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> |
69bec725 | 39 | #include <linux/usb/of.h> |
1da177e4 LT |
40 | |
41 | #include <asm/io.h> | |
87ae9afd | 42 | #include <linux/scatterlist.h> |
1da177e4 LT |
43 | #include <linux/mm.h> |
44 | #include <linux/dma-mapping.h> | |
45 | ||
1da177e4 LT |
46 | #include "usb.h" |
47 | ||
1da177e4 LT |
48 | |
49 | const char *usbcore_name = "usbcore"; | |
50 | ||
90ab5ee9 | 51 | static bool nousb; /* Disable USB when built into kernel image */ |
1da177e4 | 52 | |
bb3247a3 | 53 | module_param(nousb, bool, 0444); |
bb3247a3 VK |
54 | |
55 | /* | |
56 | * for external read access to <nousb> | |
57 | */ | |
58 | int usb_disabled(void) | |
59 | { | |
60 | return nousb; | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(usb_disabled); | |
63 | ||
ceb6c9c8 | 64 | #ifdef CONFIG_PM |
b5e795f8 AS |
65 | static int usb_autosuspend_delay = 2; /* Default delay value, |
66 | * in seconds */ | |
eaafbc3a | 67 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
68 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
69 | ||
70 | #else | |
71 | #define usb_autosuspend_delay 0 | |
72 | #endif | |
73 | ||
1da177e4 | 74 | |
91017f9c SS |
75 | /** |
76 | * usb_find_alt_setting() - Given a configuration, find the alternate setting | |
77 | * for the given interface. | |
70445ae6 RD |
78 | * @config: the configuration to search (not necessarily the current config). |
79 | * @iface_num: interface number to search in | |
80 | * @alt_num: alternate interface setting number to search for. | |
91017f9c SS |
81 | * |
82 | * Search the configuration's interface cache for the given alt setting. | |
626f090c YB |
83 | * |
84 | * Return: The alternate setting, if found. %NULL otherwise. | |
91017f9c SS |
85 | */ |
86 | struct usb_host_interface *usb_find_alt_setting( | |
87 | struct usb_host_config *config, | |
88 | unsigned int iface_num, | |
89 | unsigned int alt_num) | |
90 | { | |
91 | struct usb_interface_cache *intf_cache = NULL; | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
95 | if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber | |
96 | == iface_num) { | |
97 | intf_cache = config->intf_cache[i]; | |
98 | break; | |
99 | } | |
100 | } | |
101 | if (!intf_cache) | |
102 | return NULL; | |
103 | for (i = 0; i < intf_cache->num_altsetting; i++) | |
104 | if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) | |
105 | return &intf_cache->altsetting[i]; | |
106 | ||
107 | printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " | |
108 | "config %u\n", alt_num, iface_num, | |
109 | config->desc.bConfigurationValue); | |
110 | return NULL; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(usb_find_alt_setting); | |
113 | ||
1da177e4 LT |
114 | /** |
115 | * usb_ifnum_to_if - get the interface object with a given interface number | |
116 | * @dev: the device whose current configuration is considered | |
117 | * @ifnum: the desired interface | |
118 | * | |
119 | * This walks the device descriptor for the currently active configuration | |
626f090c | 120 | * to find the interface object with the particular interface number. |
1da177e4 LT |
121 | * |
122 | * Note that configuration descriptors are not required to assign interface | |
123 | * numbers sequentially, so that it would be incorrect to assume that | |
124 | * the first interface in that descriptor corresponds to interface zero. | |
125 | * This routine helps device drivers avoid such mistakes. | |
126 | * However, you should make sure that you do the right thing with any | |
127 | * alternate settings available for this interfaces. | |
128 | * | |
129 | * Don't call this function unless you are bound to one of the interfaces | |
130 | * on this device or you have locked the device! | |
626f090c YB |
131 | * |
132 | * Return: A pointer to the interface that has @ifnum as interface number, | |
133 | * if found. %NULL otherwise. | |
1da177e4 | 134 | */ |
095bc335 LFC |
135 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
136 | unsigned ifnum) | |
1da177e4 LT |
137 | { |
138 | struct usb_host_config *config = dev->actconfig; | |
139 | int i; | |
140 | ||
141 | if (!config) | |
142 | return NULL; | |
143 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
144 | if (config->interface[i]->altsetting[0] | |
145 | .desc.bInterfaceNumber == ifnum) | |
146 | return config->interface[i]; | |
147 | ||
148 | return NULL; | |
149 | } | |
782e70c6 | 150 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
151 | |
152 | /** | |
d0bcabcd | 153 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
154 | * @intf: the interface containing the altsetting in question |
155 | * @altnum: the desired alternate setting number | |
156 | * | |
157 | * This searches the altsetting array of the specified interface for | |
626f090c | 158 | * an entry with the correct bAlternateSetting value. |
1da177e4 LT |
159 | * |
160 | * Note that altsettings need not be stored sequentially by number, so | |
161 | * it would be incorrect to assume that the first altsetting entry in | |
162 | * the array corresponds to altsetting zero. This routine helps device | |
163 | * drivers avoid such mistakes. | |
164 | * | |
165 | * Don't call this function unless you are bound to the intf interface | |
166 | * or you have locked the device! | |
626f090c YB |
167 | * |
168 | * Return: A pointer to the entry of the altsetting array of @intf that | |
169 | * has @altnum as the alternate setting number. %NULL if not found. | |
1da177e4 | 170 | */ |
2c044a48 GKH |
171 | struct usb_host_interface *usb_altnum_to_altsetting( |
172 | const struct usb_interface *intf, | |
173 | unsigned int altnum) | |
1da177e4 LT |
174 | { |
175 | int i; | |
176 | ||
177 | for (i = 0; i < intf->num_altsetting; i++) { | |
178 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
179 | return &intf->altsetting[i]; | |
180 | } | |
181 | return NULL; | |
182 | } | |
782e70c6 | 183 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 184 | |
ab7cd8c7 GKH |
185 | struct find_interface_arg { |
186 | int minor; | |
c2d284ee | 187 | struct device_driver *drv; |
ab7cd8c7 GKH |
188 | }; |
189 | ||
2c044a48 | 190 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 191 | { |
ab7cd8c7 | 192 | struct find_interface_arg *arg = data; |
f5691d70 | 193 | struct usb_interface *intf; |
6034a080 | 194 | |
55129666 | 195 | if (!is_usb_interface(dev)) |
6034a080 | 196 | return 0; |
197 | ||
c2d284ee RD |
198 | if (dev->driver != arg->drv) |
199 | return 0; | |
6034a080 | 200 | intf = to_usb_interface(dev); |
c2d284ee | 201 | return intf->minor == arg->minor; |
6034a080 | 202 | } |
203 | ||
1da177e4 LT |
204 | /** |
205 | * usb_find_interface - find usb_interface pointer for driver and device | |
206 | * @drv: the driver whose current configuration is considered | |
207 | * @minor: the minor number of the desired device | |
208 | * | |
a2582bd4 | 209 | * This walks the bus device list and returns a pointer to the interface |
c2d284ee RD |
210 | * with the matching minor and driver. Note, this only works for devices |
211 | * that share the USB major number. | |
626f090c YB |
212 | * |
213 | * Return: A pointer to the interface with the matching major and @minor. | |
1da177e4 LT |
214 | */ |
215 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
216 | { | |
ab7cd8c7 | 217 | struct find_interface_arg argb; |
a2582bd4 RD |
218 | struct device *dev; |
219 | ||
ab7cd8c7 | 220 | argb.minor = minor; |
c2d284ee RD |
221 | argb.drv = &drv->drvwrap.driver; |
222 | ||
223 | dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); | |
a2582bd4 RD |
224 | |
225 | /* Drop reference count from bus_find_device */ | |
226 | put_device(dev); | |
227 | ||
228 | return dev ? to_usb_interface(dev) : NULL; | |
1da177e4 | 229 | } |
782e70c6 | 230 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 231 | |
9b790915 JW |
232 | struct each_dev_arg { |
233 | void *data; | |
234 | int (*fn)(struct usb_device *, void *); | |
235 | }; | |
236 | ||
237 | static int __each_dev(struct device *dev, void *data) | |
238 | { | |
239 | struct each_dev_arg *arg = (struct each_dev_arg *)data; | |
240 | ||
241 | /* There are struct usb_interface on the same bus, filter them out */ | |
242 | if (!is_usb_device(dev)) | |
243 | return 0; | |
244 | ||
69ab55d7 | 245 | return arg->fn(to_usb_device(dev), arg->data); |
9b790915 JW |
246 | } |
247 | ||
248 | /** | |
249 | * usb_for_each_dev - iterate over all USB devices in the system | |
250 | * @data: data pointer that will be handed to the callback function | |
251 | * @fn: callback function to be called for each USB device | |
252 | * | |
253 | * Iterate over all USB devices and call @fn for each, passing it @data. If it | |
254 | * returns anything other than 0, we break the iteration prematurely and return | |
255 | * that value. | |
256 | */ | |
257 | int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)) | |
258 | { | |
259 | struct each_dev_arg arg = {data, fn}; | |
260 | ||
261 | return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev); | |
262 | } | |
263 | EXPORT_SYMBOL_GPL(usb_for_each_dev); | |
264 | ||
1da177e4 LT |
265 | /** |
266 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
267 | * @dev: device that's been disconnected | |
268 | * | |
269 | * Will be called only by the device core when all users of this usb device are | |
270 | * done. | |
271 | */ | |
272 | static void usb_release_dev(struct device *dev) | |
273 | { | |
274 | struct usb_device *udev; | |
c6515272 | 275 | struct usb_hcd *hcd; |
1da177e4 LT |
276 | |
277 | udev = to_usb_device(dev); | |
c6515272 | 278 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
279 | |
280 | usb_destroy_configuration(udev); | |
3148bf04 | 281 | usb_release_bos_descriptor(udev); |
c6515272 | 282 | usb_put_hcd(hcd); |
1da177e4 LT |
283 | kfree(udev->product); |
284 | kfree(udev->manufacturer); | |
285 | kfree(udev->serial); | |
286 | kfree(udev); | |
287 | } | |
288 | ||
4a9bee82 AS |
289 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
290 | { | |
291 | struct usb_device *usb_dev; | |
292 | ||
293 | usb_dev = to_usb_device(dev); | |
294 | ||
295 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
296 | return -ENOMEM; | |
297 | ||
298 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
299 | return -ENOMEM; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
645daaab AS |
304 | #ifdef CONFIG_PM |
305 | ||
f2189c47 AS |
306 | /* USB device Power-Management thunks. |
307 | * There's no need to distinguish here between quiescing a USB device | |
308 | * and powering it down; the generic_suspend() routine takes care of | |
309 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
310 | * USB interfaces there's no difference at all. | |
311 | */ | |
312 | ||
313 | static int usb_dev_prepare(struct device *dev) | |
314 | { | |
9be427ef | 315 | return 0; /* Implement eventually? */ |
f2189c47 AS |
316 | } |
317 | ||
318 | static void usb_dev_complete(struct device *dev) | |
319 | { | |
320 | /* Currently used only for rebinding interfaces */ | |
98d9a82e | 321 | usb_resume_complete(dev); |
f2189c47 AS |
322 | } |
323 | ||
324 | static int usb_dev_suspend(struct device *dev) | |
325 | { | |
326 | return usb_suspend(dev, PMSG_SUSPEND); | |
327 | } | |
328 | ||
329 | static int usb_dev_resume(struct device *dev) | |
330 | { | |
65bfd296 | 331 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
332 | } |
333 | ||
334 | static int usb_dev_freeze(struct device *dev) | |
335 | { | |
336 | return usb_suspend(dev, PMSG_FREEZE); | |
337 | } | |
338 | ||
339 | static int usb_dev_thaw(struct device *dev) | |
340 | { | |
65bfd296 | 341 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
342 | } |
343 | ||
344 | static int usb_dev_poweroff(struct device *dev) | |
345 | { | |
346 | return usb_suspend(dev, PMSG_HIBERNATE); | |
347 | } | |
348 | ||
349 | static int usb_dev_restore(struct device *dev) | |
350 | { | |
65bfd296 | 351 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
352 | } |
353 | ||
47145210 | 354 | static const struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
355 | .prepare = usb_dev_prepare, |
356 | .complete = usb_dev_complete, | |
357 | .suspend = usb_dev_suspend, | |
358 | .resume = usb_dev_resume, | |
359 | .freeze = usb_dev_freeze, | |
360 | .thaw = usb_dev_thaw, | |
361 | .poweroff = usb_dev_poweroff, | |
362 | .restore = usb_dev_restore, | |
e1620d59 RW |
363 | .runtime_suspend = usb_runtime_suspend, |
364 | .runtime_resume = usb_runtime_resume, | |
365 | .runtime_idle = usb_runtime_idle, | |
f2189c47 AS |
366 | }; |
367 | ||
db063507 | 368 | #endif /* CONFIG_PM */ |
645daaab | 369 | |
f7a386c5 | 370 | |
3c2670e6 | 371 | static char *usb_devnode(struct device *dev, |
4e4098a3 | 372 | umode_t *mode, kuid_t *uid, kgid_t *gid) |
f7a386c5 KS |
373 | { |
374 | struct usb_device *usb_dev; | |
375 | ||
376 | usb_dev = to_usb_device(dev); | |
377 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
378 | usb_dev->bus->busnum, usb_dev->devnum); | |
379 | } | |
380 | ||
f2189c47 AS |
381 | struct device_type usb_device_type = { |
382 | .name = "usb_device", | |
383 | .release = usb_release_dev, | |
384 | .uevent = usb_dev_uevent, | |
e454cea2 | 385 | .devnode = usb_devnode, |
b409214c | 386 | #ifdef CONFIG_PM |
f2189c47 | 387 | .pm = &usb_device_pm_ops, |
b409214c | 388 | #endif |
f2189c47 AS |
389 | }; |
390 | ||
d7d07255 IPG |
391 | |
392 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
393 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
394 | { | |
6ae706ae | 395 | struct usb_hcd *hcd = bus_to_hcd(bus); |
d7d07255 IPG |
396 | return hcd->wireless; |
397 | } | |
398 | ||
399 | ||
1da177e4 LT |
400 | /** |
401 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
402 | * @parent: hub to which device is connected; null to allocate a root hub | |
403 | * @bus: bus used to access the device | |
404 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 405 | * Context: !in_interrupt() |
1da177e4 LT |
406 | * |
407 | * Only hub drivers (including virtual root hub drivers for host | |
408 | * controllers) should ever call this. | |
409 | * | |
410 | * This call may not be used in a non-sleeping context. | |
626f090c YB |
411 | * |
412 | * Return: On success, a pointer to the allocated usb device. %NULL on | |
413 | * failure. | |
1da177e4 | 414 | */ |
2c044a48 GKH |
415 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
416 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
417 | { |
418 | struct usb_device *dev; | |
30b1e495 | 419 | struct usb_hcd *usb_hcd = bus_to_hcd(bus); |
d7d07255 | 420 | unsigned root_hub = 0; |
7222c832 | 421 | unsigned raw_port = port1; |
1da177e4 | 422 | |
0a1ef3b5 | 423 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
424 | if (!dev) |
425 | return NULL; | |
426 | ||
30b1e495 | 427 | if (!usb_get_hcd(usb_hcd)) { |
1da177e4 LT |
428 | kfree(dev); |
429 | return NULL; | |
430 | } | |
c6515272 SS |
431 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
432 | if (usb_hcd->driver->alloc_dev && parent && | |
433 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
434 | usb_put_hcd(bus_to_hcd(bus)); | |
435 | kfree(dev); | |
436 | return NULL; | |
437 | } | |
1da177e4 LT |
438 | |
439 | device_initialize(&dev->dev); | |
440 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 441 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 442 | dev->dev.groups = usb_device_groups; |
1da177e4 | 443 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 444 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 445 | dev->state = USB_STATE_ATTACHED; |
9cf65991 | 446 | dev->lpm_disable_count = 1; |
4d59d8a1 | 447 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
448 | |
449 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
450 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
451 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
452 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 453 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 454 | dev->can_submit = 1; |
1da177e4 LT |
455 | |
456 | /* Save readable and stable topology id, distinguishing devices | |
457 | * by location for diagnostics, tools, driver model, etc. The | |
458 | * string is a path along hub ports, from the root. Each device's | |
459 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 460 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
461 | * as stable: bus->busnum changes easily from modprobe order, |
462 | * cardbus or pci hotplugging, and so on. | |
463 | */ | |
9251644a ON |
464 | if (unlikely(!parent)) { |
465 | dev->devpath[0] = '0'; | |
7206b001 | 466 | dev->route = 0; |
1da177e4 LT |
467 | |
468 | dev->dev.parent = bus->controller; | |
69bec725 | 469 | dev->dev.of_node = bus->controller->of_node; |
0031a06e | 470 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 471 | root_hub = 1; |
1da177e4 LT |
472 | } else { |
473 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 474 | if (parent->devpath[0] == '0') { |
9251644a | 475 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 476 | "%d", port1); |
7206b001 SS |
477 | /* Root ports are not counted in route string */ |
478 | dev->route = 0; | |
479 | } else { | |
9251644a | 480 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 481 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
482 | /* Route string assumes hubs have less than 16 ports */ |
483 | if (port1 < 15) | |
484 | dev->route = parent->route + | |
485 | (port1 << ((parent->level - 1)*4)); | |
486 | else | |
487 | dev->route = parent->route + | |
488 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 489 | } |
1da177e4 LT |
490 | |
491 | dev->dev.parent = &parent->dev; | |
0031a06e | 492 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 | 493 | |
69bec725 PC |
494 | if (!parent->parent) { |
495 | /* device under root hub's port */ | |
7222c832 | 496 | raw_port = usb_hcd_find_raw_port_number(usb_hcd, |
69bec725 PC |
497 | port1); |
498 | } | |
499 | dev->dev.of_node = usb_of_get_child_node(parent->dev.of_node, | |
7222c832 | 500 | raw_port); |
69bec725 | 501 | |
1da177e4 LT |
502 | /* hub driver sets up TT records */ |
503 | } | |
504 | ||
12c3da34 | 505 | dev->portnum = port1; |
1da177e4 LT |
506 | dev->bus = bus; |
507 | dev->parent = parent; | |
508 | INIT_LIST_HEAD(&dev->filelist); | |
509 | ||
645daaab | 510 | #ifdef CONFIG_PM |
fcc4a01e AS |
511 | pm_runtime_set_autosuspend_delay(&dev->dev, |
512 | usb_autosuspend_delay * 1000); | |
15123006 SS |
513 | dev->connect_time = jiffies; |
514 | dev->active_duration = -jiffies; | |
645daaab | 515 | #endif |
d7d07255 IPG |
516 | if (root_hub) /* Root hub always ok [and always wired] */ |
517 | dev->authorized = 1; | |
518 | else { | |
ff8e2c56 | 519 | dev->authorized = !!HCD_DEV_AUTHORIZED(usb_hcd); |
469271f8 | 520 | dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0; |
d7d07255 | 521 | } |
1da177e4 LT |
522 | return dev; |
523 | } | |
caa67a5e | 524 | EXPORT_SYMBOL_GPL(usb_alloc_dev); |
1da177e4 LT |
525 | |
526 | /** | |
527 | * usb_get_dev - increments the reference count of the usb device structure | |
528 | * @dev: the device being referenced | |
529 | * | |
530 | * Each live reference to a device should be refcounted. | |
531 | * | |
532 | * Drivers for USB interfaces should normally record such references in | |
533 | * their probe() methods, when they bind to an interface, and release | |
534 | * them by calling usb_put_dev(), in their disconnect() methods. | |
535 | * | |
626f090c | 536 | * Return: A pointer to the device with the incremented reference counter. |
1da177e4 LT |
537 | */ |
538 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
539 | { | |
540 | if (dev) | |
541 | get_device(&dev->dev); | |
542 | return dev; | |
543 | } | |
782e70c6 | 544 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
545 | |
546 | /** | |
547 | * usb_put_dev - release a use of the usb device structure | |
548 | * @dev: device that's been disconnected | |
549 | * | |
550 | * Must be called when a user of a device is finished with it. When the last | |
551 | * user of the device calls this function, the memory of the device is freed. | |
552 | */ | |
553 | void usb_put_dev(struct usb_device *dev) | |
554 | { | |
555 | if (dev) | |
556 | put_device(&dev->dev); | |
557 | } | |
782e70c6 | 558 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
559 | |
560 | /** | |
561 | * usb_get_intf - increments the reference count of the usb interface structure | |
562 | * @intf: the interface being referenced | |
563 | * | |
564 | * Each live reference to a interface must be refcounted. | |
565 | * | |
566 | * Drivers for USB interfaces should normally record such references in | |
567 | * their probe() methods, when they bind to an interface, and release | |
568 | * them by calling usb_put_intf(), in their disconnect() methods. | |
569 | * | |
626f090c | 570 | * Return: A pointer to the interface with the incremented reference counter. |
1da177e4 LT |
571 | */ |
572 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
573 | { | |
574 | if (intf) | |
575 | get_device(&intf->dev); | |
576 | return intf; | |
577 | } | |
782e70c6 | 578 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
579 | |
580 | /** | |
581 | * usb_put_intf - release a use of the usb interface structure | |
582 | * @intf: interface that's been decremented | |
583 | * | |
584 | * Must be called when a user of an interface is finished with it. When the | |
585 | * last user of the interface calls this function, the memory of the interface | |
586 | * is freed. | |
587 | */ | |
588 | void usb_put_intf(struct usb_interface *intf) | |
589 | { | |
590 | if (intf) | |
591 | put_device(&intf->dev); | |
592 | } | |
782e70c6 | 593 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
594 | |
595 | /* USB device locking | |
596 | * | |
9ad3d6cc AS |
597 | * USB devices and interfaces are locked using the semaphore in their |
598 | * embedded struct device. The hub driver guarantees that whenever a | |
599 | * device is connected or disconnected, drivers are called with the | |
600 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
601 | * |
602 | * Complications arise when several devices are to be locked at the same | |
603 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
604 | * do this; nobody else needs to worry about it. The rule for locking |
605 | * is simple: | |
1da177e4 LT |
606 | * |
607 | * When locking both a device and its parent, always lock the | |
608 | * the parent first. | |
609 | */ | |
610 | ||
1da177e4 | 611 | /** |
d0bcabcd | 612 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
613 | * @udev: device that's being locked |
614 | * @iface: interface bound to the driver making the request (optional) | |
615 | * | |
616 | * Attempts to acquire the device lock, but fails if the device is | |
617 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
618 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
619 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
620 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 621 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 622 | * |
626f090c | 623 | * Return: A negative error code for failure, otherwise 0. |
1da177e4 LT |
624 | */ |
625 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 626 | const struct usb_interface *iface) |
1da177e4 | 627 | { |
3ea15966 AS |
628 | unsigned long jiffies_expire = jiffies + HZ; |
629 | ||
1da177e4 LT |
630 | if (udev->state == USB_STATE_NOTATTACHED) |
631 | return -ENODEV; | |
632 | if (udev->state == USB_STATE_SUSPENDED) | |
633 | return -EHOSTUNREACH; | |
011b15df AS |
634 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
635 | iface->condition == USB_INTERFACE_UNBOUND)) | |
636 | return -EINTR; | |
1da177e4 | 637 | |
3142788b | 638 | while (!usb_trylock_device(udev)) { |
3ea15966 AS |
639 | |
640 | /* If we can't acquire the lock after waiting one second, | |
641 | * we're probably deadlocked */ | |
642 | if (time_after(jiffies, jiffies_expire)) | |
643 | return -EBUSY; | |
644 | ||
1da177e4 LT |
645 | msleep(15); |
646 | if (udev->state == USB_STATE_NOTATTACHED) | |
647 | return -ENODEV; | |
648 | if (udev->state == USB_STATE_SUSPENDED) | |
649 | return -EHOSTUNREACH; | |
011b15df AS |
650 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
651 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
652 | return -EINTR; |
653 | } | |
011b15df | 654 | return 0; |
1da177e4 | 655 | } |
782e70c6 | 656 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 | 657 | |
1da177e4 LT |
658 | /** |
659 | * usb_get_current_frame_number - return current bus frame number | |
660 | * @dev: the device whose bus is being queried | |
661 | * | |
626f090c YB |
662 | * Return: The current frame number for the USB host controller used |
663 | * with the given USB device. This can be used when scheduling | |
1da177e4 LT |
664 | * isochronous requests. |
665 | * | |
626f090c YB |
666 | * Note: Different kinds of host controller have different "scheduling |
667 | * horizons". While one type might support scheduling only 32 frames | |
668 | * into the future, others could support scheduling up to 1024 frames | |
669 | * into the future. | |
670 | * | |
1da177e4 LT |
671 | */ |
672 | int usb_get_current_frame_number(struct usb_device *dev) | |
673 | { | |
9251644a | 674 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 675 | } |
782e70c6 | 676 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
677 | |
678 | /*-------------------------------------------------------------------*/ | |
679 | /* | |
680 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
681 | * extra field of the interface and endpoint descriptor structs. | |
682 | */ | |
683 | ||
684 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 685 | unsigned char type, void **ptr) |
1da177e4 LT |
686 | { |
687 | struct usb_descriptor_header *header; | |
688 | ||
689 | while (size >= sizeof(struct usb_descriptor_header)) { | |
690 | header = (struct usb_descriptor_header *)buffer; | |
691 | ||
692 | if (header->bLength < 2) { | |
693 | printk(KERN_ERR | |
694 | "%s: bogus descriptor, type %d length %d\n", | |
695 | usbcore_name, | |
2c044a48 | 696 | header->bDescriptorType, |
1da177e4 LT |
697 | header->bLength); |
698 | return -1; | |
699 | } | |
700 | ||
701 | if (header->bDescriptorType == type) { | |
702 | *ptr = header; | |
703 | return 0; | |
704 | } | |
705 | ||
706 | buffer += header->bLength; | |
707 | size -= header->bLength; | |
708 | } | |
709 | return -1; | |
710 | } | |
782e70c6 | 711 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
712 | |
713 | /** | |
073900a2 | 714 | * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
1da177e4 LT |
715 | * @dev: device the buffer will be used with |
716 | * @size: requested buffer size | |
717 | * @mem_flags: affect whether allocation may block | |
718 | * @dma: used to return DMA address of buffer | |
719 | * | |
626f090c YB |
720 | * Return: Either null (indicating no buffer could be allocated), or the |
721 | * cpu-space pointer to a buffer that may be used to perform DMA to the | |
1da177e4 LT |
722 | * specified device. Such cpu-space buffers are returned along with the DMA |
723 | * address (through the pointer provided). | |
724 | * | |
626f090c | 725 | * Note: |
1da177e4 | 726 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
fbf54dd3 DB |
727 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
728 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 729 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
730 | * Using these buffers also eliminates cacheline sharing problems on |
731 | * architectures where CPU caches are not DMA-coherent. On systems without | |
732 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 | 733 | * |
073900a2 | 734 | * When the buffer is no longer used, free it with usb_free_coherent(). |
1da177e4 | 735 | */ |
073900a2 DM |
736 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags, |
737 | dma_addr_t *dma) | |
1da177e4 | 738 | { |
a6d2bb9f | 739 | if (!dev || !dev->bus) |
1da177e4 | 740 | return NULL; |
9251644a | 741 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 742 | } |
073900a2 | 743 | EXPORT_SYMBOL_GPL(usb_alloc_coherent); |
1da177e4 LT |
744 | |
745 | /** | |
073900a2 | 746 | * usb_free_coherent - free memory allocated with usb_alloc_coherent() |
1da177e4 LT |
747 | * @dev: device the buffer was used with |
748 | * @size: requested buffer size | |
749 | * @addr: CPU address of buffer | |
750 | * @dma: DMA address of buffer | |
751 | * | |
752 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
073900a2 | 753 | * been allocated using usb_alloc_coherent(), and the parameters must match |
fbf54dd3 | 754 | * those provided in that allocation request. |
1da177e4 | 755 | */ |
073900a2 DM |
756 | void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, |
757 | dma_addr_t dma) | |
1da177e4 | 758 | { |
a6d2bb9f | 759 | if (!dev || !dev->bus) |
b94badbb DT |
760 | return; |
761 | if (!addr) | |
762 | return; | |
9251644a | 763 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 764 | } |
073900a2 | 765 | EXPORT_SYMBOL_GPL(usb_free_coherent); |
1da177e4 LT |
766 | |
767 | /** | |
768 | * usb_buffer_map - create DMA mapping(s) for an urb | |
769 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
770 | * | |
626f090c YB |
771 | * URB_NO_TRANSFER_DMA_MAP is added to urb->transfer_flags if the operation |
772 | * succeeds. If the device is connected to this system through a non-DMA | |
773 | * controller, this operation always succeeds. | |
1da177e4 LT |
774 | * |
775 | * This call would normally be used for an urb which is reused, perhaps | |
776 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
777 | * calls to synchronize memory and dma state. | |
778 | * | |
779 | * Reverse the effect of this call with usb_buffer_unmap(). | |
626f090c YB |
780 | * |
781 | * Return: Either %NULL (indicating no buffer could be mapped), or @urb. | |
782 | * | |
1da177e4 LT |
783 | */ |
784 | #if 0 | |
9251644a | 785 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
786 | { |
787 | struct usb_bus *bus; | |
788 | struct device *controller; | |
789 | ||
790 | if (!urb | |
791 | || !urb->dev | |
792 | || !(bus = urb->dev->bus) | |
793 | || !(controller = bus->controller)) | |
794 | return NULL; | |
795 | ||
796 | if (controller->dma_mask) { | |
9251644a | 797 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 798 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 799 | usb_pipein(urb->pipe) |
1da177e4 | 800 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
2c044a48 GKH |
801 | /* FIXME generic api broken like pci, can't report errors */ |
802 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
803 | } else |
804 | urb->transfer_dma = ~0; | |
0ede76fc | 805 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
1da177e4 LT |
806 | return urb; |
807 | } | |
782e70c6 | 808 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
809 | #endif /* 0 */ |
810 | ||
811 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
812 | * XXX please determine whether the sync is to transfer ownership of | |
813 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
814 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
815 | */ | |
816 | #if 0 | |
817 | ||
818 | /** | |
819 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
820 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
821 | */ | |
9251644a | 822 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
823 | { |
824 | struct usb_bus *bus; | |
825 | struct device *controller; | |
826 | ||
827 | if (!urb | |
828 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
829 | || !urb->dev | |
830 | || !(bus = urb->dev->bus) | |
831 | || !(controller = bus->controller)) | |
832 | return; | |
833 | ||
834 | if (controller->dma_mask) { | |
9b8e7ba6 | 835 | dma_sync_single_for_cpu(controller, |
1da177e4 | 836 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 837 | usb_pipein(urb->pipe) |
1da177e4 | 838 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 839 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 840 | dma_sync_single_for_cpu(controller, |
1da177e4 | 841 | urb->setup_dma, |
9251644a | 842 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
843 | DMA_TO_DEVICE); |
844 | } | |
845 | } | |
782e70c6 | 846 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
847 | #endif |
848 | ||
849 | /** | |
850 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
851 | * @urb: urb whose transfer_buffer will be unmapped | |
852 | * | |
853 | * Reverses the effect of usb_buffer_map(). | |
854 | */ | |
855 | #if 0 | |
9251644a | 856 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
857 | { |
858 | struct usb_bus *bus; | |
859 | struct device *controller; | |
860 | ||
861 | if (!urb | |
862 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
863 | || !urb->dev | |
864 | || !(bus = urb->dev->bus) | |
865 | || !(controller = bus->controller)) | |
866 | return; | |
867 | ||
868 | if (controller->dma_mask) { | |
9251644a | 869 | dma_unmap_single(controller, |
1da177e4 | 870 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 871 | usb_pipein(urb->pipe) |
1da177e4 | 872 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 873 | } |
0ede76fc | 874 | urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP; |
1da177e4 | 875 | } |
782e70c6 | 876 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
877 | #endif /* 0 */ |
878 | ||
ff9c895f | 879 | #if 0 |
1da177e4 LT |
880 | /** |
881 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
882 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 883 | * @is_in: mapping transfer direction |
1da177e4 LT |
884 | * @sg: the scatterlist to map |
885 | * @nents: the number of entries in the scatterlist | |
886 | * | |
626f090c YB |
887 | * Return: Either < 0 (indicating no buffers could be mapped), or the |
888 | * number of DMA mapping array entries in the scatterlist. | |
1da177e4 | 889 | * |
626f090c | 890 | * Note: |
1da177e4 LT |
891 | * The caller is responsible for placing the resulting DMA addresses from |
892 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
893 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
894 | * | |
895 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
896 | * to complete before starting the next I/O. This is particularly easy | |
897 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
898 | * mapping entry returned, stopping on the first error or when all succeed. | |
899 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
900 | * | |
901 | * This call would normally be used when translating scatterlist requests, | |
902 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
903 | * may be able to coalesce mappings for improved I/O efficiency. | |
904 | * | |
905 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
906 | */ | |
5e60a161 | 907 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 908 | struct scatterlist *sg, int nents) |
1da177e4 LT |
909 | { |
910 | struct usb_bus *bus; | |
911 | struct device *controller; | |
912 | ||
913 | if (!dev | |
1da177e4 LT |
914 | || !(bus = dev->bus) |
915 | || !(controller = bus->controller) | |
916 | || !controller->dma_mask) | |
2912282c | 917 | return -EINVAL; |
1da177e4 | 918 | |
2c044a48 | 919 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 920 | return dma_map_sg(controller, sg, nents, |
2912282c | 921 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 922 | } |
782e70c6 | 923 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
ff9c895f | 924 | #endif |
1da177e4 LT |
925 | |
926 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
927 | * XXX please determine whether the sync is to transfer ownership of | |
928 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
929 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
930 | */ | |
931 | #if 0 | |
932 | ||
933 | /** | |
934 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
935 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 936 | * @is_in: mapping transfer direction |
1da177e4 LT |
937 | * @sg: the scatterlist to synchronize |
938 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
939 | * | |
940 | * Use this when you are re-using a scatterlist's data buffers for | |
941 | * another USB request. | |
942 | */ | |
5e60a161 | 943 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 944 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
945 | { |
946 | struct usb_bus *bus; | |
947 | struct device *controller; | |
948 | ||
949 | if (!dev | |
950 | || !(bus = dev->bus) | |
951 | || !(controller = bus->controller) | |
952 | || !controller->dma_mask) | |
953 | return; | |
954 | ||
9b8e7ba6 FT |
955 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
956 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 957 | } |
782e70c6 | 958 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
959 | #endif |
960 | ||
ff9c895f | 961 | #if 0 |
1da177e4 LT |
962 | /** |
963 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
964 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 965 | * @is_in: mapping transfer direction |
1da177e4 LT |
966 | * @sg: the scatterlist to unmap |
967 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
968 | * | |
969 | * Reverses the effect of usb_buffer_map_sg(). | |
970 | */ | |
5e60a161 | 971 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 972 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
973 | { |
974 | struct usb_bus *bus; | |
975 | struct device *controller; | |
976 | ||
977 | if (!dev | |
978 | || !(bus = dev->bus) | |
979 | || !(controller = bus->controller) | |
980 | || !controller->dma_mask) | |
981 | return; | |
982 | ||
9251644a | 983 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 984 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 985 | } |
782e70c6 | 986 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
ff9c895f | 987 | #endif |
1da177e4 | 988 | |
3b23dd6f AS |
989 | /* |
990 | * Notifications of device and interface registration | |
991 | */ | |
992 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
993 | void *data) | |
994 | { | |
995 | struct device *dev = data; | |
996 | ||
997 | switch (action) { | |
998 | case BUS_NOTIFY_ADD_DEVICE: | |
999 | if (dev->type == &usb_device_type) | |
1000 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
1001 | else if (dev->type == &usb_if_device_type) | |
643de624 | 1002 | usb_create_sysfs_intf_files(to_usb_interface(dev)); |
3b23dd6f AS |
1003 | break; |
1004 | ||
1005 | case BUS_NOTIFY_DEL_DEVICE: | |
1006 | if (dev->type == &usb_device_type) | |
1007 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
1008 | else if (dev->type == &usb_if_device_type) | |
1009 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
1010 | break; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static struct notifier_block usb_bus_nb = { | |
1016 | .notifier_call = usb_bus_notify, | |
1017 | }; | |
1018 | ||
00048b8b GKH |
1019 | struct dentry *usb_debug_root; |
1020 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
1021 | ||
719a6e88 | 1022 | static struct dentry *usb_debug_devices; |
97d7b7a4 | 1023 | |
00048b8b GKH |
1024 | static int usb_debugfs_init(void) |
1025 | { | |
1026 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
1027 | if (!usb_debug_root) | |
1028 | return -ENOENT; | |
97d7b7a4 GKH |
1029 | |
1030 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
1031 | usb_debug_root, NULL, | |
1032 | &usbfs_devices_fops); | |
1033 | if (!usb_debug_devices) { | |
1034 | debugfs_remove(usb_debug_root); | |
1035 | usb_debug_root = NULL; | |
1036 | return -ENOENT; | |
1037 | } | |
1038 | ||
00048b8b GKH |
1039 | return 0; |
1040 | } | |
1041 | ||
1042 | static void usb_debugfs_cleanup(void) | |
1043 | { | |
97d7b7a4 | 1044 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1045 | debugfs_remove(usb_debug_root); |
1046 | } | |
1047 | ||
1da177e4 LT |
1048 | /* |
1049 | * Init | |
1050 | */ | |
1051 | static int __init usb_init(void) | |
1052 | { | |
1053 | int retval; | |
1da47f54 | 1054 | if (usb_disabled()) { |
9251644a | 1055 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1056 | return 0; |
1057 | } | |
5efd2ea8 | 1058 | usb_init_pool_max(); |
1da177e4 | 1059 | |
00048b8b GKH |
1060 | retval = usb_debugfs_init(); |
1061 | if (retval) | |
1062 | goto out; | |
1063 | ||
ea79c2ed | 1064 | usb_acpi_register(); |
1da177e4 | 1065 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1066 | if (retval) |
bd859281 | 1067 | goto bus_register_failed; |
3b23dd6f AS |
1068 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1069 | if (retval) | |
1070 | goto bus_notifier_failed; | |
1da177e4 LT |
1071 | retval = usb_major_init(); |
1072 | if (retval) | |
1073 | goto major_init_failed; | |
fbf82fd2 KS |
1074 | retval = usb_register(&usbfs_driver); |
1075 | if (retval) | |
1076 | goto driver_register_failed; | |
9f8b17e6 | 1077 | retval = usb_devio_init(); |
fbf82fd2 | 1078 | if (retval) |
9f8b17e6 | 1079 | goto usb_devio_init_failed; |
1da177e4 LT |
1080 | retval = usb_hub_init(); |
1081 | if (retval) | |
1082 | goto hub_init_failed; | |
8bb54ab5 | 1083 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1084 | if (!retval) |
1085 | goto out; | |
1086 | ||
1087 | usb_hub_cleanup(); | |
1088 | hub_init_failed: | |
9f8b17e6 KS |
1089 | usb_devio_cleanup(); |
1090 | usb_devio_init_failed: | |
fbf82fd2 KS |
1091 | usb_deregister(&usbfs_driver); |
1092 | driver_register_failed: | |
1093 | usb_major_cleanup(); | |
1da177e4 | 1094 | major_init_failed: |
3b23dd6f AS |
1095 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1096 | bus_notifier_failed: | |
1da177e4 | 1097 | bus_unregister(&usb_bus_type); |
bd859281 | 1098 | bus_register_failed: |
da0af6e7 | 1099 | usb_acpi_unregister(); |
9bbdf1e0 | 1100 | usb_debugfs_cleanup(); |
1da177e4 LT |
1101 | out: |
1102 | return retval; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Cleanup | |
1107 | */ | |
1108 | static void __exit usb_exit(void) | |
1109 | { | |
1110 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1da47f54 | 1111 | if (usb_disabled()) |
1da177e4 LT |
1112 | return; |
1113 | ||
8bb54ab5 | 1114 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 | 1115 | usb_major_cleanup(); |
fbf82fd2 | 1116 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1117 | usb_devio_cleanup(); |
1da177e4 | 1118 | usb_hub_cleanup(); |
3b23dd6f | 1119 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1120 | bus_unregister(&usb_bus_type); |
da0af6e7 | 1121 | usb_acpi_unregister(); |
00048b8b | 1122 | usb_debugfs_cleanup(); |
5363de75 | 1123 | idr_destroy(&usb_bus_idr); |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | subsys_initcall(usb_init); | |
1127 | module_exit(usb_exit); | |
1da177e4 | 1128 | MODULE_LICENSE("GPL"); |