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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 | 25 | #include <linux/device.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
f940fcd8 | 27 | #include <linux/export.h> |
ddae41be | 28 | #include <linux/usb.h> |
6bc6cff5 | 29 | #include <linux/usb/quirks.h> |
27729aad | 30 | #include <linux/usb/hcd.h> |
27729aad | 31 | |
ddae41be GKH |
32 | #include "usb.h" |
33 | ||
20dfdad7 | 34 | |
733260ff GKH |
35 | #ifdef CONFIG_HOTPLUG |
36 | ||
37 | /* | |
38 | * Adds a new dynamic USBdevice ID to this driver, | |
39 | * and cause the driver to probe for all devices again. | |
40 | */ | |
93bacefc GKH |
41 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
42 | struct device_driver *driver, | |
43 | const char *buf, size_t count) | |
733260ff | 44 | { |
733260ff GKH |
45 | struct usb_dynid *dynid; |
46 | u32 idVendor = 0; | |
47 | u32 idProduct = 0; | |
ff231db8 | 48 | unsigned int bInterfaceClass = 0; |
733260ff | 49 | int fields = 0; |
1b21d5e1 | 50 | int retval = 0; |
733260ff | 51 | |
ff231db8 JD |
52 | fields = sscanf(buf, "%x %x %x", &idVendor, &idProduct, |
53 | &bInterfaceClass); | |
733260ff GKH |
54 | if (fields < 2) |
55 | return -EINVAL; | |
56 | ||
57 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
58 | if (!dynid) | |
59 | return -ENOMEM; | |
60 | ||
61 | INIT_LIST_HEAD(&dynid->node); | |
62 | dynid->id.idVendor = idVendor; | |
63 | dynid->id.idProduct = idProduct; | |
64 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; | |
ff231db8 JD |
65 | if (fields == 3) { |
66 | dynid->id.bInterfaceClass = (u8)bInterfaceClass; | |
67 | dynid->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS; | |
68 | } | |
733260ff | 69 | |
93bacefc | 70 | spin_lock(&dynids->lock); |
e5dd0115 | 71 | list_add_tail(&dynid->node, &dynids->list); |
93bacefc | 72 | spin_unlock(&dynids->lock); |
733260ff GKH |
73 | |
74 | if (get_driver(driver)) { | |
1b21d5e1 | 75 | retval = driver_attach(driver); |
733260ff GKH |
76 | put_driver(driver); |
77 | } | |
78 | ||
1b21d5e1 GKH |
79 | if (retval) |
80 | return retval; | |
733260ff GKH |
81 | return count; |
82 | } | |
93bacefc GKH |
83 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
84 | ||
85 | static ssize_t store_new_id(struct device_driver *driver, | |
86 | const char *buf, size_t count) | |
87 | { | |
88 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
89 | ||
90 | return usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
91 | } | |
733260ff GKH |
92 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
93 | ||
0c7a2b72 CR |
94 | /** |
95 | * store_remove_id - remove a USB device ID from this driver | |
96 | * @driver: target device driver | |
97 | * @buf: buffer for scanning device ID data | |
98 | * @count: input size | |
99 | * | |
100 | * Removes a dynamic usb device ID from this driver. | |
101 | */ | |
102 | static ssize_t | |
103 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) | |
104 | { | |
105 | struct usb_dynid *dynid, *n; | |
106 | struct usb_driver *usb_driver = to_usb_driver(driver); | |
107 | u32 idVendor = 0; | |
108 | u32 idProduct = 0; | |
109 | int fields = 0; | |
110 | int retval = 0; | |
111 | ||
112 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
113 | if (fields < 2) | |
114 | return -EINVAL; | |
115 | ||
116 | spin_lock(&usb_driver->dynids.lock); | |
117 | list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { | |
118 | struct usb_device_id *id = &dynid->id; | |
119 | if ((id->idVendor == idVendor) && | |
120 | (id->idProduct == idProduct)) { | |
121 | list_del(&dynid->node); | |
122 | kfree(dynid); | |
123 | retval = 0; | |
124 | break; | |
125 | } | |
126 | } | |
127 | spin_unlock(&usb_driver->dynids.lock); | |
128 | ||
129 | if (retval) | |
130 | return retval; | |
131 | return count; | |
132 | } | |
133 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); | |
134 | ||
733260ff GKH |
135 | static int usb_create_newid_file(struct usb_driver *usb_drv) |
136 | { | |
137 | int error = 0; | |
138 | ||
ba9dc657 GKH |
139 | if (usb_drv->no_dynamic_id) |
140 | goto exit; | |
141 | ||
733260ff | 142 | if (usb_drv->probe != NULL) |
15147ffd GKH |
143 | error = driver_create_file(&usb_drv->drvwrap.driver, |
144 | &driver_attr_new_id); | |
ba9dc657 | 145 | exit: |
733260ff GKH |
146 | return error; |
147 | } | |
148 | ||
ba9dc657 GKH |
149 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
150 | { | |
151 | if (usb_drv->no_dynamic_id) | |
152 | return; | |
153 | ||
154 | if (usb_drv->probe != NULL) | |
15147ffd GKH |
155 | driver_remove_file(&usb_drv->drvwrap.driver, |
156 | &driver_attr_new_id); | |
ba9dc657 GKH |
157 | } |
158 | ||
0c7a2b72 CR |
159 | static int |
160 | usb_create_removeid_file(struct usb_driver *drv) | |
161 | { | |
162 | int error = 0; | |
163 | if (drv->probe != NULL) | |
164 | error = driver_create_file(&drv->drvwrap.driver, | |
165 | &driver_attr_remove_id); | |
166 | return error; | |
167 | } | |
168 | ||
169 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
170 | { | |
171 | driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id); | |
172 | } | |
173 | ||
733260ff GKH |
174 | static void usb_free_dynids(struct usb_driver *usb_drv) |
175 | { | |
176 | struct usb_dynid *dynid, *n; | |
177 | ||
178 | spin_lock(&usb_drv->dynids.lock); | |
179 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
180 | list_del(&dynid->node); | |
181 | kfree(dynid); | |
182 | } | |
183 | spin_unlock(&usb_drv->dynids.lock); | |
184 | } | |
185 | #else | |
186 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) | |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
ba9dc657 GKH |
191 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
192 | { | |
193 | } | |
194 | ||
0c7a2b72 CR |
195 | static int |
196 | usb_create_removeid_file(struct usb_driver *drv) | |
197 | { | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
202 | { | |
203 | } | |
204 | ||
733260ff GKH |
205 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
206 | { | |
207 | } | |
208 | #endif | |
209 | ||
210 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
211 | struct usb_driver *drv) | |
212 | { | |
213 | struct usb_dynid *dynid; | |
214 | ||
215 | spin_lock(&drv->dynids.lock); | |
216 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
217 | if (usb_match_one_id(intf, &dynid->id)) { | |
218 | spin_unlock(&drv->dynids.lock); | |
219 | return &dynid->id; | |
220 | } | |
221 | } | |
222 | spin_unlock(&drv->dynids.lock); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | ||
8bb54ab5 AS |
227 | /* called from driver core with dev locked */ |
228 | static int usb_probe_device(struct device *dev) | |
229 | { | |
230 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
55129666 | 231 | struct usb_device *udev = to_usb_device(dev); |
9bbdf1e0 | 232 | int error = 0; |
8bb54ab5 | 233 | |
441b62c1 | 234 | dev_dbg(dev, "%s\n", __func__); |
8bb54ab5 | 235 | |
8bb54ab5 AS |
236 | /* TODO: Add real matching code */ |
237 | ||
645daaab AS |
238 | /* The device should always appear to be in use |
239 | * unless the driver suports autosuspend. | |
240 | */ | |
9bbdf1e0 AS |
241 | if (!udriver->supports_autosuspend) |
242 | error = usb_autoresume_device(udev); | |
645daaab | 243 | |
9bbdf1e0 AS |
244 | if (!error) |
245 | error = udriver->probe(udev); | |
8bb54ab5 AS |
246 | return error; |
247 | } | |
248 | ||
249 | /* called from driver core with dev locked */ | |
250 | static int usb_unbind_device(struct device *dev) | |
251 | { | |
9bbdf1e0 | 252 | struct usb_device *udev = to_usb_device(dev); |
8bb54ab5 AS |
253 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
254 | ||
9bbdf1e0 AS |
255 | udriver->disconnect(udev); |
256 | if (!udriver->supports_autosuspend) | |
257 | usb_autosuspend_device(udev); | |
8bb54ab5 AS |
258 | return 0; |
259 | } | |
260 | ||
dc023dce IPG |
261 | /* |
262 | * Cancel any pending scheduled resets | |
263 | * | |
264 | * [see usb_queue_reset_device()] | |
265 | * | |
266 | * Called after unconfiguring / when releasing interfaces. See | |
267 | * comments in __usb_queue_reset_device() regarding | |
268 | * udev->reset_running. | |
269 | */ | |
270 | static void usb_cancel_queued_reset(struct usb_interface *iface) | |
271 | { | |
272 | if (iface->reset_running == 0) | |
273 | cancel_work_sync(&iface->reset_ws); | |
274 | } | |
8bb54ab5 AS |
275 | |
276 | /* called from driver core with dev locked */ | |
ddae41be GKH |
277 | static int usb_probe_interface(struct device *dev) |
278 | { | |
8bb54ab5 | 279 | struct usb_driver *driver = to_usb_driver(dev->driver); |
55129666 KS |
280 | struct usb_interface *intf = to_usb_interface(dev); |
281 | struct usb_device *udev = interface_to_usbdev(intf); | |
ddae41be GKH |
282 | const struct usb_device_id *id; |
283 | int error = -ENODEV; | |
284 | ||
441b62c1 | 285 | dev_dbg(dev, "%s\n", __func__); |
ddae41be | 286 | |
78d9a487 | 287 | intf->needs_binding = 0; |
ddae41be | 288 | |
7cbe5dca | 289 | if (usb_device_is_owned(udev)) |
0f3dda9f | 290 | return error; |
7cbe5dca | 291 | |
2c044a48 GKH |
292 | if (udev->authorized == 0) { |
293 | dev_err(&intf->dev, "Device is not authorized for usage\n"); | |
0f3dda9f | 294 | return error; |
2c044a48 | 295 | } |
72230abb | 296 | |
ddae41be | 297 | id = usb_match_id(intf, driver->id_table); |
733260ff GKH |
298 | if (!id) |
299 | id = usb_match_dynamic_id(intf, driver); | |
0f3dda9f AS |
300 | if (!id) |
301 | return error; | |
55151d7d | 302 | |
0f3dda9f AS |
303 | dev_dbg(dev, "%s - got id\n", __func__); |
304 | ||
305 | error = usb_autoresume_device(udev); | |
306 | if (error) | |
307 | return error; | |
308 | ||
0f3dda9f | 309 | intf->condition = USB_INTERFACE_BINDING; |
645daaab | 310 | |
571dc79d | 311 | /* Probed interfaces are initially active. They are |
9bbdf1e0 AS |
312 | * runtime-PM-enabled only if the driver has autosuspend support. |
313 | * They are sensitive to their children's power states. | |
0f3dda9f | 314 | */ |
9bbdf1e0 AS |
315 | pm_runtime_set_active(dev); |
316 | pm_suspend_ignore_children(dev, false); | |
317 | if (driver->supports_autosuspend) | |
318 | pm_runtime_enable(dev); | |
0f3dda9f AS |
319 | |
320 | /* Carry out a deferred switch to altsetting 0 */ | |
321 | if (intf->needs_altsetting0) { | |
322 | error = usb_set_interface(udev, intf->altsetting[0]. | |
323 | desc.bInterfaceNumber, 0); | |
324 | if (error < 0) | |
325 | goto err; | |
326 | intf->needs_altsetting0 = 0; | |
ddae41be GKH |
327 | } |
328 | ||
0f3dda9f AS |
329 | error = driver->probe(intf, id); |
330 | if (error) | |
331 | goto err; | |
332 | ||
333 | intf->condition = USB_INTERFACE_BOUND; | |
334 | usb_autosuspend_device(udev); | |
ddae41be | 335 | return error; |
1e5ea5e3 | 336 | |
0f3dda9f | 337 | err: |
1e5ea5e3 ON |
338 | intf->needs_remote_wakeup = 0; |
339 | intf->condition = USB_INTERFACE_UNBOUND; | |
340 | usb_cancel_queued_reset(intf); | |
9bbdf1e0 AS |
341 | |
342 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ | |
89842ae6 AS |
343 | if (driver->supports_autosuspend) |
344 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
345 | pm_runtime_set_suspended(dev); |
346 | ||
1e5ea5e3 ON |
347 | usb_autosuspend_device(udev); |
348 | return error; | |
ddae41be GKH |
349 | } |
350 | ||
8bb54ab5 | 351 | /* called from driver core with dev locked */ |
ddae41be GKH |
352 | static int usb_unbind_interface(struct device *dev) |
353 | { | |
8bb54ab5 | 354 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 355 | struct usb_interface *intf = to_usb_interface(dev); |
645daaab | 356 | struct usb_device *udev; |
1e5ea5e3 | 357 | int error, r; |
ddae41be GKH |
358 | |
359 | intf->condition = USB_INTERFACE_UNBINDING; | |
360 | ||
645daaab AS |
361 | /* Autoresume for set_interface call below */ |
362 | udev = interface_to_usbdev(intf); | |
94fcda1f | 363 | error = usb_autoresume_device(udev); |
645daaab | 364 | |
9da82bd4 AS |
365 | /* Terminate all URBs for this interface unless the driver |
366 | * supports "soft" unbinding. | |
367 | */ | |
368 | if (!driver->soft_unbind) | |
ddeac4e7 | 369 | usb_disable_interface(udev, intf, false); |
ddae41be | 370 | |
8bb54ab5 | 371 | driver->disconnect(intf); |
dc023dce | 372 | usb_cancel_queued_reset(intf); |
ddae41be | 373 | |
55151d7d AS |
374 | /* Reset other interface state. |
375 | * We cannot do a Set-Interface if the device is suspended or | |
376 | * if it is prepared for a system sleep (since installing a new | |
377 | * altsetting means creating new endpoint device entries). | |
378 | * When either of these happens, defer the Set-Interface. | |
379 | */ | |
2caf7fcd AS |
380 | if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
381 | /* Already in altsetting 0 so skip Set-Interface. | |
382 | * Just re-enable it without affecting the endpoint toggles. | |
383 | */ | |
384 | usb_enable_interface(udev, intf, false); | |
f76b168b | 385 | } else if (!error && !intf->dev.power.is_prepared) { |
1e5ea5e3 | 386 | r = usb_set_interface(udev, intf->altsetting[0]. |
55151d7d | 387 | desc.bInterfaceNumber, 0); |
1e5ea5e3 ON |
388 | if (r < 0) |
389 | intf->needs_altsetting0 = 1; | |
390 | } else { | |
55151d7d | 391 | intf->needs_altsetting0 = 1; |
1e5ea5e3 | 392 | } |
ddae41be | 393 | usb_set_intfdata(intf, NULL); |
645daaab | 394 | |
ddae41be | 395 | intf->condition = USB_INTERFACE_UNBOUND; |
645daaab AS |
396 | intf->needs_remote_wakeup = 0; |
397 | ||
9bbdf1e0 | 398 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
89842ae6 AS |
399 | if (driver->supports_autosuspend) |
400 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
401 | pm_runtime_set_suspended(dev); |
402 | ||
403 | /* Undo any residual pm_autopm_get_interface_* calls */ | |
404 | for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r) | |
405 | usb_autopm_put_interface_no_suspend(intf); | |
406 | atomic_set(&intf->pm_usage_cnt, 0); | |
407 | ||
645daaab | 408 | if (!error) |
94fcda1f | 409 | usb_autosuspend_device(udev); |
ddae41be GKH |
410 | |
411 | return 0; | |
412 | } | |
413 | ||
36e56a34 AS |
414 | /** |
415 | * usb_driver_claim_interface - bind a driver to an interface | |
416 | * @driver: the driver to be bound | |
417 | * @iface: the interface to which it will be bound; must be in the | |
418 | * usb device's active configuration | |
419 | * @priv: driver data associated with that interface | |
420 | * | |
421 | * This is used by usb device drivers that need to claim more than one | |
422 | * interface on a device when probing (audio and acm are current examples). | |
423 | * No device driver should directly modify internal usb_interface or | |
424 | * usb_device structure members. | |
425 | * | |
426 | * Few drivers should need to use this routine, since the most natural | |
427 | * way to bind to an interface is to return the private data from | |
428 | * the driver's probe() method. | |
429 | * | |
341487a8 GKH |
430 | * Callers must own the device lock, so driver probe() entries don't need |
431 | * extra locking, but other call contexts may need to explicitly claim that | |
432 | * lock. | |
36e56a34 AS |
433 | */ |
434 | int usb_driver_claim_interface(struct usb_driver *driver, | |
2c044a48 | 435 | struct usb_interface *iface, void *priv) |
36e56a34 AS |
436 | { |
437 | struct device *dev = &iface->dev; | |
1b21d5e1 | 438 | int retval = 0; |
36e56a34 AS |
439 | |
440 | if (dev->driver) | |
441 | return -EBUSY; | |
442 | ||
8bb54ab5 | 443 | dev->driver = &driver->drvwrap.driver; |
36e56a34 | 444 | usb_set_intfdata(iface, priv); |
78d9a487 | 445 | iface->needs_binding = 0; |
645daaab | 446 | |
36e56a34 | 447 | iface->condition = USB_INTERFACE_BOUND; |
9bbdf1e0 | 448 | |
89842ae6 AS |
449 | /* Claimed interfaces are initially inactive (suspended) and |
450 | * runtime-PM-enabled, but only if the driver has autosuspend | |
451 | * support. Otherwise they are marked active, to prevent the | |
452 | * device from being autosuspended, but left disabled. In either | |
453 | * case they are sensitive to their children's power states. | |
9bbdf1e0 | 454 | */ |
9bbdf1e0 AS |
455 | pm_suspend_ignore_children(dev, false); |
456 | if (driver->supports_autosuspend) | |
457 | pm_runtime_enable(dev); | |
89842ae6 AS |
458 | else |
459 | pm_runtime_set_active(dev); | |
36e56a34 AS |
460 | |
461 | /* if interface was already added, bind now; else let | |
462 | * the future device_add() bind it, bypassing probe() | |
463 | */ | |
464 | if (device_is_registered(dev)) | |
1b21d5e1 | 465 | retval = device_bind_driver(dev); |
36e56a34 | 466 | |
1b21d5e1 | 467 | return retval; |
36e56a34 | 468 | } |
782e70c6 | 469 | EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
36e56a34 AS |
470 | |
471 | /** | |
472 | * usb_driver_release_interface - unbind a driver from an interface | |
473 | * @driver: the driver to be unbound | |
474 | * @iface: the interface from which it will be unbound | |
475 | * | |
476 | * This can be used by drivers to release an interface without waiting | |
477 | * for their disconnect() methods to be called. In typical cases this | |
478 | * also causes the driver disconnect() method to be called. | |
479 | * | |
480 | * This call is synchronous, and may not be used in an interrupt context. | |
341487a8 GKH |
481 | * Callers must own the device lock, so driver disconnect() entries don't |
482 | * need extra locking, but other call contexts may need to explicitly claim | |
483 | * that lock. | |
36e56a34 AS |
484 | */ |
485 | void usb_driver_release_interface(struct usb_driver *driver, | |
486 | struct usb_interface *iface) | |
487 | { | |
488 | struct device *dev = &iface->dev; | |
489 | ||
490 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 491 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
492 | return; |
493 | ||
494 | /* don't release from within disconnect() */ | |
495 | if (iface->condition != USB_INTERFACE_BOUND) | |
496 | return; | |
91f8d063 | 497 | iface->condition = USB_INTERFACE_UNBINDING; |
36e56a34 | 498 | |
91f8d063 AS |
499 | /* Release via the driver core only if the interface |
500 | * has already been registered | |
501 | */ | |
36e56a34 | 502 | if (device_is_registered(dev)) { |
36e56a34 | 503 | device_release_driver(dev); |
dc023dce | 504 | } else { |
8e9394ce | 505 | device_lock(dev); |
91f8d063 AS |
506 | usb_unbind_interface(dev); |
507 | dev->driver = NULL; | |
8e9394ce | 508 | device_unlock(dev); |
36e56a34 | 509 | } |
36e56a34 | 510 | } |
782e70c6 | 511 | EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
36e56a34 | 512 | |
733260ff | 513 | /* returns 0 if no match, 1 if match */ |
bb417020 | 514 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
733260ff | 515 | { |
733260ff GKH |
516 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
517 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
518 | return 0; | |
519 | ||
520 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
521 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
522 | return 0; | |
523 | ||
524 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
525 | greater than any unsigned number. */ | |
526 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
527 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
528 | return 0; | |
529 | ||
530 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
531 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
532 | return 0; | |
533 | ||
534 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
535 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
536 | return 0; | |
537 | ||
538 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
2c044a48 | 539 | (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
733260ff GKH |
540 | return 0; |
541 | ||
542 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
543 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
544 | return 0; | |
545 | ||
bb417020 GKH |
546 | return 1; |
547 | } | |
548 | ||
549 | /* returns 0 if no match, 1 if match */ | |
550 | int usb_match_one_id(struct usb_interface *interface, | |
551 | const struct usb_device_id *id) | |
552 | { | |
553 | struct usb_host_interface *intf; | |
554 | struct usb_device *dev; | |
555 | ||
556 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
557 | if (id == NULL) | |
558 | return 0; | |
559 | ||
560 | intf = interface->cur_altsetting; | |
561 | dev = interface_to_usbdev(interface); | |
562 | ||
563 | if (!usb_match_device(dev, id)) | |
564 | return 0; | |
565 | ||
93c8bf45 AS |
566 | /* The interface class, subclass, and protocol should never be |
567 | * checked for a match if the device class is Vendor Specific, | |
568 | * unless the match record specifies the Vendor ID. */ | |
569 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && | |
570 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
571 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | | |
572 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
573 | USB_DEVICE_ID_MATCH_INT_PROTOCOL))) | |
574 | return 0; | |
575 | ||
733260ff GKH |
576 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
577 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
578 | return 0; | |
579 | ||
580 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
581 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
582 | return 0; | |
583 | ||
584 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
585 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
586 | return 0; | |
587 | ||
588 | return 1; | |
589 | } | |
93bacefc GKH |
590 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
591 | ||
ddae41be GKH |
592 | /** |
593 | * usb_match_id - find first usb_device_id matching device or interface | |
594 | * @interface: the interface of interest | |
595 | * @id: array of usb_device_id structures, terminated by zero entry | |
596 | * | |
597 | * usb_match_id searches an array of usb_device_id's and returns | |
598 | * the first one matching the device or interface, or null. | |
599 | * This is used when binding (or rebinding) a driver to an interface. | |
600 | * Most USB device drivers will use this indirectly, through the usb core, | |
601 | * but some layered driver frameworks use it directly. | |
602 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
603 | * modutils, to support the driver loading functionality of USB hotplugging. | |
604 | * | |
605 | * What Matches: | |
606 | * | |
607 | * The "match_flags" element in a usb_device_id controls which | |
608 | * members are used. If the corresponding bit is set, the | |
609 | * value in the device_id must match its corresponding member | |
610 | * in the device or interface descriptor, or else the device_id | |
611 | * does not match. | |
612 | * | |
613 | * "driver_info" is normally used only by device drivers, | |
614 | * but you can create a wildcard "matches anything" usb_device_id | |
615 | * as a driver's "modules.usbmap" entry if you provide an id with | |
616 | * only a nonzero "driver_info" field. If you do this, the USB device | |
617 | * driver's probe() routine should use additional intelligence to | |
618 | * decide whether to bind to the specified interface. | |
619 | * | |
620 | * What Makes Good usb_device_id Tables: | |
621 | * | |
622 | * The match algorithm is very simple, so that intelligence in | |
623 | * driver selection must come from smart driver id records. | |
624 | * Unless you have good reasons to use another selection policy, | |
625 | * provide match elements only in related groups, and order match | |
626 | * specifiers from specific to general. Use the macros provided | |
627 | * for that purpose if you can. | |
628 | * | |
629 | * The most specific match specifiers use device descriptor | |
630 | * data. These are commonly used with product-specific matches; | |
631 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
632 | * and you can also match against ranges of product revisions. | |
633 | * These are widely used for devices with application or vendor | |
634 | * specific bDeviceClass values. | |
635 | * | |
636 | * Matches based on device class/subclass/protocol specifications | |
637 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
638 | * its siblings. These are used with single-function devices | |
639 | * where bDeviceClass doesn't specify that each interface has | |
640 | * its own class. | |
641 | * | |
642 | * Matches based on interface class/subclass/protocol are the | |
643 | * most general; they let drivers bind to any interface on a | |
644 | * multiple-function device. Use the USB_INTERFACE_INFO | |
645 | * macro, or its siblings, to match class-per-interface style | |
93c8bf45 AS |
646 | * devices (as recorded in bInterfaceClass). |
647 | * | |
648 | * Note that an entry created by USB_INTERFACE_INFO won't match | |
649 | * any interface if the device class is set to Vendor-Specific. | |
650 | * This is deliberate; according to the USB spec the meanings of | |
651 | * the interface class/subclass/protocol for these devices are also | |
652 | * vendor-specific, and hence matching against a standard product | |
653 | * class wouldn't work anyway. If you really want to use an | |
654 | * interface-based match for such a device, create a match record | |
655 | * that also specifies the vendor ID. (Unforunately there isn't a | |
656 | * standard macro for creating records like this.) | |
ddae41be GKH |
657 | * |
658 | * Within those groups, remember that not all combinations are | |
659 | * meaningful. For example, don't give a product version range | |
660 | * without vendor and product IDs; or specify a protocol without | |
661 | * its associated class and subclass. | |
662 | */ | |
663 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
664 | const struct usb_device_id *id) | |
665 | { | |
ddae41be GKH |
666 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
667 | if (id == NULL) | |
668 | return NULL; | |
669 | ||
ddae41be GKH |
670 | /* It is important to check that id->driver_info is nonzero, |
671 | since an entry that is all zeroes except for a nonzero | |
672 | id->driver_info is the way to create an entry that | |
673 | indicates that the driver want to examine every | |
674 | device and interface. */ | |
de6f92b9 GKH |
675 | for (; id->idVendor || id->idProduct || id->bDeviceClass || |
676 | id->bInterfaceClass || id->driver_info; id++) { | |
733260ff GKH |
677 | if (usb_match_one_id(interface, id)) |
678 | return id; | |
ddae41be GKH |
679 | } |
680 | ||
681 | return NULL; | |
682 | } | |
782e70c6 | 683 | EXPORT_SYMBOL_GPL(usb_match_id); |
ddae41be | 684 | |
8bb22d2b | 685 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
ddae41be | 686 | { |
8bb54ab5 AS |
687 | /* devices and interfaces are handled separately */ |
688 | if (is_usb_device(dev)) { | |
ddae41be | 689 | |
8bb54ab5 AS |
690 | /* interface drivers never match devices */ |
691 | if (!is_usb_device_driver(drv)) | |
692 | return 0; | |
ddae41be | 693 | |
8bb54ab5 | 694 | /* TODO: Add real matching code */ |
ddae41be GKH |
695 | return 1; |
696 | ||
55129666 | 697 | } else if (is_usb_interface(dev)) { |
8bb54ab5 AS |
698 | struct usb_interface *intf; |
699 | struct usb_driver *usb_drv; | |
700 | const struct usb_device_id *id; | |
701 | ||
702 | /* device drivers never match interfaces */ | |
703 | if (is_usb_device_driver(drv)) | |
704 | return 0; | |
705 | ||
706 | intf = to_usb_interface(dev); | |
707 | usb_drv = to_usb_driver(drv); | |
708 | ||
709 | id = usb_match_id(intf, usb_drv->id_table); | |
710 | if (id) | |
711 | return 1; | |
712 | ||
713 | id = usb_match_dynamic_id(intf, usb_drv); | |
714 | if (id) | |
715 | return 1; | |
716 | } | |
717 | ||
ddae41be GKH |
718 | return 0; |
719 | } | |
720 | ||
36e56a34 | 721 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 722 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 | 723 | { |
36e56a34 | 724 | struct usb_device *usb_dev; |
36e56a34 | 725 | |
55129666 | 726 | if (is_usb_device(dev)) { |
782da727 | 727 | usb_dev = to_usb_device(dev); |
55129666 | 728 | } else if (is_usb_interface(dev)) { |
9f8b17e6 | 729 | struct usb_interface *intf = to_usb_interface(dev); |
55129666 | 730 | |
8bb54ab5 | 731 | usb_dev = interface_to_usbdev(intf); |
55129666 KS |
732 | } else { |
733 | return 0; | |
8bb54ab5 | 734 | } |
36e56a34 AS |
735 | |
736 | if (usb_dev->devnum < 0) { | |
cceffe93 | 737 | /* driver is often null here; dev_dbg() would oops */ |
7071a3ce | 738 | pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
36e56a34 AS |
739 | return -ENODEV; |
740 | } | |
741 | if (!usb_dev->bus) { | |
7071a3ce | 742 | pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
36e56a34 AS |
743 | return -ENODEV; |
744 | } | |
745 | ||
746 | #ifdef CONFIG_USB_DEVICEFS | |
747 | /* If this is available, userspace programs can directly read | |
748 | * all the device descriptors we don't tell them about. Or | |
9f8b17e6 | 749 | * act as usermode drivers. |
36e56a34 | 750 | */ |
7eff2e7a | 751 | if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d", |
36e56a34 AS |
752 | usb_dev->bus->busnum, usb_dev->devnum)) |
753 | return -ENOMEM; | |
754 | #endif | |
755 | ||
756 | /* per-device configurations are common */ | |
7eff2e7a | 757 | if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
36e56a34 AS |
758 | le16_to_cpu(usb_dev->descriptor.idVendor), |
759 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
760 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
761 | return -ENOMEM; | |
762 | ||
763 | /* class-based driver binding models */ | |
7eff2e7a | 764 | if (add_uevent_var(env, "TYPE=%d/%d/%d", |
36e56a34 AS |
765 | usb_dev->descriptor.bDeviceClass, |
766 | usb_dev->descriptor.bDeviceSubClass, | |
767 | usb_dev->descriptor.bDeviceProtocol)) | |
768 | return -ENOMEM; | |
769 | ||
36e56a34 AS |
770 | return 0; |
771 | } | |
772 | ||
773 | #else | |
774 | ||
7eff2e7a | 775 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 AS |
776 | { |
777 | return -ENODEV; | |
778 | } | |
36e56a34 AS |
779 | #endif /* CONFIG_HOTPLUG */ |
780 | ||
ddae41be | 781 | /** |
8bb54ab5 AS |
782 | * usb_register_device_driver - register a USB device (not interface) driver |
783 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 784 | * @owner: module owner of this driver. |
ddae41be | 785 | * |
8bb54ab5 AS |
786 | * Registers a USB device driver with the USB core. The list of |
787 | * unattached devices will be rescanned whenever a new driver is | |
788 | * added, allowing the new driver to attach to any recognized devices. | |
789 | * Returns a negative error code on failure and 0 on success. | |
790 | */ | |
791 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
792 | struct module *owner) | |
793 | { | |
794 | int retval = 0; | |
795 | ||
796 | if (usb_disabled()) | |
797 | return -ENODEV; | |
798 | ||
799 | new_udriver->drvwrap.for_devices = 1; | |
800 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; | |
801 | new_udriver->drvwrap.driver.bus = &usb_bus_type; | |
802 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
803 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
804 | new_udriver->drvwrap.driver.owner = owner; | |
805 | ||
806 | retval = driver_register(&new_udriver->drvwrap.driver); | |
807 | ||
808 | if (!retval) { | |
809 | pr_info("%s: registered new device driver %s\n", | |
810 | usbcore_name, new_udriver->name); | |
811 | usbfs_update_special(); | |
812 | } else { | |
813 | printk(KERN_ERR "%s: error %d registering device " | |
814 | " driver %s\n", | |
815 | usbcore_name, retval, new_udriver->name); | |
816 | } | |
817 | ||
818 | return retval; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
821 | ||
822 | /** | |
823 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
824 | * @udriver: USB operations of the device driver to unregister | |
825 | * Context: must be able to sleep | |
826 | * | |
827 | * Unlinks the specified driver from the internal USB driver list. | |
828 | */ | |
829 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
830 | { | |
831 | pr_info("%s: deregistering device driver %s\n", | |
832 | usbcore_name, udriver->name); | |
833 | ||
834 | driver_unregister(&udriver->drvwrap.driver); | |
835 | usbfs_update_special(); | |
836 | } | |
837 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
838 | ||
839 | /** | |
840 | * usb_register_driver - register a USB interface driver | |
841 | * @new_driver: USB operations for the interface driver | |
842 | * @owner: module owner of this driver. | |
892705a1 | 843 | * @mod_name: module name string |
8bb54ab5 AS |
844 | * |
845 | * Registers a USB interface driver with the USB core. The list of | |
846 | * unattached interfaces will be rescanned whenever a new driver is | |
847 | * added, allowing the new driver to attach to any recognized interfaces. | |
ddae41be GKH |
848 | * Returns a negative error code on failure and 0 on success. |
849 | * | |
850 | * NOTE: if you want your driver to use the USB major number, you must call | |
851 | * usb_register_dev() to enable that functionality. This function no longer | |
852 | * takes care of that. | |
853 | */ | |
80f745fb GKH |
854 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
855 | const char *mod_name) | |
ddae41be GKH |
856 | { |
857 | int retval = 0; | |
858 | ||
859 | if (usb_disabled()) | |
860 | return -ENODEV; | |
861 | ||
8bb54ab5 AS |
862 | new_driver->drvwrap.for_devices = 0; |
863 | new_driver->drvwrap.driver.name = (char *) new_driver->name; | |
864 | new_driver->drvwrap.driver.bus = &usb_bus_type; | |
865 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
866 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
867 | new_driver->drvwrap.driver.owner = owner; | |
80f745fb | 868 | new_driver->drvwrap.driver.mod_name = mod_name; |
733260ff GKH |
869 | spin_lock_init(&new_driver->dynids.lock); |
870 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 871 | |
8bb54ab5 | 872 | retval = driver_register(&new_driver->drvwrap.driver); |
0c7a2b72 CR |
873 | if (retval) |
874 | goto out; | |
ddae41be | 875 | |
0c7a2b72 CR |
876 | usbfs_update_special(); |
877 | ||
878 | retval = usb_create_newid_file(new_driver); | |
879 | if (retval) | |
880 | goto out_newid; | |
881 | ||
882 | retval = usb_create_removeid_file(new_driver); | |
883 | if (retval) | |
884 | goto out_removeid; | |
885 | ||
886 | pr_info("%s: registered new interface driver %s\n", | |
ddae41be | 887 | usbcore_name, new_driver->name); |
ddae41be | 888 | |
0c7a2b72 | 889 | out: |
ddae41be | 890 | return retval; |
0c7a2b72 CR |
891 | |
892 | out_removeid: | |
893 | usb_remove_newid_file(new_driver); | |
894 | out_newid: | |
895 | driver_unregister(&new_driver->drvwrap.driver); | |
896 | ||
897 | printk(KERN_ERR "%s: error %d registering interface " | |
898 | " driver %s\n", | |
899 | usbcore_name, retval, new_driver->name); | |
900 | goto out; | |
ddae41be | 901 | } |
782e70c6 | 902 | EXPORT_SYMBOL_GPL(usb_register_driver); |
ddae41be GKH |
903 | |
904 | /** | |
8bb54ab5 AS |
905 | * usb_deregister - unregister a USB interface driver |
906 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
907 | * Context: must be able to sleep |
908 | * | |
909 | * Unlinks the specified driver from the internal USB driver list. | |
910 | * | |
911 | * NOTE: If you called usb_register_dev(), you still need to call | |
912 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
913 | * this * call will no longer do it for you. | |
914 | */ | |
915 | void usb_deregister(struct usb_driver *driver) | |
916 | { | |
8bb54ab5 AS |
917 | pr_info("%s: deregistering interface driver %s\n", |
918 | usbcore_name, driver->name); | |
ddae41be | 919 | |
0c7a2b72 | 920 | usb_remove_removeid_file(driver); |
ba9dc657 | 921 | usb_remove_newid_file(driver); |
733260ff | 922 | usb_free_dynids(driver); |
8bb54ab5 | 923 | driver_unregister(&driver->drvwrap.driver); |
ddae41be GKH |
924 | |
925 | usbfs_update_special(); | |
926 | } | |
782e70c6 | 927 | EXPORT_SYMBOL_GPL(usb_deregister); |
36e56a34 | 928 | |
78d9a487 AS |
929 | /* Forced unbinding of a USB interface driver, either because |
930 | * it doesn't support pre_reset/post_reset/reset_resume or | |
931 | * because it doesn't support suspend/resume. | |
932 | * | |
933 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
934 | * and not @intf->dev.sem. | |
935 | */ | |
936 | void usb_forced_unbind_intf(struct usb_interface *intf) | |
937 | { | |
938 | struct usb_driver *driver = to_usb_driver(intf->dev.driver); | |
939 | ||
940 | dev_dbg(&intf->dev, "forced unbind\n"); | |
941 | usb_driver_release_interface(driver, intf); | |
942 | ||
943 | /* Mark the interface for later rebinding */ | |
944 | intf->needs_binding = 1; | |
945 | } | |
946 | ||
947 | /* Delayed forced unbinding of a USB interface driver and scan | |
948 | * for rebinding. | |
949 | * | |
950 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
951 | * and not @intf->dev.sem. | |
952 | * | |
5096aedc AS |
953 | * Note: Rebinds will be skipped if a system sleep transition is in |
954 | * progress and the PM "complete" callback hasn't occurred yet. | |
78d9a487 AS |
955 | */ |
956 | void usb_rebind_intf(struct usb_interface *intf) | |
957 | { | |
958 | int rc; | |
959 | ||
960 | /* Delayed unbind of an existing driver */ | |
961 | if (intf->dev.driver) { | |
962 | struct usb_driver *driver = | |
963 | to_usb_driver(intf->dev.driver); | |
964 | ||
965 | dev_dbg(&intf->dev, "forced unbind\n"); | |
966 | usb_driver_release_interface(driver, intf); | |
967 | } | |
968 | ||
969 | /* Try to rebind the interface */ | |
f76b168b | 970 | if (!intf->dev.power.is_prepared) { |
5096aedc AS |
971 | intf->needs_binding = 0; |
972 | rc = device_attach(&intf->dev); | |
973 | if (rc < 0) | |
974 | dev_warn(&intf->dev, "rebind failed: %d\n", rc); | |
975 | } | |
78d9a487 AS |
976 | } |
977 | ||
9ff78433 AS |
978 | #ifdef CONFIG_PM |
979 | ||
78d9a487 AS |
980 | #define DO_UNBIND 0 |
981 | #define DO_REBIND 1 | |
982 | ||
983 | /* Unbind drivers for @udev's interfaces that don't support suspend/resume, | |
984 | * or rebind interfaces that have been unbound, according to @action. | |
985 | * | |
986 | * The caller must hold @udev's device lock. | |
78d9a487 AS |
987 | */ |
988 | static void do_unbind_rebind(struct usb_device *udev, int action) | |
989 | { | |
990 | struct usb_host_config *config; | |
991 | int i; | |
992 | struct usb_interface *intf; | |
993 | struct usb_driver *drv; | |
994 | ||
995 | config = udev->actconfig; | |
996 | if (config) { | |
997 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
998 | intf = config->interface[i]; | |
999 | switch (action) { | |
1000 | case DO_UNBIND: | |
1001 | if (intf->dev.driver) { | |
1002 | drv = to_usb_driver(intf->dev.driver); | |
1003 | if (!drv->suspend || !drv->resume) | |
1004 | usb_forced_unbind_intf(intf); | |
1005 | } | |
1006 | break; | |
1007 | case DO_REBIND: | |
5096aedc | 1008 | if (intf->needs_binding) |
78d9a487 | 1009 | usb_rebind_intf(intf); |
78d9a487 AS |
1010 | break; |
1011 | } | |
1012 | } | |
1013 | } | |
1014 | } | |
1015 | ||
d5ec1686 | 1016 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
36e56a34 | 1017 | { |
782da727 | 1018 | struct usb_device_driver *udriver; |
2bf4086d | 1019 | int status = 0; |
36e56a34 | 1020 | |
114b368c AS |
1021 | if (udev->state == USB_STATE_NOTATTACHED || |
1022 | udev->state == USB_STATE_SUSPENDED) | |
1023 | goto done; | |
1024 | ||
b6f6436d AS |
1025 | /* For devices that don't have a driver, we do a generic suspend. */ |
1026 | if (udev->dev.driver) | |
1027 | udriver = to_usb_device_driver(udev->dev.driver); | |
1028 | else { | |
645daaab | 1029 | udev->do_remote_wakeup = 0; |
b6f6436d | 1030 | udriver = &usb_generic_driver; |
1c5df7e7 | 1031 | } |
2bf4086d AS |
1032 | status = udriver->suspend(udev, msg); |
1033 | ||
20dfdad7 | 1034 | done: |
441b62c1 | 1035 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1036 | return status; |
1cc8a25d AS |
1037 | } |
1038 | ||
65bfd296 | 1039 | static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
1cc8a25d AS |
1040 | { |
1041 | struct usb_device_driver *udriver; | |
2bf4086d | 1042 | int status = 0; |
36e56a34 | 1043 | |
0458d5b4 AS |
1044 | if (udev->state == USB_STATE_NOTATTACHED) |
1045 | goto done; | |
1cc8a25d | 1046 | |
1c5df7e7 AS |
1047 | /* Can't resume it if it doesn't have a driver. */ |
1048 | if (udev->dev.driver == NULL) { | |
1049 | status = -ENOTCONN; | |
2bf4086d | 1050 | goto done; |
1c5df7e7 AS |
1051 | } |
1052 | ||
6d19c009 AS |
1053 | /* Non-root devices on a full/low-speed bus must wait for their |
1054 | * companion high-speed root hub, in case a handoff is needed. | |
1055 | */ | |
5b1b0b81 | 1056 | if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion) |
6d19c009 AS |
1057 | device_pm_wait_for_dev(&udev->dev, |
1058 | &udev->bus->hs_companion->root_hub->dev); | |
1059 | ||
6bc6cff5 AS |
1060 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
1061 | udev->reset_resume = 1; | |
1062 | ||
1cc8a25d | 1063 | udriver = to_usb_device_driver(udev->dev.driver); |
65bfd296 | 1064 | status = udriver->resume(udev, msg); |
2bf4086d | 1065 | |
20dfdad7 | 1066 | done: |
441b62c1 | 1067 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1068 | return status; |
1cc8a25d AS |
1069 | } |
1070 | ||
65605ae8 AS |
1071 | static int usb_suspend_interface(struct usb_device *udev, |
1072 | struct usb_interface *intf, pm_message_t msg) | |
1cc8a25d AS |
1073 | { |
1074 | struct usb_driver *driver; | |
2bf4086d | 1075 | int status = 0; |
1cc8a25d | 1076 | |
9bbdf1e0 AS |
1077 | if (udev->state == USB_STATE_NOTATTACHED || |
1078 | intf->condition == USB_INTERFACE_UNBOUND) | |
2bf4086d | 1079 | goto done; |
114b368c | 1080 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1081 | |
78d9a487 | 1082 | if (driver->suspend) { |
1cc8a25d | 1083 | status = driver->suspend(intf, msg); |
5b1b0b81 | 1084 | if (status && !PMSG_IS_AUTO(msg)) |
1cc8a25d AS |
1085 | dev_err(&intf->dev, "%s error %d\n", |
1086 | "suspend", status); | |
36e56a34 | 1087 | } else { |
78d9a487 AS |
1088 | /* Later we will unbind the driver and reprobe */ |
1089 | intf->needs_binding = 1; | |
1090 | dev_warn(&intf->dev, "no %s for driver %s?\n", | |
1091 | "suspend", driver->name); | |
36e56a34 | 1092 | } |
2bf4086d | 1093 | |
20dfdad7 | 1094 | done: |
441b62c1 | 1095 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
36e56a34 AS |
1096 | return status; |
1097 | } | |
1098 | ||
65605ae8 | 1099 | static int usb_resume_interface(struct usb_device *udev, |
65bfd296 | 1100 | struct usb_interface *intf, pm_message_t msg, int reset_resume) |
36e56a34 | 1101 | { |
1cc8a25d | 1102 | struct usb_driver *driver; |
2bf4086d | 1103 | int status = 0; |
36e56a34 | 1104 | |
9bbdf1e0 | 1105 | if (udev->state == USB_STATE_NOTATTACHED) |
2bf4086d | 1106 | goto done; |
36e56a34 | 1107 | |
645daaab AS |
1108 | /* Don't let autoresume interfere with unbinding */ |
1109 | if (intf->condition == USB_INTERFACE_UNBINDING) | |
1110 | goto done; | |
1111 | ||
1c5df7e7 | 1112 | /* Can't resume it if it doesn't have a driver. */ |
55151d7d AS |
1113 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
1114 | ||
1115 | /* Carry out a deferred switch to altsetting 0 */ | |
f76b168b | 1116 | if (intf->needs_altsetting0 && !intf->dev.power.is_prepared) { |
55151d7d AS |
1117 | usb_set_interface(udev, intf->altsetting[0]. |
1118 | desc.bInterfaceNumber, 0); | |
1119 | intf->needs_altsetting0 = 0; | |
1120 | } | |
78d9a487 | 1121 | goto done; |
55151d7d | 1122 | } |
78d9a487 AS |
1123 | |
1124 | /* Don't resume if the interface is marked for rebinding */ | |
1125 | if (intf->needs_binding) | |
2bf4086d | 1126 | goto done; |
1cc8a25d | 1127 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1128 | |
f07600cf AS |
1129 | if (reset_resume) { |
1130 | if (driver->reset_resume) { | |
1131 | status = driver->reset_resume(intf); | |
1132 | if (status) | |
1133 | dev_err(&intf->dev, "%s error %d\n", | |
1134 | "reset_resume", status); | |
1135 | } else { | |
78d9a487 | 1136 | intf->needs_binding = 1; |
f07600cf AS |
1137 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1138 | "reset_resume", driver->name); | |
1139 | } | |
1140 | } else { | |
1141 | if (driver->resume) { | |
1142 | status = driver->resume(intf); | |
1143 | if (status) | |
1144 | dev_err(&intf->dev, "%s error %d\n", | |
1145 | "resume", status); | |
1146 | } else { | |
78d9a487 | 1147 | intf->needs_binding = 1; |
f07600cf AS |
1148 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1149 | "resume", driver->name); | |
1150 | } | |
1151 | } | |
2bf4086d AS |
1152 | |
1153 | done: | |
441b62c1 | 1154 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
f07600cf | 1155 | |
78d9a487 | 1156 | /* Later we will unbind the driver and/or reprobe, if necessary */ |
2bf4086d | 1157 | return status; |
36e56a34 AS |
1158 | } |
1159 | ||
645daaab AS |
1160 | /** |
1161 | * usb_suspend_both - suspend a USB device and its interfaces | |
1162 | * @udev: the usb_device to suspend | |
1163 | * @msg: Power Management message describing this state transition | |
1164 | * | |
1165 | * This is the central routine for suspending USB devices. It calls the | |
1166 | * suspend methods for all the interface drivers in @udev and then calls | |
1167 | * the suspend method for @udev itself. If an error occurs at any stage, | |
1168 | * all the interfaces which were suspended are resumed so that they remain | |
1169 | * in the same state as the device. | |
1170 | * | |
9bbdf1e0 AS |
1171 | * Autosuspend requests originating from a child device or an interface |
1172 | * driver may be made without the protection of @udev's device lock, but | |
1173 | * all other suspend calls will hold the lock. Usbcore will insure that | |
1174 | * method calls do not arrive during bind, unbind, or reset operations. | |
1175 | * However drivers must be prepared to handle suspend calls arriving at | |
1176 | * unpredictable times. | |
645daaab AS |
1177 | * |
1178 | * This routine can run only in process context. | |
1179 | */ | |
718efa64 | 1180 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 AS |
1181 | { |
1182 | int status = 0; | |
571dc79d | 1183 | int i = 0, n = 0; |
a8e7c565 | 1184 | struct usb_interface *intf; |
645daaab | 1185 | |
1941044a AS |
1186 | if (udev->state == USB_STATE_NOTATTACHED || |
1187 | udev->state == USB_STATE_SUSPENDED) | |
1188 | goto done; | |
a8e7c565 | 1189 | |
645daaab | 1190 | /* Suspend all the interfaces and then udev itself */ |
a8e7c565 | 1191 | if (udev->actconfig) { |
571dc79d AS |
1192 | n = udev->actconfig->desc.bNumInterfaces; |
1193 | for (i = n - 1; i >= 0; --i) { | |
a8e7c565 | 1194 | intf = udev->actconfig->interface[i]; |
65605ae8 | 1195 | status = usb_suspend_interface(udev, intf, msg); |
0af212ba AS |
1196 | |
1197 | /* Ignore errors during system sleep transitions */ | |
5b1b0b81 | 1198 | if (!PMSG_IS_AUTO(msg)) |
0af212ba | 1199 | status = 0; |
a8e7c565 AS |
1200 | if (status != 0) |
1201 | break; | |
1202 | } | |
1203 | } | |
0af212ba | 1204 | if (status == 0) { |
d5ec1686 | 1205 | status = usb_suspend_device(udev, msg); |
a8e7c565 | 1206 | |
0af212ba | 1207 | /* Again, ignore errors during system sleep transitions */ |
5b1b0b81 | 1208 | if (!PMSG_IS_AUTO(msg)) |
0af212ba AS |
1209 | status = 0; |
1210 | } | |
1211 | ||
a8e7c565 AS |
1212 | /* If the suspend failed, resume interfaces that did get suspended */ |
1213 | if (status != 0) { | |
9bbdf1e0 | 1214 | msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
571dc79d | 1215 | while (++i < n) { |
a8e7c565 | 1216 | intf = udev->actconfig->interface[i]; |
9bbdf1e0 | 1217 | usb_resume_interface(udev, intf, msg, 0); |
a8e7c565 | 1218 | } |
645daaab | 1219 | |
9bbdf1e0 AS |
1220 | /* If the suspend succeeded then prevent any more URB submissions |
1221 | * and flush any outstanding URBs. | |
6840d255 | 1222 | */ |
ef7f6c70 | 1223 | } else { |
6840d255 AS |
1224 | udev->can_submit = 0; |
1225 | for (i = 0; i < 16; ++i) { | |
1226 | usb_hcd_flush_endpoint(udev, udev->ep_out[i]); | |
1227 | usb_hcd_flush_endpoint(udev, udev->ep_in[i]); | |
1228 | } | |
ef7f6c70 | 1229 | } |
645daaab | 1230 | |
1941044a | 1231 | done: |
441b62c1 | 1232 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
a8e7c565 AS |
1233 | return status; |
1234 | } | |
1235 | ||
645daaab AS |
1236 | /** |
1237 | * usb_resume_both - resume a USB device and its interfaces | |
1238 | * @udev: the usb_device to resume | |
65bfd296 | 1239 | * @msg: Power Management message describing this state transition |
645daaab AS |
1240 | * |
1241 | * This is the central routine for resuming USB devices. It calls the | |
1242 | * the resume method for @udev and then calls the resume methods for all | |
1243 | * the interface drivers in @udev. | |
1244 | * | |
9bbdf1e0 AS |
1245 | * Autoresume requests originating from a child device or an interface |
1246 | * driver may be made without the protection of @udev's device lock, but | |
1247 | * all other resume calls will hold the lock. Usbcore will insure that | |
1248 | * method calls do not arrive during bind, unbind, or reset operations. | |
1249 | * However drivers must be prepared to handle resume calls arriving at | |
1250 | * unpredictable times. | |
645daaab AS |
1251 | * |
1252 | * This routine can run only in process context. | |
1253 | */ | |
65bfd296 | 1254 | static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 | 1255 | { |
645daaab | 1256 | int status = 0; |
a8e7c565 AS |
1257 | int i; |
1258 | struct usb_interface *intf; | |
645daaab | 1259 | |
1941044a AS |
1260 | if (udev->state == USB_STATE_NOTATTACHED) { |
1261 | status = -ENODEV; | |
1262 | goto done; | |
1263 | } | |
6840d255 | 1264 | udev->can_submit = 1; |
a8e7c565 | 1265 | |
9bbdf1e0 AS |
1266 | /* Resume the device */ |
1267 | if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) | |
65bfd296 | 1268 | status = usb_resume_device(udev, msg); |
114b368c | 1269 | |
9bbdf1e0 | 1270 | /* Resume the interfaces */ |
a8e7c565 AS |
1271 | if (status == 0 && udev->actconfig) { |
1272 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1273 | intf = udev->actconfig->interface[i]; | |
65bfd296 AS |
1274 | usb_resume_interface(udev, intf, msg, |
1275 | udev->reset_resume); | |
a8e7c565 AS |
1276 | } |
1277 | } | |
c08512c7 | 1278 | usb_mark_last_busy(udev); |
645daaab | 1279 | |
1941044a | 1280 | done: |
441b62c1 | 1281 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
70a1c9e0 AS |
1282 | if (!status) |
1283 | udev->reset_resume = 0; | |
645daaab AS |
1284 | return status; |
1285 | } | |
1286 | ||
5f677f1d AS |
1287 | static void choose_wakeup(struct usb_device *udev, pm_message_t msg) |
1288 | { | |
48826626 | 1289 | int w; |
5f677f1d AS |
1290 | |
1291 | /* Remote wakeup is needed only when we actually go to sleep. | |
1292 | * For things like FREEZE and QUIESCE, if the device is already | |
1293 | * autosuspended then its current wakeup setting is okay. | |
1294 | */ | |
1295 | if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { | |
1296 | if (udev->state != USB_STATE_SUSPENDED) | |
1297 | udev->do_remote_wakeup = 0; | |
1298 | return; | |
1299 | } | |
1300 | ||
48826626 | 1301 | /* Enable remote wakeup if it is allowed, even if no interface drivers |
5f677f1d AS |
1302 | * actually want it. |
1303 | */ | |
48826626 | 1304 | w = device_may_wakeup(&udev->dev); |
5f677f1d AS |
1305 | |
1306 | /* If the device is autosuspended with the wrong wakeup setting, | |
1307 | * autoresume now so the setting can be changed. | |
1308 | */ | |
1309 | if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup) | |
1310 | pm_runtime_resume(&udev->dev); | |
1311 | udev->do_remote_wakeup = w; | |
1312 | } | |
1313 | ||
9bbdf1e0 | 1314 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1315 | int usb_suspend(struct device *dev, pm_message_t msg) |
1316 | { | |
9bbdf1e0 | 1317 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 | 1318 | |
9bbdf1e0 | 1319 | do_unbind_rebind(udev, DO_UNBIND); |
5f677f1d | 1320 | choose_wakeup(udev, msg); |
9bbdf1e0 | 1321 | return usb_suspend_both(udev, msg); |
0c590e23 AS |
1322 | } |
1323 | ||
9bbdf1e0 | 1324 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1325 | int usb_resume(struct device *dev, pm_message_t msg) |
1326 | { | |
9bbdf1e0 | 1327 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 AS |
1328 | int status; |
1329 | ||
9bbdf1e0 AS |
1330 | /* For PM complete calls, all we do is rebind interfaces */ |
1331 | if (msg.event == PM_EVENT_ON) { | |
1332 | if (udev->state != USB_STATE_NOTATTACHED) | |
1333 | do_unbind_rebind(udev, DO_REBIND); | |
1334 | status = 0; | |
0c590e23 | 1335 | |
9bbdf1e0 AS |
1336 | /* For all other calls, take the device back to full power and |
1337 | * tell the PM core in case it was autosuspended previously. | |
c043f124 | 1338 | * Unbind the interfaces that will need rebinding later. |
0c590e23 | 1339 | */ |
9bbdf1e0 AS |
1340 | } else { |
1341 | status = usb_resume_both(udev, msg); | |
1342 | if (status == 0) { | |
1343 | pm_runtime_disable(dev); | |
1344 | pm_runtime_set_active(dev); | |
1345 | pm_runtime_enable(dev); | |
c043f124 | 1346 | do_unbind_rebind(udev, DO_REBIND); |
9bbdf1e0 AS |
1347 | } |
1348 | } | |
0c590e23 AS |
1349 | |
1350 | /* Avoid PM error messages for devices disconnected while suspended | |
1351 | * as we'll display regular disconnect messages just a bit later. | |
1352 | */ | |
7491f133 | 1353 | if (status == -ENODEV || status == -ESHUTDOWN) |
9bbdf1e0 | 1354 | status = 0; |
0c590e23 AS |
1355 | return status; |
1356 | } | |
1357 | ||
1358 | #endif /* CONFIG_PM */ | |
1359 | ||
645daaab AS |
1360 | #ifdef CONFIG_USB_SUSPEND |
1361 | ||
088f7fec AS |
1362 | /** |
1363 | * usb_enable_autosuspend - allow a USB device to be autosuspended | |
1364 | * @udev: the USB device which may be autosuspended | |
1365 | * | |
1366 | * This routine allows @udev to be autosuspended. An autosuspend won't | |
1367 | * take place until the autosuspend_delay has elapsed and all the other | |
1368 | * necessary conditions are satisfied. | |
1369 | * | |
1370 | * The caller must hold @udev's device lock. | |
1371 | */ | |
9e18c821 | 1372 | void usb_enable_autosuspend(struct usb_device *udev) |
088f7fec | 1373 | { |
9e18c821 | 1374 | pm_runtime_allow(&udev->dev); |
088f7fec AS |
1375 | } |
1376 | EXPORT_SYMBOL_GPL(usb_enable_autosuspend); | |
1377 | ||
1378 | /** | |
1379 | * usb_disable_autosuspend - prevent a USB device from being autosuspended | |
1380 | * @udev: the USB device which may not be autosuspended | |
1381 | * | |
1382 | * This routine prevents @udev from being autosuspended and wakes it up | |
1383 | * if it is already autosuspended. | |
1384 | * | |
1385 | * The caller must hold @udev's device lock. | |
1386 | */ | |
9e18c821 | 1387 | void usb_disable_autosuspend(struct usb_device *udev) |
088f7fec | 1388 | { |
9e18c821 | 1389 | pm_runtime_forbid(&udev->dev); |
088f7fec AS |
1390 | } |
1391 | EXPORT_SYMBOL_GPL(usb_disable_autosuspend); | |
1392 | ||
645daaab AS |
1393 | /** |
1394 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces | |
701f35af | 1395 | * @udev: the usb_device to autosuspend |
645daaab AS |
1396 | * |
1397 | * This routine should be called when a core subsystem is finished using | |
1398 | * @udev and wants to allow it to autosuspend. Examples would be when | |
1399 | * @udev's device file in usbfs is closed or after a configuration change. | |
1400 | * | |
9bbdf1e0 AS |
1401 | * @udev's usage counter is decremented; if it drops to 0 and all the |
1402 | * interfaces are inactive then a delayed autosuspend will be attempted. | |
1403 | * The attempt may fail (see autosuspend_check()). | |
645daaab | 1404 | * |
62e299e6 | 1405 | * The caller must hold @udev's device lock. |
645daaab AS |
1406 | * |
1407 | * This routine can run only in process context. | |
1408 | */ | |
94fcda1f | 1409 | void usb_autosuspend_device(struct usb_device *udev) |
645daaab | 1410 | { |
94fcda1f AS |
1411 | int status; |
1412 | ||
6ddf27cd | 1413 | usb_mark_last_busy(udev); |
fcc4a01e | 1414 | status = pm_runtime_put_sync_autosuspend(&udev->dev); |
9bbdf1e0 AS |
1415 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
1416 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1417 | status); | |
645daaab AS |
1418 | } |
1419 | ||
1420 | /** | |
1421 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces | |
701f35af | 1422 | * @udev: the usb_device to autoresume |
645daaab AS |
1423 | * |
1424 | * This routine should be called when a core subsystem wants to use @udev | |
94fcda1f | 1425 | * and needs to guarantee that it is not suspended. No autosuspend will |
9bbdf1e0 AS |
1426 | * occur until usb_autosuspend_device() is called. (Note that this will |
1427 | * not prevent suspend events originating in the PM core.) Examples would | |
1428 | * be when @udev's device file in usbfs is opened or when a remote-wakeup | |
94fcda1f | 1429 | * request is received. |
645daaab | 1430 | * |
94fcda1f AS |
1431 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
1432 | * However if the autoresume fails then the usage counter is re-decremented. | |
645daaab | 1433 | * |
62e299e6 | 1434 | * The caller must hold @udev's device lock. |
645daaab AS |
1435 | * |
1436 | * This routine can run only in process context. | |
1437 | */ | |
94fcda1f | 1438 | int usb_autoresume_device(struct usb_device *udev) |
645daaab AS |
1439 | { |
1440 | int status; | |
1441 | ||
9bbdf1e0 AS |
1442 | status = pm_runtime_get_sync(&udev->dev); |
1443 | if (status < 0) | |
1444 | pm_runtime_put_sync(&udev->dev); | |
1445 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1446 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1447 | status); | |
1448 | if (status > 0) | |
1449 | status = 0; | |
af4f7606 AS |
1450 | return status; |
1451 | } | |
1452 | ||
645daaab AS |
1453 | /** |
1454 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter | |
701f35af | 1455 | * @intf: the usb_interface whose counter should be decremented |
645daaab AS |
1456 | * |
1457 | * This routine should be called by an interface driver when it is | |
1458 | * finished using @intf and wants to allow it to autosuspend. A typical | |
1459 | * example would be a character-device driver when its device file is | |
1460 | * closed. | |
1461 | * | |
1462 | * The routine decrements @intf's usage counter. When the counter reaches | |
9bbdf1e0 AS |
1463 | * 0, a delayed autosuspend request for @intf's device is attempted. The |
1464 | * attempt may fail (see autosuspend_check()). | |
645daaab | 1465 | * |
645daaab AS |
1466 | * This routine can run only in process context. |
1467 | */ | |
1468 | void usb_autopm_put_interface(struct usb_interface *intf) | |
1469 | { | |
9bbdf1e0 AS |
1470 | struct usb_device *udev = interface_to_usbdev(intf); |
1471 | int status; | |
645daaab | 1472 | |
6ddf27cd | 1473 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1474 | atomic_dec(&intf->pm_usage_cnt); |
1475 | status = pm_runtime_put_sync(&intf->dev); | |
1476 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1477 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1478 | status); | |
645daaab AS |
1479 | } |
1480 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); | |
1481 | ||
9ac39f28 AS |
1482 | /** |
1483 | * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter | |
1484 | * @intf: the usb_interface whose counter should be decremented | |
1485 | * | |
9bbdf1e0 AS |
1486 | * This routine does much the same thing as usb_autopm_put_interface(): |
1487 | * It decrements @intf's usage counter and schedules a delayed | |
1488 | * autosuspend request if the counter is <= 0. The difference is that it | |
1489 | * does not perform any synchronization; callers should hold a private | |
1490 | * lock and handle all synchronization issues themselves. | |
9ac39f28 AS |
1491 | * |
1492 | * Typically a driver would call this routine during an URB's completion | |
1493 | * handler, if no more URBs were pending. | |
1494 | * | |
1495 | * This routine can run in atomic context. | |
1496 | */ | |
1497 | void usb_autopm_put_interface_async(struct usb_interface *intf) | |
1498 | { | |
1499 | struct usb_device *udev = interface_to_usbdev(intf); | |
fcc4a01e | 1500 | int status; |
9ac39f28 | 1501 | |
6ddf27cd | 1502 | usb_mark_last_busy(udev); |
9bbdf1e0 | 1503 | atomic_dec(&intf->pm_usage_cnt); |
fcc4a01e | 1504 | status = pm_runtime_put(&intf->dev); |
9bbdf1e0 AS |
1505 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1506 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1507 | status); | |
9ac39f28 AS |
1508 | } |
1509 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); | |
1510 | ||
9bbdf1e0 AS |
1511 | /** |
1512 | * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter | |
1513 | * @intf: the usb_interface whose counter should be decremented | |
1514 | * | |
1515 | * This routine decrements @intf's usage counter but does not carry out an | |
1516 | * autosuspend. | |
1517 | * | |
1518 | * This routine can run in atomic context. | |
1519 | */ | |
1520 | void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) | |
1521 | { | |
1522 | struct usb_device *udev = interface_to_usbdev(intf); | |
1523 | ||
6ddf27cd | 1524 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1525 | atomic_dec(&intf->pm_usage_cnt); |
1526 | pm_runtime_put_noidle(&intf->dev); | |
1527 | } | |
1528 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); | |
1529 | ||
645daaab AS |
1530 | /** |
1531 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter | |
701f35af | 1532 | * @intf: the usb_interface whose counter should be incremented |
645daaab AS |
1533 | * |
1534 | * This routine should be called by an interface driver when it wants to | |
1535 | * use @intf and needs to guarantee that it is not suspended. In addition, | |
1536 | * the routine prevents @intf from being autosuspended subsequently. (Note | |
1537 | * that this will not prevent suspend events originating in the PM core.) | |
1538 | * This prevention will persist until usb_autopm_put_interface() is called | |
1539 | * or @intf is unbound. A typical example would be a character-device | |
1540 | * driver when its device file is opened. | |
1541 | * | |
9bbdf1e0 AS |
1542 | * @intf's usage counter is incremented to prevent subsequent autosuspends. |
1543 | * However if the autoresume fails then the counter is re-decremented. | |
645daaab AS |
1544 | * |
1545 | * This routine can run only in process context. | |
1546 | */ | |
1547 | int usb_autopm_get_interface(struct usb_interface *intf) | |
1548 | { | |
af4f7606 | 1549 | int status; |
645daaab | 1550 | |
9bbdf1e0 AS |
1551 | status = pm_runtime_get_sync(&intf->dev); |
1552 | if (status < 0) | |
1553 | pm_runtime_put_sync(&intf->dev); | |
1554 | else | |
1555 | atomic_inc(&intf->pm_usage_cnt); | |
1556 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1557 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1558 | status); | |
1559 | if (status > 0) | |
1560 | status = 0; | |
a8e7c565 AS |
1561 | return status; |
1562 | } | |
645daaab AS |
1563 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
1564 | ||
9ac39f28 AS |
1565 | /** |
1566 | * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter | |
1567 | * @intf: the usb_interface whose counter should be incremented | |
1568 | * | |
1569 | * This routine does much the same thing as | |
9bbdf1e0 AS |
1570 | * usb_autopm_get_interface(): It increments @intf's usage counter and |
1571 | * queues an autoresume request if the device is suspended. The | |
1572 | * differences are that it does not perform any synchronization (callers | |
1573 | * should hold a private lock and handle all synchronization issues | |
1574 | * themselves), and it does not autoresume the device directly (it only | |
1575 | * queues a request). After a successful call, the device may not yet be | |
1576 | * resumed. | |
9ac39f28 AS |
1577 | * |
1578 | * This routine can run in atomic context. | |
1579 | */ | |
1580 | int usb_autopm_get_interface_async(struct usb_interface *intf) | |
1581 | { | |
63defa73 | 1582 | int status; |
9bbdf1e0 | 1583 | |
63defa73 | 1584 | status = pm_runtime_get(&intf->dev); |
9bbdf1e0 AS |
1585 | if (status < 0 && status != -EINPROGRESS) |
1586 | pm_runtime_put_noidle(&intf->dev); | |
1587 | else | |
ccf5b801 | 1588 | atomic_inc(&intf->pm_usage_cnt); |
9bbdf1e0 AS |
1589 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1590 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1591 | status); | |
c5a48592 | 1592 | if (status > 0 || status == -EINPROGRESS) |
9bbdf1e0 | 1593 | status = 0; |
9ac39f28 AS |
1594 | return status; |
1595 | } | |
1596 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); | |
1597 | ||
9bbdf1e0 AS |
1598 | /** |
1599 | * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter | |
1600 | * @intf: the usb_interface whose counter should be incremented | |
1601 | * | |
1602 | * This routine increments @intf's usage counter but does not carry out an | |
1603 | * autoresume. | |
1604 | * | |
1605 | * This routine can run in atomic context. | |
1606 | */ | |
1607 | void usb_autopm_get_interface_no_resume(struct usb_interface *intf) | |
1608 | { | |
1609 | struct usb_device *udev = interface_to_usbdev(intf); | |
1610 | ||
6ddf27cd | 1611 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1612 | atomic_inc(&intf->pm_usage_cnt); |
1613 | pm_runtime_get_noresume(&intf->dev); | |
1614 | } | |
1615 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); | |
1616 | ||
1617 | /* Internal routine to check whether we may autosuspend a device. */ | |
1618 | static int autosuspend_check(struct usb_device *udev) | |
1619 | { | |
7560d32e | 1620 | int w, i; |
9bbdf1e0 | 1621 | struct usb_interface *intf; |
9bbdf1e0 AS |
1622 | |
1623 | /* Fail if autosuspend is disabled, or any interfaces are in use, or | |
1624 | * any interface drivers require remote wakeup but it isn't available. | |
1625 | */ | |
7560d32e | 1626 | w = 0; |
9bbdf1e0 AS |
1627 | if (udev->actconfig) { |
1628 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1629 | intf = udev->actconfig->interface[i]; | |
1630 | ||
1631 | /* We don't need to check interfaces that are | |
1632 | * disabled for runtime PM. Either they are unbound | |
1633 | * or else their drivers don't support autosuspend | |
1634 | * and so they are permanently active. | |
1635 | */ | |
1636 | if (intf->dev.power.disable_depth) | |
1637 | continue; | |
1638 | if (atomic_read(&intf->dev.power.usage_count) > 0) | |
1639 | return -EBUSY; | |
7560d32e | 1640 | w |= intf->needs_remote_wakeup; |
9bbdf1e0 AS |
1641 | |
1642 | /* Don't allow autosuspend if the device will need | |
1643 | * a reset-resume and any of its interface drivers | |
1644 | * doesn't include support or needs remote wakeup. | |
1645 | */ | |
1646 | if (udev->quirks & USB_QUIRK_RESET_RESUME) { | |
1647 | struct usb_driver *driver; | |
1648 | ||
1649 | driver = to_usb_driver(intf->dev.driver); | |
1650 | if (!driver->reset_resume || | |
1651 | intf->needs_remote_wakeup) | |
1652 | return -EOPNOTSUPP; | |
1653 | } | |
1654 | } | |
1655 | } | |
7560d32e AS |
1656 | if (w && !device_can_wakeup(&udev->dev)) { |
1657 | dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); | |
1658 | return -EOPNOTSUPP; | |
1659 | } | |
1660 | udev->do_remote_wakeup = w; | |
9bbdf1e0 AS |
1661 | return 0; |
1662 | } | |
1663 | ||
e1620d59 | 1664 | int usb_runtime_suspend(struct device *dev) |
9bbdf1e0 | 1665 | { |
63defa73 ML |
1666 | struct usb_device *udev = to_usb_device(dev); |
1667 | int status; | |
718efa64 | 1668 | |
9bbdf1e0 AS |
1669 | /* A USB device can be suspended if it passes the various autosuspend |
1670 | * checks. Runtime suspend for a USB device means suspending all the | |
1671 | * interfaces and then the device itself. | |
1672 | */ | |
63defa73 ML |
1673 | if (autosuspend_check(udev) != 0) |
1674 | return -EAGAIN; | |
9bbdf1e0 | 1675 | |
63defa73 | 1676 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
b2c0a863 AS |
1677 | |
1678 | /* Allow a retry if autosuspend failed temporarily */ | |
1679 | if (status == -EAGAIN || status == -EBUSY) | |
1680 | usb_mark_last_busy(udev); | |
1681 | ||
db7c7c0a SS |
1682 | /* The PM core reacts badly unless the return code is 0, |
1683 | * -EAGAIN, or -EBUSY, so always return -EBUSY on an error. | |
1684 | */ | |
1685 | if (status != 0) | |
1686 | return -EBUSY; | |
9bbdf1e0 AS |
1687 | return status; |
1688 | } | |
1689 | ||
e1620d59 | 1690 | int usb_runtime_resume(struct device *dev) |
9bbdf1e0 | 1691 | { |
63defa73 ML |
1692 | struct usb_device *udev = to_usb_device(dev); |
1693 | int status; | |
1694 | ||
9bbdf1e0 AS |
1695 | /* Runtime resume for a USB device means resuming both the device |
1696 | * and all its interfaces. | |
1697 | */ | |
63defa73 | 1698 | status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
63defa73 | 1699 | return status; |
9bbdf1e0 AS |
1700 | } |
1701 | ||
e1620d59 | 1702 | int usb_runtime_idle(struct device *dev) |
9bbdf1e0 | 1703 | { |
63defa73 ML |
1704 | struct usb_device *udev = to_usb_device(dev); |
1705 | ||
9bbdf1e0 | 1706 | /* An idle USB device can be suspended if it passes the various |
63defa73 | 1707 | * autosuspend checks. |
9bbdf1e0 | 1708 | */ |
63defa73 | 1709 | if (autosuspend_check(udev) == 0) |
fcc4a01e | 1710 | pm_runtime_autosuspend(dev); |
9bbdf1e0 AS |
1711 | return 0; |
1712 | } | |
1713 | ||
65580b43 AX |
1714 | int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable) |
1715 | { | |
1716 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1717 | int ret = -EPERM; | |
1718 | ||
1719 | if (hcd->driver->set_usb2_hw_lpm) { | |
1720 | ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable); | |
1721 | if (!ret) | |
1722 | udev->usb2_hw_lpm_enabled = enable; | |
1723 | } | |
1724 | ||
1725 | return ret; | |
1726 | } | |
1727 | ||
645daaab | 1728 | #endif /* CONFIG_USB_SUSPEND */ |
a8e7c565 | 1729 | |
36e56a34 AS |
1730 | struct bus_type usb_bus_type = { |
1731 | .name = "usb", | |
1732 | .match = usb_device_match, | |
1733 | .uevent = usb_uevent, | |
36e56a34 | 1734 | }; |