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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
2ccea03a FB |
2 | /** |
3 | * udc.c - Core UDC Framework | |
4 | * | |
5 | * Copyright (C) 2010 Texas Instruments | |
6 | * Author: Felipe Balbi <balbi@ti.com> | |
2ccea03a FB |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/list.h> | |
13 | #include <linux/err.h> | |
a698908d | 14 | #include <linux/dma-mapping.h> |
614536da | 15 | #include <linux/sched/task_stack.h> |
5702f753 | 16 | #include <linux/workqueue.h> |
2ccea03a FB |
17 | |
18 | #include <linux/usb/ch9.h> | |
19 | #include <linux/usb/gadget.h> | |
0cfbd328 | 20 | #include <linux/usb.h> |
2ccea03a | 21 | |
5e42d710 FB |
22 | #include "trace.h" |
23 | ||
2ccea03a FB |
24 | /** |
25 | * struct usb_udc - describes one usb device controller | |
26 | * @driver - the gadget driver pointer. For use by the class code | |
27 | * @dev - the child device to the actual controller | |
28 | * @gadget - the gadget. For use by the class code | |
29 | * @list - for use by the udc class driver | |
628ef0d2 PC |
30 | * @vbus - for udcs who care about vbus status, this value is real vbus status; |
31 | * for udcs who do not care about vbus status, this value is always true | |
2ccea03a FB |
32 | * |
33 | * This represents the internal data structure which is used by the UDC-class | |
34 | * to hold information about udc driver and gadget together. | |
35 | */ | |
36 | struct usb_udc { | |
37 | struct usb_gadget_driver *driver; | |
38 | struct usb_gadget *gadget; | |
39 | struct device dev; | |
40 | struct list_head list; | |
628ef0d2 | 41 | bool vbus; |
2ccea03a FB |
42 | }; |
43 | ||
44 | static struct class *udc_class; | |
2ccea03a | 45 | static LIST_HEAD(udc_list); |
855ed04a | 46 | static LIST_HEAD(gadget_driver_pending_list); |
2ccea03a FB |
47 | static DEFINE_MUTEX(udc_lock); |
48 | ||
855ed04a RB |
49 | static int udc_bind_to_driver(struct usb_udc *udc, |
50 | struct usb_gadget_driver *driver); | |
51 | ||
2ccea03a FB |
52 | /* ------------------------------------------------------------------------- */ |
53 | ||
5a8d651a FB |
54 | /** |
55 | * usb_ep_set_maxpacket_limit - set maximum packet size limit for endpoint | |
56 | * @ep:the endpoint being configured | |
57 | * @maxpacket_limit:value of maximum packet size limit | |
58 | * | |
59 | * This function should be used only in UDC drivers to initialize endpoint | |
60 | * (usually in probe function). | |
61 | */ | |
62 | void usb_ep_set_maxpacket_limit(struct usb_ep *ep, | |
63 | unsigned maxpacket_limit) | |
64 | { | |
65 | ep->maxpacket_limit = maxpacket_limit; | |
66 | ep->maxpacket = maxpacket_limit; | |
5e42d710 FB |
67 | |
68 | trace_usb_ep_set_maxpacket_limit(ep, 0); | |
5a8d651a FB |
69 | } |
70 | EXPORT_SYMBOL_GPL(usb_ep_set_maxpacket_limit); | |
71 | ||
72 | /** | |
73 | * usb_ep_enable - configure endpoint, making it usable | |
74 | * @ep:the endpoint being configured. may not be the endpoint named "ep0". | |
75 | * drivers discover endpoints through the ep_list of a usb_gadget. | |
76 | * | |
77 | * When configurations are set, or when interface settings change, the driver | |
78 | * will enable or disable the relevant endpoints. while it is enabled, an | |
79 | * endpoint may be used for i/o until the driver receives a disconnect() from | |
80 | * the host or until the endpoint is disabled. | |
81 | * | |
82 | * the ep0 implementation (which calls this routine) must ensure that the | |
83 | * hardware capabilities of each endpoint match the descriptor provided | |
84 | * for it. for example, an endpoint named "ep2in-bulk" would be usable | |
85 | * for interrupt transfers as well as bulk, but it likely couldn't be used | |
86 | * for iso transfers or for endpoint 14. some endpoints are fully | |
87 | * configurable, with more generic names like "ep-a". (remember that for | |
88 | * USB, "in" means "towards the USB master".) | |
89 | * | |
90 | * returns zero, or a negative error code. | |
91 | */ | |
92 | int usb_ep_enable(struct usb_ep *ep) | |
93 | { | |
5e42d710 | 94 | int ret = 0; |
5a8d651a FB |
95 | |
96 | if (ep->enabled) | |
5e42d710 | 97 | goto out; |
5a8d651a FB |
98 | |
99 | ret = ep->ops->enable(ep, ep->desc); | |
f510b5a1 | 100 | if (ret) |
5e42d710 | 101 | goto out; |
5a8d651a FB |
102 | |
103 | ep->enabled = true; | |
104 | ||
5e42d710 FB |
105 | out: |
106 | trace_usb_ep_enable(ep, ret); | |
107 | ||
108 | return ret; | |
5a8d651a FB |
109 | } |
110 | EXPORT_SYMBOL_GPL(usb_ep_enable); | |
111 | ||
112 | /** | |
113 | * usb_ep_disable - endpoint is no longer usable | |
114 | * @ep:the endpoint being unconfigured. may not be the endpoint named "ep0". | |
115 | * | |
116 | * no other task may be using this endpoint when this is called. | |
117 | * any pending and uncompleted requests will complete with status | |
118 | * indicating disconnect (-ESHUTDOWN) before this call returns. | |
119 | * gadget drivers must call usb_ep_enable() again before queueing | |
120 | * requests to the endpoint. | |
121 | * | |
122 | * returns zero, or a negative error code. | |
123 | */ | |
124 | int usb_ep_disable(struct usb_ep *ep) | |
125 | { | |
5e42d710 | 126 | int ret = 0; |
5a8d651a FB |
127 | |
128 | if (!ep->enabled) | |
5e42d710 | 129 | goto out; |
5a8d651a FB |
130 | |
131 | ret = ep->ops->disable(ep); | |
8a8b161d | 132 | if (ret) |
5e42d710 | 133 | goto out; |
5a8d651a FB |
134 | |
135 | ep->enabled = false; | |
136 | ||
5e42d710 FB |
137 | out: |
138 | trace_usb_ep_disable(ep, ret); | |
139 | ||
140 | return ret; | |
5a8d651a FB |
141 | } |
142 | EXPORT_SYMBOL_GPL(usb_ep_disable); | |
143 | ||
144 | /** | |
145 | * usb_ep_alloc_request - allocate a request object to use with this endpoint | |
146 | * @ep:the endpoint to be used with with the request | |
147 | * @gfp_flags:GFP_* flags to use | |
148 | * | |
149 | * Request objects must be allocated with this call, since they normally | |
150 | * need controller-specific setup and may even need endpoint-specific | |
151 | * resources such as allocation of DMA descriptors. | |
152 | * Requests may be submitted with usb_ep_queue(), and receive a single | |
153 | * completion callback. Free requests with usb_ep_free_request(), when | |
154 | * they are no longer needed. | |
155 | * | |
156 | * Returns the request, or null if one could not be allocated. | |
157 | */ | |
158 | struct usb_request *usb_ep_alloc_request(struct usb_ep *ep, | |
159 | gfp_t gfp_flags) | |
160 | { | |
5e42d710 FB |
161 | struct usb_request *req = NULL; |
162 | ||
163 | req = ep->ops->alloc_request(ep, gfp_flags); | |
164 | ||
165 | trace_usb_ep_alloc_request(ep, req, req ? 0 : -ENOMEM); | |
166 | ||
167 | return req; | |
5a8d651a FB |
168 | } |
169 | EXPORT_SYMBOL_GPL(usb_ep_alloc_request); | |
170 | ||
171 | /** | |
172 | * usb_ep_free_request - frees a request object | |
173 | * @ep:the endpoint associated with the request | |
174 | * @req:the request being freed | |
175 | * | |
176 | * Reverses the effect of usb_ep_alloc_request(). | |
177 | * Caller guarantees the request is not queued, and that it will | |
178 | * no longer be requeued (or otherwise used). | |
179 | */ | |
180 | void usb_ep_free_request(struct usb_ep *ep, | |
181 | struct usb_request *req) | |
182 | { | |
5e42d710 | 183 | trace_usb_ep_free_request(ep, req, 0); |
fdc69327 | 184 | ep->ops->free_request(ep, req); |
5a8d651a FB |
185 | } |
186 | EXPORT_SYMBOL_GPL(usb_ep_free_request); | |
187 | ||
188 | /** | |
189 | * usb_ep_queue - queues (submits) an I/O request to an endpoint. | |
190 | * @ep:the endpoint associated with the request | |
191 | * @req:the request being submitted | |
192 | * @gfp_flags: GFP_* flags to use in case the lower level driver couldn't | |
193 | * pre-allocate all necessary memory with the request. | |
194 | * | |
195 | * This tells the device controller to perform the specified request through | |
196 | * that endpoint (reading or writing a buffer). When the request completes, | |
197 | * including being canceled by usb_ep_dequeue(), the request's completion | |
198 | * routine is called to return the request to the driver. Any endpoint | |
199 | * (except control endpoints like ep0) may have more than one transfer | |
200 | * request queued; they complete in FIFO order. Once a gadget driver | |
201 | * submits a request, that request may not be examined or modified until it | |
202 | * is given back to that driver through the completion callback. | |
203 | * | |
204 | * Each request is turned into one or more packets. The controller driver | |
205 | * never merges adjacent requests into the same packet. OUT transfers | |
206 | * will sometimes use data that's already buffered in the hardware. | |
207 | * Drivers can rely on the fact that the first byte of the request's buffer | |
208 | * always corresponds to the first byte of some USB packet, for both | |
209 | * IN and OUT transfers. | |
210 | * | |
211 | * Bulk endpoints can queue any amount of data; the transfer is packetized | |
212 | * automatically. The last packet will be short if the request doesn't fill it | |
213 | * out completely. Zero length packets (ZLPs) should be avoided in portable | |
214 | * protocols since not all usb hardware can successfully handle zero length | |
215 | * packets. (ZLPs may be explicitly written, and may be implicitly written if | |
216 | * the request 'zero' flag is set.) Bulk endpoints may also be used | |
217 | * for interrupt transfers; but the reverse is not true, and some endpoints | |
218 | * won't support every interrupt transfer. (Such as 768 byte packets.) | |
219 | * | |
220 | * Interrupt-only endpoints are less functional than bulk endpoints, for | |
221 | * example by not supporting queueing or not handling buffers that are | |
222 | * larger than the endpoint's maxpacket size. They may also treat data | |
223 | * toggle differently. | |
224 | * | |
225 | * Control endpoints ... after getting a setup() callback, the driver queues | |
226 | * one response (even if it would be zero length). That enables the | |
227 | * status ack, after transferring data as specified in the response. Setup | |
228 | * functions may return negative error codes to generate protocol stalls. | |
229 | * (Note that some USB device controllers disallow protocol stall responses | |
230 | * in some cases.) When control responses are deferred (the response is | |
231 | * written after the setup callback returns), then usb_ep_set_halt() may be | |
232 | * used on ep0 to trigger protocol stalls. Depending on the controller, | |
233 | * it may not be possible to trigger a status-stage protocol stall when the | |
234 | * data stage is over, that is, from within the response's completion | |
235 | * routine. | |
236 | * | |
237 | * For periodic endpoints, like interrupt or isochronous ones, the usb host | |
238 | * arranges to poll once per interval, and the gadget driver usually will | |
239 | * have queued some data to transfer at that time. | |
240 | * | |
35c6130c FB |
241 | * Note that @req's ->complete() callback must never be called from |
242 | * within usb_ep_queue() as that can create deadlock situations. | |
243 | * | |
5a8d651a FB |
244 | * Returns zero, or a negative error code. Endpoints that are not enabled |
245 | * report errors; errors will also be | |
246 | * reported when the usb peripheral is disconnected. | |
247 | */ | |
248 | int usb_ep_queue(struct usb_ep *ep, | |
249 | struct usb_request *req, gfp_t gfp_flags) | |
250 | { | |
5e42d710 FB |
251 | int ret = 0; |
252 | ||
253 | if (WARN_ON_ONCE(!ep->enabled && ep->address)) { | |
254 | ret = -ESHUTDOWN; | |
255 | goto out; | |
256 | } | |
257 | ||
258 | ret = ep->ops->queue(ep, req, gfp_flags); | |
259 | ||
260 | out: | |
261 | trace_usb_ep_queue(ep, req, ret); | |
5a8d651a | 262 | |
5e42d710 | 263 | return ret; |
5a8d651a FB |
264 | } |
265 | EXPORT_SYMBOL_GPL(usb_ep_queue); | |
266 | ||
267 | /** | |
268 | * usb_ep_dequeue - dequeues (cancels, unlinks) an I/O request from an endpoint | |
269 | * @ep:the endpoint associated with the request | |
270 | * @req:the request being canceled | |
271 | * | |
272 | * If the request is still active on the endpoint, it is dequeued and its | |
273 | * completion routine is called (with status -ECONNRESET); else a negative | |
274 | * error code is returned. This is guaranteed to happen before the call to | |
275 | * usb_ep_dequeue() returns. | |
276 | * | |
277 | * Note that some hardware can't clear out write fifos (to unlink the request | |
278 | * at the head of the queue) except as part of disconnecting from usb. Such | |
279 | * restrictions prevent drivers from supporting configuration changes, | |
280 | * even to configuration zero (a "chapter 9" requirement). | |
281 | */ | |
282 | int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req) | |
283 | { | |
5e42d710 FB |
284 | int ret; |
285 | ||
286 | ret = ep->ops->dequeue(ep, req); | |
287 | trace_usb_ep_dequeue(ep, req, ret); | |
288 | ||
289 | return ret; | |
5a8d651a FB |
290 | } |
291 | EXPORT_SYMBOL_GPL(usb_ep_dequeue); | |
292 | ||
293 | /** | |
294 | * usb_ep_set_halt - sets the endpoint halt feature. | |
295 | * @ep: the non-isochronous endpoint being stalled | |
296 | * | |
297 | * Use this to stall an endpoint, perhaps as an error report. | |
298 | * Except for control endpoints, | |
299 | * the endpoint stays halted (will not stream any data) until the host | |
300 | * clears this feature; drivers may need to empty the endpoint's request | |
301 | * queue first, to make sure no inappropriate transfers happen. | |
302 | * | |
303 | * Note that while an endpoint CLEAR_FEATURE will be invisible to the | |
304 | * gadget driver, a SET_INTERFACE will not be. To reset endpoints for the | |
305 | * current altsetting, see usb_ep_clear_halt(). When switching altsettings, | |
306 | * it's simplest to use usb_ep_enable() or usb_ep_disable() for the endpoints. | |
307 | * | |
308 | * Returns zero, or a negative error code. On success, this call sets | |
309 | * underlying hardware state that blocks data transfers. | |
310 | * Attempts to halt IN endpoints will fail (returning -EAGAIN) if any | |
311 | * transfer requests are still queued, or if the controller hardware | |
312 | * (usually a FIFO) still holds bytes that the host hasn't collected. | |
313 | */ | |
314 | int usb_ep_set_halt(struct usb_ep *ep) | |
315 | { | |
5e42d710 FB |
316 | int ret; |
317 | ||
318 | ret = ep->ops->set_halt(ep, 1); | |
319 | trace_usb_ep_set_halt(ep, ret); | |
320 | ||
321 | return ret; | |
5a8d651a FB |
322 | } |
323 | EXPORT_SYMBOL_GPL(usb_ep_set_halt); | |
324 | ||
325 | /** | |
326 | * usb_ep_clear_halt - clears endpoint halt, and resets toggle | |
327 | * @ep:the bulk or interrupt endpoint being reset | |
328 | * | |
329 | * Use this when responding to the standard usb "set interface" request, | |
330 | * for endpoints that aren't reconfigured, after clearing any other state | |
331 | * in the endpoint's i/o queue. | |
332 | * | |
333 | * Returns zero, or a negative error code. On success, this call clears | |
334 | * the underlying hardware state reflecting endpoint halt and data toggle. | |
335 | * Note that some hardware can't support this request (like pxa2xx_udc), | |
336 | * and accordingly can't correctly implement interface altsettings. | |
337 | */ | |
338 | int usb_ep_clear_halt(struct usb_ep *ep) | |
339 | { | |
5e42d710 FB |
340 | int ret; |
341 | ||
342 | ret = ep->ops->set_halt(ep, 0); | |
343 | trace_usb_ep_clear_halt(ep, ret); | |
344 | ||
345 | return ret; | |
5a8d651a FB |
346 | } |
347 | EXPORT_SYMBOL_GPL(usb_ep_clear_halt); | |
348 | ||
349 | /** | |
350 | * usb_ep_set_wedge - sets the halt feature and ignores clear requests | |
351 | * @ep: the endpoint being wedged | |
352 | * | |
353 | * Use this to stall an endpoint and ignore CLEAR_FEATURE(HALT_ENDPOINT) | |
354 | * requests. If the gadget driver clears the halt status, it will | |
355 | * automatically unwedge the endpoint. | |
356 | * | |
357 | * Returns zero on success, else negative errno. | |
358 | */ | |
359 | int usb_ep_set_wedge(struct usb_ep *ep) | |
360 | { | |
5e42d710 FB |
361 | int ret; |
362 | ||
5a8d651a | 363 | if (ep->ops->set_wedge) |
5e42d710 | 364 | ret = ep->ops->set_wedge(ep); |
5a8d651a | 365 | else |
5e42d710 FB |
366 | ret = ep->ops->set_halt(ep, 1); |
367 | ||
368 | trace_usb_ep_set_wedge(ep, ret); | |
369 | ||
370 | return ret; | |
5a8d651a FB |
371 | } |
372 | EXPORT_SYMBOL_GPL(usb_ep_set_wedge); | |
373 | ||
374 | /** | |
375 | * usb_ep_fifo_status - returns number of bytes in fifo, or error | |
376 | * @ep: the endpoint whose fifo status is being checked. | |
377 | * | |
378 | * FIFO endpoints may have "unclaimed data" in them in certain cases, | |
379 | * such as after aborted transfers. Hosts may not have collected all | |
380 | * the IN data written by the gadget driver (and reported by a request | |
381 | * completion). The gadget driver may not have collected all the data | |
382 | * written OUT to it by the host. Drivers that need precise handling for | |
383 | * fault reporting or recovery may need to use this call. | |
384 | * | |
385 | * This returns the number of such bytes in the fifo, or a negative | |
386 | * errno if the endpoint doesn't use a FIFO or doesn't support such | |
387 | * precise handling. | |
388 | */ | |
389 | int usb_ep_fifo_status(struct usb_ep *ep) | |
390 | { | |
5e42d710 FB |
391 | int ret; |
392 | ||
5a8d651a | 393 | if (ep->ops->fifo_status) |
5e42d710 | 394 | ret = ep->ops->fifo_status(ep); |
5a8d651a | 395 | else |
5e42d710 FB |
396 | ret = -EOPNOTSUPP; |
397 | ||
398 | trace_usb_ep_fifo_status(ep, ret); | |
399 | ||
400 | return ret; | |
5a8d651a FB |
401 | } |
402 | EXPORT_SYMBOL_GPL(usb_ep_fifo_status); | |
403 | ||
404 | /** | |
405 | * usb_ep_fifo_flush - flushes contents of a fifo | |
406 | * @ep: the endpoint whose fifo is being flushed. | |
407 | * | |
408 | * This call may be used to flush the "unclaimed data" that may exist in | |
409 | * an endpoint fifo after abnormal transaction terminations. The call | |
410 | * must never be used except when endpoint is not being used for any | |
411 | * protocol translation. | |
412 | */ | |
413 | void usb_ep_fifo_flush(struct usb_ep *ep) | |
414 | { | |
415 | if (ep->ops->fifo_flush) | |
416 | ep->ops->fifo_flush(ep); | |
5e42d710 FB |
417 | |
418 | trace_usb_ep_fifo_flush(ep, 0); | |
5a8d651a FB |
419 | } |
420 | EXPORT_SYMBOL_GPL(usb_ep_fifo_flush); | |
421 | ||
422 | /* ------------------------------------------------------------------------- */ | |
423 | ||
424 | /** | |
425 | * usb_gadget_frame_number - returns the current frame number | |
426 | * @gadget: controller that reports the frame number | |
427 | * | |
428 | * Returns the usb frame number, normally eleven bits from a SOF packet, | |
429 | * or negative errno if this device doesn't support this capability. | |
430 | */ | |
431 | int usb_gadget_frame_number(struct usb_gadget *gadget) | |
432 | { | |
5e42d710 FB |
433 | int ret; |
434 | ||
435 | ret = gadget->ops->get_frame(gadget); | |
436 | ||
437 | trace_usb_gadget_frame_number(gadget, ret); | |
438 | ||
439 | return ret; | |
5a8d651a FB |
440 | } |
441 | EXPORT_SYMBOL_GPL(usb_gadget_frame_number); | |
442 | ||
443 | /** | |
444 | * usb_gadget_wakeup - tries to wake up the host connected to this gadget | |
445 | * @gadget: controller used to wake up the host | |
446 | * | |
447 | * Returns zero on success, else negative error code if the hardware | |
448 | * doesn't support such attempts, or its support has not been enabled | |
449 | * by the usb host. Drivers must return device descriptors that report | |
450 | * their ability to support this, or hosts won't enable it. | |
451 | * | |
452 | * This may also try to use SRP to wake the host and start enumeration, | |
453 | * even if OTG isn't otherwise in use. OTG devices may also start | |
454 | * remote wakeup even when hosts don't explicitly enable it. | |
455 | */ | |
456 | int usb_gadget_wakeup(struct usb_gadget *gadget) | |
457 | { | |
5e42d710 FB |
458 | int ret = 0; |
459 | ||
460 | if (!gadget->ops->wakeup) { | |
461 | ret = -EOPNOTSUPP; | |
462 | goto out; | |
463 | } | |
464 | ||
465 | ret = gadget->ops->wakeup(gadget); | |
466 | ||
467 | out: | |
468 | trace_usb_gadget_wakeup(gadget, ret); | |
469 | ||
470 | return ret; | |
5a8d651a FB |
471 | } |
472 | EXPORT_SYMBOL_GPL(usb_gadget_wakeup); | |
473 | ||
474 | /** | |
475 | * usb_gadget_set_selfpowered - sets the device selfpowered feature. | |
476 | * @gadget:the device being declared as self-powered | |
477 | * | |
478 | * this affects the device status reported by the hardware driver | |
479 | * to reflect that it now has a local power supply. | |
480 | * | |
481 | * returns zero on success, else negative errno. | |
482 | */ | |
483 | int usb_gadget_set_selfpowered(struct usb_gadget *gadget) | |
484 | { | |
5e42d710 FB |
485 | int ret = 0; |
486 | ||
487 | if (!gadget->ops->set_selfpowered) { | |
488 | ret = -EOPNOTSUPP; | |
489 | goto out; | |
490 | } | |
491 | ||
492 | ret = gadget->ops->set_selfpowered(gadget, 1); | |
493 | ||
494 | out: | |
495 | trace_usb_gadget_set_selfpowered(gadget, ret); | |
496 | ||
497 | return ret; | |
5a8d651a FB |
498 | } |
499 | EXPORT_SYMBOL_GPL(usb_gadget_set_selfpowered); | |
500 | ||
501 | /** | |
502 | * usb_gadget_clear_selfpowered - clear the device selfpowered feature. | |
503 | * @gadget:the device being declared as bus-powered | |
504 | * | |
505 | * this affects the device status reported by the hardware driver. | |
506 | * some hardware may not support bus-powered operation, in which | |
507 | * case this feature's value can never change. | |
508 | * | |
509 | * returns zero on success, else negative errno. | |
510 | */ | |
511 | int usb_gadget_clear_selfpowered(struct usb_gadget *gadget) | |
512 | { | |
5e42d710 FB |
513 | int ret = 0; |
514 | ||
515 | if (!gadget->ops->set_selfpowered) { | |
516 | ret = -EOPNOTSUPP; | |
517 | goto out; | |
518 | } | |
519 | ||
520 | ret = gadget->ops->set_selfpowered(gadget, 0); | |
521 | ||
522 | out: | |
523 | trace_usb_gadget_clear_selfpowered(gadget, ret); | |
524 | ||
525 | return ret; | |
5a8d651a FB |
526 | } |
527 | EXPORT_SYMBOL_GPL(usb_gadget_clear_selfpowered); | |
528 | ||
529 | /** | |
530 | * usb_gadget_vbus_connect - Notify controller that VBUS is powered | |
531 | * @gadget:The device which now has VBUS power. | |
532 | * Context: can sleep | |
533 | * | |
534 | * This call is used by a driver for an external transceiver (or GPIO) | |
535 | * that detects a VBUS power session starting. Common responses include | |
536 | * resuming the controller, activating the D+ (or D-) pullup to let the | |
537 | * host detect that a USB device is attached, and starting to draw power | |
538 | * (8mA or possibly more, especially after SET_CONFIGURATION). | |
539 | * | |
540 | * Returns zero on success, else negative errno. | |
541 | */ | |
542 | int usb_gadget_vbus_connect(struct usb_gadget *gadget) | |
543 | { | |
5e42d710 FB |
544 | int ret = 0; |
545 | ||
546 | if (!gadget->ops->vbus_session) { | |
547 | ret = -EOPNOTSUPP; | |
548 | goto out; | |
549 | } | |
550 | ||
551 | ret = gadget->ops->vbus_session(gadget, 1); | |
552 | ||
553 | out: | |
554 | trace_usb_gadget_vbus_connect(gadget, ret); | |
555 | ||
556 | return ret; | |
5a8d651a FB |
557 | } |
558 | EXPORT_SYMBOL_GPL(usb_gadget_vbus_connect); | |
559 | ||
560 | /** | |
561 | * usb_gadget_vbus_draw - constrain controller's VBUS power usage | |
562 | * @gadget:The device whose VBUS usage is being described | |
563 | * @mA:How much current to draw, in milliAmperes. This should be twice | |
564 | * the value listed in the configuration descriptor bMaxPower field. | |
565 | * | |
566 | * This call is used by gadget drivers during SET_CONFIGURATION calls, | |
567 | * reporting how much power the device may consume. For example, this | |
568 | * could affect how quickly batteries are recharged. | |
569 | * | |
570 | * Returns zero on success, else negative errno. | |
571 | */ | |
572 | int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) | |
573 | { | |
5e42d710 FB |
574 | int ret = 0; |
575 | ||
576 | if (!gadget->ops->vbus_draw) { | |
577 | ret = -EOPNOTSUPP; | |
578 | goto out; | |
579 | } | |
580 | ||
581 | ret = gadget->ops->vbus_draw(gadget, mA); | |
582 | if (!ret) | |
583 | gadget->mA = mA; | |
584 | ||
585 | out: | |
586 | trace_usb_gadget_vbus_draw(gadget, ret); | |
587 | ||
588 | return ret; | |
5a8d651a FB |
589 | } |
590 | EXPORT_SYMBOL_GPL(usb_gadget_vbus_draw); | |
591 | ||
592 | /** | |
593 | * usb_gadget_vbus_disconnect - notify controller about VBUS session end | |
594 | * @gadget:the device whose VBUS supply is being described | |
595 | * Context: can sleep | |
596 | * | |
597 | * This call is used by a driver for an external transceiver (or GPIO) | |
598 | * that detects a VBUS power session ending. Common responses include | |
599 | * reversing everything done in usb_gadget_vbus_connect(). | |
600 | * | |
601 | * Returns zero on success, else negative errno. | |
602 | */ | |
603 | int usb_gadget_vbus_disconnect(struct usb_gadget *gadget) | |
604 | { | |
5e42d710 FB |
605 | int ret = 0; |
606 | ||
607 | if (!gadget->ops->vbus_session) { | |
608 | ret = -EOPNOTSUPP; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | ret = gadget->ops->vbus_session(gadget, 0); | |
613 | ||
614 | out: | |
615 | trace_usb_gadget_vbus_disconnect(gadget, ret); | |
616 | ||
617 | return ret; | |
5a8d651a FB |
618 | } |
619 | EXPORT_SYMBOL_GPL(usb_gadget_vbus_disconnect); | |
620 | ||
621 | /** | |
622 | * usb_gadget_connect - software-controlled connect to USB host | |
623 | * @gadget:the peripheral being connected | |
624 | * | |
625 | * Enables the D+ (or potentially D-) pullup. The host will start | |
626 | * enumerating this gadget when the pullup is active and a VBUS session | |
627 | * is active (the link is powered). This pullup is always enabled unless | |
628 | * usb_gadget_disconnect() has been used to disable it. | |
629 | * | |
630 | * Returns zero on success, else negative errno. | |
631 | */ | |
632 | int usb_gadget_connect(struct usb_gadget *gadget) | |
633 | { | |
5e42d710 | 634 | int ret = 0; |
5a8d651a | 635 | |
5e42d710 FB |
636 | if (!gadget->ops->pullup) { |
637 | ret = -EOPNOTSUPP; | |
638 | goto out; | |
639 | } | |
5a8d651a FB |
640 | |
641 | if (gadget->deactivated) { | |
642 | /* | |
643 | * If gadget is deactivated we only save new state. | |
644 | * Gadget will be connected automatically after activation. | |
645 | */ | |
646 | gadget->connected = true; | |
5e42d710 | 647 | goto out; |
5a8d651a FB |
648 | } |
649 | ||
650 | ret = gadget->ops->pullup(gadget, 1); | |
651 | if (!ret) | |
652 | gadget->connected = 1; | |
5e42d710 FB |
653 | |
654 | out: | |
655 | trace_usb_gadget_connect(gadget, ret); | |
656 | ||
5a8d651a FB |
657 | return ret; |
658 | } | |
659 | EXPORT_SYMBOL_GPL(usb_gadget_connect); | |
660 | ||
661 | /** | |
662 | * usb_gadget_disconnect - software-controlled disconnect from USB host | |
663 | * @gadget:the peripheral being disconnected | |
664 | * | |
665 | * Disables the D+ (or potentially D-) pullup, which the host may see | |
666 | * as a disconnect (when a VBUS session is active). Not all systems | |
667 | * support software pullup controls. | |
668 | * | |
669 | * Returns zero on success, else negative errno. | |
670 | */ | |
671 | int usb_gadget_disconnect(struct usb_gadget *gadget) | |
672 | { | |
5e42d710 | 673 | int ret = 0; |
5a8d651a | 674 | |
5e42d710 FB |
675 | if (!gadget->ops->pullup) { |
676 | ret = -EOPNOTSUPP; | |
677 | goto out; | |
678 | } | |
5a8d651a FB |
679 | |
680 | if (gadget->deactivated) { | |
681 | /* | |
682 | * If gadget is deactivated we only save new state. | |
683 | * Gadget will stay disconnected after activation. | |
684 | */ | |
685 | gadget->connected = false; | |
5e42d710 | 686 | goto out; |
5a8d651a FB |
687 | } |
688 | ||
689 | ret = gadget->ops->pullup(gadget, 0); | |
690 | if (!ret) | |
691 | gadget->connected = 0; | |
5e42d710 FB |
692 | |
693 | out: | |
694 | trace_usb_gadget_disconnect(gadget, ret); | |
695 | ||
5a8d651a FB |
696 | return ret; |
697 | } | |
698 | EXPORT_SYMBOL_GPL(usb_gadget_disconnect); | |
699 | ||
700 | /** | |
701 | * usb_gadget_deactivate - deactivate function which is not ready to work | |
702 | * @gadget: the peripheral being deactivated | |
703 | * | |
704 | * This routine may be used during the gadget driver bind() call to prevent | |
705 | * the peripheral from ever being visible to the USB host, unless later | |
706 | * usb_gadget_activate() is called. For example, user mode components may | |
707 | * need to be activated before the system can talk to hosts. | |
708 | * | |
709 | * Returns zero on success, else negative errno. | |
710 | */ | |
711 | int usb_gadget_deactivate(struct usb_gadget *gadget) | |
712 | { | |
5e42d710 | 713 | int ret = 0; |
5a8d651a FB |
714 | |
715 | if (gadget->deactivated) | |
5e42d710 | 716 | goto out; |
5a8d651a FB |
717 | |
718 | if (gadget->connected) { | |
719 | ret = usb_gadget_disconnect(gadget); | |
720 | if (ret) | |
5e42d710 FB |
721 | goto out; |
722 | ||
5a8d651a FB |
723 | /* |
724 | * If gadget was being connected before deactivation, we want | |
725 | * to reconnect it in usb_gadget_activate(). | |
726 | */ | |
727 | gadget->connected = true; | |
728 | } | |
729 | gadget->deactivated = true; | |
730 | ||
5e42d710 FB |
731 | out: |
732 | trace_usb_gadget_deactivate(gadget, ret); | |
733 | ||
734 | return ret; | |
5a8d651a FB |
735 | } |
736 | EXPORT_SYMBOL_GPL(usb_gadget_deactivate); | |
737 | ||
738 | /** | |
739 | * usb_gadget_activate - activate function which is not ready to work | |
740 | * @gadget: the peripheral being activated | |
741 | * | |
742 | * This routine activates gadget which was previously deactivated with | |
743 | * usb_gadget_deactivate() call. It calls usb_gadget_connect() if needed. | |
744 | * | |
745 | * Returns zero on success, else negative errno. | |
746 | */ | |
747 | int usb_gadget_activate(struct usb_gadget *gadget) | |
748 | { | |
5e42d710 FB |
749 | int ret = 0; |
750 | ||
5a8d651a | 751 | if (!gadget->deactivated) |
5e42d710 | 752 | goto out; |
5a8d651a FB |
753 | |
754 | gadget->deactivated = false; | |
755 | ||
756 | /* | |
757 | * If gadget has been connected before deactivation, or became connected | |
758 | * while it was being deactivated, we call usb_gadget_connect(). | |
759 | */ | |
760 | if (gadget->connected) | |
5e42d710 | 761 | ret = usb_gadget_connect(gadget); |
5a8d651a | 762 | |
5e42d710 FB |
763 | out: |
764 | trace_usb_gadget_activate(gadget, ret); | |
765 | ||
766 | return ret; | |
5a8d651a FB |
767 | } |
768 | EXPORT_SYMBOL_GPL(usb_gadget_activate); | |
769 | ||
770 | /* ------------------------------------------------------------------------- */ | |
771 | ||
908b9613 AS |
772 | #ifdef CONFIG_HAS_DMA |
773 | ||
679ca39f | 774 | int usb_gadget_map_request_by_dev(struct device *dev, |
a698908d FB |
775 | struct usb_request *req, int is_in) |
776 | { | |
777 | if (req->length == 0) | |
778 | return 0; | |
779 | ||
780 | if (req->num_sgs) { | |
781 | int mapped; | |
782 | ||
7ace8fc8 | 783 | mapped = dma_map_sg(dev, req->sg, req->num_sgs, |
a698908d FB |
784 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
785 | if (mapped == 0) { | |
5096c4d3 | 786 | dev_err(dev, "failed to map SGs\n"); |
a698908d FB |
787 | return -EFAULT; |
788 | } | |
789 | ||
790 | req->num_mapped_sgs = mapped; | |
791 | } else { | |
614536da FF |
792 | if (is_vmalloc_addr(req->buf)) { |
793 | dev_err(dev, "buffer is not dma capable\n"); | |
794 | return -EFAULT; | |
795 | } else if (object_is_on_stack(req->buf)) { | |
796 | dev_err(dev, "buffer is on stack\n"); | |
797 | return -EFAULT; | |
798 | } | |
799 | ||
7ace8fc8 | 800 | req->dma = dma_map_single(dev, req->buf, req->length, |
a698908d FB |
801 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
802 | ||
7ace8fc8 YS |
803 | if (dma_mapping_error(dev, req->dma)) { |
804 | dev_err(dev, "failed to map buffer\n"); | |
a698908d FB |
805 | return -EFAULT; |
806 | } | |
31fe084f JP |
807 | |
808 | req->dma_mapped = 1; | |
a698908d FB |
809 | } |
810 | ||
811 | return 0; | |
812 | } | |
679ca39f YS |
813 | EXPORT_SYMBOL_GPL(usb_gadget_map_request_by_dev); |
814 | ||
815 | int usb_gadget_map_request(struct usb_gadget *gadget, | |
816 | struct usb_request *req, int is_in) | |
817 | { | |
818 | return usb_gadget_map_request_by_dev(gadget->dev.parent, req, is_in); | |
819 | } | |
a698908d FB |
820 | EXPORT_SYMBOL_GPL(usb_gadget_map_request); |
821 | ||
679ca39f | 822 | void usb_gadget_unmap_request_by_dev(struct device *dev, |
a698908d FB |
823 | struct usb_request *req, int is_in) |
824 | { | |
825 | if (req->length == 0) | |
826 | return; | |
827 | ||
828 | if (req->num_mapped_sgs) { | |
23fd537c | 829 | dma_unmap_sg(dev, req->sg, req->num_sgs, |
a698908d FB |
830 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
831 | ||
832 | req->num_mapped_sgs = 0; | |
31fe084f | 833 | } else if (req->dma_mapped) { |
679ca39f | 834 | dma_unmap_single(dev, req->dma, req->length, |
a698908d | 835 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
31fe084f | 836 | req->dma_mapped = 0; |
a698908d FB |
837 | } |
838 | } | |
679ca39f YS |
839 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request_by_dev); |
840 | ||
841 | void usb_gadget_unmap_request(struct usb_gadget *gadget, | |
842 | struct usb_request *req, int is_in) | |
843 | { | |
844 | usb_gadget_unmap_request_by_dev(gadget->dev.parent, req, is_in); | |
845 | } | |
a698908d FB |
846 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); |
847 | ||
908b9613 AS |
848 | #endif /* CONFIG_HAS_DMA */ |
849 | ||
a698908d FB |
850 | /* ------------------------------------------------------------------------- */ |
851 | ||
3fc2aa55 MS |
852 | /** |
853 | * usb_gadget_giveback_request - give the request back to the gadget layer | |
854 | * Context: in_interrupt() | |
855 | * | |
856 | * This is called by device controller drivers in order to return the | |
857 | * completed request back to the gadget layer. | |
858 | */ | |
859 | void usb_gadget_giveback_request(struct usb_ep *ep, | |
860 | struct usb_request *req) | |
861 | { | |
0cfbd328 MS |
862 | if (likely(req->status == 0)) |
863 | usb_led_activity(USB_LED_EVENT_GADGET); | |
864 | ||
5e42d710 FB |
865 | trace_usb_gadget_giveback_request(ep, req, 0); |
866 | ||
3fc2aa55 MS |
867 | req->complete(ep, req); |
868 | } | |
869 | EXPORT_SYMBOL_GPL(usb_gadget_giveback_request); | |
870 | ||
871 | /* ------------------------------------------------------------------------- */ | |
872 | ||
b0aea003 RB |
873 | /** |
874 | * gadget_find_ep_by_name - returns ep whose name is the same as sting passed | |
875 | * in second parameter or NULL if searched endpoint not found | |
876 | * @g: controller to check for quirk | |
877 | * @name: name of searched endpoint | |
878 | */ | |
879 | struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name) | |
880 | { | |
881 | struct usb_ep *ep; | |
882 | ||
883 | gadget_for_each_ep(ep, g) { | |
884 | if (!strcmp(ep->name, name)) | |
885 | return ep; | |
886 | } | |
887 | ||
888 | return NULL; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(gadget_find_ep_by_name); | |
891 | ||
892 | /* ------------------------------------------------------------------------- */ | |
893 | ||
4278c687 RB |
894 | int usb_gadget_ep_match_desc(struct usb_gadget *gadget, |
895 | struct usb_ep *ep, struct usb_endpoint_descriptor *desc, | |
896 | struct usb_ss_ep_comp_descriptor *ep_comp) | |
897 | { | |
898 | u8 type; | |
899 | u16 max; | |
900 | int num_req_streams = 0; | |
901 | ||
902 | /* endpoint already claimed? */ | |
903 | if (ep->claimed) | |
904 | return 0; | |
905 | ||
906 | type = usb_endpoint_type(desc); | |
99bcb238 | 907 | max = usb_endpoint_maxp(desc); |
4278c687 RB |
908 | |
909 | if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in) | |
910 | return 0; | |
911 | if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out) | |
912 | return 0; | |
913 | ||
914 | if (max > ep->maxpacket_limit) | |
915 | return 0; | |
916 | ||
917 | /* "high bandwidth" works only at high speed */ | |
9bb046e4 | 918 | if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp_mult(desc) > 1) |
4278c687 RB |
919 | return 0; |
920 | ||
921 | switch (type) { | |
922 | case USB_ENDPOINT_XFER_CONTROL: | |
923 | /* only support ep0 for portable CONTROL traffic */ | |
924 | return 0; | |
925 | case USB_ENDPOINT_XFER_ISOC: | |
926 | if (!ep->caps.type_iso) | |
927 | return 0; | |
928 | /* ISO: limit 1023 bytes full speed, 1024 high/super speed */ | |
929 | if (!gadget_is_dualspeed(gadget) && max > 1023) | |
930 | return 0; | |
931 | break; | |
932 | case USB_ENDPOINT_XFER_BULK: | |
933 | if (!ep->caps.type_bulk) | |
934 | return 0; | |
935 | if (ep_comp && gadget_is_superspeed(gadget)) { | |
936 | /* Get the number of required streams from the | |
937 | * EP companion descriptor and see if the EP | |
938 | * matches it | |
939 | */ | |
940 | num_req_streams = ep_comp->bmAttributes & 0x1f; | |
941 | if (num_req_streams > ep->max_streams) | |
942 | return 0; | |
943 | } | |
944 | break; | |
945 | case USB_ENDPOINT_XFER_INT: | |
946 | /* Bulk endpoints handle interrupt transfers, | |
947 | * except the toggle-quirky iso-synch kind | |
948 | */ | |
949 | if (!ep->caps.type_int && !ep->caps.type_bulk) | |
950 | return 0; | |
951 | /* INT: limit 64 bytes full speed, 1024 high/super speed */ | |
952 | if (!gadget_is_dualspeed(gadget) && max > 64) | |
953 | return 0; | |
954 | break; | |
955 | } | |
956 | ||
957 | return 1; | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); | |
960 | ||
961 | /* ------------------------------------------------------------------------- */ | |
962 | ||
5702f753 FB |
963 | static void usb_gadget_state_work(struct work_struct *work) |
964 | { | |
dfea9c94 PC |
965 | struct usb_gadget *gadget = work_to_gadget(work); |
966 | struct usb_udc *udc = gadget->udc; | |
5702f753 | 967 | |
dfea9c94 PC |
968 | if (udc) |
969 | sysfs_notify(&udc->dev.kobj, NULL, "state"); | |
5702f753 FB |
970 | } |
971 | ||
49401f41 FB |
972 | void usb_gadget_set_state(struct usb_gadget *gadget, |
973 | enum usb_device_state state) | |
974 | { | |
975 | gadget->state = state; | |
5702f753 | 976 | schedule_work(&gadget->work); |
49401f41 FB |
977 | } |
978 | EXPORT_SYMBOL_GPL(usb_gadget_set_state); | |
979 | ||
980 | /* ------------------------------------------------------------------------- */ | |
981 | ||
628ef0d2 PC |
982 | static void usb_udc_connect_control(struct usb_udc *udc) |
983 | { | |
984 | if (udc->vbus) | |
985 | usb_gadget_connect(udc->gadget); | |
986 | else | |
987 | usb_gadget_disconnect(udc->gadget); | |
988 | } | |
989 | ||
990 | /** | |
991 | * usb_udc_vbus_handler - updates the udc core vbus status, and try to | |
992 | * connect or disconnect gadget | |
993 | * @gadget: The gadget which vbus change occurs | |
994 | * @status: The vbus status | |
995 | * | |
996 | * The udc driver calls it when it wants to connect or disconnect gadget | |
997 | * according to vbus status. | |
998 | */ | |
999 | void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) | |
1000 | { | |
1001 | struct usb_udc *udc = gadget->udc; | |
1002 | ||
1003 | if (udc) { | |
1004 | udc->vbus = status; | |
1005 | usb_udc_connect_control(udc); | |
1006 | } | |
1007 | } | |
1008 | EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); | |
1009 | ||
974a70bd PC |
1010 | /** |
1011 | * usb_gadget_udc_reset - notifies the udc core that bus reset occurs | |
1012 | * @gadget: The gadget which bus reset occurs | |
1013 | * @driver: The gadget driver we want to notify | |
1014 | * | |
1015 | * If the udc driver has bus reset handler, it needs to call this when the bus | |
1016 | * reset occurs, it notifies the gadget driver that the bus reset occurs as | |
1017 | * well as updates gadget state. | |
1018 | */ | |
1019 | void usb_gadget_udc_reset(struct usb_gadget *gadget, | |
1020 | struct usb_gadget_driver *driver) | |
1021 | { | |
1022 | driver->reset(gadget); | |
1023 | usb_gadget_set_state(gadget, USB_STATE_DEFAULT); | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(usb_gadget_udc_reset); | |
1026 | ||
352c2dc8 SAS |
1027 | /** |
1028 | * usb_gadget_udc_start - tells usb device controller to start up | |
2c683347 | 1029 | * @udc: The UDC to be started |
352c2dc8 SAS |
1030 | * |
1031 | * This call is issued by the UDC Class driver when it's about | |
1032 | * to register a gadget driver to the device controller, before | |
1033 | * calling gadget driver's bind() method. | |
1034 | * | |
1035 | * It allows the controller to be powered off until strictly | |
1036 | * necessary to have it powered on. | |
1037 | * | |
1038 | * Returns zero on success, else negative errno. | |
1039 | */ | |
2c683347 | 1040 | static inline int usb_gadget_udc_start(struct usb_udc *udc) |
352c2dc8 | 1041 | { |
2c683347 | 1042 | return udc->gadget->ops->udc_start(udc->gadget, udc->driver); |
352c2dc8 SAS |
1043 | } |
1044 | ||
352c2dc8 SAS |
1045 | /** |
1046 | * usb_gadget_udc_stop - tells usb device controller we don't need it anymore | |
1047 | * @gadget: The device we want to stop activity | |
1048 | * @driver: The driver to unbind from @gadget | |
1049 | * | |
1050 | * This call is issued by the UDC Class driver after calling | |
1051 | * gadget driver's unbind() method. | |
1052 | * | |
1053 | * The details are implementation specific, but it can go as | |
1054 | * far as powering off UDC completely and disable its data | |
1055 | * line pullups. | |
1056 | */ | |
2c683347 | 1057 | static inline void usb_gadget_udc_stop(struct usb_udc *udc) |
352c2dc8 | 1058 | { |
22835b80 | 1059 | udc->gadget->ops->udc_stop(udc->gadget); |
352c2dc8 SAS |
1060 | } |
1061 | ||
67fdfda4 FB |
1062 | /** |
1063 | * usb_gadget_udc_set_speed - tells usb device controller speed supported by | |
1064 | * current driver | |
1065 | * @udc: The device we want to set maximum speed | |
1066 | * @speed: The maximum speed to allowed to run | |
1067 | * | |
1068 | * This call is issued by the UDC Class driver before calling | |
1069 | * usb_gadget_udc_start() in order to make sure that we don't try to | |
1070 | * connect on speeds the gadget driver doesn't support. | |
1071 | */ | |
1072 | static inline void usb_gadget_udc_set_speed(struct usb_udc *udc, | |
1073 | enum usb_device_speed speed) | |
1074 | { | |
a4f0927e RQ |
1075 | if (udc->gadget->ops->udc_set_speed) { |
1076 | enum usb_device_speed s; | |
1077 | ||
1078 | s = min(speed, udc->gadget->max_speed); | |
1079 | udc->gadget->ops->udc_set_speed(udc->gadget, s); | |
1080 | } | |
67fdfda4 FB |
1081 | } |
1082 | ||
2ccea03a FB |
1083 | /** |
1084 | * usb_udc_release - release the usb_udc struct | |
1085 | * @dev: the dev member within usb_udc | |
1086 | * | |
1087 | * This is called by driver's core in order to free memory once the last | |
1088 | * reference is released. | |
1089 | */ | |
1090 | static void usb_udc_release(struct device *dev) | |
1091 | { | |
1092 | struct usb_udc *udc; | |
1093 | ||
1094 | udc = container_of(dev, struct usb_udc, dev); | |
1095 | dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); | |
1096 | kfree(udc); | |
1097 | } | |
1098 | ||
019f976e | 1099 | static const struct attribute_group *usb_udc_attr_groups[]; |
792bfcf7 FB |
1100 | |
1101 | static void usb_udc_nop_release(struct device *dev) | |
1102 | { | |
1103 | dev_vdbg(dev, "%s\n", __func__); | |
1104 | } | |
1105 | ||
8236800d KO |
1106 | /* should be called with udc_lock held */ |
1107 | static int check_pending_gadget_drivers(struct usb_udc *udc) | |
1108 | { | |
1109 | struct usb_gadget_driver *driver; | |
1110 | int ret = 0; | |
1111 | ||
1112 | list_for_each_entry(driver, &gadget_driver_pending_list, pending) | |
1113 | if (!driver->udc_name || strcmp(driver->udc_name, | |
1114 | dev_name(&udc->dev)) == 0) { | |
1115 | ret = udc_bind_to_driver(udc, driver); | |
1116 | if (ret != -EPROBE_DEFER) | |
1117 | list_del(&driver->pending); | |
1118 | break; | |
1119 | } | |
1120 | ||
1121 | return ret; | |
1122 | } | |
1123 | ||
2ccea03a | 1124 | /** |
792bfcf7 FB |
1125 | * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list |
1126 | * @parent: the parent device to this udc. Usually the controller driver's | |
1127 | * device. | |
1128 | * @gadget: the gadget to be added to the list. | |
1129 | * @release: a gadget release function. | |
2ccea03a FB |
1130 | * |
1131 | * Returns zero on success, negative errno otherwise. | |
afd7fd81 | 1132 | * Calls the gadget release function in the latter case. |
2ccea03a | 1133 | */ |
792bfcf7 FB |
1134 | int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, |
1135 | void (*release)(struct device *dev)) | |
2ccea03a FB |
1136 | { |
1137 | struct usb_udc *udc; | |
1138 | int ret = -ENOMEM; | |
1139 | ||
7bce401c | 1140 | dev_set_name(&gadget->dev, "gadget"); |
5702f753 | 1141 | INIT_WORK(&gadget->work, usb_gadget_state_work); |
2ed14320 | 1142 | gadget->dev.parent = parent; |
f07bd56b | 1143 | |
ddf47ccb | 1144 | if (release) |
792bfcf7 | 1145 | gadget->dev.release = release; |
ddf47ccb FB |
1146 | else |
1147 | gadget->dev.release = usb_udc_nop_release; | |
792bfcf7 | 1148 | |
afd7fd81 AS |
1149 | device_initialize(&gadget->dev); |
1150 | ||
1151 | udc = kzalloc(sizeof(*udc), GFP_KERNEL); | |
1152 | if (!udc) | |
7ae2c3c2 | 1153 | goto err_put_gadget; |
f07bd56b | 1154 | |
2ccea03a FB |
1155 | device_initialize(&udc->dev); |
1156 | udc->dev.release = usb_udc_release; | |
1157 | udc->dev.class = udc_class; | |
019f976e | 1158 | udc->dev.groups = usb_udc_attr_groups; |
2ccea03a FB |
1159 | udc->dev.parent = parent; |
1160 | ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); | |
1161 | if (ret) | |
7ae2c3c2 AS |
1162 | goto err_put_udc; |
1163 | ||
1164 | ret = device_add(&gadget->dev); | |
1165 | if (ret) | |
1166 | goto err_put_udc; | |
2ccea03a FB |
1167 | |
1168 | udc->gadget = gadget; | |
dfea9c94 | 1169 | gadget->udc = udc; |
2ccea03a FB |
1170 | |
1171 | mutex_lock(&udc_lock); | |
1172 | list_add_tail(&udc->list, &udc_list); | |
1173 | ||
1174 | ret = device_add(&udc->dev); | |
1175 | if (ret) | |
7ae2c3c2 | 1176 | goto err_unlist_udc; |
2ccea03a | 1177 | |
49401f41 | 1178 | usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); |
628ef0d2 | 1179 | udc->vbus = true; |
2ccea03a | 1180 | |
855ed04a | 1181 | /* pick up one of pending gadget drivers */ |
8236800d KO |
1182 | ret = check_pending_gadget_drivers(udc); |
1183 | if (ret) | |
7ae2c3c2 | 1184 | goto err_del_udc; |
855ed04a | 1185 | |
2ccea03a FB |
1186 | mutex_unlock(&udc_lock); |
1187 | ||
1188 | return 0; | |
f07bd56b | 1189 | |
7ae2c3c2 | 1190 | err_del_udc: |
17a1dc5e PC |
1191 | device_del(&udc->dev); |
1192 | ||
7ae2c3c2 | 1193 | err_unlist_udc: |
2ccea03a FB |
1194 | list_del(&udc->list); |
1195 | mutex_unlock(&udc_lock); | |
1196 | ||
c93e64e9 | 1197 | device_del(&gadget->dev); |
2ccea03a | 1198 | |
7ae2c3c2 AS |
1199 | err_put_udc: |
1200 | put_device(&udc->dev); | |
7bce401c | 1201 | |
7ae2c3c2 | 1202 | err_put_gadget: |
afd7fd81 | 1203 | put_device(&gadget->dev); |
2ccea03a FB |
1204 | return ret; |
1205 | } | |
792bfcf7 FB |
1206 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); |
1207 | ||
175f7121 MS |
1208 | /** |
1209 | * usb_get_gadget_udc_name - get the name of the first UDC controller | |
1210 | * This functions returns the name of the first UDC controller in the system. | |
1211 | * Please note that this interface is usefull only for legacy drivers which | |
1212 | * assume that there is only one UDC controller in the system and they need to | |
1213 | * get its name before initialization. There is no guarantee that the UDC | |
1214 | * of the returned name will be still available, when gadget driver registers | |
1215 | * itself. | |
1216 | * | |
1217 | * Returns pointer to string with UDC controller name on success, NULL | |
1218 | * otherwise. Caller should kfree() returned string. | |
1219 | */ | |
1220 | char *usb_get_gadget_udc_name(void) | |
1221 | { | |
1222 | struct usb_udc *udc; | |
1223 | char *name = NULL; | |
1224 | ||
1225 | /* For now we take the first available UDC */ | |
1226 | mutex_lock(&udc_lock); | |
1227 | list_for_each_entry(udc, &udc_list, list) { | |
1228 | if (!udc->driver) { | |
1229 | name = kstrdup(udc->gadget->name, GFP_KERNEL); | |
1230 | break; | |
1231 | } | |
1232 | } | |
1233 | mutex_unlock(&udc_lock); | |
1234 | return name; | |
1235 | } | |
1236 | EXPORT_SYMBOL_GPL(usb_get_gadget_udc_name); | |
1237 | ||
792bfcf7 FB |
1238 | /** |
1239 | * usb_add_gadget_udc - adds a new gadget to the udc class driver list | |
1240 | * @parent: the parent device to this udc. Usually the controller | |
1241 | * driver's device. | |
1242 | * @gadget: the gadget to be added to the list | |
1243 | * | |
1244 | * Returns zero on success, negative errno otherwise. | |
1245 | */ | |
1246 | int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget) | |
1247 | { | |
1248 | return usb_add_gadget_udc_release(parent, gadget, NULL); | |
1249 | } | |
2ccea03a FB |
1250 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc); |
1251 | ||
1252 | static void usb_gadget_remove_driver(struct usb_udc *udc) | |
1253 | { | |
1254 | dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", | |
8da9fe8a | 1255 | udc->driver->function); |
2ccea03a FB |
1256 | |
1257 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
1258 | ||
2d7ebbb0 FB |
1259 | usb_gadget_disconnect(udc->gadget); |
1260 | udc->driver->disconnect(udc->gadget); | |
1261 | udc->driver->unbind(udc->gadget); | |
2c683347 | 1262 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
1263 | |
1264 | udc->driver = NULL; | |
1265 | udc->dev.driver = NULL; | |
70d3a498 | 1266 | udc->gadget->dev.driver = NULL; |
2ccea03a FB |
1267 | } |
1268 | ||
1269 | /** | |
1270 | * usb_del_gadget_udc - deletes @udc from udc_list | |
1271 | * @gadget: the gadget to be removed. | |
1272 | * | |
1273 | * This, will call usb_gadget_unregister_driver() if | |
1274 | * the @udc is still busy. | |
1275 | */ | |
1276 | void usb_del_gadget_udc(struct usb_gadget *gadget) | |
1277 | { | |
dfea9c94 | 1278 | struct usb_udc *udc = gadget->udc; |
2ccea03a | 1279 | |
dfea9c94 PC |
1280 | if (!udc) |
1281 | return; | |
2ccea03a | 1282 | |
2ccea03a FB |
1283 | dev_vdbg(gadget->dev.parent, "unregistering gadget\n"); |
1284 | ||
dfea9c94 | 1285 | mutex_lock(&udc_lock); |
2ccea03a | 1286 | list_del(&udc->list); |
2ccea03a | 1287 | |
855ed04a RB |
1288 | if (udc->driver) { |
1289 | struct usb_gadget_driver *driver = udc->driver; | |
1290 | ||
2ccea03a | 1291 | usb_gadget_remove_driver(udc); |
855ed04a RB |
1292 | list_add(&driver->pending, &gadget_driver_pending_list); |
1293 | } | |
1294 | mutex_unlock(&udc_lock); | |
2ccea03a FB |
1295 | |
1296 | kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); | |
5702f753 | 1297 | flush_work(&gadget->work); |
2ccea03a | 1298 | device_unregister(&udc->dev); |
7bce401c | 1299 | device_unregister(&gadget->dev); |
fac32347 | 1300 | memset(&gadget->dev, 0x00, sizeof(gadget->dev)); |
2ccea03a FB |
1301 | } |
1302 | EXPORT_SYMBOL_GPL(usb_del_gadget_udc); | |
1303 | ||
1304 | /* ------------------------------------------------------------------------- */ | |
1305 | ||
4c49a5f0 | 1306 | static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) |
2ccea03a | 1307 | { |
4c49a5f0 | 1308 | int ret; |
2ccea03a | 1309 | |
2ccea03a FB |
1310 | dev_dbg(&udc->dev, "registering UDC driver [%s]\n", |
1311 | driver->function); | |
1312 | ||
1313 | udc->driver = driver; | |
1314 | udc->dev.driver = &driver->driver; | |
70d3a498 | 1315 | udc->gadget->dev.driver = &driver->driver; |
2ccea03a | 1316 | |
97e133d5 | 1317 | usb_gadget_udc_set_speed(udc, driver->max_speed); |
67fdfda4 | 1318 | |
2d7ebbb0 FB |
1319 | ret = driver->bind(udc->gadget, driver); |
1320 | if (ret) | |
1321 | goto err1; | |
2c683347 | 1322 | ret = usb_gadget_udc_start(udc); |
2d7ebbb0 FB |
1323 | if (ret) { |
1324 | driver->unbind(udc->gadget); | |
1325 | goto err1; | |
352c2dc8 | 1326 | } |
628ef0d2 | 1327 | usb_udc_connect_control(udc); |
2ccea03a FB |
1328 | |
1329 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
2ccea03a | 1330 | return 0; |
2ccea03a | 1331 | err1: |
f8cffc84 FE |
1332 | if (ret != -EISNAM) |
1333 | dev_err(&udc->dev, "failed to start %s: %d\n", | |
2ccea03a FB |
1334 | udc->driver->function, ret); |
1335 | udc->driver = NULL; | |
1336 | udc->dev.driver = NULL; | |
70d3a498 | 1337 | udc->gadget->dev.driver = NULL; |
4c49a5f0 SAS |
1338 | return ret; |
1339 | } | |
1340 | ||
4c49a5f0 SAS |
1341 | int usb_gadget_probe_driver(struct usb_gadget_driver *driver) |
1342 | { | |
1343 | struct usb_udc *udc = NULL; | |
2284b29d | 1344 | int ret = -ENODEV; |
4c49a5f0 SAS |
1345 | |
1346 | if (!driver || !driver->bind || !driver->setup) | |
1347 | return -EINVAL; | |
1348 | ||
1349 | mutex_lock(&udc_lock); | |
2284b29d RB |
1350 | if (driver->udc_name) { |
1351 | list_for_each_entry(udc, &udc_list, list) { | |
1352 | ret = strcmp(driver->udc_name, dev_name(&udc->dev)); | |
1353 | if (!ret) | |
1354 | break; | |
1355 | } | |
7b017381 FH |
1356 | if (ret) |
1357 | ret = -ENODEV; | |
1358 | else if (udc->driver) | |
1359 | ret = -EBUSY; | |
1360 | else | |
4c49a5f0 | 1361 | goto found; |
2284b29d RB |
1362 | } else { |
1363 | list_for_each_entry(udc, &udc_list, list) { | |
1364 | /* For now we take the first one */ | |
1365 | if (!udc->driver) | |
1366 | goto found; | |
1367 | } | |
4c49a5f0 SAS |
1368 | } |
1369 | ||
f1bddbb3 KO |
1370 | if (!driver->match_existing_only) { |
1371 | list_add_tail(&driver->pending, &gadget_driver_pending_list); | |
1372 | pr_info("udc-core: couldn't find an available UDC - added [%s] to list of pending drivers\n", | |
1373 | driver->function); | |
1374 | ret = 0; | |
1375 | } | |
1376 | ||
4c49a5f0 | 1377 | mutex_unlock(&udc_lock); |
f1bddbb3 | 1378 | return ret; |
4c49a5f0 SAS |
1379 | found: |
1380 | ret = udc_bind_to_driver(udc, driver); | |
2ccea03a FB |
1381 | mutex_unlock(&udc_lock); |
1382 | return ret; | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(usb_gadget_probe_driver); | |
1385 | ||
1386 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
1387 | { | |
1388 | struct usb_udc *udc = NULL; | |
1389 | int ret = -ENODEV; | |
1390 | ||
1391 | if (!driver || !driver->unbind) | |
1392 | return -EINVAL; | |
1393 | ||
1394 | mutex_lock(&udc_lock); | |
8236800d | 1395 | list_for_each_entry(udc, &udc_list, list) { |
2ccea03a FB |
1396 | if (udc->driver == driver) { |
1397 | usb_gadget_remove_driver(udc); | |
b5fb8d0a | 1398 | usb_gadget_set_state(udc->gadget, |
8236800d KO |
1399 | USB_STATE_NOTATTACHED); |
1400 | ||
1401 | /* Maybe there is someone waiting for this UDC? */ | |
1402 | check_pending_gadget_drivers(udc); | |
1403 | /* | |
1404 | * For now we ignore bind errors as probably it's | |
1405 | * not a valid reason to fail other's gadget unbind | |
1406 | */ | |
2ccea03a FB |
1407 | ret = 0; |
1408 | break; | |
1409 | } | |
8236800d | 1410 | } |
2ccea03a | 1411 | |
855ed04a RB |
1412 | if (ret) { |
1413 | list_del(&driver->pending); | |
1414 | ret = 0; | |
1415 | } | |
2ccea03a FB |
1416 | mutex_unlock(&udc_lock); |
1417 | return ret; | |
1418 | } | |
1419 | EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver); | |
1420 | ||
1421 | /* ------------------------------------------------------------------------- */ | |
1422 | ||
1423 | static ssize_t usb_udc_srp_store(struct device *dev, | |
1424 | struct device_attribute *attr, const char *buf, size_t n) | |
1425 | { | |
1d91a962 | 1426 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
1427 | |
1428 | if (sysfs_streq(buf, "1")) | |
1429 | usb_gadget_wakeup(udc->gadget); | |
1430 | ||
1431 | return n; | |
1432 | } | |
1433 | static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store); | |
1434 | ||
1435 | static ssize_t usb_udc_softconn_store(struct device *dev, | |
1436 | struct device_attribute *attr, const char *buf, size_t n) | |
1437 | { | |
865569ba | 1438 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a | 1439 | |
bfa6b18c FB |
1440 | if (!udc->driver) { |
1441 | dev_err(dev, "soft-connect without a gadget driver\n"); | |
1442 | return -EOPNOTSUPP; | |
1443 | } | |
1444 | ||
2ccea03a | 1445 | if (sysfs_streq(buf, "connect")) { |
2c683347 | 1446 | usb_gadget_udc_start(udc); |
2ccea03a FB |
1447 | usb_gadget_connect(udc->gadget); |
1448 | } else if (sysfs_streq(buf, "disconnect")) { | |
83a787a7 | 1449 | usb_gadget_disconnect(udc->gadget); |
0abd0696 | 1450 | udc->driver->disconnect(udc->gadget); |
2c683347 | 1451 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
1452 | } else { |
1453 | dev_err(dev, "unsupported command '%s'\n", buf); | |
1454 | return -EINVAL; | |
1455 | } | |
1456 | ||
1457 | return n; | |
1458 | } | |
1459 | static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store); | |
1460 | ||
ce26bd23 GKH |
1461 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
1462 | char *buf) | |
49401f41 FB |
1463 | { |
1464 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
1465 | struct usb_gadget *gadget = udc->gadget; | |
1466 | ||
1467 | return sprintf(buf, "%s\n", usb_state_string(gadget->state)); | |
1468 | } | |
ce26bd23 | 1469 | static DEVICE_ATTR_RO(state); |
49401f41 | 1470 | |
10416568 FB |
1471 | static ssize_t function_show(struct device *dev, struct device_attribute *attr, |
1472 | char *buf) | |
1473 | { | |
1474 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
1475 | struct usb_gadget_driver *drv = udc->driver; | |
1476 | ||
1477 | if (!drv || !drv->function) | |
1478 | return 0; | |
1479 | return scnprintf(buf, PAGE_SIZE, "%s\n", drv->function); | |
1480 | } | |
1481 | static DEVICE_ATTR_RO(function); | |
1482 | ||
d327ab5b | 1483 | #define USB_UDC_SPEED_ATTR(name, param) \ |
ce26bd23 | 1484 | ssize_t name##_show(struct device *dev, \ |
d327ab5b MN |
1485 | struct device_attribute *attr, char *buf) \ |
1486 | { \ | |
1487 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ | |
1488 | return snprintf(buf, PAGE_SIZE, "%s\n", \ | |
1489 | usb_speed_string(udc->gadget->param)); \ | |
1490 | } \ | |
ce26bd23 | 1491 | static DEVICE_ATTR_RO(name) |
d327ab5b MN |
1492 | |
1493 | static USB_UDC_SPEED_ATTR(current_speed, speed); | |
1494 | static USB_UDC_SPEED_ATTR(maximum_speed, max_speed); | |
1495 | ||
2ccea03a | 1496 | #define USB_UDC_ATTR(name) \ |
ce26bd23 | 1497 | ssize_t name##_show(struct device *dev, \ |
2ccea03a FB |
1498 | struct device_attribute *attr, char *buf) \ |
1499 | { \ | |
019f976e | 1500 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ |
2ccea03a FB |
1501 | struct usb_gadget *gadget = udc->gadget; \ |
1502 | \ | |
1503 | return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \ | |
1504 | } \ | |
ce26bd23 | 1505 | static DEVICE_ATTR_RO(name) |
2ccea03a | 1506 | |
2ccea03a FB |
1507 | static USB_UDC_ATTR(is_otg); |
1508 | static USB_UDC_ATTR(is_a_peripheral); | |
1509 | static USB_UDC_ATTR(b_hnp_enable); | |
1510 | static USB_UDC_ATTR(a_hnp_support); | |
1511 | static USB_UDC_ATTR(a_alt_hnp_support); | |
3f6dd4fe | 1512 | static USB_UDC_ATTR(is_selfpowered); |
2ccea03a FB |
1513 | |
1514 | static struct attribute *usb_udc_attrs[] = { | |
1515 | &dev_attr_srp.attr, | |
1516 | &dev_attr_soft_connect.attr, | |
49401f41 | 1517 | &dev_attr_state.attr, |
10416568 | 1518 | &dev_attr_function.attr, |
d327ab5b MN |
1519 | &dev_attr_current_speed.attr, |
1520 | &dev_attr_maximum_speed.attr, | |
2ccea03a | 1521 | |
2ccea03a FB |
1522 | &dev_attr_is_otg.attr, |
1523 | &dev_attr_is_a_peripheral.attr, | |
1524 | &dev_attr_b_hnp_enable.attr, | |
1525 | &dev_attr_a_hnp_support.attr, | |
1526 | &dev_attr_a_alt_hnp_support.attr, | |
3f6dd4fe | 1527 | &dev_attr_is_selfpowered.attr, |
2ccea03a FB |
1528 | NULL, |
1529 | }; | |
1530 | ||
1531 | static const struct attribute_group usb_udc_attr_group = { | |
1532 | .attrs = usb_udc_attrs, | |
1533 | }; | |
1534 | ||
1535 | static const struct attribute_group *usb_udc_attr_groups[] = { | |
1536 | &usb_udc_attr_group, | |
1537 | NULL, | |
1538 | }; | |
1539 | ||
1540 | static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1541 | { | |
1542 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
1543 | int ret; | |
1544 | ||
1545 | ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name); | |
1546 | if (ret) { | |
1547 | dev_err(dev, "failed to add uevent USB_UDC_NAME\n"); | |
1548 | return ret; | |
1549 | } | |
1550 | ||
1551 | if (udc->driver) { | |
1552 | ret = add_uevent_var(env, "USB_UDC_DRIVER=%s", | |
1553 | udc->driver->function); | |
1554 | if (ret) { | |
1555 | dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n"); | |
1556 | return ret; | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | static int __init usb_udc_init(void) | |
1564 | { | |
1565 | udc_class = class_create(THIS_MODULE, "udc"); | |
1566 | if (IS_ERR(udc_class)) { | |
1567 | pr_err("failed to create udc class --> %ld\n", | |
1568 | PTR_ERR(udc_class)); | |
1569 | return PTR_ERR(udc_class); | |
1570 | } | |
1571 | ||
1572 | udc_class->dev_uevent = usb_udc_uevent; | |
2ccea03a FB |
1573 | return 0; |
1574 | } | |
1575 | subsys_initcall(usb_udc_init); | |
1576 | ||
1577 | static void __exit usb_udc_exit(void) | |
1578 | { | |
1579 | class_destroy(udc_class); | |
1580 | } | |
1581 | module_exit(usb_udc_exit); | |
1582 | ||
1583 | MODULE_DESCRIPTION("UDC Framework"); | |
1584 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); | |
1585 | MODULE_LICENSE("GPL v2"); |