]>
Commit | Line | Data |
---|---|---|
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> |
27729aad | 35 | #include <linux/usb/hcd.h> |
4186ecf8 | 36 | #include <linux/mutex.h> |
bd859281 | 37 | #include <linux/workqueue.h> |
00048b8b | 38 | #include <linux/debugfs.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
87ae9afd | 41 | #include <linux/scatterlist.h> |
1da177e4 LT |
42 | #include <linux/mm.h> |
43 | #include <linux/dma-mapping.h> | |
44 | ||
1da177e4 LT |
45 | #include "usb.h" |
46 | ||
1da177e4 LT |
47 | |
48 | const char *usbcore_name = "usbcore"; | |
49 | ||
90ab5ee9 | 50 | static bool nousb; /* Disable USB when built into kernel image */ |
1da177e4 | 51 | |
b5e795f8 AS |
52 | #ifdef CONFIG_USB_SUSPEND |
53 | static int usb_autosuspend_delay = 2; /* Default delay value, | |
54 | * in seconds */ | |
eaafbc3a | 55 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
56 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
57 | ||
58 | #else | |
59 | #define usb_autosuspend_delay 0 | |
60 | #endif | |
61 | ||
1da177e4 | 62 | |
91017f9c SS |
63 | /** |
64 | * usb_find_alt_setting() - Given a configuration, find the alternate setting | |
65 | * for the given interface. | |
70445ae6 RD |
66 | * @config: the configuration to search (not necessarily the current config). |
67 | * @iface_num: interface number to search in | |
68 | * @alt_num: alternate interface setting number to search for. | |
91017f9c SS |
69 | * |
70 | * Search the configuration's interface cache for the given alt setting. | |
71 | */ | |
72 | struct usb_host_interface *usb_find_alt_setting( | |
73 | struct usb_host_config *config, | |
74 | unsigned int iface_num, | |
75 | unsigned int alt_num) | |
76 | { | |
77 | struct usb_interface_cache *intf_cache = NULL; | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
81 | if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber | |
82 | == iface_num) { | |
83 | intf_cache = config->intf_cache[i]; | |
84 | break; | |
85 | } | |
86 | } | |
87 | if (!intf_cache) | |
88 | return NULL; | |
89 | for (i = 0; i < intf_cache->num_altsetting; i++) | |
90 | if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) | |
91 | return &intf_cache->altsetting[i]; | |
92 | ||
93 | printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " | |
94 | "config %u\n", alt_num, iface_num, | |
95 | config->desc.bConfigurationValue); | |
96 | return NULL; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(usb_find_alt_setting); | |
99 | ||
1da177e4 LT |
100 | /** |
101 | * usb_ifnum_to_if - get the interface object with a given interface number | |
102 | * @dev: the device whose current configuration is considered | |
103 | * @ifnum: the desired interface | |
104 | * | |
105 | * This walks the device descriptor for the currently active configuration | |
106 | * and returns a pointer to the interface with that particular interface | |
107 | * number, or null. | |
108 | * | |
109 | * Note that configuration descriptors are not required to assign interface | |
110 | * numbers sequentially, so that it would be incorrect to assume that | |
111 | * the first interface in that descriptor corresponds to interface zero. | |
112 | * This routine helps device drivers avoid such mistakes. | |
113 | * However, you should make sure that you do the right thing with any | |
114 | * alternate settings available for this interfaces. | |
115 | * | |
116 | * Don't call this function unless you are bound to one of the interfaces | |
117 | * on this device or you have locked the device! | |
118 | */ | |
095bc335 LFC |
119 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
120 | unsigned ifnum) | |
1da177e4 LT |
121 | { |
122 | struct usb_host_config *config = dev->actconfig; | |
123 | int i; | |
124 | ||
125 | if (!config) | |
126 | return NULL; | |
127 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
128 | if (config->interface[i]->altsetting[0] | |
129 | .desc.bInterfaceNumber == ifnum) | |
130 | return config->interface[i]; | |
131 | ||
132 | return NULL; | |
133 | } | |
782e70c6 | 134 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
135 | |
136 | /** | |
d0bcabcd | 137 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
138 | * @intf: the interface containing the altsetting in question |
139 | * @altnum: the desired alternate setting number | |
140 | * | |
141 | * This searches the altsetting array of the specified interface for | |
142 | * an entry with the correct bAlternateSetting value and returns a pointer | |
143 | * to that entry, or null. | |
144 | * | |
145 | * Note that altsettings need not be stored sequentially by number, so | |
146 | * it would be incorrect to assume that the first altsetting entry in | |
147 | * the array corresponds to altsetting zero. This routine helps device | |
148 | * drivers avoid such mistakes. | |
149 | * | |
150 | * Don't call this function unless you are bound to the intf interface | |
151 | * or you have locked the device! | |
152 | */ | |
2c044a48 GKH |
153 | struct usb_host_interface *usb_altnum_to_altsetting( |
154 | const struct usb_interface *intf, | |
155 | unsigned int altnum) | |
1da177e4 LT |
156 | { |
157 | int i; | |
158 | ||
159 | for (i = 0; i < intf->num_altsetting; i++) { | |
160 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
161 | return &intf->altsetting[i]; | |
162 | } | |
163 | return NULL; | |
164 | } | |
782e70c6 | 165 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 166 | |
ab7cd8c7 GKH |
167 | struct find_interface_arg { |
168 | int minor; | |
c2d284ee | 169 | struct device_driver *drv; |
ab7cd8c7 GKH |
170 | }; |
171 | ||
2c044a48 | 172 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 173 | { |
ab7cd8c7 | 174 | struct find_interface_arg *arg = data; |
f5691d70 | 175 | struct usb_interface *intf; |
6034a080 | 176 | |
55129666 | 177 | if (!is_usb_interface(dev)) |
6034a080 PM |
178 | return 0; |
179 | ||
c2d284ee RD |
180 | if (dev->driver != arg->drv) |
181 | return 0; | |
6034a080 | 182 | intf = to_usb_interface(dev); |
c2d284ee | 183 | return intf->minor == arg->minor; |
6034a080 PM |
184 | } |
185 | ||
1da177e4 LT |
186 | /** |
187 | * usb_find_interface - find usb_interface pointer for driver and device | |
188 | * @drv: the driver whose current configuration is considered | |
189 | * @minor: the minor number of the desired device | |
190 | * | |
a2582bd4 | 191 | * This walks the bus device list and returns a pointer to the interface |
c2d284ee RD |
192 | * with the matching minor and driver. Note, this only works for devices |
193 | * that share the USB major number. | |
1da177e4 LT |
194 | */ |
195 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
196 | { | |
ab7cd8c7 | 197 | struct find_interface_arg argb; |
a2582bd4 RD |
198 | struct device *dev; |
199 | ||
ab7cd8c7 | 200 | argb.minor = minor; |
c2d284ee RD |
201 | argb.drv = &drv->drvwrap.driver; |
202 | ||
203 | dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); | |
a2582bd4 RD |
204 | |
205 | /* Drop reference count from bus_find_device */ | |
206 | put_device(dev); | |
207 | ||
208 | return dev ? to_usb_interface(dev) : NULL; | |
1da177e4 | 209 | } |
782e70c6 | 210 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 211 | |
1da177e4 LT |
212 | /** |
213 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
214 | * @dev: device that's been disconnected | |
215 | * | |
216 | * Will be called only by the device core when all users of this usb device are | |
217 | * done. | |
218 | */ | |
219 | static void usb_release_dev(struct device *dev) | |
220 | { | |
221 | struct usb_device *udev; | |
c6515272 | 222 | struct usb_hcd *hcd; |
1da177e4 LT |
223 | |
224 | udev = to_usb_device(dev); | |
c6515272 | 225 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
226 | |
227 | usb_destroy_configuration(udev); | |
3148bf04 | 228 | usb_release_bos_descriptor(udev); |
c6515272 | 229 | usb_put_hcd(hcd); |
1da177e4 LT |
230 | kfree(udev->product); |
231 | kfree(udev->manufacturer); | |
232 | kfree(udev->serial); | |
233 | kfree(udev); | |
234 | } | |
235 | ||
4a9bee82 AS |
236 | #ifdef CONFIG_HOTPLUG |
237 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
238 | { | |
239 | struct usb_device *usb_dev; | |
240 | ||
241 | usb_dev = to_usb_device(dev); | |
242 | ||
243 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
244 | return -ENOMEM; | |
245 | ||
246 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
247 | return -ENOMEM; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | #else | |
253 | ||
254 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
255 | { | |
256 | return -ENODEV; | |
257 | } | |
258 | #endif /* CONFIG_HOTPLUG */ | |
259 | ||
645daaab AS |
260 | #ifdef CONFIG_PM |
261 | ||
f2189c47 AS |
262 | /* USB device Power-Management thunks. |
263 | * There's no need to distinguish here between quiescing a USB device | |
264 | * and powering it down; the generic_suspend() routine takes care of | |
265 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
266 | * USB interfaces there's no difference at all. | |
267 | */ | |
268 | ||
269 | static int usb_dev_prepare(struct device *dev) | |
270 | { | |
271 | return 0; /* Implement eventually? */ | |
272 | } | |
273 | ||
274 | static void usb_dev_complete(struct device *dev) | |
275 | { | |
276 | /* Currently used only for rebinding interfaces */ | |
98d9a82e | 277 | usb_resume_complete(dev); |
f2189c47 AS |
278 | } |
279 | ||
280 | static int usb_dev_suspend(struct device *dev) | |
281 | { | |
282 | return usb_suspend(dev, PMSG_SUSPEND); | |
283 | } | |
284 | ||
285 | static int usb_dev_resume(struct device *dev) | |
286 | { | |
65bfd296 | 287 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
288 | } |
289 | ||
290 | static int usb_dev_freeze(struct device *dev) | |
291 | { | |
292 | return usb_suspend(dev, PMSG_FREEZE); | |
293 | } | |
294 | ||
295 | static int usb_dev_thaw(struct device *dev) | |
296 | { | |
65bfd296 | 297 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
298 | } |
299 | ||
300 | static int usb_dev_poweroff(struct device *dev) | |
301 | { | |
302 | return usb_suspend(dev, PMSG_HIBERNATE); | |
303 | } | |
304 | ||
305 | static int usb_dev_restore(struct device *dev) | |
306 | { | |
65bfd296 | 307 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
308 | } |
309 | ||
47145210 | 310 | static const struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
311 | .prepare = usb_dev_prepare, |
312 | .complete = usb_dev_complete, | |
313 | .suspend = usb_dev_suspend, | |
314 | .resume = usb_dev_resume, | |
315 | .freeze = usb_dev_freeze, | |
316 | .thaw = usb_dev_thaw, | |
317 | .poweroff = usb_dev_poweroff, | |
318 | .restore = usb_dev_restore, | |
e1620d59 RW |
319 | #ifdef CONFIG_USB_SUSPEND |
320 | .runtime_suspend = usb_runtime_suspend, | |
321 | .runtime_resume = usb_runtime_resume, | |
322 | .runtime_idle = usb_runtime_idle, | |
323 | #endif | |
f2189c47 AS |
324 | }; |
325 | ||
db063507 | 326 | #endif /* CONFIG_PM */ |
645daaab | 327 | |
f7a386c5 | 328 | |
2c9ede55 | 329 | static char *usb_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
330 | { |
331 | struct usb_device *usb_dev; | |
332 | ||
333 | usb_dev = to_usb_device(dev); | |
334 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
335 | usb_dev->bus->busnum, usb_dev->devnum); | |
336 | } | |
337 | ||
f2189c47 AS |
338 | struct device_type usb_device_type = { |
339 | .name = "usb_device", | |
340 | .release = usb_release_dev, | |
341 | .uevent = usb_dev_uevent, | |
e454cea2 | 342 | .devnode = usb_devnode, |
b409214c | 343 | #ifdef CONFIG_PM |
f2189c47 | 344 | .pm = &usb_device_pm_ops, |
b409214c | 345 | #endif |
f2189c47 AS |
346 | }; |
347 | ||
d7d07255 IPG |
348 | |
349 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
350 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
351 | { | |
352 | struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); | |
353 | return hcd->wireless; | |
354 | } | |
355 | ||
356 | ||
1da177e4 LT |
357 | /** |
358 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
359 | * @parent: hub to which device is connected; null to allocate a root hub | |
360 | * @bus: bus used to access the device | |
361 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 362 | * Context: !in_interrupt() |
1da177e4 LT |
363 | * |
364 | * Only hub drivers (including virtual root hub drivers for host | |
365 | * controllers) should ever call this. | |
366 | * | |
367 | * This call may not be used in a non-sleeping context. | |
368 | */ | |
2c044a48 GKH |
369 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
370 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
371 | { |
372 | struct usb_device *dev; | |
d7d07255 IPG |
373 | struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); |
374 | unsigned root_hub = 0; | |
1da177e4 | 375 | |
0a1ef3b5 | 376 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
377 | if (!dev) |
378 | return NULL; | |
379 | ||
17200583 | 380 | if (!usb_get_hcd(bus_to_hcd(bus))) { |
1da177e4 LT |
381 | kfree(dev); |
382 | return NULL; | |
383 | } | |
c6515272 SS |
384 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
385 | if (usb_hcd->driver->alloc_dev && parent && | |
386 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
387 | usb_put_hcd(bus_to_hcd(bus)); | |
388 | kfree(dev); | |
389 | return NULL; | |
390 | } | |
1da177e4 LT |
391 | |
392 | device_initialize(&dev->dev); | |
393 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 394 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 395 | dev->dev.groups = usb_device_groups; |
1da177e4 | 396 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 397 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 398 | dev->state = USB_STATE_ATTACHED; |
4d59d8a1 | 399 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
400 | |
401 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
402 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
403 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
404 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 405 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 406 | dev->can_submit = 1; |
1da177e4 LT |
407 | |
408 | /* Save readable and stable topology id, distinguishing devices | |
409 | * by location for diagnostics, tools, driver model, etc. The | |
410 | * string is a path along hub ports, from the root. Each device's | |
411 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 412 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
413 | * as stable: bus->busnum changes easily from modprobe order, |
414 | * cardbus or pci hotplugging, and so on. | |
415 | */ | |
9251644a ON |
416 | if (unlikely(!parent)) { |
417 | dev->devpath[0] = '0'; | |
7206b001 | 418 | dev->route = 0; |
1da177e4 LT |
419 | |
420 | dev->dev.parent = bus->controller; | |
0031a06e | 421 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 422 | root_hub = 1; |
1da177e4 LT |
423 | } else { |
424 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 425 | if (parent->devpath[0] == '0') { |
9251644a | 426 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 427 | "%d", port1); |
7206b001 SS |
428 | /* Root ports are not counted in route string */ |
429 | dev->route = 0; | |
430 | } else { | |
9251644a | 431 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 432 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
433 | /* Route string assumes hubs have less than 16 ports */ |
434 | if (port1 < 15) | |
435 | dev->route = parent->route + | |
436 | (port1 << ((parent->level - 1)*4)); | |
437 | else | |
438 | dev->route = parent->route + | |
439 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 440 | } |
1da177e4 LT |
441 | |
442 | dev->dev.parent = &parent->dev; | |
0031a06e | 443 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 LT |
444 | |
445 | /* hub driver sets up TT records */ | |
446 | } | |
447 | ||
12c3da34 | 448 | dev->portnum = port1; |
1da177e4 LT |
449 | dev->bus = bus; |
450 | dev->parent = parent; | |
451 | INIT_LIST_HEAD(&dev->filelist); | |
452 | ||
645daaab | 453 | #ifdef CONFIG_PM |
fcc4a01e AS |
454 | pm_runtime_set_autosuspend_delay(&dev->dev, |
455 | usb_autosuspend_delay * 1000); | |
15123006 SS |
456 | dev->connect_time = jiffies; |
457 | dev->active_duration = -jiffies; | |
645daaab | 458 | #endif |
d7d07255 IPG |
459 | if (root_hub) /* Root hub always ok [and always wired] */ |
460 | dev->authorized = 1; | |
461 | else { | |
462 | dev->authorized = usb_hcd->authorized_default; | |
463 | dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; | |
464 | } | |
1da177e4 LT |
465 | return dev; |
466 | } | |
467 | ||
468 | /** | |
469 | * usb_get_dev - increments the reference count of the usb device structure | |
470 | * @dev: the device being referenced | |
471 | * | |
472 | * Each live reference to a device should be refcounted. | |
473 | * | |
474 | * Drivers for USB interfaces should normally record such references in | |
475 | * their probe() methods, when they bind to an interface, and release | |
476 | * them by calling usb_put_dev(), in their disconnect() methods. | |
477 | * | |
478 | * A pointer to the device with the incremented reference counter is returned. | |
479 | */ | |
480 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
481 | { | |
482 | if (dev) | |
483 | get_device(&dev->dev); | |
484 | return dev; | |
485 | } | |
782e70c6 | 486 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
487 | |
488 | /** | |
489 | * usb_put_dev - release a use of the usb device structure | |
490 | * @dev: device that's been disconnected | |
491 | * | |
492 | * Must be called when a user of a device is finished with it. When the last | |
493 | * user of the device calls this function, the memory of the device is freed. | |
494 | */ | |
495 | void usb_put_dev(struct usb_device *dev) | |
496 | { | |
497 | if (dev) | |
498 | put_device(&dev->dev); | |
499 | } | |
782e70c6 | 500 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
501 | |
502 | /** | |
503 | * usb_get_intf - increments the reference count of the usb interface structure | |
504 | * @intf: the interface being referenced | |
505 | * | |
506 | * Each live reference to a interface must be refcounted. | |
507 | * | |
508 | * Drivers for USB interfaces should normally record such references in | |
509 | * their probe() methods, when they bind to an interface, and release | |
510 | * them by calling usb_put_intf(), in their disconnect() methods. | |
511 | * | |
512 | * A pointer to the interface with the incremented reference counter is | |
513 | * returned. | |
514 | */ | |
515 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
516 | { | |
517 | if (intf) | |
518 | get_device(&intf->dev); | |
519 | return intf; | |
520 | } | |
782e70c6 | 521 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
522 | |
523 | /** | |
524 | * usb_put_intf - release a use of the usb interface structure | |
525 | * @intf: interface that's been decremented | |
526 | * | |
527 | * Must be called when a user of an interface is finished with it. When the | |
528 | * last user of the interface calls this function, the memory of the interface | |
529 | * is freed. | |
530 | */ | |
531 | void usb_put_intf(struct usb_interface *intf) | |
532 | { | |
533 | if (intf) | |
534 | put_device(&intf->dev); | |
535 | } | |
782e70c6 | 536 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
537 | |
538 | /* USB device locking | |
539 | * | |
9ad3d6cc AS |
540 | * USB devices and interfaces are locked using the semaphore in their |
541 | * embedded struct device. The hub driver guarantees that whenever a | |
542 | * device is connected or disconnected, drivers are called with the | |
543 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
544 | * |
545 | * Complications arise when several devices are to be locked at the same | |
546 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
547 | * do this; nobody else needs to worry about it. The rule for locking |
548 | * is simple: | |
1da177e4 LT |
549 | * |
550 | * When locking both a device and its parent, always lock the | |
551 | * the parent first. | |
552 | */ | |
553 | ||
1da177e4 | 554 | /** |
d0bcabcd | 555 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
556 | * @udev: device that's being locked |
557 | * @iface: interface bound to the driver making the request (optional) | |
558 | * | |
559 | * Attempts to acquire the device lock, but fails if the device is | |
560 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
561 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
562 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
563 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 564 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 565 | * |
011b15df | 566 | * Returns a negative error code for failure, otherwise 0. |
1da177e4 LT |
567 | */ |
568 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 569 | const struct usb_interface *iface) |
1da177e4 | 570 | { |
3ea15966 AS |
571 | unsigned long jiffies_expire = jiffies + HZ; |
572 | ||
1da177e4 LT |
573 | if (udev->state == USB_STATE_NOTATTACHED) |
574 | return -ENODEV; | |
575 | if (udev->state == USB_STATE_SUSPENDED) | |
576 | return -EHOSTUNREACH; | |
011b15df AS |
577 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
578 | iface->condition == USB_INTERFACE_UNBOUND)) | |
579 | return -EINTR; | |
1da177e4 | 580 | |
3142788b | 581 | while (!usb_trylock_device(udev)) { |
3ea15966 AS |
582 | |
583 | /* If we can't acquire the lock after waiting one second, | |
584 | * we're probably deadlocked */ | |
585 | if (time_after(jiffies, jiffies_expire)) | |
586 | return -EBUSY; | |
587 | ||
1da177e4 LT |
588 | msleep(15); |
589 | if (udev->state == USB_STATE_NOTATTACHED) | |
590 | return -ENODEV; | |
591 | if (udev->state == USB_STATE_SUSPENDED) | |
592 | return -EHOSTUNREACH; | |
011b15df AS |
593 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
594 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
595 | return -EINTR; |
596 | } | |
011b15df | 597 | return 0; |
1da177e4 | 598 | } |
782e70c6 | 599 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 | 600 | |
1da177e4 LT |
601 | /** |
602 | * usb_get_current_frame_number - return current bus frame number | |
603 | * @dev: the device whose bus is being queried | |
604 | * | |
605 | * Returns the current frame number for the USB host controller | |
606 | * used with the given USB device. This can be used when scheduling | |
607 | * isochronous requests. | |
608 | * | |
609 | * Note that different kinds of host controller have different | |
610 | * "scheduling horizons". While one type might support scheduling only | |
611 | * 32 frames into the future, others could support scheduling up to | |
612 | * 1024 frames into the future. | |
613 | */ | |
614 | int usb_get_current_frame_number(struct usb_device *dev) | |
615 | { | |
9251644a | 616 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 617 | } |
782e70c6 | 618 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
619 | |
620 | /*-------------------------------------------------------------------*/ | |
621 | /* | |
622 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
623 | * extra field of the interface and endpoint descriptor structs. | |
624 | */ | |
625 | ||
626 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 627 | unsigned char type, void **ptr) |
1da177e4 LT |
628 | { |
629 | struct usb_descriptor_header *header; | |
630 | ||
631 | while (size >= sizeof(struct usb_descriptor_header)) { | |
632 | header = (struct usb_descriptor_header *)buffer; | |
633 | ||
634 | if (header->bLength < 2) { | |
635 | printk(KERN_ERR | |
636 | "%s: bogus descriptor, type %d length %d\n", | |
637 | usbcore_name, | |
2c044a48 | 638 | header->bDescriptorType, |
1da177e4 LT |
639 | header->bLength); |
640 | return -1; | |
641 | } | |
642 | ||
643 | if (header->bDescriptorType == type) { | |
644 | *ptr = header; | |
645 | return 0; | |
646 | } | |
647 | ||
648 | buffer += header->bLength; | |
649 | size -= header->bLength; | |
650 | } | |
651 | return -1; | |
652 | } | |
782e70c6 | 653 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
654 | |
655 | /** | |
073900a2 | 656 | * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
1da177e4 LT |
657 | * @dev: device the buffer will be used with |
658 | * @size: requested buffer size | |
659 | * @mem_flags: affect whether allocation may block | |
660 | * @dma: used to return DMA address of buffer | |
661 | * | |
662 | * Return value is either null (indicating no buffer could be allocated), or | |
663 | * the cpu-space pointer to a buffer that may be used to perform DMA to the | |
664 | * specified device. Such cpu-space buffers are returned along with the DMA | |
665 | * address (through the pointer provided). | |
666 | * | |
667 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags | |
fbf54dd3 DB |
668 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
669 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 670 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
671 | * Using these buffers also eliminates cacheline sharing problems on |
672 | * architectures where CPU caches are not DMA-coherent. On systems without | |
673 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 | 674 | * |
073900a2 | 675 | * When the buffer is no longer used, free it with usb_free_coherent(). |
1da177e4 | 676 | */ |
073900a2 DM |
677 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags, |
678 | dma_addr_t *dma) | |
1da177e4 | 679 | { |
a6d2bb9f | 680 | if (!dev || !dev->bus) |
1da177e4 | 681 | return NULL; |
9251644a | 682 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 683 | } |
073900a2 | 684 | EXPORT_SYMBOL_GPL(usb_alloc_coherent); |
1da177e4 LT |
685 | |
686 | /** | |
073900a2 | 687 | * usb_free_coherent - free memory allocated with usb_alloc_coherent() |
1da177e4 LT |
688 | * @dev: device the buffer was used with |
689 | * @size: requested buffer size | |
690 | * @addr: CPU address of buffer | |
691 | * @dma: DMA address of buffer | |
692 | * | |
693 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
073900a2 | 694 | * been allocated using usb_alloc_coherent(), and the parameters must match |
fbf54dd3 | 695 | * those provided in that allocation request. |
1da177e4 | 696 | */ |
073900a2 DM |
697 | void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, |
698 | dma_addr_t dma) | |
1da177e4 | 699 | { |
a6d2bb9f | 700 | if (!dev || !dev->bus) |
b94badbb DT |
701 | return; |
702 | if (!addr) | |
703 | return; | |
9251644a | 704 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 705 | } |
073900a2 | 706 | EXPORT_SYMBOL_GPL(usb_free_coherent); |
1da177e4 LT |
707 | |
708 | /** | |
709 | * usb_buffer_map - create DMA mapping(s) for an urb | |
710 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
711 | * | |
712 | * Return value is either null (indicating no buffer could be mapped), or | |
0ede76fc | 713 | * the parameter. URB_NO_TRANSFER_DMA_MAP is |
1da177e4 LT |
714 | * added to urb->transfer_flags if the operation succeeds. If the device |
715 | * is connected to this system through a non-DMA controller, this operation | |
716 | * always succeeds. | |
717 | * | |
718 | * This call would normally be used for an urb which is reused, perhaps | |
719 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
720 | * calls to synchronize memory and dma state. | |
721 | * | |
722 | * Reverse the effect of this call with usb_buffer_unmap(). | |
723 | */ | |
724 | #if 0 | |
9251644a | 725 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
726 | { |
727 | struct usb_bus *bus; | |
728 | struct device *controller; | |
729 | ||
730 | if (!urb | |
731 | || !urb->dev | |
732 | || !(bus = urb->dev->bus) | |
733 | || !(controller = bus->controller)) | |
734 | return NULL; | |
735 | ||
736 | if (controller->dma_mask) { | |
9251644a | 737 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 738 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 739 | usb_pipein(urb->pipe) |
1da177e4 | 740 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
2c044a48 GKH |
741 | /* FIXME generic api broken like pci, can't report errors */ |
742 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
743 | } else |
744 | urb->transfer_dma = ~0; | |
0ede76fc | 745 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
1da177e4 LT |
746 | return urb; |
747 | } | |
782e70c6 | 748 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
749 | #endif /* 0 */ |
750 | ||
751 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
752 | * XXX please determine whether the sync is to transfer ownership of | |
753 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
754 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
755 | */ | |
756 | #if 0 | |
757 | ||
758 | /** | |
759 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
760 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
761 | */ | |
9251644a | 762 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
763 | { |
764 | struct usb_bus *bus; | |
765 | struct device *controller; | |
766 | ||
767 | if (!urb | |
768 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
769 | || !urb->dev | |
770 | || !(bus = urb->dev->bus) | |
771 | || !(controller = bus->controller)) | |
772 | return; | |
773 | ||
774 | if (controller->dma_mask) { | |
9b8e7ba6 | 775 | dma_sync_single_for_cpu(controller, |
1da177e4 | 776 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 777 | usb_pipein(urb->pipe) |
1da177e4 | 778 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 779 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 780 | dma_sync_single_for_cpu(controller, |
1da177e4 | 781 | urb->setup_dma, |
9251644a | 782 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
783 | DMA_TO_DEVICE); |
784 | } | |
785 | } | |
782e70c6 | 786 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
787 | #endif |
788 | ||
789 | /** | |
790 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
791 | * @urb: urb whose transfer_buffer will be unmapped | |
792 | * | |
793 | * Reverses the effect of usb_buffer_map(). | |
794 | */ | |
795 | #if 0 | |
9251644a | 796 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
797 | { |
798 | struct usb_bus *bus; | |
799 | struct device *controller; | |
800 | ||
801 | if (!urb | |
802 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
803 | || !urb->dev | |
804 | || !(bus = urb->dev->bus) | |
805 | || !(controller = bus->controller)) | |
806 | return; | |
807 | ||
808 | if (controller->dma_mask) { | |
9251644a | 809 | dma_unmap_single(controller, |
1da177e4 | 810 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 811 | usb_pipein(urb->pipe) |
1da177e4 | 812 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 813 | } |
0ede76fc | 814 | urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP; |
1da177e4 | 815 | } |
782e70c6 | 816 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
817 | #endif /* 0 */ |
818 | ||
ff9c895f | 819 | #if 0 |
1da177e4 LT |
820 | /** |
821 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
822 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 823 | * @is_in: mapping transfer direction |
1da177e4 LT |
824 | * @sg: the scatterlist to map |
825 | * @nents: the number of entries in the scatterlist | |
826 | * | |
827 | * Return value is either < 0 (indicating no buffers could be mapped), or | |
828 | * the number of DMA mapping array entries in the scatterlist. | |
829 | * | |
830 | * The caller is responsible for placing the resulting DMA addresses from | |
831 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
832 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
833 | * | |
834 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
835 | * to complete before starting the next I/O. This is particularly easy | |
836 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
837 | * mapping entry returned, stopping on the first error or when all succeed. | |
838 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
839 | * | |
840 | * This call would normally be used when translating scatterlist requests, | |
841 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
842 | * may be able to coalesce mappings for improved I/O efficiency. | |
843 | * | |
844 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
845 | */ | |
5e60a161 | 846 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 847 | struct scatterlist *sg, int nents) |
1da177e4 LT |
848 | { |
849 | struct usb_bus *bus; | |
850 | struct device *controller; | |
851 | ||
852 | if (!dev | |
1da177e4 LT |
853 | || !(bus = dev->bus) |
854 | || !(controller = bus->controller) | |
855 | || !controller->dma_mask) | |
2912282c | 856 | return -EINVAL; |
1da177e4 | 857 | |
2c044a48 | 858 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 859 | return dma_map_sg(controller, sg, nents, |
2912282c | 860 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 861 | } |
782e70c6 | 862 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
ff9c895f | 863 | #endif |
1da177e4 LT |
864 | |
865 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
866 | * XXX please determine whether the sync is to transfer ownership of | |
867 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
868 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
869 | */ | |
870 | #if 0 | |
871 | ||
872 | /** | |
873 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
874 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 875 | * @is_in: mapping transfer direction |
1da177e4 LT |
876 | * @sg: the scatterlist to synchronize |
877 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
878 | * | |
879 | * Use this when you are re-using a scatterlist's data buffers for | |
880 | * another USB request. | |
881 | */ | |
5e60a161 | 882 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 883 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
884 | { |
885 | struct usb_bus *bus; | |
886 | struct device *controller; | |
887 | ||
888 | if (!dev | |
889 | || !(bus = dev->bus) | |
890 | || !(controller = bus->controller) | |
891 | || !controller->dma_mask) | |
892 | return; | |
893 | ||
9b8e7ba6 FT |
894 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
895 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 896 | } |
782e70c6 | 897 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
898 | #endif |
899 | ||
ff9c895f | 900 | #if 0 |
1da177e4 LT |
901 | /** |
902 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
903 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 904 | * @is_in: mapping transfer direction |
1da177e4 LT |
905 | * @sg: the scatterlist to unmap |
906 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
907 | * | |
908 | * Reverses the effect of usb_buffer_map_sg(). | |
909 | */ | |
5e60a161 | 910 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 911 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
912 | { |
913 | struct usb_bus *bus; | |
914 | struct device *controller; | |
915 | ||
916 | if (!dev | |
917 | || !(bus = dev->bus) | |
918 | || !(controller = bus->controller) | |
919 | || !controller->dma_mask) | |
920 | return; | |
921 | ||
9251644a | 922 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 923 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 924 | } |
782e70c6 | 925 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
ff9c895f | 926 | #endif |
1da177e4 | 927 | |
785895ff RR |
928 | /* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */ |
929 | #ifdef MODULE | |
930 | module_param(nousb, bool, 0444); | |
931 | #else | |
932 | core_param(nousb, nousb, bool, 0444); | |
933 | #endif | |
1da177e4 LT |
934 | |
935 | /* | |
936 | * for external read access to <nousb> | |
937 | */ | |
938 | int usb_disabled(void) | |
939 | { | |
940 | return nousb; | |
941 | } | |
782e70c6 | 942 | EXPORT_SYMBOL_GPL(usb_disabled); |
1da177e4 | 943 | |
3b23dd6f AS |
944 | /* |
945 | * Notifications of device and interface registration | |
946 | */ | |
947 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
948 | void *data) | |
949 | { | |
950 | struct device *dev = data; | |
951 | ||
952 | switch (action) { | |
953 | case BUS_NOTIFY_ADD_DEVICE: | |
954 | if (dev->type == &usb_device_type) | |
955 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
956 | else if (dev->type == &usb_if_device_type) | |
643de624 | 957 | usb_create_sysfs_intf_files(to_usb_interface(dev)); |
3b23dd6f AS |
958 | break; |
959 | ||
960 | case BUS_NOTIFY_DEL_DEVICE: | |
961 | if (dev->type == &usb_device_type) | |
962 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
963 | else if (dev->type == &usb_if_device_type) | |
964 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
965 | break; | |
966 | } | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static struct notifier_block usb_bus_nb = { | |
971 | .notifier_call = usb_bus_notify, | |
972 | }; | |
973 | ||
00048b8b GKH |
974 | struct dentry *usb_debug_root; |
975 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
976 | ||
719a6e88 | 977 | static struct dentry *usb_debug_devices; |
97d7b7a4 | 978 | |
00048b8b GKH |
979 | static int usb_debugfs_init(void) |
980 | { | |
981 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
982 | if (!usb_debug_root) | |
983 | return -ENOENT; | |
97d7b7a4 GKH |
984 | |
985 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
986 | usb_debug_root, NULL, | |
987 | &usbfs_devices_fops); | |
988 | if (!usb_debug_devices) { | |
989 | debugfs_remove(usb_debug_root); | |
990 | usb_debug_root = NULL; | |
991 | return -ENOENT; | |
992 | } | |
993 | ||
00048b8b GKH |
994 | return 0; |
995 | } | |
996 | ||
997 | static void usb_debugfs_cleanup(void) | |
998 | { | |
97d7b7a4 | 999 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1000 | debugfs_remove(usb_debug_root); |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | /* |
1004 | * Init | |
1005 | */ | |
1006 | static int __init usb_init(void) | |
1007 | { | |
1008 | int retval; | |
1009 | if (nousb) { | |
9251644a | 1010 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1011 | return 0; |
1012 | } | |
1013 | ||
00048b8b GKH |
1014 | retval = usb_debugfs_init(); |
1015 | if (retval) | |
1016 | goto out; | |
1017 | ||
ea79c2ed | 1018 | usb_acpi_register(); |
1da177e4 | 1019 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1020 | if (retval) |
bd859281 | 1021 | goto bus_register_failed; |
3b23dd6f AS |
1022 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1023 | if (retval) | |
1024 | goto bus_notifier_failed; | |
1da177e4 LT |
1025 | retval = usb_major_init(); |
1026 | if (retval) | |
1027 | goto major_init_failed; | |
fbf82fd2 KS |
1028 | retval = usb_register(&usbfs_driver); |
1029 | if (retval) | |
1030 | goto driver_register_failed; | |
9f8b17e6 | 1031 | retval = usb_devio_init(); |
fbf82fd2 | 1032 | if (retval) |
9f8b17e6 | 1033 | goto usb_devio_init_failed; |
1da177e4 LT |
1034 | retval = usb_hub_init(); |
1035 | if (retval) | |
1036 | goto hub_init_failed; | |
8bb54ab5 | 1037 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1038 | if (!retval) |
1039 | goto out; | |
1040 | ||
1041 | usb_hub_cleanup(); | |
1042 | hub_init_failed: | |
9f8b17e6 KS |
1043 | usb_devio_cleanup(); |
1044 | usb_devio_init_failed: | |
fbf82fd2 KS |
1045 | usb_deregister(&usbfs_driver); |
1046 | driver_register_failed: | |
1047 | usb_major_cleanup(); | |
1da177e4 | 1048 | major_init_failed: |
3b23dd6f AS |
1049 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1050 | bus_notifier_failed: | |
1da177e4 | 1051 | bus_unregister(&usb_bus_type); |
bd859281 | 1052 | bus_register_failed: |
da0af6e7 | 1053 | usb_acpi_unregister(); |
9bbdf1e0 | 1054 | usb_debugfs_cleanup(); |
1da177e4 LT |
1055 | out: |
1056 | return retval; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Cleanup | |
1061 | */ | |
1062 | static void __exit usb_exit(void) | |
1063 | { | |
1064 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1065 | if (nousb) | |
1066 | return; | |
1067 | ||
8bb54ab5 | 1068 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 | 1069 | usb_major_cleanup(); |
fbf82fd2 | 1070 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1071 | usb_devio_cleanup(); |
1da177e4 | 1072 | usb_hub_cleanup(); |
3b23dd6f | 1073 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1074 | bus_unregister(&usb_bus_type); |
da0af6e7 | 1075 | usb_acpi_unregister(); |
00048b8b | 1076 | usb_debugfs_cleanup(); |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | subsys_initcall(usb_init); | |
1080 | module_exit(usb_exit); | |
1da177e4 | 1081 | MODULE_LICENSE("GPL"); |