Commit | Line | Data |
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ddae41be GKH |
1 | /* |
2 | * drivers/usb/driver.c - most of the driver model stuff for usb | |
3 | * | |
4 | * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> | |
5 | * | |
6 | * based on drivers/usb/usb.c which had the following copyrights: | |
7 | * (C) Copyright Linus Torvalds 1999 | |
8 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
9 | * (C) Copyright Andreas Gal 1999 | |
10 | * (C) Copyright Gregory P. Smith 1999 | |
11 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) | |
12 | * (C) Copyright Randy Dunlap 2000 | |
13 | * (C) Copyright David Brownell 2000-2004 | |
14 | * (C) Copyright Yggdrasil Computing, Inc. 2000 | |
15 | * (usb_device_id matching changes by Adam J. Richter) | |
16 | * (C) Copyright Greg Kroah-Hartman 2002-2003 | |
17 | * | |
18 | * NOTE! This is not actually a driver at all, rather this is | |
19 | * just a collection of helper routines that implement the | |
36e56a34 AS |
20 | * matching, probing, releasing, suspending and resuming for |
21 | * real drivers. | |
ddae41be GKH |
22 | * |
23 | */ | |
24 | ||
ddae41be GKH |
25 | #include <linux/device.h> |
26 | #include <linux/usb.h> | |
6bc6cff5 | 27 | #include <linux/usb/quirks.h> |
bd859281 | 28 | #include <linux/workqueue.h> |
ddae41be GKH |
29 | #include "hcd.h" |
30 | #include "usb.h" | |
31 | ||
20dfdad7 AS |
32 | #define VERBOSE_DEBUG 0 |
33 | ||
34 | #if VERBOSE_DEBUG | |
35 | #define dev_vdbg dev_dbg | |
36 | #else | |
37 | #define dev_vdbg(dev, fmt, args...) do { } while (0) | |
38 | #endif | |
39 | ||
733260ff GKH |
40 | #ifdef CONFIG_HOTPLUG |
41 | ||
42 | /* | |
43 | * Adds a new dynamic USBdevice ID to this driver, | |
44 | * and cause the driver to probe for all devices again. | |
45 | */ | |
93bacefc GKH |
46 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
47 | struct device_driver *driver, | |
48 | const char *buf, size_t count) | |
733260ff | 49 | { |
733260ff GKH |
50 | struct usb_dynid *dynid; |
51 | u32 idVendor = 0; | |
52 | u32 idProduct = 0; | |
53 | int fields = 0; | |
1b21d5e1 | 54 | int retval = 0; |
733260ff GKH |
55 | |
56 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
57 | if (fields < 2) | |
58 | return -EINVAL; | |
59 | ||
60 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
61 | if (!dynid) | |
62 | return -ENOMEM; | |
63 | ||
64 | INIT_LIST_HEAD(&dynid->node); | |
65 | dynid->id.idVendor = idVendor; | |
66 | dynid->id.idProduct = idProduct; | |
67 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; | |
68 | ||
93bacefc GKH |
69 | spin_lock(&dynids->lock); |
70 | list_add_tail(&dynids->list, &dynid->node); | |
71 | spin_unlock(&dynids->lock); | |
733260ff GKH |
72 | |
73 | if (get_driver(driver)) { | |
1b21d5e1 | 74 | retval = driver_attach(driver); |
733260ff GKH |
75 | put_driver(driver); |
76 | } | |
77 | ||
1b21d5e1 GKH |
78 | if (retval) |
79 | return retval; | |
733260ff GKH |
80 | return count; |
81 | } | |
93bacefc GKH |
82 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
83 | ||
84 | static ssize_t store_new_id(struct device_driver *driver, | |
85 | const char *buf, size_t count) | |
86 | { | |
87 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
88 | ||
89 | return usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
90 | } | |
733260ff GKH |
91 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
92 | ||
93 | static int usb_create_newid_file(struct usb_driver *usb_drv) | |
94 | { | |
95 | int error = 0; | |
96 | ||
ba9dc657 GKH |
97 | if (usb_drv->no_dynamic_id) |
98 | goto exit; | |
99 | ||
733260ff | 100 | if (usb_drv->probe != NULL) |
8bb54ab5 | 101 | error = sysfs_create_file(&usb_drv->drvwrap.driver.kobj, |
733260ff | 102 | &driver_attr_new_id.attr); |
ba9dc657 | 103 | exit: |
733260ff GKH |
104 | return error; |
105 | } | |
106 | ||
ba9dc657 GKH |
107 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
108 | { | |
109 | if (usb_drv->no_dynamic_id) | |
110 | return; | |
111 | ||
112 | if (usb_drv->probe != NULL) | |
8bb54ab5 | 113 | sysfs_remove_file(&usb_drv->drvwrap.driver.kobj, |
ba9dc657 GKH |
114 | &driver_attr_new_id.attr); |
115 | } | |
116 | ||
733260ff GKH |
117 | static void usb_free_dynids(struct usb_driver *usb_drv) |
118 | { | |
119 | struct usb_dynid *dynid, *n; | |
120 | ||
121 | spin_lock(&usb_drv->dynids.lock); | |
122 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
123 | list_del(&dynid->node); | |
124 | kfree(dynid); | |
125 | } | |
126 | spin_unlock(&usb_drv->dynids.lock); | |
127 | } | |
128 | #else | |
129 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
ba9dc657 GKH |
134 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
135 | { | |
136 | } | |
137 | ||
733260ff GKH |
138 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
139 | { | |
140 | } | |
141 | #endif | |
142 | ||
143 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
144 | struct usb_driver *drv) | |
145 | { | |
146 | struct usb_dynid *dynid; | |
147 | ||
148 | spin_lock(&drv->dynids.lock); | |
149 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
150 | if (usb_match_one_id(intf, &dynid->id)) { | |
151 | spin_unlock(&drv->dynids.lock); | |
152 | return &dynid->id; | |
153 | } | |
154 | } | |
155 | spin_unlock(&drv->dynids.lock); | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | ||
8bb54ab5 AS |
160 | /* called from driver core with dev locked */ |
161 | static int usb_probe_device(struct device *dev) | |
162 | { | |
163 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
164 | struct usb_device *udev; | |
165 | int error = -ENODEV; | |
166 | ||
167 | dev_dbg(dev, "%s\n", __FUNCTION__); | |
168 | ||
169 | if (!is_usb_device(dev)) /* Sanity check */ | |
170 | return error; | |
171 | ||
172 | udev = to_usb_device(dev); | |
173 | ||
8bb54ab5 AS |
174 | /* TODO: Add real matching code */ |
175 | ||
645daaab AS |
176 | /* The device should always appear to be in use |
177 | * unless the driver suports autosuspend. | |
178 | */ | |
179 | udev->pm_usage_cnt = !(udriver->supports_autosuspend); | |
180 | ||
8bb54ab5 AS |
181 | error = udriver->probe(udev); |
182 | return error; | |
183 | } | |
184 | ||
185 | /* called from driver core with dev locked */ | |
186 | static int usb_unbind_device(struct device *dev) | |
187 | { | |
188 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
189 | ||
190 | udriver->disconnect(to_usb_device(dev)); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | ||
195 | /* called from driver core with dev locked */ | |
ddae41be GKH |
196 | static int usb_probe_interface(struct device *dev) |
197 | { | |
8bb54ab5 AS |
198 | struct usb_driver *driver = to_usb_driver(dev->driver); |
199 | struct usb_interface *intf; | |
645daaab | 200 | struct usb_device *udev; |
ddae41be GKH |
201 | const struct usb_device_id *id; |
202 | int error = -ENODEV; | |
203 | ||
204 | dev_dbg(dev, "%s\n", __FUNCTION__); | |
205 | ||
8bb54ab5 | 206 | if (is_usb_device(dev)) /* Sanity check */ |
ddae41be | 207 | return error; |
8bb54ab5 AS |
208 | |
209 | intf = to_usb_interface(dev); | |
645daaab | 210 | udev = interface_to_usbdev(intf); |
ddae41be GKH |
211 | |
212 | id = usb_match_id(intf, driver->id_table); | |
733260ff GKH |
213 | if (!id) |
214 | id = usb_match_dynamic_id(intf, driver); | |
ddae41be GKH |
215 | if (id) { |
216 | dev_dbg(dev, "%s - got id\n", __FUNCTION__); | |
217 | ||
94fcda1f | 218 | error = usb_autoresume_device(udev); |
645daaab AS |
219 | if (error) |
220 | return error; | |
221 | ||
ddae41be GKH |
222 | /* Interface "power state" doesn't correspond to any hardware |
223 | * state whatsoever. We use it to record when it's bound to | |
224 | * a driver that may start I/0: it's not frozen/quiesced. | |
225 | */ | |
226 | mark_active(intf); | |
227 | intf->condition = USB_INTERFACE_BINDING; | |
645daaab AS |
228 | |
229 | /* The interface should always appear to be in use | |
230 | * unless the driver suports autosuspend. | |
231 | */ | |
232 | intf->pm_usage_cnt = !(driver->supports_autosuspend); | |
233 | ||
ddae41be GKH |
234 | error = driver->probe(intf, id); |
235 | if (error) { | |
236 | mark_quiesced(intf); | |
645daaab | 237 | intf->needs_remote_wakeup = 0; |
ddae41be GKH |
238 | intf->condition = USB_INTERFACE_UNBOUND; |
239 | } else | |
240 | intf->condition = USB_INTERFACE_BOUND; | |
645daaab | 241 | |
94fcda1f | 242 | usb_autosuspend_device(udev); |
ddae41be GKH |
243 | } |
244 | ||
245 | return error; | |
246 | } | |
247 | ||
8bb54ab5 | 248 | /* called from driver core with dev locked */ |
ddae41be GKH |
249 | static int usb_unbind_interface(struct device *dev) |
250 | { | |
8bb54ab5 | 251 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 252 | struct usb_interface *intf = to_usb_interface(dev); |
645daaab AS |
253 | struct usb_device *udev; |
254 | int error; | |
ddae41be GKH |
255 | |
256 | intf->condition = USB_INTERFACE_UNBINDING; | |
257 | ||
645daaab AS |
258 | /* Autoresume for set_interface call below */ |
259 | udev = interface_to_usbdev(intf); | |
94fcda1f | 260 | error = usb_autoresume_device(udev); |
645daaab | 261 | |
ddae41be GKH |
262 | /* release all urbs for this interface */ |
263 | usb_disable_interface(interface_to_usbdev(intf), intf); | |
264 | ||
8bb54ab5 | 265 | driver->disconnect(intf); |
ddae41be GKH |
266 | |
267 | /* reset other interface state */ | |
268 | usb_set_interface(interface_to_usbdev(intf), | |
269 | intf->altsetting[0].desc.bInterfaceNumber, | |
270 | 0); | |
271 | usb_set_intfdata(intf, NULL); | |
645daaab | 272 | |
ddae41be GKH |
273 | intf->condition = USB_INTERFACE_UNBOUND; |
274 | mark_quiesced(intf); | |
645daaab AS |
275 | intf->needs_remote_wakeup = 0; |
276 | ||
277 | if (!error) | |
94fcda1f | 278 | usb_autosuspend_device(udev); |
ddae41be GKH |
279 | |
280 | return 0; | |
281 | } | |
282 | ||
36e56a34 AS |
283 | /** |
284 | * usb_driver_claim_interface - bind a driver to an interface | |
285 | * @driver: the driver to be bound | |
286 | * @iface: the interface to which it will be bound; must be in the | |
287 | * usb device's active configuration | |
288 | * @priv: driver data associated with that interface | |
289 | * | |
290 | * This is used by usb device drivers that need to claim more than one | |
291 | * interface on a device when probing (audio and acm are current examples). | |
292 | * No device driver should directly modify internal usb_interface or | |
293 | * usb_device structure members. | |
294 | * | |
295 | * Few drivers should need to use this routine, since the most natural | |
296 | * way to bind to an interface is to return the private data from | |
297 | * the driver's probe() method. | |
298 | * | |
341487a8 GKH |
299 | * Callers must own the device lock, so driver probe() entries don't need |
300 | * extra locking, but other call contexts may need to explicitly claim that | |
301 | * lock. | |
36e56a34 AS |
302 | */ |
303 | int usb_driver_claim_interface(struct usb_driver *driver, | |
304 | struct usb_interface *iface, void* priv) | |
305 | { | |
306 | struct device *dev = &iface->dev; | |
645daaab | 307 | struct usb_device *udev = interface_to_usbdev(iface); |
1b21d5e1 | 308 | int retval = 0; |
36e56a34 AS |
309 | |
310 | if (dev->driver) | |
311 | return -EBUSY; | |
312 | ||
8bb54ab5 | 313 | dev->driver = &driver->drvwrap.driver; |
36e56a34 | 314 | usb_set_intfdata(iface, priv); |
645daaab | 315 | |
e0318ebf | 316 | usb_pm_lock(udev); |
36e56a34 AS |
317 | iface->condition = USB_INTERFACE_BOUND; |
318 | mark_active(iface); | |
645daaab | 319 | iface->pm_usage_cnt = !(driver->supports_autosuspend); |
e0318ebf | 320 | usb_pm_unlock(udev); |
36e56a34 AS |
321 | |
322 | /* if interface was already added, bind now; else let | |
323 | * the future device_add() bind it, bypassing probe() | |
324 | */ | |
325 | if (device_is_registered(dev)) | |
1b21d5e1 | 326 | retval = device_bind_driver(dev); |
36e56a34 | 327 | |
1b21d5e1 | 328 | return retval; |
36e56a34 AS |
329 | } |
330 | EXPORT_SYMBOL(usb_driver_claim_interface); | |
331 | ||
332 | /** | |
333 | * usb_driver_release_interface - unbind a driver from an interface | |
334 | * @driver: the driver to be unbound | |
335 | * @iface: the interface from which it will be unbound | |
336 | * | |
337 | * This can be used by drivers to release an interface without waiting | |
338 | * for their disconnect() methods to be called. In typical cases this | |
339 | * also causes the driver disconnect() method to be called. | |
340 | * | |
341 | * This call is synchronous, and may not be used in an interrupt context. | |
341487a8 GKH |
342 | * Callers must own the device lock, so driver disconnect() entries don't |
343 | * need extra locking, but other call contexts may need to explicitly claim | |
344 | * that lock. | |
36e56a34 AS |
345 | */ |
346 | void usb_driver_release_interface(struct usb_driver *driver, | |
347 | struct usb_interface *iface) | |
348 | { | |
349 | struct device *dev = &iface->dev; | |
645daaab | 350 | struct usb_device *udev = interface_to_usbdev(iface); |
36e56a34 AS |
351 | |
352 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 353 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
354 | return; |
355 | ||
356 | /* don't release from within disconnect() */ | |
357 | if (iface->condition != USB_INTERFACE_BOUND) | |
358 | return; | |
359 | ||
360 | /* don't release if the interface hasn't been added yet */ | |
361 | if (device_is_registered(dev)) { | |
362 | iface->condition = USB_INTERFACE_UNBINDING; | |
363 | device_release_driver(dev); | |
364 | } | |
365 | ||
366 | dev->driver = NULL; | |
367 | usb_set_intfdata(iface, NULL); | |
645daaab | 368 | |
e0318ebf | 369 | usb_pm_lock(udev); |
36e56a34 AS |
370 | iface->condition = USB_INTERFACE_UNBOUND; |
371 | mark_quiesced(iface); | |
645daaab | 372 | iface->needs_remote_wakeup = 0; |
e0318ebf | 373 | usb_pm_unlock(udev); |
36e56a34 AS |
374 | } |
375 | EXPORT_SYMBOL(usb_driver_release_interface); | |
376 | ||
733260ff | 377 | /* returns 0 if no match, 1 if match */ |
bb417020 | 378 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
733260ff | 379 | { |
733260ff GKH |
380 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
381 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
382 | return 0; | |
383 | ||
384 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
385 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
386 | return 0; | |
387 | ||
388 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
389 | greater than any unsigned number. */ | |
390 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
391 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
392 | return 0; | |
393 | ||
394 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
395 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
396 | return 0; | |
397 | ||
398 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
399 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
400 | return 0; | |
401 | ||
402 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
403 | (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) | |
404 | return 0; | |
405 | ||
406 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
407 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
408 | return 0; | |
409 | ||
bb417020 GKH |
410 | return 1; |
411 | } | |
412 | ||
413 | /* returns 0 if no match, 1 if match */ | |
414 | int usb_match_one_id(struct usb_interface *interface, | |
415 | const struct usb_device_id *id) | |
416 | { | |
417 | struct usb_host_interface *intf; | |
418 | struct usb_device *dev; | |
419 | ||
420 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
421 | if (id == NULL) | |
422 | return 0; | |
423 | ||
424 | intf = interface->cur_altsetting; | |
425 | dev = interface_to_usbdev(interface); | |
426 | ||
427 | if (!usb_match_device(dev, id)) | |
428 | return 0; | |
429 | ||
93c8bf45 AS |
430 | /* The interface class, subclass, and protocol should never be |
431 | * checked for a match if the device class is Vendor Specific, | |
432 | * unless the match record specifies the Vendor ID. */ | |
433 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && | |
434 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
435 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | | |
436 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
437 | USB_DEVICE_ID_MATCH_INT_PROTOCOL))) | |
438 | return 0; | |
439 | ||
733260ff GKH |
440 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
441 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
442 | return 0; | |
443 | ||
444 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
445 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
446 | return 0; | |
447 | ||
448 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
449 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
450 | return 0; | |
451 | ||
452 | return 1; | |
453 | } | |
93bacefc GKH |
454 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
455 | ||
ddae41be GKH |
456 | /** |
457 | * usb_match_id - find first usb_device_id matching device or interface | |
458 | * @interface: the interface of interest | |
459 | * @id: array of usb_device_id structures, terminated by zero entry | |
460 | * | |
461 | * usb_match_id searches an array of usb_device_id's and returns | |
462 | * the first one matching the device or interface, or null. | |
463 | * This is used when binding (or rebinding) a driver to an interface. | |
464 | * Most USB device drivers will use this indirectly, through the usb core, | |
465 | * but some layered driver frameworks use it directly. | |
466 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
467 | * modutils, to support the driver loading functionality of USB hotplugging. | |
468 | * | |
469 | * What Matches: | |
470 | * | |
471 | * The "match_flags" element in a usb_device_id controls which | |
472 | * members are used. If the corresponding bit is set, the | |
473 | * value in the device_id must match its corresponding member | |
474 | * in the device or interface descriptor, or else the device_id | |
475 | * does not match. | |
476 | * | |
477 | * "driver_info" is normally used only by device drivers, | |
478 | * but you can create a wildcard "matches anything" usb_device_id | |
479 | * as a driver's "modules.usbmap" entry if you provide an id with | |
480 | * only a nonzero "driver_info" field. If you do this, the USB device | |
481 | * driver's probe() routine should use additional intelligence to | |
482 | * decide whether to bind to the specified interface. | |
483 | * | |
484 | * What Makes Good usb_device_id Tables: | |
485 | * | |
486 | * The match algorithm is very simple, so that intelligence in | |
487 | * driver selection must come from smart driver id records. | |
488 | * Unless you have good reasons to use another selection policy, | |
489 | * provide match elements only in related groups, and order match | |
490 | * specifiers from specific to general. Use the macros provided | |
491 | * for that purpose if you can. | |
492 | * | |
493 | * The most specific match specifiers use device descriptor | |
494 | * data. These are commonly used with product-specific matches; | |
495 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
496 | * and you can also match against ranges of product revisions. | |
497 | * These are widely used for devices with application or vendor | |
498 | * specific bDeviceClass values. | |
499 | * | |
500 | * Matches based on device class/subclass/protocol specifications | |
501 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
502 | * its siblings. These are used with single-function devices | |
503 | * where bDeviceClass doesn't specify that each interface has | |
504 | * its own class. | |
505 | * | |
506 | * Matches based on interface class/subclass/protocol are the | |
507 | * most general; they let drivers bind to any interface on a | |
508 | * multiple-function device. Use the USB_INTERFACE_INFO | |
509 | * macro, or its siblings, to match class-per-interface style | |
93c8bf45 AS |
510 | * devices (as recorded in bInterfaceClass). |
511 | * | |
512 | * Note that an entry created by USB_INTERFACE_INFO won't match | |
513 | * any interface if the device class is set to Vendor-Specific. | |
514 | * This is deliberate; according to the USB spec the meanings of | |
515 | * the interface class/subclass/protocol for these devices are also | |
516 | * vendor-specific, and hence matching against a standard product | |
517 | * class wouldn't work anyway. If you really want to use an | |
518 | * interface-based match for such a device, create a match record | |
519 | * that also specifies the vendor ID. (Unforunately there isn't a | |
520 | * standard macro for creating records like this.) | |
ddae41be GKH |
521 | * |
522 | * Within those groups, remember that not all combinations are | |
523 | * meaningful. For example, don't give a product version range | |
524 | * without vendor and product IDs; or specify a protocol without | |
525 | * its associated class and subclass. | |
526 | */ | |
527 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
528 | const struct usb_device_id *id) | |
529 | { | |
ddae41be GKH |
530 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
531 | if (id == NULL) | |
532 | return NULL; | |
533 | ||
ddae41be GKH |
534 | /* It is important to check that id->driver_info is nonzero, |
535 | since an entry that is all zeroes except for a nonzero | |
536 | id->driver_info is the way to create an entry that | |
537 | indicates that the driver want to examine every | |
538 | device and interface. */ | |
539 | for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass || | |
540 | id->driver_info; id++) { | |
733260ff GKH |
541 | if (usb_match_one_id(interface, id)) |
542 | return id; | |
ddae41be GKH |
543 | } |
544 | ||
545 | return NULL; | |
546 | } | |
b87ba0a3 | 547 | EXPORT_SYMBOL_GPL_FUTURE(usb_match_id); |
ddae41be | 548 | |
8bb22d2b | 549 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
ddae41be | 550 | { |
8bb54ab5 AS |
551 | /* devices and interfaces are handled separately */ |
552 | if (is_usb_device(dev)) { | |
ddae41be | 553 | |
8bb54ab5 AS |
554 | /* interface drivers never match devices */ |
555 | if (!is_usb_device_driver(drv)) | |
556 | return 0; | |
ddae41be | 557 | |
8bb54ab5 | 558 | /* TODO: Add real matching code */ |
ddae41be GKH |
559 | return 1; |
560 | ||
8bb54ab5 AS |
561 | } else { |
562 | struct usb_interface *intf; | |
563 | struct usb_driver *usb_drv; | |
564 | const struct usb_device_id *id; | |
565 | ||
566 | /* device drivers never match interfaces */ | |
567 | if (is_usb_device_driver(drv)) | |
568 | return 0; | |
569 | ||
570 | intf = to_usb_interface(dev); | |
571 | usb_drv = to_usb_driver(drv); | |
572 | ||
573 | id = usb_match_id(intf, usb_drv->id_table); | |
574 | if (id) | |
575 | return 1; | |
576 | ||
577 | id = usb_match_dynamic_id(intf, usb_drv); | |
578 | if (id) | |
579 | return 1; | |
580 | } | |
581 | ||
ddae41be GKH |
582 | return 0; |
583 | } | |
584 | ||
36e56a34 | 585 | #ifdef CONFIG_HOTPLUG |
36e56a34 AS |
586 | static int usb_uevent(struct device *dev, char **envp, int num_envp, |
587 | char *buffer, int buffer_size) | |
588 | { | |
36e56a34 | 589 | struct usb_device *usb_dev; |
36e56a34 AS |
590 | int i = 0; |
591 | int length = 0; | |
592 | ||
593 | if (!dev) | |
594 | return -ENODEV; | |
595 | ||
596 | /* driver is often null here; dev_dbg() would oops */ | |
597 | pr_debug ("usb %s: uevent\n", dev->bus_id); | |
598 | ||
9f8b17e6 | 599 | if (is_usb_device(dev)) |
782da727 | 600 | usb_dev = to_usb_device(dev); |
9f8b17e6 KS |
601 | else { |
602 | struct usb_interface *intf = to_usb_interface(dev); | |
8bb54ab5 | 603 | usb_dev = interface_to_usbdev(intf); |
8bb54ab5 | 604 | } |
36e56a34 AS |
605 | |
606 | if (usb_dev->devnum < 0) { | |
607 | pr_debug ("usb %s: already deleted?\n", dev->bus_id); | |
608 | return -ENODEV; | |
609 | } | |
610 | if (!usb_dev->bus) { | |
611 | pr_debug ("usb %s: bus removed?\n", dev->bus_id); | |
612 | return -ENODEV; | |
613 | } | |
614 | ||
615 | #ifdef CONFIG_USB_DEVICEFS | |
616 | /* If this is available, userspace programs can directly read | |
617 | * all the device descriptors we don't tell them about. Or | |
9f8b17e6 | 618 | * act as usermode drivers. |
36e56a34 AS |
619 | */ |
620 | if (add_uevent_var(envp, num_envp, &i, | |
621 | buffer, buffer_size, &length, | |
622 | "DEVICE=/proc/bus/usb/%03d/%03d", | |
623 | usb_dev->bus->busnum, usb_dev->devnum)) | |
624 | return -ENOMEM; | |
625 | #endif | |
626 | ||
627 | /* per-device configurations are common */ | |
628 | if (add_uevent_var(envp, num_envp, &i, | |
629 | buffer, buffer_size, &length, | |
630 | "PRODUCT=%x/%x/%x", | |
631 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
632 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
633 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
634 | return -ENOMEM; | |
635 | ||
636 | /* class-based driver binding models */ | |
637 | if (add_uevent_var(envp, num_envp, &i, | |
638 | buffer, buffer_size, &length, | |
639 | "TYPE=%d/%d/%d", | |
640 | usb_dev->descriptor.bDeviceClass, | |
641 | usb_dev->descriptor.bDeviceSubClass, | |
642 | usb_dev->descriptor.bDeviceProtocol)) | |
643 | return -ENOMEM; | |
644 | ||
9f8b17e6 | 645 | if (add_uevent_var(envp, num_envp, &i, |
36e56a34 | 646 | buffer, buffer_size, &length, |
9f8b17e6 KS |
647 | "BUSNUM=%03d", |
648 | usb_dev->bus->busnum)) | |
649 | return -ENOMEM; | |
36e56a34 | 650 | |
9f8b17e6 | 651 | if (add_uevent_var(envp, num_envp, &i, |
36e56a34 | 652 | buffer, buffer_size, &length, |
9f8b17e6 KS |
653 | "DEVNUM=%03d", |
654 | usb_dev->devnum)) | |
655 | return -ENOMEM; | |
36e56a34 AS |
656 | |
657 | envp[i] = NULL; | |
36e56a34 AS |
658 | return 0; |
659 | } | |
660 | ||
661 | #else | |
662 | ||
663 | static int usb_uevent(struct device *dev, char **envp, | |
9f8b17e6 | 664 | int num_envp, char *buffer, int buffer_size) |
36e56a34 AS |
665 | { |
666 | return -ENODEV; | |
667 | } | |
36e56a34 AS |
668 | #endif /* CONFIG_HOTPLUG */ |
669 | ||
ddae41be | 670 | /** |
8bb54ab5 AS |
671 | * usb_register_device_driver - register a USB device (not interface) driver |
672 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 673 | * @owner: module owner of this driver. |
ddae41be | 674 | * |
8bb54ab5 AS |
675 | * Registers a USB device driver with the USB core. The list of |
676 | * unattached devices will be rescanned whenever a new driver is | |
677 | * added, allowing the new driver to attach to any recognized devices. | |
678 | * Returns a negative error code on failure and 0 on success. | |
679 | */ | |
680 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
681 | struct module *owner) | |
682 | { | |
683 | int retval = 0; | |
684 | ||
685 | if (usb_disabled()) | |
686 | return -ENODEV; | |
687 | ||
688 | new_udriver->drvwrap.for_devices = 1; | |
689 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; | |
690 | new_udriver->drvwrap.driver.bus = &usb_bus_type; | |
691 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
692 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
693 | new_udriver->drvwrap.driver.owner = owner; | |
694 | ||
695 | retval = driver_register(&new_udriver->drvwrap.driver); | |
696 | ||
697 | if (!retval) { | |
698 | pr_info("%s: registered new device driver %s\n", | |
699 | usbcore_name, new_udriver->name); | |
700 | usbfs_update_special(); | |
701 | } else { | |
702 | printk(KERN_ERR "%s: error %d registering device " | |
703 | " driver %s\n", | |
704 | usbcore_name, retval, new_udriver->name); | |
705 | } | |
706 | ||
707 | return retval; | |
708 | } | |
709 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
710 | ||
711 | /** | |
712 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
713 | * @udriver: USB operations of the device driver to unregister | |
714 | * Context: must be able to sleep | |
715 | * | |
716 | * Unlinks the specified driver from the internal USB driver list. | |
717 | */ | |
718 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
719 | { | |
720 | pr_info("%s: deregistering device driver %s\n", | |
721 | usbcore_name, udriver->name); | |
722 | ||
723 | driver_unregister(&udriver->drvwrap.driver); | |
724 | usbfs_update_special(); | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
727 | ||
728 | /** | |
729 | * usb_register_driver - register a USB interface driver | |
730 | * @new_driver: USB operations for the interface driver | |
731 | * @owner: module owner of this driver. | |
892705a1 | 732 | * @mod_name: module name string |
8bb54ab5 AS |
733 | * |
734 | * Registers a USB interface driver with the USB core. The list of | |
735 | * unattached interfaces will be rescanned whenever a new driver is | |
736 | * added, allowing the new driver to attach to any recognized interfaces. | |
ddae41be GKH |
737 | * Returns a negative error code on failure and 0 on success. |
738 | * | |
739 | * NOTE: if you want your driver to use the USB major number, you must call | |
740 | * usb_register_dev() to enable that functionality. This function no longer | |
741 | * takes care of that. | |
742 | */ | |
80f745fb GKH |
743 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
744 | const char *mod_name) | |
ddae41be GKH |
745 | { |
746 | int retval = 0; | |
747 | ||
748 | if (usb_disabled()) | |
749 | return -ENODEV; | |
750 | ||
8bb54ab5 AS |
751 | new_driver->drvwrap.for_devices = 0; |
752 | new_driver->drvwrap.driver.name = (char *) new_driver->name; | |
753 | new_driver->drvwrap.driver.bus = &usb_bus_type; | |
754 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
755 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
756 | new_driver->drvwrap.driver.owner = owner; | |
80f745fb | 757 | new_driver->drvwrap.driver.mod_name = mod_name; |
733260ff GKH |
758 | spin_lock_init(&new_driver->dynids.lock); |
759 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 760 | |
8bb54ab5 | 761 | retval = driver_register(&new_driver->drvwrap.driver); |
ddae41be GKH |
762 | |
763 | if (!retval) { | |
8bb54ab5 | 764 | pr_info("%s: registered new interface driver %s\n", |
ddae41be GKH |
765 | usbcore_name, new_driver->name); |
766 | usbfs_update_special(); | |
733260ff | 767 | usb_create_newid_file(new_driver); |
ddae41be | 768 | } else { |
8bb54ab5 AS |
769 | printk(KERN_ERR "%s: error %d registering interface " |
770 | " driver %s\n", | |
ddae41be GKH |
771 | usbcore_name, retval, new_driver->name); |
772 | } | |
773 | ||
774 | return retval; | |
775 | } | |
b87ba0a3 | 776 | EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver); |
ddae41be GKH |
777 | |
778 | /** | |
8bb54ab5 AS |
779 | * usb_deregister - unregister a USB interface driver |
780 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
781 | * Context: must be able to sleep |
782 | * | |
783 | * Unlinks the specified driver from the internal USB driver list. | |
784 | * | |
785 | * NOTE: If you called usb_register_dev(), you still need to call | |
786 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
787 | * this * call will no longer do it for you. | |
788 | */ | |
789 | void usb_deregister(struct usb_driver *driver) | |
790 | { | |
8bb54ab5 AS |
791 | pr_info("%s: deregistering interface driver %s\n", |
792 | usbcore_name, driver->name); | |
ddae41be | 793 | |
ba9dc657 | 794 | usb_remove_newid_file(driver); |
733260ff | 795 | usb_free_dynids(driver); |
8bb54ab5 | 796 | driver_unregister(&driver->drvwrap.driver); |
ddae41be GKH |
797 | |
798 | usbfs_update_special(); | |
799 | } | |
b87ba0a3 | 800 | EXPORT_SYMBOL_GPL_FUTURE(usb_deregister); |
36e56a34 AS |
801 | |
802 | #ifdef CONFIG_PM | |
803 | ||
e0318ebf | 804 | /* Caller has locked udev's pm_mutex */ |
d5ec1686 | 805 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
36e56a34 | 806 | { |
782da727 | 807 | struct usb_device_driver *udriver; |
2bf4086d | 808 | int status = 0; |
36e56a34 | 809 | |
114b368c AS |
810 | if (udev->state == USB_STATE_NOTATTACHED || |
811 | udev->state == USB_STATE_SUSPENDED) | |
812 | goto done; | |
813 | ||
b6f6436d AS |
814 | /* For devices that don't have a driver, we do a generic suspend. */ |
815 | if (udev->dev.driver) | |
816 | udriver = to_usb_device_driver(udev->dev.driver); | |
817 | else { | |
645daaab | 818 | udev->do_remote_wakeup = 0; |
b6f6436d | 819 | udriver = &usb_generic_driver; |
1c5df7e7 | 820 | } |
2bf4086d AS |
821 | status = udriver->suspend(udev, msg); |
822 | ||
20dfdad7 AS |
823 | done: |
824 | dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); | |
2bf4086d AS |
825 | if (status == 0) |
826 | udev->dev.power.power_state.event = msg.event; | |
827 | return status; | |
1cc8a25d AS |
828 | } |
829 | ||
e0318ebf | 830 | /* Caller has locked udev's pm_mutex */ |
d5ec1686 | 831 | static int usb_resume_device(struct usb_device *udev) |
1cc8a25d AS |
832 | { |
833 | struct usb_device_driver *udriver; | |
2bf4086d | 834 | int status = 0; |
36e56a34 | 835 | |
0458d5b4 AS |
836 | if (udev->state == USB_STATE_NOTATTACHED) |
837 | goto done; | |
838 | if (udev->state != USB_STATE_SUSPENDED && !udev->reset_resume) | |
2bf4086d | 839 | goto done; |
1cc8a25d | 840 | |
1c5df7e7 AS |
841 | /* Can't resume it if it doesn't have a driver. */ |
842 | if (udev->dev.driver == NULL) { | |
843 | status = -ENOTCONN; | |
2bf4086d | 844 | goto done; |
1c5df7e7 AS |
845 | } |
846 | ||
6bc6cff5 AS |
847 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
848 | udev->reset_resume = 1; | |
849 | ||
1cc8a25d | 850 | udriver = to_usb_device_driver(udev->dev.driver); |
2bf4086d AS |
851 | status = udriver->resume(udev); |
852 | ||
20dfdad7 AS |
853 | done: |
854 | dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); | |
2add5229 AS |
855 | if (status == 0) { |
856 | udev->autoresume_disabled = 0; | |
2bf4086d | 857 | udev->dev.power.power_state.event = PM_EVENT_ON; |
2add5229 | 858 | } |
2bf4086d | 859 | return status; |
1cc8a25d AS |
860 | } |
861 | ||
e0318ebf | 862 | /* Caller has locked intf's usb_device's pm mutex */ |
d5ec1686 | 863 | static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg) |
1cc8a25d AS |
864 | { |
865 | struct usb_driver *driver; | |
2bf4086d | 866 | int status = 0; |
1cc8a25d | 867 | |
114b368c AS |
868 | /* with no hardware, USB interfaces only use FREEZE and ON states */ |
869 | if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED || | |
870 | !is_active(intf)) | |
2bf4086d | 871 | goto done; |
1cc8a25d | 872 | |
645daaab | 873 | if (intf->condition == USB_INTERFACE_UNBOUND) /* This can't happen */ |
2bf4086d | 874 | goto done; |
114b368c | 875 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 AS |
876 | |
877 | if (driver->suspend && driver->resume) { | |
1cc8a25d | 878 | status = driver->suspend(intf, msg); |
645daaab AS |
879 | if (status == 0) |
880 | mark_quiesced(intf); | |
881 | else if (!interface_to_usbdev(intf)->auto_pm) | |
1cc8a25d AS |
882 | dev_err(&intf->dev, "%s error %d\n", |
883 | "suspend", status); | |
36e56a34 AS |
884 | } else { |
885 | // FIXME else if there's no suspend method, disconnect... | |
645daaab | 886 | // Not possible if auto_pm is set... |
1cc8a25d AS |
887 | dev_warn(&intf->dev, "no suspend for driver %s?\n", |
888 | driver->name); | |
36e56a34 | 889 | mark_quiesced(intf); |
36e56a34 | 890 | } |
2bf4086d | 891 | |
20dfdad7 AS |
892 | done: |
893 | dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); | |
36e56a34 AS |
894 | return status; |
895 | } | |
896 | ||
645daaab | 897 | /* Caller has locked intf's usb_device's pm_mutex */ |
0458d5b4 | 898 | static int usb_resume_interface(struct usb_interface *intf, int reset_resume) |
36e56a34 | 899 | { |
1cc8a25d | 900 | struct usb_driver *driver; |
2bf4086d | 901 | int status = 0; |
36e56a34 | 902 | |
114b368c AS |
903 | if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED || |
904 | is_active(intf)) | |
2bf4086d | 905 | goto done; |
36e56a34 | 906 | |
645daaab AS |
907 | /* Don't let autoresume interfere with unbinding */ |
908 | if (intf->condition == USB_INTERFACE_UNBINDING) | |
909 | goto done; | |
910 | ||
1c5df7e7 | 911 | /* Can't resume it if it doesn't have a driver. */ |
645daaab | 912 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
1c5df7e7 | 913 | status = -ENOTCONN; |
2bf4086d | 914 | goto done; |
1c5df7e7 | 915 | } |
1cc8a25d | 916 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 917 | |
0458d5b4 AS |
918 | if (reset_resume && driver->post_reset) |
919 | driver->post_reset(intf, reset_resume); | |
920 | else if (driver->resume) { | |
36e56a34 | 921 | status = driver->resume(intf); |
2bf4086d | 922 | if (status) |
1cc8a25d AS |
923 | dev_err(&intf->dev, "%s error %d\n", |
924 | "resume", status); | |
0458d5b4 | 925 | } else |
1cc8a25d AS |
926 | dev_warn(&intf->dev, "no resume for driver %s?\n", |
927 | driver->name); | |
2bf4086d AS |
928 | |
929 | done: | |
20dfdad7 | 930 | dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); |
0458d5b4 AS |
931 | if (status == 0) |
932 | mark_active(intf); | |
2bf4086d | 933 | return status; |
36e56a34 AS |
934 | } |
935 | ||
94fcda1f AS |
936 | #ifdef CONFIG_USB_SUSPEND |
937 | ||
af4f7606 AS |
938 | /* Internal routine to check whether we may autosuspend a device. */ |
939 | static int autosuspend_check(struct usb_device *udev) | |
940 | { | |
941 | int i; | |
942 | struct usb_interface *intf; | |
8c9862e5 | 943 | unsigned long suspend_time; |
af4f7606 | 944 | |
b5e795f8 AS |
945 | /* For autosuspend, fail fast if anything is in use or autosuspend |
946 | * is disabled. Also fail if any interfaces require remote wakeup | |
947 | * but it isn't available. | |
948 | */ | |
af4f7606 AS |
949 | udev->do_remote_wakeup = device_may_wakeup(&udev->dev); |
950 | if (udev->pm_usage_cnt > 0) | |
951 | return -EBUSY; | |
2add5229 | 952 | if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled) |
b5e795f8 AS |
953 | return -EPERM; |
954 | ||
1941044a | 955 | suspend_time = udev->last_busy + udev->autosuspend_delay; |
af4f7606 AS |
956 | if (udev->actconfig) { |
957 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
958 | intf = udev->actconfig->interface[i]; | |
959 | if (!is_active(intf)) | |
960 | continue; | |
961 | if (intf->pm_usage_cnt > 0) | |
962 | return -EBUSY; | |
963 | if (intf->needs_remote_wakeup && | |
964 | !udev->do_remote_wakeup) { | |
965 | dev_dbg(&udev->dev, "remote wakeup needed " | |
966 | "for autosuspend\n"); | |
967 | return -EOPNOTSUPP; | |
968 | } | |
969 | } | |
970 | } | |
1941044a AS |
971 | |
972 | /* If everything is okay but the device hasn't been idle for long | |
973 | * enough, queue a delayed autosuspend request. | |
974 | */ | |
8c9862e5 AS |
975 | if (time_after(suspend_time, jiffies)) { |
976 | if (!timer_pending(&udev->autosuspend.timer)) { | |
977 | ||
978 | /* The value of jiffies may change between the | |
979 | * time_after() comparison above and the subtraction | |
980 | * below. That's okay; the system behaves sanely | |
981 | * when a timer is registered for the present moment | |
982 | * or for the past. | |
983 | */ | |
1941044a | 984 | queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, |
8c9862e5 AS |
985 | suspend_time - jiffies); |
986 | } | |
1941044a AS |
987 | return -EAGAIN; |
988 | } | |
af4f7606 AS |
989 | return 0; |
990 | } | |
991 | ||
94fcda1f AS |
992 | #else |
993 | ||
ef7f6c70 AS |
994 | static inline int autosuspend_check(struct usb_device *udev) |
995 | { | |
996 | return 0; | |
997 | } | |
94fcda1f | 998 | |
b5e795f8 | 999 | #endif /* CONFIG_USB_SUSPEND */ |
94fcda1f | 1000 | |
645daaab AS |
1001 | /** |
1002 | * usb_suspend_both - suspend a USB device and its interfaces | |
1003 | * @udev: the usb_device to suspend | |
1004 | * @msg: Power Management message describing this state transition | |
1005 | * | |
1006 | * This is the central routine for suspending USB devices. It calls the | |
1007 | * suspend methods for all the interface drivers in @udev and then calls | |
1008 | * the suspend method for @udev itself. If an error occurs at any stage, | |
1009 | * all the interfaces which were suspended are resumed so that they remain | |
1010 | * in the same state as the device. | |
1011 | * | |
1012 | * If an autosuspend is in progress (@udev->auto_pm is set), the routine | |
1013 | * checks first to make sure that neither the device itself or any of its | |
1014 | * active interfaces is in use (pm_usage_cnt is greater than 0). If they | |
1015 | * are, the autosuspend fails. | |
1016 | * | |
1017 | * If the suspend succeeds, the routine recursively queues an autosuspend | |
1018 | * request for @udev's parent device, thereby propagating the change up | |
1019 | * the device tree. If all of the parent's children are now suspended, | |
1020 | * the parent will autosuspend in turn. | |
1021 | * | |
1022 | * The suspend method calls are subject to mutual exclusion under control | |
1023 | * of @udev's pm_mutex. Many of these calls are also under the protection | |
1024 | * of @udev's device lock (including all requests originating outside the | |
1025 | * USB subsystem), but autosuspend requests generated by a child device or | |
1026 | * interface driver may not be. Usbcore will insure that the method calls | |
1027 | * do not arrive during bind, unbind, or reset operations. However, drivers | |
1028 | * must be prepared to handle suspend calls arriving at unpredictable times. | |
1029 | * The only way to block such calls is to do an autoresume (preventing | |
1030 | * autosuspends) while holding @udev's device lock (preventing outside | |
1031 | * suspends). | |
1032 | * | |
1033 | * The caller must hold @udev->pm_mutex. | |
1034 | * | |
1035 | * This routine can run only in process context. | |
1036 | */ | |
718efa64 | 1037 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 AS |
1038 | { |
1039 | int status = 0; | |
1040 | int i = 0; | |
1041 | struct usb_interface *intf; | |
645daaab AS |
1042 | struct usb_device *parent = udev->parent; |
1043 | ||
1941044a AS |
1044 | if (udev->state == USB_STATE_NOTATTACHED || |
1045 | udev->state == USB_STATE_SUSPENDED) | |
1046 | goto done; | |
a8e7c565 | 1047 | |
645daaab AS |
1048 | udev->do_remote_wakeup = device_may_wakeup(&udev->dev); |
1049 | ||
645daaab | 1050 | if (udev->auto_pm) { |
af4f7606 AS |
1051 | status = autosuspend_check(udev); |
1052 | if (status < 0) | |
1941044a | 1053 | goto done; |
645daaab AS |
1054 | } |
1055 | ||
1056 | /* Suspend all the interfaces and then udev itself */ | |
a8e7c565 AS |
1057 | if (udev->actconfig) { |
1058 | for (; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1059 | intf = udev->actconfig->interface[i]; | |
d5ec1686 | 1060 | status = usb_suspend_interface(intf, msg); |
a8e7c565 AS |
1061 | if (status != 0) |
1062 | break; | |
1063 | } | |
1064 | } | |
4d461095 AS |
1065 | if (status == 0) { |
1066 | ||
1067 | /* Non-root devices don't need to do anything for FREEZE | |
1068 | * or PRETHAW. */ | |
1069 | if (udev->parent && (msg.event == PM_EVENT_FREEZE || | |
1070 | msg.event == PM_EVENT_PRETHAW)) | |
1071 | goto done; | |
d5ec1686 | 1072 | status = usb_suspend_device(udev, msg); |
4d461095 | 1073 | } |
a8e7c565 AS |
1074 | |
1075 | /* If the suspend failed, resume interfaces that did get suspended */ | |
1076 | if (status != 0) { | |
1077 | while (--i >= 0) { | |
1078 | intf = udev->actconfig->interface[i]; | |
0458d5b4 | 1079 | usb_resume_interface(intf, 0); |
a8e7c565 | 1080 | } |
645daaab | 1081 | |
ef7f6c70 AS |
1082 | /* Try another autosuspend when the interfaces aren't busy */ |
1083 | if (udev->auto_pm) | |
1084 | autosuspend_check(udev); | |
1085 | ||
645daaab | 1086 | /* If the suspend succeeded, propagate it up the tree */ |
ef7f6c70 AS |
1087 | } else { |
1088 | cancel_delayed_work(&udev->autosuspend); | |
1089 | if (parent) | |
1090 | usb_autosuspend_device(parent); | |
1091 | } | |
645daaab | 1092 | |
1941044a | 1093 | done: |
20dfdad7 | 1094 | dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); |
a8e7c565 AS |
1095 | return status; |
1096 | } | |
1097 | ||
645daaab AS |
1098 | /** |
1099 | * usb_resume_both - resume a USB device and its interfaces | |
1100 | * @udev: the usb_device to resume | |
1101 | * | |
1102 | * This is the central routine for resuming USB devices. It calls the | |
1103 | * the resume method for @udev and then calls the resume methods for all | |
1104 | * the interface drivers in @udev. | |
1105 | * | |
1106 | * Before starting the resume, the routine calls itself recursively for | |
1107 | * the parent device of @udev, thereby propagating the change up the device | |
1108 | * tree and assuring that @udev will be able to resume. If the parent is | |
1109 | * unable to resume successfully, the routine fails. | |
1110 | * | |
1111 | * The resume method calls are subject to mutual exclusion under control | |
1112 | * of @udev's pm_mutex. Many of these calls are also under the protection | |
1113 | * of @udev's device lock (including all requests originating outside the | |
1114 | * USB subsystem), but autoresume requests generated by a child device or | |
1115 | * interface driver may not be. Usbcore will insure that the method calls | |
1116 | * do not arrive during bind, unbind, or reset operations. However, drivers | |
1117 | * must be prepared to handle resume calls arriving at unpredictable times. | |
1118 | * The only way to block such calls is to do an autoresume (preventing | |
1119 | * other autoresumes) while holding @udev's device lock (preventing outside | |
1120 | * resumes). | |
1121 | * | |
1122 | * The caller must hold @udev->pm_mutex. | |
1123 | * | |
1124 | * This routine can run only in process context. | |
1125 | */ | |
718efa64 | 1126 | static int usb_resume_both(struct usb_device *udev) |
a8e7c565 | 1127 | { |
645daaab | 1128 | int status = 0; |
a8e7c565 AS |
1129 | int i; |
1130 | struct usb_interface *intf; | |
645daaab AS |
1131 | struct usb_device *parent = udev->parent; |
1132 | ||
1133 | cancel_delayed_work(&udev->autosuspend); | |
1941044a AS |
1134 | if (udev->state == USB_STATE_NOTATTACHED) { |
1135 | status = -ENODEV; | |
1136 | goto done; | |
1137 | } | |
a8e7c565 | 1138 | |
645daaab AS |
1139 | /* Propagate the resume up the tree, if necessary */ |
1140 | if (udev->state == USB_STATE_SUSPENDED) { | |
1941044a AS |
1141 | if (udev->auto_pm && udev->autoresume_disabled) { |
1142 | status = -EPERM; | |
1143 | goto done; | |
1144 | } | |
645daaab | 1145 | if (parent) { |
94fcda1f | 1146 | status = usb_autoresume_device(parent); |
ee49fb5d AS |
1147 | if (status == 0) { |
1148 | status = usb_resume_device(udev); | |
1149 | if (status) { | |
94fcda1f | 1150 | usb_autosuspend_device(parent); |
ee49fb5d AS |
1151 | |
1152 | /* It's possible usb_resume_device() | |
1153 | * failed after the port was | |
1154 | * unsuspended, causing udev to be | |
1155 | * logically disconnected. We don't | |
1156 | * want usb_disconnect() to autosuspend | |
1157 | * the parent again, so tell it that | |
1158 | * udev disconnected while still | |
1159 | * suspended. */ | |
1160 | if (udev->state == | |
1161 | USB_STATE_NOTATTACHED) | |
1162 | udev->discon_suspended = 1; | |
1163 | } | |
1164 | } | |
645daaab AS |
1165 | } else { |
1166 | ||
1167 | /* We can't progagate beyond the USB subsystem, | |
1168 | * so if a root hub's controller is suspended | |
1169 | * then we're stuck. */ | |
1170 | if (udev->dev.parent->power.power_state.event != | |
1171 | PM_EVENT_ON) | |
1172 | status = -EHOSTUNREACH; | |
ee49fb5d AS |
1173 | else |
1174 | status = usb_resume_device(udev); | |
1175 | } | |
592fbbe4 AS |
1176 | } else { |
1177 | ||
0458d5b4 AS |
1178 | /* Needed for setting udev->dev.power.power_state.event, |
1179 | * for possible debugging message, and for reset_resume. */ | |
d5ec1686 | 1180 | status = usb_resume_device(udev); |
114b368c AS |
1181 | } |
1182 | ||
a8e7c565 AS |
1183 | if (status == 0 && udev->actconfig) { |
1184 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1185 | intf = udev->actconfig->interface[i]; | |
0458d5b4 | 1186 | usb_resume_interface(intf, udev->reset_resume); |
a8e7c565 AS |
1187 | } |
1188 | } | |
645daaab | 1189 | |
1941044a | 1190 | done: |
20dfdad7 | 1191 | dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); |
0458d5b4 | 1192 | udev->reset_resume = 0; |
645daaab AS |
1193 | return status; |
1194 | } | |
1195 | ||
1196 | #ifdef CONFIG_USB_SUSPEND | |
1197 | ||
94fcda1f AS |
1198 | /* Internal routine to adjust a device's usage counter and change |
1199 | * its autosuspend state. | |
1200 | */ | |
1201 | static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt) | |
1202 | { | |
1203 | int status = 0; | |
1204 | ||
1205 | usb_pm_lock(udev); | |
1941044a | 1206 | udev->auto_pm = 1; |
94fcda1f AS |
1207 | udev->pm_usage_cnt += inc_usage_cnt; |
1208 | WARN_ON(udev->pm_usage_cnt < 0); | |
1209 | if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) { | |
1941044a AS |
1210 | if (udev->state == USB_STATE_SUSPENDED) |
1211 | status = usb_resume_both(udev); | |
94fcda1f AS |
1212 | if (status != 0) |
1213 | udev->pm_usage_cnt -= inc_usage_cnt; | |
1941044a AS |
1214 | else if (inc_usage_cnt) |
1215 | udev->last_busy = jiffies; | |
1216 | } else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) { | |
1217 | if (inc_usage_cnt) | |
1218 | udev->last_busy = jiffies; | |
1219 | status = usb_suspend_both(udev, PMSG_SUSPEND); | |
1220 | } | |
94fcda1f AS |
1221 | usb_pm_unlock(udev); |
1222 | return status; | |
1223 | } | |
1224 | ||
1941044a AS |
1225 | /* usb_autosuspend_work - callback routine to autosuspend a USB device */ |
1226 | void usb_autosuspend_work(struct work_struct *work) | |
1227 | { | |
1228 | struct usb_device *udev = | |
1229 | container_of(work, struct usb_device, autosuspend.work); | |
1230 | ||
1231 | usb_autopm_do_device(udev, 0); | |
1232 | } | |
1233 | ||
645daaab AS |
1234 | /** |
1235 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces | |
701f35af | 1236 | * @udev: the usb_device to autosuspend |
645daaab AS |
1237 | * |
1238 | * This routine should be called when a core subsystem is finished using | |
1239 | * @udev and wants to allow it to autosuspend. Examples would be when | |
1240 | * @udev's device file in usbfs is closed or after a configuration change. | |
1241 | * | |
94fcda1f AS |
1242 | * @udev's usage counter is decremented. If it or any of the usage counters |
1243 | * for an active interface is greater than 0, no autosuspend request will be | |
1244 | * queued. (If an interface driver does not support autosuspend then its | |
1245 | * usage counter is permanently positive.) Furthermore, if an interface | |
1246 | * driver requires remote-wakeup capability during autosuspend but remote | |
1247 | * wakeup is disabled, the autosuspend will fail. | |
645daaab AS |
1248 | * |
1249 | * Often the caller will hold @udev's device lock, but this is not | |
1250 | * necessary. | |
1251 | * | |
1252 | * This routine can run only in process context. | |
1253 | */ | |
94fcda1f | 1254 | void usb_autosuspend_device(struct usb_device *udev) |
645daaab | 1255 | { |
94fcda1f AS |
1256 | int status; |
1257 | ||
1258 | status = usb_autopm_do_device(udev, -1); | |
20dfdad7 AS |
1259 | dev_vdbg(&udev->dev, "%s: cnt %d\n", |
1260 | __FUNCTION__, udev->pm_usage_cnt); | |
19c26239 AS |
1261 | } |
1262 | ||
1263 | /** | |
1264 | * usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces | |
1265 | * @udev: the usb_device to autosuspend | |
1266 | * | |
1267 | * This routine should be called when a core subsystem thinks @udev may | |
1268 | * be ready to autosuspend. | |
1269 | * | |
1270 | * @udev's usage counter left unchanged. If it or any of the usage counters | |
1271 | * for an active interface is greater than 0, or autosuspend is not allowed | |
1272 | * for any other reason, no autosuspend request will be queued. | |
1273 | * | |
1274 | * This routine can run only in process context. | |
1275 | */ | |
1276 | void usb_try_autosuspend_device(struct usb_device *udev) | |
1277 | { | |
1278 | usb_autopm_do_device(udev, 0); | |
20dfdad7 AS |
1279 | dev_vdbg(&udev->dev, "%s: cnt %d\n", |
1280 | __FUNCTION__, udev->pm_usage_cnt); | |
645daaab AS |
1281 | } |
1282 | ||
1283 | /** | |
1284 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces | |
701f35af | 1285 | * @udev: the usb_device to autoresume |
645daaab AS |
1286 | * |
1287 | * This routine should be called when a core subsystem wants to use @udev | |
94fcda1f AS |
1288 | * and needs to guarantee that it is not suspended. No autosuspend will |
1289 | * occur until usb_autosuspend_device is called. (Note that this will not | |
1290 | * prevent suspend events originating in the PM core.) Examples would be | |
1291 | * when @udev's device file in usbfs is opened or when a remote-wakeup | |
1292 | * request is received. | |
645daaab | 1293 | * |
94fcda1f AS |
1294 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
1295 | * However if the autoresume fails then the usage counter is re-decremented. | |
645daaab AS |
1296 | * |
1297 | * Often the caller will hold @udev's device lock, but this is not | |
1298 | * necessary (and attempting it might cause deadlock). | |
1299 | * | |
1300 | * This routine can run only in process context. | |
1301 | */ | |
94fcda1f | 1302 | int usb_autoresume_device(struct usb_device *udev) |
645daaab AS |
1303 | { |
1304 | int status; | |
1305 | ||
94fcda1f | 1306 | status = usb_autopm_do_device(udev, 1); |
20dfdad7 AS |
1307 | dev_vdbg(&udev->dev, "%s: status %d cnt %d\n", |
1308 | __FUNCTION__, status, udev->pm_usage_cnt); | |
645daaab AS |
1309 | return status; |
1310 | } | |
1311 | ||
af4f7606 AS |
1312 | /* Internal routine to adjust an interface's usage counter and change |
1313 | * its device's autosuspend state. | |
1314 | */ | |
1315 | static int usb_autopm_do_interface(struct usb_interface *intf, | |
1316 | int inc_usage_cnt) | |
1317 | { | |
1318 | struct usb_device *udev = interface_to_usbdev(intf); | |
1319 | int status = 0; | |
1320 | ||
1321 | usb_pm_lock(udev); | |
1322 | if (intf->condition == USB_INTERFACE_UNBOUND) | |
1323 | status = -ENODEV; | |
1324 | else { | |
1941044a | 1325 | udev->auto_pm = 1; |
af4f7606 AS |
1326 | intf->pm_usage_cnt += inc_usage_cnt; |
1327 | if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) { | |
1941044a AS |
1328 | if (udev->state == USB_STATE_SUSPENDED) |
1329 | status = usb_resume_both(udev); | |
af4f7606 AS |
1330 | if (status != 0) |
1331 | intf->pm_usage_cnt -= inc_usage_cnt; | |
1941044a AS |
1332 | else if (inc_usage_cnt) |
1333 | udev->last_busy = jiffies; | |
1334 | } else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) { | |
1335 | if (inc_usage_cnt) | |
1336 | udev->last_busy = jiffies; | |
1337 | status = usb_suspend_both(udev, PMSG_SUSPEND); | |
1338 | } | |
af4f7606 AS |
1339 | } |
1340 | usb_pm_unlock(udev); | |
1341 | return status; | |
1342 | } | |
1343 | ||
645daaab AS |
1344 | /** |
1345 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter | |
701f35af | 1346 | * @intf: the usb_interface whose counter should be decremented |
645daaab AS |
1347 | * |
1348 | * This routine should be called by an interface driver when it is | |
1349 | * finished using @intf and wants to allow it to autosuspend. A typical | |
1350 | * example would be a character-device driver when its device file is | |
1351 | * closed. | |
1352 | * | |
1353 | * The routine decrements @intf's usage counter. When the counter reaches | |
1354 | * 0, a delayed autosuspend request for @intf's device is queued. When | |
1355 | * the delay expires, if @intf->pm_usage_cnt is still <= 0 along with all | |
1356 | * the other usage counters for the sibling interfaces and @intf's | |
1357 | * usb_device, the device and all its interfaces will be autosuspended. | |
1358 | * | |
1359 | * Note that @intf->pm_usage_cnt is owned by the interface driver. The | |
1360 | * core will not change its value other than the increment and decrement | |
1361 | * in usb_autopm_get_interface and usb_autopm_put_interface. The driver | |
1362 | * may use this simple counter-oriented discipline or may set the value | |
1363 | * any way it likes. | |
1364 | * | |
1365 | * If the driver has set @intf->needs_remote_wakeup then autosuspend will | |
1366 | * take place only if the device's remote-wakeup facility is enabled. | |
1367 | * | |
1368 | * Suspend method calls queued by this routine can arrive at any time | |
1369 | * while @intf is resumed and its usage counter is equal to 0. They are | |
1370 | * not protected by the usb_device's lock but only by its pm_mutex. | |
1371 | * Drivers must provide their own synchronization. | |
1372 | * | |
1373 | * This routine can run only in process context. | |
1374 | */ | |
1375 | void usb_autopm_put_interface(struct usb_interface *intf) | |
1376 | { | |
af4f7606 | 1377 | int status; |
645daaab | 1378 | |
af4f7606 | 1379 | status = usb_autopm_do_interface(intf, -1); |
20dfdad7 AS |
1380 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
1381 | __FUNCTION__, status, intf->pm_usage_cnt); | |
645daaab AS |
1382 | } |
1383 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); | |
1384 | ||
1385 | /** | |
1386 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter | |
701f35af | 1387 | * @intf: the usb_interface whose counter should be incremented |
645daaab AS |
1388 | * |
1389 | * This routine should be called by an interface driver when it wants to | |
1390 | * use @intf and needs to guarantee that it is not suspended. In addition, | |
1391 | * the routine prevents @intf from being autosuspended subsequently. (Note | |
1392 | * that this will not prevent suspend events originating in the PM core.) | |
1393 | * This prevention will persist until usb_autopm_put_interface() is called | |
1394 | * or @intf is unbound. A typical example would be a character-device | |
1395 | * driver when its device file is opened. | |
1396 | * | |
1941044a AS |
1397 | * |
1398 | * The routine increments @intf's usage counter. (However if the | |
1399 | * autoresume fails then the counter is re-decremented.) So long as the | |
1400 | * counter is greater than 0, autosuspend will not be allowed for @intf | |
1401 | * or its usb_device. When the driver is finished using @intf it should | |
1402 | * call usb_autopm_put_interface() to decrement the usage counter and | |
1403 | * queue a delayed autosuspend request (if the counter is <= 0). | |
1404 | * | |
645daaab AS |
1405 | * |
1406 | * Note that @intf->pm_usage_cnt is owned by the interface driver. The | |
1407 | * core will not change its value other than the increment and decrement | |
1408 | * in usb_autopm_get_interface and usb_autopm_put_interface. The driver | |
1409 | * may use this simple counter-oriented discipline or may set the value | |
1410 | * any way it likes. | |
1411 | * | |
1412 | * Resume method calls generated by this routine can arrive at any time | |
1413 | * while @intf is suspended. They are not protected by the usb_device's | |
1414 | * lock but only by its pm_mutex. Drivers must provide their own | |
1415 | * synchronization. | |
1416 | * | |
1417 | * This routine can run only in process context. | |
1418 | */ | |
1419 | int usb_autopm_get_interface(struct usb_interface *intf) | |
1420 | { | |
af4f7606 | 1421 | int status; |
645daaab | 1422 | |
af4f7606 | 1423 | status = usb_autopm_do_interface(intf, 1); |
20dfdad7 AS |
1424 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
1425 | __FUNCTION__, status, intf->pm_usage_cnt); | |
a8e7c565 AS |
1426 | return status; |
1427 | } | |
645daaab AS |
1428 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
1429 | ||
692a186c AS |
1430 | /** |
1431 | * usb_autopm_set_interface - set a USB interface's autosuspend state | |
1432 | * @intf: the usb_interface whose state should be set | |
1433 | * | |
1434 | * This routine sets the autosuspend state of @intf's device according | |
1435 | * to @intf's usage counter, which the caller must have set previously. | |
1436 | * If the counter is <= 0, the device is autosuspended (if it isn't | |
1437 | * already suspended and if nothing else prevents the autosuspend). If | |
1438 | * the counter is > 0, the device is autoresumed (if it isn't already | |
1439 | * awake). | |
1440 | */ | |
1441 | int usb_autopm_set_interface(struct usb_interface *intf) | |
1442 | { | |
1443 | int status; | |
1444 | ||
1445 | status = usb_autopm_do_interface(intf, 0); | |
20dfdad7 AS |
1446 | dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", |
1447 | __FUNCTION__, status, intf->pm_usage_cnt); | |
692a186c AS |
1448 | return status; |
1449 | } | |
1450 | EXPORT_SYMBOL_GPL(usb_autopm_set_interface); | |
1451 | ||
718efa64 AS |
1452 | #else |
1453 | ||
1454 | void usb_autosuspend_work(struct work_struct *work) | |
1455 | {} | |
1456 | ||
645daaab | 1457 | #endif /* CONFIG_USB_SUSPEND */ |
a8e7c565 | 1458 | |
6b157c9b AS |
1459 | /** |
1460 | * usb_external_suspend_device - external suspend of a USB device and its interfaces | |
1461 | * @udev: the usb_device to suspend | |
1462 | * @msg: Power Management message describing this state transition | |
1463 | * | |
1464 | * This routine handles external suspend requests: ones not generated | |
1465 | * internally by a USB driver (autosuspend) but rather coming from the user | |
1466 | * (via sysfs) or the PM core (system sleep). The suspend will be carried | |
1467 | * out regardless of @udev's usage counter or those of its interfaces, | |
1468 | * and regardless of whether or not remote wakeup is enabled. Of course, | |
1469 | * interface drivers still have the option of failing the suspend (if | |
1470 | * there are unsuspended children, for example). | |
1471 | * | |
1472 | * The caller must hold @udev's device lock. | |
1473 | */ | |
1474 | int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg) | |
1cc8a25d AS |
1475 | { |
1476 | int status; | |
1477 | ||
6b157c9b AS |
1478 | usb_pm_lock(udev); |
1479 | udev->auto_pm = 0; | |
1480 | status = usb_suspend_both(udev, msg); | |
1481 | usb_pm_unlock(udev); | |
1cc8a25d AS |
1482 | return status; |
1483 | } | |
1484 | ||
6b157c9b AS |
1485 | /** |
1486 | * usb_external_resume_device - external resume of a USB device and its interfaces | |
1487 | * @udev: the usb_device to resume | |
1488 | * | |
1489 | * This routine handles external resume requests: ones not generated | |
1490 | * internally by a USB driver (autoresume) but rather coming from the user | |
1491 | * (via sysfs), the PM core (system resume), or the device itself (remote | |
1492 | * wakeup). @udev's usage counter is unaffected. | |
1493 | * | |
1494 | * The caller must hold @udev's device lock. | |
1495 | */ | |
1496 | int usb_external_resume_device(struct usb_device *udev) | |
1cc8a25d AS |
1497 | { |
1498 | int status; | |
1499 | ||
6b157c9b AS |
1500 | usb_pm_lock(udev); |
1501 | udev->auto_pm = 0; | |
1502 | status = usb_resume_both(udev); | |
ef7f6c70 | 1503 | udev->last_busy = jiffies; |
6b157c9b | 1504 | usb_pm_unlock(udev); |
a8e7c565 | 1505 | |
6b157c9b AS |
1506 | /* Now that the device is awake, we can start trying to autosuspend |
1507 | * it again. */ | |
1508 | if (status == 0) | |
1509 | usb_try_autosuspend_device(udev); | |
1cc8a25d AS |
1510 | return status; |
1511 | } | |
1512 | ||
6b157c9b AS |
1513 | static int usb_suspend(struct device *dev, pm_message_t message) |
1514 | { | |
1515 | if (!is_usb_device(dev)) /* Ignore PM for interfaces */ | |
1516 | return 0; | |
1517 | return usb_external_suspend_device(to_usb_device(dev), message); | |
1518 | } | |
1519 | ||
1520 | static int usb_resume(struct device *dev) | |
1521 | { | |
2add5229 AS |
1522 | struct usb_device *udev; |
1523 | ||
6b157c9b AS |
1524 | if (!is_usb_device(dev)) /* Ignore PM for interfaces */ |
1525 | return 0; | |
2add5229 | 1526 | udev = to_usb_device(dev); |
0458d5b4 AS |
1527 | |
1528 | /* If autoresume is disabled then we also want to prevent resume | |
1529 | * during system wakeup. However, a "persistent-device" reset-resume | |
1530 | * after power loss counts as a wakeup event. So allow a | |
1531 | * reset-resume to occur if remote wakeup is enabled. */ | |
1532 | if (udev->autoresume_disabled) { | |
1533 | if (!(udev->reset_resume && udev->do_remote_wakeup)) | |
1534 | return -EPERM; | |
1535 | } | |
2add5229 | 1536 | return usb_external_resume_device(udev); |
6b157c9b AS |
1537 | } |
1538 | ||
1539 | #else | |
1540 | ||
1541 | #define usb_suspend NULL | |
1542 | #define usb_resume NULL | |
1543 | ||
36e56a34 AS |
1544 | #endif /* CONFIG_PM */ |
1545 | ||
1546 | struct bus_type usb_bus_type = { | |
1547 | .name = "usb", | |
1548 | .match = usb_device_match, | |
1549 | .uevent = usb_uevent, | |
782da727 AS |
1550 | .suspend = usb_suspend, |
1551 | .resume = usb_resume, | |
36e56a34 | 1552 | }; |