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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * drivers/usb/core/usb.c |
1da177e4 LT |
3 | * |
4 | * (C) Copyright Linus Torvalds 1999 | |
5 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
6 | * (C) Copyright Andreas Gal 1999 | |
7 | * (C) Copyright Gregory P. Smith 1999 | |
8 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) | |
9 | * (C) Copyright Randy Dunlap 2000 | |
10 | * (C) Copyright David Brownell 2000-2004 | |
11 | * (C) Copyright Yggdrasil Computing, Inc. 2000 | |
12 | * (usb_device_id matching changes by Adam J. Richter) | |
13 | * (C) Copyright Greg Kroah-Hartman 2002-2003 | |
14 | * | |
15 | * NOTE! This is not actually a driver at all, rather this is | |
16 | * just a collection of helper routines that implement the | |
17 | * generic USB things that the real drivers can use.. | |
18 | * | |
19 | * Think of this as a "USB library" rather than anything else. | |
20 | * It should be considered a slave, with no callbacks. Callbacks | |
21 | * are evil. | |
22 | */ | |
23 | ||
1da177e4 | 24 | #include <linux/module.h> |
b5e795f8 | 25 | #include <linux/moduleparam.h> |
1da177e4 LT |
26 | #include <linux/string.h> |
27 | #include <linux/bitops.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/interrupt.h> /* for in_interrupt() */ | |
30 | #include <linux/kmod.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/errno.h> | |
1da177e4 | 34 | #include <linux/usb.h> |
4186ecf8 | 35 | #include <linux/mutex.h> |
bd859281 | 36 | #include <linux/workqueue.h> |
00048b8b | 37 | #include <linux/debugfs.h> |
1da177e4 LT |
38 | |
39 | #include <asm/io.h> | |
87ae9afd | 40 | #include <linux/scatterlist.h> |
1da177e4 LT |
41 | #include <linux/mm.h> |
42 | #include <linux/dma-mapping.h> | |
43 | ||
44 | #include "hcd.h" | |
45 | #include "usb.h" | |
46 | ||
1da177e4 LT |
47 | |
48 | const char *usbcore_name = "usbcore"; | |
49 | ||
50 | static int nousb; /* Disable USB when built into kernel image */ | |
1da177e4 | 51 | |
6b157c9b AS |
52 | /* Workqueue for autosuspend and for remote wakeup of root hubs */ |
53 | struct workqueue_struct *ksuspend_usb_wq; | |
bd859281 | 54 | |
b5e795f8 AS |
55 | #ifdef CONFIG_USB_SUSPEND |
56 | static int usb_autosuspend_delay = 2; /* Default delay value, | |
57 | * in seconds */ | |
eaafbc3a | 58 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
59 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
60 | ||
61 | #else | |
62 | #define usb_autosuspend_delay 0 | |
63 | #endif | |
64 | ||
1da177e4 | 65 | |
1da177e4 LT |
66 | /** |
67 | * usb_ifnum_to_if - get the interface object with a given interface number | |
68 | * @dev: the device whose current configuration is considered | |
69 | * @ifnum: the desired interface | |
70 | * | |
71 | * This walks the device descriptor for the currently active configuration | |
72 | * and returns a pointer to the interface with that particular interface | |
73 | * number, or null. | |
74 | * | |
75 | * Note that configuration descriptors are not required to assign interface | |
76 | * numbers sequentially, so that it would be incorrect to assume that | |
77 | * the first interface in that descriptor corresponds to interface zero. | |
78 | * This routine helps device drivers avoid such mistakes. | |
79 | * However, you should make sure that you do the right thing with any | |
80 | * alternate settings available for this interfaces. | |
81 | * | |
82 | * Don't call this function unless you are bound to one of the interfaces | |
83 | * on this device or you have locked the device! | |
84 | */ | |
095bc335 LFC |
85 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
86 | unsigned ifnum) | |
1da177e4 LT |
87 | { |
88 | struct usb_host_config *config = dev->actconfig; | |
89 | int i; | |
90 | ||
91 | if (!config) | |
92 | return NULL; | |
93 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
94 | if (config->interface[i]->altsetting[0] | |
95 | .desc.bInterfaceNumber == ifnum) | |
96 | return config->interface[i]; | |
97 | ||
98 | return NULL; | |
99 | } | |
782e70c6 | 100 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
101 | |
102 | /** | |
d0bcabcd | 103 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
104 | * @intf: the interface containing the altsetting in question |
105 | * @altnum: the desired alternate setting number | |
106 | * | |
107 | * This searches the altsetting array of the specified interface for | |
108 | * an entry with the correct bAlternateSetting value and returns a pointer | |
109 | * to that entry, or null. | |
110 | * | |
111 | * Note that altsettings need not be stored sequentially by number, so | |
112 | * it would be incorrect to assume that the first altsetting entry in | |
113 | * the array corresponds to altsetting zero. This routine helps device | |
114 | * drivers avoid such mistakes. | |
115 | * | |
116 | * Don't call this function unless you are bound to the intf interface | |
117 | * or you have locked the device! | |
118 | */ | |
2c044a48 GKH |
119 | struct usb_host_interface *usb_altnum_to_altsetting( |
120 | const struct usb_interface *intf, | |
121 | unsigned int altnum) | |
1da177e4 LT |
122 | { |
123 | int i; | |
124 | ||
125 | for (i = 0; i < intf->num_altsetting; i++) { | |
126 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
127 | return &intf->altsetting[i]; | |
128 | } | |
129 | return NULL; | |
130 | } | |
782e70c6 | 131 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 132 | |
f5691d70 PZ |
133 | struct find_interface_arg { |
134 | int minor; | |
135 | struct usb_interface *interface; | |
136 | }; | |
1da177e4 | 137 | |
2c044a48 | 138 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 139 | { |
f5691d70 PZ |
140 | struct find_interface_arg *arg = data; |
141 | struct usb_interface *intf; | |
6034a080 | 142 | |
55129666 | 143 | if (!is_usb_interface(dev)) |
6034a080 PM |
144 | return 0; |
145 | ||
146 | intf = to_usb_interface(dev); | |
f5691d70 PZ |
147 | if (intf->minor != -1 && intf->minor == arg->minor) { |
148 | arg->interface = intf; | |
6034a080 PM |
149 | return 1; |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
1da177e4 LT |
154 | /** |
155 | * usb_find_interface - find usb_interface pointer for driver and device | |
156 | * @drv: the driver whose current configuration is considered | |
157 | * @minor: the minor number of the desired device | |
158 | * | |
2c044a48 | 159 | * This walks the driver device list and returns a pointer to the interface |
1da177e4 LT |
160 | * with the matching minor. Note, this only works for devices that share the |
161 | * USB major number. | |
162 | */ | |
163 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
164 | { | |
f5691d70 | 165 | struct find_interface_arg argb; |
1b21d5e1 | 166 | int retval; |
1da177e4 | 167 | |
f5691d70 PZ |
168 | argb.minor = minor; |
169 | argb.interface = NULL; | |
1b21d5e1 GKH |
170 | /* eat the error, it will be in argb.interface */ |
171 | retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb, | |
172 | __find_interface); | |
f5691d70 | 173 | return argb.interface; |
1da177e4 | 174 | } |
782e70c6 | 175 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 176 | |
1da177e4 LT |
177 | /** |
178 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
179 | * @dev: device that's been disconnected | |
180 | * | |
181 | * Will be called only by the device core when all users of this usb device are | |
182 | * done. | |
183 | */ | |
184 | static void usb_release_dev(struct device *dev) | |
185 | { | |
186 | struct usb_device *udev; | |
c6515272 | 187 | struct usb_hcd *hcd; |
1da177e4 LT |
188 | |
189 | udev = to_usb_device(dev); | |
c6515272 | 190 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
191 | |
192 | usb_destroy_configuration(udev); | |
c6515272 SS |
193 | /* Root hubs aren't real devices, so don't free HCD resources */ |
194 | if (hcd->driver->free_dev && udev->parent) | |
195 | hcd->driver->free_dev(hcd, udev); | |
196 | usb_put_hcd(hcd); | |
1da177e4 LT |
197 | kfree(udev->product); |
198 | kfree(udev->manufacturer); | |
199 | kfree(udev->serial); | |
200 | kfree(udev); | |
201 | } | |
202 | ||
4a9bee82 AS |
203 | #ifdef CONFIG_HOTPLUG |
204 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
205 | { | |
206 | struct usb_device *usb_dev; | |
207 | ||
208 | usb_dev = to_usb_device(dev); | |
209 | ||
210 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
214 | return -ENOMEM; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | #else | |
220 | ||
221 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
222 | { | |
223 | return -ENODEV; | |
224 | } | |
225 | #endif /* CONFIG_HOTPLUG */ | |
226 | ||
645daaab AS |
227 | #ifdef CONFIG_PM |
228 | ||
bd859281 AS |
229 | static int ksuspend_usb_init(void) |
230 | { | |
7ed92f1a AS |
231 | /* This workqueue is supposed to be both freezable and |
232 | * singlethreaded. Its job doesn't justify running on more | |
233 | * than one CPU. | |
234 | */ | |
7a8d37a3 | 235 | ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd"); |
bd859281 AS |
236 | if (!ksuspend_usb_wq) |
237 | return -ENOMEM; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static void ksuspend_usb_cleanup(void) | |
242 | { | |
243 | destroy_workqueue(ksuspend_usb_wq); | |
244 | } | |
245 | ||
f2189c47 AS |
246 | /* USB device Power-Management thunks. |
247 | * There's no need to distinguish here between quiescing a USB device | |
248 | * and powering it down; the generic_suspend() routine takes care of | |
249 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
250 | * USB interfaces there's no difference at all. | |
251 | */ | |
252 | ||
253 | static int usb_dev_prepare(struct device *dev) | |
254 | { | |
255 | return 0; /* Implement eventually? */ | |
256 | } | |
257 | ||
258 | static void usb_dev_complete(struct device *dev) | |
259 | { | |
260 | /* Currently used only for rebinding interfaces */ | |
65bfd296 | 261 | usb_resume(dev, PMSG_RESUME); /* Message event is meaningless */ |
f2189c47 AS |
262 | } |
263 | ||
264 | static int usb_dev_suspend(struct device *dev) | |
265 | { | |
266 | return usb_suspend(dev, PMSG_SUSPEND); | |
267 | } | |
268 | ||
269 | static int usb_dev_resume(struct device *dev) | |
270 | { | |
65bfd296 | 271 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
272 | } |
273 | ||
274 | static int usb_dev_freeze(struct device *dev) | |
275 | { | |
276 | return usb_suspend(dev, PMSG_FREEZE); | |
277 | } | |
278 | ||
279 | static int usb_dev_thaw(struct device *dev) | |
280 | { | |
65bfd296 | 281 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
282 | } |
283 | ||
284 | static int usb_dev_poweroff(struct device *dev) | |
285 | { | |
286 | return usb_suspend(dev, PMSG_HIBERNATE); | |
287 | } | |
288 | ||
289 | static int usb_dev_restore(struct device *dev) | |
290 | { | |
65bfd296 | 291 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
292 | } |
293 | ||
adf09493 | 294 | static struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
295 | .prepare = usb_dev_prepare, |
296 | .complete = usb_dev_complete, | |
297 | .suspend = usb_dev_suspend, | |
298 | .resume = usb_dev_resume, | |
299 | .freeze = usb_dev_freeze, | |
300 | .thaw = usb_dev_thaw, | |
301 | .poweroff = usb_dev_poweroff, | |
302 | .restore = usb_dev_restore, | |
303 | }; | |
304 | ||
db063507 AS |
305 | #else |
306 | ||
307 | #define ksuspend_usb_init() 0 | |
308 | #define ksuspend_usb_cleanup() do {} while (0) | |
adf09493 | 309 | #define usb_device_pm_ops (*(struct dev_pm_ops *)0) |
db063507 AS |
310 | |
311 | #endif /* CONFIG_PM */ | |
645daaab | 312 | |
f7a386c5 | 313 | |
e454cea2 | 314 | static char *usb_devnode(struct device *dev, mode_t *mode) |
f7a386c5 KS |
315 | { |
316 | struct usb_device *usb_dev; | |
317 | ||
318 | usb_dev = to_usb_device(dev); | |
319 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
320 | usb_dev->bus->busnum, usb_dev->devnum); | |
321 | } | |
322 | ||
f2189c47 AS |
323 | struct device_type usb_device_type = { |
324 | .name = "usb_device", | |
325 | .release = usb_release_dev, | |
326 | .uevent = usb_dev_uevent, | |
e454cea2 | 327 | .devnode = usb_devnode, |
f2189c47 AS |
328 | .pm = &usb_device_pm_ops, |
329 | }; | |
330 | ||
d7d07255 IPG |
331 | |
332 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
333 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
334 | { | |
335 | struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); | |
336 | return hcd->wireless; | |
337 | } | |
338 | ||
339 | ||
1da177e4 LT |
340 | /** |
341 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
342 | * @parent: hub to which device is connected; null to allocate a root hub | |
343 | * @bus: bus used to access the device | |
344 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 345 | * Context: !in_interrupt() |
1da177e4 LT |
346 | * |
347 | * Only hub drivers (including virtual root hub drivers for host | |
348 | * controllers) should ever call this. | |
349 | * | |
350 | * This call may not be used in a non-sleeping context. | |
351 | */ | |
2c044a48 GKH |
352 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
353 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
354 | { |
355 | struct usb_device *dev; | |
d7d07255 IPG |
356 | struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); |
357 | unsigned root_hub = 0; | |
1da177e4 | 358 | |
0a1ef3b5 | 359 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
360 | if (!dev) |
361 | return NULL; | |
362 | ||
17200583 | 363 | if (!usb_get_hcd(bus_to_hcd(bus))) { |
1da177e4 LT |
364 | kfree(dev); |
365 | return NULL; | |
366 | } | |
c6515272 SS |
367 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
368 | if (usb_hcd->driver->alloc_dev && parent && | |
369 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
370 | usb_put_hcd(bus_to_hcd(bus)); | |
371 | kfree(dev); | |
372 | return NULL; | |
373 | } | |
1da177e4 LT |
374 | |
375 | device_initialize(&dev->dev); | |
376 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 377 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 378 | dev->dev.groups = usb_device_groups; |
1da177e4 | 379 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 380 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 381 | dev->state = USB_STATE_ATTACHED; |
4d59d8a1 | 382 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
383 | |
384 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
385 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
386 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
387 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 388 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 389 | dev->can_submit = 1; |
1da177e4 LT |
390 | |
391 | /* Save readable and stable topology id, distinguishing devices | |
392 | * by location for diagnostics, tools, driver model, etc. The | |
393 | * string is a path along hub ports, from the root. Each device's | |
394 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 395 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
396 | * as stable: bus->busnum changes easily from modprobe order, |
397 | * cardbus or pci hotplugging, and so on. | |
398 | */ | |
9251644a ON |
399 | if (unlikely(!parent)) { |
400 | dev->devpath[0] = '0'; | |
7206b001 | 401 | dev->route = 0; |
1da177e4 LT |
402 | |
403 | dev->dev.parent = bus->controller; | |
0031a06e | 404 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 405 | root_hub = 1; |
1da177e4 LT |
406 | } else { |
407 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 408 | if (parent->devpath[0] == '0') { |
9251644a | 409 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 410 | "%d", port1); |
7206b001 SS |
411 | /* Root ports are not counted in route string */ |
412 | dev->route = 0; | |
413 | } else { | |
9251644a | 414 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 415 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
416 | /* Route string assumes hubs have less than 16 ports */ |
417 | if (port1 < 15) | |
418 | dev->route = parent->route + | |
419 | (port1 << ((parent->level - 1)*4)); | |
420 | else | |
421 | dev->route = parent->route + | |
422 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 423 | } |
1da177e4 LT |
424 | |
425 | dev->dev.parent = &parent->dev; | |
0031a06e | 426 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 LT |
427 | |
428 | /* hub driver sets up TT records */ | |
429 | } | |
430 | ||
12c3da34 | 431 | dev->portnum = port1; |
1da177e4 LT |
432 | dev->bus = bus; |
433 | dev->parent = parent; | |
434 | INIT_LIST_HEAD(&dev->filelist); | |
435 | ||
645daaab AS |
436 | #ifdef CONFIG_PM |
437 | mutex_init(&dev->pm_mutex); | |
c4028958 | 438 | INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); |
9ac39f28 | 439 | INIT_WORK(&dev->autoresume, usb_autoresume_work); |
b5e795f8 | 440 | dev->autosuspend_delay = usb_autosuspend_delay * HZ; |
15123006 SS |
441 | dev->connect_time = jiffies; |
442 | dev->active_duration = -jiffies; | |
645daaab | 443 | #endif |
d7d07255 IPG |
444 | if (root_hub) /* Root hub always ok [and always wired] */ |
445 | dev->authorized = 1; | |
446 | else { | |
447 | dev->authorized = usb_hcd->authorized_default; | |
448 | dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; | |
449 | } | |
1da177e4 LT |
450 | return dev; |
451 | } | |
452 | ||
453 | /** | |
454 | * usb_get_dev - increments the reference count of the usb device structure | |
455 | * @dev: the device being referenced | |
456 | * | |
457 | * Each live reference to a device should be refcounted. | |
458 | * | |
459 | * Drivers for USB interfaces should normally record such references in | |
460 | * their probe() methods, when they bind to an interface, and release | |
461 | * them by calling usb_put_dev(), in their disconnect() methods. | |
462 | * | |
463 | * A pointer to the device with the incremented reference counter is returned. | |
464 | */ | |
465 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
466 | { | |
467 | if (dev) | |
468 | get_device(&dev->dev); | |
469 | return dev; | |
470 | } | |
782e70c6 | 471 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
472 | |
473 | /** | |
474 | * usb_put_dev - release a use of the usb device structure | |
475 | * @dev: device that's been disconnected | |
476 | * | |
477 | * Must be called when a user of a device is finished with it. When the last | |
478 | * user of the device calls this function, the memory of the device is freed. | |
479 | */ | |
480 | void usb_put_dev(struct usb_device *dev) | |
481 | { | |
482 | if (dev) | |
483 | put_device(&dev->dev); | |
484 | } | |
782e70c6 | 485 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
486 | |
487 | /** | |
488 | * usb_get_intf - increments the reference count of the usb interface structure | |
489 | * @intf: the interface being referenced | |
490 | * | |
491 | * Each live reference to a interface must be refcounted. | |
492 | * | |
493 | * Drivers for USB interfaces should normally record such references in | |
494 | * their probe() methods, when they bind to an interface, and release | |
495 | * them by calling usb_put_intf(), in their disconnect() methods. | |
496 | * | |
497 | * A pointer to the interface with the incremented reference counter is | |
498 | * returned. | |
499 | */ | |
500 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
501 | { | |
502 | if (intf) | |
503 | get_device(&intf->dev); | |
504 | return intf; | |
505 | } | |
782e70c6 | 506 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
507 | |
508 | /** | |
509 | * usb_put_intf - release a use of the usb interface structure | |
510 | * @intf: interface that's been decremented | |
511 | * | |
512 | * Must be called when a user of an interface is finished with it. When the | |
513 | * last user of the interface calls this function, the memory of the interface | |
514 | * is freed. | |
515 | */ | |
516 | void usb_put_intf(struct usb_interface *intf) | |
517 | { | |
518 | if (intf) | |
519 | put_device(&intf->dev); | |
520 | } | |
782e70c6 | 521 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
522 | |
523 | /* USB device locking | |
524 | * | |
9ad3d6cc AS |
525 | * USB devices and interfaces are locked using the semaphore in their |
526 | * embedded struct device. The hub driver guarantees that whenever a | |
527 | * device is connected or disconnected, drivers are called with the | |
528 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
529 | * |
530 | * Complications arise when several devices are to be locked at the same | |
531 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
532 | * do this; nobody else needs to worry about it. The rule for locking |
533 | * is simple: | |
1da177e4 LT |
534 | * |
535 | * When locking both a device and its parent, always lock the | |
536 | * the parent first. | |
537 | */ | |
538 | ||
1da177e4 | 539 | /** |
d0bcabcd | 540 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
541 | * @udev: device that's being locked |
542 | * @iface: interface bound to the driver making the request (optional) | |
543 | * | |
544 | * Attempts to acquire the device lock, but fails if the device is | |
545 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
546 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
547 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
548 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 549 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 550 | * |
011b15df | 551 | * Returns a negative error code for failure, otherwise 0. |
1da177e4 LT |
552 | */ |
553 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 554 | const struct usb_interface *iface) |
1da177e4 | 555 | { |
3ea15966 AS |
556 | unsigned long jiffies_expire = jiffies + HZ; |
557 | ||
1da177e4 LT |
558 | if (udev->state == USB_STATE_NOTATTACHED) |
559 | return -ENODEV; | |
560 | if (udev->state == USB_STATE_SUSPENDED) | |
561 | return -EHOSTUNREACH; | |
011b15df AS |
562 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
563 | iface->condition == USB_INTERFACE_UNBOUND)) | |
564 | return -EINTR; | |
1da177e4 | 565 | |
9ad3d6cc | 566 | while (usb_trylock_device(udev) != 0) { |
3ea15966 AS |
567 | |
568 | /* If we can't acquire the lock after waiting one second, | |
569 | * we're probably deadlocked */ | |
570 | if (time_after(jiffies, jiffies_expire)) | |
571 | return -EBUSY; | |
572 | ||
1da177e4 LT |
573 | msleep(15); |
574 | if (udev->state == USB_STATE_NOTATTACHED) | |
575 | return -ENODEV; | |
576 | if (udev->state == USB_STATE_SUSPENDED) | |
577 | return -EHOSTUNREACH; | |
011b15df AS |
578 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
579 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
580 | return -EINTR; |
581 | } | |
011b15df | 582 | return 0; |
1da177e4 | 583 | } |
782e70c6 | 584 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 LT |
585 | |
586 | static struct usb_device *match_device(struct usb_device *dev, | |
587 | u16 vendor_id, u16 product_id) | |
588 | { | |
589 | struct usb_device *ret_dev = NULL; | |
590 | int child; | |
591 | ||
592 | dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", | |
593 | le16_to_cpu(dev->descriptor.idVendor), | |
594 | le16_to_cpu(dev->descriptor.idProduct)); | |
595 | ||
596 | /* see if this device matches */ | |
597 | if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && | |
598 | (product_id == le16_to_cpu(dev->descriptor.idProduct))) { | |
9251644a | 599 | dev_dbg(&dev->dev, "matched this device!\n"); |
1da177e4 LT |
600 | ret_dev = usb_get_dev(dev); |
601 | goto exit; | |
602 | } | |
603 | ||
604 | /* look through all of the children of this device */ | |
605 | for (child = 0; child < dev->maxchild; ++child) { | |
606 | if (dev->children[child]) { | |
9ad3d6cc | 607 | usb_lock_device(dev->children[child]); |
1da177e4 LT |
608 | ret_dev = match_device(dev->children[child], |
609 | vendor_id, product_id); | |
9ad3d6cc | 610 | usb_unlock_device(dev->children[child]); |
1da177e4 LT |
611 | if (ret_dev) |
612 | goto exit; | |
613 | } | |
614 | } | |
615 | exit: | |
616 | return ret_dev; | |
617 | } | |
618 | ||
619 | /** | |
620 | * usb_find_device - find a specific usb device in the system | |
621 | * @vendor_id: the vendor id of the device to find | |
622 | * @product_id: the product id of the device to find | |
623 | * | |
624 | * Returns a pointer to a struct usb_device if such a specified usb | |
625 | * device is present in the system currently. The usage count of the | |
626 | * device will be incremented if a device is found. Make sure to call | |
627 | * usb_put_dev() when the caller is finished with the device. | |
628 | * | |
629 | * If a device with the specified vendor and product id is not found, | |
630 | * NULL is returned. | |
631 | */ | |
632 | struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) | |
633 | { | |
634 | struct list_head *buslist; | |
635 | struct usb_bus *bus; | |
636 | struct usb_device *dev = NULL; | |
2c044a48 | 637 | |
4186ecf8 | 638 | mutex_lock(&usb_bus_list_lock); |
1da177e4 | 639 | for (buslist = usb_bus_list.next; |
2c044a48 | 640 | buslist != &usb_bus_list; |
1da177e4 LT |
641 | buslist = buslist->next) { |
642 | bus = container_of(buslist, struct usb_bus, bus_list); | |
643 | if (!bus->root_hub) | |
644 | continue; | |
645 | usb_lock_device(bus->root_hub); | |
646 | dev = match_device(bus->root_hub, vendor_id, product_id); | |
647 | usb_unlock_device(bus->root_hub); | |
648 | if (dev) | |
649 | goto exit; | |
650 | } | |
651 | exit: | |
4186ecf8 | 652 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
653 | return dev; |
654 | } | |
655 | ||
656 | /** | |
657 | * usb_get_current_frame_number - return current bus frame number | |
658 | * @dev: the device whose bus is being queried | |
659 | * | |
660 | * Returns the current frame number for the USB host controller | |
661 | * used with the given USB device. This can be used when scheduling | |
662 | * isochronous requests. | |
663 | * | |
664 | * Note that different kinds of host controller have different | |
665 | * "scheduling horizons". While one type might support scheduling only | |
666 | * 32 frames into the future, others could support scheduling up to | |
667 | * 1024 frames into the future. | |
668 | */ | |
669 | int usb_get_current_frame_number(struct usb_device *dev) | |
670 | { | |
9251644a | 671 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 672 | } |
782e70c6 | 673 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
674 | |
675 | /*-------------------------------------------------------------------*/ | |
676 | /* | |
677 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
678 | * extra field of the interface and endpoint descriptor structs. | |
679 | */ | |
680 | ||
681 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 682 | unsigned char type, void **ptr) |
1da177e4 LT |
683 | { |
684 | struct usb_descriptor_header *header; | |
685 | ||
686 | while (size >= sizeof(struct usb_descriptor_header)) { | |
687 | header = (struct usb_descriptor_header *)buffer; | |
688 | ||
689 | if (header->bLength < 2) { | |
690 | printk(KERN_ERR | |
691 | "%s: bogus descriptor, type %d length %d\n", | |
692 | usbcore_name, | |
2c044a48 | 693 | header->bDescriptorType, |
1da177e4 LT |
694 | header->bLength); |
695 | return -1; | |
696 | } | |
697 | ||
698 | if (header->bDescriptorType == type) { | |
699 | *ptr = header; | |
700 | return 0; | |
701 | } | |
702 | ||
703 | buffer += header->bLength; | |
704 | size -= header->bLength; | |
705 | } | |
706 | return -1; | |
707 | } | |
782e70c6 | 708 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
709 | |
710 | /** | |
711 | * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP | |
712 | * @dev: device the buffer will be used with | |
713 | * @size: requested buffer size | |
714 | * @mem_flags: affect whether allocation may block | |
715 | * @dma: used to return DMA address of buffer | |
716 | * | |
717 | * Return value is either null (indicating no buffer could be allocated), or | |
718 | * the cpu-space pointer to a buffer that may be used to perform DMA to the | |
719 | * specified device. Such cpu-space buffers are returned along with the DMA | |
720 | * address (through the pointer provided). | |
721 | * | |
722 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags | |
fbf54dd3 DB |
723 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
724 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 725 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
726 | * Using these buffers also eliminates cacheline sharing problems on |
727 | * architectures where CPU caches are not DMA-coherent. On systems without | |
728 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 LT |
729 | * |
730 | * When the buffer is no longer used, free it with usb_buffer_free(). | |
731 | */ | |
2c044a48 GKH |
732 | void *usb_buffer_alloc(struct usb_device *dev, size_t size, gfp_t mem_flags, |
733 | dma_addr_t *dma) | |
1da177e4 | 734 | { |
a6d2bb9f | 735 | if (!dev || !dev->bus) |
1da177e4 | 736 | return NULL; |
9251644a | 737 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 738 | } |
782e70c6 | 739 | EXPORT_SYMBOL_GPL(usb_buffer_alloc); |
1da177e4 LT |
740 | |
741 | /** | |
742 | * usb_buffer_free - free memory allocated with usb_buffer_alloc() | |
743 | * @dev: device the buffer was used with | |
744 | * @size: requested buffer size | |
745 | * @addr: CPU address of buffer | |
746 | * @dma: DMA address of buffer | |
747 | * | |
748 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
749 | * been allocated using usb_buffer_alloc(), and the parameters must match | |
fbf54dd3 | 750 | * those provided in that allocation request. |
1da177e4 | 751 | */ |
2c044a48 GKH |
752 | void usb_buffer_free(struct usb_device *dev, size_t size, void *addr, |
753 | dma_addr_t dma) | |
1da177e4 | 754 | { |
a6d2bb9f | 755 | if (!dev || !dev->bus) |
b94badbb DT |
756 | return; |
757 | if (!addr) | |
758 | return; | |
9251644a | 759 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 760 | } |
782e70c6 | 761 | EXPORT_SYMBOL_GPL(usb_buffer_free); |
1da177e4 LT |
762 | |
763 | /** | |
764 | * usb_buffer_map - create DMA mapping(s) for an urb | |
765 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
766 | * | |
767 | * Return value is either null (indicating no buffer could be mapped), or | |
768 | * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are | |
769 | * added to urb->transfer_flags if the operation succeeds. If the device | |
770 | * is connected to this system through a non-DMA controller, this operation | |
771 | * always succeeds. | |
772 | * | |
773 | * This call would normally be used for an urb which is reused, perhaps | |
774 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
775 | * calls to synchronize memory and dma state. | |
776 | * | |
777 | * Reverse the effect of this call with usb_buffer_unmap(). | |
778 | */ | |
779 | #if 0 | |
9251644a | 780 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
781 | { |
782 | struct usb_bus *bus; | |
783 | struct device *controller; | |
784 | ||
785 | if (!urb | |
786 | || !urb->dev | |
787 | || !(bus = urb->dev->bus) | |
788 | || !(controller = bus->controller)) | |
789 | return NULL; | |
790 | ||
791 | if (controller->dma_mask) { | |
9251644a | 792 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 793 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 794 | usb_pipein(urb->pipe) |
1da177e4 | 795 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
796 | if (usb_pipecontrol(urb->pipe)) |
797 | urb->setup_dma = dma_map_single(controller, | |
1da177e4 | 798 | urb->setup_packet, |
9251644a | 799 | sizeof(struct usb_ctrlrequest), |
1da177e4 | 800 | DMA_TO_DEVICE); |
2c044a48 GKH |
801 | /* FIXME generic api broken like pci, can't report errors */ |
802 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
803 | } else |
804 | urb->transfer_dma = ~0; | |
805 | urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | |
806 | | URB_NO_SETUP_DMA_MAP); | |
807 | return urb; | |
808 | } | |
782e70c6 | 809 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
810 | #endif /* 0 */ |
811 | ||
812 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
813 | * XXX please determine whether the sync is to transfer ownership of | |
814 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
815 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
816 | */ | |
817 | #if 0 | |
818 | ||
819 | /** | |
820 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
821 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
822 | */ | |
9251644a | 823 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
824 | { |
825 | struct usb_bus *bus; | |
826 | struct device *controller; | |
827 | ||
828 | if (!urb | |
829 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
830 | || !urb->dev | |
831 | || !(bus = urb->dev->bus) | |
832 | || !(controller = bus->controller)) | |
833 | return; | |
834 | ||
835 | if (controller->dma_mask) { | |
9b8e7ba6 | 836 | dma_sync_single_for_cpu(controller, |
1da177e4 | 837 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 838 | usb_pipein(urb->pipe) |
1da177e4 | 839 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 840 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 841 | dma_sync_single_for_cpu(controller, |
1da177e4 | 842 | urb->setup_dma, |
9251644a | 843 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
844 | DMA_TO_DEVICE); |
845 | } | |
846 | } | |
782e70c6 | 847 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
848 | #endif |
849 | ||
850 | /** | |
851 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
852 | * @urb: urb whose transfer_buffer will be unmapped | |
853 | * | |
854 | * Reverses the effect of usb_buffer_map(). | |
855 | */ | |
856 | #if 0 | |
9251644a | 857 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
858 | { |
859 | struct usb_bus *bus; | |
860 | struct device *controller; | |
861 | ||
862 | if (!urb | |
863 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
864 | || !urb->dev | |
865 | || !(bus = urb->dev->bus) | |
866 | || !(controller = bus->controller)) | |
867 | return; | |
868 | ||
869 | if (controller->dma_mask) { | |
9251644a | 870 | dma_unmap_single(controller, |
1da177e4 | 871 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 872 | usb_pipein(urb->pipe) |
1da177e4 | 873 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
874 | if (usb_pipecontrol(urb->pipe)) |
875 | dma_unmap_single(controller, | |
1da177e4 | 876 | urb->setup_dma, |
9251644a | 877 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
878 | DMA_TO_DEVICE); |
879 | } | |
880 | urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP | |
881 | | URB_NO_SETUP_DMA_MAP); | |
882 | } | |
782e70c6 | 883 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
884 | #endif /* 0 */ |
885 | ||
886 | /** | |
887 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
888 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 889 | * @is_in: mapping transfer direction |
1da177e4 LT |
890 | * @sg: the scatterlist to map |
891 | * @nents: the number of entries in the scatterlist | |
892 | * | |
893 | * Return value is either < 0 (indicating no buffers could be mapped), or | |
894 | * the number of DMA mapping array entries in the scatterlist. | |
895 | * | |
896 | * The caller is responsible for placing the resulting DMA addresses from | |
897 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
898 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
899 | * | |
900 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
901 | * to complete before starting the next I/O. This is particularly easy | |
902 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
903 | * mapping entry returned, stopping on the first error or when all succeed. | |
904 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
905 | * | |
906 | * This call would normally be used when translating scatterlist requests, | |
907 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
908 | * may be able to coalesce mappings for improved I/O efficiency. | |
909 | * | |
910 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
911 | */ | |
5e60a161 | 912 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 913 | struct scatterlist *sg, int nents) |
1da177e4 LT |
914 | { |
915 | struct usb_bus *bus; | |
916 | struct device *controller; | |
917 | ||
918 | if (!dev | |
1da177e4 LT |
919 | || !(bus = dev->bus) |
920 | || !(controller = bus->controller) | |
921 | || !controller->dma_mask) | |
2912282c | 922 | return -EINVAL; |
1da177e4 | 923 | |
2c044a48 | 924 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 925 | return dma_map_sg(controller, sg, nents, |
2912282c | 926 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 927 | } |
782e70c6 | 928 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
1da177e4 LT |
929 | |
930 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
931 | * XXX please determine whether the sync is to transfer ownership of | |
932 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
933 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
934 | */ | |
935 | #if 0 | |
936 | ||
937 | /** | |
938 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
939 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 940 | * @is_in: mapping transfer direction |
1da177e4 LT |
941 | * @sg: the scatterlist to synchronize |
942 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
943 | * | |
944 | * Use this when you are re-using a scatterlist's data buffers for | |
945 | * another USB request. | |
946 | */ | |
5e60a161 | 947 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 948 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
949 | { |
950 | struct usb_bus *bus; | |
951 | struct device *controller; | |
952 | ||
953 | if (!dev | |
954 | || !(bus = dev->bus) | |
955 | || !(controller = bus->controller) | |
956 | || !controller->dma_mask) | |
957 | return; | |
958 | ||
9b8e7ba6 FT |
959 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
960 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 961 | } |
782e70c6 | 962 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
963 | #endif |
964 | ||
965 | /** | |
966 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
967 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 968 | * @is_in: mapping transfer direction |
1da177e4 LT |
969 | * @sg: the scatterlist to unmap |
970 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
971 | * | |
972 | * Reverses the effect of usb_buffer_map_sg(). | |
973 | */ | |
5e60a161 | 974 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 975 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
976 | { |
977 | struct usb_bus *bus; | |
978 | struct device *controller; | |
979 | ||
980 | if (!dev | |
981 | || !(bus = dev->bus) | |
982 | || !(controller = bus->controller) | |
983 | || !controller->dma_mask) | |
984 | return; | |
985 | ||
9251644a | 986 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 987 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 988 | } |
782e70c6 | 989 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
1da177e4 | 990 | |
785895ff RR |
991 | /* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */ |
992 | #ifdef MODULE | |
993 | module_param(nousb, bool, 0444); | |
994 | #else | |
995 | core_param(nousb, nousb, bool, 0444); | |
996 | #endif | |
1da177e4 LT |
997 | |
998 | /* | |
999 | * for external read access to <nousb> | |
1000 | */ | |
1001 | int usb_disabled(void) | |
1002 | { | |
1003 | return nousb; | |
1004 | } | |
782e70c6 | 1005 | EXPORT_SYMBOL_GPL(usb_disabled); |
1da177e4 | 1006 | |
3b23dd6f AS |
1007 | /* |
1008 | * Notifications of device and interface registration | |
1009 | */ | |
1010 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
1011 | void *data) | |
1012 | { | |
1013 | struct device *dev = data; | |
1014 | ||
1015 | switch (action) { | |
1016 | case BUS_NOTIFY_ADD_DEVICE: | |
1017 | if (dev->type == &usb_device_type) | |
1018 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
1019 | else if (dev->type == &usb_if_device_type) | |
1020 | (void) usb_create_sysfs_intf_files( | |
1021 | to_usb_interface(dev)); | |
1022 | break; | |
1023 | ||
1024 | case BUS_NOTIFY_DEL_DEVICE: | |
1025 | if (dev->type == &usb_device_type) | |
1026 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
1027 | else if (dev->type == &usb_if_device_type) | |
1028 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
1029 | break; | |
1030 | } | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static struct notifier_block usb_bus_nb = { | |
1035 | .notifier_call = usb_bus_notify, | |
1036 | }; | |
1037 | ||
00048b8b GKH |
1038 | struct dentry *usb_debug_root; |
1039 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
1040 | ||
97d7b7a4 GKH |
1041 | struct dentry *usb_debug_devices; |
1042 | ||
00048b8b GKH |
1043 | static int usb_debugfs_init(void) |
1044 | { | |
1045 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
1046 | if (!usb_debug_root) | |
1047 | return -ENOENT; | |
97d7b7a4 GKH |
1048 | |
1049 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
1050 | usb_debug_root, NULL, | |
1051 | &usbfs_devices_fops); | |
1052 | if (!usb_debug_devices) { | |
1053 | debugfs_remove(usb_debug_root); | |
1054 | usb_debug_root = NULL; | |
1055 | return -ENOENT; | |
1056 | } | |
1057 | ||
00048b8b GKH |
1058 | return 0; |
1059 | } | |
1060 | ||
1061 | static void usb_debugfs_cleanup(void) | |
1062 | { | |
97d7b7a4 | 1063 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1064 | debugfs_remove(usb_debug_root); |
1065 | } | |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Init | |
1069 | */ | |
1070 | static int __init usb_init(void) | |
1071 | { | |
1072 | int retval; | |
1073 | if (nousb) { | |
9251644a | 1074 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1075 | return 0; |
1076 | } | |
1077 | ||
00048b8b GKH |
1078 | retval = usb_debugfs_init(); |
1079 | if (retval) | |
1080 | goto out; | |
1081 | ||
bd859281 AS |
1082 | retval = ksuspend_usb_init(); |
1083 | if (retval) | |
1084 | goto out; | |
1da177e4 | 1085 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1086 | if (retval) |
bd859281 | 1087 | goto bus_register_failed; |
3b23dd6f AS |
1088 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1089 | if (retval) | |
1090 | goto bus_notifier_failed; | |
1da177e4 LT |
1091 | retval = usb_major_init(); |
1092 | if (retval) | |
1093 | goto major_init_failed; | |
fbf82fd2 KS |
1094 | retval = usb_register(&usbfs_driver); |
1095 | if (retval) | |
1096 | goto driver_register_failed; | |
9f8b17e6 | 1097 | retval = usb_devio_init(); |
fbf82fd2 | 1098 | if (retval) |
9f8b17e6 | 1099 | goto usb_devio_init_failed; |
1da177e4 LT |
1100 | retval = usbfs_init(); |
1101 | if (retval) | |
1102 | goto fs_init_failed; | |
1103 | retval = usb_hub_init(); | |
1104 | if (retval) | |
1105 | goto hub_init_failed; | |
8bb54ab5 | 1106 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1107 | if (!retval) |
1108 | goto out; | |
1109 | ||
1110 | usb_hub_cleanup(); | |
1111 | hub_init_failed: | |
1112 | usbfs_cleanup(); | |
1113 | fs_init_failed: | |
9f8b17e6 KS |
1114 | usb_devio_cleanup(); |
1115 | usb_devio_init_failed: | |
fbf82fd2 KS |
1116 | usb_deregister(&usbfs_driver); |
1117 | driver_register_failed: | |
1118 | usb_major_cleanup(); | |
1da177e4 | 1119 | major_init_failed: |
3b23dd6f AS |
1120 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1121 | bus_notifier_failed: | |
1da177e4 | 1122 | bus_unregister(&usb_bus_type); |
bd859281 AS |
1123 | bus_register_failed: |
1124 | ksuspend_usb_cleanup(); | |
1da177e4 LT |
1125 | out: |
1126 | return retval; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Cleanup | |
1131 | */ | |
1132 | static void __exit usb_exit(void) | |
1133 | { | |
1134 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1135 | if (nousb) | |
1136 | return; | |
1137 | ||
8bb54ab5 | 1138 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 LT |
1139 | usb_major_cleanup(); |
1140 | usbfs_cleanup(); | |
fbf82fd2 | 1141 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1142 | usb_devio_cleanup(); |
1da177e4 | 1143 | usb_hub_cleanup(); |
3b23dd6f | 1144 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1145 | bus_unregister(&usb_bus_type); |
bd859281 | 1146 | ksuspend_usb_cleanup(); |
00048b8b | 1147 | usb_debugfs_cleanup(); |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | subsys_initcall(usb_init); | |
1151 | module_exit(usb_exit); | |
1da177e4 | 1152 | MODULE_LICENSE("GPL"); |