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 | |
ceb6c9c8 | 52 | #ifdef CONFIG_PM |
b5e795f8 AS |
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. | |
626f090c YB |
71 | * |
72 | * Return: The alternate setting, if found. %NULL otherwise. | |
91017f9c SS |
73 | */ |
74 | struct usb_host_interface *usb_find_alt_setting( | |
75 | struct usb_host_config *config, | |
76 | unsigned int iface_num, | |
77 | unsigned int alt_num) | |
78 | { | |
79 | struct usb_interface_cache *intf_cache = NULL; | |
80 | int i; | |
81 | ||
82 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
83 | if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber | |
84 | == iface_num) { | |
85 | intf_cache = config->intf_cache[i]; | |
86 | break; | |
87 | } | |
88 | } | |
89 | if (!intf_cache) | |
90 | return NULL; | |
91 | for (i = 0; i < intf_cache->num_altsetting; i++) | |
92 | if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) | |
93 | return &intf_cache->altsetting[i]; | |
94 | ||
95 | printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " | |
96 | "config %u\n", alt_num, iface_num, | |
97 | config->desc.bConfigurationValue); | |
98 | return NULL; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(usb_find_alt_setting); | |
101 | ||
1da177e4 LT |
102 | /** |
103 | * usb_ifnum_to_if - get the interface object with a given interface number | |
104 | * @dev: the device whose current configuration is considered | |
105 | * @ifnum: the desired interface | |
106 | * | |
107 | * This walks the device descriptor for the currently active configuration | |
626f090c | 108 | * to find the interface object with the particular interface number. |
1da177e4 LT |
109 | * |
110 | * Note that configuration descriptors are not required to assign interface | |
111 | * numbers sequentially, so that it would be incorrect to assume that | |
112 | * the first interface in that descriptor corresponds to interface zero. | |
113 | * This routine helps device drivers avoid such mistakes. | |
114 | * However, you should make sure that you do the right thing with any | |
115 | * alternate settings available for this interfaces. | |
116 | * | |
117 | * Don't call this function unless you are bound to one of the interfaces | |
118 | * on this device or you have locked the device! | |
626f090c YB |
119 | * |
120 | * Return: A pointer to the interface that has @ifnum as interface number, | |
121 | * if found. %NULL otherwise. | |
1da177e4 | 122 | */ |
095bc335 LFC |
123 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
124 | unsigned ifnum) | |
1da177e4 LT |
125 | { |
126 | struct usb_host_config *config = dev->actconfig; | |
127 | int i; | |
128 | ||
129 | if (!config) | |
130 | return NULL; | |
131 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
132 | if (config->interface[i]->altsetting[0] | |
133 | .desc.bInterfaceNumber == ifnum) | |
134 | return config->interface[i]; | |
135 | ||
136 | return NULL; | |
137 | } | |
782e70c6 | 138 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
139 | |
140 | /** | |
d0bcabcd | 141 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
142 | * @intf: the interface containing the altsetting in question |
143 | * @altnum: the desired alternate setting number | |
144 | * | |
145 | * This searches the altsetting array of the specified interface for | |
626f090c | 146 | * an entry with the correct bAlternateSetting value. |
1da177e4 LT |
147 | * |
148 | * Note that altsettings need not be stored sequentially by number, so | |
149 | * it would be incorrect to assume that the first altsetting entry in | |
150 | * the array corresponds to altsetting zero. This routine helps device | |
151 | * drivers avoid such mistakes. | |
152 | * | |
153 | * Don't call this function unless you are bound to the intf interface | |
154 | * or you have locked the device! | |
626f090c YB |
155 | * |
156 | * Return: A pointer to the entry of the altsetting array of @intf that | |
157 | * has @altnum as the alternate setting number. %NULL if not found. | |
1da177e4 | 158 | */ |
2c044a48 GKH |
159 | struct usb_host_interface *usb_altnum_to_altsetting( |
160 | const struct usb_interface *intf, | |
161 | unsigned int altnum) | |
1da177e4 LT |
162 | { |
163 | int i; | |
164 | ||
165 | for (i = 0; i < intf->num_altsetting; i++) { | |
166 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
167 | return &intf->altsetting[i]; | |
168 | } | |
169 | return NULL; | |
170 | } | |
782e70c6 | 171 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 172 | |
ab7cd8c7 GKH |
173 | struct find_interface_arg { |
174 | int minor; | |
c2d284ee | 175 | struct device_driver *drv; |
ab7cd8c7 GKH |
176 | }; |
177 | ||
2c044a48 | 178 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 179 | { |
ab7cd8c7 | 180 | struct find_interface_arg *arg = data; |
f5691d70 | 181 | struct usb_interface *intf; |
6034a080 | 182 | |
55129666 | 183 | if (!is_usb_interface(dev)) |
6034a080 | 184 | return 0; |
185 | ||
c2d284ee RD |
186 | if (dev->driver != arg->drv) |
187 | return 0; | |
6034a080 | 188 | intf = to_usb_interface(dev); |
c2d284ee | 189 | return intf->minor == arg->minor; |
6034a080 | 190 | } |
191 | ||
1da177e4 LT |
192 | /** |
193 | * usb_find_interface - find usb_interface pointer for driver and device | |
194 | * @drv: the driver whose current configuration is considered | |
195 | * @minor: the minor number of the desired device | |
196 | * | |
a2582bd4 | 197 | * This walks the bus device list and returns a pointer to the interface |
c2d284ee RD |
198 | * with the matching minor and driver. Note, this only works for devices |
199 | * that share the USB major number. | |
626f090c YB |
200 | * |
201 | * Return: A pointer to the interface with the matching major and @minor. | |
1da177e4 LT |
202 | */ |
203 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
204 | { | |
ab7cd8c7 | 205 | struct find_interface_arg argb; |
a2582bd4 RD |
206 | struct device *dev; |
207 | ||
ab7cd8c7 | 208 | argb.minor = minor; |
c2d284ee RD |
209 | argb.drv = &drv->drvwrap.driver; |
210 | ||
211 | dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); | |
a2582bd4 RD |
212 | |
213 | /* Drop reference count from bus_find_device */ | |
214 | put_device(dev); | |
215 | ||
216 | return dev ? to_usb_interface(dev) : NULL; | |
1da177e4 | 217 | } |
782e70c6 | 218 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 219 | |
9b790915 JW |
220 | struct each_dev_arg { |
221 | void *data; | |
222 | int (*fn)(struct usb_device *, void *); | |
223 | }; | |
224 | ||
225 | static int __each_dev(struct device *dev, void *data) | |
226 | { | |
227 | struct each_dev_arg *arg = (struct each_dev_arg *)data; | |
228 | ||
229 | /* There are struct usb_interface on the same bus, filter them out */ | |
230 | if (!is_usb_device(dev)) | |
231 | return 0; | |
232 | ||
233 | return arg->fn(container_of(dev, struct usb_device, dev), arg->data); | |
234 | } | |
235 | ||
236 | /** | |
237 | * usb_for_each_dev - iterate over all USB devices in the system | |
238 | * @data: data pointer that will be handed to the callback function | |
239 | * @fn: callback function to be called for each USB device | |
240 | * | |
241 | * Iterate over all USB devices and call @fn for each, passing it @data. If it | |
242 | * returns anything other than 0, we break the iteration prematurely and return | |
243 | * that value. | |
244 | */ | |
245 | int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)) | |
246 | { | |
247 | struct each_dev_arg arg = {data, fn}; | |
248 | ||
249 | return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev); | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(usb_for_each_dev); | |
252 | ||
1da177e4 LT |
253 | /** |
254 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
255 | * @dev: device that's been disconnected | |
256 | * | |
257 | * Will be called only by the device core when all users of this usb device are | |
258 | * done. | |
259 | */ | |
260 | static void usb_release_dev(struct device *dev) | |
261 | { | |
262 | struct usb_device *udev; | |
c6515272 | 263 | struct usb_hcd *hcd; |
1da177e4 LT |
264 | |
265 | udev = to_usb_device(dev); | |
c6515272 | 266 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
267 | |
268 | usb_destroy_configuration(udev); | |
3148bf04 | 269 | usb_release_bos_descriptor(udev); |
c6515272 | 270 | usb_put_hcd(hcd); |
1da177e4 LT |
271 | kfree(udev->product); |
272 | kfree(udev->manufacturer); | |
273 | kfree(udev->serial); | |
274 | kfree(udev); | |
275 | } | |
276 | ||
4a9bee82 AS |
277 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
278 | { | |
279 | struct usb_device *usb_dev; | |
280 | ||
281 | usb_dev = to_usb_device(dev); | |
282 | ||
283 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
284 | return -ENOMEM; | |
285 | ||
286 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
287 | return -ENOMEM; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
645daaab AS |
292 | #ifdef CONFIG_PM |
293 | ||
f2189c47 AS |
294 | /* USB device Power-Management thunks. |
295 | * There's no need to distinguish here between quiescing a USB device | |
296 | * and powering it down; the generic_suspend() routine takes care of | |
297 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
298 | * USB interfaces there's no difference at all. | |
299 | */ | |
300 | ||
301 | static int usb_dev_prepare(struct device *dev) | |
302 | { | |
303 | return 0; /* Implement eventually? */ | |
304 | } | |
305 | ||
306 | static void usb_dev_complete(struct device *dev) | |
307 | { | |
308 | /* Currently used only for rebinding interfaces */ | |
98d9a82e | 309 | usb_resume_complete(dev); |
f2189c47 AS |
310 | } |
311 | ||
312 | static int usb_dev_suspend(struct device *dev) | |
313 | { | |
314 | return usb_suspend(dev, PMSG_SUSPEND); | |
315 | } | |
316 | ||
317 | static int usb_dev_resume(struct device *dev) | |
318 | { | |
65bfd296 | 319 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
320 | } |
321 | ||
322 | static int usb_dev_freeze(struct device *dev) | |
323 | { | |
324 | return usb_suspend(dev, PMSG_FREEZE); | |
325 | } | |
326 | ||
327 | static int usb_dev_thaw(struct device *dev) | |
328 | { | |
65bfd296 | 329 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
330 | } |
331 | ||
332 | static int usb_dev_poweroff(struct device *dev) | |
333 | { | |
334 | return usb_suspend(dev, PMSG_HIBERNATE); | |
335 | } | |
336 | ||
337 | static int usb_dev_restore(struct device *dev) | |
338 | { | |
65bfd296 | 339 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
340 | } |
341 | ||
47145210 | 342 | static const struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
343 | .prepare = usb_dev_prepare, |
344 | .complete = usb_dev_complete, | |
345 | .suspend = usb_dev_suspend, | |
346 | .resume = usb_dev_resume, | |
347 | .freeze = usb_dev_freeze, | |
348 | .thaw = usb_dev_thaw, | |
349 | .poweroff = usb_dev_poweroff, | |
350 | .restore = usb_dev_restore, | |
e1620d59 RW |
351 | .runtime_suspend = usb_runtime_suspend, |
352 | .runtime_resume = usb_runtime_resume, | |
353 | .runtime_idle = usb_runtime_idle, | |
f2189c47 AS |
354 | }; |
355 | ||
db063507 | 356 | #endif /* CONFIG_PM */ |
645daaab | 357 | |
f7a386c5 | 358 | |
3c2670e6 | 359 | static char *usb_devnode(struct device *dev, |
4e4098a3 | 360 | umode_t *mode, kuid_t *uid, kgid_t *gid) |
f7a386c5 KS |
361 | { |
362 | struct usb_device *usb_dev; | |
363 | ||
364 | usb_dev = to_usb_device(dev); | |
365 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
366 | usb_dev->bus->busnum, usb_dev->devnum); | |
367 | } | |
368 | ||
f2189c47 AS |
369 | struct device_type usb_device_type = { |
370 | .name = "usb_device", | |
371 | .release = usb_release_dev, | |
372 | .uevent = usb_dev_uevent, | |
e454cea2 | 373 | .devnode = usb_devnode, |
b409214c | 374 | #ifdef CONFIG_PM |
f2189c47 | 375 | .pm = &usb_device_pm_ops, |
b409214c | 376 | #endif |
f2189c47 AS |
377 | }; |
378 | ||
d7d07255 IPG |
379 | |
380 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
381 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
382 | { | |
383 | struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); | |
384 | return hcd->wireless; | |
385 | } | |
386 | ||
387 | ||
1da177e4 LT |
388 | /** |
389 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
390 | * @parent: hub to which device is connected; null to allocate a root hub | |
391 | * @bus: bus used to access the device | |
392 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 393 | * Context: !in_interrupt() |
1da177e4 LT |
394 | * |
395 | * Only hub drivers (including virtual root hub drivers for host | |
396 | * controllers) should ever call this. | |
397 | * | |
398 | * This call may not be used in a non-sleeping context. | |
626f090c YB |
399 | * |
400 | * Return: On success, a pointer to the allocated usb device. %NULL on | |
401 | * failure. | |
1da177e4 | 402 | */ |
2c044a48 GKH |
403 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
404 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
405 | { |
406 | struct usb_device *dev; | |
30b1e495 | 407 | struct usb_hcd *usb_hcd = bus_to_hcd(bus); |
d7d07255 | 408 | unsigned root_hub = 0; |
1da177e4 | 409 | |
0a1ef3b5 | 410 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
411 | if (!dev) |
412 | return NULL; | |
413 | ||
30b1e495 | 414 | if (!usb_get_hcd(usb_hcd)) { |
1da177e4 LT |
415 | kfree(dev); |
416 | return NULL; | |
417 | } | |
c6515272 SS |
418 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
419 | if (usb_hcd->driver->alloc_dev && parent && | |
420 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
421 | usb_put_hcd(bus_to_hcd(bus)); | |
422 | kfree(dev); | |
423 | return NULL; | |
424 | } | |
1da177e4 LT |
425 | |
426 | device_initialize(&dev->dev); | |
427 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 428 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 429 | dev->dev.groups = usb_device_groups; |
1da177e4 | 430 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 431 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 432 | dev->state = USB_STATE_ATTACHED; |
9cf65991 | 433 | dev->lpm_disable_count = 1; |
4d59d8a1 | 434 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
435 | |
436 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
437 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
438 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
439 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 440 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 441 | dev->can_submit = 1; |
1da177e4 LT |
442 | |
443 | /* Save readable and stable topology id, distinguishing devices | |
444 | * by location for diagnostics, tools, driver model, etc. The | |
445 | * string is a path along hub ports, from the root. Each device's | |
446 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 447 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
448 | * as stable: bus->busnum changes easily from modprobe order, |
449 | * cardbus or pci hotplugging, and so on. | |
450 | */ | |
9251644a ON |
451 | if (unlikely(!parent)) { |
452 | dev->devpath[0] = '0'; | |
7206b001 | 453 | dev->route = 0; |
1da177e4 LT |
454 | |
455 | dev->dev.parent = bus->controller; | |
0031a06e | 456 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 457 | root_hub = 1; |
1da177e4 LT |
458 | } else { |
459 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 460 | if (parent->devpath[0] == '0') { |
9251644a | 461 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 462 | "%d", port1); |
7206b001 SS |
463 | /* Root ports are not counted in route string */ |
464 | dev->route = 0; | |
465 | } else { | |
9251644a | 466 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 467 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
468 | /* Route string assumes hubs have less than 16 ports */ |
469 | if (port1 < 15) | |
470 | dev->route = parent->route + | |
471 | (port1 << ((parent->level - 1)*4)); | |
472 | else | |
473 | dev->route = parent->route + | |
474 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 475 | } |
1da177e4 LT |
476 | |
477 | dev->dev.parent = &parent->dev; | |
0031a06e | 478 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 LT |
479 | |
480 | /* hub driver sets up TT records */ | |
481 | } | |
482 | ||
12c3da34 | 483 | dev->portnum = port1; |
1da177e4 LT |
484 | dev->bus = bus; |
485 | dev->parent = parent; | |
486 | INIT_LIST_HEAD(&dev->filelist); | |
487 | ||
645daaab | 488 | #ifdef CONFIG_PM |
fcc4a01e AS |
489 | pm_runtime_set_autosuspend_delay(&dev->dev, |
490 | usb_autosuspend_delay * 1000); | |
15123006 SS |
491 | dev->connect_time = jiffies; |
492 | dev->active_duration = -jiffies; | |
645daaab | 493 | #endif |
d7d07255 IPG |
494 | if (root_hub) /* Root hub always ok [and always wired] */ |
495 | dev->authorized = 1; | |
496 | else { | |
497 | dev->authorized = usb_hcd->authorized_default; | |
469271f8 | 498 | dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0; |
d7d07255 | 499 | } |
1da177e4 LT |
500 | return dev; |
501 | } | |
caa67a5e | 502 | EXPORT_SYMBOL_GPL(usb_alloc_dev); |
1da177e4 LT |
503 | |
504 | /** | |
505 | * usb_get_dev - increments the reference count of the usb device structure | |
506 | * @dev: the device being referenced | |
507 | * | |
508 | * Each live reference to a device should be refcounted. | |
509 | * | |
510 | * Drivers for USB interfaces should normally record such references in | |
511 | * their probe() methods, when they bind to an interface, and release | |
512 | * them by calling usb_put_dev(), in their disconnect() methods. | |
513 | * | |
626f090c | 514 | * Return: A pointer to the device with the incremented reference counter. |
1da177e4 LT |
515 | */ |
516 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
517 | { | |
518 | if (dev) | |
519 | get_device(&dev->dev); | |
520 | return dev; | |
521 | } | |
782e70c6 | 522 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
523 | |
524 | /** | |
525 | * usb_put_dev - release a use of the usb device structure | |
526 | * @dev: device that's been disconnected | |
527 | * | |
528 | * Must be called when a user of a device is finished with it. When the last | |
529 | * user of the device calls this function, the memory of the device is freed. | |
530 | */ | |
531 | void usb_put_dev(struct usb_device *dev) | |
532 | { | |
533 | if (dev) | |
534 | put_device(&dev->dev); | |
535 | } | |
782e70c6 | 536 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
537 | |
538 | /** | |
539 | * usb_get_intf - increments the reference count of the usb interface structure | |
540 | * @intf: the interface being referenced | |
541 | * | |
542 | * Each live reference to a interface must be refcounted. | |
543 | * | |
544 | * Drivers for USB interfaces should normally record such references in | |
545 | * their probe() methods, when they bind to an interface, and release | |
546 | * them by calling usb_put_intf(), in their disconnect() methods. | |
547 | * | |
626f090c | 548 | * Return: A pointer to the interface with the incremented reference counter. |
1da177e4 LT |
549 | */ |
550 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
551 | { | |
552 | if (intf) | |
553 | get_device(&intf->dev); | |
554 | return intf; | |
555 | } | |
782e70c6 | 556 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
557 | |
558 | /** | |
559 | * usb_put_intf - release a use of the usb interface structure | |
560 | * @intf: interface that's been decremented | |
561 | * | |
562 | * Must be called when a user of an interface is finished with it. When the | |
563 | * last user of the interface calls this function, the memory of the interface | |
564 | * is freed. | |
565 | */ | |
566 | void usb_put_intf(struct usb_interface *intf) | |
567 | { | |
568 | if (intf) | |
569 | put_device(&intf->dev); | |
570 | } | |
782e70c6 | 571 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
572 | |
573 | /* USB device locking | |
574 | * | |
9ad3d6cc AS |
575 | * USB devices and interfaces are locked using the semaphore in their |
576 | * embedded struct device. The hub driver guarantees that whenever a | |
577 | * device is connected or disconnected, drivers are called with the | |
578 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
579 | * |
580 | * Complications arise when several devices are to be locked at the same | |
581 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
582 | * do this; nobody else needs to worry about it. The rule for locking |
583 | * is simple: | |
1da177e4 LT |
584 | * |
585 | * When locking both a device and its parent, always lock the | |
586 | * the parent first. | |
587 | */ | |
588 | ||
1da177e4 | 589 | /** |
d0bcabcd | 590 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
591 | * @udev: device that's being locked |
592 | * @iface: interface bound to the driver making the request (optional) | |
593 | * | |
594 | * Attempts to acquire the device lock, but fails if the device is | |
595 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
596 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
597 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
598 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 599 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 600 | * |
626f090c | 601 | * Return: A negative error code for failure, otherwise 0. |
1da177e4 LT |
602 | */ |
603 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 604 | const struct usb_interface *iface) |
1da177e4 | 605 | { |
3ea15966 AS |
606 | unsigned long jiffies_expire = jiffies + HZ; |
607 | ||
1da177e4 LT |
608 | if (udev->state == USB_STATE_NOTATTACHED) |
609 | return -ENODEV; | |
610 | if (udev->state == USB_STATE_SUSPENDED) | |
611 | return -EHOSTUNREACH; | |
011b15df AS |
612 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
613 | iface->condition == USB_INTERFACE_UNBOUND)) | |
614 | return -EINTR; | |
1da177e4 | 615 | |
3142788b | 616 | while (!usb_trylock_device(udev)) { |
3ea15966 AS |
617 | |
618 | /* If we can't acquire the lock after waiting one second, | |
619 | * we're probably deadlocked */ | |
620 | if (time_after(jiffies, jiffies_expire)) | |
621 | return -EBUSY; | |
622 | ||
1da177e4 LT |
623 | msleep(15); |
624 | if (udev->state == USB_STATE_NOTATTACHED) | |
625 | return -ENODEV; | |
626 | if (udev->state == USB_STATE_SUSPENDED) | |
627 | return -EHOSTUNREACH; | |
011b15df AS |
628 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
629 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
630 | return -EINTR; |
631 | } | |
011b15df | 632 | return 0; |
1da177e4 | 633 | } |
782e70c6 | 634 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 | 635 | |
1da177e4 LT |
636 | /** |
637 | * usb_get_current_frame_number - return current bus frame number | |
638 | * @dev: the device whose bus is being queried | |
639 | * | |
626f090c YB |
640 | * Return: The current frame number for the USB host controller used |
641 | * with the given USB device. This can be used when scheduling | |
1da177e4 LT |
642 | * isochronous requests. |
643 | * | |
626f090c YB |
644 | * Note: Different kinds of host controller have different "scheduling |
645 | * horizons". While one type might support scheduling only 32 frames | |
646 | * into the future, others could support scheduling up to 1024 frames | |
647 | * into the future. | |
648 | * | |
1da177e4 LT |
649 | */ |
650 | int usb_get_current_frame_number(struct usb_device *dev) | |
651 | { | |
9251644a | 652 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 653 | } |
782e70c6 | 654 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
655 | |
656 | /*-------------------------------------------------------------------*/ | |
657 | /* | |
658 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
659 | * extra field of the interface and endpoint descriptor structs. | |
660 | */ | |
661 | ||
662 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 663 | unsigned char type, void **ptr) |
1da177e4 LT |
664 | { |
665 | struct usb_descriptor_header *header; | |
666 | ||
667 | while (size >= sizeof(struct usb_descriptor_header)) { | |
668 | header = (struct usb_descriptor_header *)buffer; | |
669 | ||
670 | if (header->bLength < 2) { | |
671 | printk(KERN_ERR | |
672 | "%s: bogus descriptor, type %d length %d\n", | |
673 | usbcore_name, | |
2c044a48 | 674 | header->bDescriptorType, |
1da177e4 LT |
675 | header->bLength); |
676 | return -1; | |
677 | } | |
678 | ||
679 | if (header->bDescriptorType == type) { | |
680 | *ptr = header; | |
681 | return 0; | |
682 | } | |
683 | ||
684 | buffer += header->bLength; | |
685 | size -= header->bLength; | |
686 | } | |
687 | return -1; | |
688 | } | |
782e70c6 | 689 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
690 | |
691 | /** | |
073900a2 | 692 | * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
1da177e4 LT |
693 | * @dev: device the buffer will be used with |
694 | * @size: requested buffer size | |
695 | * @mem_flags: affect whether allocation may block | |
696 | * @dma: used to return DMA address of buffer | |
697 | * | |
626f090c YB |
698 | * Return: Either null (indicating no buffer could be allocated), or the |
699 | * cpu-space pointer to a buffer that may be used to perform DMA to the | |
1da177e4 LT |
700 | * specified device. Such cpu-space buffers are returned along with the DMA |
701 | * address (through the pointer provided). | |
702 | * | |
626f090c | 703 | * Note: |
1da177e4 | 704 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
fbf54dd3 DB |
705 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
706 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 707 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
708 | * Using these buffers also eliminates cacheline sharing problems on |
709 | * architectures where CPU caches are not DMA-coherent. On systems without | |
710 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 | 711 | * |
073900a2 | 712 | * When the buffer is no longer used, free it with usb_free_coherent(). |
1da177e4 | 713 | */ |
073900a2 DM |
714 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags, |
715 | dma_addr_t *dma) | |
1da177e4 | 716 | { |
a6d2bb9f | 717 | if (!dev || !dev->bus) |
1da177e4 | 718 | return NULL; |
9251644a | 719 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 720 | } |
073900a2 | 721 | EXPORT_SYMBOL_GPL(usb_alloc_coherent); |
1da177e4 LT |
722 | |
723 | /** | |
073900a2 | 724 | * usb_free_coherent - free memory allocated with usb_alloc_coherent() |
1da177e4 LT |
725 | * @dev: device the buffer was used with |
726 | * @size: requested buffer size | |
727 | * @addr: CPU address of buffer | |
728 | * @dma: DMA address of buffer | |
729 | * | |
730 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
073900a2 | 731 | * been allocated using usb_alloc_coherent(), and the parameters must match |
fbf54dd3 | 732 | * those provided in that allocation request. |
1da177e4 | 733 | */ |
073900a2 DM |
734 | void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, |
735 | dma_addr_t dma) | |
1da177e4 | 736 | { |
a6d2bb9f | 737 | if (!dev || !dev->bus) |
b94badbb DT |
738 | return; |
739 | if (!addr) | |
740 | return; | |
9251644a | 741 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 742 | } |
073900a2 | 743 | EXPORT_SYMBOL_GPL(usb_free_coherent); |
1da177e4 LT |
744 | |
745 | /** | |
746 | * usb_buffer_map - create DMA mapping(s) for an urb | |
747 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
748 | * | |
626f090c YB |
749 | * URB_NO_TRANSFER_DMA_MAP is added to urb->transfer_flags if the operation |
750 | * succeeds. If the device is connected to this system through a non-DMA | |
751 | * controller, this operation always succeeds. | |
1da177e4 LT |
752 | * |
753 | * This call would normally be used for an urb which is reused, perhaps | |
754 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
755 | * calls to synchronize memory and dma state. | |
756 | * | |
757 | * Reverse the effect of this call with usb_buffer_unmap(). | |
626f090c YB |
758 | * |
759 | * Return: Either %NULL (indicating no buffer could be mapped), or @urb. | |
760 | * | |
1da177e4 LT |
761 | */ |
762 | #if 0 | |
9251644a | 763 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
764 | { |
765 | struct usb_bus *bus; | |
766 | struct device *controller; | |
767 | ||
768 | if (!urb | |
769 | || !urb->dev | |
770 | || !(bus = urb->dev->bus) | |
771 | || !(controller = bus->controller)) | |
772 | return NULL; | |
773 | ||
774 | if (controller->dma_mask) { | |
9251644a | 775 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 776 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 777 | usb_pipein(urb->pipe) |
1da177e4 | 778 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
2c044a48 GKH |
779 | /* FIXME generic api broken like pci, can't report errors */ |
780 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
781 | } else |
782 | urb->transfer_dma = ~0; | |
0ede76fc | 783 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
1da177e4 LT |
784 | return urb; |
785 | } | |
782e70c6 | 786 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
787 | #endif /* 0 */ |
788 | ||
789 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
790 | * XXX please determine whether the sync is to transfer ownership of | |
791 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
792 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
793 | */ | |
794 | #if 0 | |
795 | ||
796 | /** | |
797 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
798 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
799 | */ | |
9251644a | 800 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
801 | { |
802 | struct usb_bus *bus; | |
803 | struct device *controller; | |
804 | ||
805 | if (!urb | |
806 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
807 | || !urb->dev | |
808 | || !(bus = urb->dev->bus) | |
809 | || !(controller = bus->controller)) | |
810 | return; | |
811 | ||
812 | if (controller->dma_mask) { | |
9b8e7ba6 | 813 | dma_sync_single_for_cpu(controller, |
1da177e4 | 814 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 815 | usb_pipein(urb->pipe) |
1da177e4 | 816 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 817 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 818 | dma_sync_single_for_cpu(controller, |
1da177e4 | 819 | urb->setup_dma, |
9251644a | 820 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
821 | DMA_TO_DEVICE); |
822 | } | |
823 | } | |
782e70c6 | 824 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
825 | #endif |
826 | ||
827 | /** | |
828 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
829 | * @urb: urb whose transfer_buffer will be unmapped | |
830 | * | |
831 | * Reverses the effect of usb_buffer_map(). | |
832 | */ | |
833 | #if 0 | |
9251644a | 834 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
835 | { |
836 | struct usb_bus *bus; | |
837 | struct device *controller; | |
838 | ||
839 | if (!urb | |
840 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
841 | || !urb->dev | |
842 | || !(bus = urb->dev->bus) | |
843 | || !(controller = bus->controller)) | |
844 | return; | |
845 | ||
846 | if (controller->dma_mask) { | |
9251644a | 847 | dma_unmap_single(controller, |
1da177e4 | 848 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 849 | usb_pipein(urb->pipe) |
1da177e4 | 850 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 851 | } |
0ede76fc | 852 | urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP; |
1da177e4 | 853 | } |
782e70c6 | 854 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
855 | #endif /* 0 */ |
856 | ||
ff9c895f | 857 | #if 0 |
1da177e4 LT |
858 | /** |
859 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
860 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 861 | * @is_in: mapping transfer direction |
1da177e4 LT |
862 | * @sg: the scatterlist to map |
863 | * @nents: the number of entries in the scatterlist | |
864 | * | |
626f090c YB |
865 | * Return: Either < 0 (indicating no buffers could be mapped), or the |
866 | * number of DMA mapping array entries in the scatterlist. | |
1da177e4 | 867 | * |
626f090c | 868 | * Note: |
1da177e4 LT |
869 | * The caller is responsible for placing the resulting DMA addresses from |
870 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
871 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
872 | * | |
873 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
874 | * to complete before starting the next I/O. This is particularly easy | |
875 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
876 | * mapping entry returned, stopping on the first error or when all succeed. | |
877 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
878 | * | |
879 | * This call would normally be used when translating scatterlist requests, | |
880 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
881 | * may be able to coalesce mappings for improved I/O efficiency. | |
882 | * | |
883 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
884 | */ | |
5e60a161 | 885 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 886 | struct scatterlist *sg, int nents) |
1da177e4 LT |
887 | { |
888 | struct usb_bus *bus; | |
889 | struct device *controller; | |
890 | ||
891 | if (!dev | |
1da177e4 LT |
892 | || !(bus = dev->bus) |
893 | || !(controller = bus->controller) | |
894 | || !controller->dma_mask) | |
2912282c | 895 | return -EINVAL; |
1da177e4 | 896 | |
2c044a48 | 897 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 898 | return dma_map_sg(controller, sg, nents, |
2912282c | 899 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 900 | } |
782e70c6 | 901 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
ff9c895f | 902 | #endif |
1da177e4 LT |
903 | |
904 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
905 | * XXX please determine whether the sync is to transfer ownership of | |
906 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
907 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
908 | */ | |
909 | #if 0 | |
910 | ||
911 | /** | |
912 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
913 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 914 | * @is_in: mapping transfer direction |
1da177e4 LT |
915 | * @sg: the scatterlist to synchronize |
916 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
917 | * | |
918 | * Use this when you are re-using a scatterlist's data buffers for | |
919 | * another USB request. | |
920 | */ | |
5e60a161 | 921 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 922 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
923 | { |
924 | struct usb_bus *bus; | |
925 | struct device *controller; | |
926 | ||
927 | if (!dev | |
928 | || !(bus = dev->bus) | |
929 | || !(controller = bus->controller) | |
930 | || !controller->dma_mask) | |
931 | return; | |
932 | ||
9b8e7ba6 FT |
933 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
934 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 935 | } |
782e70c6 | 936 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
937 | #endif |
938 | ||
ff9c895f | 939 | #if 0 |
1da177e4 LT |
940 | /** |
941 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
942 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 943 | * @is_in: mapping transfer direction |
1da177e4 LT |
944 | * @sg: the scatterlist to unmap |
945 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
946 | * | |
947 | * Reverses the effect of usb_buffer_map_sg(). | |
948 | */ | |
5e60a161 | 949 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 950 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
951 | { |
952 | struct usb_bus *bus; | |
953 | struct device *controller; | |
954 | ||
955 | if (!dev | |
956 | || !(bus = dev->bus) | |
957 | || !(controller = bus->controller) | |
958 | || !controller->dma_mask) | |
959 | return; | |
960 | ||
9251644a | 961 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 962 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 963 | } |
782e70c6 | 964 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
ff9c895f | 965 | #endif |
1da177e4 | 966 | |
785895ff RR |
967 | /* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */ |
968 | #ifdef MODULE | |
969 | module_param(nousb, bool, 0444); | |
970 | #else | |
971 | core_param(nousb, nousb, bool, 0444); | |
972 | #endif | |
1da177e4 LT |
973 | |
974 | /* | |
975 | * for external read access to <nousb> | |
976 | */ | |
977 | int usb_disabled(void) | |
978 | { | |
979 | return nousb; | |
980 | } | |
782e70c6 | 981 | EXPORT_SYMBOL_GPL(usb_disabled); |
1da177e4 | 982 | |
3b23dd6f AS |
983 | /* |
984 | * Notifications of device and interface registration | |
985 | */ | |
986 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
987 | void *data) | |
988 | { | |
989 | struct device *dev = data; | |
990 | ||
991 | switch (action) { | |
992 | case BUS_NOTIFY_ADD_DEVICE: | |
993 | if (dev->type == &usb_device_type) | |
994 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
995 | else if (dev->type == &usb_if_device_type) | |
643de624 | 996 | usb_create_sysfs_intf_files(to_usb_interface(dev)); |
3b23dd6f AS |
997 | break; |
998 | ||
999 | case BUS_NOTIFY_DEL_DEVICE: | |
1000 | if (dev->type == &usb_device_type) | |
1001 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
1002 | else if (dev->type == &usb_if_device_type) | |
1003 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
1004 | break; | |
1005 | } | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static struct notifier_block usb_bus_nb = { | |
1010 | .notifier_call = usb_bus_notify, | |
1011 | }; | |
1012 | ||
00048b8b GKH |
1013 | struct dentry *usb_debug_root; |
1014 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
1015 | ||
719a6e88 | 1016 | static struct dentry *usb_debug_devices; |
97d7b7a4 | 1017 | |
00048b8b GKH |
1018 | static int usb_debugfs_init(void) |
1019 | { | |
1020 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
1021 | if (!usb_debug_root) | |
1022 | return -ENOENT; | |
97d7b7a4 GKH |
1023 | |
1024 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
1025 | usb_debug_root, NULL, | |
1026 | &usbfs_devices_fops); | |
1027 | if (!usb_debug_devices) { | |
1028 | debugfs_remove(usb_debug_root); | |
1029 | usb_debug_root = NULL; | |
1030 | return -ENOENT; | |
1031 | } | |
1032 | ||
00048b8b GKH |
1033 | return 0; |
1034 | } | |
1035 | ||
1036 | static void usb_debugfs_cleanup(void) | |
1037 | { | |
97d7b7a4 | 1038 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1039 | debugfs_remove(usb_debug_root); |
1040 | } | |
1041 | ||
1da177e4 LT |
1042 | /* |
1043 | * Init | |
1044 | */ | |
1045 | static int __init usb_init(void) | |
1046 | { | |
1047 | int retval; | |
1da47f54 | 1048 | if (usb_disabled()) { |
9251644a | 1049 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1050 | return 0; |
1051 | } | |
5efd2ea8 | 1052 | usb_init_pool_max(); |
1da177e4 | 1053 | |
00048b8b GKH |
1054 | retval = usb_debugfs_init(); |
1055 | if (retval) | |
1056 | goto out; | |
1057 | ||
ea79c2ed | 1058 | usb_acpi_register(); |
1da177e4 | 1059 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1060 | if (retval) |
bd859281 | 1061 | goto bus_register_failed; |
3b23dd6f AS |
1062 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1063 | if (retval) | |
1064 | goto bus_notifier_failed; | |
1da177e4 LT |
1065 | retval = usb_major_init(); |
1066 | if (retval) | |
1067 | goto major_init_failed; | |
fbf82fd2 KS |
1068 | retval = usb_register(&usbfs_driver); |
1069 | if (retval) | |
1070 | goto driver_register_failed; | |
9f8b17e6 | 1071 | retval = usb_devio_init(); |
fbf82fd2 | 1072 | if (retval) |
9f8b17e6 | 1073 | goto usb_devio_init_failed; |
1da177e4 LT |
1074 | retval = usb_hub_init(); |
1075 | if (retval) | |
1076 | goto hub_init_failed; | |
8bb54ab5 | 1077 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1078 | if (!retval) |
1079 | goto out; | |
1080 | ||
1081 | usb_hub_cleanup(); | |
1082 | hub_init_failed: | |
9f8b17e6 KS |
1083 | usb_devio_cleanup(); |
1084 | usb_devio_init_failed: | |
fbf82fd2 KS |
1085 | usb_deregister(&usbfs_driver); |
1086 | driver_register_failed: | |
1087 | usb_major_cleanup(); | |
1da177e4 | 1088 | major_init_failed: |
3b23dd6f AS |
1089 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1090 | bus_notifier_failed: | |
1da177e4 | 1091 | bus_unregister(&usb_bus_type); |
bd859281 | 1092 | bus_register_failed: |
da0af6e7 | 1093 | usb_acpi_unregister(); |
9bbdf1e0 | 1094 | usb_debugfs_cleanup(); |
1da177e4 LT |
1095 | out: |
1096 | return retval; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Cleanup | |
1101 | */ | |
1102 | static void __exit usb_exit(void) | |
1103 | { | |
1104 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1da47f54 | 1105 | if (usb_disabled()) |
1da177e4 LT |
1106 | return; |
1107 | ||
8bb54ab5 | 1108 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 | 1109 | usb_major_cleanup(); |
fbf82fd2 | 1110 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1111 | usb_devio_cleanup(); |
1da177e4 | 1112 | usb_hub_cleanup(); |
3b23dd6f | 1113 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1114 | bus_unregister(&usb_bus_type); |
da0af6e7 | 1115 | usb_acpi_unregister(); |
00048b8b | 1116 | usb_debugfs_cleanup(); |
1da177e4 LT |
1117 | } |
1118 | ||
1119 | subsys_initcall(usb_init); | |
1120 | module_exit(usb_exit); | |
1da177e4 | 1121 | MODULE_LICENSE("GPL"); |