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> |
4186ecf8 | 35 | #include <linux/mutex.h> |
bd859281 | 36 | #include <linux/workqueue.h> |
00048b8b | 37 | #include <linux/debugfs.h> |
1da177e4 LT |
38 | |
39 | #include <asm/io.h> | |
87ae9afd | 40 | #include <linux/scatterlist.h> |
1da177e4 LT |
41 | #include <linux/mm.h> |
42 | #include <linux/dma-mapping.h> | |
43 | ||
44 | #include "hcd.h" | |
45 | #include "usb.h" | |
46 | ||
1da177e4 LT |
47 | |
48 | const char *usbcore_name = "usbcore"; | |
49 | ||
50 | static int nousb; /* Disable USB when built into kernel image */ | |
1da177e4 | 51 | |
b5e795f8 AS |
52 | #ifdef CONFIG_USB_SUSPEND |
53 | static int usb_autosuspend_delay = 2; /* Default delay value, | |
54 | * in seconds */ | |
eaafbc3a | 55 | module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
b5e795f8 AS |
56 | MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
57 | ||
58 | #else | |
59 | #define usb_autosuspend_delay 0 | |
60 | #endif | |
61 | ||
1da177e4 | 62 | |
91017f9c SS |
63 | /** |
64 | * usb_find_alt_setting() - Given a configuration, find the alternate setting | |
65 | * for the given interface. | |
70445ae6 RD |
66 | * @config: the configuration to search (not necessarily the current config). |
67 | * @iface_num: interface number to search in | |
68 | * @alt_num: alternate interface setting number to search for. | |
91017f9c SS |
69 | * |
70 | * Search the configuration's interface cache for the given alt setting. | |
71 | */ | |
72 | struct usb_host_interface *usb_find_alt_setting( | |
73 | struct usb_host_config *config, | |
74 | unsigned int iface_num, | |
75 | unsigned int alt_num) | |
76 | { | |
77 | struct usb_interface_cache *intf_cache = NULL; | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
81 | if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber | |
82 | == iface_num) { | |
83 | intf_cache = config->intf_cache[i]; | |
84 | break; | |
85 | } | |
86 | } | |
87 | if (!intf_cache) | |
88 | return NULL; | |
89 | for (i = 0; i < intf_cache->num_altsetting; i++) | |
90 | if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) | |
91 | return &intf_cache->altsetting[i]; | |
92 | ||
93 | printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " | |
94 | "config %u\n", alt_num, iface_num, | |
95 | config->desc.bConfigurationValue); | |
96 | return NULL; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(usb_find_alt_setting); | |
99 | ||
1da177e4 LT |
100 | /** |
101 | * usb_ifnum_to_if - get the interface object with a given interface number | |
102 | * @dev: the device whose current configuration is considered | |
103 | * @ifnum: the desired interface | |
104 | * | |
105 | * This walks the device descriptor for the currently active configuration | |
106 | * and returns a pointer to the interface with that particular interface | |
107 | * number, or null. | |
108 | * | |
109 | * Note that configuration descriptors are not required to assign interface | |
110 | * numbers sequentially, so that it would be incorrect to assume that | |
111 | * the first interface in that descriptor corresponds to interface zero. | |
112 | * This routine helps device drivers avoid such mistakes. | |
113 | * However, you should make sure that you do the right thing with any | |
114 | * alternate settings available for this interfaces. | |
115 | * | |
116 | * Don't call this function unless you are bound to one of the interfaces | |
117 | * on this device or you have locked the device! | |
118 | */ | |
095bc335 LFC |
119 | struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
120 | unsigned ifnum) | |
1da177e4 LT |
121 | { |
122 | struct usb_host_config *config = dev->actconfig; | |
123 | int i; | |
124 | ||
125 | if (!config) | |
126 | return NULL; | |
127 | for (i = 0; i < config->desc.bNumInterfaces; i++) | |
128 | if (config->interface[i]->altsetting[0] | |
129 | .desc.bInterfaceNumber == ifnum) | |
130 | return config->interface[i]; | |
131 | ||
132 | return NULL; | |
133 | } | |
782e70c6 | 134 | EXPORT_SYMBOL_GPL(usb_ifnum_to_if); |
1da177e4 LT |
135 | |
136 | /** | |
d0bcabcd | 137 | * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. |
1da177e4 LT |
138 | * @intf: the interface containing the altsetting in question |
139 | * @altnum: the desired alternate setting number | |
140 | * | |
141 | * This searches the altsetting array of the specified interface for | |
142 | * an entry with the correct bAlternateSetting value and returns a pointer | |
143 | * to that entry, or null. | |
144 | * | |
145 | * Note that altsettings need not be stored sequentially by number, so | |
146 | * it would be incorrect to assume that the first altsetting entry in | |
147 | * the array corresponds to altsetting zero. This routine helps device | |
148 | * drivers avoid such mistakes. | |
149 | * | |
150 | * Don't call this function unless you are bound to the intf interface | |
151 | * or you have locked the device! | |
152 | */ | |
2c044a48 GKH |
153 | struct usb_host_interface *usb_altnum_to_altsetting( |
154 | const struct usb_interface *intf, | |
155 | unsigned int altnum) | |
1da177e4 LT |
156 | { |
157 | int i; | |
158 | ||
159 | for (i = 0; i < intf->num_altsetting; i++) { | |
160 | if (intf->altsetting[i].desc.bAlternateSetting == altnum) | |
161 | return &intf->altsetting[i]; | |
162 | } | |
163 | return NULL; | |
164 | } | |
782e70c6 | 165 | EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); |
1da177e4 | 166 | |
ab7cd8c7 GKH |
167 | struct find_interface_arg { |
168 | int minor; | |
c2d284ee | 169 | struct device_driver *drv; |
ab7cd8c7 GKH |
170 | }; |
171 | ||
2c044a48 | 172 | static int __find_interface(struct device *dev, void *data) |
6034a080 | 173 | { |
ab7cd8c7 | 174 | struct find_interface_arg *arg = data; |
f5691d70 | 175 | struct usb_interface *intf; |
6034a080 | 176 | |
55129666 | 177 | if (!is_usb_interface(dev)) |
6034a080 | 178 | return 0; |
179 | ||
c2d284ee RD |
180 | if (dev->driver != arg->drv) |
181 | return 0; | |
6034a080 | 182 | intf = to_usb_interface(dev); |
c2d284ee | 183 | return intf->minor == arg->minor; |
6034a080 | 184 | } |
185 | ||
1da177e4 LT |
186 | /** |
187 | * usb_find_interface - find usb_interface pointer for driver and device | |
188 | * @drv: the driver whose current configuration is considered | |
189 | * @minor: the minor number of the desired device | |
190 | * | |
a2582bd4 | 191 | * This walks the bus device list and returns a pointer to the interface |
c2d284ee RD |
192 | * with the matching minor and driver. Note, this only works for devices |
193 | * that share the USB major number. | |
1da177e4 LT |
194 | */ |
195 | struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) | |
196 | { | |
ab7cd8c7 | 197 | struct find_interface_arg argb; |
a2582bd4 RD |
198 | struct device *dev; |
199 | ||
ab7cd8c7 | 200 | argb.minor = minor; |
c2d284ee RD |
201 | argb.drv = &drv->drvwrap.driver; |
202 | ||
203 | dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); | |
a2582bd4 RD |
204 | |
205 | /* Drop reference count from bus_find_device */ | |
206 | put_device(dev); | |
207 | ||
208 | return dev ? to_usb_interface(dev) : NULL; | |
1da177e4 | 209 | } |
782e70c6 | 210 | EXPORT_SYMBOL_GPL(usb_find_interface); |
1da177e4 | 211 | |
1da177e4 LT |
212 | /** |
213 | * usb_release_dev - free a usb device structure when all users of it are finished. | |
214 | * @dev: device that's been disconnected | |
215 | * | |
216 | * Will be called only by the device core when all users of this usb device are | |
217 | * done. | |
218 | */ | |
219 | static void usb_release_dev(struct device *dev) | |
220 | { | |
221 | struct usb_device *udev; | |
c6515272 | 222 | struct usb_hcd *hcd; |
1da177e4 LT |
223 | |
224 | udev = to_usb_device(dev); | |
c6515272 | 225 | hcd = bus_to_hcd(udev->bus); |
1da177e4 LT |
226 | |
227 | usb_destroy_configuration(udev); | |
c6515272 | 228 | usb_put_hcd(hcd); |
1da177e4 LT |
229 | kfree(udev->product); |
230 | kfree(udev->manufacturer); | |
231 | kfree(udev->serial); | |
232 | kfree(udev); | |
233 | } | |
234 | ||
4a9bee82 AS |
235 | #ifdef CONFIG_HOTPLUG |
236 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
237 | { | |
238 | struct usb_device *usb_dev; | |
239 | ||
240 | usb_dev = to_usb_device(dev); | |
241 | ||
242 | if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) | |
243 | return -ENOMEM; | |
244 | ||
245 | if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) | |
246 | return -ENOMEM; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | #else | |
252 | ||
253 | static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
254 | { | |
255 | return -ENODEV; | |
256 | } | |
257 | #endif /* CONFIG_HOTPLUG */ | |
258 | ||
645daaab AS |
259 | #ifdef CONFIG_PM |
260 | ||
f2189c47 AS |
261 | /* USB device Power-Management thunks. |
262 | * There's no need to distinguish here between quiescing a USB device | |
263 | * and powering it down; the generic_suspend() routine takes care of | |
264 | * it by skipping the usb_port_suspend() call for a quiesce. And for | |
265 | * USB interfaces there's no difference at all. | |
266 | */ | |
267 | ||
268 | static int usb_dev_prepare(struct device *dev) | |
269 | { | |
270 | return 0; /* Implement eventually? */ | |
271 | } | |
272 | ||
273 | static void usb_dev_complete(struct device *dev) | |
274 | { | |
275 | /* Currently used only for rebinding interfaces */ | |
9bbdf1e0 | 276 | usb_resume(dev, PMSG_ON); /* FIXME: change to PMSG_COMPLETE */ |
f2189c47 AS |
277 | } |
278 | ||
279 | static int usb_dev_suspend(struct device *dev) | |
280 | { | |
281 | return usb_suspend(dev, PMSG_SUSPEND); | |
282 | } | |
283 | ||
284 | static int usb_dev_resume(struct device *dev) | |
285 | { | |
65bfd296 | 286 | return usb_resume(dev, PMSG_RESUME); |
f2189c47 AS |
287 | } |
288 | ||
289 | static int usb_dev_freeze(struct device *dev) | |
290 | { | |
291 | return usb_suspend(dev, PMSG_FREEZE); | |
292 | } | |
293 | ||
294 | static int usb_dev_thaw(struct device *dev) | |
295 | { | |
65bfd296 | 296 | return usb_resume(dev, PMSG_THAW); |
f2189c47 AS |
297 | } |
298 | ||
299 | static int usb_dev_poweroff(struct device *dev) | |
300 | { | |
301 | return usb_suspend(dev, PMSG_HIBERNATE); | |
302 | } | |
303 | ||
304 | static int usb_dev_restore(struct device *dev) | |
305 | { | |
65bfd296 | 306 | return usb_resume(dev, PMSG_RESTORE); |
f2189c47 AS |
307 | } |
308 | ||
47145210 | 309 | static const struct dev_pm_ops usb_device_pm_ops = { |
f2189c47 AS |
310 | .prepare = usb_dev_prepare, |
311 | .complete = usb_dev_complete, | |
312 | .suspend = usb_dev_suspend, | |
313 | .resume = usb_dev_resume, | |
314 | .freeze = usb_dev_freeze, | |
315 | .thaw = usb_dev_thaw, | |
316 | .poweroff = usb_dev_poweroff, | |
317 | .restore = usb_dev_restore, | |
318 | }; | |
319 | ||
db063507 AS |
320 | #else |
321 | ||
9bbdf1e0 | 322 | #define usb_device_pm_ops (*(struct dev_pm_ops *) NULL) |
db063507 AS |
323 | |
324 | #endif /* CONFIG_PM */ | |
645daaab | 325 | |
f7a386c5 | 326 | |
e454cea2 | 327 | static char *usb_devnode(struct device *dev, mode_t *mode) |
f7a386c5 KS |
328 | { |
329 | struct usb_device *usb_dev; | |
330 | ||
331 | usb_dev = to_usb_device(dev); | |
332 | return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", | |
333 | usb_dev->bus->busnum, usb_dev->devnum); | |
334 | } | |
335 | ||
f2189c47 AS |
336 | struct device_type usb_device_type = { |
337 | .name = "usb_device", | |
338 | .release = usb_release_dev, | |
339 | .uevent = usb_dev_uevent, | |
e454cea2 | 340 | .devnode = usb_devnode, |
f2189c47 AS |
341 | .pm = &usb_device_pm_ops, |
342 | }; | |
343 | ||
d7d07255 IPG |
344 | |
345 | /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ | |
346 | static unsigned usb_bus_is_wusb(struct usb_bus *bus) | |
347 | { | |
348 | struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); | |
349 | return hcd->wireless; | |
350 | } | |
351 | ||
352 | ||
1da177e4 LT |
353 | /** |
354 | * usb_alloc_dev - usb device constructor (usbcore-internal) | |
355 | * @parent: hub to which device is connected; null to allocate a root hub | |
356 | * @bus: bus used to access the device | |
357 | * @port1: one-based index of port; ignored for root hubs | |
9251644a | 358 | * Context: !in_interrupt() |
1da177e4 LT |
359 | * |
360 | * Only hub drivers (including virtual root hub drivers for host | |
361 | * controllers) should ever call this. | |
362 | * | |
363 | * This call may not be used in a non-sleeping context. | |
364 | */ | |
2c044a48 GKH |
365 | struct usb_device *usb_alloc_dev(struct usb_device *parent, |
366 | struct usb_bus *bus, unsigned port1) | |
1da177e4 LT |
367 | { |
368 | struct usb_device *dev; | |
d7d07255 IPG |
369 | struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); |
370 | unsigned root_hub = 0; | |
1da177e4 | 371 | |
0a1ef3b5 | 372 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
373 | if (!dev) |
374 | return NULL; | |
375 | ||
17200583 | 376 | if (!usb_get_hcd(bus_to_hcd(bus))) { |
1da177e4 LT |
377 | kfree(dev); |
378 | return NULL; | |
379 | } | |
c6515272 SS |
380 | /* Root hubs aren't true devices, so don't allocate HCD resources */ |
381 | if (usb_hcd->driver->alloc_dev && parent && | |
382 | !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { | |
383 | usb_put_hcd(bus_to_hcd(bus)); | |
384 | kfree(dev); | |
385 | return NULL; | |
386 | } | |
1da177e4 LT |
387 | |
388 | device_initialize(&dev->dev); | |
389 | dev->dev.bus = &usb_bus_type; | |
9f8b17e6 | 390 | dev->dev.type = &usb_device_type; |
2e5f10e4 | 391 | dev->dev.groups = usb_device_groups; |
1da177e4 | 392 | dev->dev.dma_mask = bus->controller->dma_mask; |
70f458f6 | 393 | set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
1da177e4 | 394 | dev->state = USB_STATE_ATTACHED; |
4d59d8a1 | 395 | atomic_set(&dev->urbnum, 0); |
1da177e4 LT |
396 | |
397 | INIT_LIST_HEAD(&dev->ep0.urb_list); | |
398 | dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; | |
399 | dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; | |
400 | /* ep0 maxpacket comes later, from device descriptor */ | |
3444b26a | 401 | usb_enable_endpoint(dev, &dev->ep0, false); |
6840d255 | 402 | dev->can_submit = 1; |
1da177e4 LT |
403 | |
404 | /* Save readable and stable topology id, distinguishing devices | |
405 | * by location for diagnostics, tools, driver model, etc. The | |
406 | * string is a path along hub ports, from the root. Each device's | |
407 | * dev->devpath will be stable until USB is re-cabled, and hubs | |
7071a3ce | 408 | * are often labeled with these port numbers. The name isn't |
1da177e4 LT |
409 | * as stable: bus->busnum changes easily from modprobe order, |
410 | * cardbus or pci hotplugging, and so on. | |
411 | */ | |
9251644a ON |
412 | if (unlikely(!parent)) { |
413 | dev->devpath[0] = '0'; | |
7206b001 | 414 | dev->route = 0; |
1da177e4 LT |
415 | |
416 | dev->dev.parent = bus->controller; | |
0031a06e | 417 | dev_set_name(&dev->dev, "usb%d", bus->busnum); |
d7d07255 | 418 | root_hub = 1; |
1da177e4 LT |
419 | } else { |
420 | /* match any labeling on the hubs; it's one-based */ | |
7206b001 | 421 | if (parent->devpath[0] == '0') { |
9251644a | 422 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 423 | "%d", port1); |
7206b001 SS |
424 | /* Root ports are not counted in route string */ |
425 | dev->route = 0; | |
426 | } else { | |
9251644a | 427 | snprintf(dev->devpath, sizeof dev->devpath, |
1da177e4 | 428 | "%s.%d", parent->devpath, port1); |
4a0cd967 SS |
429 | /* Route string assumes hubs have less than 16 ports */ |
430 | if (port1 < 15) | |
431 | dev->route = parent->route + | |
432 | (port1 << ((parent->level - 1)*4)); | |
433 | else | |
434 | dev->route = parent->route + | |
435 | (15 << ((parent->level - 1)*4)); | |
7206b001 | 436 | } |
1da177e4 LT |
437 | |
438 | dev->dev.parent = &parent->dev; | |
0031a06e | 439 | dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); |
1da177e4 LT |
440 | |
441 | /* hub driver sets up TT records */ | |
442 | } | |
443 | ||
12c3da34 | 444 | dev->portnum = port1; |
1da177e4 LT |
445 | dev->bus = bus; |
446 | dev->parent = parent; | |
447 | INIT_LIST_HEAD(&dev->filelist); | |
448 | ||
645daaab | 449 | #ifdef CONFIG_PM |
b5e795f8 | 450 | dev->autosuspend_delay = usb_autosuspend_delay * HZ; |
15123006 SS |
451 | dev->connect_time = jiffies; |
452 | dev->active_duration = -jiffies; | |
645daaab | 453 | #endif |
d7d07255 IPG |
454 | if (root_hub) /* Root hub always ok [and always wired] */ |
455 | dev->authorized = 1; | |
456 | else { | |
457 | dev->authorized = usb_hcd->authorized_default; | |
458 | dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; | |
459 | } | |
1da177e4 LT |
460 | return dev; |
461 | } | |
462 | ||
463 | /** | |
464 | * usb_get_dev - increments the reference count of the usb device structure | |
465 | * @dev: the device being referenced | |
466 | * | |
467 | * Each live reference to a device should be refcounted. | |
468 | * | |
469 | * Drivers for USB interfaces should normally record such references in | |
470 | * their probe() methods, when they bind to an interface, and release | |
471 | * them by calling usb_put_dev(), in their disconnect() methods. | |
472 | * | |
473 | * A pointer to the device with the incremented reference counter is returned. | |
474 | */ | |
475 | struct usb_device *usb_get_dev(struct usb_device *dev) | |
476 | { | |
477 | if (dev) | |
478 | get_device(&dev->dev); | |
479 | return dev; | |
480 | } | |
782e70c6 | 481 | EXPORT_SYMBOL_GPL(usb_get_dev); |
1da177e4 LT |
482 | |
483 | /** | |
484 | * usb_put_dev - release a use of the usb device structure | |
485 | * @dev: device that's been disconnected | |
486 | * | |
487 | * Must be called when a user of a device is finished with it. When the last | |
488 | * user of the device calls this function, the memory of the device is freed. | |
489 | */ | |
490 | void usb_put_dev(struct usb_device *dev) | |
491 | { | |
492 | if (dev) | |
493 | put_device(&dev->dev); | |
494 | } | |
782e70c6 | 495 | EXPORT_SYMBOL_GPL(usb_put_dev); |
1da177e4 LT |
496 | |
497 | /** | |
498 | * usb_get_intf - increments the reference count of the usb interface structure | |
499 | * @intf: the interface being referenced | |
500 | * | |
501 | * Each live reference to a interface must be refcounted. | |
502 | * | |
503 | * Drivers for USB interfaces should normally record such references in | |
504 | * their probe() methods, when they bind to an interface, and release | |
505 | * them by calling usb_put_intf(), in their disconnect() methods. | |
506 | * | |
507 | * A pointer to the interface with the incremented reference counter is | |
508 | * returned. | |
509 | */ | |
510 | struct usb_interface *usb_get_intf(struct usb_interface *intf) | |
511 | { | |
512 | if (intf) | |
513 | get_device(&intf->dev); | |
514 | return intf; | |
515 | } | |
782e70c6 | 516 | EXPORT_SYMBOL_GPL(usb_get_intf); |
1da177e4 LT |
517 | |
518 | /** | |
519 | * usb_put_intf - release a use of the usb interface structure | |
520 | * @intf: interface that's been decremented | |
521 | * | |
522 | * Must be called when a user of an interface is finished with it. When the | |
523 | * last user of the interface calls this function, the memory of the interface | |
524 | * is freed. | |
525 | */ | |
526 | void usb_put_intf(struct usb_interface *intf) | |
527 | { | |
528 | if (intf) | |
529 | put_device(&intf->dev); | |
530 | } | |
782e70c6 | 531 | EXPORT_SYMBOL_GPL(usb_put_intf); |
1da177e4 LT |
532 | |
533 | /* USB device locking | |
534 | * | |
9ad3d6cc AS |
535 | * USB devices and interfaces are locked using the semaphore in their |
536 | * embedded struct device. The hub driver guarantees that whenever a | |
537 | * device is connected or disconnected, drivers are called with the | |
538 | * USB device locked as well as their particular interface. | |
1da177e4 LT |
539 | * |
540 | * Complications arise when several devices are to be locked at the same | |
541 | * time. Only hub-aware drivers that are part of usbcore ever have to | |
9ad3d6cc AS |
542 | * do this; nobody else needs to worry about it. The rule for locking |
543 | * is simple: | |
1da177e4 LT |
544 | * |
545 | * When locking both a device and its parent, always lock the | |
546 | * the parent first. | |
547 | */ | |
548 | ||
1da177e4 | 549 | /** |
d0bcabcd | 550 | * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure |
1da177e4 LT |
551 | * @udev: device that's being locked |
552 | * @iface: interface bound to the driver making the request (optional) | |
553 | * | |
554 | * Attempts to acquire the device lock, but fails if the device is | |
555 | * NOTATTACHED or SUSPENDED, or if iface is specified and the interface | |
556 | * is neither BINDING nor BOUND. Rather than sleeping to wait for the | |
557 | * lock, the routine polls repeatedly. This is to prevent deadlock with | |
558 | * disconnect; in some drivers (such as usb-storage) the disconnect() | |
3ea15966 | 559 | * or suspend() method will block waiting for a device reset to complete. |
1da177e4 | 560 | * |
011b15df | 561 | * Returns a negative error code for failure, otherwise 0. |
1da177e4 LT |
562 | */ |
563 | int usb_lock_device_for_reset(struct usb_device *udev, | |
095bc335 | 564 | const struct usb_interface *iface) |
1da177e4 | 565 | { |
3ea15966 AS |
566 | unsigned long jiffies_expire = jiffies + HZ; |
567 | ||
1da177e4 LT |
568 | if (udev->state == USB_STATE_NOTATTACHED) |
569 | return -ENODEV; | |
570 | if (udev->state == USB_STATE_SUSPENDED) | |
571 | return -EHOSTUNREACH; | |
011b15df AS |
572 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
573 | iface->condition == USB_INTERFACE_UNBOUND)) | |
574 | return -EINTR; | |
1da177e4 | 575 | |
9ad3d6cc | 576 | while (usb_trylock_device(udev) != 0) { |
3ea15966 AS |
577 | |
578 | /* If we can't acquire the lock after waiting one second, | |
579 | * we're probably deadlocked */ | |
580 | if (time_after(jiffies, jiffies_expire)) | |
581 | return -EBUSY; | |
582 | ||
1da177e4 LT |
583 | msleep(15); |
584 | if (udev->state == USB_STATE_NOTATTACHED) | |
585 | return -ENODEV; | |
586 | if (udev->state == USB_STATE_SUSPENDED) | |
587 | return -EHOSTUNREACH; | |
011b15df AS |
588 | if (iface && (iface->condition == USB_INTERFACE_UNBINDING || |
589 | iface->condition == USB_INTERFACE_UNBOUND)) | |
1da177e4 LT |
590 | return -EINTR; |
591 | } | |
011b15df | 592 | return 0; |
1da177e4 | 593 | } |
782e70c6 | 594 | EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); |
1da177e4 LT |
595 | |
596 | static struct usb_device *match_device(struct usb_device *dev, | |
597 | u16 vendor_id, u16 product_id) | |
598 | { | |
599 | struct usb_device *ret_dev = NULL; | |
600 | int child; | |
601 | ||
602 | dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", | |
603 | le16_to_cpu(dev->descriptor.idVendor), | |
604 | le16_to_cpu(dev->descriptor.idProduct)); | |
605 | ||
606 | /* see if this device matches */ | |
607 | if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && | |
608 | (product_id == le16_to_cpu(dev->descriptor.idProduct))) { | |
9251644a | 609 | dev_dbg(&dev->dev, "matched this device!\n"); |
1da177e4 LT |
610 | ret_dev = usb_get_dev(dev); |
611 | goto exit; | |
612 | } | |
613 | ||
614 | /* look through all of the children of this device */ | |
615 | for (child = 0; child < dev->maxchild; ++child) { | |
616 | if (dev->children[child]) { | |
9ad3d6cc | 617 | usb_lock_device(dev->children[child]); |
1da177e4 LT |
618 | ret_dev = match_device(dev->children[child], |
619 | vendor_id, product_id); | |
9ad3d6cc | 620 | usb_unlock_device(dev->children[child]); |
1da177e4 LT |
621 | if (ret_dev) |
622 | goto exit; | |
623 | } | |
624 | } | |
625 | exit: | |
626 | return ret_dev; | |
627 | } | |
628 | ||
629 | /** | |
630 | * usb_find_device - find a specific usb device in the system | |
631 | * @vendor_id: the vendor id of the device to find | |
632 | * @product_id: the product id of the device to find | |
633 | * | |
634 | * Returns a pointer to a struct usb_device if such a specified usb | |
635 | * device is present in the system currently. The usage count of the | |
636 | * device will be incremented if a device is found. Make sure to call | |
637 | * usb_put_dev() when the caller is finished with the device. | |
638 | * | |
639 | * If a device with the specified vendor and product id is not found, | |
640 | * NULL is returned. | |
641 | */ | |
642 | struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) | |
643 | { | |
644 | struct list_head *buslist; | |
645 | struct usb_bus *bus; | |
646 | struct usb_device *dev = NULL; | |
2c044a48 | 647 | |
4186ecf8 | 648 | mutex_lock(&usb_bus_list_lock); |
1da177e4 | 649 | for (buslist = usb_bus_list.next; |
2c044a48 | 650 | buslist != &usb_bus_list; |
1da177e4 LT |
651 | buslist = buslist->next) { |
652 | bus = container_of(buslist, struct usb_bus, bus_list); | |
653 | if (!bus->root_hub) | |
654 | continue; | |
655 | usb_lock_device(bus->root_hub); | |
656 | dev = match_device(bus->root_hub, vendor_id, product_id); | |
657 | usb_unlock_device(bus->root_hub); | |
658 | if (dev) | |
659 | goto exit; | |
660 | } | |
661 | exit: | |
4186ecf8 | 662 | mutex_unlock(&usb_bus_list_lock); |
1da177e4 LT |
663 | return dev; |
664 | } | |
665 | ||
666 | /** | |
667 | * usb_get_current_frame_number - return current bus frame number | |
668 | * @dev: the device whose bus is being queried | |
669 | * | |
670 | * Returns the current frame number for the USB host controller | |
671 | * used with the given USB device. This can be used when scheduling | |
672 | * isochronous requests. | |
673 | * | |
674 | * Note that different kinds of host controller have different | |
675 | * "scheduling horizons". While one type might support scheduling only | |
676 | * 32 frames into the future, others could support scheduling up to | |
677 | * 1024 frames into the future. | |
678 | */ | |
679 | int usb_get_current_frame_number(struct usb_device *dev) | |
680 | { | |
9251644a | 681 | return usb_hcd_get_frame_number(dev); |
1da177e4 | 682 | } |
782e70c6 | 683 | EXPORT_SYMBOL_GPL(usb_get_current_frame_number); |
1da177e4 LT |
684 | |
685 | /*-------------------------------------------------------------------*/ | |
686 | /* | |
687 | * __usb_get_extra_descriptor() finds a descriptor of specific type in the | |
688 | * extra field of the interface and endpoint descriptor structs. | |
689 | */ | |
690 | ||
691 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
2c044a48 | 692 | unsigned char type, void **ptr) |
1da177e4 LT |
693 | { |
694 | struct usb_descriptor_header *header; | |
695 | ||
696 | while (size >= sizeof(struct usb_descriptor_header)) { | |
697 | header = (struct usb_descriptor_header *)buffer; | |
698 | ||
699 | if (header->bLength < 2) { | |
700 | printk(KERN_ERR | |
701 | "%s: bogus descriptor, type %d length %d\n", | |
702 | usbcore_name, | |
2c044a48 | 703 | header->bDescriptorType, |
1da177e4 LT |
704 | header->bLength); |
705 | return -1; | |
706 | } | |
707 | ||
708 | if (header->bDescriptorType == type) { | |
709 | *ptr = header; | |
710 | return 0; | |
711 | } | |
712 | ||
713 | buffer += header->bLength; | |
714 | size -= header->bLength; | |
715 | } | |
716 | return -1; | |
717 | } | |
782e70c6 | 718 | EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor); |
1da177e4 LT |
719 | |
720 | /** | |
073900a2 | 721 | * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
1da177e4 LT |
722 | * @dev: device the buffer will be used with |
723 | * @size: requested buffer size | |
724 | * @mem_flags: affect whether allocation may block | |
725 | * @dma: used to return DMA address of buffer | |
726 | * | |
727 | * Return value is either null (indicating no buffer could be allocated), or | |
728 | * the cpu-space pointer to a buffer that may be used to perform DMA to the | |
729 | * specified device. Such cpu-space buffers are returned along with the DMA | |
730 | * address (through the pointer provided). | |
731 | * | |
732 | * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags | |
fbf54dd3 DB |
733 | * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU |
734 | * hardware during URB completion/resubmit. The implementation varies between | |
1da177e4 | 735 | * platforms, depending on details of how DMA will work to this device. |
fbf54dd3 DB |
736 | * Using these buffers also eliminates cacheline sharing problems on |
737 | * architectures where CPU caches are not DMA-coherent. On systems without | |
738 | * bus-snooping caches, these buffers are uncached. | |
1da177e4 | 739 | * |
073900a2 | 740 | * When the buffer is no longer used, free it with usb_free_coherent(). |
1da177e4 | 741 | */ |
073900a2 DM |
742 | void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags, |
743 | dma_addr_t *dma) | |
1da177e4 | 744 | { |
a6d2bb9f | 745 | if (!dev || !dev->bus) |
1da177e4 | 746 | return NULL; |
9251644a | 747 | return hcd_buffer_alloc(dev->bus, size, mem_flags, dma); |
1da177e4 | 748 | } |
073900a2 | 749 | EXPORT_SYMBOL_GPL(usb_alloc_coherent); |
1da177e4 LT |
750 | |
751 | /** | |
073900a2 | 752 | * usb_free_coherent - free memory allocated with usb_alloc_coherent() |
1da177e4 LT |
753 | * @dev: device the buffer was used with |
754 | * @size: requested buffer size | |
755 | * @addr: CPU address of buffer | |
756 | * @dma: DMA address of buffer | |
757 | * | |
758 | * This reclaims an I/O buffer, letting it be reused. The memory must have | |
073900a2 | 759 | * been allocated using usb_alloc_coherent(), and the parameters must match |
fbf54dd3 | 760 | * those provided in that allocation request. |
1da177e4 | 761 | */ |
073900a2 DM |
762 | void usb_free_coherent(struct usb_device *dev, size_t size, void *addr, |
763 | dma_addr_t dma) | |
1da177e4 | 764 | { |
a6d2bb9f | 765 | if (!dev || !dev->bus) |
b94badbb DT |
766 | return; |
767 | if (!addr) | |
768 | return; | |
9251644a | 769 | hcd_buffer_free(dev->bus, size, addr, dma); |
1da177e4 | 770 | } |
073900a2 | 771 | EXPORT_SYMBOL_GPL(usb_free_coherent); |
1da177e4 LT |
772 | |
773 | /** | |
774 | * usb_buffer_map - create DMA mapping(s) for an urb | |
775 | * @urb: urb whose transfer_buffer/setup_packet will be mapped | |
776 | * | |
777 | * Return value is either null (indicating no buffer could be mapped), or | |
778 | * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are | |
779 | * added to urb->transfer_flags if the operation succeeds. If the device | |
780 | * is connected to this system through a non-DMA controller, this operation | |
781 | * always succeeds. | |
782 | * | |
783 | * This call would normally be used for an urb which is reused, perhaps | |
784 | * as the target of a large periodic transfer, with usb_buffer_dmasync() | |
785 | * calls to synchronize memory and dma state. | |
786 | * | |
787 | * Reverse the effect of this call with usb_buffer_unmap(). | |
788 | */ | |
789 | #if 0 | |
9251644a | 790 | struct urb *usb_buffer_map(struct urb *urb) |
1da177e4 LT |
791 | { |
792 | struct usb_bus *bus; | |
793 | struct device *controller; | |
794 | ||
795 | if (!urb | |
796 | || !urb->dev | |
797 | || !(bus = urb->dev->bus) | |
798 | || !(controller = bus->controller)) | |
799 | return NULL; | |
800 | ||
801 | if (controller->dma_mask) { | |
9251644a | 802 | urb->transfer_dma = dma_map_single(controller, |
1da177e4 | 803 | urb->transfer_buffer, urb->transfer_buffer_length, |
9251644a | 804 | usb_pipein(urb->pipe) |
1da177e4 | 805 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
806 | if (usb_pipecontrol(urb->pipe)) |
807 | urb->setup_dma = dma_map_single(controller, | |
1da177e4 | 808 | urb->setup_packet, |
9251644a | 809 | sizeof(struct usb_ctrlrequest), |
1da177e4 | 810 | DMA_TO_DEVICE); |
2c044a48 GKH |
811 | /* FIXME generic api broken like pci, can't report errors */ |
812 | /* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */ | |
1da177e4 LT |
813 | } else |
814 | urb->transfer_dma = ~0; | |
815 | urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | |
816 | | URB_NO_SETUP_DMA_MAP); | |
817 | return urb; | |
818 | } | |
782e70c6 | 819 | EXPORT_SYMBOL_GPL(usb_buffer_map); |
1da177e4 LT |
820 | #endif /* 0 */ |
821 | ||
822 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
823 | * XXX please determine whether the sync is to transfer ownership of | |
824 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
825 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
826 | */ | |
827 | #if 0 | |
828 | ||
829 | /** | |
830 | * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) | |
831 | * @urb: urb whose transfer_buffer/setup_packet will be synchronized | |
832 | */ | |
9251644a | 833 | void usb_buffer_dmasync(struct urb *urb) |
1da177e4 LT |
834 | { |
835 | struct usb_bus *bus; | |
836 | struct device *controller; | |
837 | ||
838 | if (!urb | |
839 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
840 | || !urb->dev | |
841 | || !(bus = urb->dev->bus) | |
842 | || !(controller = bus->controller)) | |
843 | return; | |
844 | ||
845 | if (controller->dma_mask) { | |
9b8e7ba6 | 846 | dma_sync_single_for_cpu(controller, |
1da177e4 | 847 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 848 | usb_pipein(urb->pipe) |
1da177e4 | 849 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a | 850 | if (usb_pipecontrol(urb->pipe)) |
9b8e7ba6 | 851 | dma_sync_single_for_cpu(controller, |
1da177e4 | 852 | urb->setup_dma, |
9251644a | 853 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
854 | DMA_TO_DEVICE); |
855 | } | |
856 | } | |
782e70c6 | 857 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync); |
1da177e4 LT |
858 | #endif |
859 | ||
860 | /** | |
861 | * usb_buffer_unmap - free DMA mapping(s) for an urb | |
862 | * @urb: urb whose transfer_buffer will be unmapped | |
863 | * | |
864 | * Reverses the effect of usb_buffer_map(). | |
865 | */ | |
866 | #if 0 | |
9251644a | 867 | void usb_buffer_unmap(struct urb *urb) |
1da177e4 LT |
868 | { |
869 | struct usb_bus *bus; | |
870 | struct device *controller; | |
871 | ||
872 | if (!urb | |
873 | || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
874 | || !urb->dev | |
875 | || !(bus = urb->dev->bus) | |
876 | || !(controller = bus->controller)) | |
877 | return; | |
878 | ||
879 | if (controller->dma_mask) { | |
9251644a | 880 | dma_unmap_single(controller, |
1da177e4 | 881 | urb->transfer_dma, urb->transfer_buffer_length, |
9251644a | 882 | usb_pipein(urb->pipe) |
1da177e4 | 883 | ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
9251644a ON |
884 | if (usb_pipecontrol(urb->pipe)) |
885 | dma_unmap_single(controller, | |
1da177e4 | 886 | urb->setup_dma, |
9251644a | 887 | sizeof(struct usb_ctrlrequest), |
1da177e4 LT |
888 | DMA_TO_DEVICE); |
889 | } | |
890 | urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP | |
891 | | URB_NO_SETUP_DMA_MAP); | |
892 | } | |
782e70c6 | 893 | EXPORT_SYMBOL_GPL(usb_buffer_unmap); |
1da177e4 LT |
894 | #endif /* 0 */ |
895 | ||
896 | /** | |
897 | * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint | |
898 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 899 | * @is_in: mapping transfer direction |
1da177e4 LT |
900 | * @sg: the scatterlist to map |
901 | * @nents: the number of entries in the scatterlist | |
902 | * | |
903 | * Return value is either < 0 (indicating no buffers could be mapped), or | |
904 | * the number of DMA mapping array entries in the scatterlist. | |
905 | * | |
906 | * The caller is responsible for placing the resulting DMA addresses from | |
907 | * the scatterlist into URB transfer buffer pointers, and for setting the | |
908 | * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. | |
909 | * | |
910 | * Top I/O rates come from queuing URBs, instead of waiting for each one | |
911 | * to complete before starting the next I/O. This is particularly easy | |
912 | * to do with scatterlists. Just allocate and submit one URB for each DMA | |
913 | * mapping entry returned, stopping on the first error or when all succeed. | |
914 | * Better yet, use the usb_sg_*() calls, which do that (and more) for you. | |
915 | * | |
916 | * This call would normally be used when translating scatterlist requests, | |
917 | * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it | |
918 | * may be able to coalesce mappings for improved I/O efficiency. | |
919 | * | |
920 | * Reverse the effect of this call with usb_buffer_unmap_sg(). | |
921 | */ | |
5e60a161 | 922 | int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
095bc335 | 923 | struct scatterlist *sg, int nents) |
1da177e4 LT |
924 | { |
925 | struct usb_bus *bus; | |
926 | struct device *controller; | |
927 | ||
928 | if (!dev | |
1da177e4 LT |
929 | || !(bus = dev->bus) |
930 | || !(controller = bus->controller) | |
931 | || !controller->dma_mask) | |
2912282c | 932 | return -EINVAL; |
1da177e4 | 933 | |
2c044a48 | 934 | /* FIXME generic api broken like pci, can't report errors */ |
9251644a | 935 | return dma_map_sg(controller, sg, nents, |
2912282c | 936 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM; |
1da177e4 | 937 | } |
782e70c6 | 938 | EXPORT_SYMBOL_GPL(usb_buffer_map_sg); |
1da177e4 LT |
939 | |
940 | /* XXX DISABLED, no users currently. If you wish to re-enable this | |
941 | * XXX please determine whether the sync is to transfer ownership of | |
942 | * XXX the buffer from device to cpu or vice verse, and thusly use the | |
943 | * XXX appropriate _for_{cpu,device}() method. -DaveM | |
944 | */ | |
945 | #if 0 | |
946 | ||
947 | /** | |
948 | * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) | |
949 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 950 | * @is_in: mapping transfer direction |
1da177e4 LT |
951 | * @sg: the scatterlist to synchronize |
952 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
953 | * | |
954 | * Use this when you are re-using a scatterlist's data buffers for | |
955 | * another USB request. | |
956 | */ | |
5e60a161 | 957 | void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
095bc335 | 958 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
959 | { |
960 | struct usb_bus *bus; | |
961 | struct device *controller; | |
962 | ||
963 | if (!dev | |
964 | || !(bus = dev->bus) | |
965 | || !(controller = bus->controller) | |
966 | || !controller->dma_mask) | |
967 | return; | |
968 | ||
9b8e7ba6 FT |
969 | dma_sync_sg_for_cpu(controller, sg, n_hw_ents, |
970 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1da177e4 | 971 | } |
782e70c6 | 972 | EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); |
1da177e4 LT |
973 | #endif |
974 | ||
975 | /** | |
976 | * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist | |
977 | * @dev: device to which the scatterlist will be mapped | |
5e60a161 | 978 | * @is_in: mapping transfer direction |
1da177e4 LT |
979 | * @sg: the scatterlist to unmap |
980 | * @n_hw_ents: the positive return value from usb_buffer_map_sg | |
981 | * | |
982 | * Reverses the effect of usb_buffer_map_sg(). | |
983 | */ | |
5e60a161 | 984 | void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
095bc335 | 985 | struct scatterlist *sg, int n_hw_ents) |
1da177e4 LT |
986 | { |
987 | struct usb_bus *bus; | |
988 | struct device *controller; | |
989 | ||
990 | if (!dev | |
991 | || !(bus = dev->bus) | |
992 | || !(controller = bus->controller) | |
993 | || !controller->dma_mask) | |
994 | return; | |
995 | ||
9251644a | 996 | dma_unmap_sg(controller, sg, n_hw_ents, |
5e60a161 | 997 | is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
1da177e4 | 998 | } |
782e70c6 | 999 | EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg); |
1da177e4 | 1000 | |
785895ff RR |
1001 | /* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */ |
1002 | #ifdef MODULE | |
1003 | module_param(nousb, bool, 0444); | |
1004 | #else | |
1005 | core_param(nousb, nousb, bool, 0444); | |
1006 | #endif | |
1da177e4 LT |
1007 | |
1008 | /* | |
1009 | * for external read access to <nousb> | |
1010 | */ | |
1011 | int usb_disabled(void) | |
1012 | { | |
1013 | return nousb; | |
1014 | } | |
782e70c6 | 1015 | EXPORT_SYMBOL_GPL(usb_disabled); |
1da177e4 | 1016 | |
3b23dd6f AS |
1017 | /* |
1018 | * Notifications of device and interface registration | |
1019 | */ | |
1020 | static int usb_bus_notify(struct notifier_block *nb, unsigned long action, | |
1021 | void *data) | |
1022 | { | |
1023 | struct device *dev = data; | |
1024 | ||
1025 | switch (action) { | |
1026 | case BUS_NOTIFY_ADD_DEVICE: | |
1027 | if (dev->type == &usb_device_type) | |
1028 | (void) usb_create_sysfs_dev_files(to_usb_device(dev)); | |
1029 | else if (dev->type == &usb_if_device_type) | |
1030 | (void) usb_create_sysfs_intf_files( | |
1031 | to_usb_interface(dev)); | |
1032 | break; | |
1033 | ||
1034 | case BUS_NOTIFY_DEL_DEVICE: | |
1035 | if (dev->type == &usb_device_type) | |
1036 | usb_remove_sysfs_dev_files(to_usb_device(dev)); | |
1037 | else if (dev->type == &usb_if_device_type) | |
1038 | usb_remove_sysfs_intf_files(to_usb_interface(dev)); | |
1039 | break; | |
1040 | } | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static struct notifier_block usb_bus_nb = { | |
1045 | .notifier_call = usb_bus_notify, | |
1046 | }; | |
1047 | ||
00048b8b GKH |
1048 | struct dentry *usb_debug_root; |
1049 | EXPORT_SYMBOL_GPL(usb_debug_root); | |
1050 | ||
719a6e88 | 1051 | static struct dentry *usb_debug_devices; |
97d7b7a4 | 1052 | |
00048b8b GKH |
1053 | static int usb_debugfs_init(void) |
1054 | { | |
1055 | usb_debug_root = debugfs_create_dir("usb", NULL); | |
1056 | if (!usb_debug_root) | |
1057 | return -ENOENT; | |
97d7b7a4 GKH |
1058 | |
1059 | usb_debug_devices = debugfs_create_file("devices", 0444, | |
1060 | usb_debug_root, NULL, | |
1061 | &usbfs_devices_fops); | |
1062 | if (!usb_debug_devices) { | |
1063 | debugfs_remove(usb_debug_root); | |
1064 | usb_debug_root = NULL; | |
1065 | return -ENOENT; | |
1066 | } | |
1067 | ||
00048b8b GKH |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | static void usb_debugfs_cleanup(void) | |
1072 | { | |
97d7b7a4 | 1073 | debugfs_remove(usb_debug_devices); |
00048b8b GKH |
1074 | debugfs_remove(usb_debug_root); |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | /* |
1078 | * Init | |
1079 | */ | |
1080 | static int __init usb_init(void) | |
1081 | { | |
1082 | int retval; | |
1083 | if (nousb) { | |
9251644a | 1084 | pr_info("%s: USB support disabled\n", usbcore_name); |
1da177e4 LT |
1085 | return 0; |
1086 | } | |
1087 | ||
00048b8b GKH |
1088 | retval = usb_debugfs_init(); |
1089 | if (retval) | |
1090 | goto out; | |
1091 | ||
1da177e4 | 1092 | retval = bus_register(&usb_bus_type); |
2c044a48 | 1093 | if (retval) |
bd859281 | 1094 | goto bus_register_failed; |
3b23dd6f AS |
1095 | retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); |
1096 | if (retval) | |
1097 | goto bus_notifier_failed; | |
1da177e4 LT |
1098 | retval = usb_major_init(); |
1099 | if (retval) | |
1100 | goto major_init_failed; | |
fbf82fd2 KS |
1101 | retval = usb_register(&usbfs_driver); |
1102 | if (retval) | |
1103 | goto driver_register_failed; | |
9f8b17e6 | 1104 | retval = usb_devio_init(); |
fbf82fd2 | 1105 | if (retval) |
9f8b17e6 | 1106 | goto usb_devio_init_failed; |
1da177e4 LT |
1107 | retval = usbfs_init(); |
1108 | if (retval) | |
1109 | goto fs_init_failed; | |
1110 | retval = usb_hub_init(); | |
1111 | if (retval) | |
1112 | goto hub_init_failed; | |
8bb54ab5 | 1113 | retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
1da177e4 LT |
1114 | if (!retval) |
1115 | goto out; | |
1116 | ||
1117 | usb_hub_cleanup(); | |
1118 | hub_init_failed: | |
1119 | usbfs_cleanup(); | |
1120 | fs_init_failed: | |
9f8b17e6 KS |
1121 | usb_devio_cleanup(); |
1122 | usb_devio_init_failed: | |
fbf82fd2 KS |
1123 | usb_deregister(&usbfs_driver); |
1124 | driver_register_failed: | |
1125 | usb_major_cleanup(); | |
1da177e4 | 1126 | major_init_failed: |
3b23dd6f AS |
1127 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1128 | bus_notifier_failed: | |
1da177e4 | 1129 | bus_unregister(&usb_bus_type); |
bd859281 | 1130 | bus_register_failed: |
9bbdf1e0 | 1131 | usb_debugfs_cleanup(); |
1da177e4 LT |
1132 | out: |
1133 | return retval; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Cleanup | |
1138 | */ | |
1139 | static void __exit usb_exit(void) | |
1140 | { | |
1141 | /* This will matter if shutdown/reboot does exitcalls. */ | |
1142 | if (nousb) | |
1143 | return; | |
1144 | ||
8bb54ab5 | 1145 | usb_deregister_device_driver(&usb_generic_driver); |
1da177e4 LT |
1146 | usb_major_cleanup(); |
1147 | usbfs_cleanup(); | |
fbf82fd2 | 1148 | usb_deregister(&usbfs_driver); |
9f8b17e6 | 1149 | usb_devio_cleanup(); |
1da177e4 | 1150 | usb_hub_cleanup(); |
3b23dd6f | 1151 | bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); |
1da177e4 | 1152 | bus_unregister(&usb_bus_type); |
00048b8b | 1153 | usb_debugfs_cleanup(); |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | subsys_initcall(usb_init); | |
1157 | module_exit(usb_exit); | |
1da177e4 | 1158 | MODULE_LICENSE("GPL"); |