Commit | Line | Data |
---|---|---|
2ccea03a FB |
1 | /** |
2 | * udc.c - Core UDC Framework | |
3 | * | |
4 | * Copyright (C) 2010 Texas Instruments | |
5 | * Author: Felipe Balbi <balbi@ti.com> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 of | |
9 | * the License as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/err.h> | |
a698908d | 25 | #include <linux/dma-mapping.h> |
5702f753 | 26 | #include <linux/workqueue.h> |
2ccea03a FB |
27 | |
28 | #include <linux/usb/ch9.h> | |
29 | #include <linux/usb/gadget.h> | |
0cfbd328 | 30 | #include <linux/usb.h> |
2ccea03a FB |
31 | |
32 | /** | |
33 | * struct usb_udc - describes one usb device controller | |
34 | * @driver - the gadget driver pointer. For use by the class code | |
35 | * @dev - the child device to the actual controller | |
36 | * @gadget - the gadget. For use by the class code | |
37 | * @list - for use by the udc class driver | |
628ef0d2 PC |
38 | * @vbus - for udcs who care about vbus status, this value is real vbus status; |
39 | * for udcs who do not care about vbus status, this value is always true | |
2ccea03a FB |
40 | * |
41 | * This represents the internal data structure which is used by the UDC-class | |
42 | * to hold information about udc driver and gadget together. | |
43 | */ | |
44 | struct usb_udc { | |
45 | struct usb_gadget_driver *driver; | |
46 | struct usb_gadget *gadget; | |
47 | struct device dev; | |
48 | struct list_head list; | |
628ef0d2 | 49 | bool vbus; |
2ccea03a FB |
50 | }; |
51 | ||
52 | static struct class *udc_class; | |
2ccea03a FB |
53 | static LIST_HEAD(udc_list); |
54 | static DEFINE_MUTEX(udc_lock); | |
55 | ||
56 | /* ------------------------------------------------------------------------- */ | |
57 | ||
908b9613 AS |
58 | #ifdef CONFIG_HAS_DMA |
59 | ||
a698908d FB |
60 | int usb_gadget_map_request(struct usb_gadget *gadget, |
61 | struct usb_request *req, int is_in) | |
62 | { | |
7ace8fc8 YS |
63 | struct device *dev = gadget->dev.parent; |
64 | ||
a698908d FB |
65 | if (req->length == 0) |
66 | return 0; | |
67 | ||
68 | if (req->num_sgs) { | |
69 | int mapped; | |
70 | ||
7ace8fc8 | 71 | mapped = dma_map_sg(dev, req->sg, req->num_sgs, |
a698908d FB |
72 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
73 | if (mapped == 0) { | |
74 | dev_err(&gadget->dev, "failed to map SGs\n"); | |
75 | return -EFAULT; | |
76 | } | |
77 | ||
78 | req->num_mapped_sgs = mapped; | |
79 | } else { | |
7ace8fc8 | 80 | req->dma = dma_map_single(dev, req->buf, req->length, |
a698908d FB |
81 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
82 | ||
7ace8fc8 YS |
83 | if (dma_mapping_error(dev, req->dma)) { |
84 | dev_err(dev, "failed to map buffer\n"); | |
a698908d FB |
85 | return -EFAULT; |
86 | } | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(usb_gadget_map_request); | |
92 | ||
93 | void usb_gadget_unmap_request(struct usb_gadget *gadget, | |
94 | struct usb_request *req, int is_in) | |
95 | { | |
96 | if (req->length == 0) | |
97 | return; | |
98 | ||
99 | if (req->num_mapped_sgs) { | |
7ace8fc8 | 100 | dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs, |
a698908d FB |
101 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
102 | ||
103 | req->num_mapped_sgs = 0; | |
104 | } else { | |
7ace8fc8 | 105 | dma_unmap_single(gadget->dev.parent, req->dma, req->length, |
a698908d FB |
106 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
107 | } | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); | |
110 | ||
908b9613 AS |
111 | #endif /* CONFIG_HAS_DMA */ |
112 | ||
a698908d FB |
113 | /* ------------------------------------------------------------------------- */ |
114 | ||
3fc2aa55 MS |
115 | /** |
116 | * usb_gadget_giveback_request - give the request back to the gadget layer | |
117 | * Context: in_interrupt() | |
118 | * | |
119 | * This is called by device controller drivers in order to return the | |
120 | * completed request back to the gadget layer. | |
121 | */ | |
122 | void usb_gadget_giveback_request(struct usb_ep *ep, | |
123 | struct usb_request *req) | |
124 | { | |
0cfbd328 MS |
125 | if (likely(req->status == 0)) |
126 | usb_led_activity(USB_LED_EVENT_GADGET); | |
127 | ||
3fc2aa55 MS |
128 | req->complete(ep, req); |
129 | } | |
130 | EXPORT_SYMBOL_GPL(usb_gadget_giveback_request); | |
131 | ||
132 | /* ------------------------------------------------------------------------- */ | |
133 | ||
b0aea003 RB |
134 | /** |
135 | * gadget_find_ep_by_name - returns ep whose name is the same as sting passed | |
136 | * in second parameter or NULL if searched endpoint not found | |
137 | * @g: controller to check for quirk | |
138 | * @name: name of searched endpoint | |
139 | */ | |
140 | struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name) | |
141 | { | |
142 | struct usb_ep *ep; | |
143 | ||
144 | gadget_for_each_ep(ep, g) { | |
145 | if (!strcmp(ep->name, name)) | |
146 | return ep; | |
147 | } | |
148 | ||
149 | return NULL; | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(gadget_find_ep_by_name); | |
152 | ||
153 | /* ------------------------------------------------------------------------- */ | |
154 | ||
4278c687 RB |
155 | int usb_gadget_ep_match_desc(struct usb_gadget *gadget, |
156 | struct usb_ep *ep, struct usb_endpoint_descriptor *desc, | |
157 | struct usb_ss_ep_comp_descriptor *ep_comp) | |
158 | { | |
159 | u8 type; | |
160 | u16 max; | |
161 | int num_req_streams = 0; | |
162 | ||
163 | /* endpoint already claimed? */ | |
164 | if (ep->claimed) | |
165 | return 0; | |
166 | ||
167 | type = usb_endpoint_type(desc); | |
168 | max = 0x7ff & usb_endpoint_maxp(desc); | |
169 | ||
170 | if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in) | |
171 | return 0; | |
172 | if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out) | |
173 | return 0; | |
174 | ||
175 | if (max > ep->maxpacket_limit) | |
176 | return 0; | |
177 | ||
178 | /* "high bandwidth" works only at high speed */ | |
179 | if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11)) | |
180 | return 0; | |
181 | ||
182 | switch (type) { | |
183 | case USB_ENDPOINT_XFER_CONTROL: | |
184 | /* only support ep0 for portable CONTROL traffic */ | |
185 | return 0; | |
186 | case USB_ENDPOINT_XFER_ISOC: | |
187 | if (!ep->caps.type_iso) | |
188 | return 0; | |
189 | /* ISO: limit 1023 bytes full speed, 1024 high/super speed */ | |
190 | if (!gadget_is_dualspeed(gadget) && max > 1023) | |
191 | return 0; | |
192 | break; | |
193 | case USB_ENDPOINT_XFER_BULK: | |
194 | if (!ep->caps.type_bulk) | |
195 | return 0; | |
196 | if (ep_comp && gadget_is_superspeed(gadget)) { | |
197 | /* Get the number of required streams from the | |
198 | * EP companion descriptor and see if the EP | |
199 | * matches it | |
200 | */ | |
201 | num_req_streams = ep_comp->bmAttributes & 0x1f; | |
202 | if (num_req_streams > ep->max_streams) | |
203 | return 0; | |
204 | } | |
205 | break; | |
206 | case USB_ENDPOINT_XFER_INT: | |
207 | /* Bulk endpoints handle interrupt transfers, | |
208 | * except the toggle-quirky iso-synch kind | |
209 | */ | |
210 | if (!ep->caps.type_int && !ep->caps.type_bulk) | |
211 | return 0; | |
212 | /* INT: limit 64 bytes full speed, 1024 high/super speed */ | |
213 | if (!gadget_is_dualspeed(gadget) && max > 64) | |
214 | return 0; | |
215 | break; | |
216 | } | |
217 | ||
218 | return 1; | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); | |
221 | ||
222 | /* ------------------------------------------------------------------------- */ | |
223 | ||
5702f753 FB |
224 | static void usb_gadget_state_work(struct work_struct *work) |
225 | { | |
dfea9c94 PC |
226 | struct usb_gadget *gadget = work_to_gadget(work); |
227 | struct usb_udc *udc = gadget->udc; | |
5702f753 | 228 | |
dfea9c94 PC |
229 | if (udc) |
230 | sysfs_notify(&udc->dev.kobj, NULL, "state"); | |
5702f753 FB |
231 | } |
232 | ||
49401f41 FB |
233 | void usb_gadget_set_state(struct usb_gadget *gadget, |
234 | enum usb_device_state state) | |
235 | { | |
236 | gadget->state = state; | |
5702f753 | 237 | schedule_work(&gadget->work); |
49401f41 FB |
238 | } |
239 | EXPORT_SYMBOL_GPL(usb_gadget_set_state); | |
240 | ||
241 | /* ------------------------------------------------------------------------- */ | |
242 | ||
628ef0d2 PC |
243 | static void usb_udc_connect_control(struct usb_udc *udc) |
244 | { | |
245 | if (udc->vbus) | |
246 | usb_gadget_connect(udc->gadget); | |
247 | else | |
248 | usb_gadget_disconnect(udc->gadget); | |
249 | } | |
250 | ||
251 | /** | |
252 | * usb_udc_vbus_handler - updates the udc core vbus status, and try to | |
253 | * connect or disconnect gadget | |
254 | * @gadget: The gadget which vbus change occurs | |
255 | * @status: The vbus status | |
256 | * | |
257 | * The udc driver calls it when it wants to connect or disconnect gadget | |
258 | * according to vbus status. | |
259 | */ | |
260 | void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) | |
261 | { | |
262 | struct usb_udc *udc = gadget->udc; | |
263 | ||
264 | if (udc) { | |
265 | udc->vbus = status; | |
266 | usb_udc_connect_control(udc); | |
267 | } | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); | |
270 | ||
974a70bd PC |
271 | /** |
272 | * usb_gadget_udc_reset - notifies the udc core that bus reset occurs | |
273 | * @gadget: The gadget which bus reset occurs | |
274 | * @driver: The gadget driver we want to notify | |
275 | * | |
276 | * If the udc driver has bus reset handler, it needs to call this when the bus | |
277 | * reset occurs, it notifies the gadget driver that the bus reset occurs as | |
278 | * well as updates gadget state. | |
279 | */ | |
280 | void usb_gadget_udc_reset(struct usb_gadget *gadget, | |
281 | struct usb_gadget_driver *driver) | |
282 | { | |
283 | driver->reset(gadget); | |
284 | usb_gadget_set_state(gadget, USB_STATE_DEFAULT); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(usb_gadget_udc_reset); | |
287 | ||
352c2dc8 SAS |
288 | /** |
289 | * usb_gadget_udc_start - tells usb device controller to start up | |
2c683347 | 290 | * @udc: The UDC to be started |
352c2dc8 SAS |
291 | * |
292 | * This call is issued by the UDC Class driver when it's about | |
293 | * to register a gadget driver to the device controller, before | |
294 | * calling gadget driver's bind() method. | |
295 | * | |
296 | * It allows the controller to be powered off until strictly | |
297 | * necessary to have it powered on. | |
298 | * | |
299 | * Returns zero on success, else negative errno. | |
300 | */ | |
2c683347 | 301 | static inline int usb_gadget_udc_start(struct usb_udc *udc) |
352c2dc8 | 302 | { |
2c683347 | 303 | return udc->gadget->ops->udc_start(udc->gadget, udc->driver); |
352c2dc8 SAS |
304 | } |
305 | ||
352c2dc8 SAS |
306 | /** |
307 | * usb_gadget_udc_stop - tells usb device controller we don't need it anymore | |
308 | * @gadget: The device we want to stop activity | |
309 | * @driver: The driver to unbind from @gadget | |
310 | * | |
311 | * This call is issued by the UDC Class driver after calling | |
312 | * gadget driver's unbind() method. | |
313 | * | |
314 | * The details are implementation specific, but it can go as | |
315 | * far as powering off UDC completely and disable its data | |
316 | * line pullups. | |
317 | */ | |
2c683347 | 318 | static inline void usb_gadget_udc_stop(struct usb_udc *udc) |
352c2dc8 | 319 | { |
22835b80 | 320 | udc->gadget->ops->udc_stop(udc->gadget); |
352c2dc8 SAS |
321 | } |
322 | ||
2ccea03a FB |
323 | /** |
324 | * usb_udc_release - release the usb_udc struct | |
325 | * @dev: the dev member within usb_udc | |
326 | * | |
327 | * This is called by driver's core in order to free memory once the last | |
328 | * reference is released. | |
329 | */ | |
330 | static void usb_udc_release(struct device *dev) | |
331 | { | |
332 | struct usb_udc *udc; | |
333 | ||
334 | udc = container_of(dev, struct usb_udc, dev); | |
335 | dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); | |
336 | kfree(udc); | |
337 | } | |
338 | ||
019f976e | 339 | static const struct attribute_group *usb_udc_attr_groups[]; |
792bfcf7 FB |
340 | |
341 | static void usb_udc_nop_release(struct device *dev) | |
342 | { | |
343 | dev_vdbg(dev, "%s\n", __func__); | |
344 | } | |
345 | ||
2ccea03a | 346 | /** |
792bfcf7 FB |
347 | * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list |
348 | * @parent: the parent device to this udc. Usually the controller driver's | |
349 | * device. | |
350 | * @gadget: the gadget to be added to the list. | |
351 | * @release: a gadget release function. | |
2ccea03a FB |
352 | * |
353 | * Returns zero on success, negative errno otherwise. | |
354 | */ | |
792bfcf7 FB |
355 | int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, |
356 | void (*release)(struct device *dev)) | |
2ccea03a FB |
357 | { |
358 | struct usb_udc *udc; | |
359 | int ret = -ENOMEM; | |
360 | ||
361 | udc = kzalloc(sizeof(*udc), GFP_KERNEL); | |
362 | if (!udc) | |
363 | goto err1; | |
364 | ||
7bce401c | 365 | dev_set_name(&gadget->dev, "gadget"); |
5702f753 | 366 | INIT_WORK(&gadget->work, usb_gadget_state_work); |
2ed14320 | 367 | gadget->dev.parent = parent; |
f07bd56b | 368 | |
908b9613 | 369 | #ifdef CONFIG_HAS_DMA |
658c8cf1 FB |
370 | dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask); |
371 | gadget->dev.dma_parms = parent->dma_parms; | |
372 | gadget->dev.dma_mask = parent->dma_mask; | |
908b9613 | 373 | #endif |
658c8cf1 | 374 | |
ddf47ccb | 375 | if (release) |
792bfcf7 | 376 | gadget->dev.release = release; |
ddf47ccb FB |
377 | else |
378 | gadget->dev.release = usb_udc_nop_release; | |
792bfcf7 | 379 | |
7bce401c FB |
380 | ret = device_register(&gadget->dev); |
381 | if (ret) | |
382 | goto err2; | |
f07bd56b | 383 | |
2ccea03a FB |
384 | device_initialize(&udc->dev); |
385 | udc->dev.release = usb_udc_release; | |
386 | udc->dev.class = udc_class; | |
019f976e | 387 | udc->dev.groups = usb_udc_attr_groups; |
2ccea03a FB |
388 | udc->dev.parent = parent; |
389 | ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); | |
390 | if (ret) | |
f07bd56b | 391 | goto err3; |
2ccea03a FB |
392 | |
393 | udc->gadget = gadget; | |
dfea9c94 | 394 | gadget->udc = udc; |
2ccea03a FB |
395 | |
396 | mutex_lock(&udc_lock); | |
397 | list_add_tail(&udc->list, &udc_list); | |
398 | ||
399 | ret = device_add(&udc->dev); | |
400 | if (ret) | |
f07bd56b | 401 | goto err4; |
2ccea03a | 402 | |
49401f41 | 403 | usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); |
628ef0d2 | 404 | udc->vbus = true; |
2ccea03a FB |
405 | |
406 | mutex_unlock(&udc_lock); | |
407 | ||
408 | return 0; | |
f07bd56b FB |
409 | |
410 | err4: | |
2ccea03a FB |
411 | list_del(&udc->list); |
412 | mutex_unlock(&udc_lock); | |
413 | ||
f07bd56b | 414 | err3: |
2ccea03a | 415 | put_device(&udc->dev); |
c93e64e9 | 416 | device_del(&gadget->dev); |
2ccea03a | 417 | |
f07bd56b | 418 | err2: |
7bce401c | 419 | put_device(&gadget->dev); |
c5dbc220 | 420 | kfree(udc); |
7bce401c | 421 | |
2ccea03a FB |
422 | err1: |
423 | return ret; | |
424 | } | |
792bfcf7 FB |
425 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); |
426 | ||
427 | /** | |
428 | * usb_add_gadget_udc - adds a new gadget to the udc class driver list | |
429 | * @parent: the parent device to this udc. Usually the controller | |
430 | * driver's device. | |
431 | * @gadget: the gadget to be added to the list | |
432 | * | |
433 | * Returns zero on success, negative errno otherwise. | |
434 | */ | |
435 | int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget) | |
436 | { | |
437 | return usb_add_gadget_udc_release(parent, gadget, NULL); | |
438 | } | |
2ccea03a FB |
439 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc); |
440 | ||
441 | static void usb_gadget_remove_driver(struct usb_udc *udc) | |
442 | { | |
443 | dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", | |
8da9fe8a | 444 | udc->driver->function); |
2ccea03a FB |
445 | |
446 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
447 | ||
2d7ebbb0 FB |
448 | usb_gadget_disconnect(udc->gadget); |
449 | udc->driver->disconnect(udc->gadget); | |
450 | udc->driver->unbind(udc->gadget); | |
2c683347 | 451 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
452 | |
453 | udc->driver = NULL; | |
454 | udc->dev.driver = NULL; | |
70d3a498 | 455 | udc->gadget->dev.driver = NULL; |
2ccea03a FB |
456 | } |
457 | ||
458 | /** | |
459 | * usb_del_gadget_udc - deletes @udc from udc_list | |
460 | * @gadget: the gadget to be removed. | |
461 | * | |
462 | * This, will call usb_gadget_unregister_driver() if | |
463 | * the @udc is still busy. | |
464 | */ | |
465 | void usb_del_gadget_udc(struct usb_gadget *gadget) | |
466 | { | |
dfea9c94 | 467 | struct usb_udc *udc = gadget->udc; |
2ccea03a | 468 | |
dfea9c94 PC |
469 | if (!udc) |
470 | return; | |
2ccea03a | 471 | |
2ccea03a FB |
472 | dev_vdbg(gadget->dev.parent, "unregistering gadget\n"); |
473 | ||
dfea9c94 | 474 | mutex_lock(&udc_lock); |
2ccea03a FB |
475 | list_del(&udc->list); |
476 | mutex_unlock(&udc_lock); | |
477 | ||
478 | if (udc->driver) | |
479 | usb_gadget_remove_driver(udc); | |
480 | ||
481 | kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); | |
5702f753 | 482 | flush_work(&gadget->work); |
2ccea03a | 483 | device_unregister(&udc->dev); |
7bce401c | 484 | device_unregister(&gadget->dev); |
2ccea03a FB |
485 | } |
486 | EXPORT_SYMBOL_GPL(usb_del_gadget_udc); | |
487 | ||
488 | /* ------------------------------------------------------------------------- */ | |
489 | ||
4c49a5f0 | 490 | static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) |
2ccea03a | 491 | { |
4c49a5f0 | 492 | int ret; |
2ccea03a | 493 | |
2ccea03a FB |
494 | dev_dbg(&udc->dev, "registering UDC driver [%s]\n", |
495 | driver->function); | |
496 | ||
497 | udc->driver = driver; | |
498 | udc->dev.driver = &driver->driver; | |
70d3a498 | 499 | udc->gadget->dev.driver = &driver->driver; |
2ccea03a | 500 | |
2d7ebbb0 FB |
501 | ret = driver->bind(udc->gadget, driver); |
502 | if (ret) | |
503 | goto err1; | |
2c683347 | 504 | ret = usb_gadget_udc_start(udc); |
2d7ebbb0 FB |
505 | if (ret) { |
506 | driver->unbind(udc->gadget); | |
507 | goto err1; | |
352c2dc8 | 508 | } |
628ef0d2 | 509 | usb_udc_connect_control(udc); |
2ccea03a FB |
510 | |
511 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
2ccea03a | 512 | return 0; |
2ccea03a | 513 | err1: |
f8cffc84 FE |
514 | if (ret != -EISNAM) |
515 | dev_err(&udc->dev, "failed to start %s: %d\n", | |
2ccea03a FB |
516 | udc->driver->function, ret); |
517 | udc->driver = NULL; | |
518 | udc->dev.driver = NULL; | |
70d3a498 | 519 | udc->gadget->dev.driver = NULL; |
4c49a5f0 SAS |
520 | return ret; |
521 | } | |
522 | ||
02e8c966 | 523 | int usb_udc_attach_driver(const char *name, struct usb_gadget_driver *driver) |
4c49a5f0 SAS |
524 | { |
525 | struct usb_udc *udc = NULL; | |
526 | int ret = -ENODEV; | |
527 | ||
528 | mutex_lock(&udc_lock); | |
529 | list_for_each_entry(udc, &udc_list, list) { | |
530 | ret = strcmp(name, dev_name(&udc->dev)); | |
531 | if (!ret) | |
532 | break; | |
533 | } | |
534 | if (ret) { | |
535 | ret = -ENODEV; | |
536 | goto out; | |
537 | } | |
538 | if (udc->driver) { | |
539 | ret = -EBUSY; | |
540 | goto out; | |
541 | } | |
542 | ret = udc_bind_to_driver(udc, driver); | |
543 | out: | |
544 | mutex_unlock(&udc_lock); | |
545 | return ret; | |
546 | } | |
02e8c966 | 547 | EXPORT_SYMBOL_GPL(usb_udc_attach_driver); |
4c49a5f0 SAS |
548 | |
549 | int usb_gadget_probe_driver(struct usb_gadget_driver *driver) | |
550 | { | |
551 | struct usb_udc *udc = NULL; | |
552 | int ret; | |
553 | ||
554 | if (!driver || !driver->bind || !driver->setup) | |
555 | return -EINVAL; | |
556 | ||
557 | mutex_lock(&udc_lock); | |
558 | list_for_each_entry(udc, &udc_list, list) { | |
559 | /* For now we take the first one */ | |
560 | if (!udc->driver) | |
561 | goto found; | |
562 | } | |
563 | ||
564 | pr_debug("couldn't find an available UDC\n"); | |
565 | mutex_unlock(&udc_lock); | |
566 | return -ENODEV; | |
567 | found: | |
568 | ret = udc_bind_to_driver(udc, driver); | |
2ccea03a FB |
569 | mutex_unlock(&udc_lock); |
570 | return ret; | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(usb_gadget_probe_driver); | |
573 | ||
574 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
575 | { | |
576 | struct usb_udc *udc = NULL; | |
577 | int ret = -ENODEV; | |
578 | ||
579 | if (!driver || !driver->unbind) | |
580 | return -EINVAL; | |
581 | ||
582 | mutex_lock(&udc_lock); | |
583 | list_for_each_entry(udc, &udc_list, list) | |
584 | if (udc->driver == driver) { | |
585 | usb_gadget_remove_driver(udc); | |
b5fb8d0a PC |
586 | usb_gadget_set_state(udc->gadget, |
587 | USB_STATE_NOTATTACHED); | |
2ccea03a FB |
588 | ret = 0; |
589 | break; | |
590 | } | |
591 | ||
592 | mutex_unlock(&udc_lock); | |
593 | return ret; | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver); | |
596 | ||
597 | /* ------------------------------------------------------------------------- */ | |
598 | ||
599 | static ssize_t usb_udc_srp_store(struct device *dev, | |
600 | struct device_attribute *attr, const char *buf, size_t n) | |
601 | { | |
1d91a962 | 602 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
603 | |
604 | if (sysfs_streq(buf, "1")) | |
605 | usb_gadget_wakeup(udc->gadget); | |
606 | ||
607 | return n; | |
608 | } | |
609 | static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store); | |
610 | ||
611 | static ssize_t usb_udc_softconn_store(struct device *dev, | |
612 | struct device_attribute *attr, const char *buf, size_t n) | |
613 | { | |
865569ba | 614 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a | 615 | |
bfa6b18c FB |
616 | if (!udc->driver) { |
617 | dev_err(dev, "soft-connect without a gadget driver\n"); | |
618 | return -EOPNOTSUPP; | |
619 | } | |
620 | ||
2ccea03a | 621 | if (sysfs_streq(buf, "connect")) { |
2c683347 | 622 | usb_gadget_udc_start(udc); |
2ccea03a FB |
623 | usb_gadget_connect(udc->gadget); |
624 | } else if (sysfs_streq(buf, "disconnect")) { | |
83a787a7 | 625 | usb_gadget_disconnect(udc->gadget); |
0abd0696 | 626 | udc->driver->disconnect(udc->gadget); |
2c683347 | 627 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
628 | } else { |
629 | dev_err(dev, "unsupported command '%s'\n", buf); | |
630 | return -EINVAL; | |
631 | } | |
632 | ||
633 | return n; | |
634 | } | |
635 | static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store); | |
636 | ||
ce26bd23 GKH |
637 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
638 | char *buf) | |
49401f41 FB |
639 | { |
640 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
641 | struct usb_gadget *gadget = udc->gadget; | |
642 | ||
643 | return sprintf(buf, "%s\n", usb_state_string(gadget->state)); | |
644 | } | |
ce26bd23 | 645 | static DEVICE_ATTR_RO(state); |
49401f41 | 646 | |
d327ab5b | 647 | #define USB_UDC_SPEED_ATTR(name, param) \ |
ce26bd23 | 648 | ssize_t name##_show(struct device *dev, \ |
d327ab5b MN |
649 | struct device_attribute *attr, char *buf) \ |
650 | { \ | |
651 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ | |
652 | return snprintf(buf, PAGE_SIZE, "%s\n", \ | |
653 | usb_speed_string(udc->gadget->param)); \ | |
654 | } \ | |
ce26bd23 | 655 | static DEVICE_ATTR_RO(name) |
d327ab5b MN |
656 | |
657 | static USB_UDC_SPEED_ATTR(current_speed, speed); | |
658 | static USB_UDC_SPEED_ATTR(maximum_speed, max_speed); | |
659 | ||
2ccea03a | 660 | #define USB_UDC_ATTR(name) \ |
ce26bd23 | 661 | ssize_t name##_show(struct device *dev, \ |
2ccea03a FB |
662 | struct device_attribute *attr, char *buf) \ |
663 | { \ | |
019f976e | 664 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ |
2ccea03a FB |
665 | struct usb_gadget *gadget = udc->gadget; \ |
666 | \ | |
667 | return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \ | |
668 | } \ | |
ce26bd23 | 669 | static DEVICE_ATTR_RO(name) |
2ccea03a | 670 | |
2ccea03a FB |
671 | static USB_UDC_ATTR(is_otg); |
672 | static USB_UDC_ATTR(is_a_peripheral); | |
673 | static USB_UDC_ATTR(b_hnp_enable); | |
674 | static USB_UDC_ATTR(a_hnp_support); | |
675 | static USB_UDC_ATTR(a_alt_hnp_support); | |
3f6dd4fe | 676 | static USB_UDC_ATTR(is_selfpowered); |
2ccea03a FB |
677 | |
678 | static struct attribute *usb_udc_attrs[] = { | |
679 | &dev_attr_srp.attr, | |
680 | &dev_attr_soft_connect.attr, | |
49401f41 | 681 | &dev_attr_state.attr, |
d327ab5b MN |
682 | &dev_attr_current_speed.attr, |
683 | &dev_attr_maximum_speed.attr, | |
2ccea03a | 684 | |
2ccea03a FB |
685 | &dev_attr_is_otg.attr, |
686 | &dev_attr_is_a_peripheral.attr, | |
687 | &dev_attr_b_hnp_enable.attr, | |
688 | &dev_attr_a_hnp_support.attr, | |
689 | &dev_attr_a_alt_hnp_support.attr, | |
3f6dd4fe | 690 | &dev_attr_is_selfpowered.attr, |
2ccea03a FB |
691 | NULL, |
692 | }; | |
693 | ||
694 | static const struct attribute_group usb_udc_attr_group = { | |
695 | .attrs = usb_udc_attrs, | |
696 | }; | |
697 | ||
698 | static const struct attribute_group *usb_udc_attr_groups[] = { | |
699 | &usb_udc_attr_group, | |
700 | NULL, | |
701 | }; | |
702 | ||
703 | static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) | |
704 | { | |
705 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
706 | int ret; | |
707 | ||
708 | ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name); | |
709 | if (ret) { | |
710 | dev_err(dev, "failed to add uevent USB_UDC_NAME\n"); | |
711 | return ret; | |
712 | } | |
713 | ||
714 | if (udc->driver) { | |
715 | ret = add_uevent_var(env, "USB_UDC_DRIVER=%s", | |
716 | udc->driver->function); | |
717 | if (ret) { | |
718 | dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n"); | |
719 | return ret; | |
720 | } | |
721 | } | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static int __init usb_udc_init(void) | |
727 | { | |
728 | udc_class = class_create(THIS_MODULE, "udc"); | |
729 | if (IS_ERR(udc_class)) { | |
730 | pr_err("failed to create udc class --> %ld\n", | |
731 | PTR_ERR(udc_class)); | |
732 | return PTR_ERR(udc_class); | |
733 | } | |
734 | ||
735 | udc_class->dev_uevent = usb_udc_uevent; | |
2ccea03a FB |
736 | return 0; |
737 | } | |
738 | subsys_initcall(usb_udc_init); | |
739 | ||
740 | static void __exit usb_udc_exit(void) | |
741 | { | |
742 | class_destroy(udc_class); | |
743 | } | |
744 | module_exit(usb_udc_exit); | |
745 | ||
746 | MODULE_DESCRIPTION("UDC Framework"); | |
747 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); | |
748 | MODULE_LICENSE("GPL v2"); |