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> |
9c8d6178 | 25 | #include <linux/kthread.h> |
4186ecf8 | 26 | #include <linux/mutex.h> |
7dfb7103 | 27 | #include <linux/freezer.h> |
b04b3156 | 28 | #include <linux/random.h> |
ad493e5e | 29 | #include <linux/pm_qos.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | #include <asm/byteorder.h> | |
33 | ||
6e30d7cb | 34 | #include "hub.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 | ||
44 | /* khubd's worklist and its lock */ | |
45 | static DEFINE_SPINLOCK(hub_event_lock); | |
46 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
47 | ||
48 | /* Wakes up khubd */ | |
49 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
50 | ||
9c8d6178 | 51 | static struct task_struct *khubd_task; |
1da177e4 | 52 | |
d8521afe DW |
53 | /* synchronize hub-port add/remove and peering operations */ |
54 | DEFINE_MUTEX(usb_port_peer_mutex); | |
55 | ||
1da177e4 | 56 | /* cycle leds on hubs that aren't blinking for attention */ |
90ab5ee9 | 57 | static bool blinkenlights = 0; |
1da177e4 LT |
58 | module_param (blinkenlights, bool, S_IRUGO); |
59 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
60 | ||
fd7c519d JK |
61 | /* |
62 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
63 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
64 | */ | |
65 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
66 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
67 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
68 | MODULE_PARM_DESC(initial_descriptor_timeout, |
69 | "initial 64-byte descriptor request timeout in milliseconds " | |
70 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 71 | |
1da177e4 LT |
72 | /* |
73 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
74 | * closely resembles the way Windows works. Hopefully it will be compatible | |
75 | * with a wider range of devices than the old scheme. However some previously | |
76 | * working devices may start giving rise to "device not accepting address" | |
77 | * errors; if that happens the user can try the old scheme by adjusting the | |
78 | * following module parameters. | |
79 | * | |
80 | * For maximum flexibility there are two boolean parameters to control the | |
81 | * hub driver's behavior. On the first initialization attempt, if the | |
82 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
83 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
84 | * is set, then the driver will make another attempt, using the other scheme. | |
85 | */ | |
90ab5ee9 | 86 | static bool old_scheme_first = 0; |
1da177e4 LT |
87 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
88 | MODULE_PARM_DESC(old_scheme_first, | |
89 | "start with the old device initialization scheme"); | |
90 | ||
90ab5ee9 | 91 | static bool use_both_schemes = 1; |
1da177e4 LT |
92 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
93 | MODULE_PARM_DESC(use_both_schemes, | |
94 | "try the other device initialization scheme if the " | |
95 | "first one fails"); | |
96 | ||
32fe0198 AS |
97 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
98 | * port reset on some companion controllers. | |
99 | */ | |
100 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
101 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
102 | ||
ad493e5e | 103 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
104 | #define HUB_DEBOUNCE_STEP 25 |
105 | #define HUB_DEBOUNCE_STABLE 100 | |
106 | ||
742120c6 ML |
107 | static int usb_reset_and_verify_device(struct usb_device *udev); |
108 | ||
131dec34 | 109 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 110 | { |
131dec34 SS |
111 | if (hub_is_superspeed(hub->hdev)) |
112 | return "5.0 Gb/s"; | |
288ead45 | 113 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 114 | return "480 Mb/s"; |
288ead45 | 115 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
116 | return "1.5 Mb/s"; |
117 | else | |
118 | return "12 Mb/s"; | |
119 | } | |
1da177e4 LT |
120 | |
121 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 122 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 123 | { |
ff823c79 | 124 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 125 | return NULL; |
1da177e4 LT |
126 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
127 | } | |
128 | ||
140e3026 | 129 | static int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c SS |
130 | { |
131 | /* USB 2.1 (and greater) devices indicate LPM support through | |
132 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
133 | */ | |
134 | if (udev->speed == USB_SPEED_HIGH) { | |
135 | if (udev->bos->ext_cap && | |
136 | (USB_LPM_SUPPORT & | |
137 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
138 | return 1; | |
139 | return 0; | |
140 | } | |
51e0a012 | 141 | |
25cd2882 SS |
142 | /* |
143 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. | |
144 | * However, there are some that don't, and they set the U1/U2 exit | |
145 | * latencies to zero. | |
51e0a012 SS |
146 | */ |
147 | if (!udev->bos->ss_cap) { | |
25cd2882 | 148 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
51e0a012 SS |
149 | return 0; |
150 | } | |
51e0a012 | 151 | |
25cd2882 SS |
152 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
153 | udev->bos->ss_cap->bU2DevExitLat == 0) { | |
154 | if (udev->parent) | |
155 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); | |
156 | else | |
157 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); | |
51e0a012 SS |
158 | return 0; |
159 | } | |
51e0a012 | 160 | |
25cd2882 SS |
161 | if (!udev->parent || udev->parent->lpm_capable) |
162 | return 1; | |
d9b2099c SS |
163 | return 0; |
164 | } | |
165 | ||
51e0a012 SS |
166 | /* |
167 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
168 | * either U1 or U2. | |
169 | */ | |
170 | static void usb_set_lpm_mel(struct usb_device *udev, | |
171 | struct usb3_lpm_parameters *udev_lpm_params, | |
172 | unsigned int udev_exit_latency, | |
173 | struct usb_hub *hub, | |
174 | struct usb3_lpm_parameters *hub_lpm_params, | |
175 | unsigned int hub_exit_latency) | |
176 | { | |
177 | unsigned int total_mel; | |
178 | unsigned int device_mel; | |
179 | unsigned int hub_mel; | |
180 | ||
181 | /* | |
182 | * Calculate the time it takes to transition all links from the roothub | |
183 | * to the parent hub into U0. The parent hub must then decode the | |
184 | * packet (hub header decode latency) to figure out which port it was | |
185 | * bound for. | |
186 | * | |
187 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
188 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
189 | */ | |
190 | total_mel = hub_lpm_params->mel + | |
191 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
192 | ||
193 | /* | |
194 | * How long will it take to transition the downstream hub's port into | |
195 | * U0? The greater of either the hub exit latency or the device exit | |
196 | * latency. | |
197 | * | |
198 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
199 | * Multiply that by 1000 to get nanoseconds. | |
200 | */ | |
201 | device_mel = udev_exit_latency * 1000; | |
202 | hub_mel = hub_exit_latency * 1000; | |
203 | if (device_mel > hub_mel) | |
204 | total_mel += device_mel; | |
205 | else | |
206 | total_mel += hub_mel; | |
207 | ||
208 | udev_lpm_params->mel = total_mel; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
213 | * a transition from either U1 or U2. | |
214 | */ | |
215 | static void usb_set_lpm_pel(struct usb_device *udev, | |
216 | struct usb3_lpm_parameters *udev_lpm_params, | |
217 | unsigned int udev_exit_latency, | |
218 | struct usb_hub *hub, | |
219 | struct usb3_lpm_parameters *hub_lpm_params, | |
220 | unsigned int hub_exit_latency, | |
221 | unsigned int port_to_port_exit_latency) | |
222 | { | |
223 | unsigned int first_link_pel; | |
224 | unsigned int hub_pel; | |
225 | ||
226 | /* | |
227 | * First, the device sends an LFPS to transition the link between the | |
228 | * device and the parent hub into U0. The exit latency is the bigger of | |
229 | * the device exit latency or the hub exit latency. | |
230 | */ | |
231 | if (udev_exit_latency > hub_exit_latency) | |
232 | first_link_pel = udev_exit_latency * 1000; | |
233 | else | |
234 | first_link_pel = hub_exit_latency * 1000; | |
235 | ||
236 | /* | |
237 | * When the hub starts to receive the LFPS, there is a slight delay for | |
238 | * it to figure out that one of the ports is sending an LFPS. Then it | |
239 | * will forward the LFPS to its upstream link. The exit latency is the | |
240 | * delay, plus the PEL that we calculated for this hub. | |
241 | */ | |
242 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
243 | ||
244 | /* | |
245 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
246 | * is the greater of the two exit latencies. | |
247 | */ | |
248 | if (first_link_pel > hub_pel) | |
249 | udev_lpm_params->pel = first_link_pel; | |
250 | else | |
251 | udev_lpm_params->pel = hub_pel; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
256 | * when a device initiates a transition to U0, until when it will receive the | |
257 | * first packet from the host controller. | |
258 | * | |
259 | * Section C.1.5.1 describes the four components to this: | |
260 | * - t1: device PEL | |
261 | * - t2: time for the ERDY to make it from the device to the host. | |
262 | * - t3: a host-specific delay to process the ERDY. | |
263 | * - t4: time for the packet to make it from the host to the device. | |
264 | * | |
265 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
266 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
267 | * vendor says otherwise. | |
268 | */ | |
269 | static void usb_set_lpm_sel(struct usb_device *udev, | |
270 | struct usb3_lpm_parameters *udev_lpm_params) | |
271 | { | |
272 | struct usb_device *parent; | |
273 | unsigned int num_hubs; | |
274 | unsigned int total_sel; | |
275 | ||
276 | /* t1 = device PEL */ | |
277 | total_sel = udev_lpm_params->pel; | |
278 | /* How many external hubs are in between the device & the root port. */ | |
279 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
280 | parent = parent->parent) | |
281 | num_hubs++; | |
282 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
283 | if (num_hubs > 0) | |
284 | total_sel += 2100 + 250 * (num_hubs - 1); | |
285 | ||
286 | /* t4 = 250ns * num_hubs */ | |
287 | total_sel += 250 * num_hubs; | |
288 | ||
289 | udev_lpm_params->sel = total_sel; | |
290 | } | |
291 | ||
292 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
293 | { | |
294 | struct usb_hub *hub; | |
295 | unsigned int port_to_port_delay; | |
296 | unsigned int udev_u1_del; | |
297 | unsigned int udev_u2_del; | |
298 | unsigned int hub_u1_del; | |
299 | unsigned int hub_u2_del; | |
300 | ||
301 | if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) | |
302 | return; | |
303 | ||
ad493e5e | 304 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
305 | /* It doesn't take time to transition the roothub into U0, since it |
306 | * doesn't have an upstream link. | |
307 | */ | |
308 | if (!hub) | |
309 | return; | |
310 | ||
311 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
4d967995 | 312 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
51e0a012 | 313 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
4d967995 | 314 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
51e0a012 SS |
315 | |
316 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
317 | hub, &udev->parent->u1_params, hub_u1_del); | |
318 | ||
319 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
320 | hub, &udev->parent->u2_params, hub_u2_del); | |
321 | ||
322 | /* | |
323 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
324 | * when the parent hub notices the downstream port is trying to | |
325 | * transition to U0 to when the hub initiates a U0 transition on its | |
326 | * upstream port. The section says the delays are tPort2PortU1EL and | |
327 | * tPort2PortU2EL, but it doesn't define what they are. | |
328 | * | |
329 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
330 | * about the same delays. Use the maximum delay calculations from those | |
331 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
332 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
333 | * assume the device exit latencies they are talking about are the hub | |
334 | * exit latencies. | |
335 | * | |
336 | * What do we do if the U2 exit latency is less than the U1 exit | |
337 | * latency? It's possible, although not likely... | |
338 | */ | |
339 | port_to_port_delay = 1; | |
340 | ||
341 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
342 | hub, &udev->parent->u1_params, hub_u1_del, | |
343 | port_to_port_delay); | |
344 | ||
345 | if (hub_u2_del > hub_u1_del) | |
346 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
347 | else | |
348 | port_to_port_delay = 1 + hub_u1_del; | |
349 | ||
350 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
351 | hub, &udev->parent->u2_params, hub_u2_del, | |
352 | port_to_port_delay); | |
353 | ||
354 | /* Now that we've got PEL, calculate SEL. */ | |
355 | usb_set_lpm_sel(udev, &udev->u1_params); | |
356 | usb_set_lpm_sel(udev, &udev->u2_params); | |
357 | } | |
358 | ||
1da177e4 | 359 | /* USB 2.0 spec Section 11.24.4.5 */ |
dbe79bbe | 360 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
1da177e4 | 361 | { |
dbe79bbe JY |
362 | int i, ret, size; |
363 | unsigned dtype; | |
364 | ||
365 | if (hub_is_superspeed(hdev)) { | |
366 | dtype = USB_DT_SS_HUB; | |
367 | size = USB_DT_SS_HUB_SIZE; | |
368 | } else { | |
369 | dtype = USB_DT_HUB; | |
370 | size = sizeof(struct usb_hub_descriptor); | |
371 | } | |
1da177e4 LT |
372 | |
373 | for (i = 0; i < 3; i++) { | |
374 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
375 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
dbe79bbe | 376 | dtype << 8, 0, data, size, |
1da177e4 LT |
377 | USB_CTRL_GET_TIMEOUT); |
378 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
379 | return ret; | |
380 | } | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | /* | |
385 | * USB 2.0 spec Section 11.24.2.1 | |
386 | */ | |
387 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
388 | { | |
389 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
390 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
391 | } | |
392 | ||
393 | /* | |
394 | * USB 2.0 spec Section 11.24.2.2 | |
395 | */ | |
ad493e5e | 396 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
397 | { |
398 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
399 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
400 | NULL, 0, 1000); | |
401 | } | |
402 | ||
403 | /* | |
404 | * USB 2.0 spec Section 11.24.2.13 | |
405 | */ | |
406 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
407 | { | |
408 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
409 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
410 | NULL, 0, 1000); | |
411 | } | |
412 | ||
d99f6b41 DW |
413 | static char *to_led_name(int selector) |
414 | { | |
415 | switch (selector) { | |
416 | case HUB_LED_AMBER: | |
417 | return "amber"; | |
418 | case HUB_LED_GREEN: | |
419 | return "green"; | |
420 | case HUB_LED_OFF: | |
421 | return "off"; | |
422 | case HUB_LED_AUTO: | |
423 | return "auto"; | |
424 | default: | |
425 | return "??"; | |
426 | } | |
427 | } | |
428 | ||
1da177e4 LT |
429 | /* |
430 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
431 | * for info about using port indicators | |
432 | */ | |
d99f6b41 | 433 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
1da177e4 | 434 | { |
d99f6b41 DW |
435 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
436 | int status; | |
437 | ||
438 | status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
1da177e4 | 439 | USB_PORT_FEAT_INDICATOR); |
d99f6b41 DW |
440 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
441 | to_led_name(selector), status); | |
1da177e4 LT |
442 | } |
443 | ||
444 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
445 | ||
c4028958 | 446 | static void led_work (struct work_struct *work) |
1da177e4 | 447 | { |
c4028958 DH |
448 | struct usb_hub *hub = |
449 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
450 | struct usb_device *hdev = hub->hdev; |
451 | unsigned i; | |
452 | unsigned changed = 0; | |
453 | int cursor = -1; | |
454 | ||
455 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
456 | return; | |
457 | ||
3bbc47d8 | 458 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
459 | unsigned selector, mode; |
460 | ||
461 | /* 30%-50% duty cycle */ | |
462 | ||
463 | switch (hub->indicator[i]) { | |
464 | /* cycle marker */ | |
465 | case INDICATOR_CYCLE: | |
466 | cursor = i; | |
467 | selector = HUB_LED_AUTO; | |
468 | mode = INDICATOR_AUTO; | |
469 | break; | |
470 | /* blinking green = sw attention */ | |
471 | case INDICATOR_GREEN_BLINK: | |
472 | selector = HUB_LED_GREEN; | |
473 | mode = INDICATOR_GREEN_BLINK_OFF; | |
474 | break; | |
475 | case INDICATOR_GREEN_BLINK_OFF: | |
476 | selector = HUB_LED_OFF; | |
477 | mode = INDICATOR_GREEN_BLINK; | |
478 | break; | |
479 | /* blinking amber = hw attention */ | |
480 | case INDICATOR_AMBER_BLINK: | |
481 | selector = HUB_LED_AMBER; | |
482 | mode = INDICATOR_AMBER_BLINK_OFF; | |
483 | break; | |
484 | case INDICATOR_AMBER_BLINK_OFF: | |
485 | selector = HUB_LED_OFF; | |
486 | mode = INDICATOR_AMBER_BLINK; | |
487 | break; | |
488 | /* blink green/amber = reserved */ | |
489 | case INDICATOR_ALT_BLINK: | |
490 | selector = HUB_LED_GREEN; | |
491 | mode = INDICATOR_ALT_BLINK_OFF; | |
492 | break; | |
493 | case INDICATOR_ALT_BLINK_OFF: | |
494 | selector = HUB_LED_AMBER; | |
495 | mode = INDICATOR_ALT_BLINK; | |
496 | break; | |
497 | default: | |
498 | continue; | |
499 | } | |
500 | if (selector != HUB_LED_AUTO) | |
501 | changed = 1; | |
502 | set_port_led(hub, i + 1, selector); | |
503 | hub->indicator[i] = mode; | |
504 | } | |
505 | if (!changed && blinkenlights) { | |
506 | cursor++; | |
3bbc47d8 | 507 | cursor %= hdev->maxchild; |
1da177e4 LT |
508 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
509 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
510 | changed++; | |
511 | } | |
512 | if (changed) | |
22f6a0f0 SD |
513 | queue_delayed_work(system_power_efficient_wq, |
514 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
515 | } |
516 | ||
517 | /* use a short timeout for hub/port status fetches */ | |
518 | #define USB_STS_TIMEOUT 1000 | |
519 | #define USB_STS_RETRIES 5 | |
520 | ||
521 | /* | |
522 | * USB 2.0 spec Section 11.24.2.6 | |
523 | */ | |
524 | static int get_hub_status(struct usb_device *hdev, | |
525 | struct usb_hub_status *data) | |
526 | { | |
527 | int i, status = -ETIMEDOUT; | |
528 | ||
3824c1dd LP |
529 | for (i = 0; i < USB_STS_RETRIES && |
530 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
531 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
532 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
533 | data, sizeof(*data), USB_STS_TIMEOUT); | |
534 | } | |
535 | return status; | |
536 | } | |
537 | ||
538 | /* | |
539 | * USB 2.0 spec Section 11.24.2.7 | |
540 | */ | |
541 | static int get_port_status(struct usb_device *hdev, int port1, | |
542 | struct usb_port_status *data) | |
543 | { | |
544 | int i, status = -ETIMEDOUT; | |
545 | ||
3824c1dd LP |
546 | for (i = 0; i < USB_STS_RETRIES && |
547 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
548 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
549 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
550 | data, sizeof(*data), USB_STS_TIMEOUT); | |
551 | } | |
552 | return status; | |
553 | } | |
554 | ||
3eb14915 AS |
555 | static int hub_port_status(struct usb_hub *hub, int port1, |
556 | u16 *status, u16 *change) | |
557 | { | |
558 | int ret; | |
559 | ||
560 | mutex_lock(&hub->status_mutex); | |
561 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
562 | if (ret < 4) { | |
e9e88fb7 AS |
563 | if (ret != -ENODEV) |
564 | dev_err(hub->intfdev, | |
565 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
566 | if (ret >= 0) |
567 | ret = -EIO; | |
568 | } else { | |
569 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
570 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
dbe79bbe | 571 | |
3eb14915 AS |
572 | ret = 0; |
573 | } | |
574 | mutex_unlock(&hub->status_mutex); | |
575 | return ret; | |
576 | } | |
577 | ||
1da177e4 LT |
578 | static void kick_khubd(struct usb_hub *hub) |
579 | { | |
580 | unsigned long flags; | |
581 | ||
582 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 583 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 584 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
585 | |
586 | /* Suppress autosuspend until khubd runs */ | |
587 | usb_autopm_get_interface_no_resume( | |
588 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
589 | wake_up(&khubd_wait); |
590 | } | |
591 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
592 | } | |
593 | ||
594 | void usb_kick_khubd(struct usb_device *hdev) | |
595 | { | |
ad493e5e | 596 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
597 | |
598 | if (hub) | |
599 | kick_khubd(hub); | |
1da177e4 LT |
600 | } |
601 | ||
4ee823b8 SS |
602 | /* |
603 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
604 | * Notification, which indicates it had initiated remote wakeup. | |
605 | * | |
606 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
607 | * device initiates resume, so the USB core will not receive notice of the | |
608 | * resume through the normal hub interrupt URB. | |
609 | */ | |
610 | void usb_wakeup_notification(struct usb_device *hdev, | |
611 | unsigned int portnum) | |
612 | { | |
613 | struct usb_hub *hub; | |
614 | ||
615 | if (!hdev) | |
616 | return; | |
617 | ||
ad493e5e | 618 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
619 | if (hub) { |
620 | set_bit(portnum, hub->wakeup_bits); | |
621 | kick_khubd(hub); | |
622 | } | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
625 | |
626 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 627 | static void hub_irq(struct urb *urb) |
1da177e4 | 628 | { |
ec17cf1c | 629 | struct usb_hub *hub = urb->context; |
e015268d | 630 | int status = urb->status; |
71d2718f | 631 | unsigned i; |
1da177e4 LT |
632 | unsigned long bits; |
633 | ||
e015268d | 634 | switch (status) { |
1da177e4 LT |
635 | case -ENOENT: /* synchronous unlink */ |
636 | case -ECONNRESET: /* async unlink */ | |
637 | case -ESHUTDOWN: /* hardware going away */ | |
638 | return; | |
639 | ||
640 | default: /* presumably an error */ | |
641 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 642 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
643 | if ((++hub->nerrors < 10) || hub->error) |
644 | goto resubmit; | |
e015268d | 645 | hub->error = status; |
1da177e4 | 646 | /* FALL THROUGH */ |
ec17cf1c | 647 | |
1da177e4 LT |
648 | /* let khubd handle things */ |
649 | case 0: /* we got data: port status changed */ | |
650 | bits = 0; | |
651 | for (i = 0; i < urb->actual_length; ++i) | |
652 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
653 | << (i*8); | |
654 | hub->event_bits[0] = bits; | |
655 | break; | |
656 | } | |
657 | ||
658 | hub->nerrors = 0; | |
659 | ||
660 | /* Something happened, let khubd figure it out */ | |
661 | kick_khubd(hub); | |
662 | ||
663 | resubmit: | |
664 | if (hub->quiescing) | |
665 | return; | |
666 | ||
667 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
668 | && status != -ENODEV && status != -EPERM) | |
669 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
670 | } | |
671 | ||
672 | /* USB 2.0 spec Section 11.24.2.3 */ | |
673 | static inline int | |
674 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
675 | { | |
2c7b871b WG |
676 | /* Need to clear both directions for control ep */ |
677 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
678 | USB_ENDPOINT_XFER_CONTROL) { | |
679 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
680 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
681 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
682 | if (status) | |
683 | return status; | |
684 | } | |
c2f6595f | 685 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
686 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
687 | tt, NULL, 0, 1000); | |
688 | } | |
689 | ||
690 | /* | |
691 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
692 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
693 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
694 | * both can talk to the same hub concurrently. | |
695 | */ | |
cb88a1b8 | 696 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 697 | { |
c4028958 | 698 | struct usb_hub *hub = |
cb88a1b8 | 699 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
700 | unsigned long flags; |
701 | ||
702 | spin_lock_irqsave (&hub->tt.lock, flags); | |
3b6054da | 703 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 704 | struct list_head *next; |
1da177e4 LT |
705 | struct usb_tt_clear *clear; |
706 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 707 | const struct hc_driver *drv; |
1da177e4 LT |
708 | int status; |
709 | ||
d0f830d3 HS |
710 | next = hub->tt.clear_list.next; |
711 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
712 | list_del (&clear->clear_list); |
713 | ||
714 | /* drop lock so HCD can concurrently report other TT errors */ | |
715 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
716 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 717 | if (status && status != -ENODEV) |
1da177e4 LT |
718 | dev_err (&hdev->dev, |
719 | "clear tt %d (%04x) error %d\n", | |
720 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
721 | |
722 | /* Tell the HCD, even if the operation failed */ | |
723 | drv = clear->hcd->driver; | |
724 | if (drv->clear_tt_buffer_complete) | |
725 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
726 | ||
1bc3c9e1 | 727 | kfree(clear); |
cb88a1b8 | 728 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
729 | } |
730 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
731 | } | |
732 | ||
971fcd49 LT |
733 | /** |
734 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
735 | * @hdev: USB device belonging to the usb hub |
736 | * @hub: target hub | |
971fcd49 LT |
737 | * @port1: port index |
738 | * @set: expected status | |
739 | * | |
740 | * call this function to control port's power via setting or | |
741 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
742 | * |
743 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 744 | */ |
41341261 MN |
745 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
746 | int port1, bool set) | |
971fcd49 LT |
747 | { |
748 | int ret; | |
749 | ||
750 | if (set) | |
751 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
752 | else | |
ad493e5e LT |
753 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
754 | ||
d5c3834e DW |
755 | if (ret) |
756 | return ret; | |
757 | ||
758 | if (set) | |
759 | set_bit(port1, hub->power_bits); | |
760 | else | |
761 | clear_bit(port1, hub->power_bits); | |
762 | return 0; | |
971fcd49 LT |
763 | } |
764 | ||
1da177e4 | 765 | /** |
cb88a1b8 AS |
766 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
767 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
768 | * |
769 | * High speed HCDs use this to tell the hub driver that some split control or | |
770 | * bulk transaction failed in a way that requires clearing internal state of | |
771 | * a transaction translator. This is normally detected (and reported) from | |
772 | * interrupt context. | |
773 | * | |
774 | * It may not be possible for that hub to handle additional full (or low) | |
775 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
776 | * |
777 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 778 | */ |
cb88a1b8 | 779 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 780 | { |
cb88a1b8 AS |
781 | struct usb_device *udev = urb->dev; |
782 | int pipe = urb->pipe; | |
1da177e4 LT |
783 | struct usb_tt *tt = udev->tt; |
784 | unsigned long flags; | |
785 | struct usb_tt_clear *clear; | |
786 | ||
787 | /* we've got to cope with an arbitrary number of pending TT clears, | |
788 | * since each TT has "at least two" buffers that can need it (and | |
789 | * there can be many TTs per hub). even if they're uncommon. | |
790 | */ | |
54e6ecb2 | 791 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
792 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
793 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 794 | return -ENOMEM; |
1da177e4 LT |
795 | } |
796 | ||
797 | /* info that CLEAR_TT_BUFFER needs */ | |
798 | clear->tt = tt->multi ? udev->ttport : 1; | |
799 | clear->devinfo = usb_pipeendpoint (pipe); | |
800 | clear->devinfo |= udev->devnum << 4; | |
801 | clear->devinfo |= usb_pipecontrol (pipe) | |
802 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
803 | : (USB_ENDPOINT_XFER_BULK << 11); | |
804 | if (usb_pipein (pipe)) | |
805 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
806 | |
807 | /* info for completion callback */ | |
808 | clear->hcd = bus_to_hcd(udev->bus); | |
809 | clear->ep = urb->ep; | |
810 | ||
1da177e4 LT |
811 | /* tell keventd to clear state for this TT */ |
812 | spin_lock_irqsave (&tt->lock, flags); | |
813 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 814 | schedule_work(&tt->clear_work); |
1da177e4 | 815 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 816 | return 0; |
1da177e4 | 817 | } |
cb88a1b8 | 818 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 819 | |
7ad3c470 | 820 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
1da177e4 LT |
821 | { |
822 | int port1; | |
4489a571 AS |
823 | |
824 | /* Enable power on each port. Some hubs have reserved values | |
825 | * of LPSM (> 2) in their descriptors, even though they are | |
826 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
827 | * but only emulate it. In all cases, the ports won't work | |
828 | * unless we send these messages to the hub. | |
829 | */ | |
9262c19d | 830 | if (hub_is_port_power_switchable(hub)) |
1da177e4 | 831 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
832 | else |
833 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
834 | "non-switchable hub\n"); | |
3bbc47d8 | 835 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
d5c3834e | 836 | if (test_bit(port1, hub->power_bits)) |
ad493e5e LT |
837 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
838 | else | |
839 | usb_clear_port_feature(hub->hdev, port1, | |
840 | USB_PORT_FEAT_POWER); | |
8520f380 | 841 | if (do_delay) |
7ad3c470 | 842 | msleep(hub_power_on_good_delay(hub)); |
1da177e4 LT |
843 | } |
844 | ||
1da177e4 LT |
845 | static int hub_hub_status(struct usb_hub *hub, |
846 | u16 *status, u16 *change) | |
847 | { | |
848 | int ret; | |
849 | ||
db90e7a1 | 850 | mutex_lock(&hub->status_mutex); |
1da177e4 | 851 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
852 | if (ret < 0) { |
853 | if (ret != -ENODEV) | |
854 | dev_err(hub->intfdev, | |
855 | "%s failed (err = %d)\n", __func__, ret); | |
856 | } else { | |
1da177e4 | 857 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 858 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
859 | ret = 0; |
860 | } | |
db90e7a1 | 861 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
862 | return ret; |
863 | } | |
864 | ||
41e7e056 SS |
865 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
866 | unsigned int link_status) | |
867 | { | |
868 | return set_port_feature(hub->hdev, | |
869 | port1 | (link_status << 3), | |
870 | USB_PORT_FEAT_LINK_STATE); | |
871 | } | |
872 | ||
873 | /* | |
874 | * If USB 3.0 ports are placed into the Disabled state, they will no longer | |
875 | * detect any device connects or disconnects. This is generally not what the | |
876 | * USB core wants, since it expects a disabled port to produce a port status | |
877 | * change event when a new device connects. | |
878 | * | |
879 | * Instead, set the link state to Disabled, wait for the link to settle into | |
880 | * that state, clear any change bits, and then put the port into the RxDetect | |
881 | * state. | |
882 | */ | |
883 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) | |
884 | { | |
885 | int ret; | |
886 | int total_time; | |
887 | u16 portchange, portstatus; | |
888 | ||
889 | if (!hub_is_superspeed(hub->hdev)) | |
890 | return -EINVAL; | |
891 | ||
bb86cf56 GG |
892 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
893 | if (ret < 0) | |
894 | return ret; | |
895 | ||
896 | /* | |
897 | * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI | |
898 | * Controller [1022:7814] will have spurious result making the following | |
899 | * usb 3.0 device hotplugging route to the 2.0 root hub and recognized | |
900 | * as high-speed device if we set the usb 3.0 port link state to | |
901 | * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we | |
902 | * check the state here to avoid the bug. | |
903 | */ | |
904 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
905 | USB_SS_PORT_LS_RX_DETECT) { | |
906 | dev_dbg(&hub->ports[port1 - 1]->dev, | |
907 | "Not disabling port; link state is RxDetect\n"); | |
908 | return ret; | |
909 | } | |
910 | ||
41e7e056 | 911 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); |
e9e88fb7 | 912 | if (ret) |
41e7e056 | 913 | return ret; |
41e7e056 SS |
914 | |
915 | /* Wait for the link to enter the disabled state. */ | |
916 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
917 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
918 | if (ret < 0) | |
919 | return ret; | |
920 | ||
921 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
922 | USB_SS_PORT_LS_SS_DISABLED) | |
923 | break; | |
924 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
925 | break; | |
926 | msleep(HUB_DEBOUNCE_STEP); | |
927 | } | |
928 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
d99f6b41 DW |
929 | dev_warn(&hub->ports[port1 - 1]->dev, |
930 | "Could not disable after %d ms\n", total_time); | |
41e7e056 SS |
931 | |
932 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); | |
933 | } | |
934 | ||
8b28c752 AS |
935 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
936 | { | |
d99f6b41 | 937 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
8b28c752 | 938 | struct usb_device *hdev = hub->hdev; |
0458d5b4 | 939 | int ret = 0; |
8b28c752 | 940 | |
d99f6b41 DW |
941 | if (port_dev->child && set_state) |
942 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); | |
41e7e056 SS |
943 | if (!hub->error) { |
944 | if (hub_is_superspeed(hub->hdev)) | |
945 | ret = hub_usb3_port_disable(hub, port1); | |
946 | else | |
ad493e5e | 947 | ret = usb_clear_port_feature(hdev, port1, |
41e7e056 SS |
948 | USB_PORT_FEAT_ENABLE); |
949 | } | |
e9e88fb7 | 950 | if (ret && ret != -ENODEV) |
d99f6b41 | 951 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
8b28c752 AS |
952 | return ret; |
953 | } | |
954 | ||
0458d5b4 | 955 | /* |
6d42fcdb | 956 | * Disable a port and mark a logical connect-change event, so that some |
0458d5b4 AS |
957 | * time later khubd will disconnect() any existing usb_device on the port |
958 | * and will re-enumerate if there actually is a device attached. | |
959 | */ | |
960 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
961 | { | |
d99f6b41 | 962 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
0458d5b4 | 963 | hub_port_disable(hub, port1, 1); |
7d069b7d | 964 | |
0458d5b4 AS |
965 | /* FIXME let caller ask to power down the port: |
966 | * - some devices won't enumerate without a VBUS power cycle | |
967 | * - SRP saves power that way | |
968 | * - ... new call, TBD ... | |
969 | * That's easy if this hub can switch power per-port, and | |
970 | * khubd reactivates the port later (timer, SRP, etc). | |
971 | * Powerdown must be optional, because of reset/DFU. | |
972 | */ | |
973 | ||
974 | set_bit(port1, hub->change_bits); | |
469271f8 | 975 | kick_khubd(hub); |
0458d5b4 AS |
976 | } |
977 | ||
253e0572 AS |
978 | /** |
979 | * usb_remove_device - disable a device's port on its parent hub | |
980 | * @udev: device to be disabled and removed | |
981 | * Context: @udev locked, must be able to sleep. | |
982 | * | |
983 | * After @udev's port has been disabled, khubd is notified and it will | |
984 | * see that the device has been disconnected. When the device is | |
985 | * physically unplugged and something is plugged in, the events will | |
986 | * be received and processed normally. | |
626f090c YB |
987 | * |
988 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
989 | */ |
990 | int usb_remove_device(struct usb_device *udev) | |
991 | { | |
992 | struct usb_hub *hub; | |
993 | struct usb_interface *intf; | |
994 | ||
995 | if (!udev->parent) /* Can't remove a root hub */ | |
996 | return -EINVAL; | |
ad493e5e | 997 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
998 | intf = to_usb_interface(hub->intfdev); |
999 | ||
1000 | usb_autopm_get_interface(intf); | |
1001 | set_bit(udev->portnum, hub->removed_bits); | |
1002 | hub_port_logical_disconnect(hub, udev->portnum); | |
1003 | usb_autopm_put_interface(intf); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
6ee0b270 | 1007 | enum hub_activation_type { |
8e4ceb38 | 1008 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 1009 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 1010 | }; |
5e6effae | 1011 | |
8520f380 AS |
1012 | static void hub_init_func2(struct work_struct *ws); |
1013 | static void hub_init_func3(struct work_struct *ws); | |
1014 | ||
f2835219 | 1015 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
1016 | { |
1017 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
1018 | struct usb_hcd *hcd; |
1019 | int ret; | |
5e6effae | 1020 | int port1; |
f2835219 | 1021 | int status; |
948fea37 | 1022 | bool need_debounce_delay = false; |
8520f380 AS |
1023 | unsigned delay; |
1024 | ||
1025 | /* Continue a partial initialization */ | |
1026 | if (type == HUB_INIT2) | |
1027 | goto init2; | |
1028 | if (type == HUB_INIT3) | |
1029 | goto init3; | |
5e6effae | 1030 | |
a45aa3b3 EF |
1031 | /* The superspeed hub except for root hub has to use Hub Depth |
1032 | * value as an offset into the route string to locate the bits | |
1033 | * it uses to determine the downstream port number. So hub driver | |
1034 | * should send a set hub depth request to superspeed hub after | |
1035 | * the superspeed hub is set configuration in initialization or | |
1036 | * reset procedure. | |
1037 | * | |
1038 | * After a resume, port power should still be on. | |
f2835219 AS |
1039 | * For any other type of activation, turn it on. |
1040 | */ | |
8520f380 | 1041 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1042 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1043 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1044 | HUB_SET_DEPTH, USB_RT_HUB, | |
1045 | hdev->level - 1, 0, NULL, 0, | |
1046 | USB_CTRL_SET_TIMEOUT); | |
1047 | if (ret < 0) | |
1048 | dev_err(hub->intfdev, | |
1049 | "set hub depth failed\n"); | |
1050 | } | |
8520f380 AS |
1051 | |
1052 | /* Speed up system boot by using a delayed_work for the | |
1053 | * hub's initial power-up delays. This is pretty awkward | |
1054 | * and the implementation looks like a home-brewed sort of | |
1055 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1056 | * root hub (assuming usbcore is compiled into the kernel | |
1057 | * rather than as a module). It adds up. | |
1058 | * | |
1059 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1060 | * because for those activation types the ports have to be | |
1061 | * operational when we return. In theory this could be done | |
1062 | * for HUB_POST_RESET, but it's easier not to. | |
1063 | */ | |
1064 | if (type == HUB_INIT) { | |
7ad3c470 DW |
1065 | unsigned delay = hub_power_on_good_delay(hub); |
1066 | ||
1067 | hub_power_on(hub, false); | |
77fa83cf | 1068 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
22f6a0f0 SD |
1069 | queue_delayed_work(system_power_efficient_wq, |
1070 | &hub->init_work, | |
8520f380 | 1071 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1072 | |
1073 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1074 | usb_autopm_get_interface_no_resume( |
1075 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1076 | return; /* Continues at init2: below */ |
653a39d1 SS |
1077 | } else if (type == HUB_RESET_RESUME) { |
1078 | /* The internal host controller state for the hub device | |
1079 | * may be gone after a host power loss on system resume. | |
1080 | * Update the device's info so the HW knows it's a hub. | |
1081 | */ | |
1082 | hcd = bus_to_hcd(hdev->bus); | |
1083 | if (hcd->driver->update_hub_device) { | |
1084 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1085 | &hub->tt, GFP_NOIO); | |
1086 | if (ret < 0) { | |
1087 | dev_err(hub->intfdev, "Host not " | |
1088 | "accepting hub info " | |
1089 | "update.\n"); | |
1090 | dev_err(hub->intfdev, "LS/FS devices " | |
1091 | "and hubs may not work " | |
1092 | "under this hub\n."); | |
1093 | } | |
1094 | } | |
1095 | hub_power_on(hub, true); | |
8520f380 AS |
1096 | } else { |
1097 | hub_power_on(hub, true); | |
1098 | } | |
1099 | } | |
1100 | init2: | |
f2835219 | 1101 | |
d99f6b41 DW |
1102 | /* |
1103 | * Check each port and set hub->change_bits to let khubd know | |
6ee0b270 | 1104 | * which ports need attention. |
5e6effae AS |
1105 | */ |
1106 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
1107 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1108 | struct usb_device *udev = port_dev->child; | |
5e6effae AS |
1109 | u16 portstatus, portchange; |
1110 | ||
6ee0b270 AS |
1111 | portstatus = portchange = 0; |
1112 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1113 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
d99f6b41 DW |
1114 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
1115 | portstatus, portchange); | |
6ee0b270 | 1116 | |
d99f6b41 DW |
1117 | /* |
1118 | * After anything other than HUB_RESUME (i.e., initialization | |
6ee0b270 AS |
1119 | * or any sort of reset), every port should be disabled. |
1120 | * Unconnected ports should likewise be disabled (paranoia), | |
1121 | * and so should ports for which we have no usb_device. | |
1122 | */ | |
1123 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1124 | type != HUB_RESUME || | |
1125 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1126 | !udev || | |
1127 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1128 | /* |
1129 | * USB3 protocol ports will automatically transition | |
1130 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1131 | * Do not disable USB3 protocol ports, just pretend |
1132 | * power was lost | |
9f0a6cd3 | 1133 | */ |
fd1ac4cf DW |
1134 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1135 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1136 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1137 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1138 | } |
1139 | ||
948fea37 AS |
1140 | /* Clear status-change flags; we'll debounce later */ |
1141 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1142 | need_debounce_delay = true; | |
ad493e5e | 1143 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1144 | USB_PORT_FEAT_C_CONNECTION); |
1145 | } | |
1146 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1147 | need_debounce_delay = true; | |
ad493e5e | 1148 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1149 | USB_PORT_FEAT_C_ENABLE); |
1150 | } | |
e92aee33 JW |
1151 | if (portchange & USB_PORT_STAT_C_RESET) { |
1152 | need_debounce_delay = true; | |
1153 | usb_clear_port_feature(hub->hdev, port1, | |
1154 | USB_PORT_FEAT_C_RESET); | |
1155 | } | |
79c3dd81 DZ |
1156 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1157 | hub_is_superspeed(hub->hdev)) { | |
1158 | need_debounce_delay = true; | |
ad493e5e | 1159 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1160 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1161 | } | |
253e0572 AS |
1162 | /* We can forget about a "removed" device when there's a |
1163 | * physical disconnect or the connect status changes. | |
1164 | */ | |
1165 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1166 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1167 | clear_bit(port1, hub->removed_bits); | |
1168 | ||
6ee0b270 AS |
1169 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
1170 | /* Tell khubd to disconnect the device or | |
1171 | * check for a new connection | |
1172 | */ | |
08d1dec6 SG |
1173 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
1174 | (portstatus & USB_PORT_STAT_OVERCURRENT)) | |
6ee0b270 AS |
1175 | set_bit(port1, hub->change_bits); |
1176 | ||
1177 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1178 | bool port_resumed = (portstatus & |
1179 | USB_PORT_STAT_LINK_STATE) == | |
1180 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1181 | /* The power session apparently survived the resume. |
1182 | * If there was an overcurrent or suspend change | |
1183 | * (i.e., remote wakeup request), have khubd | |
72937e1e SS |
1184 | * take care of it. Look at the port link state |
1185 | * for USB 3.0 hubs, since they don't have a suspend | |
1186 | * change bit, and they don't set the port link change | |
1187 | * bit on device-initiated resume. | |
6ee0b270 | 1188 | */ |
72937e1e SS |
1189 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1190 | port_resumed)) | |
6ee0b270 | 1191 | set_bit(port1, hub->change_bits); |
5e6effae | 1192 | |
6ee0b270 | 1193 | } else if (udev->persist_enabled) { |
6ee0b270 | 1194 | #ifdef CONFIG_PM |
5e6effae | 1195 | udev->reset_resume = 1; |
6ee0b270 | 1196 | #endif |
ad493e5e LT |
1197 | /* Don't set the change_bits when the device |
1198 | * was powered off. | |
1199 | */ | |
d5c3834e | 1200 | if (test_bit(port1, hub->power_bits)) |
ad493e5e | 1201 | set_bit(port1, hub->change_bits); |
8808f00c | 1202 | |
6ee0b270 AS |
1203 | } else { |
1204 | /* The power session is gone; tell khubd */ | |
1205 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1206 | set_bit(port1, hub->change_bits); | |
5e6effae | 1207 | } |
5e6effae AS |
1208 | } |
1209 | ||
948fea37 AS |
1210 | /* If no port-status-change flags were set, we don't need any |
1211 | * debouncing. If flags were set we can try to debounce the | |
1212 | * ports all at once right now, instead of letting khubd do them | |
1213 | * one at a time later on. | |
1214 | * | |
1215 | * If any port-status changes do occur during this delay, khubd | |
1216 | * will see them later and handle them normally. | |
1217 | */ | |
8520f380 AS |
1218 | if (need_debounce_delay) { |
1219 | delay = HUB_DEBOUNCE_STABLE; | |
1220 | ||
1221 | /* Don't do a long sleep inside a workqueue routine */ | |
1222 | if (type == HUB_INIT2) { | |
77fa83cf | 1223 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
22f6a0f0 SD |
1224 | queue_delayed_work(system_power_efficient_wq, |
1225 | &hub->init_work, | |
8520f380 AS |
1226 | msecs_to_jiffies(delay)); |
1227 | return; /* Continues at init3: below */ | |
1228 | } else { | |
1229 | msleep(delay); | |
1230 | } | |
1231 | } | |
1232 | init3: | |
f2835219 AS |
1233 | hub->quiescing = 0; |
1234 | ||
1235 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1236 | if (status < 0) | |
1237 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1238 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1239 | queue_delayed_work(system_power_efficient_wq, |
1240 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1241 | |
1242 | /* Scan all ports that need attention */ | |
1243 | kick_khubd(hub); | |
8e4ceb38 AS |
1244 | |
1245 | /* Allow autosuspend if it was suppressed */ | |
1246 | if (type <= HUB_INIT3) | |
1247 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
1248 | } |
1249 | ||
8520f380 AS |
1250 | /* Implement the continuations for the delays above */ |
1251 | static void hub_init_func2(struct work_struct *ws) | |
1252 | { | |
1253 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1254 | ||
1255 | hub_activate(hub, HUB_INIT2); | |
1256 | } | |
1257 | ||
1258 | static void hub_init_func3(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_INIT3); | |
1263 | } | |
1264 | ||
4330354f AS |
1265 | enum hub_quiescing_type { |
1266 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1267 | }; | |
1268 | ||
1269 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1270 | { | |
1271 | struct usb_device *hdev = hub->hdev; | |
1272 | int i; | |
1273 | ||
8520f380 AS |
1274 | cancel_delayed_work_sync(&hub->init_work); |
1275 | ||
4330354f AS |
1276 | /* khubd and related activity won't re-trigger */ |
1277 | hub->quiescing = 1; | |
1278 | ||
1279 | if (type != HUB_SUSPEND) { | |
1280 | /* Disconnect all the children */ | |
1281 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1282 | if (hub->ports[i]->child) |
1283 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1284 | } |
1285 | } | |
1286 | ||
1287 | /* Stop khubd and related activity */ | |
1288 | usb_kill_urb(hub->urb); | |
1289 | if (hub->has_indicators) | |
1290 | cancel_delayed_work_sync(&hub->leds); | |
1291 | if (hub->tt.hub) | |
036546bf | 1292 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1293 | } |
1294 | ||
600856c2 AS |
1295 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
1296 | { | |
1297 | int i; | |
1298 | ||
1299 | for (i = 0; i < hub->hdev->maxchild; ++i) | |
1300 | pm_runtime_barrier(&hub->ports[i]->dev); | |
1301 | } | |
1302 | ||
3eb14915 AS |
1303 | /* caller has locked the hub device */ |
1304 | static int hub_pre_reset(struct usb_interface *intf) | |
1305 | { | |
1306 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1307 | ||
4330354f | 1308 | hub_quiesce(hub, HUB_PRE_RESET); |
600856c2 AS |
1309 | hub->in_reset = 1; |
1310 | hub_pm_barrier_for_all_ports(hub); | |
f07600cf | 1311 | return 0; |
7d069b7d AS |
1312 | } |
1313 | ||
1314 | /* caller has locked the hub device */ | |
f07600cf | 1315 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1316 | { |
7de18d8b AS |
1317 | struct usb_hub *hub = usb_get_intfdata(intf); |
1318 | ||
600856c2 AS |
1319 | hub->in_reset = 0; |
1320 | hub_pm_barrier_for_all_ports(hub); | |
f2835219 | 1321 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1322 | return 0; |
7d069b7d AS |
1323 | } |
1324 | ||
1da177e4 LT |
1325 | static int hub_configure(struct usb_hub *hub, |
1326 | struct usb_endpoint_descriptor *endpoint) | |
1327 | { | |
b356b7c7 | 1328 | struct usb_hcd *hcd; |
1da177e4 LT |
1329 | struct usb_device *hdev = hub->hdev; |
1330 | struct device *hub_dev = hub->intfdev; | |
1331 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1332 | u16 wHubCharacteristics; |
1da177e4 | 1333 | unsigned int pipe; |
fa2a9566 | 1334 | int maxp, ret, i; |
7cbe5dca | 1335 | char *message = "out of memory"; |
430ee58e SAS |
1336 | unsigned unit_load; |
1337 | unsigned full_load; | |
d8521afe | 1338 | unsigned maxchild; |
1da177e4 | 1339 | |
d697cdda | 1340 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1341 | if (!hub->buffer) { |
1da177e4 LT |
1342 | ret = -ENOMEM; |
1343 | goto fail; | |
1344 | } | |
1345 | ||
1346 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1347 | if (!hub->status) { | |
1da177e4 LT |
1348 | ret = -ENOMEM; |
1349 | goto fail; | |
1350 | } | |
db90e7a1 | 1351 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
1352 | |
1353 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
1354 | if (!hub->descriptor) { | |
1da177e4 LT |
1355 | ret = -ENOMEM; |
1356 | goto fail; | |
1357 | } | |
1358 | ||
1359 | /* Request the entire hub descriptor. | |
1360 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
1361 | * but the hub can/will return fewer bytes here. | |
1362 | */ | |
dbe79bbe | 1363 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1364 | if (ret < 0) { |
1365 | message = "can't read hub descriptor"; | |
1366 | goto fail; | |
1367 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1368 | message = "hub has too many ports!"; | |
1369 | ret = -ENODEV; | |
1370 | goto fail; | |
769d7368 DL |
1371 | } else if (hub->descriptor->bNbrPorts == 0) { |
1372 | message = "hub doesn't have any ports!"; | |
1373 | ret = -ENODEV; | |
1374 | goto fail; | |
1da177e4 LT |
1375 | } |
1376 | ||
d8521afe DW |
1377 | maxchild = hub->descriptor->bNbrPorts; |
1378 | dev_info(hub_dev, "%d port%s detected\n", maxchild, | |
1379 | (maxchild == 1) ? "" : "s"); | |
1da177e4 | 1380 | |
d8521afe | 1381 | hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
ff823c79 | 1382 | if (!hub->ports) { |
7cbe5dca AS |
1383 | ret = -ENOMEM; |
1384 | goto fail; | |
1385 | } | |
1386 | ||
74ad9bd2 | 1387 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1388 | if (hub_is_superspeed(hdev)) { |
1389 | unit_load = 150; | |
1390 | full_load = 900; | |
1391 | } else { | |
1392 | unit_load = 100; | |
1393 | full_load = 500; | |
1394 | } | |
1da177e4 | 1395 | |
dbe79bbe JY |
1396 | /* FIXME for USB 3.0, skip for now */ |
1397 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1398 | !(hub_is_superspeed(hdev))) { | |
1da177e4 | 1399 | int i; |
469271f8 | 1400 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 | 1401 | |
d8521afe | 1402 | for (i = 0; i < maxchild; i++) |
dbe79bbe | 1403 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1404 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1405 | ? 'F' : 'R'; | |
d8521afe | 1406 | portstr[maxchild] = 0; |
1da177e4 LT |
1407 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
1408 | } else | |
1409 | dev_dbg(hub_dev, "standalone hub\n"); | |
1410 | ||
74ad9bd2 | 1411 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1412 | case HUB_CHAR_COMMON_LPSM: |
1413 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1414 | break; | |
1415 | case HUB_CHAR_INDV_PORT_LPSM: | |
1416 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1417 | break; | |
1418 | case HUB_CHAR_NO_LPSM: | |
1419 | case HUB_CHAR_LPSM: | |
1420 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1421 | break; | |
1da177e4 LT |
1422 | } |
1423 | ||
74ad9bd2 | 1424 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1425 | case HUB_CHAR_COMMON_OCPM: |
1426 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1427 | break; | |
1428 | case HUB_CHAR_INDV_PORT_OCPM: | |
1429 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1430 | break; | |
1431 | case HUB_CHAR_NO_OCPM: | |
1432 | case HUB_CHAR_OCPM: | |
1433 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1434 | break; | |
1da177e4 LT |
1435 | } |
1436 | ||
1437 | spin_lock_init (&hub->tt.lock); | |
1438 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1439 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1440 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1441 | case USB_HUB_PR_FS: |
1442 | break; | |
1443 | case USB_HUB_PR_HS_SINGLE_TT: | |
1444 | dev_dbg(hub_dev, "Single TT\n"); | |
1445 | hub->tt.hub = hdev; | |
1446 | break; | |
1447 | case USB_HUB_PR_HS_MULTI_TT: | |
1448 | ret = usb_set_interface(hdev, 0, 1); | |
1449 | if (ret == 0) { | |
1450 | dev_dbg(hub_dev, "TT per port\n"); | |
1451 | hub->tt.multi = 1; | |
1452 | } else | |
1453 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1454 | ret); | |
1455 | hub->tt.hub = hdev; | |
1456 | break; | |
1457 | case USB_HUB_PR_SS: | |
1458 | /* USB 3.0 hubs don't have a TT */ | |
1459 | break; | |
1460 | default: | |
1461 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1462 | hdev->descriptor.bDeviceProtocol); | |
1463 | break; | |
1da177e4 LT |
1464 | } |
1465 | ||
e09711ae | 1466 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1467 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1468 | case HUB_TTTT_8_BITS: |
1469 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1470 | hub->tt.think_time = 666; | |
e09711ae | 1471 | dev_dbg(hub_dev, "TT requires at most %d " |
1472 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1473 | 8, hub->tt.think_time); |
1474 | } | |
1475 | break; | |
1476 | case HUB_TTTT_16_BITS: | |
1477 | hub->tt.think_time = 666 * 2; | |
1478 | dev_dbg(hub_dev, "TT requires at most %d " | |
1479 | "FS bit times (%d ns)\n", | |
1480 | 16, hub->tt.think_time); | |
1481 | break; | |
1482 | case HUB_TTTT_24_BITS: | |
1483 | hub->tt.think_time = 666 * 3; | |
1484 | dev_dbg(hub_dev, "TT requires at most %d " | |
1485 | "FS bit times (%d ns)\n", | |
1486 | 24, hub->tt.think_time); | |
1487 | break; | |
1488 | case HUB_TTTT_32_BITS: | |
1489 | hub->tt.think_time = 666 * 4; | |
1490 | dev_dbg(hub_dev, "TT requires at most %d " | |
1491 | "FS bit times (%d ns)\n", | |
1492 | 32, hub->tt.think_time); | |
1493 | break; | |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1497 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1498 | hub->has_indicators = 1; |
1499 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1500 | } | |
1501 | ||
1502 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1503 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1504 | ||
1505 | /* power budgeting mostly matters with bus-powered hubs, | |
1506 | * and battery-powered root hubs (may provide just 8 mA). | |
1507 | */ | |
1508 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
15b7336e | 1509 | if (ret) { |
1da177e4 LT |
1510 | message = "can't get hub status"; |
1511 | goto fail; | |
1512 | } | |
430ee58e | 1513 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1514 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1515 | if (hcd->power_budget > 0) |
1516 | hdev->bus_mA = hcd->power_budget; | |
1517 | else | |
d8521afe | 1518 | hdev->bus_mA = full_load * maxchild; |
430ee58e SAS |
1519 | if (hdev->bus_mA >= full_load) |
1520 | hub->mA_per_port = full_load; | |
55c52718 AS |
1521 | else { |
1522 | hub->mA_per_port = hdev->bus_mA; | |
1523 | hub->limited_power = 1; | |
1524 | } | |
7d35b929 | 1525 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1526 | int remaining = hdev->bus_mA - |
1527 | hub->descriptor->bHubContrCurrent; | |
1528 | ||
1da177e4 LT |
1529 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1530 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1531 | hub->limited_power = 1; |
55c52718 | 1532 | |
d8521afe | 1533 | if (remaining < maxchild * unit_load) |
430ee58e | 1534 | dev_warn(hub_dev, |
55c52718 AS |
1535 | "insufficient power available " |
1536 | "to use all downstream ports\n"); | |
430ee58e SAS |
1537 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1538 | ||
55c52718 AS |
1539 | } else { /* Self-powered external hub */ |
1540 | /* FIXME: What about battery-powered external hubs that | |
1541 | * provide less current per port? */ | |
430ee58e | 1542 | hub->mA_per_port = full_load; |
7d35b929 | 1543 | } |
430ee58e | 1544 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1545 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1546 | hub->mA_per_port); | |
1da177e4 LT |
1547 | |
1548 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1549 | if (ret < 0) { | |
1550 | message = "can't get hub status"; | |
1551 | goto fail; | |
1552 | } | |
1553 | ||
1554 | /* local power status reports aren't always correct */ | |
1555 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1556 | dev_dbg(hub_dev, "local power source is %s\n", | |
1557 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1558 | ? "lost (inactive)" : "good"); | |
1559 | ||
74ad9bd2 | 1560 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1561 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1562 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1563 | ||
88fafff9 | 1564 | /* set up the interrupt endpoint |
1565 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1566 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1567 | * to send more data (and thus cause overflow). For root hubs, | |
1568 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1569 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1570 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1571 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1572 | ||
1573 | if (maxp > sizeof(*hub->buffer)) | |
1574 | maxp = sizeof(*hub->buffer); | |
1575 | ||
1576 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1577 | if (!hub->urb) { | |
1da177e4 LT |
1578 | ret = -ENOMEM; |
1579 | goto fail; | |
1580 | } | |
1581 | ||
1582 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1583 | hub, endpoint->bInterval); | |
1da177e4 LT |
1584 | |
1585 | /* maybe cycle the hub leds */ | |
1586 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1587 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1588 | |
d8521afe DW |
1589 | mutex_lock(&usb_port_peer_mutex); |
1590 | for (i = 0; i < maxchild; i++) { | |
e58547eb KM |
1591 | ret = usb_hub_create_port_device(hub, i + 1); |
1592 | if (ret < 0) { | |
fa2a9566 LT |
1593 | dev_err(hub->intfdev, |
1594 | "couldn't create port%d device.\n", i + 1); | |
d8521afe | 1595 | break; |
e58547eb KM |
1596 | } |
1597 | } | |
d8521afe | 1598 | hdev->maxchild = i; |
e3d10505 DW |
1599 | for (i = 0; i < hdev->maxchild; i++) { |
1600 | struct usb_port *port_dev = hub->ports[i]; | |
1601 | ||
1602 | pm_runtime_put(&port_dev->dev); | |
1603 | } | |
1604 | ||
d8521afe DW |
1605 | mutex_unlock(&usb_port_peer_mutex); |
1606 | if (ret < 0) | |
1607 | goto fail; | |
fa2a9566 | 1608 | |
e3d95580 DW |
1609 | /* Update the HCD's internal representation of this hub before khubd |
1610 | * starts getting port status changes for devices under the hub. | |
1611 | */ | |
1612 | if (hcd->driver->update_hub_device) { | |
1613 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1614 | &hub->tt, GFP_KERNEL); | |
1615 | if (ret < 0) { | |
1616 | message = "can't update HCD hub info"; | |
1617 | goto fail; | |
1618 | } | |
1619 | } | |
1620 | ||
d2123fd9 LT |
1621 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1622 | ||
f2835219 | 1623 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1624 | return 0; |
1625 | ||
1626 | fail: | |
1627 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1628 | message, ret); | |
1629 | /* hub_disconnect() frees urb and descriptor */ | |
1630 | return ret; | |
1631 | } | |
1632 | ||
e8054854 AS |
1633 | static void hub_release(struct kref *kref) |
1634 | { | |
1635 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1636 | ||
1637 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1638 | kfree(hub); | |
1639 | } | |
1640 | ||
1da177e4 LT |
1641 | static unsigned highspeed_hubs; |
1642 | ||
1643 | static void hub_disconnect(struct usb_interface *intf) | |
1644 | { | |
8816230e | 1645 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1646 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1647 | int port1; |
fa2a9566 | 1648 | |
e8054854 AS |
1649 | /* Take the hub off the event list and don't let it be added again */ |
1650 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1651 | if (!list_empty(&hub->event_list)) { |
1652 | list_del_init(&hub->event_list); | |
1653 | usb_autopm_put_interface_no_suspend(intf); | |
1654 | } | |
e8054854 AS |
1655 | hub->disconnected = 1; |
1656 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1657 | |
7de18d8b AS |
1658 | /* Disconnect all children and quiesce the hub */ |
1659 | hub->error = 0; | |
4330354f | 1660 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1661 | |
d8521afe DW |
1662 | mutex_lock(&usb_port_peer_mutex); |
1663 | ||
543d7784 AS |
1664 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1665 | spin_lock_irq(&device_state_lock); | |
1666 | port1 = hdev->maxchild; | |
1667 | hdev->maxchild = 0; | |
1668 | usb_set_intfdata(intf, NULL); | |
1669 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1670 | |
543d7784 AS |
1671 | for (; port1 > 0; --port1) |
1672 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1673 | |
d8521afe DW |
1674 | mutex_unlock(&usb_port_peer_mutex); |
1675 | ||
e8054854 | 1676 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1677 | highspeed_hubs--; |
1678 | ||
1da177e4 | 1679 | usb_free_urb(hub->urb); |
fa2a9566 | 1680 | kfree(hub->ports); |
1bc3c9e1 | 1681 | kfree(hub->descriptor); |
1bc3c9e1 | 1682 | kfree(hub->status); |
d697cdda | 1683 | kfree(hub->buffer); |
1da177e4 | 1684 | |
971fcd49 | 1685 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1686 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1687 | } |
1688 | ||
1689 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1690 | { | |
1691 | struct usb_host_interface *desc; | |
1692 | struct usb_endpoint_descriptor *endpoint; | |
1693 | struct usb_device *hdev; | |
1694 | struct usb_hub *hub; | |
1695 | ||
1696 | desc = intf->cur_altsetting; | |
1697 | hdev = interface_to_usbdev(intf); | |
1698 | ||
596d789a ML |
1699 | /* |
1700 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1701 | * based on the below considerations: | |
1702 | * | |
1703 | * - Unlike other drivers, the hub driver does not rely on the | |
1704 | * autosuspend delay to provide enough time to handle a wakeup | |
1705 | * event, and the submitted status URB is just to check future | |
1706 | * change on hub downstream ports, so it is safe to do it. | |
1707 | * | |
1708 | * - The patch might cause one or more auto supend/resume for | |
1709 | * below very rare devices when they are plugged into hub | |
1710 | * first time: | |
1711 | * | |
1712 | * devices having trouble initializing, and disconnect | |
1713 | * themselves from the bus and then reconnect a second | |
1714 | * or so later | |
1715 | * | |
1716 | * devices just for downloading firmware, and disconnects | |
1717 | * themselves after completing it | |
1718 | * | |
1719 | * For these quite rare devices, their drivers may change the | |
1720 | * autosuspend delay of their parent hub in the probe() to one | |
1721 | * appropriate value to avoid the subtle problem if someone | |
1722 | * does care it. | |
1723 | * | |
1724 | * - The patch may cause one or more auto suspend/resume on | |
1725 | * hub during running 'lsusb', but it is probably too | |
1726 | * infrequent to worry about. | |
1727 | * | |
1728 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1729 | * suspend timer for hub, also may decrease power consumption | |
1730 | * of USB bus. | |
bdd405d2 RQ |
1731 | * |
1732 | * - If user has indicated to prevent autosuspend by passing | |
1733 | * usbcore.autosuspend = -1 then keep autosuspend disabled. | |
596d789a | 1734 | */ |
a9ef803d | 1735 | #ifdef CONFIG_PM_RUNTIME |
bdd405d2 RQ |
1736 | if (hdev->dev.power.autosuspend_delay >= 0) |
1737 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
a9ef803d | 1738 | #endif |
596d789a | 1739 | |
8ef42ddd AS |
1740 | /* |
1741 | * Hubs have proper suspend/resume support, except for root hubs | |
1742 | * where the controller driver doesn't have bus_suspend and | |
1743 | * bus_resume methods. | |
1744 | */ | |
1745 | if (hdev->parent) { /* normal device */ | |
1746 | usb_enable_autosuspend(hdev); | |
1747 | } else { /* root hub */ | |
1748 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; | |
1749 | ||
1750 | if (drv->bus_suspend && drv->bus_resume) | |
1751 | usb_enable_autosuspend(hdev); | |
1752 | } | |
088f7fec | 1753 | |
38f3ad5e | 1754 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1755 | dev_err(&intf->dev, |
1756 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1757 | return -E2BIG; |
1758 | } | |
1759 | ||
89ccbdc9 DB |
1760 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1761 | if (hdev->parent) { | |
1762 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1763 | return -ENODEV; | |
1764 | } | |
1765 | #endif | |
1766 | ||
1da177e4 LT |
1767 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1768 | /* specs is not defined, but it works */ | |
1769 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1770 | (desc->desc.bInterfaceSubClass != 1)) { | |
1771 | descriptor_error: | |
1772 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1773 | return -EIO; | |
1774 | } | |
1775 | ||
1776 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1777 | if (desc->desc.bNumEndpoints != 1) | |
1778 | goto descriptor_error; | |
1779 | ||
1780 | endpoint = &desc->endpoint[0].desc; | |
1781 | ||
fbf81c29 LFC |
1782 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1783 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1784 | goto descriptor_error; |
1785 | ||
1786 | /* We found a hub */ | |
1787 | dev_info (&intf->dev, "USB hub found\n"); | |
1788 | ||
0a1ef3b5 | 1789 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1790 | if (!hub) { |
1791 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1792 | return -ENOMEM; | |
1793 | } | |
1794 | ||
e8054854 | 1795 | kref_init(&hub->kref); |
1da177e4 LT |
1796 | INIT_LIST_HEAD(&hub->event_list); |
1797 | hub->intfdev = &intf->dev; | |
1798 | hub->hdev = hdev; | |
c4028958 | 1799 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1800 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1801 | usb_get_intf(intf); |
1da177e4 LT |
1802 | |
1803 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1804 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1805 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1806 | |
1807 | if (hdev->speed == USB_SPEED_HIGH) | |
1808 | highspeed_hubs++; | |
1809 | ||
e6f30dea ML |
1810 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1811 | hub->quirk_check_port_auto_suspend = 1; | |
1812 | ||
1da177e4 LT |
1813 | if (hub_configure(hub, endpoint) >= 0) |
1814 | return 0; | |
1815 | ||
1816 | hub_disconnect (intf); | |
1817 | return -ENODEV; | |
1818 | } | |
1819 | ||
1820 | static int | |
1821 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1822 | { | |
1823 | struct usb_device *hdev = interface_to_usbdev (intf); | |
ad493e5e | 1824 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1825 | |
1826 | /* assert ifno == 0 (part of hub spec) */ | |
1827 | switch (code) { | |
1828 | case USBDEVFS_HUB_PORTINFO: { | |
1829 | struct usbdevfs_hub_portinfo *info = user_data; | |
1830 | int i; | |
1831 | ||
1832 | spin_lock_irq(&device_state_lock); | |
1833 | if (hdev->devnum <= 0) | |
1834 | info->nports = 0; | |
1835 | else { | |
1836 | info->nports = hdev->maxchild; | |
1837 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1838 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1839 | info->port[i] = 0; |
1840 | else | |
1841 | info->port[i] = | |
ff823c79 | 1842 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1843 | } |
1844 | } | |
1845 | spin_unlock_irq(&device_state_lock); | |
1846 | ||
1847 | return info->nports + 1; | |
1848 | } | |
1849 | ||
1850 | default: | |
1851 | return -ENOSYS; | |
1852 | } | |
1853 | } | |
1854 | ||
7cbe5dca AS |
1855 | /* |
1856 | * Allow user programs to claim ports on a hub. When a device is attached | |
1857 | * to one of these "claimed" ports, the program will "own" the device. | |
1858 | */ | |
1859 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 1860 | struct usb_dev_state ***ppowner) |
7cbe5dca | 1861 | { |
41341261 MN |
1862 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1863 | ||
7cbe5dca AS |
1864 | if (hdev->state == USB_STATE_NOTATTACHED) |
1865 | return -ENODEV; | |
1866 | if (port1 == 0 || port1 > hdev->maxchild) | |
1867 | return -EINVAL; | |
1868 | ||
41341261 | 1869 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1870 | * will always have maxchild equal to 0. |
1871 | */ | |
41341261 | 1872 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1873 | return 0; |
1874 | } | |
1875 | ||
1876 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 | 1877 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1878 | struct usb_dev_state *owner) |
7cbe5dca AS |
1879 | { |
1880 | int rc; | |
9b6f0c4b | 1881 | struct usb_dev_state **powner; |
7cbe5dca AS |
1882 | |
1883 | rc = find_port_owner(hdev, port1, &powner); | |
1884 | if (rc) | |
1885 | return rc; | |
1886 | if (*powner) | |
1887 | return -EBUSY; | |
1888 | *powner = owner; | |
1889 | return rc; | |
1890 | } | |
6080cd0e | 1891 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
7cbe5dca | 1892 | |
336c5c31 | 1893 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1894 | struct usb_dev_state *owner) |
7cbe5dca AS |
1895 | { |
1896 | int rc; | |
9b6f0c4b | 1897 | struct usb_dev_state **powner; |
7cbe5dca AS |
1898 | |
1899 | rc = find_port_owner(hdev, port1, &powner); | |
1900 | if (rc) | |
1901 | return rc; | |
1902 | if (*powner != owner) | |
1903 | return -ENOENT; | |
1904 | *powner = NULL; | |
1905 | return rc; | |
1906 | } | |
6080cd0e | 1907 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
7cbe5dca | 1908 | |
9b6f0c4b | 1909 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
7cbe5dca | 1910 | { |
ad493e5e | 1911 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1912 | int n; |
7cbe5dca | 1913 | |
fa2a9566 LT |
1914 | for (n = 0; n < hdev->maxchild; n++) { |
1915 | if (hub->ports[n]->port_owner == owner) | |
1916 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1917 | } |
fa2a9566 | 1918 | |
7cbe5dca AS |
1919 | } |
1920 | ||
1921 | /* The caller must hold udev's lock */ | |
1922 | bool usb_device_is_owned(struct usb_device *udev) | |
1923 | { | |
1924 | struct usb_hub *hub; | |
1925 | ||
1926 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1927 | return false; | |
ad493e5e | 1928 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1929 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1930 | } |
1931 | ||
1da177e4 LT |
1932 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1933 | { | |
ad493e5e | 1934 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1935 | int i; |
1936 | ||
1937 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1938 | if (hub->ports[i]->child) |
1939 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1940 | } |
9bbdf1e0 | 1941 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1942 | udev->active_duration -= jiffies; |
1da177e4 LT |
1943 | udev->state = USB_STATE_NOTATTACHED; |
1944 | } | |
1945 | ||
1946 | /** | |
1947 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1948 | * @udev: pointer to device whose state should be changed | |
1949 | * @new_state: new state value to be stored | |
1950 | * | |
1951 | * udev->state is _not_ fully protected by the device lock. Although | |
1952 | * most transitions are made only while holding the lock, the state can | |
1953 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1954 | * is so that devices can be marked as disconnected as soon as possible, | |
1955 | * without having to wait for any semaphores to be released. As a result, | |
1956 | * all changes to any device's state must be protected by the | |
1957 | * device_state_lock spinlock. | |
1958 | * | |
1959 | * Once a device has been added to the device tree, all changes to its state | |
1960 | * should be made using this routine. The state should _not_ be set directly. | |
1961 | * | |
1962 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1963 | * Otherwise udev->state is set to new_state, and if new_state is | |
1964 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1965 | * to USB_STATE_NOTATTACHED. | |
1966 | */ | |
1967 | void usb_set_device_state(struct usb_device *udev, | |
1968 | enum usb_device_state new_state) | |
1969 | { | |
1970 | unsigned long flags; | |
4681b171 | 1971 | int wakeup = -1; |
1da177e4 LT |
1972 | |
1973 | spin_lock_irqsave(&device_state_lock, flags); | |
1974 | if (udev->state == USB_STATE_NOTATTACHED) | |
1975 | ; /* do nothing */ | |
b94dc6b5 | 1976 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1977 | |
1978 | /* root hub wakeup capabilities are managed out-of-band | |
1979 | * and may involve silicon errata ... ignore them here. | |
1980 | */ | |
1981 | if (udev->parent) { | |
645daaab AS |
1982 | if (udev->state == USB_STATE_SUSPENDED |
1983 | || new_state == USB_STATE_SUSPENDED) | |
1984 | ; /* No change to wakeup settings */ | |
1985 | else if (new_state == USB_STATE_CONFIGURED) | |
4681b171 RW |
1986 | wakeup = udev->actconfig->desc.bmAttributes |
1987 | & USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1988 | else |
4681b171 | 1989 | wakeup = 0; |
fb669cc0 | 1990 | } |
15123006 SS |
1991 | if (udev->state == USB_STATE_SUSPENDED && |
1992 | new_state != USB_STATE_SUSPENDED) | |
1993 | udev->active_duration -= jiffies; | |
1994 | else if (new_state == USB_STATE_SUSPENDED && | |
1995 | udev->state != USB_STATE_SUSPENDED) | |
1996 | udev->active_duration += jiffies; | |
645daaab | 1997 | udev->state = new_state; |
b94dc6b5 | 1998 | } else |
1da177e4 LT |
1999 | recursively_mark_NOTATTACHED(udev); |
2000 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
2001 | if (wakeup >= 0) |
2002 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 2003 | } |
6da9c990 | 2004 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 2005 | |
8af548dc | 2006 | /* |
3b29b68b AS |
2007 | * Choose a device number. |
2008 | * | |
2009 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
2010 | * USB-2.0 buses they are also used as device addresses, however on | |
2011 | * USB-3.0 buses the address is assigned by the controller hardware | |
2012 | * and it usually is not the same as the device number. | |
2013 | * | |
8af548dc IPG |
2014 | * WUSB devices are simple: they have no hubs behind, so the mapping |
2015 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
2016 | * life of the device connection logic in | |
2017 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
2018 | * handshake we need to assign a temporary address in the unauthorized | |
2019 | * space. For simplicity we use the first virtual port number found to | |
2020 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
2021 | * and that becomes it's address [X < 128] or its unauthorized address | |
2022 | * [X | 0x80]. | |
2023 | * | |
2024 | * We add 1 as an offset to the one-based USB-stack port number | |
2025 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
2026 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
2027 | * uses always #1 for the root hub of the controller. So USB stack's | |
2028 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
2029 | * |
2030 | * Devices connected under xHCI are not as simple. The host controller | |
2031 | * supports virtualization, so the hardware assigns device addresses and | |
2032 | * the HCD must setup data structures before issuing a set address | |
2033 | * command to the hardware. | |
8af548dc | 2034 | */ |
3b29b68b | 2035 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
2036 | { |
2037 | int devnum; | |
2038 | struct usb_bus *bus = udev->bus; | |
2039 | ||
2040 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
2041 | if (udev->wusb) { |
2042 | devnum = udev->portnum + 1; | |
2043 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
2044 | } else { | |
2045 | /* Try to allocate the next devnum beginning at | |
2046 | * bus->devnum_next. */ | |
2047 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
2048 | bus->devnum_next); | |
2049 | if (devnum >= 128) | |
2050 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
2051 | 128, 1); | |
469271f8 | 2052 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 2053 | } |
1da177e4 LT |
2054 | if (devnum < 128) { |
2055 | set_bit(devnum, bus->devmap.devicemap); | |
2056 | udev->devnum = devnum; | |
2057 | } | |
2058 | } | |
2059 | ||
3b29b68b | 2060 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2061 | { |
2062 | if (udev->devnum > 0) { | |
2063 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2064 | udev->devnum = -1; | |
2065 | } | |
2066 | } | |
2067 | ||
3b29b68b | 2068 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2069 | { |
2070 | /* The address for a WUSB device is managed by wusbcore. */ | |
2071 | if (!udev->wusb) | |
2072 | udev->devnum = devnum; | |
2073 | } | |
2074 | ||
f7410ced HX |
2075 | static void hub_free_dev(struct usb_device *udev) |
2076 | { | |
2077 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2078 | ||
2079 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2080 | if (hcd->driver->free_dev && udev->parent) | |
2081 | hcd->driver->free_dev(hcd, udev); | |
2082 | } | |
2083 | ||
7027df36 DW |
2084 | static void hub_disconnect_children(struct usb_device *udev) |
2085 | { | |
2086 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2087 | int i; | |
2088 | ||
2089 | /* Free up all the children before we remove this device */ | |
2090 | for (i = 0; i < udev->maxchild; i++) { | |
2091 | if (hub->ports[i]->child) | |
2092 | usb_disconnect(&hub->ports[i]->child); | |
2093 | } | |
2094 | } | |
2095 | ||
1da177e4 LT |
2096 | /** |
2097 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2098 | * @pdev: pointer to device being disconnected | |
2099 | * Context: !in_interrupt () | |
2100 | * | |
2101 | * Something got disconnected. Get rid of it and all of its children. | |
2102 | * | |
2103 | * If *pdev is a normal device then the parent hub must already be locked. | |
db8f2aa3 BH |
2104 | * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, |
2105 | * which protects the set of root hubs as well as the list of buses. | |
1da177e4 LT |
2106 | * |
2107 | * Only hub drivers (including virtual root hub drivers for host | |
2108 | * controllers) should ever call this. | |
2109 | * | |
2110 | * This call is synchronous, and may not be used in an interrupt context. | |
2111 | */ | |
2112 | void usb_disconnect(struct usb_device **pdev) | |
2113 | { | |
7027df36 DW |
2114 | struct usb_port *port_dev = NULL; |
2115 | struct usb_device *udev = *pdev; | |
5b1dc209 PC |
2116 | struct usb_hub *hub = NULL; |
2117 | int port1 = 1; | |
1da177e4 | 2118 | |
1da177e4 LT |
2119 | /* mark the device as inactive, so any further urb submissions for |
2120 | * this device (and any of its children) will fail immediately. | |
25985edc | 2121 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2122 | */ |
2123 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2124 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2125 | udev->devnum); | |
1da177e4 | 2126 | |
9ad3d6cc AS |
2127 | usb_lock_device(udev); |
2128 | ||
7027df36 | 2129 | hub_disconnect_children(udev); |
1da177e4 LT |
2130 | |
2131 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2132 | * cleaning up all state associated with the current configuration | |
2133 | * so that the hardware is now fully quiesced. | |
2134 | */ | |
782da727 | 2135 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 2136 | usb_disable_device(udev, 0); |
cde217a5 | 2137 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2138 | |
fde26380 | 2139 | if (udev->parent) { |
7027df36 DW |
2140 | port1 = udev->portnum; |
2141 | hub = usb_hub_to_struct_hub(udev->parent); | |
2142 | port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2143 | |
2144 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2145 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2146 | |
7027df36 DW |
2147 | /* |
2148 | * As usb_port_runtime_resume() de-references udev, make | |
2149 | * sure no resumes occur during removal | |
2150 | */ | |
2151 | if (!test_and_set_bit(port1, hub->child_usage_bits)) | |
2152 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2153 | } |
2154 | ||
3b23dd6f | 2155 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2156 | usb_unlock_device(udev); |
2157 | ||
2158 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2159 | * for de-configuring the device and invoking the remove-device |
2160 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2161 | */ |
2162 | device_del(&udev->dev); | |
3099e75a | 2163 | |
782da727 | 2164 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2165 | * (or root_hub) pointer. |
2166 | */ | |
3b29b68b | 2167 | release_devnum(udev); |
1da177e4 LT |
2168 | |
2169 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2170 | spin_lock_irq(&device_state_lock); | |
2171 | *pdev = NULL; | |
2172 | spin_unlock_irq(&device_state_lock); | |
2173 | ||
7027df36 DW |
2174 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
2175 | pm_runtime_put(&port_dev->dev); | |
2176 | ||
f7410ced HX |
2177 | hub_free_dev(udev); |
2178 | ||
782da727 | 2179 | put_device(&udev->dev); |
1da177e4 LT |
2180 | } |
2181 | ||
f2a383e4 | 2182 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2183 | static void show_string(struct usb_device *udev, char *id, char *string) |
2184 | { | |
2185 | if (!string) | |
2186 | return; | |
f2ec522e | 2187 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2188 | } |
2189 | ||
f2a383e4 GKH |
2190 | static void announce_device(struct usb_device *udev) |
2191 | { | |
2192 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2193 | le16_to_cpu(udev->descriptor.idVendor), | |
2194 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2195 | dev_info(&udev->dev, |
2196 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2197 | udev->descriptor.iManufacturer, |
2198 | udev->descriptor.iProduct, | |
2199 | udev->descriptor.iSerialNumber); | |
2200 | show_string(udev, "Product", udev->product); | |
2201 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2202 | show_string(udev, "SerialNumber", udev->serial); | |
2203 | } | |
1da177e4 | 2204 | #else |
f2a383e4 | 2205 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2206 | #endif |
2207 | ||
1da177e4 LT |
2208 | #ifdef CONFIG_USB_OTG |
2209 | #include "otg_whitelist.h" | |
2210 | #endif | |
2211 | ||
3ede760f | 2212 | /** |
8d8558d1 | 2213 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2214 | * @udev: newly addressed device (in ADDRESS state) |
2215 | * | |
8d8558d1 | 2216 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2217 | * |
2218 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2219 | */ |
8d8558d1 | 2220 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2221 | { |
d9d16e8a | 2222 | int err = 0; |
1da177e4 LT |
2223 | |
2224 | #ifdef CONFIG_USB_OTG | |
2225 | /* | |
2226 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2227 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2228 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2229 | */ | |
2230 | if (!udev->bus->is_b_host | |
2231 | && udev->config | |
2232 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2233 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
2234 | struct usb_bus *bus = udev->bus; |
2235 | ||
2236 | /* descriptor may appear anywhere in config */ | |
2237 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
2238 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2239 | USB_DT_OTG, (void **) &desc) == 0) { | |
2240 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 2241 | unsigned port1 = udev->portnum; |
fc849b85 | 2242 | |
1da177e4 LT |
2243 | dev_info(&udev->dev, |
2244 | "Dual-Role OTG device on %sHNP port\n", | |
2245 | (port1 == bus->otg_port) | |
2246 | ? "" : "non-"); | |
2247 | ||
2248 | /* enable HNP before suspend, it's simpler */ | |
2249 | if (port1 == bus->otg_port) | |
2250 | bus->b_hnp_enable = 1; | |
2251 | err = usb_control_msg(udev, | |
2252 | usb_sndctrlpipe(udev, 0), | |
2253 | USB_REQ_SET_FEATURE, 0, | |
2254 | bus->b_hnp_enable | |
2255 | ? USB_DEVICE_B_HNP_ENABLE | |
2256 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2257 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2258 | if (err < 0) { | |
2259 | /* OTG MESSAGE: report errors here, | |
2260 | * customize to match your product. | |
2261 | */ | |
2262 | dev_info(&udev->dev, | |
b9cef6c3 | 2263 | "can't set HNP mode: %d\n", |
1da177e4 LT |
2264 | err); |
2265 | bus->b_hnp_enable = 0; | |
2266 | } | |
2267 | } | |
2268 | } | |
2269 | } | |
2270 | ||
2271 | if (!is_targeted(udev)) { | |
2272 | ||
2273 | /* Maybe it can talk to us, though we can't talk to it. | |
2274 | * (Includes HNP test device.) | |
2275 | */ | |
2276 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 2277 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
2278 | if (err < 0) |
2279 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2280 | } | |
ffcdc18d | 2281 | err = -ENOTSUPP; |
1da177e4 LT |
2282 | goto fail; |
2283 | } | |
d9d16e8a | 2284 | fail: |
1da177e4 | 2285 | #endif |
d9d16e8a IPG |
2286 | return err; |
2287 | } | |
2288 | ||
2289 | ||
2290 | /** | |
8d8558d1 | 2291 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2292 | * @udev: newly addressed device (in ADDRESS state) |
2293 | * | |
2294 | * This is only called by usb_new_device() and usb_authorize_device() | |
2295 | * and FIXME -- all comments that apply to them apply here wrt to | |
2296 | * environment. | |
2297 | * | |
2298 | * If the device is WUSB and not authorized, we don't attempt to read | |
2299 | * the string descriptors, as they will be errored out by the device | |
2300 | * until it has been authorized. | |
626f090c YB |
2301 | * |
2302 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2303 | */ |
8d8558d1 | 2304 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2305 | { |
2306 | int err; | |
1da177e4 | 2307 | |
d9d16e8a IPG |
2308 | if (udev->config == NULL) { |
2309 | err = usb_get_configuration(udev); | |
2310 | if (err < 0) { | |
e9e88fb7 AS |
2311 | if (err != -ENODEV) |
2312 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2313 | err); | |
80da2e0d | 2314 | return err; |
d9d16e8a IPG |
2315 | } |
2316 | } | |
83e83ecb TP |
2317 | |
2318 | /* read the standard strings and cache them if present */ | |
2319 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2320 | udev->manufacturer = usb_cache_string(udev, | |
2321 | udev->descriptor.iManufacturer); | |
2322 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2323 | ||
8d8558d1 | 2324 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2325 | if (err < 0) |
2326 | return err; | |
2327 | ||
2328 | usb_detect_interface_quirks(udev); | |
2329 | ||
2330 | return 0; | |
d9d16e8a IPG |
2331 | } |
2332 | ||
d35e70d5 MG |
2333 | static void set_usb_port_removable(struct usb_device *udev) |
2334 | { | |
2335 | struct usb_device *hdev = udev->parent; | |
2336 | struct usb_hub *hub; | |
2337 | u8 port = udev->portnum; | |
2338 | u16 wHubCharacteristics; | |
2339 | bool removable = true; | |
2340 | ||
2341 | if (!hdev) | |
2342 | return; | |
2343 | ||
ad493e5e | 2344 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 MG |
2345 | |
2346 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
2347 | ||
2348 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2349 | return; | |
2350 | ||
2351 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2352 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2353 | & (1 << port)) | |
d35e70d5 MG |
2354 | removable = false; |
2355 | } else { | |
2356 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2357 | removable = false; | |
2358 | } | |
2359 | ||
2360 | if (removable) | |
2361 | udev->removable = USB_DEVICE_REMOVABLE; | |
2362 | else | |
2363 | udev->removable = USB_DEVICE_FIXED; | |
a4204ff0 DW |
2364 | |
2365 | /* | |
2366 | * Platform firmware may have populated an alternative value for | |
2367 | * removable. If the parent port has a known connect_type use | |
2368 | * that instead. | |
2369 | */ | |
2370 | switch (hub->ports[udev->portnum - 1]->connect_type) { | |
2371 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: | |
2372 | udev->removable = USB_DEVICE_REMOVABLE; | |
2373 | break; | |
2374 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
2375 | udev->removable = USB_DEVICE_FIXED; | |
2376 | break; | |
2377 | default: /* use what was set above */ | |
2378 | break; | |
2379 | } | |
d35e70d5 | 2380 | } |
d9d16e8a IPG |
2381 | |
2382 | /** | |
2383 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2384 | * @udev: newly addressed device (in ADDRESS state) | |
2385 | * | |
8d8558d1 AS |
2386 | * This is called with devices which have been detected but not fully |
2387 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2388 | * for any device configuration. The caller must have locked either |
2389 | * the parent hub (if udev is a normal device) or else the | |
2390 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
2391 | * udev has already been installed, but udev is not yet visible through | |
2392 | * sysfs or other filesystem code. | |
2393 | * | |
d9d16e8a IPG |
2394 | * This call is synchronous, and may not be used in an interrupt context. |
2395 | * | |
2396 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2397 | * |
2398 | * Return: Whether the device is configured properly or not. Zero if the | |
2399 | * interface was registered with the driver core; else a negative errno | |
2400 | * value. | |
2401 | * | |
d9d16e8a IPG |
2402 | */ |
2403 | int usb_new_device(struct usb_device *udev) | |
2404 | { | |
2405 | int err; | |
2406 | ||
16985408 | 2407 | if (udev->parent) { |
16985408 DS |
2408 | /* Initialize non-root-hub device wakeup to disabled; |
2409 | * device (un)configuration controls wakeup capable | |
2410 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2411 | */ | |
2412 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2413 | } |
2414 | ||
9bbdf1e0 AS |
2415 | /* Tell the runtime-PM framework the device is active */ |
2416 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2417 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2418 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2419 | pm_runtime_enable(&udev->dev); |
2420 | ||
c08512c7 AS |
2421 | /* By default, forbid autosuspend for all devices. It will be |
2422 | * allowed for hubs during binding. | |
2423 | */ | |
2424 | usb_disable_autosuspend(udev); | |
2425 | ||
8d8558d1 | 2426 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2427 | if (err < 0) |
2428 | goto fail; | |
c6515272 SS |
2429 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2430 | udev->devnum, udev->bus->busnum, | |
2431 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2432 | /* export the usbdev device-node for libusb */ |
2433 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2434 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2435 | ||
6cd13201 AS |
2436 | /* Tell the world! */ |
2437 | announce_device(udev); | |
195af2cc | 2438 | |
b04b3156 TT |
2439 | if (udev->serial) |
2440 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2441 | if (udev->product) | |
2442 | add_device_randomness(udev->product, strlen(udev->product)); | |
2443 | if (udev->manufacturer) | |
2444 | add_device_randomness(udev->manufacturer, | |
2445 | strlen(udev->manufacturer)); | |
2446 | ||
927bc916 | 2447 | device_enable_async_suspend(&udev->dev); |
d35e70d5 | 2448 | |
a4204ff0 | 2449 | /* check whether the hub or firmware marks this port as non-removable */ |
d35e70d5 MG |
2450 | if (udev->parent) |
2451 | set_usb_port_removable(udev); | |
2452 | ||
782da727 | 2453 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2454 | * for configuring the device and invoking the add-device |
2455 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2456 | */ |
9f8b17e6 | 2457 | err = device_add(&udev->dev); |
1da177e4 LT |
2458 | if (err) { |
2459 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2460 | goto fail; | |
2461 | } | |
9ad3d6cc | 2462 | |
fde26380 LT |
2463 | /* Create link files between child device and usb port device. */ |
2464 | if (udev->parent) { | |
ad493e5e | 2465 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
d5c3834e DW |
2466 | int port1 = udev->portnum; |
2467 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2468 | |
2469 | err = sysfs_create_link(&udev->dev.kobj, | |
2470 | &port_dev->dev.kobj, "port"); | |
2471 | if (err) | |
2472 | goto fail; | |
2473 | ||
2474 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2475 | &udev->dev.kobj, "device"); | |
2476 | if (err) { | |
2477 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2478 | goto fail; | |
2479 | } | |
971fcd49 | 2480 | |
d5c3834e DW |
2481 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
2482 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2483 | } |
2484 | ||
3b23dd6f | 2485 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2486 | usb_mark_last_busy(udev); |
2487 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2488 | return err; |
1da177e4 LT |
2489 | |
2490 | fail: | |
2491 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2492 | pm_runtime_disable(&udev->dev); |
2493 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2494 | return err; |
1da177e4 LT |
2495 | } |
2496 | ||
93993a0a IPG |
2497 | |
2498 | /** | |
fd39c86b RD |
2499 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2500 | * @usb_dev: USB device | |
2501 | * | |
2502 | * Move the USB device to a very basic state where interfaces are disabled | |
2503 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2504 | * |
2505 | * We share a lock (that we have) with device_del(), so we need to | |
2506 | * defer its call. | |
626f090c YB |
2507 | * |
2508 | * Return: 0. | |
93993a0a IPG |
2509 | */ |
2510 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2511 | { | |
93993a0a IPG |
2512 | usb_lock_device(usb_dev); |
2513 | if (usb_dev->authorized == 0) | |
2514 | goto out_unauthorized; | |
da307123 | 2515 | |
93993a0a IPG |
2516 | usb_dev->authorized = 0; |
2517 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2518 | |
93993a0a IPG |
2519 | out_unauthorized: |
2520 | usb_unlock_device(usb_dev); | |
2521 | return 0; | |
2522 | } | |
2523 | ||
2524 | ||
2525 | int usb_authorize_device(struct usb_device *usb_dev) | |
2526 | { | |
2527 | int result = 0, c; | |
da307123 | 2528 | |
93993a0a IPG |
2529 | usb_lock_device(usb_dev); |
2530 | if (usb_dev->authorized == 1) | |
2531 | goto out_authorized; | |
da307123 | 2532 | |
93993a0a IPG |
2533 | result = usb_autoresume_device(usb_dev); |
2534 | if (result < 0) { | |
2535 | dev_err(&usb_dev->dev, | |
2536 | "can't autoresume for authorization: %d\n", result); | |
2537 | goto error_autoresume; | |
2538 | } | |
2539 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2540 | if (result < 0) { | |
2541 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2542 | "authorization: %d\n", result); | |
2543 | goto error_device_descriptor; | |
2544 | } | |
da307123 | 2545 | |
93993a0a | 2546 | usb_dev->authorized = 1; |
93993a0a IPG |
2547 | /* Choose and set the configuration. This registers the interfaces |
2548 | * with the driver core and lets interface drivers bind to them. | |
2549 | */ | |
b5ea060f | 2550 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2551 | if (c >= 0) { |
2552 | result = usb_set_configuration(usb_dev, c); | |
2553 | if (result) { | |
2554 | dev_err(&usb_dev->dev, | |
2555 | "can't set config #%d, error %d\n", c, result); | |
2556 | /* This need not be fatal. The user can try to | |
2557 | * set other configurations. */ | |
2558 | } | |
2559 | } | |
2560 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2561 | |
93993a0a | 2562 | error_device_descriptor: |
da307123 | 2563 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2564 | error_autoresume: |
2565 | out_authorized: | |
781b2137 | 2566 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2567 | return result; |
2568 | } | |
2569 | ||
2570 | ||
0165de09 IPG |
2571 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2572 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2573 | { | |
2574 | struct usb_hcd *hcd; | |
2575 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2576 | return 0; | |
2577 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
2578 | return hcd->wireless; | |
2579 | } | |
2580 | ||
2581 | ||
1da177e4 LT |
2582 | #define PORT_RESET_TRIES 5 |
2583 | #define SET_ADDRESS_TRIES 2 | |
2584 | #define GET_DESCRIPTOR_TRIES 2 | |
2585 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2586 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 LT |
2587 | |
2588 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2589 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2590 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2591 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2592 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2593 | |
48fc7dbd DW |
2594 | /* |
2595 | * "New scheme" enumeration causes an extra state transition to be | |
2596 | * exposed to an xhci host and causes USB3 devices to receive control | |
2597 | * commands in the default state. This has been seen to cause | |
2598 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2599 | * devices. | |
2600 | */ | |
2601 | static bool use_new_scheme(struct usb_device *udev, int retry) | |
2602 | { | |
2603 | if (udev->speed == USB_SPEED_SUPER) | |
2604 | return false; | |
2605 | ||
2606 | return USE_NEW_SCHEME(retry); | |
2607 | } | |
2608 | ||
10d674a8 SS |
2609 | static int hub_port_reset(struct usb_hub *hub, int port1, |
2610 | struct usb_device *udev, unsigned int delay, bool warm); | |
2611 | ||
025d4430 | 2612 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2613 | * Port worm reset is required to recover |
2614 | */ | |
3cd12f91 DW |
2615 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
2616 | u16 portstatus) | |
10d674a8 | 2617 | { |
3cd12f91 DW |
2618 | u16 link_state; |
2619 | ||
2620 | if (!hub_is_superspeed(hub->hdev)) | |
2621 | return false; | |
2622 | ||
2623 | if (test_bit(port1, hub->warm_reset_bits)) | |
2624 | return true; | |
2625 | ||
2626 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; | |
2627 | return link_state == USB_SS_PORT_LS_SS_INACTIVE | |
2628 | || link_state == USB_SS_PORT_LS_COMP_MOD; | |
10d674a8 SS |
2629 | } |
2630 | ||
1da177e4 | 2631 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2632 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2633 | { |
2634 | int delay_time, ret; | |
2635 | u16 portstatus; | |
2636 | u16 portchange; | |
2637 | ||
2638 | for (delay_time = 0; | |
2639 | delay_time < HUB_RESET_TIMEOUT; | |
2640 | delay_time += delay) { | |
2641 | /* wait to give the device a chance to reset */ | |
2642 | msleep(delay); | |
2643 | ||
2644 | /* read and decode port status */ | |
2645 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2646 | if (ret < 0) | |
2647 | return ret; | |
2648 | ||
4f43447e | 2649 | /* The port state is unknown until the reset completes. */ |
470f0be8 SS |
2650 | if (!(portstatus & USB_PORT_STAT_RESET)) |
2651 | break; | |
1da177e4 LT |
2652 | |
2653 | /* switch to the long delay after two short delay failures */ | |
2654 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2655 | delay = HUB_LONG_RESET_TIME; | |
2656 | ||
d99f6b41 DW |
2657 | dev_dbg(&hub->ports[port1 - 1]->dev, |
2658 | "not %sreset yet, waiting %dms\n", | |
2659 | warm ? "warm " : "", delay); | |
1da177e4 LT |
2660 | } |
2661 | ||
470f0be8 SS |
2662 | if ((portstatus & USB_PORT_STAT_RESET)) |
2663 | return -EBUSY; | |
2664 | ||
3cd12f91 | 2665 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
470f0be8 SS |
2666 | return -ENOTCONN; |
2667 | ||
2668 | /* Device went away? */ | |
2669 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2670 | return -ENOTCONN; | |
2671 | ||
2672 | /* bomb out completely if the connection bounced. A USB 3.0 | |
2673 | * connection may bounce if multiple warm resets were issued, | |
2674 | * but the device may have successfully re-connected. Ignore it. | |
2675 | */ | |
2676 | if (!hub_is_superspeed(hub->hdev) && | |
2677 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
2678 | return -ENOTCONN; | |
2679 | ||
2680 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2681 | return -EBUSY; | |
2682 | ||
2683 | if (!udev) | |
2684 | return 0; | |
2685 | ||
2686 | if (hub_is_wusb(hub)) | |
2687 | udev->speed = USB_SPEED_WIRELESS; | |
2688 | else if (hub_is_superspeed(hub->hdev)) | |
2689 | udev->speed = USB_SPEED_SUPER; | |
2690 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2691 | udev->speed = USB_SPEED_HIGH; | |
2692 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2693 | udev->speed = USB_SPEED_LOW; | |
2694 | else | |
2695 | udev->speed = USB_SPEED_FULL; | |
2696 | return 0; | |
1da177e4 LT |
2697 | } |
2698 | ||
75d7cf72 | 2699 | static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
a24a6078 | 2700 | struct usb_device *udev, int *status) |
75d7cf72 AX |
2701 | { |
2702 | switch (*status) { | |
2703 | case 0: | |
a24a6078 SS |
2704 | /* TRSTRCY = 10 ms; plus some extra */ |
2705 | msleep(10 + 40); | |
2706 | if (udev) { | |
2707 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2708 | ||
2709 | update_devnum(udev, 0); | |
2710 | /* The xHC may think the device is already reset, | |
2711 | * so ignore the status. | |
2712 | */ | |
2713 | if (hcd->driver->reset_device) | |
2714 | hcd->driver->reset_device(hcd, udev); | |
75d7cf72 AX |
2715 | } |
2716 | /* FALL THROUGH */ | |
2717 | case -ENOTCONN: | |
2718 | case -ENODEV: | |
ad493e5e | 2719 | usb_clear_port_feature(hub->hdev, |
75d7cf72 | 2720 | port1, USB_PORT_FEAT_C_RESET); |
1c7439c6 | 2721 | if (hub_is_superspeed(hub->hdev)) { |
ad493e5e | 2722 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2723 | USB_PORT_FEAT_C_BH_PORT_RESET); |
ad493e5e | 2724 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2725 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
ad493e5e | 2726 | usb_clear_port_feature(hub->hdev, port1, |
a24a6078 | 2727 | USB_PORT_FEAT_C_CONNECTION); |
1c7439c6 | 2728 | } |
a24a6078 | 2729 | if (udev) |
75d7cf72 AX |
2730 | usb_set_device_state(udev, *status |
2731 | ? USB_STATE_NOTATTACHED | |
2732 | : USB_STATE_DEFAULT); | |
75d7cf72 AX |
2733 | break; |
2734 | } | |
2735 | } | |
2736 | ||
2737 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ | |
1da177e4 | 2738 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2739 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2740 | { |
2741 | int i, status; | |
a24a6078 | 2742 | u16 portchange, portstatus; |
d99f6b41 | 2743 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1da177e4 | 2744 | |
0fe51aa5 SS |
2745 | if (!hub_is_superspeed(hub->hdev)) { |
2746 | if (warm) { | |
75d7cf72 AX |
2747 | dev_err(hub->intfdev, "only USB3 hub support " |
2748 | "warm reset\n"); | |
2749 | return -EINVAL; | |
2750 | } | |
0fe51aa5 SS |
2751 | /* Block EHCI CF initialization during the port reset. |
2752 | * Some companion controllers don't like it when they mix. | |
2753 | */ | |
2754 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2755 | } else if (!warm) { |
2756 | /* | |
2757 | * If the caller hasn't explicitly requested a warm reset, | |
2758 | * double check and see if one is needed. | |
2759 | */ | |
2760 | status = hub_port_status(hub, port1, | |
2761 | &portstatus, &portchange); | |
2762 | if (status < 0) | |
2763 | goto done; | |
2764 | ||
3cd12f91 | 2765 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
d3b9d7a9 | 2766 | warm = true; |
75d7cf72 | 2767 | } |
3cd12f91 | 2768 | clear_bit(port1, hub->warm_reset_bits); |
32fe0198 | 2769 | |
1da177e4 LT |
2770 | /* Reset the port */ |
2771 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2772 | status = set_port_feature(hub->hdev, port1, (warm ? |
2773 | USB_PORT_FEAT_BH_PORT_RESET : | |
2774 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2775 | if (status == -ENODEV) { |
2776 | ; /* The hub is gone */ | |
2777 | } else if (status) { | |
d99f6b41 DW |
2778 | dev_err(&port_dev->dev, |
2779 | "cannot %sreset (err = %d)\n", | |
2780 | warm ? "warm " : "", status); | |
75d7cf72 AX |
2781 | } else { |
2782 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2783 | warm); | |
e9e88fb7 | 2784 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2785 | dev_dbg(hub->intfdev, |
2786 | "port_wait_reset: err = %d\n", | |
2787 | status); | |
2788 | } | |
2789 | ||
a24a6078 | 2790 | /* Check for disconnect or reset */ |
75d7cf72 | 2791 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
a24a6078 SS |
2792 | hub_port_finish_reset(hub, port1, udev, &status); |
2793 | ||
2794 | if (!hub_is_superspeed(hub->hdev)) | |
2795 | goto done; | |
2796 | ||
2797 | /* | |
2798 | * If a USB 3.0 device migrates from reset to an error | |
2799 | * state, re-issue the warm reset. | |
2800 | */ | |
2801 | if (hub_port_status(hub, port1, | |
2802 | &portstatus, &portchange) < 0) | |
2803 | goto done; | |
2804 | ||
3cd12f91 DW |
2805 | if (!hub_port_warm_reset_required(hub, port1, |
2806 | portstatus)) | |
a24a6078 SS |
2807 | goto done; |
2808 | ||
2809 | /* | |
2810 | * If the port is in SS.Inactive or Compliance Mode, the | |
2811 | * hot or warm reset failed. Try another warm reset. | |
2812 | */ | |
2813 | if (!warm) { | |
d99f6b41 DW |
2814 | dev_dbg(&port_dev->dev, |
2815 | "hot reset failed, warm reset\n"); | |
a24a6078 SS |
2816 | warm = true; |
2817 | } | |
1da177e4 LT |
2818 | } |
2819 | ||
d99f6b41 DW |
2820 | dev_dbg(&port_dev->dev, |
2821 | "not enabled, trying %sreset again...\n", | |
2822 | warm ? "warm " : ""); | |
1da177e4 LT |
2823 | delay = HUB_LONG_RESET_TIME; |
2824 | } | |
2825 | ||
d99f6b41 | 2826 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
1da177e4 | 2827 | |
75d7cf72 | 2828 | done: |
0fe51aa5 | 2829 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2830 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2831 | |
75d7cf72 | 2832 | return status; |
5e467f6e AX |
2833 | } |
2834 | ||
0ed9a57e AX |
2835 | /* Check if a port is power on */ |
2836 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2837 | { | |
2838 | int ret = 0; | |
2839 | ||
2840 | if (hub_is_superspeed(hub->hdev)) { | |
2841 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2842 | ret = 1; | |
2843 | } else { | |
2844 | if (portstatus & USB_PORT_STAT_POWER) | |
2845 | ret = 1; | |
2846 | } | |
2847 | ||
2848 | return ret; | |
2849 | } | |
2850 | ||
5c79a1e3 DW |
2851 | static void usb_lock_port(struct usb_port *port_dev) |
2852 | __acquires(&port_dev->status_lock) | |
2853 | { | |
2854 | mutex_lock(&port_dev->status_lock); | |
2855 | __acquire(&port_dev->status_lock); | |
2856 | } | |
2857 | ||
2858 | static void usb_unlock_port(struct usb_port *port_dev) | |
2859 | __releases(&port_dev->status_lock) | |
2860 | { | |
2861 | mutex_unlock(&port_dev->status_lock); | |
2862 | __release(&port_dev->status_lock); | |
2863 | } | |
2864 | ||
d388dab7 | 2865 | #ifdef CONFIG_PM |
1da177e4 | 2866 | |
0ed9a57e AX |
2867 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2868 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2869 | { | |
2870 | int ret = 0; | |
2871 | ||
2872 | if (hub_is_superspeed(hub->hdev)) { | |
2873 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2874 | == USB_SS_PORT_LS_U3) | |
2875 | ret = 1; | |
2876 | } else { | |
2877 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2878 | ret = 1; | |
2879 | } | |
2880 | ||
2881 | return ret; | |
2882 | } | |
b01b03f3 AS |
2883 | |
2884 | /* Determine whether the device on a port is ready for a normal resume, | |
2885 | * is ready for a reset-resume, or should be disconnected. | |
2886 | */ | |
2887 | static int check_port_resume_type(struct usb_device *udev, | |
2888 | struct usb_hub *hub, int port1, | |
2889 | int status, unsigned portchange, unsigned portstatus) | |
2890 | { | |
d99f6b41 DW |
2891 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
2892 | ||
3cd12f91 DW |
2893 | /* Is a warm reset needed to recover the connection? */ |
2894 | if (status == 0 && udev->reset_resume | |
2895 | && hub_port_warm_reset_required(hub, port1, portstatus)) { | |
2896 | /* pass */; | |
2897 | } | |
b01b03f3 | 2898 | /* Is the device still present? */ |
3cd12f91 | 2899 | else if (status || port_is_suspended(hub, portstatus) || |
0ed9a57e AX |
2900 | !port_is_power_on(hub, portstatus) || |
2901 | !(portstatus & USB_PORT_STAT_CONNECTION)) { | |
b01b03f3 AS |
2902 | if (status >= 0) |
2903 | status = -ENODEV; | |
2904 | } | |
2905 | ||
86c57edf AS |
2906 | /* Can't do a normal resume if the port isn't enabled, |
2907 | * so try a reset-resume instead. | |
2908 | */ | |
2909 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2910 | if (udev->persist_enabled) | |
2911 | udev->reset_resume = 1; | |
2912 | else | |
2913 | status = -ENODEV; | |
2914 | } | |
b01b03f3 AS |
2915 | |
2916 | if (status) { | |
d99f6b41 DW |
2917 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
2918 | portchange, portstatus, status); | |
b01b03f3 AS |
2919 | } else if (udev->reset_resume) { |
2920 | ||
2921 | /* Late port handoff can set status-change bits */ | |
2922 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 2923 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2924 | USB_PORT_FEAT_C_CONNECTION); |
2925 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 2926 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2927 | USB_PORT_FEAT_C_ENABLE); |
2928 | } | |
2929 | ||
2930 | return status; | |
2931 | } | |
2932 | ||
f74631e3 SS |
2933 | int usb_disable_ltm(struct usb_device *udev) |
2934 | { | |
2935 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2936 | ||
2937 | /* Check if the roothub and device supports LTM. */ | |
2938 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2939 | !usb_device_supports_ltm(udev)) | |
2940 | return 0; | |
2941 | ||
2942 | /* Clear Feature LTM Enable can only be sent if the device is | |
2943 | * configured. | |
2944 | */ | |
2945 | if (!udev->actconfig) | |
2946 | return 0; | |
2947 | ||
2948 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2949 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2950 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2951 | USB_CTRL_SET_TIMEOUT); | |
2952 | } | |
2953 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
2954 | ||
2955 | void usb_enable_ltm(struct usb_device *udev) | |
2956 | { | |
2957 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2958 | ||
2959 | /* Check if the roothub and device supports LTM. */ | |
2960 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2961 | !usb_device_supports_ltm(udev)) | |
2962 | return; | |
2963 | ||
2964 | /* Set Feature LTM Enable can only be sent if the device is | |
2965 | * configured. | |
2966 | */ | |
2967 | if (!udev->actconfig) | |
2968 | return; | |
2969 | ||
2970 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2971 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2972 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2973 | USB_CTRL_SET_TIMEOUT); | |
2974 | } | |
2975 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
2976 | ||
54a3ac0c | 2977 | /* |
28e86165 | 2978 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
2979 | * @udev: target device |
2980 | * | |
28e86165 AS |
2981 | * For USB-2 devices: Set the device's remote wakeup feature. |
2982 | * | |
2983 | * For USB-3 devices: Assume there's only one function on the device and | |
2984 | * enable remote wake for the first interface. FIXME if the interface | |
2985 | * association descriptor shows there's more than one function. | |
54a3ac0c | 2986 | */ |
28e86165 | 2987 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 2988 | { |
28e86165 AS |
2989 | if (udev->speed < USB_SPEED_SUPER) |
2990 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2991 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2992 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
2993 | USB_CTRL_SET_TIMEOUT); | |
2994 | else | |
2995 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2996 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
2997 | USB_INTRF_FUNC_SUSPEND, | |
2998 | USB_INTRF_FUNC_SUSPEND_RW | | |
2999 | USB_INTRF_FUNC_SUSPEND_LP, | |
3000 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3001 | } | |
3002 | ||
3003 | /* | |
3004 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
3005 | * @udev: target device | |
3006 | * | |
3007 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
3008 | * | |
3009 | * For USB-3 devices: Assume there's only one function on the device and | |
3010 | * disable remote wake for the first interface. FIXME if the interface | |
3011 | * association descriptor shows there's more than one function. | |
3012 | */ | |
3013 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
3014 | { | |
3015 | if (udev->speed < USB_SPEED_SUPER) | |
3016 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3017 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3018 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3019 | USB_CTRL_SET_TIMEOUT); | |
3020 | else | |
3021 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
54a3ac0c LT |
3022 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
3023 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, | |
3024 | USB_CTRL_SET_TIMEOUT); | |
3025 | } | |
1da177e4 | 3026 | |
e583d9db AS |
3027 | /* Count of wakeup-enabled devices at or below udev */ |
3028 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
3029 | { | |
3030 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
3031 | ||
3032 | return udev->do_remote_wakeup + | |
3033 | (hub ? hub->wakeup_enabled_descendants : 0); | |
3034 | } | |
3035 | ||
1da177e4 | 3036 | /* |
624d6c07 AS |
3037 | * usb_port_suspend - suspend a usb device's upstream port |
3038 | * @udev: device that's no longer in active use, not a root hub | |
3039 | * Context: must be able to sleep; device not locked; pm locks held | |
3040 | * | |
3041 | * Suspends a USB device that isn't in active use, conserving power. | |
3042 | * Devices may wake out of a suspend, if anything important happens, | |
3043 | * using the remote wakeup mechanism. They may also be taken out of | |
3044 | * suspend by the host, using usb_port_resume(). It's also routine | |
3045 | * to disconnect devices while they are suspended. | |
3046 | * | |
3047 | * This only affects the USB hardware for a device; its interfaces | |
3048 | * (and, for hubs, child devices) must already have been suspended. | |
3049 | * | |
1da177e4 LT |
3050 | * Selective port suspend reduces power; most suspended devices draw |
3051 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
3052 | * All devices below the suspended port are also suspended. | |
3053 | * | |
3054 | * Devices leave suspend state when the host wakes them up. Some devices | |
3055 | * also support "remote wakeup", where the device can activate the USB | |
3056 | * tree above them to deliver data, such as a keypress or packet. In | |
3057 | * some cases, this wakes the USB host. | |
624d6c07 AS |
3058 | * |
3059 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
3060 | * between a pair of dual-role devices. That will change roles, such | |
3061 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
3062 | * | |
3063 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
3064 | * to ACPI D2, "may cause the device to lose some context". | |
3065 | * State transitions include: | |
3066 | * | |
3067 | * - suspend, resume ... when the VBUS power link stays live | |
3068 | * - suspend, disconnect ... VBUS lost | |
3069 | * | |
3070 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
3071 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
3072 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
3073 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
3074 | * timer, no SRP, no requests through sysfs. | |
3075 | * | |
e583d9db AS |
3076 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
3077 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
3078 | * hub is suspended). Nevertheless, we change @udev->state to |
3079 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
3080 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
3081 | * |
3082 | * Returns 0 on success, else negative errno. | |
1da177e4 | 3083 | */ |
65bfd296 | 3084 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3085 | { |
ad493e5e LT |
3086 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3087 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3088 | int port1 = udev->portnum; |
3089 | int status; | |
0aa2832d | 3090 | bool really_suspend = true; |
1da177e4 | 3091 | |
5c79a1e3 DW |
3092 | usb_lock_port(port_dev); |
3093 | ||
1da177e4 LT |
3094 | /* enable remote wakeup when appropriate; this lets the device |
3095 | * wake up the upstream hub (including maybe the root hub). | |
3096 | * | |
3097 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
3098 | * we don't explicitly enable it here. | |
3099 | */ | |
645daaab | 3100 | if (udev->do_remote_wakeup) { |
28e86165 | 3101 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 3102 | if (status) { |
624d6c07 AS |
3103 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
3104 | status); | |
0c487206 | 3105 | /* bail if autosuspend is requested */ |
5b1b0b81 | 3106 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 3107 | goto err_wakeup; |
0c487206 | 3108 | } |
1da177e4 LT |
3109 | } |
3110 | ||
65580b43 AX |
3111 | /* disable USB2 hardware LPM */ |
3112 | if (udev->usb2_hw_lpm_enabled == 1) | |
3113 | usb_set_usb2_hardware_lpm(udev, 0); | |
3114 | ||
f74631e3 | 3115 | if (usb_disable_ltm(udev)) { |
4fae6f0f AS |
3116 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
3117 | status = -ENOMEM; | |
3118 | if (PMSG_IS_AUTO(msg)) | |
3119 | goto err_ltm; | |
f74631e3 | 3120 | } |
8306095f | 3121 | if (usb_unlocked_disable_lpm(udev)) { |
4fae6f0f AS |
3122 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
3123 | status = -ENOMEM; | |
3124 | if (PMSG_IS_AUTO(msg)) | |
3125 | goto err_lpm3; | |
8306095f SS |
3126 | } |
3127 | ||
1da177e4 | 3128 | /* see 7.1.7.6 */ |
a7114230 | 3129 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3130 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3131 | |
0aa2832d AS |
3132 | /* |
3133 | * For system suspend, we do not need to enable the suspend feature | |
3134 | * on individual USB-2 ports. The devices will automatically go | |
3135 | * into suspend a few ms after the root hub stops sending packets. | |
3136 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3137 | * |
3138 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3139 | * from a downstream port if the port's suspend feature isn't on. | |
3140 | * Therefore we will turn on the suspend feature if udev or any of its | |
3141 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3142 | */ |
e583d9db AS |
3143 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3144 | status = set_port_feature(hub->hdev, port1, | |
3145 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3146 | else { |
3147 | really_suspend = false; | |
3148 | status = 0; | |
3149 | } | |
1da177e4 | 3150 | if (status) { |
d99f6b41 | 3151 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
cbb33004 | 3152 | |
4fae6f0f AS |
3153 | /* Try to enable USB3 LPM and LTM again */ |
3154 | usb_unlocked_enable_lpm(udev); | |
3155 | err_lpm3: | |
3156 | usb_enable_ltm(udev); | |
3157 | err_ltm: | |
c3e751e4 AX |
3158 | /* Try to enable USB2 hardware LPM again */ |
3159 | if (udev->usb2_hw_lpm_capable == 1) | |
3160 | usb_set_usb2_hardware_lpm(udev, 1); | |
3161 | ||
4fae6f0f AS |
3162 | if (udev->do_remote_wakeup) |
3163 | (void) usb_disable_remote_wakeup(udev); | |
3164 | err_wakeup: | |
8306095f | 3165 | |
cbb33004 | 3166 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3167 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3168 | status = 0; |
1da177e4 | 3169 | } else { |
30b1a7a3 AS |
3170 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3171 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3172 | udev->do_remote_wakeup); | |
0aa2832d AS |
3173 | if (really_suspend) { |
3174 | udev->port_is_suspended = 1; | |
e583d9db AS |
3175 | |
3176 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3177 | msleep(10); |
3178 | } | |
e583d9db | 3179 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3180 | } |
ad493e5e | 3181 | |
d5c3834e DW |
3182 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
3183 | && test_and_clear_bit(port1, hub->child_usage_bits)) | |
98a4f1ff | 3184 | pm_runtime_put_sync(&port_dev->dev); |
ad493e5e | 3185 | |
c08512c7 | 3186 | usb_mark_last_busy(hub->hdev); |
5c79a1e3 DW |
3187 | |
3188 | usb_unlock_port(port_dev); | |
1da177e4 LT |
3189 | return status; |
3190 | } | |
3191 | ||
1da177e4 | 3192 | /* |
390a8c34 DB |
3193 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3194 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3195 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3196 | * hardware resume signaling is finished, either because of selective |
3197 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3198 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3199 | * |
3200 | * If @udev->reset_resume is set then the device is reset before the | |
3201 | * status check is done. | |
1da177e4 | 3202 | */ |
140d8f68 | 3203 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3204 | { |
54515fe5 | 3205 | int status = 0; |
07e72b95 | 3206 | u16 devstatus = 0; |
1da177e4 LT |
3207 | |
3208 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3209 | dev_dbg(&udev->dev, "%s\n", |
3210 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3211 | |
3212 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3213 | * state the device resumes to. Linux currently won't see the | |
3214 | * first two on the host side; they'd be inside hub_port_init() | |
3215 | * during many timeouts, but khubd can't suspend until later. | |
3216 | */ | |
3217 | usb_set_device_state(udev, udev->actconfig | |
3218 | ? USB_STATE_CONFIGURED | |
3219 | : USB_STATE_ADDRESS); | |
1da177e4 | 3220 | |
54515fe5 AS |
3221 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3222 | * device is enabled for remote wakeup. Hence the reset | |
3223 | * operation is carried out here, after the port has been | |
3224 | * resumed. | |
3225 | */ | |
1d10255c AS |
3226 | if (udev->reset_resume) { |
3227 | /* | |
3228 | * If the device morphs or switches modes when it is reset, | |
3229 | * we don't want to perform a reset-resume. We'll fail the | |
3230 | * resume, which will cause a logical disconnect, and then | |
3231 | * the device will be rediscovered. | |
3232 | */ | |
86c57edf | 3233 | retry_reset_resume: |
1d10255c AS |
3234 | if (udev->quirks & USB_QUIRK_RESET) |
3235 | status = -ENODEV; | |
3236 | else | |
3237 | status = usb_reset_and_verify_device(udev); | |
3238 | } | |
54515fe5 | 3239 | |
469271f8 MB |
3240 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3241 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3242 | * and device drivers will know about any resume quirks. |
3243 | */ | |
54515fe5 | 3244 | if (status == 0) { |
46dede46 | 3245 | devstatus = 0; |
54515fe5 | 3246 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3247 | |
3248 | /* If a normal resume failed, try doing a reset-resume */ | |
3249 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3250 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3251 | udev->reset_resume = 1; | |
3252 | goto retry_reset_resume; | |
3253 | } | |
54515fe5 | 3254 | } |
b40b7a90 | 3255 | |
624d6c07 AS |
3256 | if (status) { |
3257 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3258 | status); | |
07e72b95 ON |
3259 | /* |
3260 | * There are a few quirky devices which violate the standard | |
3261 | * by claiming to have remote wakeup enabled after a reset, | |
3262 | * which crash if the feature is cleared, hence check for | |
3263 | * udev->reset_resume | |
3264 | */ | |
3265 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3266 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3267 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3268 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c LT |
3269 | } else { |
3270 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, | |
3271 | &devstatus); | |
54a3ac0c LT |
3272 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3273 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3274 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3275 | } |
54a3ac0c LT |
3276 | |
3277 | if (status) | |
3278 | dev_dbg(&udev->dev, | |
3279 | "disable remote wakeup, status %d\n", | |
3280 | status); | |
1da177e4 | 3281 | status = 0; |
1da177e4 LT |
3282 | } |
3283 | return status; | |
3284 | } | |
3285 | ||
a40178b2 PA |
3286 | /* |
3287 | * There are some SS USB devices which take longer time for link training. | |
3288 | * XHCI specs 4.19.4 says that when Link training is successful, port | |
3289 | * sets CSC bit to 1. So if SW reads port status before successful link | |
3290 | * training, then it will not find device to be present. | |
3291 | * USB Analyzer log with such buggy devices show that in some cases | |
3292 | * device switch on the RX termination after long delay of host enabling | |
3293 | * the VBUS. In few other cases it has been seen that device fails to | |
3294 | * negotiate link training in first attempt. It has been | |
3295 | * reported till now that few devices take as long as 2000 ms to train | |
3296 | * the link after host enabling its VBUS and termination. Following | |
3297 | * routine implements a 2000 ms timeout for link training. If in a case | |
3298 | * link trains before timeout, loop will exit earlier. | |
3299 | * | |
3300 | * FIXME: If a device was connected before suspend, but was removed | |
3301 | * while system was asleep, then the loop in the following routine will | |
3302 | * only exit at timeout. | |
3303 | * | |
3304 | * This routine should only be called when persist is enabled for a SS | |
3305 | * device. | |
3306 | */ | |
3307 | static int wait_for_ss_port_enable(struct usb_device *udev, | |
3308 | struct usb_hub *hub, int *port1, | |
3309 | u16 *portchange, u16 *portstatus) | |
3310 | { | |
3311 | int status = 0, delay_ms = 0; | |
3312 | ||
3313 | while (delay_ms < 2000) { | |
3314 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) | |
3315 | break; | |
3316 | msleep(20); | |
3317 | delay_ms += 20; | |
3318 | status = hub_port_status(hub, *port1, portstatus, portchange); | |
3319 | } | |
3320 | return status; | |
3321 | } | |
3322 | ||
624d6c07 AS |
3323 | /* |
3324 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3325 | * @udev: device to re-activate, not a root hub | |
3326 | * Context: must be able to sleep; device not locked; pm locks held | |
3327 | * | |
3328 | * This will re-activate the suspended device, increasing power usage | |
3329 | * while letting drivers communicate again with its endpoints. | |
3330 | * USB resume explicitly guarantees that the power session between | |
3331 | * the host and the device is the same as it was when the device | |
3332 | * suspended. | |
3333 | * | |
feccc30d AS |
3334 | * If @udev->reset_resume is set then this routine won't check that the |
3335 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3336 | * reset @udev. The end result is that a broken power session can be |
3337 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3338 | * | |
3339 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3340 | * during a system sleep or is reset when the system wakes up, all the USB | |
3341 | * power sessions below it will be broken. This is especially troublesome | |
3342 | * for mass-storage devices containing mounted filesystems, since the | |
3343 | * device will appear to have disconnected and all the memory mappings | |
3344 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3345 | * made to appear as if it had not disconnected. | |
3346 | * | |
742120c6 | 3347 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3348 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3349 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3350 | * quite possible for a device to remain unaltered but its media to be | |
3351 | * changed. If the user replaces a flash memory card while the system is | |
3352 | * asleep, he will have only himself to blame when the filesystem on the | |
3353 | * new card is corrupted and the system crashes. | |
3354 | * | |
624d6c07 AS |
3355 | * Returns 0 on success, else negative errno. |
3356 | */ | |
65bfd296 | 3357 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3358 | { |
ad493e5e LT |
3359 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3360 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3361 | int port1 = udev->portnum; |
3362 | int status; | |
3363 | u16 portchange, portstatus; | |
d25450c6 | 3364 | |
d5c3834e | 3365 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
ad493e5e | 3366 | status = pm_runtime_get_sync(&port_dev->dev); |
ad493e5e LT |
3367 | if (status < 0) { |
3368 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3369 | status); | |
3370 | return status; | |
3371 | } | |
3372 | } | |
3373 | ||
5c79a1e3 DW |
3374 | usb_lock_port(port_dev); |
3375 | ||
d25450c6 AS |
3376 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3377 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3378 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3379 | goto SuspendCleared; |
1da177e4 | 3380 | |
1da177e4 | 3381 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3382 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3383 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3384 | else |
ad493e5e | 3385 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3386 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3387 | if (status) { |
d99f6b41 | 3388 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
1da177e4 | 3389 | } else { |
1da177e4 | 3390 | /* drive resume for at least 20 msec */ |
686314cf | 3391 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3392 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
1da177e4 LT |
3393 | msleep(25); |
3394 | ||
1da177e4 LT |
3395 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3396 | * stop resume signaling. Then finish the resume | |
3397 | * sequence. | |
3398 | */ | |
d25450c6 | 3399 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3400 | |
b01b03f3 AS |
3401 | /* TRSMRCY = 10 msec */ |
3402 | msleep(10); | |
3403 | } | |
3404 | ||
54515fe5 | 3405 | SuspendCleared: |
b01b03f3 | 3406 | if (status == 0) { |
bfd1e910 | 3407 | udev->port_is_suspended = 0; |
a7114230 AX |
3408 | if (hub_is_superspeed(hub->hdev)) { |
3409 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3410 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3411 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3412 | } else { | |
3413 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3414 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3415 | USB_PORT_FEAT_C_SUSPEND); |
3416 | } | |
1da177e4 | 3417 | } |
1da177e4 | 3418 | |
a40178b2 PA |
3419 | if (udev->persist_enabled && hub_is_superspeed(hub->hdev)) |
3420 | status = wait_for_ss_port_enable(udev, hub, &port1, &portchange, | |
3421 | &portstatus); | |
3422 | ||
b01b03f3 AS |
3423 | status = check_port_resume_type(udev, |
3424 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3425 | if (status == 0) |
3426 | status = finish_port_resume(udev); | |
3427 | if (status < 0) { | |
3428 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3429 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3430 | } else { |
3431 | /* Try to enable USB2 hardware LPM */ | |
3432 | if (udev->usb2_hw_lpm_capable == 1) | |
3433 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3434 | |
f74631e3 SS |
3435 | /* Try to enable USB3 LTM and LPM */ |
3436 | usb_enable_ltm(udev); | |
8306095f | 3437 | usb_unlocked_enable_lpm(udev); |
54515fe5 | 3438 | } |
65580b43 | 3439 | |
5c79a1e3 DW |
3440 | usb_unlock_port(port_dev); |
3441 | ||
1da177e4 LT |
3442 | return status; |
3443 | } | |
3444 | ||
84ebc102 AS |
3445 | #ifdef CONFIG_PM_RUNTIME |
3446 | ||
0534d468 | 3447 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3448 | { |
3449 | int status = 0; | |
3450 | ||
5c79a1e3 | 3451 | usb_lock_device(udev); |
1da177e4 | 3452 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3453 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3454 | status = usb_autoresume_device(udev); |
3455 | if (status == 0) { | |
3456 | /* Let the drivers do their thing, then... */ | |
3457 | usb_autosuspend_device(udev); | |
3458 | } | |
1da177e4 | 3459 | } |
5c79a1e3 | 3460 | usb_unlock_device(udev); |
1da177e4 LT |
3461 | return status; |
3462 | } | |
3463 | ||
7e73be22 DW |
3464 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
3465 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3466 | u16 portstatus, u16 portchange) | |
3467 | __must_hold(&port_dev->status_lock) | |
3468 | { | |
3469 | struct usb_port *port_dev = hub->ports[port - 1]; | |
3470 | struct usb_device *hdev; | |
3471 | struct usb_device *udev; | |
3472 | int connect_change = 0; | |
3473 | int ret; | |
3474 | ||
3475 | hdev = hub->hdev; | |
3476 | udev = port_dev->child; | |
3477 | if (!hub_is_superspeed(hdev)) { | |
3478 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
3479 | return 0; | |
3480 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); | |
3481 | } else { | |
3482 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
3483 | (portstatus & USB_PORT_STAT_LINK_STATE) != | |
3484 | USB_SS_PORT_LS_U0) | |
3485 | return 0; | |
3486 | } | |
3487 | ||
3488 | if (udev) { | |
3489 | /* TRSMRCY = 10 msec */ | |
3490 | msleep(10); | |
3491 | ||
3492 | usb_unlock_port(port_dev); | |
3493 | ret = usb_remote_wakeup(udev); | |
3494 | usb_lock_port(port_dev); | |
3495 | if (ret < 0) | |
3496 | connect_change = 1; | |
3497 | } else { | |
3498 | ret = -ENODEV; | |
3499 | hub_port_disable(hub, port, 1); | |
3500 | } | |
3501 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); | |
3502 | return connect_change; | |
3503 | } | |
3504 | ||
3505 | #else | |
3506 | ||
3507 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3508 | u16 portstatus, u16 portchange) | |
3509 | { | |
3510 | return 0; | |
3511 | } | |
3512 | ||
d388dab7 AS |
3513 | #endif |
3514 | ||
e6f30dea ML |
3515 | static int check_ports_changed(struct usb_hub *hub) |
3516 | { | |
3517 | int port1; | |
3518 | ||
3519 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3520 | u16 portstatus, portchange; | |
3521 | int status; | |
3522 | ||
3523 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3524 | if (!status && portchange) | |
3525 | return 1; | |
3526 | } | |
3527 | return 0; | |
3528 | } | |
3529 | ||
db690874 | 3530 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
3531 | { |
3532 | struct usb_hub *hub = usb_get_intfdata (intf); | |
3533 | struct usb_device *hdev = hub->hdev; | |
3534 | unsigned port1; | |
4296c70a | 3535 | int status; |
1da177e4 | 3536 | |
e583d9db AS |
3537 | /* |
3538 | * Warn if children aren't already suspended. | |
3539 | * Also, add up the number of wakeup-enabled descendants. | |
3540 | */ | |
3541 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 | 3542 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
d99f6b41 DW |
3543 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
3544 | struct usb_device *udev = port_dev->child; | |
1da177e4 | 3545 | |
6840d255 | 3546 | if (udev && udev->can_submit) { |
b658b8f5 DW |
3547 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
3548 | dev_name(&udev->dev)); | |
5b1b0b81 | 3549 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3550 | return -EBUSY; |
c9f89fa4 | 3551 | } |
e583d9db AS |
3552 | if (udev) |
3553 | hub->wakeup_enabled_descendants += | |
3554 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3555 | } |
e6f30dea ML |
3556 | |
3557 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3558 | /* check if there are changes pending on hub ports */ | |
3559 | if (check_ports_changed(hub)) { | |
3560 | if (PMSG_IS_AUTO(msg)) | |
3561 | return -EBUSY; | |
3562 | pm_wakeup_event(&hdev->dev, 2000); | |
3563 | } | |
3564 | } | |
3565 | ||
4296c70a SS |
3566 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3567 | /* Enable hub to send remote wakeup for all ports. */ | |
3568 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3569 | status = set_port_feature(hdev, | |
3570 | port1 | | |
3571 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3572 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3573 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3574 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3575 | } | |
3576 | } | |
1da177e4 | 3577 | |
441b62c1 | 3578 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3579 | |
12f1ff83 | 3580 | /* stop khubd and related activity */ |
4330354f | 3581 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3582 | return 0; |
1da177e4 LT |
3583 | } |
3584 | ||
3585 | static int hub_resume(struct usb_interface *intf) | |
3586 | { | |
5e6effae | 3587 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3588 | |
5e6effae | 3589 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3590 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3591 | return 0; |
3592 | } | |
3593 | ||
b41a60ec | 3594 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3595 | { |
b41a60ec | 3596 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3597 | |
5e6effae | 3598 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3599 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3600 | return 0; |
3601 | } | |
3602 | ||
54515fe5 AS |
3603 | /** |
3604 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3605 | * @rhdev: struct usb_device for the root hub | |
3606 | * | |
3607 | * The USB host controller driver calls this function when its root hub | |
3608 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3609 | * has been reset. The routine marks @rhdev as having lost power. |
3610 | * When the hub driver is resumed it will take notice and carry out | |
3611 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3612 | * the others will be disconnected. | |
54515fe5 AS |
3613 | */ |
3614 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3615 | { | |
3616 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3617 | rhdev->reset_resume = 1; | |
3618 | } | |
3619 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3620 | ||
1ea7e0e8 SS |
3621 | static const char * const usb3_lpm_names[] = { |
3622 | "U0", | |
3623 | "U1", | |
3624 | "U2", | |
3625 | "U3", | |
3626 | }; | |
3627 | ||
3628 | /* | |
3629 | * Send a Set SEL control transfer to the device, prior to enabling | |
3630 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3631 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3632 | * packet from the host. | |
3633 | * | |
3634 | * This function will fail if the SEL or PEL values for udev are greater than | |
3635 | * the maximum allowed values for the link state to be enabled. | |
3636 | */ | |
3637 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3638 | { | |
3639 | struct usb_set_sel_req *sel_values; | |
3640 | unsigned long long u1_sel; | |
3641 | unsigned long long u1_pel; | |
3642 | unsigned long long u2_sel; | |
3643 | unsigned long long u2_pel; | |
3644 | int ret; | |
3645 | ||
38d7f688 XR |
3646 | if (udev->state != USB_STATE_CONFIGURED) |
3647 | return 0; | |
3648 | ||
1ea7e0e8 SS |
3649 | /* Convert SEL and PEL stored in ns to us */ |
3650 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3651 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3652 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3653 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3654 | ||
3655 | /* | |
3656 | * Make sure that the calculated SEL and PEL values for the link | |
3657 | * state we're enabling aren't bigger than the max SEL/PEL | |
3658 | * value that will fit in the SET SEL control transfer. | |
3659 | * Otherwise the device would get an incorrect idea of the exit | |
3660 | * latency for the link state, and could start a device-initiated | |
3661 | * U1/U2 when the exit latencies are too high. | |
3662 | */ | |
3663 | if ((state == USB3_LPM_U1 && | |
3664 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3665 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3666 | (state == USB3_LPM_U2 && | |
3667 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3668 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3669 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3670 | usb3_lpm_names[state], u1_sel, u1_pel); |
3671 | return -EINVAL; | |
3672 | } | |
3673 | ||
3674 | /* | |
3675 | * If we're enabling device-initiated LPM for one link state, | |
3676 | * but the other link state has a too high SEL or PEL value, | |
3677 | * just set those values to the max in the Set SEL request. | |
3678 | */ | |
3679 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3680 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3681 | ||
3682 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3683 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3684 | ||
3685 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3686 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3687 | ||
3688 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3689 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3690 | ||
3691 | /* | |
3692 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3693 | * which may be initiated by an error path of a mass storage driver. | |
3694 | * Therefore, use GFP_NOIO. | |
3695 | */ | |
3696 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3697 | if (!sel_values) | |
3698 | return -ENOMEM; | |
3699 | ||
3700 | sel_values->u1_sel = u1_sel; | |
3701 | sel_values->u1_pel = u1_pel; | |
3702 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3703 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3704 | ||
3705 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3706 | USB_REQ_SET_SEL, | |
3707 | USB_RECIP_DEVICE, | |
3708 | 0, 0, | |
3709 | sel_values, sizeof *(sel_values), | |
3710 | USB_CTRL_SET_TIMEOUT); | |
3711 | kfree(sel_values); | |
3712 | return ret; | |
3713 | } | |
3714 | ||
3715 | /* | |
3716 | * Enable or disable device-initiated U1 or U2 transitions. | |
3717 | */ | |
3718 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3719 | enum usb3_link_state state, bool enable) | |
3720 | { | |
3721 | int ret; | |
3722 | int feature; | |
3723 | ||
3724 | switch (state) { | |
3725 | case USB3_LPM_U1: | |
3726 | feature = USB_DEVICE_U1_ENABLE; | |
3727 | break; | |
3728 | case USB3_LPM_U2: | |
3729 | feature = USB_DEVICE_U2_ENABLE; | |
3730 | break; | |
3731 | default: | |
3732 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3733 | __func__, enable ? "enable" : "disable"); | |
3734 | return -EINVAL; | |
3735 | } | |
3736 | ||
3737 | if (udev->state != USB_STATE_CONFIGURED) { | |
3738 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3739 | "for unconfigured device.\n", | |
3740 | __func__, enable ? "enable" : "disable", | |
3741 | usb3_lpm_names[state]); | |
3742 | return 0; | |
3743 | } | |
3744 | ||
3745 | if (enable) { | |
1ea7e0e8 SS |
3746 | /* |
3747 | * Now send the control transfer to enable device-initiated LPM | |
3748 | * for either U1 or U2. | |
3749 | */ | |
3750 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3751 | USB_REQ_SET_FEATURE, | |
3752 | USB_RECIP_DEVICE, | |
3753 | feature, | |
3754 | 0, NULL, 0, | |
3755 | USB_CTRL_SET_TIMEOUT); | |
3756 | } else { | |
3757 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3758 | USB_REQ_CLEAR_FEATURE, | |
3759 | USB_RECIP_DEVICE, | |
3760 | feature, | |
3761 | 0, NULL, 0, | |
3762 | USB_CTRL_SET_TIMEOUT); | |
3763 | } | |
3764 | if (ret < 0) { | |
3765 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3766 | enable ? "Enable" : "Disable", | |
3767 | usb3_lpm_names[state]); | |
3768 | return -EBUSY; | |
3769 | } | |
3770 | return 0; | |
3771 | } | |
3772 | ||
3773 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3774 | enum usb3_link_state state, int timeout) | |
3775 | { | |
3776 | int ret; | |
3777 | int feature; | |
3778 | ||
3779 | switch (state) { | |
3780 | case USB3_LPM_U1: | |
3781 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3782 | break; | |
3783 | case USB3_LPM_U2: | |
3784 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3785 | break; | |
3786 | default: | |
3787 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3788 | __func__); | |
3789 | return -EINVAL; | |
3790 | } | |
3791 | ||
3792 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3793 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3794 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3795 | "which is a reserved value.\n", | |
3796 | usb3_lpm_names[state], timeout); | |
3797 | return -EINVAL; | |
3798 | } | |
3799 | ||
3800 | ret = set_port_feature(udev->parent, | |
3801 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3802 | feature); | |
3803 | if (ret < 0) { | |
3804 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3805 | "error code %i\n", usb3_lpm_names[state], | |
3806 | timeout, ret); | |
3807 | return -EBUSY; | |
3808 | } | |
3809 | if (state == USB3_LPM_U1) | |
3810 | udev->u1_params.timeout = timeout; | |
3811 | else | |
3812 | udev->u2_params.timeout = timeout; | |
3813 | return 0; | |
3814 | } | |
3815 | ||
3816 | /* | |
3817 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3818 | * U1/U2 entry. | |
3819 | * | |
3820 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3821 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3822 | * will be successful. | |
3823 | * | |
3824 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3825 | * driver know about it. If that call fails, it should be harmless, and just | |
3826 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3827 | */ | |
3828 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3829 | enum usb3_link_state state) | |
3830 | { | |
65a95b75 | 3831 | int timeout, ret; |
ae8963ad SS |
3832 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3833 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3834 | ||
3835 | /* If the device says it doesn't have *any* exit latency to come out of | |
3836 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3837 | * state. | |
3838 | */ | |
3839 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3840 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3841 | return; | |
1ea7e0e8 | 3842 | |
65a95b75 SS |
3843 | /* |
3844 | * First, let the device know about the exit latencies | |
3845 | * associated with the link state we're about to enable. | |
3846 | */ | |
3847 | ret = usb_req_set_sel(udev, state); | |
3848 | if (ret < 0) { | |
3849 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3850 | usb3_lpm_names[state]); | |
3851 | return; | |
3852 | } | |
3853 | ||
1ea7e0e8 SS |
3854 | /* We allow the host controller to set the U1/U2 timeout internally |
3855 | * first, so that it can change its schedule to account for the | |
3856 | * additional latency to send data to a device in a lower power | |
3857 | * link state. | |
3858 | */ | |
3859 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3860 | ||
3861 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3862 | if (timeout == 0) | |
3863 | return; | |
3864 | ||
3865 | if (timeout < 0) { | |
3866 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3867 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3868 | timeout); | |
3869 | return; | |
3870 | } | |
3871 | ||
3872 | if (usb_set_lpm_timeout(udev, state, timeout)) | |
3873 | /* If we can't set the parent hub U1/U2 timeout, | |
3874 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3875 | * host know that this link state won't be enabled. | |
3876 | */ | |
3877 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
3878 | ||
3879 | /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ | |
3880 | else if (udev->actconfig) | |
3881 | usb_set_device_initiated_lpm(udev, state, true); | |
3882 | ||
3883 | } | |
3884 | ||
3885 | /* | |
3886 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3887 | * U1/U2 entry. | |
3888 | * | |
3889 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3890 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3891 | * | |
3892 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3893 | * it won't have an effect on the bus link state because the parent hub will | |
3894 | * still disallow device-initiated U1/U2 entry. | |
3895 | * | |
3896 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3897 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3898 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3899 | */ | |
3900 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3901 | enum usb3_link_state state) | |
3902 | { | |
3903 | int feature; | |
3904 | ||
3905 | switch (state) { | |
3906 | case USB3_LPM_U1: | |
3907 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3908 | break; | |
3909 | case USB3_LPM_U2: | |
3910 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3911 | break; | |
3912 | default: | |
3913 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
3914 | __func__); | |
3915 | return -EINVAL; | |
3916 | } | |
3917 | ||
3918 | if (usb_set_lpm_timeout(udev, state, 0)) | |
3919 | return -EBUSY; | |
3920 | ||
3921 | usb_set_device_initiated_lpm(udev, state, false); | |
3922 | ||
3923 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
3924 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
3925 | "bus schedule bandwidth may be impacted.\n", | |
3926 | usb3_lpm_names[state]); | |
3927 | return 0; | |
3928 | } | |
3929 | ||
3930 | /* | |
3931 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
3932 | * Caller must own the bandwidth_mutex. | |
3933 | * | |
3934 | * This will call usb_enable_lpm() on failure, which will decrement | |
3935 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
3936 | */ | |
3937 | int usb_disable_lpm(struct usb_device *udev) | |
3938 | { | |
3939 | struct usb_hcd *hcd; | |
3940 | ||
3941 | if (!udev || !udev->parent || | |
3942 | udev->speed != USB_SPEED_SUPER || | |
51df62ff PA |
3943 | !udev->lpm_capable || |
3944 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
3945 | return 0; |
3946 | ||
3947 | hcd = bus_to_hcd(udev->bus); | |
3948 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
3949 | return 0; | |
3950 | ||
3951 | udev->lpm_disable_count++; | |
55558c33 | 3952 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
3953 | return 0; |
3954 | ||
3955 | /* If LPM is enabled, attempt to disable it. */ | |
3956 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
3957 | goto enable_lpm; | |
3958 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
3959 | goto enable_lpm; | |
3960 | ||
3961 | return 0; | |
3962 | ||
3963 | enable_lpm: | |
3964 | usb_enable_lpm(udev); | |
3965 | return -EBUSY; | |
3966 | } | |
3967 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
3968 | ||
3969 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
3970 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3971 | { | |
3972 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3973 | int ret; | |
3974 | ||
3975 | if (!hcd) | |
3976 | return -EINVAL; | |
3977 | ||
3978 | mutex_lock(hcd->bandwidth_mutex); | |
3979 | ret = usb_disable_lpm(udev); | |
3980 | mutex_unlock(hcd->bandwidth_mutex); | |
3981 | ||
3982 | return ret; | |
3983 | } | |
3984 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
3985 | ||
3986 | /* | |
3987 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
3988 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
3989 | * | |
3990 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
3991 | * until the lpm_disable_count drops to zero. Caller must own the | |
3992 | * bandwidth_mutex. | |
3993 | */ | |
3994 | void usb_enable_lpm(struct usb_device *udev) | |
3995 | { | |
3996 | struct usb_hcd *hcd; | |
3997 | ||
3998 | if (!udev || !udev->parent || | |
3999 | udev->speed != USB_SPEED_SUPER || | |
51df62ff PA |
4000 | !udev->lpm_capable || |
4001 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4002 | return; |
4003 | ||
4004 | udev->lpm_disable_count--; | |
4005 | hcd = bus_to_hcd(udev->bus); | |
4006 | /* Double check that we can both enable and disable LPM. | |
4007 | * Device must be configured to accept set feature U1/U2 timeout. | |
4008 | */ | |
4009 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
4010 | !hcd->driver->disable_usb3_lpm_timeout) | |
4011 | return; | |
4012 | ||
4013 | if (udev->lpm_disable_count > 0) | |
4014 | return; | |
4015 | ||
4016 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
4017 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
4018 | } | |
4019 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
4020 | ||
4021 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
4022 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
4023 | { | |
4024 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4025 | ||
4026 | if (!hcd) | |
4027 | return; | |
4028 | ||
4029 | mutex_lock(hcd->bandwidth_mutex); | |
4030 | usb_enable_lpm(udev); | |
4031 | mutex_unlock(hcd->bandwidth_mutex); | |
4032 | } | |
4033 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
4034 | ||
4035 | ||
d388dab7 AS |
4036 | #else /* CONFIG_PM */ |
4037 | ||
f07600cf AS |
4038 | #define hub_suspend NULL |
4039 | #define hub_resume NULL | |
4040 | #define hub_reset_resume NULL | |
1ea7e0e8 SS |
4041 | |
4042 | int usb_disable_lpm(struct usb_device *udev) | |
4043 | { | |
4044 | return 0; | |
4045 | } | |
e9261fb6 | 4046 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
4047 | |
4048 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4049 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
4050 | |
4051 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4052 | { | |
4053 | return 0; | |
4054 | } | |
e9261fb6 | 4055 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
4056 | |
4057 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4058 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
4059 | |
4060 | int usb_disable_ltm(struct usb_device *udev) | |
4061 | { | |
4062 | return 0; | |
4063 | } | |
4064 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
4065 | ||
4066 | void usb_enable_ltm(struct usb_device *udev) { } | |
4067 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 | 4068 | |
4a95b1fc SR |
4069 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
4070 | u16 portstatus, u16 portchange) | |
4071 | { | |
4072 | return 0; | |
4073 | } | |
4074 | ||
c4b51a43 | 4075 | #endif /* CONFIG_PM */ |
d388dab7 | 4076 | |
1da177e4 LT |
4077 | |
4078 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
4079 | * | |
4080 | * Between connect detection and reset signaling there must be a delay | |
4081 | * of 100ms at least for debounce and power-settling. The corresponding | |
4082 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 4083 | * |
1da177e4 LT |
4084 | * Apparently there are some bluetooth and irda-dongles and a number of |
4085 | * low-speed devices for which this debounce period may last over a second. | |
4086 | * Not covered by the spec - but easy to deal with. | |
4087 | * | |
4088 | * This implementation uses a 1500ms total debounce timeout; if the | |
4089 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
4090 | * every 25ms for transient disconnects. When the port status has been | |
4091 | * unchanged for 100ms it returns the port status. | |
4092 | */ | |
ad493e5e | 4093 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
4094 | { |
4095 | int ret; | |
1da177e4 LT |
4096 | u16 portchange, portstatus; |
4097 | unsigned connection = 0xffff; | |
d99f6b41 DW |
4098 | int total_time, stable_time = 0; |
4099 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
1da177e4 LT |
4100 | |
4101 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
4102 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
4103 | if (ret < 0) | |
4104 | return ret; | |
4105 | ||
4106 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
4107 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
4108 | if (!must_be_connected || |
4109 | (connection == USB_PORT_STAT_CONNECTION)) | |
4110 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
4111 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
4112 | break; | |
4113 | } else { | |
4114 | stable_time = 0; | |
4115 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
4116 | } | |
4117 | ||
4118 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 4119 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
4120 | USB_PORT_FEAT_C_CONNECTION); |
4121 | } | |
4122 | ||
4123 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
4124 | break; | |
4125 | msleep(HUB_DEBOUNCE_STEP); | |
4126 | } | |
4127 | ||
d99f6b41 DW |
4128 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
4129 | total_time, stable_time, portstatus); | |
1da177e4 LT |
4130 | |
4131 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
4132 | return -ETIMEDOUT; | |
4133 | return portstatus; | |
4134 | } | |
4135 | ||
fc721f51 | 4136 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 4137 | { |
ddeac4e7 AS |
4138 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
4139 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 4140 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 4141 | } |
fc721f51 | 4142 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
4143 | |
4144 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
4145 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
4146 | ||
4326ed0b | 4147 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
4148 | { |
4149 | int retval; | |
c6515272 | 4150 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 4151 | |
c6515272 SS |
4152 | /* |
4153 | * The host controller will choose the device address, | |
4154 | * instead of the core having chosen it earlier | |
4155 | */ | |
4156 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
4157 | return -EINVAL; |
4158 | if (udev->state == USB_STATE_ADDRESS) | |
4159 | return 0; | |
4160 | if (udev->state != USB_STATE_DEFAULT) | |
4161 | return -EINVAL; | |
c8d4af8e | 4162 | if (hcd->driver->address_device) |
c6515272 | 4163 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 4164 | else |
c6515272 SS |
4165 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
4166 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
4167 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 4168 | if (retval == 0) { |
3b29b68b | 4169 | update_devnum(udev, devnum); |
4953d141 | 4170 | /* Device now using proper address. */ |
1da177e4 | 4171 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 4172 | usb_ep0_reinit(udev); |
1da177e4 LT |
4173 | } |
4174 | return retval; | |
4175 | } | |
4176 | ||
890dae88 MN |
4177 | /* |
4178 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
4179 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
4180 | * enabled. | |
4181 | * | |
4182 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
4183 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
4184 | * support bit in the BOS descriptor. | |
4185 | */ | |
4186 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
4187 | { | |
d99f6b41 DW |
4188 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
4189 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; | |
890dae88 MN |
4190 | |
4191 | if (!udev->usb2_hw_lpm_capable) | |
4192 | return; | |
4193 | ||
d99f6b41 DW |
4194 | if (hub) |
4195 | connect_type = hub->ports[udev->portnum - 1]->connect_type; | |
890dae88 | 4196 | |
23c05820 | 4197 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
4198 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
4199 | udev->usb2_hw_lpm_allowed = 1; | |
4200 | usb_set_usb2_hardware_lpm(udev, 1); | |
4201 | } | |
4202 | } | |
4203 | ||
48fc7dbd DW |
4204 | static int hub_enable_device(struct usb_device *udev) |
4205 | { | |
4206 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4207 | ||
4208 | if (!hcd->driver->enable_device) | |
4209 | return 0; | |
4210 | if (udev->state == USB_STATE_ADDRESS) | |
4211 | return 0; | |
4212 | if (udev->state != USB_STATE_DEFAULT) | |
4213 | return -EINVAL; | |
4214 | ||
4215 | return hcd->driver->enable_device(hcd, udev); | |
4216 | } | |
4217 | ||
1da177e4 LT |
4218 | /* Reset device, (re)assign address, get device descriptor. |
4219 | * Device connection must be stable, no more debouncing needed. | |
4220 | * Returns device in USB_STATE_ADDRESS, except on error. | |
4221 | * | |
4222 | * If this is called for an already-existing device (as part of | |
5c79a1e3 DW |
4223 | * usb_reset_and_verify_device), the caller must own the device lock and |
4224 | * the port lock. For a newly detected device that is not accessible | |
4225 | * through any global pointers, it's not necessary to lock the device, | |
4226 | * but it is still necessary to lock the port. | |
1da177e4 LT |
4227 | */ |
4228 | static int | |
4229 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
4230 | int retry_counter) | |
4231 | { | |
1da177e4 | 4232 | struct usb_device *hdev = hub->hdev; |
e7b77172 | 4233 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
4234 | int i, j, retval; |
4235 | unsigned delay = HUB_SHORT_RESET_TIME; | |
4236 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4237 | const char *speed; |
4326ed0b | 4238 | int devnum = udev->devnum; |
1da177e4 LT |
4239 | |
4240 | /* root hub ports have a slightly longer reset period | |
4241 | * (from USB 2.0 spec, section 7.1.7.5) | |
4242 | */ | |
4243 | if (!hdev->parent) { | |
4244 | delay = HUB_ROOT_RESET_TIME; | |
4245 | if (port1 == hdev->bus->otg_port) | |
4246 | hdev->bus->b_hnp_enable = 0; | |
4247 | } | |
4248 | ||
4249 | /* Some low speed devices have problems with the quick delay, so */ | |
4250 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4251 | if (oldspeed == USB_SPEED_LOW) | |
4252 | delay = HUB_LONG_RESET_TIME; | |
4253 | ||
6fecd4f2 | 4254 | mutex_lock(&hdev->bus->usb_address0_mutex); |
1da177e4 | 4255 | |
07194ab7 LT |
4256 | /* Reset the device; full speed may morph to high speed */ |
4257 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4258 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4259 | if (retval < 0) /* error or disconnect */ |
4260 | goto fail; | |
4261 | /* success, speed is known */ | |
4262 | ||
1da177e4 LT |
4263 | retval = -ENODEV; |
4264 | ||
4265 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
4266 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
4267 | goto fail; | |
4268 | } | |
4269 | oldspeed = udev->speed; | |
4326ed0b | 4270 | |
1da177e4 LT |
4271 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4272 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4273 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4274 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4275 | */ |
4276 | switch (udev->speed) { | |
6b403b02 | 4277 | case USB_SPEED_SUPER: |
551cdbbe | 4278 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4279 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4280 | break; |
1da177e4 | 4281 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4282 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4283 | break; |
4284 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4285 | /* to determine the ep0 maxpacket size, try to read | |
4286 | * the device descriptor to get bMaxPacketSize0 and | |
4287 | * then correct our initial guess. | |
4288 | */ | |
551509d2 | 4289 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4290 | break; |
4291 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4292 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4293 | break; |
4294 | default: | |
4295 | goto fail; | |
4296 | } | |
e538dfda MN |
4297 | |
4298 | if (udev->speed == USB_SPEED_WIRELESS) | |
4299 | speed = "variable speed Wireless"; | |
4300 | else | |
4301 | speed = usb_speed_string(udev->speed); | |
4302 | ||
c6515272 SS |
4303 | if (udev->speed != USB_SPEED_SUPER) |
4304 | dev_info(&udev->dev, | |
e538dfda MN |
4305 | "%s %s USB device number %d using %s\n", |
4306 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 4307 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
4308 | |
4309 | /* Set up TT records, if needed */ | |
4310 | if (hdev->tt) { | |
4311 | udev->tt = hdev->tt; | |
4312 | udev->ttport = hdev->ttport; | |
4313 | } else if (udev->speed != USB_SPEED_HIGH | |
4314 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4315 | if (!hub->tt.hub) { |
4316 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4317 | retval = -EINVAL; | |
4318 | goto fail; | |
4319 | } | |
1da177e4 LT |
4320 | udev->tt = &hub->tt; |
4321 | udev->ttport = port1; | |
4322 | } | |
469271f8 | 4323 | |
1da177e4 LT |
4324 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4325 | * Because device hardware and firmware is sometimes buggy in | |
4326 | * this area, and this is how Linux has done it for ages. | |
4327 | * Change it cautiously. | |
4328 | * | |
48fc7dbd | 4329 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4330 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4331 | * so it may help with some non-standards-compliant devices. | |
4332 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4333 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4334 | * value. | |
4335 | */ | |
4336 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
48fc7dbd DW |
4337 | bool did_new_scheme = false; |
4338 | ||
4339 | if (use_new_scheme(udev, retry_counter)) { | |
1da177e4 LT |
4340 | struct usb_device_descriptor *buf; |
4341 | int r = 0; | |
4342 | ||
48fc7dbd DW |
4343 | did_new_scheme = true; |
4344 | retval = hub_enable_device(udev); | |
938569eb ON |
4345 | if (retval < 0) { |
4346 | dev_err(&udev->dev, | |
4347 | "hub failed to enable device, error %d\n", | |
4348 | retval); | |
48fc7dbd | 4349 | goto fail; |
938569eb | 4350 | } |
48fc7dbd | 4351 | |
1da177e4 LT |
4352 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4353 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4354 | if (!buf) { | |
4355 | retval = -ENOMEM; | |
4356 | continue; | |
4357 | } | |
4358 | ||
b89ee19a AS |
4359 | /* Retry on all errors; some devices are flakey. |
4360 | * 255 is for WUSB devices, we actually need to use | |
4361 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
4362 | */ |
4363 | for (j = 0; j < 3; ++j) { | |
4364 | buf->bMaxPacketSize0 = 0; | |
4365 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4366 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4367 | USB_DT_DEVICE << 8, 0, | |
4368 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4369 | initial_descriptor_timeout); |
1da177e4 | 4370 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4371 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4372 | if (buf->bDescriptorType == |
4373 | USB_DT_DEVICE) { | |
4374 | r = 0; | |
4375 | break; | |
4376 | } | |
4377 | /* FALL THROUGH */ | |
4378 | default: | |
4379 | if (r == 0) | |
4380 | r = -EPROTO; | |
4381 | break; | |
4382 | } | |
4383 | if (r == 0) | |
4384 | break; | |
4385 | } | |
4386 | udev->descriptor.bMaxPacketSize0 = | |
4387 | buf->bMaxPacketSize0; | |
4388 | kfree(buf); | |
4389 | ||
75d7cf72 | 4390 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4391 | if (retval < 0) /* error or disconnect */ |
4392 | goto fail; | |
4393 | if (oldspeed != udev->speed) { | |
4394 | dev_dbg(&udev->dev, | |
4395 | "device reset changed speed!\n"); | |
4396 | retval = -ENODEV; | |
4397 | goto fail; | |
4398 | } | |
4399 | if (r) { | |
e9e88fb7 AS |
4400 | if (r != -ENODEV) |
4401 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4402 | r); | |
1da177e4 LT |
4403 | retval = -EMSGSIZE; |
4404 | continue; | |
4405 | } | |
4406 | #undef GET_DESCRIPTOR_BUFSIZE | |
4407 | } | |
4408 | ||
469271f8 MB |
4409 | /* |
4410 | * If device is WUSB, we already assigned an | |
4411 | * unauthorized address in the Connect Ack sequence; | |
4412 | * authorization will assign the final address. | |
4413 | */ | |
c6515272 | 4414 | if (udev->wusb == 0) { |
6c529cdc IPG |
4415 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
4416 | retval = hub_set_address(udev, devnum); | |
4417 | if (retval >= 0) | |
4418 | break; | |
4419 | msleep(200); | |
4420 | } | |
4421 | if (retval < 0) { | |
e9e88fb7 AS |
4422 | if (retval != -ENODEV) |
4423 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4424 | devnum, retval); | |
6c529cdc IPG |
4425 | goto fail; |
4426 | } | |
c6515272 SS |
4427 | if (udev->speed == USB_SPEED_SUPER) { |
4428 | devnum = udev->devnum; | |
4429 | dev_info(&udev->dev, | |
3b29b68b | 4430 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 4431 | (udev->config) ? "reset" : "new", |
3b29b68b | 4432 | devnum, udev->bus->controller->driver->name); |
c6515272 | 4433 | } |
6c529cdc IPG |
4434 | |
4435 | /* cope with hardware quirkiness: | |
4436 | * - let SET_ADDRESS settle, some device hardware wants it | |
4437 | * - read ep0 maxpacket even for high and low speed, | |
4438 | */ | |
4439 | msleep(10); | |
48fc7dbd DW |
4440 | /* use_new_scheme() checks the speed which may have |
4441 | * changed since the initial look so we cache the result | |
4442 | * in did_new_scheme | |
4443 | */ | |
4444 | if (did_new_scheme) | |
1da177e4 | 4445 | break; |
469271f8 | 4446 | } |
1da177e4 LT |
4447 | |
4448 | retval = usb_get_device_descriptor(udev, 8); | |
4449 | if (retval < 8) { | |
e9e88fb7 AS |
4450 | if (retval != -ENODEV) |
4451 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4452 | "device descriptor read/8, error %d\n", |
4453 | retval); | |
1da177e4 LT |
4454 | if (retval >= 0) |
4455 | retval = -EMSGSIZE; | |
4456 | } else { | |
4457 | retval = 0; | |
4458 | break; | |
4459 | } | |
4460 | } | |
4461 | if (retval) | |
4462 | goto fail; | |
4463 | ||
b76baa81 | 4464 | if (hcd->phy && !hdev->parent) |
ac96511b | 4465 | usb_phy_notify_connect(hcd->phy, udev->speed); |
b76baa81 | 4466 | |
d8aec3db EF |
4467 | /* |
4468 | * Some superspeed devices have finished the link training process | |
4469 | * and attached to a superspeed hub port, but the device descriptor | |
4470 | * got from those devices show they aren't superspeed devices. Warm | |
4471 | * reset the port attached by the devices can fix them. | |
4472 | */ | |
4473 | if ((udev->speed == USB_SPEED_SUPER) && | |
4474 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { | |
4475 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4476 | "warm reset device\n"); | |
4477 | hub_port_reset(hub, port1, udev, | |
4478 | HUB_BH_RESET_TIME, true); | |
4479 | retval = -EINVAL; | |
4480 | goto fail; | |
4481 | } | |
4482 | ||
6b403b02 SS |
4483 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
4484 | udev->speed == USB_SPEED_SUPER) | |
4485 | i = 512; | |
4486 | else | |
4487 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4488 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4489 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4490 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4491 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4492 | retval = -EMSGSIZE; |
4493 | goto fail; | |
4494 | } | |
56626a72 AS |
4495 | if (udev->speed == USB_SPEED_FULL) |
4496 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4497 | else | |
4498 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4499 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4500 | usb_ep0_reinit(udev); |
1da177e4 | 4501 | } |
469271f8 | 4502 | |
1da177e4 LT |
4503 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4504 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4505 | if (retval != -ENODEV) |
4506 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4507 | retval); | |
1da177e4 LT |
4508 | if (retval >= 0) |
4509 | retval = -ENOMSG; | |
4510 | goto fail; | |
4511 | } | |
4512 | ||
1ff4df56 AX |
4513 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4514 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4515 | if (!retval) { |
d9b2099c | 4516 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4517 | usb_set_lpm_parameters(udev); |
4518 | } | |
1ff4df56 | 4519 | } |
3148bf04 | 4520 | |
1da177e4 | 4521 | retval = 0; |
48f24970 AD |
4522 | /* notify HCD that we have a device connected and addressed */ |
4523 | if (hcd->driver->update_device) | |
4524 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4525 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4526 | fail: |
4326ed0b | 4527 | if (retval) { |
1da177e4 | 4528 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4529 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4530 | } |
6fecd4f2 | 4531 | mutex_unlock(&hdev->bus->usb_address0_mutex); |
1da177e4 LT |
4532 | return retval; |
4533 | } | |
4534 | ||
4535 | static void | |
4536 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
4537 | { | |
4538 | struct usb_qualifier_descriptor *qual; | |
4539 | int status; | |
4540 | ||
2a159389 JH |
4541 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
4542 | return; | |
4543 | ||
e94b1766 | 4544 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4545 | if (qual == NULL) |
4546 | return; | |
4547 | ||
4548 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
4549 | qual, sizeof *qual); | |
4550 | if (status == sizeof *qual) { | |
4551 | dev_info(&udev->dev, "not running at top speed; " | |
4552 | "connect to a high speed hub\n"); | |
4553 | /* hub LEDs are probably harder to miss than syslog */ | |
4554 | if (hub->has_indicators) { | |
4555 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4556 | queue_delayed_work(system_power_efficient_wq, |
4557 | &hub->leds, 0); | |
1da177e4 LT |
4558 | } |
4559 | } | |
1bc3c9e1 | 4560 | kfree(qual); |
1da177e4 LT |
4561 | } |
4562 | ||
4563 | static unsigned | |
4564 | hub_power_remaining (struct usb_hub *hub) | |
4565 | { | |
4566 | struct usb_device *hdev = hub->hdev; | |
4567 | int remaining; | |
55c52718 | 4568 | int port1; |
1da177e4 | 4569 | |
55c52718 | 4570 | if (!hub->limited_power) |
1da177e4 LT |
4571 | return 0; |
4572 | ||
55c52718 AS |
4573 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4574 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
4575 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4576 | struct usb_device *udev = port_dev->child; | |
4577 | unsigned unit_load; | |
4578 | int delta; | |
1da177e4 LT |
4579 | |
4580 | if (!udev) | |
4581 | continue; | |
430ee58e SAS |
4582 | if (hub_is_superspeed(udev)) |
4583 | unit_load = 150; | |
4584 | else | |
4585 | unit_load = 100; | |
1da177e4 | 4586 | |
430ee58e SAS |
4587 | /* |
4588 | * Unconfigured devices may not use more than one unit load, | |
4589 | * or 8mA for OTG ports | |
4590 | */ | |
1da177e4 | 4591 | if (udev->actconfig) |
8d8479db | 4592 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4593 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4594 | delta = unit_load; |
1da177e4 | 4595 | else |
55c52718 AS |
4596 | delta = 8; |
4597 | if (delta > hub->mA_per_port) | |
d99f6b41 DW |
4598 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
4599 | delta, hub->mA_per_port); | |
1da177e4 LT |
4600 | remaining -= delta; |
4601 | } | |
4602 | if (remaining < 0) { | |
55c52718 | 4603 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4604 | -remaining); |
1da177e4 LT |
4605 | remaining = 0; |
4606 | } | |
4607 | return remaining; | |
4608 | } | |
4609 | ||
af376a46 DW |
4610 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
4611 | u16 portchange) | |
1da177e4 | 4612 | { |
1da177e4 | 4613 | int status, i; |
430ee58e | 4614 | unsigned unit_load; |
1da177e4 | 4615 | struct usb_device *hdev = hub->hdev; |
90da096e | 4616 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
d99f6b41 | 4617 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
af376a46 | 4618 | struct usb_device *udev = port_dev->child; |
5ee0f803 | 4619 | static int unreliable_port = -1; |
8808f00c | 4620 | |
24618b0c | 4621 | /* Disconnect any existing devices under this port */ |
b76baa81 PC |
4622 | if (udev) { |
4623 | if (hcd->phy && !hdev->parent && | |
4624 | !(portstatus & USB_PORT_STAT_CONNECTION)) | |
ac96511b | 4625 | usb_phy_notify_disconnect(hcd->phy, udev->speed); |
d99f6b41 | 4626 | usb_disconnect(&port_dev->child); |
b76baa81 | 4627 | } |
24618b0c | 4628 | |
253e0572 AS |
4629 | /* We can forget about a "removed" device when there's a physical |
4630 | * disconnect or the connect status changes. | |
4631 | */ | |
4632 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4633 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4634 | clear_bit(port1, hub->removed_bits); | |
4635 | ||
5257d97a AS |
4636 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4637 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4638 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4639 | if (status < 0) { |
5ee0f803 ON |
4640 | if (status != -ENODEV && |
4641 | port1 != unreliable_port && | |
4642 | printk_ratelimit()) | |
dd5f5006 | 4643 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
5257d97a | 4644 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
5ee0f803 | 4645 | unreliable_port = port1; |
5257d97a AS |
4646 | } else { |
4647 | portstatus = status; | |
4648 | } | |
4649 | } | |
4650 | ||
253e0572 AS |
4651 | /* Return now if debouncing failed or nothing is connected or |
4652 | * the device was "removed". | |
4653 | */ | |
4654 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4655 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
4656 | |
4657 | /* maybe switch power back on (e.g. root hub was reset) */ | |
9262c19d | 4658 | if (hub_is_port_power_switchable(hub) |
0ed9a57e | 4659 | && !port_is_power_on(hub, portstatus)) |
1da177e4 | 4660 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4661 | |
1da177e4 | 4662 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4663 | goto done; |
1da177e4 LT |
4664 | return; |
4665 | } | |
430ee58e SAS |
4666 | if (hub_is_superspeed(hub->hdev)) |
4667 | unit_load = 150; | |
4668 | else | |
4669 | unit_load = 100; | |
1da177e4 | 4670 | |
e9e88fb7 | 4671 | status = 0; |
1da177e4 | 4672 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4673 | |
4674 | /* reallocate for each attempt, since references | |
4675 | * to the previous one can escape in various ways | |
4676 | */ | |
4677 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4678 | if (!udev) { | |
d99f6b41 DW |
4679 | dev_err(&port_dev->dev, |
4680 | "couldn't allocate usb_device\n"); | |
1da177e4 LT |
4681 | goto done; |
4682 | } | |
4683 | ||
4684 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4685 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4686 | udev->level = hdev->level + 1; |
8af548dc | 4687 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4688 | |
131dec34 SS |
4689 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
4690 | if (hub_is_superspeed(hub->hdev)) | |
e7b77172 SS |
4691 | udev->speed = USB_SPEED_SUPER; |
4692 | else | |
4693 | udev->speed = USB_SPEED_UNKNOWN; | |
4694 | ||
3b29b68b | 4695 | choose_devnum(udev); |
c8d4af8e AX |
4696 | if (udev->devnum <= 0) { |
4697 | status = -ENOTCONN; /* Don't retry */ | |
4698 | goto loop; | |
c6515272 SS |
4699 | } |
4700 | ||
e7b77172 | 4701 | /* reset (non-USB 3.0 devices) and get descriptor */ |
5c79a1e3 | 4702 | usb_lock_port(port_dev); |
1da177e4 | 4703 | status = hub_port_init(hub, udev, port1, i); |
5c79a1e3 | 4704 | usb_unlock_port(port_dev); |
1da177e4 LT |
4705 | if (status < 0) |
4706 | goto loop; | |
4707 | ||
93362a87 PD |
4708 | usb_detect_quirks(udev); |
4709 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
4710 | msleep(1000); | |
4711 | ||
1da177e4 LT |
4712 | /* consecutive bus-powered hubs aren't reliable; they can |
4713 | * violate the voltage drop budget. if the new child has | |
4714 | * a "powered" LED, users should notice we didn't enable it | |
4715 | * (without reading syslog), even without per-port LEDs | |
4716 | * on the parent. | |
4717 | */ | |
4718 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4719 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4720 | u16 devstat; |
4721 | ||
4722 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
4723 | &devstat); | |
15b7336e | 4724 | if (status) { |
1da177e4 LT |
4725 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4726 | goto loop_disable; | |
4727 | } | |
1da177e4 LT |
4728 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4729 | dev_err(&udev->dev, | |
4730 | "can't connect bus-powered hub " | |
4731 | "to this port\n"); | |
4732 | if (hub->has_indicators) { | |
4733 | hub->indicator[port1-1] = | |
4734 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
4735 | queue_delayed_work( |
4736 | system_power_efficient_wq, | |
4737 | &hub->leds, 0); | |
1da177e4 LT |
4738 | } |
4739 | status = -ENOTCONN; /* Don't retry */ | |
4740 | goto loop_disable; | |
4741 | } | |
4742 | } | |
469271f8 | 4743 | |
1da177e4 LT |
4744 | /* check for devices running slower than they could */ |
4745 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4746 | && udev->speed == USB_SPEED_FULL | |
4747 | && highspeed_hubs != 0) | |
4748 | check_highspeed (hub, udev, port1); | |
4749 | ||
fa286188 | 4750 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4751 | * udev becomes globally accessible, although presumably |
4752 | * no one will look at it until hdev is unlocked. | |
4753 | */ | |
1da177e4 LT |
4754 | status = 0; |
4755 | ||
d8521afe DW |
4756 | mutex_lock(&usb_port_peer_mutex); |
4757 | ||
1da177e4 LT |
4758 | /* We mustn't add new devices if the parent hub has |
4759 | * been disconnected; we would race with the | |
4760 | * recursively_mark_NOTATTACHED() routine. | |
4761 | */ | |
4762 | spin_lock_irq(&device_state_lock); | |
4763 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4764 | status = -ENOTCONN; | |
4765 | else | |
d99f6b41 | 4766 | port_dev->child = udev; |
1da177e4 | 4767 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4768 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4769 | |
4770 | /* Run it through the hoops (find a driver, etc) */ | |
4771 | if (!status) { | |
4772 | status = usb_new_device(udev); | |
4773 | if (status) { | |
d8521afe | 4774 | mutex_lock(&usb_port_peer_mutex); |
1da177e4 | 4775 | spin_lock_irq(&device_state_lock); |
d99f6b41 | 4776 | port_dev->child = NULL; |
1da177e4 | 4777 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4778 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4779 | } |
4780 | } | |
4781 | ||
1da177e4 LT |
4782 | if (status) |
4783 | goto loop_disable; | |
4784 | ||
4785 | status = hub_power_remaining(hub); | |
4786 | if (status) | |
d99f6b41 | 4787 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
1da177e4 LT |
4788 | |
4789 | return; | |
4790 | ||
4791 | loop_disable: | |
4792 | hub_port_disable(hub, port1, 1); | |
4793 | loop: | |
fc721f51 | 4794 | usb_ep0_reinit(udev); |
3b29b68b | 4795 | release_devnum(udev); |
f7410ced | 4796 | hub_free_dev(udev); |
1da177e4 | 4797 | usb_put_dev(udev); |
ffcdc18d | 4798 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
4799 | break; |
4800 | } | |
3a31155c AS |
4801 | if (hub->hdev->parent || |
4802 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4803 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4804 | if (status != -ENOTCONN && status != -ENODEV) | |
d99f6b41 DW |
4805 | dev_err(&port_dev->dev, |
4806 | "unable to enumerate USB device\n"); | |
e9e88fb7 | 4807 | } |
469271f8 | 4808 | |
1da177e4 LT |
4809 | done: |
4810 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
4811 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
4812 | hcd->driver->relinquish_port(hcd, port1); | |
af376a46 | 4813 | |
1da177e4 LT |
4814 | } |
4815 | ||
af376a46 DW |
4816 | /* Handle physical or logical connection change events. |
4817 | * This routine is called when: | |
4818 | * a port connection-change occurs; | |
4819 | * a port enable-change occurs (often caused by EMI); | |
4820 | * usb_reset_and_verify_device() encounters changed descriptors (as from | |
4821 | * a firmware download) | |
4822 | * caller already locked the hub | |
4823 | */ | |
4824 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4825 | u16 portstatus, u16 portchange) | |
5c79a1e3 | 4826 | __must_hold(&port_dev->status_lock) |
714b07be | 4827 | { |
af376a46 DW |
4828 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4829 | struct usb_device *udev = port_dev->child; | |
4830 | int status = -ENODEV; | |
714b07be | 4831 | |
af376a46 DW |
4832 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
4833 | portchange, portspeed(hub, portstatus)); | |
4834 | ||
4835 | if (hub->has_indicators) { | |
4836 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4837 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4ee823b8 SS |
4838 | } |
4839 | ||
af376a46 DW |
4840 | #ifdef CONFIG_USB_OTG |
4841 | /* during HNP, don't repeat the debounce */ | |
4842 | if (hub->hdev->bus->is_b_host) | |
4843 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | | |
4844 | USB_PORT_STAT_C_ENABLE); | |
4845 | #endif | |
4846 | ||
4847 | /* Try to resuscitate an existing device */ | |
4848 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
4849 | udev->state != USB_STATE_NOTATTACHED) { | |
4850 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
4851 | status = 0; /* Nothing to do */ | |
4852 | #ifdef CONFIG_PM_RUNTIME | |
4853 | } else if (udev->state == USB_STATE_SUSPENDED && | |
4854 | udev->persist_enabled) { | |
4855 | /* For a suspended device, treat this as a | |
4856 | * remote wakeup event. | |
4857 | */ | |
5c79a1e3 | 4858 | usb_unlock_port(port_dev); |
af376a46 | 4859 | status = usb_remote_wakeup(udev); |
5c79a1e3 | 4860 | usb_lock_port(port_dev); |
af376a46 DW |
4861 | #endif |
4862 | } else { | |
4863 | /* Don't resuscitate */; | |
4864 | } | |
af376a46 DW |
4865 | } |
4866 | clear_bit(port1, hub->change_bits); | |
4867 | ||
5c79a1e3 | 4868 | /* successfully revalidated the connection */ |
af376a46 DW |
4869 | if (status == 0) |
4870 | return; | |
4871 | ||
5c79a1e3 | 4872 | usb_unlock_port(port_dev); |
af376a46 | 4873 | hub_port_connect(hub, port1, portstatus, portchange); |
5c79a1e3 | 4874 | usb_lock_port(port_dev); |
1da177e4 LT |
4875 | } |
4876 | ||
af376a46 | 4877 | static void port_event(struct usb_hub *hub, int port1) |
5c79a1e3 | 4878 | __must_hold(&port_dev->status_lock) |
af376a46 DW |
4879 | { |
4880 | int connect_change, reset_device = 0; | |
4881 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
4882 | struct usb_device *udev = port_dev->child; | |
4883 | struct usb_device *hdev = hub->hdev; | |
4884 | u16 portstatus, portchange; | |
4885 | ||
4886 | connect_change = test_bit(port1, hub->change_bits); | |
4887 | clear_bit(port1, hub->event_bits); | |
4888 | clear_bit(port1, hub->wakeup_bits); | |
4889 | ||
4890 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) | |
4891 | return; | |
4892 | ||
4893 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
4894 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); | |
4895 | connect_change = 1; | |
4896 | } | |
4897 | ||
4898 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
4899 | if (!connect_change) | |
4900 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", | |
4901 | portstatus); | |
4902 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
4903 | ||
4904 | /* | |
4905 | * EM interference sometimes causes badly shielded USB devices | |
4906 | * to be shutdown by the hub, this hack enables them again. | |
4907 | * Works at least with mouse driver. | |
4908 | */ | |
4909 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
4910 | && !connect_change && udev) { | |
4911 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); | |
4912 | connect_change = 1; | |
4913 | } | |
4914 | } | |
4915 | ||
4916 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
4917 | u16 status = 0, unused; | |
4918 | ||
4919 | dev_dbg(&port_dev->dev, "over-current change\n"); | |
4920 | usb_clear_port_feature(hdev, port1, | |
4921 | USB_PORT_FEAT_C_OVER_CURRENT); | |
4922 | msleep(100); /* Cool down */ | |
4923 | hub_power_on(hub, true); | |
4924 | hub_port_status(hub, port1, &status, &unused); | |
4925 | if (status & USB_PORT_STAT_OVERCURRENT) | |
4926 | dev_err(&port_dev->dev, "over-current condition\n"); | |
4927 | } | |
4928 | ||
4929 | if (portchange & USB_PORT_STAT_C_RESET) { | |
4930 | dev_dbg(&port_dev->dev, "reset change\n"); | |
4931 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); | |
4932 | } | |
4933 | if ((portchange & USB_PORT_STAT_C_BH_RESET) | |
4934 | && hub_is_superspeed(hdev)) { | |
4935 | dev_dbg(&port_dev->dev, "warm reset change\n"); | |
4936 | usb_clear_port_feature(hdev, port1, | |
4937 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
4938 | } | |
4939 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { | |
4940 | dev_dbg(&port_dev->dev, "link state change\n"); | |
4941 | usb_clear_port_feature(hdev, port1, | |
4942 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
4943 | } | |
4944 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
4945 | dev_warn(&port_dev->dev, "config error\n"); | |
4946 | usb_clear_port_feature(hdev, port1, | |
4947 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
4948 | } | |
4949 | ||
097a155f DW |
4950 | /* skip port actions that require the port to be powered on */ |
4951 | if (!pm_runtime_active(&port_dev->dev)) | |
4952 | return; | |
714b07be | 4953 | |
af376a46 DW |
4954 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
4955 | connect_change = 1; | |
4956 | ||
4957 | /* | |
4958 | * Warm reset a USB3 protocol port if it's in | |
4959 | * SS.Inactive state. | |
4960 | */ | |
3cd12f91 | 4961 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
af376a46 DW |
4962 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
4963 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) | |
4964 | || udev->state == USB_STATE_NOTATTACHED) { | |
4965 | if (hub_port_reset(hub, port1, NULL, | |
4966 | HUB_BH_RESET_TIME, true) < 0) | |
4967 | hub_port_disable(hub, port1, 1); | |
4968 | } else | |
4969 | reset_device = 1; | |
4970 | } | |
4971 | ||
4972 | /* | |
4973 | * On disconnect USB3 protocol ports transit from U0 to | |
4974 | * SS.Inactive to Rx.Detect. If this happens a warm- | |
4975 | * reset is not needed, but a (re)connect may happen | |
4976 | * before khubd runs and sees the disconnect, and the | |
4977 | * device may be an unknown state. | |
4978 | * | |
4979 | * If the port went through SS.Inactive without khubd | |
4980 | * seeing it the C_LINK_STATE change flag will be set, | |
4981 | * and we reset the dev to put it in a known state. | |
4982 | */ | |
4983 | if (reset_device || (udev && hub_is_superspeed(hub->hdev) | |
4984 | && (portchange & USB_PORT_STAT_C_LINK_STATE) | |
4985 | && (portstatus & USB_PORT_STAT_CONNECTION))) { | |
5c79a1e3 | 4986 | usb_unlock_port(port_dev); |
714b07be | 4987 | usb_lock_device(udev); |
af376a46 | 4988 | usb_reset_device(udev); |
714b07be | 4989 | usb_unlock_device(udev); |
5c79a1e3 | 4990 | usb_lock_port(port_dev); |
af376a46 | 4991 | connect_change = 0; |
714b07be | 4992 | } |
af376a46 DW |
4993 | |
4994 | if (connect_change) | |
4995 | hub_port_connect_change(hub, port1, portstatus, portchange); | |
714b07be SS |
4996 | } |
4997 | ||
af376a46 | 4998 | |
1da177e4 LT |
4999 | static void hub_events(void) |
5000 | { | |
5001 | struct list_head *tmp; | |
5002 | struct usb_device *hdev; | |
5003 | struct usb_interface *intf; | |
5004 | struct usb_hub *hub; | |
5005 | struct device *hub_dev; | |
5006 | u16 hubstatus; | |
5007 | u16 hubchange; | |
1da177e4 | 5008 | int i, ret; |
1da177e4 LT |
5009 | |
5010 | /* | |
5011 | * We restart the list every time to avoid a deadlock with | |
5012 | * deleting hubs downstream from this one. This should be | |
5013 | * safe since we delete the hub from the event list. | |
5014 | * Not the most efficient, but avoids deadlocks. | |
5015 | */ | |
5016 | while (1) { | |
5017 | ||
5018 | /* Grab the first entry at the beginning of the list */ | |
5019 | spin_lock_irq(&hub_event_lock); | |
5020 | if (list_empty(&hub_event_list)) { | |
5021 | spin_unlock_irq(&hub_event_lock); | |
5022 | break; | |
5023 | } | |
5024 | ||
5025 | tmp = hub_event_list.next; | |
5026 | list_del_init(tmp); | |
5027 | ||
5028 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 | 5029 | kref_get(&hub->kref); |
c605f3cd JL |
5030 | hdev = hub->hdev; |
5031 | usb_get_dev(hdev); | |
e8054854 | 5032 | spin_unlock_irq(&hub_event_lock); |
1da177e4 | 5033 | |
e8054854 AS |
5034 | hub_dev = hub->intfdev; |
5035 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 5036 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
3bbc47d8 | 5037 | hdev->state, hdev->maxchild, |
1da177e4 LT |
5038 | /* NOTE: expects max 15 ports... */ |
5039 | (u16) hub->change_bits[0], | |
40f122f3 | 5040 | (u16) hub->event_bits[0]); |
1da177e4 | 5041 | |
1da177e4 LT |
5042 | /* Lock the device, then check to see if we were |
5043 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 5044 | usb_lock_device(hdev); |
e8054854 | 5045 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 5046 | goto loop_disconnected; |
1da177e4 LT |
5047 | |
5048 | /* If the hub has died, clean up after it */ | |
5049 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 5050 | hub->error = -ENODEV; |
4330354f | 5051 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
5052 | goto loop; |
5053 | } | |
5054 | ||
40f122f3 AS |
5055 | /* Autoresume */ |
5056 | ret = usb_autopm_get_interface(intf); | |
5057 | if (ret) { | |
5058 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
5059 | goto loop; | |
5060 | } | |
a8e7c565 | 5061 | |
40f122f3 | 5062 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 5063 | if (hub->quiescing) |
40f122f3 | 5064 | goto loop_autopm; |
1da177e4 LT |
5065 | |
5066 | if (hub->error) { | |
5067 | dev_dbg (hub_dev, "resetting for error %d\n", | |
5068 | hub->error); | |
5069 | ||
742120c6 | 5070 | ret = usb_reset_device(hdev); |
1da177e4 LT |
5071 | if (ret) { |
5072 | dev_dbg (hub_dev, | |
5073 | "error resetting hub: %d\n", ret); | |
40f122f3 | 5074 | goto loop_autopm; |
1da177e4 LT |
5075 | } |
5076 | ||
5077 | hub->nerrors = 0; | |
5078 | hub->error = 0; | |
5079 | } | |
5080 | ||
5081 | /* deal with port status changes */ | |
3bbc47d8 | 5082 | for (i = 1; i <= hdev->maxchild; i++) { |
097a155f | 5083 | struct usb_port *port_dev = hub->ports[i - 1]; |
1da177e4 | 5084 | |
5c79a1e3 DW |
5085 | if (test_bit(i, hub->event_bits) |
5086 | || test_bit(i, hub->change_bits) | |
5087 | || test_bit(i, hub->wakeup_bits)) { | |
1da177e4 | 5088 | /* |
097a155f DW |
5089 | * The get_noresume and barrier ensure that if |
5090 | * the port was in the process of resuming, we | |
5091 | * flush that work and keep the port active for | |
5092 | * the duration of the port_event(). However, | |
5093 | * if the port is runtime pm suspended | |
5094 | * (powered-off), we leave it in that state, run | |
5095 | * an abbreviated port_event(), and move on. | |
1da177e4 | 5096 | */ |
097a155f DW |
5097 | pm_runtime_get_noresume(&port_dev->dev); |
5098 | pm_runtime_barrier(&port_dev->dev); | |
5c79a1e3 | 5099 | usb_lock_port(port_dev); |
af376a46 | 5100 | port_event(hub, i); |
5c79a1e3 | 5101 | usb_unlock_port(port_dev); |
097a155f | 5102 | pm_runtime_put_sync(&port_dev->dev); |
dbe79bbe | 5103 | } |
af376a46 | 5104 | } |
1da177e4 LT |
5105 | |
5106 | /* deal with hub status changes */ | |
5107 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
5108 | ; /* do nothing */ | |
5109 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
5110 | dev_err (hub_dev, "get_hub_status failed\n"); | |
5111 | else { | |
5112 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
5113 | dev_dbg (hub_dev, "power change\n"); | |
5114 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
5115 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
5116 | /* FIXME: Is this always true? */ | |
55c52718 | 5117 | hub->limited_power = 1; |
403fae78 | 5118 | else |
5119 | hub->limited_power = 0; | |
1da177e4 LT |
5120 | } |
5121 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
752d57a8 PB |
5122 | u16 status = 0; |
5123 | u16 unused; | |
5124 | ||
5125 | dev_dbg(hub_dev, "over-current change\n"); | |
1da177e4 | 5126 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
752d57a8 | 5127 | msleep(500); /* Cool down */ |
469271f8 | 5128 | hub_power_on(hub, true); |
752d57a8 PB |
5129 | hub_hub_status(hub, &status, &unused); |
5130 | if (status & HUB_STATUS_OVERCURRENT) | |
5131 | dev_err(hub_dev, "over-current " | |
5132 | "condition\n"); | |
1da177e4 LT |
5133 | } |
5134 | } | |
5135 | ||
8e4ceb38 AS |
5136 | loop_autopm: |
5137 | /* Balance the usb_autopm_get_interface() above */ | |
5138 | usb_autopm_put_interface_no_suspend(intf); | |
5139 | loop: | |
5140 | /* Balance the usb_autopm_get_interface_no_resume() in | |
5141 | * kick_khubd() and allow autosuspend. | |
5142 | */ | |
5143 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 5144 | loop_disconnected: |
1da177e4 | 5145 | usb_unlock_device(hdev); |
c605f3cd | 5146 | usb_put_dev(hdev); |
e8054854 | 5147 | kref_put(&hub->kref, hub_release); |
1da177e4 | 5148 | |
469271f8 | 5149 | } /* end while (1) */ |
1da177e4 LT |
5150 | } |
5151 | ||
5152 | static int hub_thread(void *__unused) | |
5153 | { | |
025d4430 | 5154 | /* khubd needs to be freezable to avoid interfering with USB-PERSIST |
3bb1af52 AS |
5155 | * port handover. Otherwise it might see that a full-speed device |
5156 | * was gone before the EHCI controller had handed its port over to | |
5157 | * the companion full-speed controller. | |
5158 | */ | |
83144186 | 5159 | set_freezable(); |
3bb1af52 | 5160 | |
1da177e4 LT |
5161 | do { |
5162 | hub_events(); | |
e42837bc | 5163 | wait_event_freezable(khubd_wait, |
9c8d6178 | 5164 | !list_empty(&hub_event_list) || |
5165 | kthread_should_stop()); | |
9c8d6178 | 5166 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 5167 | |
9c8d6178 | 5168 | pr_debug("%s: khubd exiting\n", usbcore_name); |
5169 | return 0; | |
1da177e4 LT |
5170 | } |
5171 | ||
1e927d96 | 5172 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 5173 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 5174 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
5175 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
5176 | .bInterfaceClass = USB_CLASS_HUB, | |
5177 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
5178 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
5179 | .bDeviceClass = USB_CLASS_HUB}, | |
5180 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
5181 | .bInterfaceClass = USB_CLASS_HUB}, | |
5182 | { } /* Terminating entry */ | |
5183 | }; | |
5184 | ||
5185 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
5186 | ||
5187 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
5188 | .name = "hub", |
5189 | .probe = hub_probe, | |
5190 | .disconnect = hub_disconnect, | |
5191 | .suspend = hub_suspend, | |
5192 | .resume = hub_resume, | |
f07600cf | 5193 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
5194 | .pre_reset = hub_pre_reset, |
5195 | .post_reset = hub_post_reset, | |
c532b29a | 5196 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 5197 | .id_table = hub_id_table, |
40f122f3 | 5198 | .supports_autosuspend = 1, |
1da177e4 LT |
5199 | }; |
5200 | ||
5201 | int usb_hub_init(void) | |
5202 | { | |
1da177e4 LT |
5203 | if (usb_register(&hub_driver) < 0) { |
5204 | printk(KERN_ERR "%s: can't register hub driver\n", | |
5205 | usbcore_name); | |
5206 | return -1; | |
5207 | } | |
5208 | ||
9c8d6178 | 5209 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
5210 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 5211 | return 0; |
1da177e4 LT |
5212 | |
5213 | /* Fall through if kernel_thread failed */ | |
5214 | usb_deregister(&hub_driver); | |
5215 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
5216 | ||
5217 | return -1; | |
5218 | } | |
5219 | ||
5220 | void usb_hub_cleanup(void) | |
5221 | { | |
9c8d6178 | 5222 | kthread_stop(khubd_task); |
1da177e4 LT |
5223 | |
5224 | /* | |
5225 | * Hub resources are freed for us by usb_deregister. It calls | |
5226 | * usb_driver_purge on every device which in turn calls that | |
5227 | * devices disconnect function if it is using this driver. | |
5228 | * The hub_disconnect function takes care of releasing the | |
5229 | * individual hub resources. -greg | |
5230 | */ | |
5231 | usb_deregister(&hub_driver); | |
5232 | } /* usb_hub_cleanup() */ | |
5233 | ||
eb764c4b | 5234 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5235 | struct usb_device_descriptor *old_device_descriptor, |
5236 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5237 | { |
5238 | int changed = 0; | |
5239 | unsigned index; | |
5240 | unsigned serial_len = 0; | |
5241 | unsigned len; | |
5242 | unsigned old_length; | |
5243 | int length; | |
5244 | char *buf; | |
5245 | ||
5246 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5247 | sizeof(*old_device_descriptor)) != 0) | |
5248 | return 1; | |
5249 | ||
e3376d6c XR |
5250 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5251 | return 1; | |
5252 | if (udev->bos) { | |
b9a10481 XR |
5253 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5254 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5255 | return 1; |
b9a10481 | 5256 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5257 | return 1; |
5258 | } | |
5259 | ||
eb764c4b AS |
5260 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5261 | * device descriptor haven't changed, we will assume the | |
5262 | * Manufacturer and Product strings haven't changed either. | |
5263 | * But the SerialNumber string could be different (e.g., a | |
5264 | * different flash card of the same brand). | |
5265 | */ | |
5266 | if (udev->serial) | |
5267 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5268 | |
eb764c4b | 5269 | len = serial_len; |
1da177e4 | 5270 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5271 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5272 | len = max(len, old_length); | |
1da177e4 | 5273 | } |
eb764c4b | 5274 | |
0cc1a51f | 5275 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
5276 | if (buf == NULL) { |
5277 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
5278 | /* assume the worst */ | |
5279 | return 1; | |
5280 | } | |
5281 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 5282 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5283 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5284 | old_length); | |
eb764c4b | 5285 | if (length != old_length) { |
1da177e4 LT |
5286 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5287 | index, length); | |
eb764c4b | 5288 | changed = 1; |
1da177e4 LT |
5289 | break; |
5290 | } | |
5291 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
5292 | != 0) { | |
5293 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5294 | index, |
5295 | ((struct usb_config_descriptor *) buf)-> | |
5296 | bConfigurationValue); | |
5297 | changed = 1; | |
1da177e4 LT |
5298 | break; |
5299 | } | |
5300 | } | |
eb764c4b AS |
5301 | |
5302 | if (!changed && serial_len) { | |
5303 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5304 | buf, serial_len); | |
5305 | if (length + 1 != serial_len) { | |
5306 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5307 | length); | |
5308 | changed = 1; | |
5309 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5310 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5311 | changed = 1; | |
5312 | } | |
5313 | } | |
5314 | ||
1da177e4 | 5315 | kfree(buf); |
eb764c4b | 5316 | return changed; |
1da177e4 LT |
5317 | } |
5318 | ||
5319 | /** | |
742120c6 | 5320 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5321 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5322 | * | |
79efa097 AS |
5323 | * WARNING - don't use this routine to reset a composite device |
5324 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5325 | * Use usb_reset_device() instead. |
1da177e4 LT |
5326 | * |
5327 | * Do a port reset, reassign the device's address, and establish its | |
5328 | * former operating configuration. If the reset fails, or the device's | |
5329 | * descriptors change from their values before the reset, or the original | |
5330 | * configuration and altsettings cannot be restored, a flag will be set | |
5331 | * telling khubd to pretend the device has been disconnected and then | |
5332 | * re-connected. All drivers will be unbound, and the device will be | |
5333 | * re-enumerated and probed all over again. | |
5334 | * | |
626f090c | 5335 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5336 | * flagged for logical disconnection, or some other negative error code |
5337 | * if the reset wasn't even attempted. | |
5338 | * | |
626f090c | 5339 | * Note: |
5c79a1e3 DW |
5340 | * The caller must own the device lock and the port lock, the latter is |
5341 | * taken by usb_reset_device(). For example, it's safe to use | |
5342 | * usb_reset_device() from a driver probe() routine after downloading | |
5343 | * new firmware. For calls that might not occur during probe(), drivers | |
5344 | * should lock the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5345 | * |
5346 | * Locking exception: This routine may also be called from within an | |
5347 | * autoresume handler. Such usage won't conflict with other tasks | |
5348 | * holding the device lock because these tasks should always call | |
5c79a1e3 DW |
5349 | * usb_autopm_resume_device(), thereby preventing any unwanted |
5350 | * autoresume. The autoresume handler is expected to have already | |
5351 | * acquired the port lock before calling this routine. | |
1da177e4 | 5352 | */ |
742120c6 | 5353 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5354 | { |
5355 | struct usb_device *parent_hdev = udev->parent; | |
5356 | struct usb_hub *parent_hub; | |
3f0479e0 | 5357 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5358 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5359 | struct usb_host_bos *bos; |
7a7b562d | 5360 | int i, j, ret = 0; |
12c3da34 | 5361 | int port1 = udev->portnum; |
1da177e4 LT |
5362 | |
5363 | if (udev->state == USB_STATE_NOTATTACHED || | |
5364 | udev->state == USB_STATE_SUSPENDED) { | |
5365 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5366 | udev->state); | |
5367 | return -EINVAL; | |
5368 | } | |
5369 | ||
5c79a1e3 | 5370 | if (!parent_hdev) |
1da177e4 | 5371 | return -EISDIR; |
5c79a1e3 | 5372 | |
ad493e5e | 5373 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5374 | |
dcc01c08 SS |
5375 | /* Disable USB2 hardware LPM. |
5376 | * It will be re-enabled by the enumeration process. | |
5377 | */ | |
5378 | if (udev->usb2_hw_lpm_enabled == 1) | |
5379 | usb_set_usb2_hardware_lpm(udev, 0); | |
5380 | ||
e3376d6c XR |
5381 | bos = udev->bos; |
5382 | udev->bos = NULL; | |
5383 | ||
f74631e3 SS |
5384 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5385 | * settings. Device-initiated LPM settings, and system exit latency | |
5386 | * settings are cleared when the device is reset, so we have to set | |
5387 | * them up again. | |
6d1d0513 SS |
5388 | */ |
5389 | ret = usb_unlocked_disable_lpm(udev); | |
5390 | if (ret) { | |
5391 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
5392 | goto re_enumerate; | |
5393 | } | |
f74631e3 SS |
5394 | ret = usb_disable_ltm(udev); |
5395 | if (ret) { | |
5396 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5397 | __func__); | |
5398 | goto re_enumerate; | |
5399 | } | |
6d1d0513 | 5400 | |
1da177e4 LT |
5401 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
5402 | ||
5403 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5404 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5405 | usb_ep0_reinit(udev); |
1da177e4 | 5406 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5407 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5408 | break; |
5409 | } | |
d5cbad4b | 5410 | |
1da177e4 LT |
5411 | if (ret < 0) |
5412 | goto re_enumerate; | |
469271f8 | 5413 | |
1da177e4 | 5414 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5415 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5416 | dev_info(&udev->dev, "device firmware changed\n"); |
5417 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5418 | goto re_enumerate; | |
469271f8 | 5419 | } |
4fe0387a AS |
5420 | |
5421 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5422 | if (!udev->actconfig) |
5423 | goto done; | |
3f0479e0 | 5424 | |
d673bfcb | 5425 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5426 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5427 | if (ret < 0) { | |
5428 | dev_warn(&udev->dev, | |
5429 | "Busted HC? Not enough HCD resources for " | |
5430 | "old configuration.\n"); | |
d673bfcb | 5431 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5432 | goto re_enumerate; |
5433 | } | |
1da177e4 LT |
5434 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5435 | USB_REQ_SET_CONFIGURATION, 0, | |
5436 | udev->actconfig->desc.bConfigurationValue, 0, | |
5437 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5438 | if (ret < 0) { | |
5439 | dev_err(&udev->dev, | |
5440 | "can't restore configuration #%d (error=%d)\n", | |
5441 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5442 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5443 | goto re_enumerate; |
469271f8 | 5444 | } |
d673bfcb | 5445 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5446 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5447 | ||
4fe0387a AS |
5448 | /* Put interfaces back into the same altsettings as before. |
5449 | * Don't bother to send the Set-Interface request for interfaces | |
5450 | * that were already in altsetting 0; besides being unnecessary, | |
5451 | * many devices can't handle it. Instead just reset the host-side | |
5452 | * endpoint state. | |
5453 | */ | |
1da177e4 | 5454 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5455 | struct usb_host_config *config = udev->actconfig; |
5456 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5457 | struct usb_interface_descriptor *desc; |
5458 | ||
1da177e4 | 5459 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5460 | if (desc->bAlternateSetting == 0) { |
5461 | usb_disable_interface(udev, intf, true); | |
5462 | usb_enable_interface(udev, intf, true); | |
5463 | ret = 0; | |
5464 | } else { | |
04a723ea SS |
5465 | /* Let the bandwidth allocation function know that this |
5466 | * device has been reset, and it will have to use | |
5467 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5468 | */ |
04a723ea | 5469 | intf->resetting_device = 1; |
4fe0387a AS |
5470 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5471 | desc->bAlternateSetting); | |
04a723ea | 5472 | intf->resetting_device = 0; |
4fe0387a | 5473 | } |
1da177e4 LT |
5474 | if (ret < 0) { |
5475 | dev_err(&udev->dev, "failed to restore interface %d " | |
5476 | "altsetting %d (error=%d)\n", | |
5477 | desc->bInterfaceNumber, | |
5478 | desc->bAlternateSetting, | |
5479 | ret); | |
5480 | goto re_enumerate; | |
5481 | } | |
7a7b562d HG |
5482 | /* Resetting also frees any allocated streams */ |
5483 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) | |
5484 | intf->cur_altsetting->endpoint[j].streams = 0; | |
1da177e4 LT |
5485 | } |
5486 | ||
5487 | done: | |
f74631e3 | 5488 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5489 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5490 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5491 | usb_enable_ltm(udev); |
e3376d6c XR |
5492 | usb_release_bos_descriptor(udev); |
5493 | udev->bos = bos; | |
1da177e4 | 5494 | return 0; |
469271f8 | 5495 | |
1da177e4 | 5496 | re_enumerate: |
6d1d0513 | 5497 | /* LPM state doesn't matter when we're about to destroy the device. */ |
1da177e4 | 5498 | hub_port_logical_disconnect(parent_hub, port1); |
e3376d6c XR |
5499 | usb_release_bos_descriptor(udev); |
5500 | udev->bos = bos; | |
1da177e4 LT |
5501 | return -ENODEV; |
5502 | } | |
79efa097 AS |
5503 | |
5504 | /** | |
742120c6 | 5505 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5506 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5507 | * |
5508 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5509 | * method), performs the port reset, and then lets the drivers know that | |
5510 | * the reset is over (using their post_reset method). | |
5511 | * | |
626f090c | 5512 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5513 | * |
626f090c | 5514 | * Note: |
79efa097 AS |
5515 | * The caller must own the device lock. For example, it's safe to use |
5516 | * this from a driver probe() routine after downloading new firmware. | |
5517 | * For calls that might not occur during probe(), drivers should lock | |
5518 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5519 | * |
5520 | * If an interface is currently being probed or disconnected, we assume | |
5521 | * its driver knows how to handle resets. For all other interfaces, | |
5522 | * if the driver doesn't have pre_reset and post_reset methods then | |
5523 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5524 | */ |
742120c6 | 5525 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5526 | { |
5527 | int ret; | |
852c4b43 | 5528 | int i; |
4d769def | 5529 | unsigned int noio_flag; |
5c79a1e3 | 5530 | struct usb_port *port_dev; |
79efa097 | 5531 | struct usb_host_config *config = udev->actconfig; |
5c79a1e3 | 5532 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
79efa097 AS |
5533 | |
5534 | if (udev->state == USB_STATE_NOTATTACHED || | |
5535 | udev->state == USB_STATE_SUSPENDED) { | |
5536 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5537 | udev->state); | |
5538 | return -EINVAL; | |
5539 | } | |
5540 | ||
5c79a1e3 DW |
5541 | if (!udev->parent) { |
5542 | /* this requires hcd-specific logic; see ohci_restart() */ | |
5543 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); | |
5544 | return -EISDIR; | |
5545 | } | |
5546 | ||
5547 | port_dev = hub->ports[udev->portnum - 1]; | |
5548 | ||
4d769def ML |
5549 | /* |
5550 | * Don't allocate memory with GFP_KERNEL in current | |
5551 | * context to avoid possible deadlock if usb mass | |
5552 | * storage interface or usbnet interface(iSCSI case) | |
5553 | * is included in current configuration. The easist | |
5554 | * approach is to do it for every device reset, | |
5555 | * because the device 'memalloc_noio' flag may have | |
5556 | * not been set before reseting the usb device. | |
5557 | */ | |
5558 | noio_flag = memalloc_noio_save(); | |
5559 | ||
645daaab | 5560 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5561 | usb_autoresume_device(udev); |
645daaab | 5562 | |
79efa097 | 5563 | if (config) { |
79efa097 | 5564 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5565 | struct usb_interface *cintf = config->interface[i]; |
5566 | struct usb_driver *drv; | |
78d9a487 | 5567 | int unbind = 0; |
852c4b43 AS |
5568 | |
5569 | if (cintf->dev.driver) { | |
79efa097 | 5570 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5571 | if (drv->pre_reset && drv->post_reset) |
5572 | unbind = (drv->pre_reset)(cintf); | |
5573 | else if (cintf->condition == | |
5574 | USB_INTERFACE_BOUND) | |
5575 | unbind = 1; | |
5576 | if (unbind) | |
5577 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5578 | } |
5579 | } | |
5580 | } | |
5581 | ||
5c79a1e3 | 5582 | usb_lock_port(port_dev); |
742120c6 | 5583 | ret = usb_reset_and_verify_device(udev); |
5c79a1e3 | 5584 | usb_unlock_port(port_dev); |
79efa097 AS |
5585 | |
5586 | if (config) { | |
79efa097 | 5587 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5588 | struct usb_interface *cintf = config->interface[i]; |
5589 | struct usb_driver *drv; | |
78d9a487 | 5590 | int rebind = cintf->needs_binding; |
852c4b43 | 5591 | |
78d9a487 | 5592 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5593 | drv = to_usb_driver(cintf->dev.driver); |
5594 | if (drv->post_reset) | |
78d9a487 AS |
5595 | rebind = (drv->post_reset)(cintf); |
5596 | else if (cintf->condition == | |
5597 | USB_INTERFACE_BOUND) | |
5598 | rebind = 1; | |
6aec044c AS |
5599 | if (rebind) |
5600 | cintf->needs_binding = 1; | |
79efa097 | 5601 | } |
79efa097 | 5602 | } |
6aec044c | 5603 | usb_unbind_and_rebind_marked_interfaces(udev); |
79efa097 AS |
5604 | } |
5605 | ||
94fcda1f | 5606 | usb_autosuspend_device(udev); |
4d769def | 5607 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5608 | return ret; |
5609 | } | |
742120c6 | 5610 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5611 | |
5612 | ||
5613 | /** | |
5614 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5615 | * @iface: USB interface belonging to the device to reset | |
5616 | * | |
5617 | * This function can be used to reset a USB device from an atomic | |
5618 | * context, where usb_reset_device() won't work (as it blocks). | |
5619 | * | |
5620 | * Doing a reset via this method is functionally equivalent to calling | |
5621 | * usb_reset_device(), except for the fact that it is delayed to a | |
5622 | * workqueue. This means that any drivers bound to other interfaces | |
5623 | * might be unbound, as well as users from usbfs in user space. | |
5624 | * | |
5625 | * Corner cases: | |
5626 | * | |
5627 | * - Scheduling two resets at the same time from two different drivers | |
5628 | * attached to two different interfaces of the same device is | |
5629 | * possible; depending on how the driver attached to each interface | |
5630 | * handles ->pre_reset(), the second reset might happen or not. | |
5631 | * | |
5632 | * - If a driver is unbound and it had a pending reset, the reset will | |
5633 | * be cancelled. | |
5634 | * | |
5635 | * - This function can be called during .probe() or .disconnect() | |
5636 | * times. On return from .disconnect(), any pending resets will be | |
5637 | * cancelled. | |
5638 | * | |
5639 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
5640 | * does its own. | |
5641 | * | |
5642 | * NOTE: We don't do any reference count tracking because it is not | |
5643 | * needed. The lifecycle of the work_struct is tied to the | |
5644 | * usb_interface. Before destroying the interface we cancel the | |
5645 | * work_struct, so the fact that work_struct is queued and or | |
5646 | * running means the interface (and thus, the device) exist and | |
5647 | * are referenced. | |
5648 | */ | |
5649 | void usb_queue_reset_device(struct usb_interface *iface) | |
5650 | { | |
5651 | schedule_work(&iface->reset_ws); | |
5652 | } | |
5653 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5654 | |
5655 | /** | |
5656 | * usb_hub_find_child - Get the pointer of child device | |
5657 | * attached to the port which is specified by @port1. | |
5658 | * @hdev: USB device belonging to the usb hub | |
5659 | * @port1: port num to indicate which port the child device | |
5660 | * is attached to. | |
5661 | * | |
5662 | * USB drivers call this function to get hub's child device | |
5663 | * pointer. | |
5664 | * | |
626f090c | 5665 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5666 | * child's usb_device pointer if non-NULL. |
5667 | */ | |
5668 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5669 | int port1) | |
5670 | { | |
ad493e5e | 5671 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5672 | |
5673 | if (port1 < 1 || port1 > hdev->maxchild) | |
5674 | return NULL; | |
5675 | return hub->ports[port1 - 1]->child; | |
5676 | } | |
5677 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5678 | |
d2123fd9 LT |
5679 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5680 | struct usb_hub_descriptor *desc) | |
5681 | { | |
d99f6b41 | 5682 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d2123fd9 LT |
5683 | enum usb_port_connect_type connect_type; |
5684 | int i; | |
5685 | ||
d99f6b41 DW |
5686 | if (!hub) |
5687 | return; | |
5688 | ||
d2123fd9 LT |
5689 | if (!hub_is_superspeed(hdev)) { |
5690 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5691 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5692 | |
d99f6b41 | 5693 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5694 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5695 | u8 mask = 1 << (i%8); | |
5696 | ||
5697 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
d99f6b41 | 5698 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5699 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
5700 | } | |
5701 | } | |
5702 | } | |
5703 | } else { | |
5704 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5705 | ||
5706 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5707 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5708 | |
d99f6b41 | 5709 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5710 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5711 | u16 mask = 1 << i; | |
5712 | ||
5713 | if (!(port_removable & mask)) { | |
d99f6b41 | 5714 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5715 | port_removable |= mask; |
5716 | } | |
5717 | } | |
5718 | } | |
5719 | ||
5720 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5721 | } | |
5722 | } | |
5723 | ||
d5575424 LT |
5724 | #ifdef CONFIG_ACPI |
5725 | /** | |
5726 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5727 | * @hdev: USB device belonging to the usb hub | |
5728 | * @port1: port num of the port | |
5729 | * | |
626f090c YB |
5730 | * Return: Port's acpi handle if successful, %NULL if params are |
5731 | * invalid. | |
d5575424 LT |
5732 | */ |
5733 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5734 | int port1) | |
5735 | { | |
ad493e5e | 5736 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5737 | |
41341261 MN |
5738 | if (!hub) |
5739 | return NULL; | |
5740 | ||
3a83f992 | 5741 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5742 | } |
5743 | #endif |