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 | 53 | static LIST_HEAD(udc_list); |
855ed04a | 54 | static LIST_HEAD(gadget_driver_pending_list); |
2ccea03a FB |
55 | static DEFINE_MUTEX(udc_lock); |
56 | ||
855ed04a RB |
57 | static int udc_bind_to_driver(struct usb_udc *udc, |
58 | struct usb_gadget_driver *driver); | |
59 | ||
2ccea03a FB |
60 | /* ------------------------------------------------------------------------- */ |
61 | ||
908b9613 AS |
62 | #ifdef CONFIG_HAS_DMA |
63 | ||
a698908d FB |
64 | int usb_gadget_map_request(struct usb_gadget *gadget, |
65 | struct usb_request *req, int is_in) | |
66 | { | |
7ace8fc8 YS |
67 | struct device *dev = gadget->dev.parent; |
68 | ||
a698908d FB |
69 | if (req->length == 0) |
70 | return 0; | |
71 | ||
72 | if (req->num_sgs) { | |
73 | int mapped; | |
74 | ||
7ace8fc8 | 75 | mapped = dma_map_sg(dev, req->sg, req->num_sgs, |
a698908d FB |
76 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
77 | if (mapped == 0) { | |
78 | dev_err(&gadget->dev, "failed to map SGs\n"); | |
79 | return -EFAULT; | |
80 | } | |
81 | ||
82 | req->num_mapped_sgs = mapped; | |
83 | } else { | |
7ace8fc8 | 84 | req->dma = dma_map_single(dev, req->buf, req->length, |
a698908d FB |
85 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
86 | ||
7ace8fc8 YS |
87 | if (dma_mapping_error(dev, req->dma)) { |
88 | dev_err(dev, "failed to map buffer\n"); | |
a698908d FB |
89 | return -EFAULT; |
90 | } | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(usb_gadget_map_request); | |
96 | ||
97 | void usb_gadget_unmap_request(struct usb_gadget *gadget, | |
98 | struct usb_request *req, int is_in) | |
99 | { | |
100 | if (req->length == 0) | |
101 | return; | |
102 | ||
103 | if (req->num_mapped_sgs) { | |
7ace8fc8 | 104 | dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs, |
a698908d FB |
105 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
106 | ||
107 | req->num_mapped_sgs = 0; | |
108 | } else { | |
7ace8fc8 | 109 | dma_unmap_single(gadget->dev.parent, req->dma, req->length, |
a698908d FB |
110 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
111 | } | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); | |
114 | ||
908b9613 AS |
115 | #endif /* CONFIG_HAS_DMA */ |
116 | ||
a698908d FB |
117 | /* ------------------------------------------------------------------------- */ |
118 | ||
3fc2aa55 MS |
119 | /** |
120 | * usb_gadget_giveback_request - give the request back to the gadget layer | |
121 | * Context: in_interrupt() | |
122 | * | |
123 | * This is called by device controller drivers in order to return the | |
124 | * completed request back to the gadget layer. | |
125 | */ | |
126 | void usb_gadget_giveback_request(struct usb_ep *ep, | |
127 | struct usb_request *req) | |
128 | { | |
0cfbd328 MS |
129 | if (likely(req->status == 0)) |
130 | usb_led_activity(USB_LED_EVENT_GADGET); | |
131 | ||
3fc2aa55 MS |
132 | req->complete(ep, req); |
133 | } | |
134 | EXPORT_SYMBOL_GPL(usb_gadget_giveback_request); | |
135 | ||
136 | /* ------------------------------------------------------------------------- */ | |
137 | ||
b0aea003 RB |
138 | /** |
139 | * gadget_find_ep_by_name - returns ep whose name is the same as sting passed | |
140 | * in second parameter or NULL if searched endpoint not found | |
141 | * @g: controller to check for quirk | |
142 | * @name: name of searched endpoint | |
143 | */ | |
144 | struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name) | |
145 | { | |
146 | struct usb_ep *ep; | |
147 | ||
148 | gadget_for_each_ep(ep, g) { | |
149 | if (!strcmp(ep->name, name)) | |
150 | return ep; | |
151 | } | |
152 | ||
153 | return NULL; | |
154 | } | |
155 | EXPORT_SYMBOL_GPL(gadget_find_ep_by_name); | |
156 | ||
157 | /* ------------------------------------------------------------------------- */ | |
158 | ||
4278c687 RB |
159 | int usb_gadget_ep_match_desc(struct usb_gadget *gadget, |
160 | struct usb_ep *ep, struct usb_endpoint_descriptor *desc, | |
161 | struct usb_ss_ep_comp_descriptor *ep_comp) | |
162 | { | |
163 | u8 type; | |
164 | u16 max; | |
165 | int num_req_streams = 0; | |
166 | ||
167 | /* endpoint already claimed? */ | |
168 | if (ep->claimed) | |
169 | return 0; | |
170 | ||
171 | type = usb_endpoint_type(desc); | |
172 | max = 0x7ff & usb_endpoint_maxp(desc); | |
173 | ||
174 | if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in) | |
175 | return 0; | |
176 | if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out) | |
177 | return 0; | |
178 | ||
179 | if (max > ep->maxpacket_limit) | |
180 | return 0; | |
181 | ||
182 | /* "high bandwidth" works only at high speed */ | |
183 | if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11)) | |
184 | return 0; | |
185 | ||
186 | switch (type) { | |
187 | case USB_ENDPOINT_XFER_CONTROL: | |
188 | /* only support ep0 for portable CONTROL traffic */ | |
189 | return 0; | |
190 | case USB_ENDPOINT_XFER_ISOC: | |
191 | if (!ep->caps.type_iso) | |
192 | return 0; | |
193 | /* ISO: limit 1023 bytes full speed, 1024 high/super speed */ | |
194 | if (!gadget_is_dualspeed(gadget) && max > 1023) | |
195 | return 0; | |
196 | break; | |
197 | case USB_ENDPOINT_XFER_BULK: | |
198 | if (!ep->caps.type_bulk) | |
199 | return 0; | |
200 | if (ep_comp && gadget_is_superspeed(gadget)) { | |
201 | /* Get the number of required streams from the | |
202 | * EP companion descriptor and see if the EP | |
203 | * matches it | |
204 | */ | |
205 | num_req_streams = ep_comp->bmAttributes & 0x1f; | |
206 | if (num_req_streams > ep->max_streams) | |
207 | return 0; | |
208 | } | |
209 | break; | |
210 | case USB_ENDPOINT_XFER_INT: | |
211 | /* Bulk endpoints handle interrupt transfers, | |
212 | * except the toggle-quirky iso-synch kind | |
213 | */ | |
214 | if (!ep->caps.type_int && !ep->caps.type_bulk) | |
215 | return 0; | |
216 | /* INT: limit 64 bytes full speed, 1024 high/super speed */ | |
217 | if (!gadget_is_dualspeed(gadget) && max > 64) | |
218 | return 0; | |
219 | break; | |
220 | } | |
221 | ||
222 | return 1; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); | |
225 | ||
226 | /* ------------------------------------------------------------------------- */ | |
227 | ||
5702f753 FB |
228 | static void usb_gadget_state_work(struct work_struct *work) |
229 | { | |
dfea9c94 PC |
230 | struct usb_gadget *gadget = work_to_gadget(work); |
231 | struct usb_udc *udc = gadget->udc; | |
5702f753 | 232 | |
dfea9c94 PC |
233 | if (udc) |
234 | sysfs_notify(&udc->dev.kobj, NULL, "state"); | |
5702f753 FB |
235 | } |
236 | ||
49401f41 FB |
237 | void usb_gadget_set_state(struct usb_gadget *gadget, |
238 | enum usb_device_state state) | |
239 | { | |
240 | gadget->state = state; | |
5702f753 | 241 | schedule_work(&gadget->work); |
49401f41 FB |
242 | } |
243 | EXPORT_SYMBOL_GPL(usb_gadget_set_state); | |
244 | ||
245 | /* ------------------------------------------------------------------------- */ | |
246 | ||
628ef0d2 PC |
247 | static void usb_udc_connect_control(struct usb_udc *udc) |
248 | { | |
249 | if (udc->vbus) | |
250 | usb_gadget_connect(udc->gadget); | |
251 | else | |
252 | usb_gadget_disconnect(udc->gadget); | |
253 | } | |
254 | ||
255 | /** | |
256 | * usb_udc_vbus_handler - updates the udc core vbus status, and try to | |
257 | * connect or disconnect gadget | |
258 | * @gadget: The gadget which vbus change occurs | |
259 | * @status: The vbus status | |
260 | * | |
261 | * The udc driver calls it when it wants to connect or disconnect gadget | |
262 | * according to vbus status. | |
263 | */ | |
264 | void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) | |
265 | { | |
266 | struct usb_udc *udc = gadget->udc; | |
267 | ||
268 | if (udc) { | |
269 | udc->vbus = status; | |
270 | usb_udc_connect_control(udc); | |
271 | } | |
272 | } | |
273 | EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); | |
274 | ||
974a70bd PC |
275 | /** |
276 | * usb_gadget_udc_reset - notifies the udc core that bus reset occurs | |
277 | * @gadget: The gadget which bus reset occurs | |
278 | * @driver: The gadget driver we want to notify | |
279 | * | |
280 | * If the udc driver has bus reset handler, it needs to call this when the bus | |
281 | * reset occurs, it notifies the gadget driver that the bus reset occurs as | |
282 | * well as updates gadget state. | |
283 | */ | |
284 | void usb_gadget_udc_reset(struct usb_gadget *gadget, | |
285 | struct usb_gadget_driver *driver) | |
286 | { | |
287 | driver->reset(gadget); | |
288 | usb_gadget_set_state(gadget, USB_STATE_DEFAULT); | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(usb_gadget_udc_reset); | |
291 | ||
352c2dc8 SAS |
292 | /** |
293 | * usb_gadget_udc_start - tells usb device controller to start up | |
2c683347 | 294 | * @udc: The UDC to be started |
352c2dc8 SAS |
295 | * |
296 | * This call is issued by the UDC Class driver when it's about | |
297 | * to register a gadget driver to the device controller, before | |
298 | * calling gadget driver's bind() method. | |
299 | * | |
300 | * It allows the controller to be powered off until strictly | |
301 | * necessary to have it powered on. | |
302 | * | |
303 | * Returns zero on success, else negative errno. | |
304 | */ | |
2c683347 | 305 | static inline int usb_gadget_udc_start(struct usb_udc *udc) |
352c2dc8 | 306 | { |
2c683347 | 307 | return udc->gadget->ops->udc_start(udc->gadget, udc->driver); |
352c2dc8 SAS |
308 | } |
309 | ||
352c2dc8 SAS |
310 | /** |
311 | * usb_gadget_udc_stop - tells usb device controller we don't need it anymore | |
312 | * @gadget: The device we want to stop activity | |
313 | * @driver: The driver to unbind from @gadget | |
314 | * | |
315 | * This call is issued by the UDC Class driver after calling | |
316 | * gadget driver's unbind() method. | |
317 | * | |
318 | * The details are implementation specific, but it can go as | |
319 | * far as powering off UDC completely and disable its data | |
320 | * line pullups. | |
321 | */ | |
2c683347 | 322 | static inline void usb_gadget_udc_stop(struct usb_udc *udc) |
352c2dc8 | 323 | { |
22835b80 | 324 | udc->gadget->ops->udc_stop(udc->gadget); |
352c2dc8 SAS |
325 | } |
326 | ||
2ccea03a FB |
327 | /** |
328 | * usb_udc_release - release the usb_udc struct | |
329 | * @dev: the dev member within usb_udc | |
330 | * | |
331 | * This is called by driver's core in order to free memory once the last | |
332 | * reference is released. | |
333 | */ | |
334 | static void usb_udc_release(struct device *dev) | |
335 | { | |
336 | struct usb_udc *udc; | |
337 | ||
338 | udc = container_of(dev, struct usb_udc, dev); | |
339 | dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); | |
340 | kfree(udc); | |
341 | } | |
342 | ||
019f976e | 343 | static const struct attribute_group *usb_udc_attr_groups[]; |
792bfcf7 FB |
344 | |
345 | static void usb_udc_nop_release(struct device *dev) | |
346 | { | |
347 | dev_vdbg(dev, "%s\n", __func__); | |
348 | } | |
349 | ||
2ccea03a | 350 | /** |
792bfcf7 FB |
351 | * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list |
352 | * @parent: the parent device to this udc. Usually the controller driver's | |
353 | * device. | |
354 | * @gadget: the gadget to be added to the list. | |
355 | * @release: a gadget release function. | |
2ccea03a FB |
356 | * |
357 | * Returns zero on success, negative errno otherwise. | |
358 | */ | |
792bfcf7 FB |
359 | int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, |
360 | void (*release)(struct device *dev)) | |
2ccea03a FB |
361 | { |
362 | struct usb_udc *udc; | |
855ed04a | 363 | struct usb_gadget_driver *driver; |
2ccea03a FB |
364 | int ret = -ENOMEM; |
365 | ||
366 | udc = kzalloc(sizeof(*udc), GFP_KERNEL); | |
367 | if (!udc) | |
368 | goto err1; | |
369 | ||
7bce401c | 370 | dev_set_name(&gadget->dev, "gadget"); |
5702f753 | 371 | INIT_WORK(&gadget->work, usb_gadget_state_work); |
2ed14320 | 372 | gadget->dev.parent = parent; |
f07bd56b | 373 | |
908b9613 | 374 | #ifdef CONFIG_HAS_DMA |
658c8cf1 FB |
375 | dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask); |
376 | gadget->dev.dma_parms = parent->dma_parms; | |
377 | gadget->dev.dma_mask = parent->dma_mask; | |
908b9613 | 378 | #endif |
658c8cf1 | 379 | |
ddf47ccb | 380 | if (release) |
792bfcf7 | 381 | gadget->dev.release = release; |
ddf47ccb FB |
382 | else |
383 | gadget->dev.release = usb_udc_nop_release; | |
792bfcf7 | 384 | |
7bce401c FB |
385 | ret = device_register(&gadget->dev); |
386 | if (ret) | |
387 | goto err2; | |
f07bd56b | 388 | |
2ccea03a FB |
389 | device_initialize(&udc->dev); |
390 | udc->dev.release = usb_udc_release; | |
391 | udc->dev.class = udc_class; | |
019f976e | 392 | udc->dev.groups = usb_udc_attr_groups; |
2ccea03a FB |
393 | udc->dev.parent = parent; |
394 | ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); | |
395 | if (ret) | |
f07bd56b | 396 | goto err3; |
2ccea03a FB |
397 | |
398 | udc->gadget = gadget; | |
dfea9c94 | 399 | gadget->udc = udc; |
2ccea03a FB |
400 | |
401 | mutex_lock(&udc_lock); | |
402 | list_add_tail(&udc->list, &udc_list); | |
403 | ||
404 | ret = device_add(&udc->dev); | |
405 | if (ret) | |
f07bd56b | 406 | goto err4; |
2ccea03a | 407 | |
49401f41 | 408 | usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); |
628ef0d2 | 409 | udc->vbus = true; |
2ccea03a | 410 | |
855ed04a RB |
411 | /* pick up one of pending gadget drivers */ |
412 | list_for_each_entry(driver, &gadget_driver_pending_list, pending) { | |
413 | if (!driver->udc_name || strcmp(driver->udc_name, | |
414 | dev_name(&udc->dev)) == 0) { | |
415 | ret = udc_bind_to_driver(udc, driver); | |
31b994a4 MS |
416 | if (ret != -EPROBE_DEFER) |
417 | list_del(&driver->pending); | |
855ed04a RB |
418 | if (ret) |
419 | goto err4; | |
855ed04a RB |
420 | break; |
421 | } | |
422 | } | |
423 | ||
2ccea03a FB |
424 | mutex_unlock(&udc_lock); |
425 | ||
426 | return 0; | |
f07bd56b FB |
427 | |
428 | err4: | |
2ccea03a FB |
429 | list_del(&udc->list); |
430 | mutex_unlock(&udc_lock); | |
431 | ||
f07bd56b | 432 | err3: |
2ccea03a | 433 | put_device(&udc->dev); |
c93e64e9 | 434 | device_del(&gadget->dev); |
2ccea03a | 435 | |
f07bd56b | 436 | err2: |
7bce401c | 437 | put_device(&gadget->dev); |
c5dbc220 | 438 | kfree(udc); |
7bce401c | 439 | |
2ccea03a FB |
440 | err1: |
441 | return ret; | |
442 | } | |
792bfcf7 FB |
443 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); |
444 | ||
445 | /** | |
446 | * usb_add_gadget_udc - adds a new gadget to the udc class driver list | |
447 | * @parent: the parent device to this udc. Usually the controller | |
448 | * driver's device. | |
449 | * @gadget: the gadget to be added to the list | |
450 | * | |
451 | * Returns zero on success, negative errno otherwise. | |
452 | */ | |
453 | int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget) | |
454 | { | |
455 | return usb_add_gadget_udc_release(parent, gadget, NULL); | |
456 | } | |
2ccea03a FB |
457 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc); |
458 | ||
459 | static void usb_gadget_remove_driver(struct usb_udc *udc) | |
460 | { | |
461 | dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", | |
8da9fe8a | 462 | udc->driver->function); |
2ccea03a FB |
463 | |
464 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
465 | ||
2d7ebbb0 FB |
466 | usb_gadget_disconnect(udc->gadget); |
467 | udc->driver->disconnect(udc->gadget); | |
468 | udc->driver->unbind(udc->gadget); | |
2c683347 | 469 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
470 | |
471 | udc->driver = NULL; | |
472 | udc->dev.driver = NULL; | |
70d3a498 | 473 | udc->gadget->dev.driver = NULL; |
2ccea03a FB |
474 | } |
475 | ||
476 | /** | |
477 | * usb_del_gadget_udc - deletes @udc from udc_list | |
478 | * @gadget: the gadget to be removed. | |
479 | * | |
480 | * This, will call usb_gadget_unregister_driver() if | |
481 | * the @udc is still busy. | |
482 | */ | |
483 | void usb_del_gadget_udc(struct usb_gadget *gadget) | |
484 | { | |
dfea9c94 | 485 | struct usb_udc *udc = gadget->udc; |
2ccea03a | 486 | |
dfea9c94 PC |
487 | if (!udc) |
488 | return; | |
2ccea03a | 489 | |
2ccea03a FB |
490 | dev_vdbg(gadget->dev.parent, "unregistering gadget\n"); |
491 | ||
dfea9c94 | 492 | mutex_lock(&udc_lock); |
2ccea03a | 493 | list_del(&udc->list); |
2ccea03a | 494 | |
855ed04a RB |
495 | if (udc->driver) { |
496 | struct usb_gadget_driver *driver = udc->driver; | |
497 | ||
2ccea03a | 498 | usb_gadget_remove_driver(udc); |
855ed04a RB |
499 | list_add(&driver->pending, &gadget_driver_pending_list); |
500 | } | |
501 | mutex_unlock(&udc_lock); | |
2ccea03a FB |
502 | |
503 | kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); | |
5702f753 | 504 | flush_work(&gadget->work); |
2ccea03a | 505 | device_unregister(&udc->dev); |
7bce401c | 506 | device_unregister(&gadget->dev); |
2ccea03a FB |
507 | } |
508 | EXPORT_SYMBOL_GPL(usb_del_gadget_udc); | |
509 | ||
510 | /* ------------------------------------------------------------------------- */ | |
511 | ||
4c49a5f0 | 512 | static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) |
2ccea03a | 513 | { |
4c49a5f0 | 514 | int ret; |
2ccea03a | 515 | |
2ccea03a FB |
516 | dev_dbg(&udc->dev, "registering UDC driver [%s]\n", |
517 | driver->function); | |
518 | ||
519 | udc->driver = driver; | |
520 | udc->dev.driver = &driver->driver; | |
70d3a498 | 521 | udc->gadget->dev.driver = &driver->driver; |
2ccea03a | 522 | |
2d7ebbb0 FB |
523 | ret = driver->bind(udc->gadget, driver); |
524 | if (ret) | |
525 | goto err1; | |
2c683347 | 526 | ret = usb_gadget_udc_start(udc); |
2d7ebbb0 FB |
527 | if (ret) { |
528 | driver->unbind(udc->gadget); | |
529 | goto err1; | |
352c2dc8 | 530 | } |
628ef0d2 | 531 | usb_udc_connect_control(udc); |
2ccea03a FB |
532 | |
533 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
2ccea03a | 534 | return 0; |
2ccea03a | 535 | err1: |
f8cffc84 FE |
536 | if (ret != -EISNAM) |
537 | dev_err(&udc->dev, "failed to start %s: %d\n", | |
2ccea03a FB |
538 | udc->driver->function, ret); |
539 | udc->driver = NULL; | |
540 | udc->dev.driver = NULL; | |
70d3a498 | 541 | udc->gadget->dev.driver = NULL; |
4c49a5f0 SAS |
542 | return ret; |
543 | } | |
544 | ||
4c49a5f0 SAS |
545 | int usb_gadget_probe_driver(struct usb_gadget_driver *driver) |
546 | { | |
547 | struct usb_udc *udc = NULL; | |
2284b29d | 548 | int ret = -ENODEV; |
4c49a5f0 SAS |
549 | |
550 | if (!driver || !driver->bind || !driver->setup) | |
551 | return -EINVAL; | |
552 | ||
553 | mutex_lock(&udc_lock); | |
2284b29d RB |
554 | if (driver->udc_name) { |
555 | list_for_each_entry(udc, &udc_list, list) { | |
556 | ret = strcmp(driver->udc_name, dev_name(&udc->dev)); | |
557 | if (!ret) | |
558 | break; | |
559 | } | |
855ed04a | 560 | if (!ret && !udc->driver) |
4c49a5f0 | 561 | goto found; |
2284b29d RB |
562 | } else { |
563 | list_for_each_entry(udc, &udc_list, list) { | |
564 | /* For now we take the first one */ | |
565 | if (!udc->driver) | |
566 | goto found; | |
567 | } | |
4c49a5f0 SAS |
568 | } |
569 | ||
855ed04a RB |
570 | list_add_tail(&driver->pending, &gadget_driver_pending_list); |
571 | pr_info("udc-core: couldn't find an available UDC - added [%s] to list of pending drivers\n", | |
572 | driver->function); | |
4c49a5f0 | 573 | mutex_unlock(&udc_lock); |
855ed04a | 574 | return 0; |
4c49a5f0 SAS |
575 | found: |
576 | ret = udc_bind_to_driver(udc, driver); | |
2ccea03a FB |
577 | mutex_unlock(&udc_lock); |
578 | return ret; | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(usb_gadget_probe_driver); | |
581 | ||
582 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
583 | { | |
584 | struct usb_udc *udc = NULL; | |
585 | int ret = -ENODEV; | |
586 | ||
587 | if (!driver || !driver->unbind) | |
588 | return -EINVAL; | |
589 | ||
590 | mutex_lock(&udc_lock); | |
591 | list_for_each_entry(udc, &udc_list, list) | |
592 | if (udc->driver == driver) { | |
593 | usb_gadget_remove_driver(udc); | |
b5fb8d0a PC |
594 | usb_gadget_set_state(udc->gadget, |
595 | USB_STATE_NOTATTACHED); | |
2ccea03a FB |
596 | ret = 0; |
597 | break; | |
598 | } | |
599 | ||
855ed04a RB |
600 | if (ret) { |
601 | list_del(&driver->pending); | |
602 | ret = 0; | |
603 | } | |
2ccea03a FB |
604 | mutex_unlock(&udc_lock); |
605 | return ret; | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver); | |
608 | ||
609 | /* ------------------------------------------------------------------------- */ | |
610 | ||
611 | static ssize_t usb_udc_srp_store(struct device *dev, | |
612 | struct device_attribute *attr, const char *buf, size_t n) | |
613 | { | |
1d91a962 | 614 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
615 | |
616 | if (sysfs_streq(buf, "1")) | |
617 | usb_gadget_wakeup(udc->gadget); | |
618 | ||
619 | return n; | |
620 | } | |
621 | static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store); | |
622 | ||
623 | static ssize_t usb_udc_softconn_store(struct device *dev, | |
624 | struct device_attribute *attr, const char *buf, size_t n) | |
625 | { | |
865569ba | 626 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a | 627 | |
bfa6b18c FB |
628 | if (!udc->driver) { |
629 | dev_err(dev, "soft-connect without a gadget driver\n"); | |
630 | return -EOPNOTSUPP; | |
631 | } | |
632 | ||
2ccea03a | 633 | if (sysfs_streq(buf, "connect")) { |
2c683347 | 634 | usb_gadget_udc_start(udc); |
2ccea03a FB |
635 | usb_gadget_connect(udc->gadget); |
636 | } else if (sysfs_streq(buf, "disconnect")) { | |
83a787a7 | 637 | usb_gadget_disconnect(udc->gadget); |
0abd0696 | 638 | udc->driver->disconnect(udc->gadget); |
2c683347 | 639 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
640 | } else { |
641 | dev_err(dev, "unsupported command '%s'\n", buf); | |
642 | return -EINVAL; | |
643 | } | |
644 | ||
645 | return n; | |
646 | } | |
647 | static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store); | |
648 | ||
ce26bd23 GKH |
649 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
650 | char *buf) | |
49401f41 FB |
651 | { |
652 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
653 | struct usb_gadget *gadget = udc->gadget; | |
654 | ||
655 | return sprintf(buf, "%s\n", usb_state_string(gadget->state)); | |
656 | } | |
ce26bd23 | 657 | static DEVICE_ATTR_RO(state); |
49401f41 | 658 | |
d327ab5b | 659 | #define USB_UDC_SPEED_ATTR(name, param) \ |
ce26bd23 | 660 | ssize_t name##_show(struct device *dev, \ |
d327ab5b MN |
661 | struct device_attribute *attr, char *buf) \ |
662 | { \ | |
663 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ | |
664 | return snprintf(buf, PAGE_SIZE, "%s\n", \ | |
665 | usb_speed_string(udc->gadget->param)); \ | |
666 | } \ | |
ce26bd23 | 667 | static DEVICE_ATTR_RO(name) |
d327ab5b MN |
668 | |
669 | static USB_UDC_SPEED_ATTR(current_speed, speed); | |
670 | static USB_UDC_SPEED_ATTR(maximum_speed, max_speed); | |
671 | ||
2ccea03a | 672 | #define USB_UDC_ATTR(name) \ |
ce26bd23 | 673 | ssize_t name##_show(struct device *dev, \ |
2ccea03a FB |
674 | struct device_attribute *attr, char *buf) \ |
675 | { \ | |
019f976e | 676 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ |
2ccea03a FB |
677 | struct usb_gadget *gadget = udc->gadget; \ |
678 | \ | |
679 | return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \ | |
680 | } \ | |
ce26bd23 | 681 | static DEVICE_ATTR_RO(name) |
2ccea03a | 682 | |
2ccea03a FB |
683 | static USB_UDC_ATTR(is_otg); |
684 | static USB_UDC_ATTR(is_a_peripheral); | |
685 | static USB_UDC_ATTR(b_hnp_enable); | |
686 | static USB_UDC_ATTR(a_hnp_support); | |
687 | static USB_UDC_ATTR(a_alt_hnp_support); | |
3f6dd4fe | 688 | static USB_UDC_ATTR(is_selfpowered); |
2ccea03a FB |
689 | |
690 | static struct attribute *usb_udc_attrs[] = { | |
691 | &dev_attr_srp.attr, | |
692 | &dev_attr_soft_connect.attr, | |
49401f41 | 693 | &dev_attr_state.attr, |
d327ab5b MN |
694 | &dev_attr_current_speed.attr, |
695 | &dev_attr_maximum_speed.attr, | |
2ccea03a | 696 | |
2ccea03a FB |
697 | &dev_attr_is_otg.attr, |
698 | &dev_attr_is_a_peripheral.attr, | |
699 | &dev_attr_b_hnp_enable.attr, | |
700 | &dev_attr_a_hnp_support.attr, | |
701 | &dev_attr_a_alt_hnp_support.attr, | |
3f6dd4fe | 702 | &dev_attr_is_selfpowered.attr, |
2ccea03a FB |
703 | NULL, |
704 | }; | |
705 | ||
706 | static const struct attribute_group usb_udc_attr_group = { | |
707 | .attrs = usb_udc_attrs, | |
708 | }; | |
709 | ||
710 | static const struct attribute_group *usb_udc_attr_groups[] = { | |
711 | &usb_udc_attr_group, | |
712 | NULL, | |
713 | }; | |
714 | ||
715 | static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) | |
716 | { | |
717 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
718 | int ret; | |
719 | ||
720 | ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name); | |
721 | if (ret) { | |
722 | dev_err(dev, "failed to add uevent USB_UDC_NAME\n"); | |
723 | return ret; | |
724 | } | |
725 | ||
726 | if (udc->driver) { | |
727 | ret = add_uevent_var(env, "USB_UDC_DRIVER=%s", | |
728 | udc->driver->function); | |
729 | if (ret) { | |
730 | dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n"); | |
731 | return ret; | |
732 | } | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static int __init usb_udc_init(void) | |
739 | { | |
740 | udc_class = class_create(THIS_MODULE, "udc"); | |
741 | if (IS_ERR(udc_class)) { | |
742 | pr_err("failed to create udc class --> %ld\n", | |
743 | PTR_ERR(udc_class)); | |
744 | return PTR_ERR(udc_class); | |
745 | } | |
746 | ||
747 | udc_class->dev_uevent = usb_udc_uevent; | |
2ccea03a FB |
748 | return 0; |
749 | } | |
750 | subsys_initcall(usb_udc_init); | |
751 | ||
752 | static void __exit usb_udc_exit(void) | |
753 | { | |
754 | class_destroy(udc_class); | |
755 | } | |
756 | module_exit(usb_udc_exit); | |
757 | ||
758 | MODULE_DESCRIPTION("UDC Framework"); | |
759 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); | |
760 | MODULE_LICENSE("GPL v2"); |