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