Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * firmware_class.c - Multi purpose firmware loading support | |
3 | * | |
4 | * Copyright (c) 2003 Manuel Estrada Sainz <ranty@debian.org> | |
5 | * | |
6 | * Please see Documentation/firmware_class/ for more information. | |
7 | * | |
8 | */ | |
9 | ||
10 | #include <linux/device.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/bitops.h> | |
17 | #include <asm/semaphore.h> | |
18 | ||
19 | #include <linux/firmware.h> | |
20 | #include "base.h" | |
21 | ||
22 | MODULE_AUTHOR("Manuel Estrada Sainz <ranty@debian.org>"); | |
23 | MODULE_DESCRIPTION("Multi purpose firmware loading support"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
26 | enum { | |
27 | FW_STATUS_LOADING, | |
28 | FW_STATUS_DONE, | |
29 | FW_STATUS_ABORT, | |
30 | FW_STATUS_READY, | |
6e3eaab0 | 31 | FW_STATUS_READY_NOHOTPLUG, |
1da177e4 LT |
32 | }; |
33 | ||
34 | static int loading_timeout = 10; /* In seconds */ | |
35 | ||
36 | /* fw_lock could be moved to 'struct firmware_priv' but since it is just | |
37 | * guarding for corner cases a global lock should be OK */ | |
38 | static DECLARE_MUTEX(fw_lock); | |
39 | ||
40 | struct firmware_priv { | |
41 | char fw_id[FIRMWARE_NAME_MAX]; | |
42 | struct completion completion; | |
43 | struct bin_attribute attr_data; | |
44 | struct firmware *fw; | |
45 | unsigned long status; | |
46 | int alloc_size; | |
47 | struct timer_list timeout; | |
48 | }; | |
49 | ||
50 | static inline void | |
51 | fw_load_abort(struct firmware_priv *fw_priv) | |
52 | { | |
53 | set_bit(FW_STATUS_ABORT, &fw_priv->status); | |
54 | wmb(); | |
55 | complete(&fw_priv->completion); | |
56 | } | |
57 | ||
58 | static ssize_t | |
59 | firmware_timeout_show(struct class *class, char *buf) | |
60 | { | |
61 | return sprintf(buf, "%d\n", loading_timeout); | |
62 | } | |
63 | ||
64 | /** | |
eb8e3179 RD |
65 | * firmware_timeout_store - set number of seconds to wait for firmware |
66 | * @class: device class pointer | |
67 | * @buf: buffer to scan for timeout value | |
68 | * @count: number of bytes in @buf | |
69 | * | |
1da177e4 | 70 | * Sets the number of seconds to wait for the firmware. Once |
eb8e3179 | 71 | * this expires an error will be returned to the driver and no |
1da177e4 LT |
72 | * firmware will be provided. |
73 | * | |
eb8e3179 | 74 | * Note: zero means 'wait forever'. |
1da177e4 LT |
75 | **/ |
76 | static ssize_t | |
77 | firmware_timeout_store(struct class *class, const char *buf, size_t count) | |
78 | { | |
79 | loading_timeout = simple_strtol(buf, NULL, 10); | |
b92eac01 SG |
80 | if (loading_timeout < 0) |
81 | loading_timeout = 0; | |
1da177e4 LT |
82 | return count; |
83 | } | |
84 | ||
85 | static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store); | |
86 | ||
87 | static void fw_class_dev_release(struct class_device *class_dev); | |
312c004d | 88 | int firmware_class_uevent(struct class_device *dev, char **envp, |
1da177e4 LT |
89 | int num_envp, char *buffer, int buffer_size); |
90 | ||
91 | static struct class firmware_class = { | |
92 | .name = "firmware", | |
312c004d | 93 | .uevent = firmware_class_uevent, |
1da177e4 LT |
94 | .release = fw_class_dev_release, |
95 | }; | |
96 | ||
97 | int | |
312c004d | 98 | firmware_class_uevent(struct class_device *class_dev, char **envp, |
1da177e4 LT |
99 | int num_envp, char *buffer, int buffer_size) |
100 | { | |
101 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
102 | int i = 0, len = 0; | |
103 | ||
104 | if (!test_bit(FW_STATUS_READY, &fw_priv->status)) | |
105 | return -ENODEV; | |
106 | ||
312c004d KS |
107 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
108 | "FIRMWARE=%s", fw_priv->fw_id)) | |
1da177e4 | 109 | return -ENOMEM; |
312c004d KS |
110 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
111 | "TIMEOUT=%i", loading_timeout)) | |
6897089c | 112 | return -ENOMEM; |
1da177e4 LT |
113 | envp[i] = NULL; |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static ssize_t | |
119 | firmware_loading_show(struct class_device *class_dev, char *buf) | |
120 | { | |
121 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
122 | int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); | |
123 | return sprintf(buf, "%d\n", loading); | |
124 | } | |
125 | ||
126 | /** | |
eb8e3179 RD |
127 | * firmware_loading_store - set value in the 'loading' control file |
128 | * @class_dev: class_device pointer | |
129 | * @buf: buffer to scan for loading control value | |
130 | * @count: number of bytes in @buf | |
131 | * | |
1da177e4 LT |
132 | * The relevant values are: |
133 | * | |
134 | * 1: Start a load, discarding any previous partial load. | |
eb8e3179 | 135 | * 0: Conclude the load and hand the data to the driver code. |
1da177e4 LT |
136 | * -1: Conclude the load with an error and discard any written data. |
137 | **/ | |
138 | static ssize_t | |
139 | firmware_loading_store(struct class_device *class_dev, | |
140 | const char *buf, size_t count) | |
141 | { | |
142 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
143 | int loading = simple_strtol(buf, NULL, 10); | |
144 | ||
145 | switch (loading) { | |
146 | case 1: | |
147 | down(&fw_lock); | |
b92eac01 SG |
148 | if (!fw_priv->fw) { |
149 | up(&fw_lock); | |
150 | break; | |
151 | } | |
1da177e4 LT |
152 | vfree(fw_priv->fw->data); |
153 | fw_priv->fw->data = NULL; | |
154 | fw_priv->fw->size = 0; | |
155 | fw_priv->alloc_size = 0; | |
156 | set_bit(FW_STATUS_LOADING, &fw_priv->status); | |
157 | up(&fw_lock); | |
158 | break; | |
159 | case 0: | |
160 | if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) { | |
161 | complete(&fw_priv->completion); | |
162 | clear_bit(FW_STATUS_LOADING, &fw_priv->status); | |
163 | break; | |
164 | } | |
165 | /* fallthrough */ | |
166 | default: | |
167 | printk(KERN_ERR "%s: unexpected value (%d)\n", __FUNCTION__, | |
168 | loading); | |
169 | /* fallthrough */ | |
170 | case -1: | |
171 | fw_load_abort(fw_priv); | |
172 | break; | |
173 | } | |
174 | ||
175 | return count; | |
176 | } | |
177 | ||
178 | static CLASS_DEVICE_ATTR(loading, 0644, | |
179 | firmware_loading_show, firmware_loading_store); | |
180 | ||
181 | static ssize_t | |
182 | firmware_data_read(struct kobject *kobj, | |
183 | char *buffer, loff_t offset, size_t count) | |
184 | { | |
185 | struct class_device *class_dev = to_class_dev(kobj); | |
186 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
187 | struct firmware *fw; | |
188 | ssize_t ret_count = count; | |
189 | ||
190 | down(&fw_lock); | |
191 | fw = fw_priv->fw; | |
b92eac01 | 192 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
193 | ret_count = -ENODEV; |
194 | goto out; | |
195 | } | |
196 | if (offset > fw->size) { | |
197 | ret_count = 0; | |
198 | goto out; | |
199 | } | |
200 | if (offset + ret_count > fw->size) | |
201 | ret_count = fw->size - offset; | |
202 | ||
203 | memcpy(buffer, fw->data + offset, ret_count); | |
204 | out: | |
205 | up(&fw_lock); | |
206 | return ret_count; | |
207 | } | |
eb8e3179 | 208 | |
1da177e4 LT |
209 | static int |
210 | fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) | |
211 | { | |
212 | u8 *new_data; | |
213 | ||
214 | if (min_size <= fw_priv->alloc_size) | |
215 | return 0; | |
216 | ||
217 | new_data = vmalloc(fw_priv->alloc_size + PAGE_SIZE); | |
218 | if (!new_data) { | |
219 | printk(KERN_ERR "%s: unable to alloc buffer\n", __FUNCTION__); | |
220 | /* Make sure that we don't keep incomplete data */ | |
221 | fw_load_abort(fw_priv); | |
222 | return -ENOMEM; | |
223 | } | |
224 | fw_priv->alloc_size += PAGE_SIZE; | |
225 | if (fw_priv->fw->data) { | |
226 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
227 | vfree(fw_priv->fw->data); | |
228 | } | |
229 | fw_priv->fw->data = new_data; | |
230 | BUG_ON(min_size > fw_priv->alloc_size); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | /** | |
eb8e3179 RD |
235 | * firmware_data_write - write method for firmware |
236 | * @kobj: kobject for the class_device | |
237 | * @buffer: buffer being written | |
238 | * @offset: buffer offset for write in total data store area | |
239 | * @count: buffer size | |
1da177e4 | 240 | * |
eb8e3179 | 241 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
242 | * the driver as a firmware image. |
243 | **/ | |
244 | static ssize_t | |
245 | firmware_data_write(struct kobject *kobj, | |
246 | char *buffer, loff_t offset, size_t count) | |
247 | { | |
248 | struct class_device *class_dev = to_class_dev(kobj); | |
249 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
250 | struct firmware *fw; | |
251 | ssize_t retval; | |
252 | ||
253 | if (!capable(CAP_SYS_RAWIO)) | |
254 | return -EPERM; | |
b92eac01 | 255 | |
1da177e4 LT |
256 | down(&fw_lock); |
257 | fw = fw_priv->fw; | |
b92eac01 | 258 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
259 | retval = -ENODEV; |
260 | goto out; | |
261 | } | |
262 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
263 | if (retval) | |
264 | goto out; | |
265 | ||
266 | memcpy(fw->data + offset, buffer, count); | |
267 | ||
268 | fw->size = max_t(size_t, offset + count, fw->size); | |
269 | retval = count; | |
270 | out: | |
271 | up(&fw_lock); | |
272 | return retval; | |
273 | } | |
eb8e3179 | 274 | |
1da177e4 LT |
275 | static struct bin_attribute firmware_attr_data_tmpl = { |
276 | .attr = {.name = "data", .mode = 0644, .owner = THIS_MODULE}, | |
277 | .size = 0, | |
278 | .read = firmware_data_read, | |
279 | .write = firmware_data_write, | |
280 | }; | |
281 | ||
282 | static void | |
283 | fw_class_dev_release(struct class_device *class_dev) | |
284 | { | |
285 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
286 | ||
287 | kfree(fw_priv); | |
288 | kfree(class_dev); | |
289 | ||
290 | module_put(THIS_MODULE); | |
291 | } | |
292 | ||
293 | static void | |
294 | firmware_class_timeout(u_long data) | |
295 | { | |
296 | struct firmware_priv *fw_priv = (struct firmware_priv *) data; | |
297 | fw_load_abort(fw_priv); | |
298 | } | |
299 | ||
300 | static inline void | |
301 | fw_setup_class_device_id(struct class_device *class_dev, struct device *dev) | |
302 | { | |
303 | /* XXX warning we should watch out for name collisions */ | |
304 | strlcpy(class_dev->class_id, dev->bus_id, BUS_ID_SIZE); | |
305 | } | |
306 | ||
307 | static int | |
308 | fw_register_class_device(struct class_device **class_dev_p, | |
309 | const char *fw_name, struct device *device) | |
310 | { | |
311 | int retval; | |
4aed0644 | 312 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 313 | GFP_KERNEL); |
4aed0644 | 314 | struct class_device *class_dev = kzalloc(sizeof(*class_dev), |
1da177e4 LT |
315 | GFP_KERNEL); |
316 | ||
317 | *class_dev_p = NULL; | |
318 | ||
319 | if (!fw_priv || !class_dev) { | |
320 | printk(KERN_ERR "%s: kmalloc failed\n", __FUNCTION__); | |
321 | retval = -ENOMEM; | |
322 | goto error_kfree; | |
323 | } | |
1da177e4 LT |
324 | |
325 | init_completion(&fw_priv->completion); | |
326 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
327 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
328 | ||
329 | fw_priv->timeout.function = firmware_class_timeout; | |
330 | fw_priv->timeout.data = (u_long) fw_priv; | |
331 | init_timer(&fw_priv->timeout); | |
332 | ||
333 | fw_setup_class_device_id(class_dev, device); | |
334 | class_dev->dev = device; | |
335 | class_dev->class = &firmware_class; | |
336 | class_set_devdata(class_dev, fw_priv); | |
337 | retval = class_device_register(class_dev); | |
338 | if (retval) { | |
339 | printk(KERN_ERR "%s: class_device_register failed\n", | |
340 | __FUNCTION__); | |
341 | goto error_kfree; | |
342 | } | |
343 | *class_dev_p = class_dev; | |
344 | return 0; | |
345 | ||
346 | error_kfree: | |
347 | kfree(fw_priv); | |
348 | kfree(class_dev); | |
349 | return retval; | |
350 | } | |
351 | ||
352 | static int | |
353 | fw_setup_class_device(struct firmware *fw, struct class_device **class_dev_p, | |
312c004d | 354 | const char *fw_name, struct device *device, int uevent) |
1da177e4 LT |
355 | { |
356 | struct class_device *class_dev; | |
357 | struct firmware_priv *fw_priv; | |
358 | int retval; | |
359 | ||
360 | *class_dev_p = NULL; | |
361 | retval = fw_register_class_device(&class_dev, fw_name, device); | |
362 | if (retval) | |
363 | goto out; | |
364 | ||
365 | /* Need to pin this module until class device is destroyed */ | |
366 | __module_get(THIS_MODULE); | |
367 | ||
368 | fw_priv = class_get_devdata(class_dev); | |
369 | ||
370 | fw_priv->fw = fw; | |
371 | retval = sysfs_create_bin_file(&class_dev->kobj, &fw_priv->attr_data); | |
372 | if (retval) { | |
373 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", | |
374 | __FUNCTION__); | |
375 | goto error_unreg; | |
376 | } | |
377 | ||
378 | retval = class_device_create_file(class_dev, | |
379 | &class_device_attr_loading); | |
380 | if (retval) { | |
381 | printk(KERN_ERR "%s: class_device_create_file failed\n", | |
382 | __FUNCTION__); | |
383 | goto error_unreg; | |
384 | } | |
385 | ||
312c004d | 386 | if (uevent) |
6e3eaab0 AS |
387 | set_bit(FW_STATUS_READY, &fw_priv->status); |
388 | else | |
389 | set_bit(FW_STATUS_READY_NOHOTPLUG, &fw_priv->status); | |
1da177e4 LT |
390 | *class_dev_p = class_dev; |
391 | goto out; | |
392 | ||
393 | error_unreg: | |
394 | class_device_unregister(class_dev); | |
395 | out: | |
396 | return retval; | |
397 | } | |
398 | ||
6e3eaab0 AS |
399 | static int |
400 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 401 | struct device *device, int uevent) |
1da177e4 LT |
402 | { |
403 | struct class_device *class_dev; | |
404 | struct firmware_priv *fw_priv; | |
405 | struct firmware *firmware; | |
406 | int retval; | |
407 | ||
408 | if (!firmware_p) | |
409 | return -EINVAL; | |
410 | ||
4aed0644 | 411 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 LT |
412 | if (!firmware) { |
413 | printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n", | |
414 | __FUNCTION__); | |
415 | retval = -ENOMEM; | |
416 | goto out; | |
417 | } | |
1da177e4 | 418 | |
6e3eaab0 | 419 | retval = fw_setup_class_device(firmware, &class_dev, name, device, |
312c004d | 420 | uevent); |
1da177e4 LT |
421 | if (retval) |
422 | goto error_kfree_fw; | |
423 | ||
424 | fw_priv = class_get_devdata(class_dev); | |
425 | ||
312c004d | 426 | if (uevent) { |
6e3eaab0 AS |
427 | if (loading_timeout > 0) { |
428 | fw_priv->timeout.expires = jiffies + loading_timeout * HZ; | |
429 | add_timer(&fw_priv->timeout); | |
430 | } | |
1da177e4 | 431 | |
312c004d | 432 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
6e3eaab0 AS |
433 | wait_for_completion(&fw_priv->completion); |
434 | set_bit(FW_STATUS_DONE, &fw_priv->status); | |
435 | del_timer_sync(&fw_priv->timeout); | |
436 | } else | |
437 | wait_for_completion(&fw_priv->completion); | |
1da177e4 LT |
438 | |
439 | down(&fw_lock); | |
440 | if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) { | |
441 | retval = -ENOENT; | |
442 | release_firmware(fw_priv->fw); | |
443 | *firmware_p = NULL; | |
444 | } | |
445 | fw_priv->fw = NULL; | |
446 | up(&fw_lock); | |
447 | class_device_unregister(class_dev); | |
448 | goto out; | |
449 | ||
450 | error_kfree_fw: | |
451 | kfree(firmware); | |
452 | *firmware_p = NULL; | |
453 | out: | |
454 | return retval; | |
455 | } | |
456 | ||
6e3eaab0 | 457 | /** |
312c004d | 458 | * request_firmware: - send firmware request and wait for it |
eb8e3179 RD |
459 | * @firmware_p: pointer to firmware image |
460 | * @name: name of firmware file | |
461 | * @device: device for which firmware is being loaded | |
462 | * | |
463 | * @firmware_p will be used to return a firmware image by the name | |
6e3eaab0 AS |
464 | * of @name for device @device. |
465 | * | |
466 | * Should be called from user context where sleeping is allowed. | |
467 | * | |
312c004d | 468 | * @name will be used as $FIRMWARE in the uevent environment and |
6e3eaab0 AS |
469 | * should be distinctive enough not to be confused with any other |
470 | * firmware image for this or any other device. | |
471 | **/ | |
472 | int | |
473 | request_firmware(const struct firmware **firmware_p, const char *name, | |
474 | struct device *device) | |
475 | { | |
312c004d KS |
476 | int uevent = 1; |
477 | return _request_firmware(firmware_p, name, device, uevent); | |
6e3eaab0 AS |
478 | } |
479 | ||
1da177e4 LT |
480 | /** |
481 | * release_firmware: - release the resource associated with a firmware image | |
eb8e3179 | 482 | * @fw: firmware resource to release |
1da177e4 LT |
483 | **/ |
484 | void | |
485 | release_firmware(const struct firmware *fw) | |
486 | { | |
487 | if (fw) { | |
488 | vfree(fw->data); | |
489 | kfree(fw); | |
490 | } | |
491 | } | |
492 | ||
493 | /** | |
494 | * register_firmware: - provide a firmware image for later usage | |
eb8e3179 RD |
495 | * @name: name of firmware image file |
496 | * @data: buffer pointer for the firmware image | |
497 | * @size: size of the data buffer area | |
1da177e4 | 498 | * |
1da177e4 LT |
499 | * Make sure that @data will be available by requesting firmware @name. |
500 | * | |
501 | * Note: This will not be possible until some kind of persistence | |
502 | * is available. | |
503 | **/ | |
504 | void | |
505 | register_firmware(const char *name, const u8 *data, size_t size) | |
506 | { | |
507 | /* This is meaningless without firmware caching, so until we | |
508 | * decide if firmware caching is reasonable just leave it as a | |
509 | * noop */ | |
510 | } | |
511 | ||
512 | /* Async support */ | |
513 | struct firmware_work { | |
514 | struct work_struct work; | |
515 | struct module *module; | |
516 | const char *name; | |
517 | struct device *device; | |
518 | void *context; | |
519 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 520 | int uevent; |
1da177e4 LT |
521 | }; |
522 | ||
523 | static int | |
524 | request_firmware_work_func(void *arg) | |
525 | { | |
526 | struct firmware_work *fw_work = arg; | |
527 | const struct firmware *fw; | |
113fab13 | 528 | int ret; |
1da177e4 LT |
529 | if (!arg) { |
530 | WARN_ON(1); | |
531 | return 0; | |
532 | } | |
533 | daemonize("%s/%s", "firmware", fw_work->name); | |
113fab13 | 534 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 535 | fw_work->uevent); |
113fab13 | 536 | if (ret < 0) |
537 | fw_work->cont(NULL, fw_work->context); | |
538 | else { | |
539 | fw_work->cont(fw, fw_work->context); | |
540 | release_firmware(fw); | |
541 | } | |
1da177e4 LT |
542 | module_put(fw_work->module); |
543 | kfree(fw_work); | |
113fab13 | 544 | return ret; |
1da177e4 LT |
545 | } |
546 | ||
547 | /** | |
eb8e3179 RD |
548 | * request_firmware_nowait: asynchronous version of request_firmware |
549 | * @module: module requesting the firmware | |
312c004d | 550 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
551 | * is non-zero else the firmware copy must be done manually. |
552 | * @name: name of firmware file | |
553 | * @device: device for which firmware is being loaded | |
554 | * @context: will be passed over to @cont, and | |
555 | * @fw may be %NULL if firmware request fails. | |
556 | * @cont: function will be called asynchronously when the firmware | |
557 | * request is over. | |
1da177e4 | 558 | * |
1da177e4 LT |
559 | * Asynchronous variant of request_firmware() for contexts where |
560 | * it is not possible to sleep. | |
1da177e4 LT |
561 | **/ |
562 | int | |
563 | request_firmware_nowait( | |
312c004d | 564 | struct module *module, int uevent, |
1da177e4 LT |
565 | const char *name, struct device *device, void *context, |
566 | void (*cont)(const struct firmware *fw, void *context)) | |
567 | { | |
568 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), | |
569 | GFP_ATOMIC); | |
570 | int ret; | |
571 | ||
572 | if (!fw_work) | |
573 | return -ENOMEM; | |
574 | if (!try_module_get(module)) { | |
575 | kfree(fw_work); | |
576 | return -EFAULT; | |
577 | } | |
578 | ||
579 | *fw_work = (struct firmware_work) { | |
580 | .module = module, | |
581 | .name = name, | |
582 | .device = device, | |
583 | .context = context, | |
584 | .cont = cont, | |
312c004d | 585 | .uevent = uevent, |
1da177e4 LT |
586 | }; |
587 | ||
588 | ret = kernel_thread(request_firmware_work_func, fw_work, | |
589 | CLONE_FS | CLONE_FILES); | |
590 | ||
591 | if (ret < 0) { | |
592 | fw_work->cont(NULL, fw_work->context); | |
113fab13 | 593 | module_put(fw_work->module); |
594 | kfree(fw_work); | |
1da177e4 LT |
595 | return ret; |
596 | } | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static int __init | |
601 | firmware_class_init(void) | |
602 | { | |
603 | int error; | |
604 | error = class_register(&firmware_class); | |
605 | if (error) { | |
606 | printk(KERN_ERR "%s: class_register failed\n", __FUNCTION__); | |
607 | return error; | |
608 | } | |
609 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
610 | if (error) { | |
611 | printk(KERN_ERR "%s: class_create_file failed\n", | |
612 | __FUNCTION__); | |
613 | class_unregister(&firmware_class); | |
614 | } | |
615 | return error; | |
616 | ||
617 | } | |
618 | static void __exit | |
619 | firmware_class_exit(void) | |
620 | { | |
621 | class_unregister(&firmware_class); | |
622 | } | |
623 | ||
624 | module_init(firmware_class_init); | |
625 | module_exit(firmware_class_exit); | |
626 | ||
627 | EXPORT_SYMBOL(release_firmware); | |
628 | EXPORT_SYMBOL(request_firmware); | |
629 | EXPORT_SYMBOL(request_firmware_nowait); | |
630 | EXPORT_SYMBOL(register_firmware); |