b | 4699 | choose_devnum(udev); |
c8d4af8e AX |
4700 | if (udev->devnum <= 0) { |
4701 | status = -ENOTCONN; /* Don't retry */ | |
4702 | goto loop; | |
c6515272 SS |
4703 | } |
4704 | ||
e7b77172 | 4705 | /* reset (non-USB 3.0 devices) and get descriptor */ |
5c79a1e3 | 4706 | usb_lock_port(port_dev); |
1da177e4 | 4707 | status = hub_port_init(hub, udev, port1, i); |
5c79a1e3 | 4708 | usb_unlock_port(port_dev); |
1da177e4 LT |
4709 | if (status < 0) |
4710 | goto loop; | |
4711 | ||
93362a87 PD |
4712 | usb_detect_quirks(udev); |
4713 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
4714 | msleep(1000); | |
4715 | ||
1da177e4 LT |
4716 | /* consecutive bus-powered hubs aren't reliable; they can |
4717 | * violate the voltage drop budget. if the new child has | |
4718 | * a "powered" LED, users should notice we didn't enable it | |
4719 | * (without reading syslog), even without per-port LEDs | |
4720 | * on the parent. | |
4721 | */ | |
4722 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4723 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4724 | u16 devstat; |
4725 | ||
4726 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
4727 | &devstat); | |
15b7336e | 4728 | if (status) { |
1da177e4 LT |
4729 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4730 | goto loop_disable; | |
4731 | } | |
1da177e4 LT |
4732 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4733 | dev_err(&udev->dev, | |
4734 | "can't connect bus-powered hub " | |
4735 | "to this port\n"); | |
4736 | if (hub->has_indicators) { | |
4737 | hub->indicator[port1-1] = | |
4738 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
4739 | queue_delayed_work( |
4740 | system_power_efficient_wq, | |
4741 | &hub->leds, 0); | |
1da177e4 LT |
4742 | } |
4743 | status = -ENOTCONN; /* Don't retry */ | |
4744 | goto loop_disable; | |
4745 | } | |
4746 | } | |
469271f8 | 4747 | |
1da177e4 LT |
4748 | /* check for devices running slower than they could */ |
4749 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4750 | && udev->speed == USB_SPEED_FULL | |
4751 | && highspeed_hubs != 0) | |
4752 | check_highspeed (hub, udev, port1); | |
4753 | ||
fa286188 | 4754 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4755 | * udev becomes globally accessible, although presumably |
4756 | * no one will look at it until hdev is unlocked. | |
4757 | */ | |
1da177e4 LT |
4758 | status = 0; |
4759 | ||
d8521afe DW |
4760 | mutex_lock(&usb_port_peer_mutex); |
4761 | ||
1da177e4 LT |
4762 | /* We mustn't add new devices if the parent hub has |
4763 | * been disconnected; we would race with the | |
4764 | * recursively_mark_NOTATTACHED() routine. | |
4765 | */ | |
4766 | spin_lock_irq(&device_state_lock); | |
4767 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4768 | status = -ENOTCONN; | |
4769 | else | |
d99f6b41 | 4770 | port_dev->child = udev; |
1da177e4 | 4771 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4772 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4773 | |
4774 | /* Run it through the hoops (find a driver, etc) */ | |
4775 | if (!status) { | |
4776 | status = usb_new_device(udev); | |
4777 | if (status) { | |
d8521afe | 4778 | mutex_lock(&usb_port_peer_mutex); |
1da177e4 | 4779 | spin_lock_irq(&device_state_lock); |
d99f6b41 | 4780 | port_dev->child = NULL; |
1da177e4 | 4781 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4782 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4783 | } |
4784 | } | |
4785 | ||
1da177e4 LT |
4786 | if (status) |
4787 | goto loop_disable; | |
4788 | ||
4789 | status = hub_power_remaining(hub); | |
4790 | if (status) | |
d99f6b41 | 4791 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
1da177e4 LT |
4792 | |
4793 | return; | |
4794 | ||
4795 | loop_disable: | |
4796 | hub_port_disable(hub, port1, 1); | |
4797 | loop: | |
fc721f51 | 4798 | usb_ep0_reinit(udev); |
3b29b68b | 4799 | release_devnum(udev); |
f7410ced | 4800 | hub_free_dev(udev); |
1da177e4 | 4801 | usb_put_dev(udev); |
ffcdc18d | 4802 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
4803 | break; |
4804 | } | |
3a31155c AS |
4805 | if (hub->hdev->parent || |
4806 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4807 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4808 | if (status != -ENOTCONN && status != -ENODEV) | |
d99f6b41 DW |
4809 | dev_err(&port_dev->dev, |
4810 | "unable to enumerate USB device\n"); | |
e9e88fb7 | 4811 | } |
469271f8 | 4812 | |
1da177e4 LT |
4813 | done: |
4814 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
4815 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
4816 | hcd->driver->relinquish_port(hcd, port1); | |
af376a46 | 4817 | |
1da177e4 LT |
4818 | } |
4819 | ||
af376a46 DW |
4820 | /* Handle physical or logical connection change events. |
4821 | * This routine is called when: | |
4822 | * a port connection-change occurs; | |
4823 | * a port enable-change occurs (often caused by EMI); | |
4824 | * usb_reset_and_verify_device() encounters changed descriptors (as from | |
4825 | * a firmware download) | |
4826 | * caller already locked the hub | |
4827 | */ | |
4828 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4829 | u16 portstatus, u16 portchange) | |
5c79a1e3 | 4830 | __must_hold(&port_dev->status_lock) |
714b07be | 4831 | { |
af376a46 DW |
4832 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4833 | struct usb_device *udev = port_dev->child; | |
4834 | int status = -ENODEV; | |
714b07be | 4835 | |
af376a46 DW |
4836 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
4837 | portchange, portspeed(hub, portstatus)); | |
4838 | ||
4839 | if (hub->has_indicators) { | |
4840 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4841 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4ee823b8 SS |
4842 | } |
4843 | ||
af376a46 DW |
4844 | #ifdef CONFIG_USB_OTG |
4845 | /* during HNP, don't repeat the debounce */ | |
4846 | if (hub->hdev->bus->is_b_host) | |
4847 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | | |
4848 | USB_PORT_STAT_C_ENABLE); | |
4849 | #endif | |
4850 | ||
4851 | /* Try to resuscitate an existing device */ | |
4852 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
4853 | udev->state != USB_STATE_NOTATTACHED) { | |
4854 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
4855 | status = 0; /* Nothing to do */ | |
4856 | #ifdef CONFIG_PM_RUNTIME | |
4857 | } else if (udev->state == USB_STATE_SUSPENDED && | |
4858 | udev->persist_enabled) { | |
4859 | /* For a suspended device, treat this as a | |
4860 | * remote wakeup event. | |
4861 | */ | |
5c79a1e3 | 4862 | usb_unlock_port(port_dev); |
af376a46 | 4863 | status = usb_remote_wakeup(udev); |
5c79a1e3 | 4864 | usb_lock_port(port_dev); |
af376a46 DW |
4865 | #endif |
4866 | } else { | |
4867 | /* Don't resuscitate */; | |
4868 | } | |
af376a46 DW |
4869 | } |
4870 | clear_bit(port1, hub->change_bits); | |
4871 | ||
5c79a1e3 | 4872 | /* successfully revalidated the connection */ |
af376a46 DW |
4873 | if (status == 0) |
4874 | return; | |
4875 | ||
5c79a1e3 | 4876 | usb_unlock_port(port_dev); |
af376a46 | 4877 | hub_port_connect(hub, port1, portstatus, portchange); |
5c79a1e3 | 4878 | usb_lock_port(port_dev); |
1da177e4 LT |
4879 | } |
4880 | ||
af376a46 | 4881 | static void port_event(struct usb_hub *hub, int port1) |
5c79a1e3 | 4882 | __must_hold(&port_dev->status_lock) |
af376a46 DW |
4883 | { |
4884 | int connect_change, reset_device = 0; | |
4885 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
4886 | struct usb_device *udev = port_dev->child; | |
4887 | struct usb_device *hdev = hub->hdev; | |
4888 | u16 portstatus, portchange; | |
4889 | ||
4890 | connect_change = test_bit(port1, hub->change_bits); | |
4891 | clear_bit(port1, hub->event_bits); | |
4892 | clear_bit(port1, hub->wakeup_bits); | |
4893 | ||
4894 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) | |
4895 | return; | |
4896 | ||
4897 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
4898 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); | |
4899 | connect_change = 1; | |
4900 | } | |
4901 | ||
4902 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
4903 | if (!connect_change) | |
4904 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", | |
4905 | portstatus); | |
4906 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
4907 | ||
4908 | /* | |
4909 | * EM interference sometimes causes badly shielded USB devices | |
4910 | * to be shutdown by the hub, this hack enables them again. | |
4911 | * Works at least with mouse driver. | |
4912 | */ | |
4913 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
4914 | && !connect_change && udev) { | |
4915 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); | |
4916 | connect_change = 1; | |
4917 | } | |
4918 | } | |
4919 | ||
4920 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
4921 | u16 status = 0, unused; | |
4922 | ||
4923 | dev_dbg(&port_dev->dev, "over-current change\n"); | |
4924 | usb_clear_port_feature(hdev, port1, | |
4925 | USB_PORT_FEAT_C_OVER_CURRENT); | |
4926 | msleep(100); /* Cool down */ | |
4927 | hub_power_on(hub, true); | |
4928 | hub_port_status(hub, port1, &status, &unused); | |
4929 | if (status & USB_PORT_STAT_OVERCURRENT) | |
4930 | dev_err(&port_dev->dev, "over-current condition\n"); | |
4931 | } | |
4932 | ||
4933 | if (portchange & USB_PORT_STAT_C_RESET) { | |
4934 | dev_dbg(&port_dev->dev, "reset change\n"); | |
4935 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); | |
4936 | } | |
4937 | if ((portchange & USB_PORT_STAT_C_BH_RESET) | |
4938 | && hub_is_superspeed(hdev)) { | |
4939 | dev_dbg(&port_dev->dev, "warm reset change\n"); | |
4940 | usb_clear_port_feature(hdev, port1, | |
4941 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
4942 | } | |
4943 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { | |
4944 | dev_dbg(&port_dev->dev, "link state change\n"); | |
4945 | usb_clear_port_feature(hdev, port1, | |
4946 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
4947 | } | |
4948 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
4949 | dev_warn(&port_dev->dev, "config error\n"); | |
4950 | usb_clear_port_feature(hdev, port1, | |
4951 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
4952 | } | |
4953 | ||
097a155f DW |
4954 | /* skip port actions that require the port to be powered on */ |
4955 | if (!pm_runtime_active(&port_dev->dev)) | |
4956 | return; | |
714b07be | 4957 | |
af376a46 DW |
4958 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
4959 | connect_change = 1; | |
4960 | ||
4961 | /* | |
4962 | * Warm reset a USB3 protocol port if it's in | |
4963 | * SS.Inactive state. | |
4964 | */ | |
3cd12f91 | 4965 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
af376a46 DW |
4966 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
4967 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) | |
4968 | || udev->state == USB_STATE_NOTATTACHED) { | |
4969 | if (hub_port_reset(hub, port1, NULL, | |
4970 | HUB_BH_RESET_TIME, true) < 0) | |
4971 | hub_port_disable(hub, port1, 1); | |
4972 | } else | |
4973 | reset_device = 1; | |
4974 | } | |
4975 | ||
4976 | /* | |
4977 | * On disconnect USB3 protocol ports transit from U0 to | |
4978 | * SS.Inactive to Rx.Detect. If this happens a warm- | |
4979 | * reset is not needed, but a (re)connect may happen | |
4980 | * before khubd runs and sees the disconnect, and the | |
4981 | * device may be an unknown state. | |
4982 | * | |
4983 | * If the port went through SS.Inactive without khubd | |
4984 | * seeing it the C_LINK_STATE change flag will be set, | |
4985 | * and we reset the dev to put it in a known state. | |
4986 | */ | |
4987 | if (reset_device || (udev && hub_is_superspeed(hub->hdev) | |
4988 | && (portchange & USB_PORT_STAT_C_LINK_STATE) | |
4989 | && (portstatus & USB_PORT_STAT_CONNECTION))) { | |
5c79a1e3 | 4990 | usb_unlock_port(port_dev); |
714b07be | 4991 | usb_lock_device(udev); |
af376a46 | 4992 | usb_reset_device(udev); |
714b07be | 4993 | usb_unlock_device(udev); |
5c79a1e3 | 4994 | usb_lock_port(port_dev); |
af376a46 | 4995 | connect_change = 0; |
714b07be | 4996 | } |
af376a46 DW |
4997 | |
4998 | if (connect_change) | |
4999 | hub_port_connect_change(hub, port1, portstatus, portchange); | |
714b07be SS |
5000 | } |
5001 | ||
32a69589 | 5002 | static void hub_event(struct work_struct *work) |
1da177e4 | 5003 | { |
1da177e4 LT |
5004 | struct usb_device *hdev; |
5005 | struct usb_interface *intf; | |
5006 | struct usb_hub *hub; | |
5007 | struct device *hub_dev; | |
5008 | u16 hubstatus; | |
5009 | u16 hubchange; | |
1da177e4 | 5010 | int i, ret; |
1da177e4 | 5011 | |
32a69589 | 5012 | hub = container_of(work, struct usb_hub, events); |
eb6e2924 PM |
5013 | hdev = hub->hdev; |
5014 | hub_dev = hub->intfdev; | |
5015 | intf = to_usb_interface(hub_dev); | |
32a69589 | 5016 | |
eb6e2924 PM |
5017 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
5018 | hdev->state, hdev->maxchild, | |
5019 | /* NOTE: expects max 15 ports... */ | |
5020 | (u16) hub->change_bits[0], | |
5021 | (u16) hub->event_bits[0]); | |
5022 | ||
5023 | /* Lock the device, then check to see if we were | |
5024 | * disconnected while waiting for the lock to succeed. */ | |
5025 | usb_lock_device(hdev); | |
5026 | if (unlikely(hub->disconnected)) | |
32a69589 | 5027 | goto out_hdev_lock; |
eb6e2924 PM |
5028 | |
5029 | /* If the hub has died, clean up after it */ | |
5030 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
5031 | hub->error = -ENODEV; | |
5032 | hub_quiesce(hub, HUB_DISCONNECT); | |
32a69589 | 5033 | goto out_hdev_lock; |
eb6e2924 PM |
5034 | } |
5035 | ||
5036 | /* Autoresume */ | |
5037 | ret = usb_autopm_get_interface(intf); | |
5038 | if (ret) { | |
5039 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
32a69589 | 5040 | goto out_hdev_lock; |
eb6e2924 | 5041 | } |
1da177e4 | 5042 | |
eb6e2924 PM |
5043 | /* If this is an inactive hub, do nothing */ |
5044 | if (hub->quiescing) | |
5045 | goto out_autopm; | |
1da177e4 | 5046 | |
eb6e2924 PM |
5047 | if (hub->error) { |
5048 | dev_dbg(hub_dev, "resetting for error %d\n", hub->error); | |
5049 | ||
5050 | ret = usb_reset_device(hdev); | |
40f122f3 | 5051 | if (ret) { |
eb6e2924 PM |
5052 | dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
5053 | goto out_autopm; | |
40f122f3 | 5054 | } |
a8e7c565 | 5055 | |
eb6e2924 PM |
5056 | hub->nerrors = 0; |
5057 | hub->error = 0; | |
5058 | } | |
1da177e4 | 5059 | |
eb6e2924 PM |
5060 | /* deal with port status changes */ |
5061 | for (i = 1; i <= hdev->maxchild; i++) { | |
5062 | struct usb_port *port_dev = hub->ports[i - 1]; | |
1da177e4 | 5063 | |
eb6e2924 PM |
5064 | if (test_bit(i, hub->event_bits) |
5065 | || test_bit(i, hub->change_bits) | |
5066 | || test_bit(i, hub->wakeup_bits)) { | |
5067 | /* | |
5068 | * The get_noresume and barrier ensure that if | |
5069 | * the port was in the process of resuming, we | |
5070 | * flush that work and keep the port active for | |
5071 | * the duration of the port_event(). However, | |
5072 | * if the port is runtime pm suspended | |
5073 | * (powered-off), we leave it in that state, run | |
5074 | * an abbreviated port_event(), and move on. | |
5075 | */ | |
5076 | pm_runtime_get_noresume(&port_dev->dev); | |
5077 | pm_runtime_barrier(&port_dev->dev); | |
5078 | usb_lock_port(port_dev); | |
5079 | port_event(hub, i); | |
5080 | usb_unlock_port(port_dev); | |
5081 | pm_runtime_put_sync(&port_dev->dev); | |
1da177e4 | 5082 | } |
eb6e2924 | 5083 | } |
1da177e4 | 5084 | |
eb6e2924 PM |
5085 | /* deal with hub status changes */ |
5086 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
5087 | ; /* do nothing */ | |
5088 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
5089 | dev_err(hub_dev, "get_hub_status failed\n"); | |
5090 | else { | |
5091 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
5092 | dev_dbg(hub_dev, "power change\n"); | |
5093 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
5094 | if (hubstatus & HUB_STATUS_LOCAL_POWER) | |
5095 | /* FIXME: Is this always true? */ | |
5096 | hub->limited_power = 1; | |
5097 | else | |
5098 | hub->limited_power = 0; | |
af376a46 | 5099 | } |
eb6e2924 PM |
5100 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
5101 | u16 status = 0; | |
5102 | u16 unused; | |
1da177e4 | 5103 | |
eb6e2924 PM |
5104 | dev_dbg(hub_dev, "over-current change\n"); |
5105 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
5106 | msleep(500); /* Cool down */ | |
5107 | hub_power_on(hub, true); | |
5108 | hub_hub_status(hub, &status, &unused); | |
5109 | if (status & HUB_STATUS_OVERCURRENT) | |
5110 | dev_err(hub_dev, "over-current condition\n"); | |
1da177e4 | 5111 | } |
eb6e2924 | 5112 | } |
1da177e4 | 5113 | |
eb6e2924 PM |
5114 | out_autopm: |
5115 | /* Balance the usb_autopm_get_interface() above */ | |
5116 | usb_autopm_put_interface_no_suspend(intf); | |
32a69589 | 5117 | out_hdev_lock: |
eb6e2924 | 5118 | usb_unlock_device(hdev); |
1da177e4 | 5119 | |
32a69589 PM |
5120 | /* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
5121 | usb_autopm_put_interface(intf); | |
5122 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
5123 | } |
5124 | ||
1e927d96 | 5125 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 5126 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 5127 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
5128 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
5129 | .bInterfaceClass = USB_CLASS_HUB, | |
5130 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
5131 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
5132 | .bDeviceClass = USB_CLASS_HUB}, | |
5133 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
5134 | .bInterfaceClass = USB_CLASS_HUB}, | |
5135 | { } /* Terminating entry */ | |
5136 | }; | |
5137 | ||
5138 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
5139 | ||
5140 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
5141 | .name = "hub", |
5142 | .probe = hub_probe, | |
5143 | .disconnect = hub_disconnect, | |
5144 | .suspend = hub_suspend, | |
5145 | .resume = hub_resume, | |
f07600cf | 5146 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
5147 | .pre_reset = hub_pre_reset, |
5148 | .post_reset = hub_post_reset, | |
c532b29a | 5149 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 5150 | .id_table = hub_id_table, |
40f122f3 | 5151 | .supports_autosuspend = 1, |
1da177e4 LT |
5152 | }; |
5153 | ||
5154 | int usb_hub_init(void) | |
5155 | { | |
1da177e4 LT |
5156 | if (usb_register(&hub_driver) < 0) { |
5157 | printk(KERN_ERR "%s: can't register hub driver\n", | |
5158 | usbcore_name); | |
5159 | return -1; | |
5160 | } | |
5161 | ||
32a69589 PM |
5162 | /* |
5163 | * The workqueue needs to be freezable to avoid interfering with | |
5164 | * USB-PERSIST port handover. Otherwise it might see that a full-speed | |
5165 | * device was gone before the EHCI controller had handed its port | |
5166 | * over to the companion full-speed controller. | |
5167 | * | |
5168 | * Also we use ordered workqueue because the code is not ready | |
5169 | * for parallel execution of hub events, see choose_devnum(). | |
5170 | */ | |
5171 | hub_wq = alloc_ordered_workqueue("usb_hub_wq", WQ_FREEZABLE); | |
5172 | if (hub_wq) | |
1da177e4 | 5173 | return 0; |
1da177e4 LT |
5174 | |
5175 | /* Fall through if kernel_thread failed */ | |
5176 | usb_deregister(&hub_driver); | |
32a69589 | 5177 | pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
1da177e4 LT |
5178 | |
5179 | return -1; | |
5180 | } | |
5181 | ||
5182 | void usb_hub_cleanup(void) | |
5183 | { | |
32a69589 | 5184 | destroy_workqueue(hub_wq); |
1da177e4 LT |
5185 | |
5186 | /* | |
5187 | * Hub resources are freed for us by usb_deregister. It calls | |
5188 | * usb_driver_purge on every device which in turn calls that | |
5189 | * devices disconnect function if it is using this driver. | |
5190 | * The hub_disconnect function takes care of releasing the | |
5191 | * individual hub resources. -greg | |
5192 | */ | |
5193 | usb_deregister(&hub_driver); | |
5194 | } /* usb_hub_cleanup() */ | |
5195 | ||
eb764c4b | 5196 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5197 | struct usb_device_descriptor *old_device_descriptor, |
5198 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5199 | { |
5200 | int changed = 0; | |
5201 | unsigned index; | |
5202 | unsigned serial_len = 0; | |
5203 | unsigned len; | |
5204 | unsigned old_length; | |
5205 | int length; | |
5206 | char *buf; | |
5207 | ||
5208 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5209 | sizeof(*old_device_descriptor)) != 0) | |
5210 | return 1; | |
5211 | ||
e3376d6c XR |
5212 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5213 | return 1; | |
5214 | if (udev->bos) { | |
b9a10481 XR |
5215 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5216 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5217 | return 1; |
b9a10481 | 5218 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5219 | return 1; |
5220 | } | |
5221 | ||
eb764c4b AS |
5222 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5223 | * device descriptor haven't changed, we will assume the | |
5224 | * Manufacturer and Product strings haven't changed either. | |
5225 | * But the SerialNumber string could be different (e.g., a | |
5226 | * different flash card of the same brand). | |
5227 | */ | |
5228 | if (udev->serial) | |
5229 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5230 | |
eb764c4b | 5231 | len = serial_len; |
1da177e4 | 5232 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5233 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5234 | len = max(len, old_length); | |
1da177e4 | 5235 | } |
eb764c4b | 5236 | |
0cc1a51f | 5237 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
5238 | if (buf == NULL) { |
5239 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
5240 | /* assume the worst */ | |
5241 | return 1; | |
5242 | } | |
5243 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 5244 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5245 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5246 | old_length); | |
eb764c4b | 5247 | if (length != old_length) { |
1da177e4 LT |
5248 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5249 | index, length); | |
eb764c4b | 5250 | changed = 1; |
1da177e4 LT |
5251 | break; |
5252 | } | |
5253 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
5254 | != 0) { | |
5255 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5256 | index, |
5257 | ((struct usb_config_descriptor *) buf)-> | |
5258 | bConfigurationValue); | |
5259 | changed = 1; | |
1da177e4 LT |
5260 | break; |
5261 | } | |
5262 | } | |
eb764c4b AS |
5263 | |
5264 | if (!changed && serial_len) { | |
5265 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5266 | buf, serial_len); | |
5267 | if (length + 1 != serial_len) { | |
5268 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5269 | length); | |
5270 | changed = 1; | |
5271 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5272 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5273 | changed = 1; | |
5274 | } | |
5275 | } | |
5276 | ||
1da177e4 | 5277 | kfree(buf); |
eb764c4b | 5278 | return changed; |
1da177e4 LT |
5279 | } |
5280 | ||
5281 | /** | |
742120c6 | 5282 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5283 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5284 | * | |
79efa097 AS |
5285 | * WARNING - don't use this routine to reset a composite device |
5286 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5287 | * Use usb_reset_device() instead. |
1da177e4 LT |
5288 | * |
5289 | * Do a port reset, reassign the device's address, and establish its | |
5290 | * former operating configuration. If the reset fails, or the device's | |
5291 | * descriptors change from their values before the reset, or the original | |
5292 | * configuration and altsettings cannot be restored, a flag will be set | |
5293 | * telling khubd to pretend the device has been disconnected and then | |
5294 | * re-connected. All drivers will be unbound, and the device will be | |
5295 | * re-enumerated and probed all over again. | |
5296 | * | |
626f090c | 5297 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5298 | * flagged for logical disconnection, or some other negative error code |
5299 | * if the reset wasn't even attempted. | |
5300 | * | |
626f090c | 5301 | * Note: |
5c79a1e3 DW |
5302 | * The caller must own the device lock and the port lock, the latter is |
5303 | * taken by usb_reset_device(). For example, it's safe to use | |
5304 | * usb_reset_device() from a driver probe() routine after downloading | |
5305 | * new firmware. For calls that might not occur during probe(), drivers | |
5306 | * should lock the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5307 | * |
5308 | * Locking exception: This routine may also be called from within an | |
5309 | * autoresume handler. Such usage won't conflict with other tasks | |
5310 | * holding the device lock because these tasks should always call | |
5c79a1e3 DW |
5311 | * usb_autopm_resume_device(), thereby preventing any unwanted |
5312 | * autoresume. The autoresume handler is expected to have already | |
5313 | * acquired the port lock before calling this routine. | |
1da177e4 | 5314 | */ |
742120c6 | 5315 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5316 | { |
5317 | struct usb_device *parent_hdev = udev->parent; | |
5318 | struct usb_hub *parent_hub; | |
3f0479e0 | 5319 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5320 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5321 | struct usb_host_bos *bos; |
7a7b562d | 5322 | int i, j, ret = 0; |
12c3da34 | 5323 | int port1 = udev->portnum; |
1da177e4 LT |
5324 | |
5325 | if (udev->state == USB_STATE_NOTATTACHED || | |
5326 | udev->state == USB_STATE_SUSPENDED) { | |
5327 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5328 | udev->state); | |
5329 | return -EINVAL; | |
5330 | } | |
5331 | ||
5c79a1e3 | 5332 | if (!parent_hdev) |
1da177e4 | 5333 | return -EISDIR; |
5c79a1e3 | 5334 | |
ad493e5e | 5335 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5336 | |
dcc01c08 SS |
5337 | /* Disable USB2 hardware LPM. |
5338 | * It will be re-enabled by the enumeration process. | |
5339 | */ | |
5340 | if (udev->usb2_hw_lpm_enabled == 1) | |
5341 | usb_set_usb2_hardware_lpm(udev, 0); | |
5342 | ||
e3376d6c XR |
5343 | bos = udev->bos; |
5344 | udev->bos = NULL; | |
5345 | ||
f74631e3 SS |
5346 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5347 | * settings. Device-initiated LPM settings, and system exit latency | |
5348 | * settings are cleared when the device is reset, so we have to set | |
5349 | * them up again. | |
6d1d0513 SS |
5350 | */ |
5351 | ret = usb_unlocked_disable_lpm(udev); | |
5352 | if (ret) { | |
5353 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
5354 | goto re_enumerate; | |
5355 | } | |
f74631e3 SS |
5356 | ret = usb_disable_ltm(udev); |
5357 | if (ret) { | |
5358 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5359 | __func__); | |
5360 | goto re_enumerate; | |
5361 | } | |
6d1d0513 | 5362 | |
1da177e4 LT |
5363 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
5364 | ||
5365 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5366 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5367 | usb_ep0_reinit(udev); |
1da177e4 | 5368 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5369 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5370 | break; |
5371 | } | |
d5cbad4b | 5372 | |
1da177e4 LT |
5373 | if (ret < 0) |
5374 | goto re_enumerate; | |
469271f8 | 5375 | |
1da177e4 | 5376 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5377 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5378 | dev_info(&udev->dev, "device firmware changed\n"); |
5379 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5380 | goto re_enumerate; | |
469271f8 | 5381 | } |
4fe0387a AS |
5382 | |
5383 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5384 | if (!udev->actconfig) |
5385 | goto done; | |
3f0479e0 | 5386 | |
d673bfcb | 5387 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5388 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5389 | if (ret < 0) { | |
5390 | dev_warn(&udev->dev, | |
5391 | "Busted HC? Not enough HCD resources for " | |
5392 | "old configuration.\n"); | |
d673bfcb | 5393 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5394 | goto re_enumerate; |
5395 | } | |
1da177e4 LT |
5396 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5397 | USB_REQ_SET_CONFIGURATION, 0, | |
5398 | udev->actconfig->desc.bConfigurationValue, 0, | |
5399 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5400 | if (ret < 0) { | |
5401 | dev_err(&udev->dev, | |
5402 | "can't restore configuration #%d (error=%d)\n", | |
5403 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5404 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5405 | goto re_enumerate; |
469271f8 | 5406 | } |
d673bfcb | 5407 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5408 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5409 | ||
4fe0387a AS |
5410 | /* Put interfaces back into the same altsettings as before. |
5411 | * Don't bother to send the Set-Interface request for interfaces | |
5412 | * that were already in altsetting 0; besides being unnecessary, | |
5413 | * many devices can't handle it. Instead just reset the host-side | |
5414 | * endpoint state. | |
5415 | */ | |
1da177e4 | 5416 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5417 | struct usb_host_config *config = udev->actconfig; |
5418 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5419 | struct usb_interface_descriptor *desc; |
5420 | ||
1da177e4 | 5421 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5422 | if (desc->bAlternateSetting == 0) { |
5423 | usb_disable_interface(udev, intf, true); | |
5424 | usb_enable_interface(udev, intf, true); | |
5425 | ret = 0; | |
5426 | } else { | |
04a723ea SS |
5427 | /* Let the bandwidth allocation function know that this |
5428 | * device has been reset, and it will have to use | |
5429 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5430 | */ |
04a723ea | 5431 | intf->resetting_device = 1; |
4fe0387a AS |
5432 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5433 | desc->bAlternateSetting); | |
04a723ea | 5434 | intf->resetting_device = 0; |
4fe0387a | 5435 | } |
1da177e4 LT |
5436 | if (ret < 0) { |
5437 | dev_err(&udev->dev, "failed to restore interface %d " | |
5438 | "altsetting %d (error=%d)\n", | |
5439 | desc->bInterfaceNumber, | |
5440 | desc->bAlternateSetting, | |
5441 | ret); | |
5442 | goto re_enumerate; | |
5443 | } | |
7a7b562d HG |
5444 | /* Resetting also frees any allocated streams */ |
5445 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) | |
5446 | intf->cur_altsetting->endpoint[j].streams = 0; | |
1da177e4 LT |
5447 | } |
5448 | ||
5449 | done: | |
f74631e3 | 5450 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5451 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5452 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5453 | usb_enable_ltm(udev); |
e3376d6c XR |
5454 | usb_release_bos_descriptor(udev); |
5455 | udev->bos = bos; | |
1da177e4 | 5456 | return 0; |
469271f8 | 5457 | |
1da177e4 | 5458 | re_enumerate: |
6d1d0513 | 5459 | /* LPM state doesn't matter when we're about to destroy the device. */ |
1da177e4 | 5460 | hub_port_logical_disconnect(parent_hub, port1); |
e3376d6c XR |
5461 | usb_release_bos_descriptor(udev); |
5462 | udev->bos = bos; | |
1da177e4 LT |
5463 | return -ENODEV; |
5464 | } | |
79efa097 AS |
5465 | |
5466 | /** | |
742120c6 | 5467 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5468 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5469 | * |
5470 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5471 | * method), performs the port reset, and then lets the drivers know that | |
5472 | * the reset is over (using their post_reset method). | |
5473 | * | |
626f090c | 5474 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5475 | * |
626f090c | 5476 | * Note: |
79efa097 AS |
5477 | * The caller must own the device lock. For example, it's safe to use |
5478 | * this from a driver probe() routine after downloading new firmware. | |
5479 | * For calls that might not occur during probe(), drivers should lock | |
5480 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5481 | * |
5482 | * If an interface is currently being probed or disconnected, we assume | |
5483 | * its driver knows how to handle resets. For all other interfaces, | |
5484 | * if the driver doesn't have pre_reset and post_reset methods then | |
5485 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5486 | */ |
742120c6 | 5487 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5488 | { |
5489 | int ret; | |
852c4b43 | 5490 | int i; |
4d769def | 5491 | unsigned int noio_flag; |
5c79a1e3 | 5492 | struct usb_port *port_dev; |
79efa097 | 5493 | struct usb_host_config *config = udev->actconfig; |
5c79a1e3 | 5494 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
79efa097 AS |
5495 | |
5496 | if (udev->state == USB_STATE_NOTATTACHED || | |
5497 | udev->state == USB_STATE_SUSPENDED) { | |
5498 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5499 | udev->state); | |
5500 | return -EINVAL; | |
5501 | } | |
5502 | ||
5c79a1e3 DW |
5503 | if (!udev->parent) { |
5504 | /* this requires hcd-specific logic; see ohci_restart() */ | |
5505 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); | |
5506 | return -EISDIR; | |
5507 | } | |
5508 | ||
5509 | port_dev = hub->ports[udev->portnum - 1]; | |
5510 | ||
4d769def ML |
5511 | /* |
5512 | * Don't allocate memory with GFP_KERNEL in current | |
5513 | * context to avoid possible deadlock if usb mass | |
5514 | * storage interface or usbnet interface(iSCSI case) | |
5515 | * is included in current configuration. The easist | |
5516 | * approach is to do it for every device reset, | |
5517 | * because the device 'memalloc_noio' flag may have | |
5518 | * not been set before reseting the usb device. | |
5519 | */ | |
5520 | noio_flag = memalloc_noio_save(); | |
5521 | ||
645daaab | 5522 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5523 | usb_autoresume_device(udev); |
645daaab | 5524 | |
79efa097 | 5525 | if (config) { |
79efa097 | 5526 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5527 | struct usb_interface *cintf = config->interface[i]; |
5528 | struct usb_driver *drv; | |
78d9a487 | 5529 | int unbind = 0; |
852c4b43 AS |
5530 | |
5531 | if (cintf->dev.driver) { | |
79efa097 | 5532 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5533 | if (drv->pre_reset && drv->post_reset) |
5534 | unbind = (drv->pre_reset)(cintf); | |
5535 | else if (cintf->condition == | |
5536 | USB_INTERFACE_BOUND) | |
5537 | unbind = 1; | |
5538 | if (unbind) | |
5539 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5540 | } |
5541 | } | |
5542 | } | |
5543 | ||
5c79a1e3 | 5544 | usb_lock_port(port_dev); |
742120c6 | 5545 | ret = usb_reset_and_verify_device(udev); |
5c79a1e3 | 5546 | usb_unlock_port(port_dev); |
79efa097 AS |
5547 | |
5548 | if (config) { | |
79efa097 | 5549 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5550 | struct usb_interface *cintf = config->interface[i]; |
5551 | struct usb_driver *drv; | |
78d9a487 | 5552 | int rebind = cintf->needs_binding; |
852c4b43 | 5553 | |
78d9a487 | 5554 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5555 | drv = to_usb_driver(cintf->dev.driver); |
5556 | if (drv->post_reset) | |
78d9a487 AS |
5557 | rebind = (drv->post_reset)(cintf); |
5558 | else if (cintf->condition == | |
5559 | USB_INTERFACE_BOUND) | |
5560 | rebind = 1; | |
6aec044c AS |
5561 | if (rebind) |
5562 | cintf->needs_binding = 1; | |
79efa097 | 5563 | } |
79efa097 | 5564 | } |
6aec044c | 5565 | usb_unbind_and_rebind_marked_interfaces(udev); |
79efa097 AS |
5566 | } |
5567 | ||
94fcda1f | 5568 | usb_autosuspend_device(udev); |
4d769def | 5569 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5570 | return ret; |
5571 | } | |
742120c6 | 5572 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5573 | |
5574 | ||
5575 | /** | |
5576 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5577 | * @iface: USB interface belonging to the device to reset | |
5578 | * | |
5579 | * This function can be used to reset a USB device from an atomic | |
5580 | * context, where usb_reset_device() won't work (as it blocks). | |
5581 | * | |
5582 | * Doing a reset via this method is functionally equivalent to calling | |
5583 | * usb_reset_device(), except for the fact that it is delayed to a | |
5584 | * workqueue. This means that any drivers bound to other interfaces | |
5585 | * might be unbound, as well as users from usbfs in user space. | |
5586 | * | |
5587 | * Corner cases: | |
5588 | * | |
5589 | * - Scheduling two resets at the same time from two different drivers | |
5590 | * attached to two different interfaces of the same device is | |
5591 | * possible; depending on how the driver attached to each interface | |
5592 | * handles ->pre_reset(), the second reset might happen or not. | |
5593 | * | |
5594 | * - If a driver is unbound and it had a pending reset, the reset will | |
5595 | * be cancelled. | |
5596 | * | |
5597 | * - This function can be called during .probe() or .disconnect() | |
5598 | * times. On return from .disconnect(), any pending resets will be | |
5599 | * cancelled. | |
5600 | * | |
5601 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
5602 | * does its own. | |
5603 | * | |
5604 | * NOTE: We don't do any reference count tracking because it is not | |
5605 | * needed. The lifecycle of the work_struct is tied to the | |
5606 | * usb_interface. Before destroying the interface we cancel the | |
5607 | * work_struct, so the fact that work_struct is queued and or | |
5608 | * running means the interface (and thus, the device) exist and | |
5609 | * are referenced. | |
5610 | */ | |
5611 | void usb_queue_reset_device(struct usb_interface *iface) | |
5612 | { | |
5613 | schedule_work(&iface->reset_ws); | |
5614 | } | |
5615 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5616 | |
5617 | /** | |
5618 | * usb_hub_find_child - Get the pointer of child device | |
5619 | * attached to the port which is specified by @port1. | |
5620 | * @hdev: USB device belonging to the usb hub | |
5621 | * @port1: port num to indicate which port the child device | |
5622 | * is attached to. | |
5623 | * | |
5624 | * USB drivers call this function to get hub's child device | |
5625 | * pointer. | |
5626 | * | |
626f090c | 5627 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5628 | * child's usb_device pointer if non-NULL. |
5629 | */ | |
5630 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5631 | int port1) | |
5632 | { | |
ad493e5e | 5633 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5634 | |
5635 | if (port1 < 1 || port1 > hdev->maxchild) | |
5636 | return NULL; | |
5637 | return hub->ports[port1 - 1]->child; | |
5638 | } | |
5639 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5640 | |
d2123fd9 LT |
5641 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5642 | struct usb_hub_descriptor *desc) | |
5643 | { | |
d99f6b41 | 5644 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d2123fd9 LT |
5645 | enum usb_port_connect_type connect_type; |
5646 | int i; | |
5647 | ||
d99f6b41 DW |
5648 | if (!hub) |
5649 | return; | |
5650 | ||
d2123fd9 LT |
5651 | if (!hub_is_superspeed(hdev)) { |
5652 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5653 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5654 | |
d99f6b41 | 5655 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5656 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5657 | u8 mask = 1 << (i%8); | |
5658 | ||
5659 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
d99f6b41 | 5660 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5661 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
5662 | } | |
5663 | } | |
5664 | } | |
5665 | } else { | |
5666 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5667 | ||
5668 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5669 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5670 | |
d99f6b41 | 5671 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5672 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5673 | u16 mask = 1 << i; | |
5674 | ||
5675 | if (!(port_removable & mask)) { | |
d99f6b41 | 5676 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5677 | port_removable |= mask; |
5678 | } | |
5679 | } | |
5680 | } | |
5681 | ||
5682 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5683 | } | |
5684 | } | |
5685 | ||
d5575424 LT |
5686 | #ifdef CONFIG_ACPI |
5687 | /** | |
5688 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5689 | * @hdev: USB device belonging to the usb hub | |
5690 | * @port1: port num of the port | |
5691 | * | |
626f090c YB |
5692 | * Return: Port's acpi handle if successful, %NULL if params are |
5693 | * invalid. | |
d5575424 LT |
5694 | */ |
5695 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5696 | int port1) | |
5697 | { | |
ad493e5e | 5698 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5699 | |
41341261 MN |
5700 | if (!hub) |
5701 | return NULL; | |
5702 | ||
3a83f992 | 5703 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5704 | } |
5705 | #endif |