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Commit | Line | Data |
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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 | { | |
63 | if (req->length == 0) | |
64 | return 0; | |
65 | ||
66 | if (req->num_sgs) { | |
67 | int mapped; | |
68 | ||
69 | mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs, | |
70 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
71 | if (mapped == 0) { | |
72 | dev_err(&gadget->dev, "failed to map SGs\n"); | |
73 | return -EFAULT; | |
74 | } | |
75 | ||
76 | req->num_mapped_sgs = mapped; | |
77 | } else { | |
78 | req->dma = dma_map_single(&gadget->dev, req->buf, req->length, | |
79 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
80 | ||
81 | if (dma_mapping_error(&gadget->dev, req->dma)) { | |
82 | dev_err(&gadget->dev, "failed to map buffer\n"); | |
83 | return -EFAULT; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(usb_gadget_map_request); | |
90 | ||
91 | void usb_gadget_unmap_request(struct usb_gadget *gadget, | |
92 | struct usb_request *req, int is_in) | |
93 | { | |
94 | if (req->length == 0) | |
95 | return; | |
96 | ||
97 | if (req->num_mapped_sgs) { | |
98 | dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs, | |
99 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
100 | ||
101 | req->num_mapped_sgs = 0; | |
102 | } else { | |
103 | dma_unmap_single(&gadget->dev, req->dma, req->length, | |
104 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
105 | } | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); | |
108 | ||
908b9613 AS |
109 | #endif /* CONFIG_HAS_DMA */ |
110 | ||
a698908d FB |
111 | /* ------------------------------------------------------------------------- */ |
112 | ||
3fc2aa55 MS |
113 | /** |
114 | * usb_gadget_giveback_request - give the request back to the gadget layer | |
115 | * Context: in_interrupt() | |
116 | * | |
117 | * This is called by device controller drivers in order to return the | |
118 | * completed request back to the gadget layer. | |
119 | */ | |
120 | void usb_gadget_giveback_request(struct usb_ep *ep, | |
121 | struct usb_request *req) | |
122 | { | |
0cfbd328 MS |
123 | if (likely(req->status == 0)) |
124 | usb_led_activity(USB_LED_EVENT_GADGET); | |
125 | ||
3fc2aa55 MS |
126 | req->complete(ep, req); |
127 | } | |
128 | EXPORT_SYMBOL_GPL(usb_gadget_giveback_request); | |
129 | ||
130 | /* ------------------------------------------------------------------------- */ | |
131 | ||
5702f753 FB |
132 | static void usb_gadget_state_work(struct work_struct *work) |
133 | { | |
dfea9c94 PC |
134 | struct usb_gadget *gadget = work_to_gadget(work); |
135 | struct usb_udc *udc = gadget->udc; | |
5702f753 | 136 | |
dfea9c94 PC |
137 | if (udc) |
138 | sysfs_notify(&udc->dev.kobj, NULL, "state"); | |
5702f753 FB |
139 | } |
140 | ||
49401f41 FB |
141 | void usb_gadget_set_state(struct usb_gadget *gadget, |
142 | enum usb_device_state state) | |
143 | { | |
144 | gadget->state = state; | |
5702f753 | 145 | schedule_work(&gadget->work); |
49401f41 FB |
146 | } |
147 | EXPORT_SYMBOL_GPL(usb_gadget_set_state); | |
148 | ||
149 | /* ------------------------------------------------------------------------- */ | |
150 | ||
628ef0d2 PC |
151 | static void usb_udc_connect_control(struct usb_udc *udc) |
152 | { | |
153 | if (udc->vbus) | |
154 | usb_gadget_connect(udc->gadget); | |
155 | else | |
156 | usb_gadget_disconnect(udc->gadget); | |
157 | } | |
158 | ||
159 | /** | |
160 | * usb_udc_vbus_handler - updates the udc core vbus status, and try to | |
161 | * connect or disconnect gadget | |
162 | * @gadget: The gadget which vbus change occurs | |
163 | * @status: The vbus status | |
164 | * | |
165 | * The udc driver calls it when it wants to connect or disconnect gadget | |
166 | * according to vbus status. | |
167 | */ | |
168 | void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) | |
169 | { | |
170 | struct usb_udc *udc = gadget->udc; | |
171 | ||
172 | if (udc) { | |
173 | udc->vbus = status; | |
174 | usb_udc_connect_control(udc); | |
175 | } | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); | |
178 | ||
974a70bd PC |
179 | /** |
180 | * usb_gadget_udc_reset - notifies the udc core that bus reset occurs | |
181 | * @gadget: The gadget which bus reset occurs | |
182 | * @driver: The gadget driver we want to notify | |
183 | * | |
184 | * If the udc driver has bus reset handler, it needs to call this when the bus | |
185 | * reset occurs, it notifies the gadget driver that the bus reset occurs as | |
186 | * well as updates gadget state. | |
187 | */ | |
188 | void usb_gadget_udc_reset(struct usb_gadget *gadget, | |
189 | struct usb_gadget_driver *driver) | |
190 | { | |
191 | driver->reset(gadget); | |
192 | usb_gadget_set_state(gadget, USB_STATE_DEFAULT); | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(usb_gadget_udc_reset); | |
195 | ||
352c2dc8 SAS |
196 | /** |
197 | * usb_gadget_udc_start - tells usb device controller to start up | |
2c683347 | 198 | * @udc: The UDC to be started |
352c2dc8 SAS |
199 | * |
200 | * This call is issued by the UDC Class driver when it's about | |
201 | * to register a gadget driver to the device controller, before | |
202 | * calling gadget driver's bind() method. | |
203 | * | |
204 | * It allows the controller to be powered off until strictly | |
205 | * necessary to have it powered on. | |
206 | * | |
207 | * Returns zero on success, else negative errno. | |
208 | */ | |
2c683347 | 209 | static inline int usb_gadget_udc_start(struct usb_udc *udc) |
352c2dc8 | 210 | { |
2c683347 | 211 | return udc->gadget->ops->udc_start(udc->gadget, udc->driver); |
352c2dc8 SAS |
212 | } |
213 | ||
352c2dc8 SAS |
214 | /** |
215 | * usb_gadget_udc_stop - tells usb device controller we don't need it anymore | |
216 | * @gadget: The device we want to stop activity | |
217 | * @driver: The driver to unbind from @gadget | |
218 | * | |
219 | * This call is issued by the UDC Class driver after calling | |
220 | * gadget driver's unbind() method. | |
221 | * | |
222 | * The details are implementation specific, but it can go as | |
223 | * far as powering off UDC completely and disable its data | |
224 | * line pullups. | |
225 | */ | |
2c683347 | 226 | static inline void usb_gadget_udc_stop(struct usb_udc *udc) |
352c2dc8 | 227 | { |
22835b80 | 228 | udc->gadget->ops->udc_stop(udc->gadget); |
352c2dc8 SAS |
229 | } |
230 | ||
2ccea03a FB |
231 | /** |
232 | * usb_udc_release - release the usb_udc struct | |
233 | * @dev: the dev member within usb_udc | |
234 | * | |
235 | * This is called by driver's core in order to free memory once the last | |
236 | * reference is released. | |
237 | */ | |
238 | static void usb_udc_release(struct device *dev) | |
239 | { | |
240 | struct usb_udc *udc; | |
241 | ||
242 | udc = container_of(dev, struct usb_udc, dev); | |
243 | dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); | |
244 | kfree(udc); | |
245 | } | |
246 | ||
019f976e | 247 | static const struct attribute_group *usb_udc_attr_groups[]; |
792bfcf7 FB |
248 | |
249 | static void usb_udc_nop_release(struct device *dev) | |
250 | { | |
251 | dev_vdbg(dev, "%s\n", __func__); | |
252 | } | |
253 | ||
2ccea03a | 254 | /** |
792bfcf7 FB |
255 | * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list |
256 | * @parent: the parent device to this udc. Usually the controller driver's | |
257 | * device. | |
258 | * @gadget: the gadget to be added to the list. | |
259 | * @release: a gadget release function. | |
2ccea03a FB |
260 | * |
261 | * Returns zero on success, negative errno otherwise. | |
262 | */ | |
792bfcf7 FB |
263 | int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, |
264 | void (*release)(struct device *dev)) | |
2ccea03a FB |
265 | { |
266 | struct usb_udc *udc; | |
267 | int ret = -ENOMEM; | |
268 | ||
269 | udc = kzalloc(sizeof(*udc), GFP_KERNEL); | |
270 | if (!udc) | |
271 | goto err1; | |
272 | ||
7bce401c | 273 | dev_set_name(&gadget->dev, "gadget"); |
5702f753 | 274 | INIT_WORK(&gadget->work, usb_gadget_state_work); |
2ed14320 | 275 | gadget->dev.parent = parent; |
f07bd56b | 276 | |
908b9613 | 277 | #ifdef CONFIG_HAS_DMA |
658c8cf1 FB |
278 | dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask); |
279 | gadget->dev.dma_parms = parent->dma_parms; | |
280 | gadget->dev.dma_mask = parent->dma_mask; | |
908b9613 | 281 | #endif |
658c8cf1 | 282 | |
ddf47ccb | 283 | if (release) |
792bfcf7 | 284 | gadget->dev.release = release; |
ddf47ccb FB |
285 | else |
286 | gadget->dev.release = usb_udc_nop_release; | |
792bfcf7 | 287 | |
7bce401c FB |
288 | ret = device_register(&gadget->dev); |
289 | if (ret) | |
290 | goto err2; | |
f07bd56b | 291 | |
2ccea03a FB |
292 | device_initialize(&udc->dev); |
293 | udc->dev.release = usb_udc_release; | |
294 | udc->dev.class = udc_class; | |
019f976e | 295 | udc->dev.groups = usb_udc_attr_groups; |
2ccea03a FB |
296 | udc->dev.parent = parent; |
297 | ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); | |
298 | if (ret) | |
f07bd56b | 299 | goto err3; |
2ccea03a FB |
300 | |
301 | udc->gadget = gadget; | |
dfea9c94 | 302 | gadget->udc = udc; |
2ccea03a FB |
303 | |
304 | mutex_lock(&udc_lock); | |
305 | list_add_tail(&udc->list, &udc_list); | |
306 | ||
307 | ret = device_add(&udc->dev); | |
308 | if (ret) | |
f07bd56b | 309 | goto err4; |
2ccea03a | 310 | |
49401f41 | 311 | usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); |
628ef0d2 | 312 | udc->vbus = true; |
2ccea03a FB |
313 | |
314 | mutex_unlock(&udc_lock); | |
315 | ||
316 | return 0; | |
f07bd56b FB |
317 | |
318 | err4: | |
2ccea03a FB |
319 | list_del(&udc->list); |
320 | mutex_unlock(&udc_lock); | |
321 | ||
f07bd56b | 322 | err3: |
2ccea03a FB |
323 | put_device(&udc->dev); |
324 | ||
f07bd56b | 325 | err2: |
7bce401c | 326 | put_device(&gadget->dev); |
c5dbc220 | 327 | kfree(udc); |
7bce401c | 328 | |
2ccea03a FB |
329 | err1: |
330 | return ret; | |
331 | } | |
792bfcf7 FB |
332 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); |
333 | ||
334 | /** | |
335 | * usb_add_gadget_udc - adds a new gadget to the udc class driver list | |
336 | * @parent: the parent device to this udc. Usually the controller | |
337 | * driver's device. | |
338 | * @gadget: the gadget to be added to the list | |
339 | * | |
340 | * Returns zero on success, negative errno otherwise. | |
341 | */ | |
342 | int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget) | |
343 | { | |
344 | return usb_add_gadget_udc_release(parent, gadget, NULL); | |
345 | } | |
2ccea03a FB |
346 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc); |
347 | ||
348 | static void usb_gadget_remove_driver(struct usb_udc *udc) | |
349 | { | |
350 | dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", | |
8da9fe8a | 351 | udc->driver->function); |
2ccea03a FB |
352 | |
353 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
354 | ||
2d7ebbb0 FB |
355 | usb_gadget_disconnect(udc->gadget); |
356 | udc->driver->disconnect(udc->gadget); | |
357 | udc->driver->unbind(udc->gadget); | |
2c683347 | 358 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
359 | |
360 | udc->driver = NULL; | |
361 | udc->dev.driver = NULL; | |
70d3a498 | 362 | udc->gadget->dev.driver = NULL; |
2ccea03a FB |
363 | } |
364 | ||
365 | /** | |
366 | * usb_del_gadget_udc - deletes @udc from udc_list | |
367 | * @gadget: the gadget to be removed. | |
368 | * | |
369 | * This, will call usb_gadget_unregister_driver() if | |
370 | * the @udc is still busy. | |
371 | */ | |
372 | void usb_del_gadget_udc(struct usb_gadget *gadget) | |
373 | { | |
dfea9c94 | 374 | struct usb_udc *udc = gadget->udc; |
2ccea03a | 375 | |
dfea9c94 PC |
376 | if (!udc) |
377 | return; | |
2ccea03a | 378 | |
2ccea03a FB |
379 | dev_vdbg(gadget->dev.parent, "unregistering gadget\n"); |
380 | ||
dfea9c94 | 381 | mutex_lock(&udc_lock); |
2ccea03a FB |
382 | list_del(&udc->list); |
383 | mutex_unlock(&udc_lock); | |
384 | ||
385 | if (udc->driver) | |
386 | usb_gadget_remove_driver(udc); | |
387 | ||
388 | kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); | |
5702f753 | 389 | flush_work(&gadget->work); |
2ccea03a | 390 | device_unregister(&udc->dev); |
7bce401c | 391 | device_unregister(&gadget->dev); |
2ccea03a FB |
392 | } |
393 | EXPORT_SYMBOL_GPL(usb_del_gadget_udc); | |
394 | ||
395 | /* ------------------------------------------------------------------------- */ | |
396 | ||
4c49a5f0 | 397 | static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) |
2ccea03a | 398 | { |
4c49a5f0 | 399 | int ret; |
2ccea03a | 400 | |
2ccea03a FB |
401 | dev_dbg(&udc->dev, "registering UDC driver [%s]\n", |
402 | driver->function); | |
403 | ||
404 | udc->driver = driver; | |
405 | udc->dev.driver = &driver->driver; | |
70d3a498 | 406 | udc->gadget->dev.driver = &driver->driver; |
2ccea03a | 407 | |
2d7ebbb0 FB |
408 | ret = driver->bind(udc->gadget, driver); |
409 | if (ret) | |
410 | goto err1; | |
2c683347 | 411 | ret = usb_gadget_udc_start(udc); |
2d7ebbb0 FB |
412 | if (ret) { |
413 | driver->unbind(udc->gadget); | |
414 | goto err1; | |
352c2dc8 | 415 | } |
628ef0d2 | 416 | usb_udc_connect_control(udc); |
2ccea03a FB |
417 | |
418 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
2ccea03a | 419 | return 0; |
2ccea03a | 420 | err1: |
f8cffc84 FE |
421 | if (ret != -EISNAM) |
422 | dev_err(&udc->dev, "failed to start %s: %d\n", | |
2ccea03a FB |
423 | udc->driver->function, ret); |
424 | udc->driver = NULL; | |
425 | udc->dev.driver = NULL; | |
70d3a498 | 426 | udc->gadget->dev.driver = NULL; |
4c49a5f0 SAS |
427 | return ret; |
428 | } | |
429 | ||
02e8c966 | 430 | int usb_udc_attach_driver(const char *name, struct usb_gadget_driver *driver) |
4c49a5f0 SAS |
431 | { |
432 | struct usb_udc *udc = NULL; | |
433 | int ret = -ENODEV; | |
434 | ||
435 | mutex_lock(&udc_lock); | |
436 | list_for_each_entry(udc, &udc_list, list) { | |
437 | ret = strcmp(name, dev_name(&udc->dev)); | |
438 | if (!ret) | |
439 | break; | |
440 | } | |
441 | if (ret) { | |
442 | ret = -ENODEV; | |
443 | goto out; | |
444 | } | |
445 | if (udc->driver) { | |
446 | ret = -EBUSY; | |
447 | goto out; | |
448 | } | |
449 | ret = udc_bind_to_driver(udc, driver); | |
450 | out: | |
451 | mutex_unlock(&udc_lock); | |
452 | return ret; | |
453 | } | |
02e8c966 | 454 | EXPORT_SYMBOL_GPL(usb_udc_attach_driver); |
4c49a5f0 SAS |
455 | |
456 | int usb_gadget_probe_driver(struct usb_gadget_driver *driver) | |
457 | { | |
458 | struct usb_udc *udc = NULL; | |
459 | int ret; | |
460 | ||
461 | if (!driver || !driver->bind || !driver->setup) | |
462 | return -EINVAL; | |
463 | ||
464 | mutex_lock(&udc_lock); | |
465 | list_for_each_entry(udc, &udc_list, list) { | |
466 | /* For now we take the first one */ | |
467 | if (!udc->driver) | |
468 | goto found; | |
469 | } | |
470 | ||
471 | pr_debug("couldn't find an available UDC\n"); | |
472 | mutex_unlock(&udc_lock); | |
473 | return -ENODEV; | |
474 | found: | |
475 | ret = udc_bind_to_driver(udc, driver); | |
2ccea03a FB |
476 | mutex_unlock(&udc_lock); |
477 | return ret; | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(usb_gadget_probe_driver); | |
480 | ||
481 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
482 | { | |
483 | struct usb_udc *udc = NULL; | |
484 | int ret = -ENODEV; | |
485 | ||
486 | if (!driver || !driver->unbind) | |
487 | return -EINVAL; | |
488 | ||
489 | mutex_lock(&udc_lock); | |
490 | list_for_each_entry(udc, &udc_list, list) | |
491 | if (udc->driver == driver) { | |
492 | usb_gadget_remove_driver(udc); | |
b5fb8d0a PC |
493 | usb_gadget_set_state(udc->gadget, |
494 | USB_STATE_NOTATTACHED); | |
2ccea03a FB |
495 | ret = 0; |
496 | break; | |
497 | } | |
498 | ||
499 | mutex_unlock(&udc_lock); | |
500 | return ret; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver); | |
503 | ||
504 | /* ------------------------------------------------------------------------- */ | |
505 | ||
506 | static ssize_t usb_udc_srp_store(struct device *dev, | |
507 | struct device_attribute *attr, const char *buf, size_t n) | |
508 | { | |
1d91a962 | 509 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
510 | |
511 | if (sysfs_streq(buf, "1")) | |
512 | usb_gadget_wakeup(udc->gadget); | |
513 | ||
514 | return n; | |
515 | } | |
516 | static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store); | |
517 | ||
518 | static ssize_t usb_udc_softconn_store(struct device *dev, | |
519 | struct device_attribute *attr, const char *buf, size_t n) | |
520 | { | |
865569ba | 521 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a | 522 | |
bfa6b18c FB |
523 | if (!udc->driver) { |
524 | dev_err(dev, "soft-connect without a gadget driver\n"); | |
525 | return -EOPNOTSUPP; | |
526 | } | |
527 | ||
2ccea03a | 528 | if (sysfs_streq(buf, "connect")) { |
2c683347 | 529 | usb_gadget_udc_start(udc); |
2ccea03a FB |
530 | usb_gadget_connect(udc->gadget); |
531 | } else if (sysfs_streq(buf, "disconnect")) { | |
83a787a7 | 532 | usb_gadget_disconnect(udc->gadget); |
0abd0696 | 533 | udc->driver->disconnect(udc->gadget); |
2c683347 | 534 | usb_gadget_udc_stop(udc); |
2ccea03a FB |
535 | } else { |
536 | dev_err(dev, "unsupported command '%s'\n", buf); | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | return n; | |
541 | } | |
542 | static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store); | |
543 | ||
ce26bd23 GKH |
544 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
545 | char *buf) | |
49401f41 FB |
546 | { |
547 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
548 | struct usb_gadget *gadget = udc->gadget; | |
549 | ||
550 | return sprintf(buf, "%s\n", usb_state_string(gadget->state)); | |
551 | } | |
ce26bd23 | 552 | static DEVICE_ATTR_RO(state); |
49401f41 | 553 | |
d327ab5b | 554 | #define USB_UDC_SPEED_ATTR(name, param) \ |
ce26bd23 | 555 | ssize_t name##_show(struct device *dev, \ |
d327ab5b MN |
556 | struct device_attribute *attr, char *buf) \ |
557 | { \ | |
558 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ | |
559 | return snprintf(buf, PAGE_SIZE, "%s\n", \ | |
560 | usb_speed_string(udc->gadget->param)); \ | |
561 | } \ | |
ce26bd23 | 562 | static DEVICE_ATTR_RO(name) |
d327ab5b MN |
563 | |
564 | static USB_UDC_SPEED_ATTR(current_speed, speed); | |
565 | static USB_UDC_SPEED_ATTR(maximum_speed, max_speed); | |
566 | ||
2ccea03a | 567 | #define USB_UDC_ATTR(name) \ |
ce26bd23 | 568 | ssize_t name##_show(struct device *dev, \ |
2ccea03a FB |
569 | struct device_attribute *attr, char *buf) \ |
570 | { \ | |
019f976e | 571 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ |
2ccea03a FB |
572 | struct usb_gadget *gadget = udc->gadget; \ |
573 | \ | |
574 | return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \ | |
575 | } \ | |
ce26bd23 | 576 | static DEVICE_ATTR_RO(name) |
2ccea03a | 577 | |
2ccea03a FB |
578 | static USB_UDC_ATTR(is_otg); |
579 | static USB_UDC_ATTR(is_a_peripheral); | |
580 | static USB_UDC_ATTR(b_hnp_enable); | |
581 | static USB_UDC_ATTR(a_hnp_support); | |
582 | static USB_UDC_ATTR(a_alt_hnp_support); | |
3f6dd4fe | 583 | static USB_UDC_ATTR(is_selfpowered); |
2ccea03a FB |
584 | |
585 | static struct attribute *usb_udc_attrs[] = { | |
586 | &dev_attr_srp.attr, | |
587 | &dev_attr_soft_connect.attr, | |
49401f41 | 588 | &dev_attr_state.attr, |
d327ab5b MN |
589 | &dev_attr_current_speed.attr, |
590 | &dev_attr_maximum_speed.attr, | |
2ccea03a | 591 | |
2ccea03a FB |
592 | &dev_attr_is_otg.attr, |
593 | &dev_attr_is_a_peripheral.attr, | |
594 | &dev_attr_b_hnp_enable.attr, | |
595 | &dev_attr_a_hnp_support.attr, | |
596 | &dev_attr_a_alt_hnp_support.attr, | |
3f6dd4fe | 597 | &dev_attr_is_selfpowered.attr, |
2ccea03a FB |
598 | NULL, |
599 | }; | |
600 | ||
601 | static const struct attribute_group usb_udc_attr_group = { | |
602 | .attrs = usb_udc_attrs, | |
603 | }; | |
604 | ||
605 | static const struct attribute_group *usb_udc_attr_groups[] = { | |
606 | &usb_udc_attr_group, | |
607 | NULL, | |
608 | }; | |
609 | ||
610 | static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) | |
611 | { | |
612 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
613 | int ret; | |
614 | ||
615 | ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name); | |
616 | if (ret) { | |
617 | dev_err(dev, "failed to add uevent USB_UDC_NAME\n"); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | if (udc->driver) { | |
622 | ret = add_uevent_var(env, "USB_UDC_DRIVER=%s", | |
623 | udc->driver->function); | |
624 | if (ret) { | |
625 | dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n"); | |
626 | return ret; | |
627 | } | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static int __init usb_udc_init(void) | |
634 | { | |
635 | udc_class = class_create(THIS_MODULE, "udc"); | |
636 | if (IS_ERR(udc_class)) { | |
637 | pr_err("failed to create udc class --> %ld\n", | |
638 | PTR_ERR(udc_class)); | |
639 | return PTR_ERR(udc_class); | |
640 | } | |
641 | ||
642 | udc_class->dev_uevent = usb_udc_uevent; | |
2ccea03a FB |
643 | return 0; |
644 | } | |
645 | subsys_initcall(usb_udc_init); | |
646 | ||
647 | static void __exit usb_udc_exit(void) | |
648 | { | |
649 | class_destroy(udc_class); | |
650 | } | |
651 | module_exit(usb_udc_exit); | |
652 | ||
653 | MODULE_DESCRIPTION("UDC Framework"); | |
654 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); | |
655 | MODULE_LICENSE("GPL v2"); |