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> | |
30 | ||
31 | /** | |
32 | * struct usb_udc - describes one usb device controller | |
33 | * @driver - the gadget driver pointer. For use by the class code | |
34 | * @dev - the child device to the actual controller | |
35 | * @gadget - the gadget. For use by the class code | |
36 | * @list - for use by the udc class driver | |
37 | * | |
38 | * This represents the internal data structure which is used by the UDC-class | |
39 | * to hold information about udc driver and gadget together. | |
40 | */ | |
41 | struct usb_udc { | |
42 | struct usb_gadget_driver *driver; | |
43 | struct usb_gadget *gadget; | |
44 | struct device dev; | |
45 | struct list_head list; | |
46 | }; | |
47 | ||
48 | static struct class *udc_class; | |
2ccea03a FB |
49 | static LIST_HEAD(udc_list); |
50 | static DEFINE_MUTEX(udc_lock); | |
51 | ||
52 | /* ------------------------------------------------------------------------- */ | |
53 | ||
908b9613 AS |
54 | #ifdef CONFIG_HAS_DMA |
55 | ||
a698908d FB |
56 | int usb_gadget_map_request(struct usb_gadget *gadget, |
57 | struct usb_request *req, int is_in) | |
58 | { | |
59 | if (req->length == 0) | |
60 | return 0; | |
61 | ||
62 | if (req->num_sgs) { | |
63 | int mapped; | |
64 | ||
65 | mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs, | |
66 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
67 | if (mapped == 0) { | |
68 | dev_err(&gadget->dev, "failed to map SGs\n"); | |
69 | return -EFAULT; | |
70 | } | |
71 | ||
72 | req->num_mapped_sgs = mapped; | |
73 | } else { | |
74 | req->dma = dma_map_single(&gadget->dev, req->buf, req->length, | |
75 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
76 | ||
77 | if (dma_mapping_error(&gadget->dev, req->dma)) { | |
78 | dev_err(&gadget->dev, "failed to map buffer\n"); | |
79 | return -EFAULT; | |
80 | } | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(usb_gadget_map_request); | |
86 | ||
87 | void usb_gadget_unmap_request(struct usb_gadget *gadget, | |
88 | struct usb_request *req, int is_in) | |
89 | { | |
90 | if (req->length == 0) | |
91 | return; | |
92 | ||
93 | if (req->num_mapped_sgs) { | |
94 | dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs, | |
95 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
96 | ||
97 | req->num_mapped_sgs = 0; | |
98 | } else { | |
99 | dma_unmap_single(&gadget->dev, req->dma, req->length, | |
100 | is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
101 | } | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); | |
104 | ||
908b9613 AS |
105 | #endif /* CONFIG_HAS_DMA */ |
106 | ||
a698908d FB |
107 | /* ------------------------------------------------------------------------- */ |
108 | ||
5702f753 FB |
109 | static void usb_gadget_state_work(struct work_struct *work) |
110 | { | |
111 | struct usb_gadget *gadget = work_to_gadget(work); | |
112 | ||
165f6064 | 113 | sysfs_notify(&gadget->dev.kobj, NULL, "state"); |
5702f753 FB |
114 | } |
115 | ||
49401f41 FB |
116 | void usb_gadget_set_state(struct usb_gadget *gadget, |
117 | enum usb_device_state state) | |
118 | { | |
119 | gadget->state = state; | |
5702f753 | 120 | schedule_work(&gadget->work); |
49401f41 FB |
121 | } |
122 | EXPORT_SYMBOL_GPL(usb_gadget_set_state); | |
123 | ||
124 | /* ------------------------------------------------------------------------- */ | |
125 | ||
352c2dc8 SAS |
126 | /** |
127 | * usb_gadget_udc_start - tells usb device controller to start up | |
128 | * @gadget: The gadget we want to get started | |
129 | * @driver: The driver we want to bind to @gadget | |
130 | * | |
131 | * This call is issued by the UDC Class driver when it's about | |
132 | * to register a gadget driver to the device controller, before | |
133 | * calling gadget driver's bind() method. | |
134 | * | |
135 | * It allows the controller to be powered off until strictly | |
136 | * necessary to have it powered on. | |
137 | * | |
138 | * Returns zero on success, else negative errno. | |
139 | */ | |
140 | static inline int usb_gadget_udc_start(struct usb_gadget *gadget, | |
141 | struct usb_gadget_driver *driver) | |
142 | { | |
143 | return gadget->ops->udc_start(gadget, driver); | |
144 | } | |
145 | ||
352c2dc8 SAS |
146 | /** |
147 | * usb_gadget_udc_stop - tells usb device controller we don't need it anymore | |
148 | * @gadget: The device we want to stop activity | |
149 | * @driver: The driver to unbind from @gadget | |
150 | * | |
151 | * This call is issued by the UDC Class driver after calling | |
152 | * gadget driver's unbind() method. | |
153 | * | |
154 | * The details are implementation specific, but it can go as | |
155 | * far as powering off UDC completely and disable its data | |
156 | * line pullups. | |
157 | */ | |
158 | static inline void usb_gadget_udc_stop(struct usb_gadget *gadget, | |
159 | struct usb_gadget_driver *driver) | |
160 | { | |
161 | gadget->ops->udc_stop(gadget, driver); | |
162 | } | |
163 | ||
2ccea03a FB |
164 | /** |
165 | * usb_udc_release - release the usb_udc struct | |
166 | * @dev: the dev member within usb_udc | |
167 | * | |
168 | * This is called by driver's core in order to free memory once the last | |
169 | * reference is released. | |
170 | */ | |
171 | static void usb_udc_release(struct device *dev) | |
172 | { | |
173 | struct usb_udc *udc; | |
174 | ||
175 | udc = container_of(dev, struct usb_udc, dev); | |
176 | dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); | |
177 | kfree(udc); | |
178 | } | |
179 | ||
019f976e | 180 | static const struct attribute_group *usb_udc_attr_groups[]; |
792bfcf7 FB |
181 | |
182 | static void usb_udc_nop_release(struct device *dev) | |
183 | { | |
184 | dev_vdbg(dev, "%s\n", __func__); | |
185 | } | |
186 | ||
2ccea03a | 187 | /** |
792bfcf7 FB |
188 | * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list |
189 | * @parent: the parent device to this udc. Usually the controller driver's | |
190 | * device. | |
191 | * @gadget: the gadget to be added to the list. | |
192 | * @release: a gadget release function. | |
2ccea03a FB |
193 | * |
194 | * Returns zero on success, negative errno otherwise. | |
195 | */ | |
792bfcf7 FB |
196 | int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, |
197 | void (*release)(struct device *dev)) | |
2ccea03a FB |
198 | { |
199 | struct usb_udc *udc; | |
200 | int ret = -ENOMEM; | |
201 | ||
202 | udc = kzalloc(sizeof(*udc), GFP_KERNEL); | |
203 | if (!udc) | |
204 | goto err1; | |
205 | ||
7bce401c | 206 | dev_set_name(&gadget->dev, "gadget"); |
5702f753 | 207 | INIT_WORK(&gadget->work, usb_gadget_state_work); |
2ed14320 | 208 | gadget->dev.parent = parent; |
f07bd56b | 209 | |
908b9613 | 210 | #ifdef CONFIG_HAS_DMA |
658c8cf1 FB |
211 | dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask); |
212 | gadget->dev.dma_parms = parent->dma_parms; | |
213 | gadget->dev.dma_mask = parent->dma_mask; | |
908b9613 | 214 | #endif |
658c8cf1 | 215 | |
ddf47ccb | 216 | if (release) |
792bfcf7 | 217 | gadget->dev.release = release; |
ddf47ccb FB |
218 | else |
219 | gadget->dev.release = usb_udc_nop_release; | |
792bfcf7 | 220 | |
7bce401c FB |
221 | ret = device_register(&gadget->dev); |
222 | if (ret) | |
223 | goto err2; | |
f07bd56b | 224 | |
2ccea03a FB |
225 | device_initialize(&udc->dev); |
226 | udc->dev.release = usb_udc_release; | |
227 | udc->dev.class = udc_class; | |
019f976e | 228 | udc->dev.groups = usb_udc_attr_groups; |
2ccea03a FB |
229 | udc->dev.parent = parent; |
230 | ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); | |
231 | if (ret) | |
f07bd56b | 232 | goto err3; |
2ccea03a FB |
233 | |
234 | udc->gadget = gadget; | |
235 | ||
236 | mutex_lock(&udc_lock); | |
237 | list_add_tail(&udc->list, &udc_list); | |
238 | ||
239 | ret = device_add(&udc->dev); | |
240 | if (ret) | |
f07bd56b | 241 | goto err4; |
2ccea03a | 242 | |
49401f41 | 243 | usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); |
2ccea03a FB |
244 | |
245 | mutex_unlock(&udc_lock); | |
246 | ||
247 | return 0; | |
f07bd56b FB |
248 | |
249 | err4: | |
2ccea03a FB |
250 | list_del(&udc->list); |
251 | mutex_unlock(&udc_lock); | |
252 | ||
f07bd56b | 253 | err3: |
2ccea03a FB |
254 | put_device(&udc->dev); |
255 | ||
f07bd56b | 256 | err2: |
7bce401c | 257 | put_device(&gadget->dev); |
c5dbc220 | 258 | kfree(udc); |
7bce401c | 259 | |
2ccea03a FB |
260 | err1: |
261 | return ret; | |
262 | } | |
792bfcf7 FB |
263 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); |
264 | ||
265 | /** | |
266 | * usb_add_gadget_udc - adds a new gadget to the udc class driver list | |
267 | * @parent: the parent device to this udc. Usually the controller | |
268 | * driver's device. | |
269 | * @gadget: the gadget to be added to the list | |
270 | * | |
271 | * Returns zero on success, negative errno otherwise. | |
272 | */ | |
273 | int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget) | |
274 | { | |
275 | return usb_add_gadget_udc_release(parent, gadget, NULL); | |
276 | } | |
2ccea03a FB |
277 | EXPORT_SYMBOL_GPL(usb_add_gadget_udc); |
278 | ||
279 | static void usb_gadget_remove_driver(struct usb_udc *udc) | |
280 | { | |
281 | dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", | |
282 | udc->gadget->name); | |
283 | ||
284 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
285 | ||
2d7ebbb0 FB |
286 | usb_gadget_disconnect(udc->gadget); |
287 | udc->driver->disconnect(udc->gadget); | |
288 | udc->driver->unbind(udc->gadget); | |
511f3c53 | 289 | usb_gadget_udc_stop(udc->gadget, NULL); |
2ccea03a FB |
290 | |
291 | udc->driver = NULL; | |
292 | udc->dev.driver = NULL; | |
70d3a498 | 293 | udc->gadget->dev.driver = NULL; |
2ccea03a FB |
294 | } |
295 | ||
296 | /** | |
297 | * usb_del_gadget_udc - deletes @udc from udc_list | |
298 | * @gadget: the gadget to be removed. | |
299 | * | |
300 | * This, will call usb_gadget_unregister_driver() if | |
301 | * the @udc is still busy. | |
302 | */ | |
303 | void usb_del_gadget_udc(struct usb_gadget *gadget) | |
304 | { | |
305 | struct usb_udc *udc = NULL; | |
306 | ||
307 | mutex_lock(&udc_lock); | |
308 | list_for_each_entry(udc, &udc_list, list) | |
309 | if (udc->gadget == gadget) | |
310 | goto found; | |
311 | ||
312 | dev_err(gadget->dev.parent, "gadget not registered.\n"); | |
313 | mutex_unlock(&udc_lock); | |
314 | ||
315 | return; | |
316 | ||
317 | found: | |
318 | dev_vdbg(gadget->dev.parent, "unregistering gadget\n"); | |
319 | ||
320 | list_del(&udc->list); | |
321 | mutex_unlock(&udc_lock); | |
322 | ||
323 | if (udc->driver) | |
324 | usb_gadget_remove_driver(udc); | |
325 | ||
326 | kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); | |
5702f753 | 327 | flush_work(&gadget->work); |
2ccea03a | 328 | device_unregister(&udc->dev); |
7bce401c | 329 | device_unregister(&gadget->dev); |
2ccea03a FB |
330 | } |
331 | EXPORT_SYMBOL_GPL(usb_del_gadget_udc); | |
332 | ||
333 | /* ------------------------------------------------------------------------- */ | |
334 | ||
4c49a5f0 | 335 | static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) |
2ccea03a | 336 | { |
4c49a5f0 | 337 | int ret; |
2ccea03a | 338 | |
2ccea03a FB |
339 | dev_dbg(&udc->dev, "registering UDC driver [%s]\n", |
340 | driver->function); | |
341 | ||
342 | udc->driver = driver; | |
343 | udc->dev.driver = &driver->driver; | |
70d3a498 | 344 | udc->gadget->dev.driver = &driver->driver; |
2ccea03a | 345 | |
2d7ebbb0 FB |
346 | ret = driver->bind(udc->gadget, driver); |
347 | if (ret) | |
348 | goto err1; | |
349 | ret = usb_gadget_udc_start(udc->gadget, driver); | |
350 | if (ret) { | |
351 | driver->unbind(udc->gadget); | |
352 | goto err1; | |
352c2dc8 | 353 | } |
2d7ebbb0 | 354 | usb_gadget_connect(udc->gadget); |
2ccea03a FB |
355 | |
356 | kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); | |
2ccea03a | 357 | return 0; |
2ccea03a | 358 | err1: |
f8cffc84 FE |
359 | if (ret != -EISNAM) |
360 | dev_err(&udc->dev, "failed to start %s: %d\n", | |
2ccea03a FB |
361 | udc->driver->function, ret); |
362 | udc->driver = NULL; | |
363 | udc->dev.driver = NULL; | |
70d3a498 | 364 | udc->gadget->dev.driver = NULL; |
4c49a5f0 SAS |
365 | return ret; |
366 | } | |
367 | ||
368 | int udc_attach_driver(const char *name, struct usb_gadget_driver *driver) | |
369 | { | |
370 | struct usb_udc *udc = NULL; | |
371 | int ret = -ENODEV; | |
372 | ||
373 | mutex_lock(&udc_lock); | |
374 | list_for_each_entry(udc, &udc_list, list) { | |
375 | ret = strcmp(name, dev_name(&udc->dev)); | |
376 | if (!ret) | |
377 | break; | |
378 | } | |
379 | if (ret) { | |
380 | ret = -ENODEV; | |
381 | goto out; | |
382 | } | |
383 | if (udc->driver) { | |
384 | ret = -EBUSY; | |
385 | goto out; | |
386 | } | |
387 | ret = udc_bind_to_driver(udc, driver); | |
388 | out: | |
389 | mutex_unlock(&udc_lock); | |
390 | return ret; | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(udc_attach_driver); | |
393 | ||
394 | int usb_gadget_probe_driver(struct usb_gadget_driver *driver) | |
395 | { | |
396 | struct usb_udc *udc = NULL; | |
397 | int ret; | |
398 | ||
399 | if (!driver || !driver->bind || !driver->setup) | |
400 | return -EINVAL; | |
401 | ||
402 | mutex_lock(&udc_lock); | |
403 | list_for_each_entry(udc, &udc_list, list) { | |
404 | /* For now we take the first one */ | |
405 | if (!udc->driver) | |
406 | goto found; | |
407 | } | |
408 | ||
409 | pr_debug("couldn't find an available UDC\n"); | |
410 | mutex_unlock(&udc_lock); | |
411 | return -ENODEV; | |
412 | found: | |
413 | ret = udc_bind_to_driver(udc, driver); | |
2ccea03a FB |
414 | mutex_unlock(&udc_lock); |
415 | return ret; | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(usb_gadget_probe_driver); | |
418 | ||
419 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
420 | { | |
421 | struct usb_udc *udc = NULL; | |
422 | int ret = -ENODEV; | |
423 | ||
424 | if (!driver || !driver->unbind) | |
425 | return -EINVAL; | |
426 | ||
427 | mutex_lock(&udc_lock); | |
428 | list_for_each_entry(udc, &udc_list, list) | |
429 | if (udc->driver == driver) { | |
430 | usb_gadget_remove_driver(udc); | |
b5fb8d0a PC |
431 | usb_gadget_set_state(udc->gadget, |
432 | USB_STATE_NOTATTACHED); | |
2ccea03a FB |
433 | ret = 0; |
434 | break; | |
435 | } | |
436 | ||
437 | mutex_unlock(&udc_lock); | |
438 | return ret; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver); | |
441 | ||
442 | /* ------------------------------------------------------------------------- */ | |
443 | ||
444 | static ssize_t usb_udc_srp_store(struct device *dev, | |
445 | struct device_attribute *attr, const char *buf, size_t n) | |
446 | { | |
1d91a962 | 447 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
448 | |
449 | if (sysfs_streq(buf, "1")) | |
450 | usb_gadget_wakeup(udc->gadget); | |
451 | ||
452 | return n; | |
453 | } | |
454 | static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store); | |
455 | ||
456 | static ssize_t usb_udc_softconn_store(struct device *dev, | |
457 | struct device_attribute *attr, const char *buf, size_t n) | |
458 | { | |
865569ba | 459 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); |
2ccea03a FB |
460 | |
461 | if (sysfs_streq(buf, "connect")) { | |
2d7ebbb0 | 462 | usb_gadget_udc_start(udc->gadget, udc->driver); |
2ccea03a FB |
463 | usb_gadget_connect(udc->gadget); |
464 | } else if (sysfs_streq(buf, "disconnect")) { | |
83a787a7 | 465 | usb_gadget_disconnect(udc->gadget); |
2d7ebbb0 | 466 | usb_gadget_udc_stop(udc->gadget, udc->driver); |
2ccea03a FB |
467 | } else { |
468 | dev_err(dev, "unsupported command '%s'\n", buf); | |
469 | return -EINVAL; | |
470 | } | |
471 | ||
472 | return n; | |
473 | } | |
474 | static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store); | |
475 | ||
ce26bd23 GKH |
476 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
477 | char *buf) | |
49401f41 FB |
478 | { |
479 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
480 | struct usb_gadget *gadget = udc->gadget; | |
481 | ||
482 | return sprintf(buf, "%s\n", usb_state_string(gadget->state)); | |
483 | } | |
ce26bd23 | 484 | static DEVICE_ATTR_RO(state); |
49401f41 | 485 | |
d327ab5b | 486 | #define USB_UDC_SPEED_ATTR(name, param) \ |
ce26bd23 | 487 | ssize_t name##_show(struct device *dev, \ |
d327ab5b MN |
488 | struct device_attribute *attr, char *buf) \ |
489 | { \ | |
490 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ | |
491 | return snprintf(buf, PAGE_SIZE, "%s\n", \ | |
492 | usb_speed_string(udc->gadget->param)); \ | |
493 | } \ | |
ce26bd23 | 494 | static DEVICE_ATTR_RO(name) |
d327ab5b MN |
495 | |
496 | static USB_UDC_SPEED_ATTR(current_speed, speed); | |
497 | static USB_UDC_SPEED_ATTR(maximum_speed, max_speed); | |
498 | ||
2ccea03a | 499 | #define USB_UDC_ATTR(name) \ |
ce26bd23 | 500 | ssize_t name##_show(struct device *dev, \ |
2ccea03a FB |
501 | struct device_attribute *attr, char *buf) \ |
502 | { \ | |
019f976e | 503 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \ |
2ccea03a FB |
504 | struct usb_gadget *gadget = udc->gadget; \ |
505 | \ | |
506 | return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \ | |
507 | } \ | |
ce26bd23 | 508 | static DEVICE_ATTR_RO(name) |
2ccea03a | 509 | |
2ccea03a FB |
510 | static USB_UDC_ATTR(is_otg); |
511 | static USB_UDC_ATTR(is_a_peripheral); | |
512 | static USB_UDC_ATTR(b_hnp_enable); | |
513 | static USB_UDC_ATTR(a_hnp_support); | |
514 | static USB_UDC_ATTR(a_alt_hnp_support); | |
515 | ||
516 | static struct attribute *usb_udc_attrs[] = { | |
517 | &dev_attr_srp.attr, | |
518 | &dev_attr_soft_connect.attr, | |
49401f41 | 519 | &dev_attr_state.attr, |
d327ab5b MN |
520 | &dev_attr_current_speed.attr, |
521 | &dev_attr_maximum_speed.attr, | |
2ccea03a | 522 | |
2ccea03a FB |
523 | &dev_attr_is_otg.attr, |
524 | &dev_attr_is_a_peripheral.attr, | |
525 | &dev_attr_b_hnp_enable.attr, | |
526 | &dev_attr_a_hnp_support.attr, | |
527 | &dev_attr_a_alt_hnp_support.attr, | |
528 | NULL, | |
529 | }; | |
530 | ||
531 | static const struct attribute_group usb_udc_attr_group = { | |
532 | .attrs = usb_udc_attrs, | |
533 | }; | |
534 | ||
535 | static const struct attribute_group *usb_udc_attr_groups[] = { | |
536 | &usb_udc_attr_group, | |
537 | NULL, | |
538 | }; | |
539 | ||
540 | static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) | |
541 | { | |
542 | struct usb_udc *udc = container_of(dev, struct usb_udc, dev); | |
543 | int ret; | |
544 | ||
545 | ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name); | |
546 | if (ret) { | |
547 | dev_err(dev, "failed to add uevent USB_UDC_NAME\n"); | |
548 | return ret; | |
549 | } | |
550 | ||
551 | if (udc->driver) { | |
552 | ret = add_uevent_var(env, "USB_UDC_DRIVER=%s", | |
553 | udc->driver->function); | |
554 | if (ret) { | |
555 | dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n"); | |
556 | return ret; | |
557 | } | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static int __init usb_udc_init(void) | |
564 | { | |
565 | udc_class = class_create(THIS_MODULE, "udc"); | |
566 | if (IS_ERR(udc_class)) { | |
567 | pr_err("failed to create udc class --> %ld\n", | |
568 | PTR_ERR(udc_class)); | |
569 | return PTR_ERR(udc_class); | |
570 | } | |
571 | ||
572 | udc_class->dev_uevent = usb_udc_uevent; | |
2ccea03a FB |
573 | return 0; |
574 | } | |
575 | subsys_initcall(usb_udc_init); | |
576 | ||
577 | static void __exit usb_udc_exit(void) | |
578 | { | |
579 | class_destroy(udc_class); | |
580 | } | |
581 | module_exit(usb_udc_exit); | |
582 | ||
583 | MODULE_DESCRIPTION("UDC Framework"); | |
584 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); | |
585 | MODULE_LICENSE("GPL v2"); |