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> | |
27 | #include "hcd.h" | |
28 | #include "usb.h" | |
29 | ||
733260ff GKH |
30 | static int usb_match_one_id(struct usb_interface *interface, |
31 | const struct usb_device_id *id); | |
32 | ||
33 | struct usb_dynid { | |
34 | struct list_head node; | |
35 | struct usb_device_id id; | |
36 | }; | |
37 | ||
733260ff GKH |
38 | #ifdef CONFIG_HOTPLUG |
39 | ||
40 | /* | |
41 | * Adds a new dynamic USBdevice ID to this driver, | |
42 | * and cause the driver to probe for all devices again. | |
43 | */ | |
44 | static ssize_t store_new_id(struct device_driver *driver, | |
45 | const char *buf, size_t count) | |
46 | { | |
47 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
48 | struct usb_dynid *dynid; | |
49 | u32 idVendor = 0; | |
50 | u32 idProduct = 0; | |
51 | int fields = 0; | |
52 | ||
53 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
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; | |
65 | ||
66 | spin_lock(&usb_drv->dynids.lock); | |
67 | list_add_tail(&usb_drv->dynids.list, &dynid->node); | |
68 | spin_unlock(&usb_drv->dynids.lock); | |
69 | ||
70 | if (get_driver(driver)) { | |
71 | driver_attach(driver); | |
72 | put_driver(driver); | |
73 | } | |
74 | ||
75 | return count; | |
76 | } | |
77 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); | |
78 | ||
79 | static int usb_create_newid_file(struct usb_driver *usb_drv) | |
80 | { | |
81 | int error = 0; | |
82 | ||
ba9dc657 GKH |
83 | if (usb_drv->no_dynamic_id) |
84 | goto exit; | |
85 | ||
733260ff | 86 | if (usb_drv->probe != NULL) |
8bb54ab5 | 87 | error = sysfs_create_file(&usb_drv->drvwrap.driver.kobj, |
733260ff | 88 | &driver_attr_new_id.attr); |
ba9dc657 | 89 | exit: |
733260ff GKH |
90 | return error; |
91 | } | |
92 | ||
ba9dc657 GKH |
93 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
94 | { | |
95 | if (usb_drv->no_dynamic_id) | |
96 | return; | |
97 | ||
98 | if (usb_drv->probe != NULL) | |
8bb54ab5 | 99 | sysfs_remove_file(&usb_drv->drvwrap.driver.kobj, |
ba9dc657 GKH |
100 | &driver_attr_new_id.attr); |
101 | } | |
102 | ||
733260ff GKH |
103 | static void usb_free_dynids(struct usb_driver *usb_drv) |
104 | { | |
105 | struct usb_dynid *dynid, *n; | |
106 | ||
107 | spin_lock(&usb_drv->dynids.lock); | |
108 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
109 | list_del(&dynid->node); | |
110 | kfree(dynid); | |
111 | } | |
112 | spin_unlock(&usb_drv->dynids.lock); | |
113 | } | |
114 | #else | |
115 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) | |
116 | { | |
117 | return 0; | |
118 | } | |
119 | ||
ba9dc657 GKH |
120 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
121 | { | |
122 | } | |
123 | ||
733260ff GKH |
124 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
125 | { | |
126 | } | |
127 | #endif | |
128 | ||
129 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
130 | struct usb_driver *drv) | |
131 | { | |
132 | struct usb_dynid *dynid; | |
133 | ||
134 | spin_lock(&drv->dynids.lock); | |
135 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
136 | if (usb_match_one_id(intf, &dynid->id)) { | |
137 | spin_unlock(&drv->dynids.lock); | |
138 | return &dynid->id; | |
139 | } | |
140 | } | |
141 | spin_unlock(&drv->dynids.lock); | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | ||
8bb54ab5 AS |
146 | /* called from driver core with dev locked */ |
147 | static int usb_probe_device(struct device *dev) | |
148 | { | |
149 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
150 | struct usb_device *udev; | |
151 | int error = -ENODEV; | |
152 | ||
153 | dev_dbg(dev, "%s\n", __FUNCTION__); | |
154 | ||
155 | if (!is_usb_device(dev)) /* Sanity check */ | |
156 | return error; | |
157 | ||
158 | udev = to_usb_device(dev); | |
159 | ||
160 | /* FIXME: resume a suspended device */ | |
161 | if (udev->state == USB_STATE_SUSPENDED) | |
162 | return -EHOSTUNREACH; | |
163 | ||
164 | /* TODO: Add real matching code */ | |
165 | ||
166 | error = udriver->probe(udev); | |
167 | return error; | |
168 | } | |
169 | ||
170 | /* called from driver core with dev locked */ | |
171 | static int usb_unbind_device(struct device *dev) | |
172 | { | |
173 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
174 | ||
175 | udriver->disconnect(to_usb_device(dev)); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | ||
180 | /* called from driver core with dev locked */ | |
ddae41be GKH |
181 | static int usb_probe_interface(struct device *dev) |
182 | { | |
8bb54ab5 AS |
183 | struct usb_driver *driver = to_usb_driver(dev->driver); |
184 | struct usb_interface *intf; | |
ddae41be GKH |
185 | const struct usb_device_id *id; |
186 | int error = -ENODEV; | |
187 | ||
188 | dev_dbg(dev, "%s\n", __FUNCTION__); | |
189 | ||
8bb54ab5 | 190 | if (is_usb_device(dev)) /* Sanity check */ |
ddae41be | 191 | return error; |
8bb54ab5 AS |
192 | |
193 | intf = to_usb_interface(dev); | |
194 | ||
ddae41be GKH |
195 | /* FIXME we'd much prefer to just resume it ... */ |
196 | if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED) | |
197 | return -EHOSTUNREACH; | |
198 | ||
199 | id = usb_match_id(intf, driver->id_table); | |
733260ff GKH |
200 | if (!id) |
201 | id = usb_match_dynamic_id(intf, driver); | |
ddae41be GKH |
202 | if (id) { |
203 | dev_dbg(dev, "%s - got id\n", __FUNCTION__); | |
204 | ||
205 | /* Interface "power state" doesn't correspond to any hardware | |
206 | * state whatsoever. We use it to record when it's bound to | |
207 | * a driver that may start I/0: it's not frozen/quiesced. | |
208 | */ | |
209 | mark_active(intf); | |
210 | intf->condition = USB_INTERFACE_BINDING; | |
211 | error = driver->probe(intf, id); | |
212 | if (error) { | |
213 | mark_quiesced(intf); | |
214 | intf->condition = USB_INTERFACE_UNBOUND; | |
215 | } else | |
216 | intf->condition = USB_INTERFACE_BOUND; | |
217 | } | |
218 | ||
219 | return error; | |
220 | } | |
221 | ||
8bb54ab5 | 222 | /* called from driver core with dev locked */ |
ddae41be GKH |
223 | static int usb_unbind_interface(struct device *dev) |
224 | { | |
8bb54ab5 | 225 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 226 | struct usb_interface *intf = to_usb_interface(dev); |
ddae41be GKH |
227 | |
228 | intf->condition = USB_INTERFACE_UNBINDING; | |
229 | ||
230 | /* release all urbs for this interface */ | |
231 | usb_disable_interface(interface_to_usbdev(intf), intf); | |
232 | ||
8bb54ab5 | 233 | driver->disconnect(intf); |
ddae41be GKH |
234 | |
235 | /* reset other interface state */ | |
236 | usb_set_interface(interface_to_usbdev(intf), | |
237 | intf->altsetting[0].desc.bInterfaceNumber, | |
238 | 0); | |
239 | usb_set_intfdata(intf, NULL); | |
240 | intf->condition = USB_INTERFACE_UNBOUND; | |
241 | mark_quiesced(intf); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
36e56a34 AS |
246 | /** |
247 | * usb_driver_claim_interface - bind a driver to an interface | |
248 | * @driver: the driver to be bound | |
249 | * @iface: the interface to which it will be bound; must be in the | |
250 | * usb device's active configuration | |
251 | * @priv: driver data associated with that interface | |
252 | * | |
253 | * This is used by usb device drivers that need to claim more than one | |
254 | * interface on a device when probing (audio and acm are current examples). | |
255 | * No device driver should directly modify internal usb_interface or | |
256 | * usb_device structure members. | |
257 | * | |
258 | * Few drivers should need to use this routine, since the most natural | |
259 | * way to bind to an interface is to return the private data from | |
260 | * the driver's probe() method. | |
261 | * | |
262 | * Callers must own the device lock and the driver model's usb_bus_type.subsys | |
263 | * writelock. So driver probe() entries don't need extra locking, | |
264 | * but other call contexts may need to explicitly claim those locks. | |
265 | */ | |
266 | int usb_driver_claim_interface(struct usb_driver *driver, | |
267 | struct usb_interface *iface, void* priv) | |
268 | { | |
269 | struct device *dev = &iface->dev; | |
270 | ||
271 | if (dev->driver) | |
272 | return -EBUSY; | |
273 | ||
8bb54ab5 | 274 | dev->driver = &driver->drvwrap.driver; |
36e56a34 AS |
275 | usb_set_intfdata(iface, priv); |
276 | iface->condition = USB_INTERFACE_BOUND; | |
277 | mark_active(iface); | |
278 | ||
279 | /* if interface was already added, bind now; else let | |
280 | * the future device_add() bind it, bypassing probe() | |
281 | */ | |
282 | if (device_is_registered(dev)) | |
283 | device_bind_driver(dev); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | EXPORT_SYMBOL(usb_driver_claim_interface); | |
288 | ||
289 | /** | |
290 | * usb_driver_release_interface - unbind a driver from an interface | |
291 | * @driver: the driver to be unbound | |
292 | * @iface: the interface from which it will be unbound | |
293 | * | |
294 | * This can be used by drivers to release an interface without waiting | |
295 | * for their disconnect() methods to be called. In typical cases this | |
296 | * also causes the driver disconnect() method to be called. | |
297 | * | |
298 | * This call is synchronous, and may not be used in an interrupt context. | |
299 | * Callers must own the device lock and the driver model's usb_bus_type.subsys | |
300 | * writelock. So driver disconnect() entries don't need extra locking, | |
301 | * but other call contexts may need to explicitly claim those locks. | |
302 | */ | |
303 | void usb_driver_release_interface(struct usb_driver *driver, | |
304 | struct usb_interface *iface) | |
305 | { | |
306 | struct device *dev = &iface->dev; | |
307 | ||
308 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 309 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
310 | return; |
311 | ||
312 | /* don't release from within disconnect() */ | |
313 | if (iface->condition != USB_INTERFACE_BOUND) | |
314 | return; | |
315 | ||
316 | /* don't release if the interface hasn't been added yet */ | |
317 | if (device_is_registered(dev)) { | |
318 | iface->condition = USB_INTERFACE_UNBINDING; | |
319 | device_release_driver(dev); | |
320 | } | |
321 | ||
322 | dev->driver = NULL; | |
323 | usb_set_intfdata(iface, NULL); | |
324 | iface->condition = USB_INTERFACE_UNBOUND; | |
325 | mark_quiesced(iface); | |
326 | } | |
327 | EXPORT_SYMBOL(usb_driver_release_interface); | |
328 | ||
733260ff GKH |
329 | /* returns 0 if no match, 1 if match */ |
330 | static int usb_match_one_id(struct usb_interface *interface, | |
331 | const struct usb_device_id *id) | |
332 | { | |
333 | struct usb_host_interface *intf; | |
334 | struct usb_device *dev; | |
335 | ||
336 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
337 | if (id == NULL) | |
338 | return 0; | |
339 | ||
340 | intf = interface->cur_altsetting; | |
341 | dev = interface_to_usbdev(interface); | |
342 | ||
343 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
344 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
345 | return 0; | |
346 | ||
347 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
348 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
349 | return 0; | |
350 | ||
351 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
352 | greater than any unsigned number. */ | |
353 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
354 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
355 | return 0; | |
356 | ||
357 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
358 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
359 | return 0; | |
360 | ||
361 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
362 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
363 | return 0; | |
364 | ||
365 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
366 | (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) | |
367 | return 0; | |
368 | ||
369 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
370 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
371 | return 0; | |
372 | ||
373 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && | |
374 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
375 | return 0; | |
376 | ||
377 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
378 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
379 | return 0; | |
380 | ||
381 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
382 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
383 | return 0; | |
384 | ||
385 | return 1; | |
386 | } | |
ddae41be GKH |
387 | /** |
388 | * usb_match_id - find first usb_device_id matching device or interface | |
389 | * @interface: the interface of interest | |
390 | * @id: array of usb_device_id structures, terminated by zero entry | |
391 | * | |
392 | * usb_match_id searches an array of usb_device_id's and returns | |
393 | * the first one matching the device or interface, or null. | |
394 | * This is used when binding (or rebinding) a driver to an interface. | |
395 | * Most USB device drivers will use this indirectly, through the usb core, | |
396 | * but some layered driver frameworks use it directly. | |
397 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
398 | * modutils, to support the driver loading functionality of USB hotplugging. | |
399 | * | |
400 | * What Matches: | |
401 | * | |
402 | * The "match_flags" element in a usb_device_id controls which | |
403 | * members are used. If the corresponding bit is set, the | |
404 | * value in the device_id must match its corresponding member | |
405 | * in the device or interface descriptor, or else the device_id | |
406 | * does not match. | |
407 | * | |
408 | * "driver_info" is normally used only by device drivers, | |
409 | * but you can create a wildcard "matches anything" usb_device_id | |
410 | * as a driver's "modules.usbmap" entry if you provide an id with | |
411 | * only a nonzero "driver_info" field. If you do this, the USB device | |
412 | * driver's probe() routine should use additional intelligence to | |
413 | * decide whether to bind to the specified interface. | |
414 | * | |
415 | * What Makes Good usb_device_id Tables: | |
416 | * | |
417 | * The match algorithm is very simple, so that intelligence in | |
418 | * driver selection must come from smart driver id records. | |
419 | * Unless you have good reasons to use another selection policy, | |
420 | * provide match elements only in related groups, and order match | |
421 | * specifiers from specific to general. Use the macros provided | |
422 | * for that purpose if you can. | |
423 | * | |
424 | * The most specific match specifiers use device descriptor | |
425 | * data. These are commonly used with product-specific matches; | |
426 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
427 | * and you can also match against ranges of product revisions. | |
428 | * These are widely used for devices with application or vendor | |
429 | * specific bDeviceClass values. | |
430 | * | |
431 | * Matches based on device class/subclass/protocol specifications | |
432 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
433 | * its siblings. These are used with single-function devices | |
434 | * where bDeviceClass doesn't specify that each interface has | |
435 | * its own class. | |
436 | * | |
437 | * Matches based on interface class/subclass/protocol are the | |
438 | * most general; they let drivers bind to any interface on a | |
439 | * multiple-function device. Use the USB_INTERFACE_INFO | |
440 | * macro, or its siblings, to match class-per-interface style | |
441 | * devices (as recorded in bDeviceClass). | |
442 | * | |
443 | * Within those groups, remember that not all combinations are | |
444 | * meaningful. For example, don't give a product version range | |
445 | * without vendor and product IDs; or specify a protocol without | |
446 | * its associated class and subclass. | |
447 | */ | |
448 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
449 | const struct usb_device_id *id) | |
450 | { | |
ddae41be GKH |
451 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
452 | if (id == NULL) | |
453 | return NULL; | |
454 | ||
ddae41be GKH |
455 | /* It is important to check that id->driver_info is nonzero, |
456 | since an entry that is all zeroes except for a nonzero | |
457 | id->driver_info is the way to create an entry that | |
458 | indicates that the driver want to examine every | |
459 | device and interface. */ | |
460 | for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass || | |
461 | id->driver_info; id++) { | |
733260ff GKH |
462 | if (usb_match_one_id(interface, id)) |
463 | return id; | |
ddae41be GKH |
464 | } |
465 | ||
466 | return NULL; | |
467 | } | |
b87ba0a3 | 468 | EXPORT_SYMBOL_GPL_FUTURE(usb_match_id); |
ddae41be GKH |
469 | |
470 | int usb_device_match(struct device *dev, struct device_driver *drv) | |
471 | { | |
8bb54ab5 AS |
472 | /* devices and interfaces are handled separately */ |
473 | if (is_usb_device(dev)) { | |
ddae41be | 474 | |
8bb54ab5 AS |
475 | /* interface drivers never match devices */ |
476 | if (!is_usb_device_driver(drv)) | |
477 | return 0; | |
ddae41be | 478 | |
8bb54ab5 | 479 | /* TODO: Add real matching code */ |
ddae41be GKH |
480 | return 1; |
481 | ||
8bb54ab5 AS |
482 | } else { |
483 | struct usb_interface *intf; | |
484 | struct usb_driver *usb_drv; | |
485 | const struct usb_device_id *id; | |
486 | ||
487 | /* device drivers never match interfaces */ | |
488 | if (is_usb_device_driver(drv)) | |
489 | return 0; | |
490 | ||
491 | intf = to_usb_interface(dev); | |
492 | usb_drv = to_usb_driver(drv); | |
493 | ||
494 | id = usb_match_id(intf, usb_drv->id_table); | |
495 | if (id) | |
496 | return 1; | |
497 | ||
498 | id = usb_match_dynamic_id(intf, usb_drv); | |
499 | if (id) | |
500 | return 1; | |
501 | } | |
502 | ||
ddae41be GKH |
503 | return 0; |
504 | } | |
505 | ||
36e56a34 AS |
506 | #ifdef CONFIG_HOTPLUG |
507 | ||
508 | /* | |
509 | * This sends an uevent to userspace, typically helping to load driver | |
510 | * or other modules, configure the device, and more. Drivers can provide | |
511 | * a MODULE_DEVICE_TABLE to help with module loading subtasks. | |
512 | * | |
513 | * We're called either from khubd (the typical case) or from root hub | |
514 | * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle | |
515 | * delays in event delivery. Use sysfs (and DEVPATH) to make sure the | |
516 | * device (and this configuration!) are still present. | |
517 | */ | |
518 | static int usb_uevent(struct device *dev, char **envp, int num_envp, | |
519 | char *buffer, int buffer_size) | |
520 | { | |
521 | struct usb_interface *intf; | |
522 | struct usb_device *usb_dev; | |
523 | struct usb_host_interface *alt; | |
524 | int i = 0; | |
525 | int length = 0; | |
526 | ||
527 | if (!dev) | |
528 | return -ENODEV; | |
529 | ||
530 | /* driver is often null here; dev_dbg() would oops */ | |
531 | pr_debug ("usb %s: uevent\n", dev->bus_id); | |
532 | ||
782da727 AS |
533 | if (is_usb_device(dev)) { |
534 | usb_dev = to_usb_device(dev); | |
535 | alt = NULL; | |
536 | } else { | |
8bb54ab5 AS |
537 | intf = to_usb_interface(dev); |
538 | usb_dev = interface_to_usbdev(intf); | |
539 | alt = intf->cur_altsetting; | |
540 | } | |
36e56a34 AS |
541 | |
542 | if (usb_dev->devnum < 0) { | |
543 | pr_debug ("usb %s: already deleted?\n", dev->bus_id); | |
544 | return -ENODEV; | |
545 | } | |
546 | if (!usb_dev->bus) { | |
547 | pr_debug ("usb %s: bus removed?\n", dev->bus_id); | |
548 | return -ENODEV; | |
549 | } | |
550 | ||
551 | #ifdef CONFIG_USB_DEVICEFS | |
552 | /* If this is available, userspace programs can directly read | |
553 | * all the device descriptors we don't tell them about. Or | |
554 | * even act as usermode drivers. | |
555 | * | |
556 | * FIXME reduce hardwired intelligence here | |
557 | */ | |
558 | if (add_uevent_var(envp, num_envp, &i, | |
559 | buffer, buffer_size, &length, | |
560 | "DEVICE=/proc/bus/usb/%03d/%03d", | |
561 | usb_dev->bus->busnum, usb_dev->devnum)) | |
562 | return -ENOMEM; | |
563 | #endif | |
564 | ||
565 | /* per-device configurations are common */ | |
566 | if (add_uevent_var(envp, num_envp, &i, | |
567 | buffer, buffer_size, &length, | |
568 | "PRODUCT=%x/%x/%x", | |
569 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
570 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
571 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
572 | return -ENOMEM; | |
573 | ||
574 | /* class-based driver binding models */ | |
575 | if (add_uevent_var(envp, num_envp, &i, | |
576 | buffer, buffer_size, &length, | |
577 | "TYPE=%d/%d/%d", | |
578 | usb_dev->descriptor.bDeviceClass, | |
579 | usb_dev->descriptor.bDeviceSubClass, | |
580 | usb_dev->descriptor.bDeviceProtocol)) | |
581 | return -ENOMEM; | |
582 | ||
782da727 AS |
583 | if (!is_usb_device(dev)) { |
584 | ||
585 | if (add_uevent_var(envp, num_envp, &i, | |
36e56a34 AS |
586 | buffer, buffer_size, &length, |
587 | "INTERFACE=%d/%d/%d", | |
588 | alt->desc.bInterfaceClass, | |
589 | alt->desc.bInterfaceSubClass, | |
590 | alt->desc.bInterfaceProtocol)) | |
782da727 | 591 | return -ENOMEM; |
36e56a34 | 592 | |
782da727 | 593 | if (add_uevent_var(envp, num_envp, &i, |
36e56a34 AS |
594 | buffer, buffer_size, &length, |
595 | "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X", | |
596 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
597 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
598 | le16_to_cpu(usb_dev->descriptor.bcdDevice), | |
599 | usb_dev->descriptor.bDeviceClass, | |
600 | usb_dev->descriptor.bDeviceSubClass, | |
601 | usb_dev->descriptor.bDeviceProtocol, | |
602 | alt->desc.bInterfaceClass, | |
603 | alt->desc.bInterfaceSubClass, | |
604 | alt->desc.bInterfaceProtocol)) | |
782da727 AS |
605 | return -ENOMEM; |
606 | } | |
36e56a34 AS |
607 | |
608 | envp[i] = NULL; | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | #else | |
614 | ||
615 | static int usb_uevent(struct device *dev, char **envp, | |
616 | int num_envp, char *buffer, int buffer_size) | |
617 | { | |
618 | return -ENODEV; | |
619 | } | |
620 | ||
621 | #endif /* CONFIG_HOTPLUG */ | |
622 | ||
ddae41be | 623 | /** |
8bb54ab5 AS |
624 | * usb_register_device_driver - register a USB device (not interface) driver |
625 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 626 | * @owner: module owner of this driver. |
ddae41be | 627 | * |
8bb54ab5 AS |
628 | * Registers a USB device driver with the USB core. The list of |
629 | * unattached devices will be rescanned whenever a new driver is | |
630 | * added, allowing the new driver to attach to any recognized devices. | |
631 | * Returns a negative error code on failure and 0 on success. | |
632 | */ | |
633 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
634 | struct module *owner) | |
635 | { | |
636 | int retval = 0; | |
637 | ||
638 | if (usb_disabled()) | |
639 | return -ENODEV; | |
640 | ||
641 | new_udriver->drvwrap.for_devices = 1; | |
642 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; | |
643 | new_udriver->drvwrap.driver.bus = &usb_bus_type; | |
644 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
645 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
646 | new_udriver->drvwrap.driver.owner = owner; | |
647 | ||
648 | retval = driver_register(&new_udriver->drvwrap.driver); | |
649 | ||
650 | if (!retval) { | |
651 | pr_info("%s: registered new device driver %s\n", | |
652 | usbcore_name, new_udriver->name); | |
653 | usbfs_update_special(); | |
654 | } else { | |
655 | printk(KERN_ERR "%s: error %d registering device " | |
656 | " driver %s\n", | |
657 | usbcore_name, retval, new_udriver->name); | |
658 | } | |
659 | ||
660 | return retval; | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
663 | ||
664 | /** | |
665 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
666 | * @udriver: USB operations of the device driver to unregister | |
667 | * Context: must be able to sleep | |
668 | * | |
669 | * Unlinks the specified driver from the internal USB driver list. | |
670 | */ | |
671 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
672 | { | |
673 | pr_info("%s: deregistering device driver %s\n", | |
674 | usbcore_name, udriver->name); | |
675 | ||
676 | driver_unregister(&udriver->drvwrap.driver); | |
677 | usbfs_update_special(); | |
678 | } | |
679 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
680 | ||
681 | /** | |
682 | * usb_register_driver - register a USB interface driver | |
683 | * @new_driver: USB operations for the interface driver | |
684 | * @owner: module owner of this driver. | |
685 | * | |
686 | * Registers a USB interface driver with the USB core. The list of | |
687 | * unattached interfaces will be rescanned whenever a new driver is | |
688 | * added, allowing the new driver to attach to any recognized interfaces. | |
ddae41be GKH |
689 | * Returns a negative error code on failure and 0 on success. |
690 | * | |
691 | * NOTE: if you want your driver to use the USB major number, you must call | |
692 | * usb_register_dev() to enable that functionality. This function no longer | |
693 | * takes care of that. | |
694 | */ | |
2143acc6 | 695 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner) |
ddae41be GKH |
696 | { |
697 | int retval = 0; | |
698 | ||
699 | if (usb_disabled()) | |
700 | return -ENODEV; | |
701 | ||
8bb54ab5 AS |
702 | new_driver->drvwrap.for_devices = 0; |
703 | new_driver->drvwrap.driver.name = (char *) new_driver->name; | |
704 | new_driver->drvwrap.driver.bus = &usb_bus_type; | |
705 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
706 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
707 | new_driver->drvwrap.driver.owner = owner; | |
733260ff GKH |
708 | spin_lock_init(&new_driver->dynids.lock); |
709 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 710 | |
8bb54ab5 | 711 | retval = driver_register(&new_driver->drvwrap.driver); |
ddae41be GKH |
712 | |
713 | if (!retval) { | |
8bb54ab5 | 714 | pr_info("%s: registered new interface driver %s\n", |
ddae41be GKH |
715 | usbcore_name, new_driver->name); |
716 | usbfs_update_special(); | |
733260ff | 717 | usb_create_newid_file(new_driver); |
ddae41be | 718 | } else { |
8bb54ab5 AS |
719 | printk(KERN_ERR "%s: error %d registering interface " |
720 | " driver %s\n", | |
ddae41be GKH |
721 | usbcore_name, retval, new_driver->name); |
722 | } | |
723 | ||
724 | return retval; | |
725 | } | |
b87ba0a3 | 726 | EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver); |
ddae41be GKH |
727 | |
728 | /** | |
8bb54ab5 AS |
729 | * usb_deregister - unregister a USB interface driver |
730 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
731 | * Context: must be able to sleep |
732 | * | |
733 | * Unlinks the specified driver from the internal USB driver list. | |
734 | * | |
735 | * NOTE: If you called usb_register_dev(), you still need to call | |
736 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
737 | * this * call will no longer do it for you. | |
738 | */ | |
739 | void usb_deregister(struct usb_driver *driver) | |
740 | { | |
8bb54ab5 AS |
741 | pr_info("%s: deregistering interface driver %s\n", |
742 | usbcore_name, driver->name); | |
ddae41be | 743 | |
ba9dc657 | 744 | usb_remove_newid_file(driver); |
733260ff | 745 | usb_free_dynids(driver); |
8bb54ab5 | 746 | driver_unregister(&driver->drvwrap.driver); |
ddae41be GKH |
747 | |
748 | usbfs_update_special(); | |
749 | } | |
b87ba0a3 | 750 | EXPORT_SYMBOL_GPL_FUTURE(usb_deregister); |
36e56a34 AS |
751 | |
752 | #ifdef CONFIG_PM | |
753 | ||
1cc8a25d AS |
754 | /* Caller has locked udev */ |
755 | static int suspend_device(struct usb_device *udev, pm_message_t msg) | |
36e56a34 | 756 | { |
782da727 | 757 | struct usb_device_driver *udriver; |
2bf4086d | 758 | int status = 0; |
36e56a34 | 759 | |
114b368c AS |
760 | if (udev->state == USB_STATE_NOTATTACHED || |
761 | udev->state == USB_STATE_SUSPENDED) | |
762 | goto done; | |
763 | ||
1cc8a25d | 764 | if (udev->dev.driver == NULL) |
2bf4086d | 765 | goto done; |
1cc8a25d | 766 | udriver = to_usb_device_driver(udev->dev.driver); |
2bf4086d AS |
767 | status = udriver->suspend(udev, msg); |
768 | ||
769 | done: | |
770 | if (status == 0) | |
771 | udev->dev.power.power_state.event = msg.event; | |
772 | return status; | |
1cc8a25d AS |
773 | } |
774 | ||
775 | /* Caller has locked udev */ | |
776 | static int resume_device(struct usb_device *udev) | |
777 | { | |
778 | struct usb_device_driver *udriver; | |
2bf4086d | 779 | int status = 0; |
36e56a34 | 780 | |
114b368c AS |
781 | if (udev->state == USB_STATE_NOTATTACHED || |
782 | udev->state != USB_STATE_SUSPENDED) | |
2bf4086d | 783 | goto done; |
1cc8a25d AS |
784 | |
785 | if (udev->dev.driver == NULL) | |
2bf4086d | 786 | goto done; |
1cc8a25d | 787 | udriver = to_usb_device_driver(udev->dev.driver); |
2bf4086d AS |
788 | status = udriver->resume(udev); |
789 | ||
790 | done: | |
791 | if (status == 0) | |
792 | udev->dev.power.power_state.event = PM_EVENT_ON; | |
793 | return status; | |
1cc8a25d AS |
794 | } |
795 | ||
a8e7c565 | 796 | /* Caller has locked intf's usb_device */ |
1cc8a25d AS |
797 | static int suspend_interface(struct usb_interface *intf, pm_message_t msg) |
798 | { | |
799 | struct usb_driver *driver; | |
2bf4086d | 800 | int status = 0; |
1cc8a25d | 801 | |
114b368c AS |
802 | /* with no hardware, USB interfaces only use FREEZE and ON states */ |
803 | if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED || | |
804 | !is_active(intf)) | |
2bf4086d | 805 | goto done; |
1cc8a25d | 806 | |
114b368c | 807 | if (intf->dev.driver == NULL) |
2bf4086d | 808 | goto done; |
114b368c | 809 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 AS |
810 | |
811 | if (driver->suspend && driver->resume) { | |
1cc8a25d | 812 | status = driver->suspend(intf, msg); |
36e56a34 | 813 | if (status) |
1cc8a25d AS |
814 | dev_err(&intf->dev, "%s error %d\n", |
815 | "suspend", status); | |
36e56a34 AS |
816 | else |
817 | mark_quiesced(intf); | |
818 | } else { | |
819 | // FIXME else if there's no suspend method, disconnect... | |
1cc8a25d AS |
820 | dev_warn(&intf->dev, "no suspend for driver %s?\n", |
821 | driver->name); | |
36e56a34 | 822 | mark_quiesced(intf); |
36e56a34 | 823 | } |
2bf4086d AS |
824 | |
825 | done: | |
826 | if (status == 0) | |
827 | intf->dev.power.power_state.event = msg.event; | |
36e56a34 AS |
828 | return status; |
829 | } | |
830 | ||
a8e7c565 | 831 | /* Caller has locked intf's usb_device */ |
1cc8a25d | 832 | static int resume_interface(struct usb_interface *intf) |
36e56a34 | 833 | { |
1cc8a25d | 834 | struct usb_driver *driver; |
2bf4086d | 835 | int status = 0; |
36e56a34 | 836 | |
114b368c AS |
837 | if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED || |
838 | is_active(intf)) | |
2bf4086d | 839 | goto done; |
36e56a34 | 840 | |
2bf4086d AS |
841 | if (intf->dev.driver == NULL) |
842 | goto done; | |
1cc8a25d | 843 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 844 | |
36e56a34 AS |
845 | if (driver->resume) { |
846 | status = driver->resume(intf); | |
2bf4086d | 847 | if (status) |
1cc8a25d AS |
848 | dev_err(&intf->dev, "%s error %d\n", |
849 | "resume", status); | |
2bf4086d AS |
850 | else |
851 | mark_active(intf); | |
852 | } else { | |
1cc8a25d AS |
853 | dev_warn(&intf->dev, "no resume for driver %s?\n", |
854 | driver->name); | |
2bf4086d AS |
855 | mark_active(intf); |
856 | } | |
857 | ||
858 | done: | |
859 | if (status == 0) | |
860 | intf->dev.power.power_state.event = PM_EVENT_ON; | |
861 | return status; | |
36e56a34 AS |
862 | } |
863 | ||
a8e7c565 AS |
864 | /* Caller has locked udev */ |
865 | int usb_suspend_both(struct usb_device *udev, pm_message_t msg) | |
866 | { | |
867 | int status = 0; | |
868 | int i = 0; | |
869 | struct usb_interface *intf; | |
870 | ||
871 | if (udev->actconfig) { | |
872 | for (; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
873 | intf = udev->actconfig->interface[i]; | |
874 | status = suspend_interface(intf, msg); | |
875 | if (status != 0) | |
876 | break; | |
877 | } | |
878 | } | |
879 | if (status == 0) | |
880 | status = suspend_device(udev, msg); | |
881 | ||
882 | /* If the suspend failed, resume interfaces that did get suspended */ | |
883 | if (status != 0) { | |
884 | while (--i >= 0) { | |
885 | intf = udev->actconfig->interface[i]; | |
886 | resume_interface(intf); | |
887 | } | |
888 | } | |
889 | return status; | |
890 | } | |
891 | ||
892 | /* Caller has locked udev */ | |
893 | int usb_resume_both(struct usb_device *udev) | |
894 | { | |
895 | int status; | |
896 | int i; | |
897 | struct usb_interface *intf; | |
898 | ||
114b368c AS |
899 | /* Can't resume if the parent is suspended */ |
900 | if (udev->parent && udev->parent->state == USB_STATE_SUSPENDED) { | |
901 | dev_warn(&udev->dev, "can't resume; parent is suspended\n"); | |
902 | return -EHOSTUNREACH; | |
903 | } | |
904 | ||
a8e7c565 AS |
905 | status = resume_device(udev); |
906 | if (status == 0 && udev->actconfig) { | |
907 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
908 | intf = udev->actconfig->interface[i]; | |
909 | resume_interface(intf); | |
910 | } | |
911 | } | |
912 | return status; | |
913 | } | |
914 | ||
1cc8a25d AS |
915 | static int usb_suspend(struct device *dev, pm_message_t message) |
916 | { | |
917 | int status; | |
918 | ||
919 | if (is_usb_device(dev)) | |
a8e7c565 | 920 | status = usb_suspend_both(to_usb_device(dev), message); |
1cc8a25d | 921 | else |
a8e7c565 | 922 | status = 0; |
1cc8a25d AS |
923 | return status; |
924 | } | |
925 | ||
926 | static int usb_resume(struct device *dev) | |
927 | { | |
928 | int status; | |
929 | ||
a8e7c565 AS |
930 | if (is_usb_device(dev)) { |
931 | status = usb_resume_both(to_usb_device(dev)); | |
932 | ||
933 | /* Rebind drivers that had no suspend method? */ | |
934 | } else | |
935 | status = 0; | |
1cc8a25d AS |
936 | return status; |
937 | } | |
938 | ||
36e56a34 AS |
939 | #endif /* CONFIG_PM */ |
940 | ||
941 | struct bus_type usb_bus_type = { | |
942 | .name = "usb", | |
943 | .match = usb_device_match, | |
944 | .uevent = usb_uevent, | |
945 | #ifdef CONFIG_PM | |
782da727 AS |
946 | .suspend = usb_suspend, |
947 | .resume = usb_resume, | |
36e56a34 AS |
948 | #endif |
949 | }; |