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 | |
bb3247a3 | 52 | module_param(nousb, bool, 0444); |
bb3247a3 VK |
53 | |
54 | /* | |
55 | * for external read access to <nousb> | |
56 | */ | |
57 | int usb_disabled(void) | |
58 | { | |
59 | return nousb; | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(usb_disabled); | |
62 | ||
ceb6c9c8 | 63 | #ifdef CONFIG_PM |
b5e795f8 AS |
64 | static int usb_autosuspend_delay = 2; /* Default delay value, |
65 | * in seconds */ | |
eaafbc3a | 66 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
67 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
68 | ||
69 | #else | |
70 | #define usb_autosuspend_delay 0 | |
71 | #endif | |
72 | ||
1da177e4 | 73 | |
91017f9c SS |
74 | /** |
75 | * usb_find_alt_setting() - Given a configuration, find the alternate setting | |
76 | * for the given interface. | |
70445ae6 RD |
77 | * @config: the configuration to search (not necessarily the current config). |
78 | * @iface_num: interface number to search in | |
79 | * @alt_num: alternate interface setting number to search for. | |
91017f9c SS |
80 | * |
81 | * Search the configuration's interface cache for the given alt setting. | |
626f090c YB |
82 | * |
83 | * Return: The alternate setting, if found. %NULL otherwise. | |
91017f9c SS |
84 | */ |
85 | struct usb_host_interface *usb_find_alt_setting( | |
86 | struct usb_host_config *config, | |
87 | unsigned int iface_num, | |
88 | unsigned int alt_num) | |
89 | { | |
90 | struct usb_interface_cache *intf_cache = NULL; | |
91 | int i; | |
92 | ||
93 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
94 | if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber | |
95 | == iface_num) { | |
96 | intf_cache = config->intf_cache[i]; | |
97 | break; | |
98 | } | |
99 | } | |
100 | if (!intf_cache) | |
101 | return NULL; | |
102 | for (i = 0; i < intf_cache->num_altsetting; i++) | |
103 | if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) | |
104 | return &intf_cache->altsetting[i]; | |
105 | ||
106 | printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " | |
107 | "config %u\n", alt_num, iface_num, | |
108 | config->desc.bConfigurationValue); | |
109 | return NULL; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(usb_find_alt_setting); | |
112 | ||
1da177e4 LT |
113 | /** |
114 | * usb_ifnum_to_if - get the interface object with a given interface number | |
115 | * @dev: the device whose current configuration is considered | |
116 | * @ifnum: the desired interface | |
117 | * | |
118 | * This walks the device descriptor for the currently active configuration | |
626f090c | 119 | * to find the interface object with the particular interface number. |
1da177e4 LT |
120 | * |
121 | * Note that configuration descriptors are not required to assign interface | |
122 | * numbers sequentially, so that it would be incorrect to assume that | |
123 | * the first interface in that descriptor corresponds to interface zero. | |
124 | * This routine helps device drivers avoid such mistakes. | |
125 | * However, you should make sure that you do the right thing with any | |
126 | * alternate settings available for this interfaces. | |
127 | * | |
128 | * Don't call this function unless you are bound to one of the interfaces | |
129 | * on this device or you have locked the device! | |
626f090c YB |
130 | * |
131 | * Return: A pointer to the interface that has @ifnum as interface number, | |
132 | * if found. %NULL otherwise. | |
1da177e4 | 133 | */ |
095bc335 LFC |
134 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
135 | unsigned ifnum) | |
1da177e4 LT |
136 | { |
137 | struct usb_host_config *config = dev->actconfig; | |
138 | int i; | |
139 | ||
140 | if (!config) | |
141 | return NULL; | |
142 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
143 | if (config->interface[i]->altsetting[0] | |
144 | .desc.bInterfaceNumber == ifnum) | |
145 | return config->interface[i]; | |
146 | ||
147 | return NULL; | |
148 | } | |
782e70c6 | 149 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
150 | |
151 | /** | |
d0bcabcd | 152 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
153 | * @intf: the interface containing the altsetting in question |
154 | * @altnum: the desired alternate setting number | |
155 | * | |
156 | * This searches the altsetting array of the specified interface for | |
626f090c | 157 | * an entry with the correct bAlternateSetting value. |
1da177e4 LT |
158 | * |
159 | * Note that altsettings need not be stored sequentially by number, so | |
160 | * it would be incorrect to assume that the first altsetting entry in | |
161 | * the array corresponds to altsetting zero. This routine helps device | |
162 | * drivers avoid such mistakes. | |
163 | * | |
164 | * Don't call this function unless you are bound to the intf interface | |
165 | * or you have locked the device! | |
626f090c YB |
166 | * |
167 | * Return: A pointer to the entry of the altsetting array of @intf that | |
168 | * has @altnum as the alternate setting number. %NULL if not found. | |
1da177e4 | 169 | */ |
2c044a48 GKH |
170 | struct usb_host_interface *usb_altnum_to_altsetting( |
171 | const struct usb_interface *intf, | |
172 | unsigned int altnum) | |
1da177e4 LT |
173 | { |
174 | int i; | |
175 | ||
176 | for (i = 0; i < intf->num_altsetting; i++) { | |
177 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
178 | return &intf->altsetting[i]; | |
179 | } | |
180 | return NULL; | |
181 | } | |
782e70c6 | 182 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 183 | |
ab7cd8c7 GKH |
184 | struct find_interface_arg { |
185 | int minor; | |
c2d284ee | 186 | struct device_driver *drv; |
ab7cd8c7 GKH |
187 | }; |
188 | ||
2c044a48 | 189 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 190 | { |
ab7cd8c7 | 191 | struct find_interface_arg *arg = data; |
f5691d70 | 192 | struct usb_interface *intf; |
6034a080 | 193 | |
55129666 | 194 | if (!is_usb_interface(dev)) |
6034a080 | 195 | return 0; |
196 | ||
c2d284ee RD |
197 | if (dev->driver != arg->drv) |
198 | return 0; | |
6034a080 | 199 | intf = to_usb_interface(dev); |
c2d284ee | 200 | return intf->minor == arg->minor; |
6034a080 | 201 | } |
202 | ||
1da177e4 LT |
203 | /** |
204 | * usb_find_interface - find usb_interface pointer for driver and device | |
205 | * @drv: the driver whose current configuration is considered | |
206 | * @minor: the minor number of the desired device | |
207 | * | |
a2582bd4 | 208 | * This walks the bus device list and returns a pointer to the interface |
c2d284ee RD |
209 | * with the matching minor and driver. Note, this only works for devices |
210 | * that share the USB major number. | |
626f090c YB |
211 | * |
212 | * Return: A pointer to the interface with the matching major and @minor. | |
1da177e4 LT |
213 | */ |
214 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
215 | { | |
ab7cd8c7 | 216 | struct find_interface_arg argb; |
a2582bd4 RD |
217 | struct device *dev; |
218 | ||
ab7cd8c7 | 219 | argb.minor = minor; |
c2d284ee RD |
220 | argb.drv = &drv->drvwrap.driver; |
221 | ||
222 | dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); | |
a2582bd4 RD |
223 | |
224 | /* Drop reference count from bus_find_device */ | |
225 | put_device(dev); | |
226 | ||
227 | return dev ? to_usb_interface(dev) : NULL; | |
1da177e4 | 228 | } |
782e70c6 | 229 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 230 | |
9b790915 JW |
231 | struct each_dev_arg { |
232 | void *data; | |
233 | int (*fn)(struct usb_device *, void *); | |
234 | }; | |
235 | ||
236 | static int __each_dev(struct device *dev, void *data) | |
237 | { | |
238 | struct each_dev_arg *arg = (struct each_dev_arg *)data; | |
239 | ||
240 | /* There are struct usb_interface on the same bus, filter them out */ | |
241 | if (!is_usb_device(dev)) | |
242 | return 0; | |
243 | ||
69ab55d7 | 244 | return arg->fn(to_usb_device(dev), arg->data); |
9b790915 JW |
245 | } |
246 | ||
247 | /** | |
248 | * usb_for_each_dev - iterate over all USB devices in the system | |
249 | * @data: data pointer that will be handed to the callback function | |
250 | * @fn: callback function to be called for each USB device | |
251 | * | |
252 | * Iterate over all USB devices and call @fn for each, passing it @data. If it | |
253 | * returns anything other than 0, we break the iteration prematurely and return | |
254 | * that value. | |
255 | */ | |
256 | int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)) | |
257 | { | |
258 | struct each_dev_arg arg = {data, fn}; | |
259 | ||
260 | return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev); | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(usb_for_each_dev); | |
263 | ||
1da177e4 LT |
264 | /** |
265 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
266 | * @dev: device that's been disconnected | |
267 | * | |
268 | * Will be called only by the device core when all users of this usb device are | |
269 | * done. | |
270 | */ | |
271 | static void usb_release_dev(struct device *dev) | |
272 | { | |
273 | struct usb_device *udev; | |
c6515272 | 274 | struct usb_hcd *hcd; |
1da177e4 LT |
275 | |
276 | udev = to_usb_device(dev); | |
c6515272 | 277 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
278 | |
279 | usb_destroy_configuration(udev); | |
3148bf04 | 280 | usb_release_bos_descriptor(udev); |
c6515272 | 281 | usb_put_hcd(hcd); |
1da177e4 LT |
282 | kfree(udev->product); |
283 | kfree(udev->manufacturer); | |
284 | kfree(udev->serial); | |
285 | kfree(udev); | |
286 | } | |
287 | ||
4a9bee82 AS |
288 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
289 | { | |
290 | struct usb_device *usb_dev; | |
291 | ||
292 | usb_dev = to_usb_device(dev); | |
293 | ||
294 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
295 | return -ENOMEM; | |
296 | ||
297 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
298 | return -ENOMEM; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
645daaab AS |
303 | #ifdef CONFIG_PM |
304 | ||
f2189c47 AS |
305 | /* USB device Power-Management thunks. |
306 | * There's no need to distinguish here between quiescing a USB device | |
307 | * and powering it down; the generic_suspend() routine takes care of | |
308 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
309 | * USB interfaces there's no difference at all. | |
310 | */ | |
311 | ||
312 | static int usb_dev_prepare(struct device *dev) | |
313 | { | |
e3345db8 TV |
314 | struct usb_device *udev = to_usb_device(dev); |
315 | ||
316 | /* Return 0 if the current wakeup setting is wrong, otherwise 1 */ | |
317 | if (udev->do_remote_wakeup != device_may_wakeup(dev)) | |
318 | return 0; | |
319 | ||
320 | return 1; | |
f2189c47 AS |
321 | } |
322 | ||
323 | static void usb_dev_complete(struct device *dev) | |
324 | { | |
325 | /* Currently used only for rebinding interfaces */ | |
98d9a82e | 326 | usb_resume_complete(dev); |
f2189c47 AS |
327 | } |
328 | ||
329 | static int usb_dev_suspend(struct device *dev) | |
330 | { | |
331 | return usb_suspend(dev, PMSG_SUSPEND); | |
332 | } | |
333 | ||
334 | static int usb_dev_resume(struct device *dev) | |
335 | { | |
65bfd296 | 336 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
337 | } |
338 | ||
339 | static int usb_dev_freeze(struct device *dev) | |
340 | { | |
341 | return usb_suspend(dev, PMSG_FREEZE); | |
342 | } | |
343 | ||
344 | static int usb_dev_thaw(struct device *dev) | |
345 | { | |
65bfd296 | 346 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
347 | } |
348 | ||
349 | static int usb_dev_poweroff(struct device *dev) | |
350 | { | |
351 | return usb_suspend(dev, PMSG_HIBERNATE); | |
352 | } | |
353 | ||
354 | static int usb_dev_restore(struct device *dev) | |
355 | { | |
65bfd296 | 356 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
357 | } |
358 | ||
47145210 | 359 | static const struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
360 | .prepare = usb_dev_prepare, |
361 | .complete = usb_dev_complete, | |
362 | .suspend = usb_dev_suspend, | |
363 | .resume = usb_dev_resume, | |
364 | .freeze = usb_dev_freeze, | |
365 | .thaw = usb_dev_thaw, | |
366 | .poweroff = usb_dev_poweroff, | |
367 | .restore = usb_dev_restore, | |
e1620d59 RW |
368 | .runtime_suspend = usb_runtime_suspend, |
369 | .runtime_resume = usb_runtime_resume, | |
370 | .runtime_idle = usb_runtime_idle, | |
f2189c47 AS |
371 | }; |
372 | ||
db063507 | 373 | #endif /* CONFIG_PM */ |
645daaab | 374 | |
f7a386c5 | 375 | |
3c2670e6 | 376 | static char *usb_devnode(struct device *dev, |
4e4098a3 | 377 | umode_t *mode, kuid_t *uid, kgid_t *gid) |
f7a386c5 KS |
378 | { |
379 | struct usb_device *usb_dev; | |
380 | ||
381 | usb_dev = to_usb_device(dev); | |
382 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
383 | usb_dev->bus->busnum, usb_dev->devnum); | |
384 | } | |
385 | ||
f2189c47 AS |
386 | struct device_type usb_device_type = { |
387 | .name = "usb_device", | |
388 | .release = usb_release_dev, | |
389 | .uevent = usb_dev_uevent, | |
e454cea2 | 390 | .devnode = usb_devnode, |
b409214c | 391 | #ifdef CONFIG_PM |
f2189c47 | 392 | .pm = &usb_device_pm_ops, |
b409214c | 393 | #endif |
f2189c47 AS |
394 | }; |
395 | ||
d7d07255 IPG |
396 | |
397 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
398 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
399 | { | |
6ae706ae | 400 | struct usb_hcd *hcd = bus_to_hcd(bus); |
d7d07255 IPG |
401 | return hcd->wireless; |
402 | } | |
403 | ||
404 | ||
1da177e4 LT |
405 | /** |
406 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
407 | * @parent: hub to which device is connected; null to allocate a root hub | |
408 | * @bus: bus used to access the device | |
409 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 410 | * Context: !in_interrupt() |
1da177e4 LT |
411 | * |
412 | * Only hub drivers (including virtual root hub drivers for host | |
413 | * controllers) should ever call this. | |
414 | * | |
415 | * This call may not be used in a non-sleeping context. | |
626f090c YB |
416 | * |
417 | * Return: On success, a pointer to the allocated usb device. %NULL on | |
418 | * failure. | |
1da177e4 | 419 | */ |
2c044a48 GKH |
420 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
421 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
422 | { |
423 | struct usb_device *dev; | |
30b1e495 | 424 | struct usb_hcd *usb_hcd = bus_to_hcd(bus); |
d7d07255 | 425 | unsigned root_hub = 0; |
1da177e4 | 426 | |
0a1ef3b5 | 427 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
428 | if (!dev) |
429 | return NULL; | |
430 | ||
30b1e495 | 431 | if (!usb_get_hcd(usb_hcd)) { |
1da177e4 LT |
432 | kfree(dev); |
433 | return NULL; | |
434 | } | |
c6515272 SS |
435 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
436 | if (usb_hcd->driver->alloc_dev && parent && | |
437 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
438 | usb_put_hcd(bus_to_hcd(bus)); | |
439 | kfree(dev); | |
440 | return NULL; | |
441 | } | |
1da177e4 LT |
442 | |
443 | device_initialize(&dev->dev); | |
444 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 445 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 446 | dev->dev.groups = usb_device_groups; |
1da177e4 | 447 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 448 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 449 | dev->state = USB_STATE_ATTACHED; |
9cf65991 | 450 | dev->lpm_disable_count = 1; |
4d59d8a1 | 451 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
452 | |
453 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
454 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
455 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
456 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 457 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 458 | dev->can_submit = 1; |
1da177e4 LT |
459 | |
460 | /* Save readable and stable topology id, distinguishing devices | |
461 | * by location for diagnostics, tools, driver model, etc. The | |
462 | * string is a path along hub ports, from the root. Each device's | |
463 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 464 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
465 | * as stable: bus->busnum changes easily from modprobe order, |
466 | * cardbus or pci hotplugging, and so on. | |
467 | */ | |
9251644a ON |
468 | if (unlikely(!parent)) { |
469 | dev->devpath[0] = '0'; | |
7206b001 | 470 | dev->route = 0; |
1da177e4 LT |
471 | |
472 | dev->dev.parent = bus->controller; | |
0031a06e | 473 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 474 | root_hub = 1; |
1da177e4 LT |
475 | } else { |
476 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 477 | if (parent->devpath[0] == '0') { |
9251644a | 478 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 479 | "%d", port1); |
7206b001 SS |
480 | /* Root ports are not counted in route string */ |
481 | dev->route = 0; | |
482 | } else { | |
9251644a | 483 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 484 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
485 | /* Route string assumes hubs have less than 16 ports */ |
486 | if (port1 < 15) | |
487 | dev->route = parent->route + | |
488 | (port1 << ((parent->level - 1)*4)); | |
489 | else | |
490 | dev->route = parent->route + | |
491 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 492 | } |
1da177e4 LT |
493 | |
494 | dev->dev.parent = &parent->dev; | |
0031a06e | 495 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 LT |
496 | |
497 | /* hub driver sets up TT records */ | |
498 | } | |
499 | ||
12c3da34 | 500 | dev->portnum = port1; |
1da177e4 LT |
501 | dev->bus = bus; |
502 | dev->parent = parent; | |
503 | INIT_LIST_HEAD(&dev->filelist); | |
504 | ||
645daaab | 505 | #ifdef CONFIG_PM |
fcc4a01e AS |
506 | pm_runtime_set_autosuspend_delay(&dev->dev, |
507 | usb_autosuspend_delay * 1000); | |
15123006 SS |
508 | dev->connect_time = jiffies; |
509 | dev->active_duration = -jiffies; | |
645daaab | 510 | #endif |
d7d07255 IPG |
511 | if (root_hub) /* Root hub always ok [and always wired] */ |
512 | dev->authorized = 1; | |
513 | else { | |
ff8e2c56 | 514 | dev->authorized = !!HCD_DEV_AUTHORIZED(usb_hcd); |
469271f8 | 515 | dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0; |
d7d07255 | 516 | } |
1da177e4 LT |
517 | return dev; |
518 | } | |
caa67a5e | 519 | EXPORT_SYMBOL_GPL(usb_alloc_dev); |
1da177e4 LT |
520 | |
521 | /** | |
522 | * usb_get_dev - increments the reference count of the usb device structure | |
523 | * @dev: the device being referenced | |
524 | * | |
525 | * Each live reference to a device should be refcounted. | |
526 | * | |
527 | * Drivers for USB interfaces should normally record such references in | |
528 | * their probe() methods, when they bind to an interface, and release | |
529 | * them by calling usb_put_dev(), in their disconnect() methods. | |
530 | * | |
626f090c | 531 | * Return: A pointer to the device with the incremented reference counter. |
1da177e4 LT |
532 | */ |
533 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
534 | { | |
535 | if (dev) | |
536 | get_device(&dev->dev); | |
537 | return dev; | |
538 | } | |
782e70c6 | 539 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
540 | |
541 | /** | |
542 | * usb_put_dev - release a use of the usb device structure | |
543 | * @dev: device that's been disconnected | |
544 | * | |
545 | * Must be called when a user of a device is finished with it. When the last | |
546 | * user of the device calls this function, the memory of the device is freed. | |
547 | */ | |
548 | void usb_put_dev(struct usb_device *dev) | |
549 | { | |
550 | if (dev) | |
551 | put_device(&dev->dev); | |
552 | } | |
782e70c6 | 553 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
554 | |
555 | /** | |
556 | * usb_get_intf - increments the reference count of the usb interface structure | |
557 | * @intf: the interface being referenced | |
558 | * | |
559 | * Each live reference to a interface must be refcounted. | |
560 | * | |
561 | * Drivers for USB interfaces should normally record such references in | |
562 | * their probe() methods, when they bind to an interface, and release | |
563 | * them by calling usb_put_intf(), in their disconnect() methods. | |
564 | * | |
626f090c | 565 | * Return: A pointer to the interface with the incremented reference counter. |
1da177e4 LT |
566 | */ |
567 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
568 | { | |
569 | if (intf) | |
570 | get_device(&intf->dev); | |
571 | return intf; | |
572 | } | |
782e70c6 | 573 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
574 | |
575 | /** | |
576 | * usb_put_intf - release a use of the usb interface structure | |
577 | * @intf: interface that's been decremented | |
578 | * | |
579 | * Must be called when a user of an interface is finished with it. When the | |
580 | * last user of the interface calls this function, the memory of the interface | |
581 | * is freed. | |
582 | */ | |
583 | void usb_put_intf(struct usb_interface *intf) | |
584 | { | |
585 | if (intf) | |
586 | put_device(&intf->dev); | |
587 | } | |
782e70c6 | 588 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
589 | |
590 | /* USB device locking | |
591 | * | |
9ad3d6cc AS |
592 | * USB devices and interfaces are locked using the semaphore in their |
593 | * embedded struct device. The hub driver guarantees that whenever a | |
594 | * device is connected or disconnected, drivers are called with the | |
595 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
596 | * |
597 | * Complications arise when several devices are to be locked at the same | |
598 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
599 | * do this; nobody else needs to worry about it. The rule for locking |
600 | * is simple: | |
1da177e4 LT |
601 | * |
602 | * When locking both a device and its parent, always lock the | |
603 | * the parent first. | |
604 | */ | |
605 | ||
1da177e4 | 606 | /** |
d0bcabcd | 607 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
608 | * @udev: device that's being locked |
609 | * @iface: interface bound to the driver making the request (optional) | |
610 | * | |
611 | * Attempts to acquire the device lock, but fails if the device is | |
612 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
613 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
614 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
615 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 616 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 617 | * |
626f090c | 618 | * Return: A negative error code for failure, otherwise 0. |
1da177e4 LT |
619 | */ |
620 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 621 | const struct usb_interface *iface) |
1da177e4 | 622 | { |
3ea15966 AS |
623 | unsigned long jiffies_expire = jiffies + HZ; |
624 | ||
1da177e4 LT |
625 | if (udev->state == USB_STATE_NOTATTACHED) |
626 | return -ENODEV; | |
627 | if (udev->state == USB_STATE_SUSPENDED) | |
628 | return -EHOSTUNREACH; | |
011b15df AS |
629 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
630 | iface->condition == USB_INTERFACE_UNBOUND)) | |
631 | return -EINTR; | |
1da177e4 | 632 | |
3142788b | 633 | while (!usb_trylock_device(udev)) { |
3ea15966 AS |
634 | |
635 | /* If we can't acquire the lock after waiting one second, | |
636 | * we're probably deadlocked */ | |
637 | if (time_after(jiffies, jiffies_expire)) | |
638 | return -EBUSY; | |
639 | ||
1da177e4 LT |
640 | msleep(15); |
641 | if (udev->state == USB_STATE_NOTATTACHED) | |
642 | return -ENODEV; | |
643 | if (udev->state == USB_STATE_SUSPENDED) | |
644 | return -EHOSTUNREACH; | |
011b15df AS |
645 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
646 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
647 | return -EINTR; |
648 | } | |
011b15df | 649 | return 0; |
1da177e4 | 650 | } |
782e70c6 | 651 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 | 652 | |
1da177e4 LT |
653 | /** |
654 | * usb_get_current_frame_number - return current bus frame number | |
655 | * @dev: the device whose bus is being queried | |
656 | * | |
626f090c YB |
657 | * Return: The current frame number for the USB host controller used |
658 | * with the given USB device. This can be used when scheduling | |
1da177e4 LT |
659 | * isochronous requests. |
660 | * | |
626f090c YB |
661 | * Note: Different kinds of host controller have different "scheduling |
662 | * horizons". While one type might support scheduling only 32 frames | |
663 | * into the future, others could support scheduling up to 1024 frames | |
664 | * into the future. | |
665 | * | |
1da177e4 LT |
666 | */ |
667 | int usb_get_current_frame_number(struct usb_device *dev) | |
668 | { | |
9251644a | 669 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 670 | } |
782e70c6 | 671 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
672 | |
673 | /*-------------------------------------------------------------------*/ | |
674 | /* | |
675 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
676 | * extra field of the interface and endpoint descriptor structs. | |
677 | */ | |
678 | ||
679 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 680 | unsigned char type, void **ptr) |
1da177e4 LT |
681 | { |
682 | struct usb_descriptor_header *header; | |
683 | ||
684 | while (size >= sizeof(struct usb_descriptor_header)) { | |
685 | header = (struct usb_descriptor_header *)buffer; | |
686 | ||
687 | if (header->bLength < 2) { | |
688 | printk(KERN_ERR | |
689 | "%s: bogus descriptor, type %d length %d\n", | |
690 | usbcore_name, | |
2c044a48 | 691 | header->bDescriptorType, |
1da177e4 LT |
692 | header->bLength); |
693 | return -1; | |
694 | } | |
695 | ||
696 | if (header->bDescriptorType == type) { | |
697 | *ptr = header; | |
698 | return 0; | |
699 | } | |
700 | ||
701 | buffer += header->bLength; | |
702 | size -= header->bLength; | |
703 | } | |
704 | return -1; | |
705 | } | |
782e70c6 | 706 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
707 | |
708 | /** | |
073900a2 | 709 | * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
1da177e4 LT |
710 | * @dev: device the buffer will be used with |
711 | * @size: requested buffer size | |
712 | * @mem_flags: affect whether allocation may block | |
713 | * @dma: used to return DMA address of buffer | |
714 | * | |
626f090c YB |
715 | * Return: Either null (indicating no buffer could be allocated), or the |
716 | * cpu-space pointer to a buffer that may be used to perform DMA to the | |
1da177e4 LT |
717 | * specified device. Such cpu-space buffers are returned along with the DMA |
718 | * address (through the pointer provided). | |
719 | * | |
626f090c | 720 | * Note: |
1da177e4 | 721 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
fbf54dd3 DB |
722 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
723 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 724 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
725 | * Using these buffers also eliminates cacheline sharing problems on |
726 | * architectures where CPU caches are not DMA-coherent. On systems without | |
727 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 | 728 | * |
073900a2 | 729 | * When the buffer is no longer used, free it with usb_free_coherent(). |
1da177e4 | 730 | */ |
073900a2 DM |
731 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags, |
732 | dma_addr_t *dma) | |
1da177e4 | 733 | { |
a6d2bb9f | 734 | if (!dev || !dev->bus) |
1da177e4 | 735 | return NULL; |
9251644a | 736 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 737 | } |
073900a2 | 738 | EXPORT_SYMBOL_GPL(usb_alloc_coherent); |
1da177e4 LT |
739 | |
740 | /** | |
073900a2 | 741 | * usb_free_coherent - free memory allocated with usb_alloc_coherent() |
1da177e4 LT |
742 | * @dev: device the buffer was used with |
743 | * @size: requested buffer size | |
744 | * @addr: CPU address of buffer | |
745 | * @dma: DMA address of buffer | |
746 | * | |
747 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
073900a2 | 748 | * been allocated using usb_alloc_coherent(), and the parameters must match |
fbf54dd3 | 749 | * those provided in that allocation request. |
1da177e4 | 750 | */ |
073900a2 DM |
751 | void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, |
752 | dma_addr_t dma) | |
1da177e4 | 753 | { |
a6d2bb9f | 754 | if (!dev || !dev->bus) |
b94badbb DT |
755 | return; |
756 | if (!addr) | |
757 | return; | |
9251644a | 758 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 759 | } |
073900a2 | 760 | EXPORT_SYMBOL_GPL(usb_free_coherent); |
1da177e4 LT |
761 | |
762 | /** | |
763 | * usb_buffer_map - create DMA mapping(s) for an urb | |
764 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
765 | * | |
626f090c YB |
766 | * URB_NO_TRANSFER_DMA_MAP is added to urb->transfer_flags if the operation |
767 | * succeeds. If the device is connected to this system through a non-DMA | |
768 | * controller, this operation always succeeds. | |
1da177e4 LT |
769 | * |
770 | * This call would normally be used for an urb which is reused, perhaps | |
771 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
772 | * calls to synchronize memory and dma state. | |
773 | * | |
774 | * Reverse the effect of this call with usb_buffer_unmap(). | |
626f090c YB |
775 | * |
776 | * Return: Either %NULL (indicating no buffer could be mapped), or @urb. | |
777 | * | |
1da177e4 LT |
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); |
2c044a48 GKH |
796 | /* FIXME generic api broken like pci, can't report errors */ |
797 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
798 | } else |
799 | urb->transfer_dma = ~0; | |
0ede76fc | 800 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
1da177e4 LT |
801 | return urb; |
802 | } | |
782e70c6 | 803 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
804 | #endif /* 0 */ |
805 | ||
806 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
807 | * XXX please determine whether the sync is to transfer ownership of | |
808 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
809 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
810 | */ | |
811 | #if 0 | |
812 | ||
813 | /** | |
814 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
815 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
816 | */ | |
9251644a | 817 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
818 | { |
819 | struct usb_bus *bus; | |
820 | struct device *controller; | |
821 | ||
822 | if (!urb | |
823 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
824 | || !urb->dev | |
825 | || !(bus = urb->dev->bus) | |
826 | || !(controller = bus->controller)) | |
827 | return; | |
828 | ||
829 | if (controller->dma_mask) { | |
9b8e7ba6 | 830 | dma_sync_single_for_cpu(controller, |
1da177e4 | 831 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 832 | usb_pipein(urb->pipe) |
1da177e4 | 833 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 834 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 835 | dma_sync_single_for_cpu(controller, |
1da177e4 | 836 | urb->setup_dma, |
9251644a | 837 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
838 | DMA_TO_DEVICE); |
839 | } | |
840 | } | |
782e70c6 | 841 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
842 | #endif |
843 | ||
844 | /** | |
845 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
846 | * @urb: urb whose transfer_buffer will be unmapped | |
847 | * | |
848 | * Reverses the effect of usb_buffer_map(). | |
849 | */ | |
850 | #if 0 | |
9251644a | 851 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
852 | { |
853 | struct usb_bus *bus; | |
854 | struct device *controller; | |
855 | ||
856 | if (!urb | |
857 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
858 | || !urb->dev | |
859 | || !(bus = urb->dev->bus) | |
860 | || !(controller = bus->controller)) | |
861 | return; | |
862 | ||
863 | if (controller->dma_mask) { | |
9251644a | 864 | dma_unmap_single(controller, |
1da177e4 | 865 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 866 | usb_pipein(urb->pipe) |
1da177e4 | 867 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 868 | } |
0ede76fc | 869 | urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP; |
1da177e4 | 870 | } |
782e70c6 | 871 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
872 | #endif /* 0 */ |
873 | ||
ff9c895f | 874 | #if 0 |
1da177e4 LT |
875 | /** |
876 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
877 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 878 | * @is_in: mapping transfer direction |
1da177e4 LT |
879 | * @sg: the scatterlist to map |
880 | * @nents: the number of entries in the scatterlist | |
881 | * | |
626f090c YB |
882 | * Return: Either < 0 (indicating no buffers could be mapped), or the |
883 | * number of DMA mapping array entries in the scatterlist. | |
1da177e4 | 884 | * |
626f090c | 885 | * Note: |
1da177e4 LT |
886 | * The caller is responsible for placing the resulting DMA addresses from |
887 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
888 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
889 | * | |
890 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
891 | * to complete before starting the next I/O. This is particularly easy | |
892 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
893 | * mapping entry returned, stopping on the first error or when all succeed. | |
894 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
895 | * | |
896 | * This call would normally be used when translating scatterlist requests, | |
897 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
898 | * may be able to coalesce mappings for improved I/O efficiency. | |
899 | * | |
900 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
901 | */ | |
5e60a161 | 902 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 903 | struct scatterlist *sg, int nents) |
1da177e4 LT |
904 | { |
905 | struct usb_bus *bus; | |
906 | struct device *controller; | |
907 | ||
908 | if (!dev | |
1da177e4 LT |
909 | || !(bus = dev->bus) |
910 | || !(controller = bus->controller) | |
911 | || !controller->dma_mask) | |
2912282c | 912 | return -EINVAL; |
1da177e4 | 913 | |
2c044a48 | 914 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 915 | return dma_map_sg(controller, sg, nents, |
2912282c | 916 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 917 | } |
782e70c6 | 918 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
ff9c895f | 919 | #endif |
1da177e4 LT |
920 | |
921 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
922 | * XXX please determine whether the sync is to transfer ownership of | |
923 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
924 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
925 | */ | |
926 | #if 0 | |
927 | ||
928 | /** | |
929 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
930 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 931 | * @is_in: mapping transfer direction |
1da177e4 LT |
932 | * @sg: the scatterlist to synchronize |
933 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
934 | * | |
935 | * Use this when you are re-using a scatterlist's data buffers for | |
936 | * another USB request. | |
937 | */ | |
5e60a161 | 938 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 939 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
940 | { |
941 | struct usb_bus *bus; | |
942 | struct device *controller; | |
943 | ||
944 | if (!dev | |
945 | || !(bus = dev->bus) | |
946 | || !(controller = bus->controller) | |
947 | || !controller->dma_mask) | |
948 | return; | |
949 | ||
9b8e7ba6 FT |
950 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
951 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 952 | } |
782e70c6 | 953 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
954 | #endif |
955 | ||
ff9c895f | 956 | #if 0 |
1da177e4 LT |
957 | /** |
958 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
959 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 960 | * @is_in: mapping transfer direction |
1da177e4 LT |
961 | * @sg: the scatterlist to unmap |
962 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
963 | * | |
964 | * Reverses the effect of usb_buffer_map_sg(). | |
965 | */ | |
5e60a161 | 966 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 967 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
968 | { |
969 | struct usb_bus *bus; | |
970 | struct device *controller; | |
971 | ||
972 | if (!dev | |
973 | || !(bus = dev->bus) | |
974 | || !(controller = bus->controller) | |
975 | || !controller->dma_mask) | |
976 | return; | |
977 | ||
9251644a | 978 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 979 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 980 | } |
782e70c6 | 981 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
ff9c895f | 982 | #endif |
1da177e4 | 983 | |
3b23dd6f AS |
984 | /* |
985 | * Notifications of device and interface registration | |
986 | */ | |
987 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
988 | void *data) | |
989 | { | |
990 | struct device *dev = data; | |
991 | ||
992 | switch (action) { | |
993 | case BUS_NOTIFY_ADD_DEVICE: | |
994 | if (dev->type == &usb_device_type) | |
995 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
996 | else if (dev->type == &usb_if_device_type) | |
643de624 | 997 | usb_create_sysfs_intf_files(to_usb_interface(dev)); |
3b23dd6f AS |
998 | break; |
999 | ||
1000 | case BUS_NOTIFY_DEL_DEVICE: | |
1001 | if (dev->type == &usb_device_type) | |
1002 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
1003 | else if (dev->type == &usb_if_device_type) | |
1004 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
1005 | break; | |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static struct notifier_block usb_bus_nb = { | |
1011 | .notifier_call = usb_bus_notify, | |
1012 | }; | |
1013 | ||
00048b8b GKH |
1014 | struct dentry *usb_debug_root; |
1015 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
1016 | ||
719a6e88 | 1017 | static struct dentry *usb_debug_devices; |
97d7b7a4 | 1018 | |
00048b8b GKH |
1019 | static int usb_debugfs_init(void) |
1020 | { | |
1021 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
1022 | if (!usb_debug_root) | |
1023 | return -ENOENT; | |
97d7b7a4 GKH |
1024 | |
1025 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
1026 | usb_debug_root, NULL, | |
1027 | &usbfs_devices_fops); | |
1028 | if (!usb_debug_devices) { | |
1029 | debugfs_remove(usb_debug_root); | |
1030 | usb_debug_root = NULL; | |
1031 | return -ENOENT; | |
1032 | } | |
1033 | ||
00048b8b GKH |
1034 | return 0; |
1035 | } | |
1036 | ||
1037 | static void usb_debugfs_cleanup(void) | |
1038 | { | |
97d7b7a4 | 1039 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1040 | debugfs_remove(usb_debug_root); |
1041 | } | |
1042 | ||
1da177e4 LT |
1043 | /* |
1044 | * Init | |
1045 | */ | |
1046 | static int __init usb_init(void) | |
1047 | { | |
1048 | int retval; | |
1da47f54 | 1049 | if (usb_disabled()) { |
9251644a | 1050 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1051 | return 0; |
1052 | } | |
5efd2ea8 | 1053 | usb_init_pool_max(); |
1da177e4 | 1054 | |
00048b8b GKH |
1055 | retval = usb_debugfs_init(); |
1056 | if (retval) | |
1057 | goto out; | |
1058 | ||
ea79c2ed | 1059 | usb_acpi_register(); |
1da177e4 | 1060 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1061 | if (retval) |
bd859281 | 1062 | goto bus_register_failed; |
3b23dd6f AS |
1063 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1064 | if (retval) | |
1065 | goto bus_notifier_failed; | |
1da177e4 LT |
1066 | retval = usb_major_init(); |
1067 | if (retval) | |
1068 | goto major_init_failed; | |
fbf82fd2 KS |
1069 | retval = usb_register(&usbfs_driver); |
1070 | if (retval) | |
1071 | goto driver_register_failed; | |
9f8b17e6 | 1072 | retval = usb_devio_init(); |
fbf82fd2 | 1073 | if (retval) |
9f8b17e6 | 1074 | goto usb_devio_init_failed; |
1da177e4 LT |
1075 | retval = usb_hub_init(); |
1076 | if (retval) | |
1077 | goto hub_init_failed; | |
8bb54ab5 | 1078 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1079 | if (!retval) |
1080 | goto out; | |
1081 | ||
1082 | usb_hub_cleanup(); | |
1083 | hub_init_failed: | |
9f8b17e6 KS |
1084 | usb_devio_cleanup(); |
1085 | usb_devio_init_failed: | |
fbf82fd2 KS |
1086 | usb_deregister(&usbfs_driver); |
1087 | driver_register_failed: | |
1088 | usb_major_cleanup(); | |
1da177e4 | 1089 | major_init_failed: |
3b23dd6f AS |
1090 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1091 | bus_notifier_failed: | |
1da177e4 | 1092 | bus_unregister(&usb_bus_type); |
bd859281 | 1093 | bus_register_failed: |
da0af6e7 | 1094 | usb_acpi_unregister(); |
9bbdf1e0 | 1095 | usb_debugfs_cleanup(); |
1da177e4 LT |
1096 | out: |
1097 | return retval; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Cleanup | |
1102 | */ | |
1103 | static void __exit usb_exit(void) | |
1104 | { | |
1105 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1da47f54 | 1106 | if (usb_disabled()) |
1da177e4 LT |
1107 | return; |
1108 | ||
8bb54ab5 | 1109 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 | 1110 | usb_major_cleanup(); |
fbf82fd2 | 1111 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1112 | usb_devio_cleanup(); |
1da177e4 | 1113 | usb_hub_cleanup(); |
3b23dd6f | 1114 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1115 | bus_unregister(&usb_bus_type); |
da0af6e7 | 1116 | usb_acpi_unregister(); |
00048b8b | 1117 | usb_debugfs_cleanup(); |
5363de75 | 1118 | idr_destroy(&usb_bus_idr); |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | subsys_initcall(usb_init); | |
1122 | module_exit(usb_exit); | |
1da177e4 | 1123 | MODULE_LICENSE("GPL"); |