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 | ||
c59ede7b | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/device.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/bitops.h> | |
cad1e55d | 18 | #include <linux/mutex.h> |
563d0757 | 19 | #include <linux/kthread.h> |
1da177e4 LT |
20 | |
21 | #include <linux/firmware.h> | |
22 | #include "base.h" | |
23 | ||
e55c8790 GKH |
24 | #define to_dev(obj) container_of(obj, struct device, kobj) |
25 | ||
1da177e4 LT |
26 | MODULE_AUTHOR("Manuel Estrada Sainz <ranty@debian.org>"); |
27 | MODULE_DESCRIPTION("Multi purpose firmware loading support"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
30 | enum { | |
31 | FW_STATUS_LOADING, | |
32 | FW_STATUS_DONE, | |
33 | FW_STATUS_ABORT, | |
34 | FW_STATUS_READY, | |
6e3eaab0 | 35 | FW_STATUS_READY_NOHOTPLUG, |
1da177e4 LT |
36 | }; |
37 | ||
38 | static int loading_timeout = 10; /* In seconds */ | |
39 | ||
40 | /* fw_lock could be moved to 'struct firmware_priv' but since it is just | |
41 | * guarding for corner cases a global lock should be OK */ | |
cad1e55d | 42 | static DEFINE_MUTEX(fw_lock); |
1da177e4 LT |
43 | |
44 | struct firmware_priv { | |
45 | char fw_id[FIRMWARE_NAME_MAX]; | |
46 | struct completion completion; | |
47 | struct bin_attribute attr_data; | |
48 | struct firmware *fw; | |
49 | unsigned long status; | |
50 | int alloc_size; | |
51 | struct timer_list timeout; | |
52 | }; | |
53 | ||
858119e1 | 54 | static void |
1da177e4 LT |
55 | fw_load_abort(struct firmware_priv *fw_priv) |
56 | { | |
57 | set_bit(FW_STATUS_ABORT, &fw_priv->status); | |
58 | wmb(); | |
59 | complete(&fw_priv->completion); | |
60 | } | |
61 | ||
62 | static ssize_t | |
63 | firmware_timeout_show(struct class *class, char *buf) | |
64 | { | |
65 | return sprintf(buf, "%d\n", loading_timeout); | |
66 | } | |
67 | ||
68 | /** | |
eb8e3179 RD |
69 | * firmware_timeout_store - set number of seconds to wait for firmware |
70 | * @class: device class pointer | |
71 | * @buf: buffer to scan for timeout value | |
72 | * @count: number of bytes in @buf | |
73 | * | |
1da177e4 | 74 | * Sets the number of seconds to wait for the firmware. Once |
eb8e3179 | 75 | * this expires an error will be returned to the driver and no |
1da177e4 LT |
76 | * firmware will be provided. |
77 | * | |
eb8e3179 | 78 | * Note: zero means 'wait forever'. |
1da177e4 LT |
79 | **/ |
80 | static ssize_t | |
81 | firmware_timeout_store(struct class *class, const char *buf, size_t count) | |
82 | { | |
83 | loading_timeout = simple_strtol(buf, NULL, 10); | |
b92eac01 SG |
84 | if (loading_timeout < 0) |
85 | loading_timeout = 0; | |
1da177e4 LT |
86 | return count; |
87 | } | |
88 | ||
89 | static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store); | |
90 | ||
e55c8790 | 91 | static void fw_dev_release(struct device *dev); |
1da177e4 | 92 | |
e55c8790 GKH |
93 | static int firmware_uevent(struct device *dev, char **envp, int num_envp, |
94 | char *buffer, int buffer_size) | |
1da177e4 | 95 | { |
e55c8790 | 96 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
97 | int i = 0, len = 0; |
98 | ||
99 | if (!test_bit(FW_STATUS_READY, &fw_priv->status)) | |
100 | return -ENODEV; | |
101 | ||
312c004d KS |
102 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
103 | "FIRMWARE=%s", fw_priv->fw_id)) | |
1da177e4 | 104 | return -ENOMEM; |
312c004d KS |
105 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
106 | "TIMEOUT=%i", loading_timeout)) | |
6897089c | 107 | return -ENOMEM; |
1da177e4 LT |
108 | envp[i] = NULL; |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
1b81d663 AB |
113 | static struct class firmware_class = { |
114 | .name = "firmware", | |
e55c8790 GKH |
115 | .dev_uevent = firmware_uevent, |
116 | .dev_release = fw_dev_release, | |
1b81d663 AB |
117 | }; |
118 | ||
e55c8790 GKH |
119 | static ssize_t firmware_loading_show(struct device *dev, |
120 | struct device_attribute *attr, char *buf) | |
1da177e4 | 121 | { |
e55c8790 | 122 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
123 | int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); |
124 | return sprintf(buf, "%d\n", loading); | |
125 | } | |
126 | ||
127 | /** | |
eb8e3179 | 128 | * firmware_loading_store - set value in the 'loading' control file |
e55c8790 | 129 | * @dev: device pointer |
eb8e3179 RD |
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 | **/ | |
e55c8790 GKH |
139 | static ssize_t firmware_loading_store(struct device *dev, |
140 | struct device_attribute *attr, | |
141 | const char *buf, size_t count) | |
1da177e4 | 142 | { |
e55c8790 | 143 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
144 | int loading = simple_strtol(buf, NULL, 10); |
145 | ||
146 | switch (loading) { | |
147 | case 1: | |
cad1e55d | 148 | mutex_lock(&fw_lock); |
b92eac01 | 149 | if (!fw_priv->fw) { |
cad1e55d | 150 | mutex_unlock(&fw_lock); |
b92eac01 SG |
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); | |
cad1e55d | 158 | mutex_unlock(&fw_lock); |
1da177e4 LT |
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 | ||
e55c8790 | 179 | static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store); |
1da177e4 LT |
180 | |
181 | static ssize_t | |
182 | firmware_data_read(struct kobject *kobj, | |
183 | char *buffer, loff_t offset, size_t count) | |
184 | { | |
e55c8790 GKH |
185 | struct device *dev = to_dev(kobj); |
186 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
187 | struct firmware *fw; |
188 | ssize_t ret_count = count; | |
189 | ||
cad1e55d | 190 | mutex_lock(&fw_lock); |
1da177e4 | 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: | |
cad1e55d | 205 | mutex_unlock(&fw_lock); |
1da177e4 LT |
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; | |
30560ba6 | 213 | int new_size = fw_priv->alloc_size; |
1da177e4 LT |
214 | |
215 | if (min_size <= fw_priv->alloc_size) | |
216 | return 0; | |
217 | ||
30560ba6 JM |
218 | new_size = ALIGN(min_size, PAGE_SIZE); |
219 | new_data = vmalloc(new_size); | |
1da177e4 LT |
220 | if (!new_data) { |
221 | printk(KERN_ERR "%s: unable to alloc buffer\n", __FUNCTION__); | |
222 | /* Make sure that we don't keep incomplete data */ | |
223 | fw_load_abort(fw_priv); | |
224 | return -ENOMEM; | |
225 | } | |
30560ba6 | 226 | fw_priv->alloc_size = new_size; |
1da177e4 LT |
227 | if (fw_priv->fw->data) { |
228 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
229 | vfree(fw_priv->fw->data); | |
230 | } | |
231 | fw_priv->fw->data = new_data; | |
232 | BUG_ON(min_size > fw_priv->alloc_size); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /** | |
eb8e3179 | 237 | * firmware_data_write - write method for firmware |
e55c8790 | 238 | * @kobj: kobject for the device |
eb8e3179 RD |
239 | * @buffer: buffer being written |
240 | * @offset: buffer offset for write in total data store area | |
241 | * @count: buffer size | |
1da177e4 | 242 | * |
eb8e3179 | 243 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
244 | * the driver as a firmware image. |
245 | **/ | |
246 | static ssize_t | |
247 | firmware_data_write(struct kobject *kobj, | |
248 | char *buffer, loff_t offset, size_t count) | |
249 | { | |
e55c8790 GKH |
250 | struct device *dev = to_dev(kobj); |
251 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
252 | struct firmware *fw; |
253 | ssize_t retval; | |
254 | ||
255 | if (!capable(CAP_SYS_RAWIO)) | |
256 | return -EPERM; | |
b92eac01 | 257 | |
cad1e55d | 258 | mutex_lock(&fw_lock); |
1da177e4 | 259 | fw = fw_priv->fw; |
b92eac01 | 260 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
261 | retval = -ENODEV; |
262 | goto out; | |
263 | } | |
264 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
265 | if (retval) | |
266 | goto out; | |
267 | ||
268 | memcpy(fw->data + offset, buffer, count); | |
269 | ||
270 | fw->size = max_t(size_t, offset + count, fw->size); | |
271 | retval = count; | |
272 | out: | |
cad1e55d | 273 | mutex_unlock(&fw_lock); |
1da177e4 LT |
274 | return retval; |
275 | } | |
eb8e3179 | 276 | |
1da177e4 LT |
277 | static struct bin_attribute firmware_attr_data_tmpl = { |
278 | .attr = {.name = "data", .mode = 0644, .owner = THIS_MODULE}, | |
279 | .size = 0, | |
280 | .read = firmware_data_read, | |
281 | .write = firmware_data_write, | |
282 | }; | |
283 | ||
e55c8790 | 284 | static void fw_dev_release(struct device *dev) |
1da177e4 | 285 | { |
e55c8790 | 286 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
287 | |
288 | kfree(fw_priv); | |
e55c8790 | 289 | kfree(dev); |
1da177e4 LT |
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 | ||
e55c8790 | 301 | static inline void fw_setup_device_id(struct device *f_dev, struct device *dev) |
1da177e4 LT |
302 | { |
303 | /* XXX warning we should watch out for name collisions */ | |
e55c8790 | 304 | strlcpy(f_dev->bus_id, dev->bus_id, BUS_ID_SIZE); |
1da177e4 LT |
305 | } |
306 | ||
e55c8790 GKH |
307 | static int fw_register_device(struct device **dev_p, const char *fw_name, |
308 | struct device *device) | |
1da177e4 LT |
309 | { |
310 | int retval; | |
4aed0644 | 311 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 312 | GFP_KERNEL); |
e55c8790 | 313 | struct device *f_dev = kzalloc(sizeof(*f_dev), GFP_KERNEL); |
1da177e4 | 314 | |
e55c8790 | 315 | *dev_p = NULL; |
1da177e4 | 316 | |
e55c8790 | 317 | if (!fw_priv || !f_dev) { |
1da177e4 LT |
318 | printk(KERN_ERR "%s: kmalloc failed\n", __FUNCTION__); |
319 | retval = -ENOMEM; | |
320 | goto error_kfree; | |
321 | } | |
1da177e4 LT |
322 | |
323 | init_completion(&fw_priv->completion); | |
324 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
325 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
326 | ||
327 | fw_priv->timeout.function = firmware_class_timeout; | |
328 | fw_priv->timeout.data = (u_long) fw_priv; | |
329 | init_timer(&fw_priv->timeout); | |
330 | ||
e55c8790 GKH |
331 | fw_setup_device_id(f_dev, device); |
332 | f_dev->parent = device; | |
333 | f_dev->class = &firmware_class; | |
334 | dev_set_drvdata(f_dev, fw_priv); | |
335 | retval = device_register(f_dev); | |
1da177e4 | 336 | if (retval) { |
e55c8790 | 337 | printk(KERN_ERR "%s: device_register failed\n", |
1da177e4 LT |
338 | __FUNCTION__); |
339 | goto error_kfree; | |
340 | } | |
e55c8790 | 341 | *dev_p = f_dev; |
1da177e4 LT |
342 | return 0; |
343 | ||
344 | error_kfree: | |
345 | kfree(fw_priv); | |
e55c8790 | 346 | kfree(f_dev); |
1da177e4 LT |
347 | return retval; |
348 | } | |
349 | ||
e55c8790 GKH |
350 | static int fw_setup_device(struct firmware *fw, struct device **dev_p, |
351 | const char *fw_name, struct device *device, | |
352 | int uevent) | |
1da177e4 | 353 | { |
e55c8790 | 354 | struct device *f_dev; |
1da177e4 LT |
355 | struct firmware_priv *fw_priv; |
356 | int retval; | |
357 | ||
e55c8790 GKH |
358 | *dev_p = NULL; |
359 | retval = fw_register_device(&f_dev, fw_name, device); | |
1da177e4 LT |
360 | if (retval) |
361 | goto out; | |
362 | ||
363 | /* Need to pin this module until class device is destroyed */ | |
364 | __module_get(THIS_MODULE); | |
365 | ||
e55c8790 | 366 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 LT |
367 | |
368 | fw_priv->fw = fw; | |
e55c8790 | 369 | retval = sysfs_create_bin_file(&f_dev->kobj, &fw_priv->attr_data); |
1da177e4 LT |
370 | if (retval) { |
371 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", | |
372 | __FUNCTION__); | |
373 | goto error_unreg; | |
374 | } | |
375 | ||
e55c8790 | 376 | retval = device_create_file(f_dev, &dev_attr_loading); |
1da177e4 | 377 | if (retval) { |
e55c8790 | 378 | printk(KERN_ERR "%s: device_create_file failed\n", |
1da177e4 LT |
379 | __FUNCTION__); |
380 | goto error_unreg; | |
381 | } | |
382 | ||
312c004d | 383 | if (uevent) |
6e3eaab0 AS |
384 | set_bit(FW_STATUS_READY, &fw_priv->status); |
385 | else | |
386 | set_bit(FW_STATUS_READY_NOHOTPLUG, &fw_priv->status); | |
e55c8790 | 387 | *dev_p = f_dev; |
1da177e4 LT |
388 | goto out; |
389 | ||
390 | error_unreg: | |
e55c8790 | 391 | device_unregister(f_dev); |
1da177e4 LT |
392 | out: |
393 | return retval; | |
394 | } | |
395 | ||
6e3eaab0 AS |
396 | static int |
397 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 398 | struct device *device, int uevent) |
1da177e4 | 399 | { |
e55c8790 | 400 | struct device *f_dev; |
1da177e4 LT |
401 | struct firmware_priv *fw_priv; |
402 | struct firmware *firmware; | |
403 | int retval; | |
404 | ||
405 | if (!firmware_p) | |
406 | return -EINVAL; | |
407 | ||
4aed0644 | 408 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 LT |
409 | if (!firmware) { |
410 | printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n", | |
411 | __FUNCTION__); | |
412 | retval = -ENOMEM; | |
413 | goto out; | |
414 | } | |
1da177e4 | 415 | |
e55c8790 | 416 | retval = fw_setup_device(firmware, &f_dev, name, device, uevent); |
1da177e4 LT |
417 | if (retval) |
418 | goto error_kfree_fw; | |
419 | ||
e55c8790 | 420 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 | 421 | |
312c004d | 422 | if (uevent) { |
6e3eaab0 AS |
423 | if (loading_timeout > 0) { |
424 | fw_priv->timeout.expires = jiffies + loading_timeout * HZ; | |
425 | add_timer(&fw_priv->timeout); | |
426 | } | |
1da177e4 | 427 | |
e55c8790 | 428 | kobject_uevent(&f_dev->kobj, KOBJ_ADD); |
6e3eaab0 AS |
429 | wait_for_completion(&fw_priv->completion); |
430 | set_bit(FW_STATUS_DONE, &fw_priv->status); | |
431 | del_timer_sync(&fw_priv->timeout); | |
432 | } else | |
433 | wait_for_completion(&fw_priv->completion); | |
1da177e4 | 434 | |
cad1e55d | 435 | mutex_lock(&fw_lock); |
1da177e4 LT |
436 | if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) { |
437 | retval = -ENOENT; | |
438 | release_firmware(fw_priv->fw); | |
439 | *firmware_p = NULL; | |
440 | } | |
441 | fw_priv->fw = NULL; | |
cad1e55d | 442 | mutex_unlock(&fw_lock); |
e55c8790 | 443 | device_unregister(f_dev); |
1da177e4 LT |
444 | goto out; |
445 | ||
446 | error_kfree_fw: | |
447 | kfree(firmware); | |
448 | *firmware_p = NULL; | |
449 | out: | |
450 | return retval; | |
451 | } | |
452 | ||
6e3eaab0 | 453 | /** |
312c004d | 454 | * request_firmware: - send firmware request and wait for it |
eb8e3179 RD |
455 | * @firmware_p: pointer to firmware image |
456 | * @name: name of firmware file | |
457 | * @device: device for which firmware is being loaded | |
458 | * | |
459 | * @firmware_p will be used to return a firmware image by the name | |
6e3eaab0 AS |
460 | * of @name for device @device. |
461 | * | |
462 | * Should be called from user context where sleeping is allowed. | |
463 | * | |
312c004d | 464 | * @name will be used as $FIRMWARE in the uevent environment and |
6e3eaab0 AS |
465 | * should be distinctive enough not to be confused with any other |
466 | * firmware image for this or any other device. | |
467 | **/ | |
468 | int | |
469 | request_firmware(const struct firmware **firmware_p, const char *name, | |
470 | struct device *device) | |
471 | { | |
312c004d KS |
472 | int uevent = 1; |
473 | return _request_firmware(firmware_p, name, device, uevent); | |
6e3eaab0 AS |
474 | } |
475 | ||
1da177e4 LT |
476 | /** |
477 | * release_firmware: - release the resource associated with a firmware image | |
eb8e3179 | 478 | * @fw: firmware resource to release |
1da177e4 LT |
479 | **/ |
480 | void | |
481 | release_firmware(const struct firmware *fw) | |
482 | { | |
483 | if (fw) { | |
484 | vfree(fw->data); | |
485 | kfree(fw); | |
486 | } | |
487 | } | |
488 | ||
1da177e4 LT |
489 | /* Async support */ |
490 | struct firmware_work { | |
491 | struct work_struct work; | |
492 | struct module *module; | |
493 | const char *name; | |
494 | struct device *device; | |
495 | void *context; | |
496 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 497 | int uevent; |
1da177e4 LT |
498 | }; |
499 | ||
500 | static int | |
501 | request_firmware_work_func(void *arg) | |
502 | { | |
503 | struct firmware_work *fw_work = arg; | |
504 | const struct firmware *fw; | |
113fab13 | 505 | int ret; |
1da177e4 LT |
506 | if (!arg) { |
507 | WARN_ON(1); | |
508 | return 0; | |
509 | } | |
113fab13 | 510 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 511 | fw_work->uevent); |
113fab13 MC |
512 | if (ret < 0) |
513 | fw_work->cont(NULL, fw_work->context); | |
514 | else { | |
515 | fw_work->cont(fw, fw_work->context); | |
516 | release_firmware(fw); | |
517 | } | |
1da177e4 LT |
518 | module_put(fw_work->module); |
519 | kfree(fw_work); | |
113fab13 | 520 | return ret; |
1da177e4 LT |
521 | } |
522 | ||
523 | /** | |
eb8e3179 RD |
524 | * request_firmware_nowait: asynchronous version of request_firmware |
525 | * @module: module requesting the firmware | |
312c004d | 526 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
527 | * is non-zero else the firmware copy must be done manually. |
528 | * @name: name of firmware file | |
529 | * @device: device for which firmware is being loaded | |
530 | * @context: will be passed over to @cont, and | |
531 | * @fw may be %NULL if firmware request fails. | |
532 | * @cont: function will be called asynchronously when the firmware | |
533 | * request is over. | |
1da177e4 | 534 | * |
1da177e4 LT |
535 | * Asynchronous variant of request_firmware() for contexts where |
536 | * it is not possible to sleep. | |
1da177e4 LT |
537 | **/ |
538 | int | |
539 | request_firmware_nowait( | |
312c004d | 540 | struct module *module, int uevent, |
1da177e4 LT |
541 | const char *name, struct device *device, void *context, |
542 | void (*cont)(const struct firmware *fw, void *context)) | |
543 | { | |
563d0757 | 544 | struct task_struct *task; |
1da177e4 LT |
545 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), |
546 | GFP_ATOMIC); | |
1da177e4 LT |
547 | |
548 | if (!fw_work) | |
549 | return -ENOMEM; | |
550 | if (!try_module_get(module)) { | |
551 | kfree(fw_work); | |
552 | return -EFAULT; | |
553 | } | |
554 | ||
555 | *fw_work = (struct firmware_work) { | |
556 | .module = module, | |
557 | .name = name, | |
558 | .device = device, | |
559 | .context = context, | |
560 | .cont = cont, | |
312c004d | 561 | .uevent = uevent, |
1da177e4 LT |
562 | }; |
563 | ||
563d0757 SB |
564 | task = kthread_run(request_firmware_work_func, fw_work, |
565 | "firmware/%s", name); | |
1da177e4 | 566 | |
563d0757 | 567 | if (IS_ERR(task)) { |
1da177e4 | 568 | fw_work->cont(NULL, fw_work->context); |
113fab13 MC |
569 | module_put(fw_work->module); |
570 | kfree(fw_work); | |
563d0757 | 571 | return PTR_ERR(task); |
1da177e4 LT |
572 | } |
573 | return 0; | |
574 | } | |
575 | ||
576 | static int __init | |
577 | firmware_class_init(void) | |
578 | { | |
579 | int error; | |
580 | error = class_register(&firmware_class); | |
581 | if (error) { | |
582 | printk(KERN_ERR "%s: class_register failed\n", __FUNCTION__); | |
583 | return error; | |
584 | } | |
585 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
586 | if (error) { | |
587 | printk(KERN_ERR "%s: class_create_file failed\n", | |
588 | __FUNCTION__); | |
589 | class_unregister(&firmware_class); | |
590 | } | |
591 | return error; | |
592 | ||
593 | } | |
594 | static void __exit | |
595 | firmware_class_exit(void) | |
596 | { | |
597 | class_unregister(&firmware_class); | |
598 | } | |
599 | ||
a30a6a2c | 600 | fs_initcall(firmware_class_init); |
1da177e4 LT |
601 | module_exit(firmware_class_exit); |
602 | ||
603 | EXPORT_SYMBOL(release_firmware); | |
604 | EXPORT_SYMBOL(request_firmware); | |
605 | EXPORT_SYMBOL(request_firmware_nowait); |