Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * firmware_class.c - Multi purpose firmware loading support | |
3 | * | |
87d37a4f | 4 | * Copyright (c) 2003 Manuel Estrada Sainz |
1da177e4 LT |
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 | ||
87d37a4f | 26 | MODULE_AUTHOR("Manuel Estrada Sainz"); |
1da177e4 LT |
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, | |
1da177e4 LT |
34 | }; |
35 | ||
2f65168d | 36 | static int loading_timeout = 60; /* In seconds */ |
1da177e4 LT |
37 | |
38 | /* fw_lock could be moved to 'struct firmware_priv' but since it is just | |
39 | * guarding for corner cases a global lock should be OK */ | |
cad1e55d | 40 | static DEFINE_MUTEX(fw_lock); |
1da177e4 LT |
41 | |
42 | struct firmware_priv { | |
43 | char fw_id[FIRMWARE_NAME_MAX]; | |
44 | struct completion completion; | |
45 | struct bin_attribute attr_data; | |
46 | struct firmware *fw; | |
47 | unsigned long status; | |
48 | int alloc_size; | |
49 | struct timer_list timeout; | |
50 | }; | |
51 | ||
858119e1 | 52 | static void |
1da177e4 LT |
53 | fw_load_abort(struct firmware_priv *fw_priv) |
54 | { | |
55 | set_bit(FW_STATUS_ABORT, &fw_priv->status); | |
56 | wmb(); | |
57 | complete(&fw_priv->completion); | |
58 | } | |
59 | ||
60 | static ssize_t | |
61 | firmware_timeout_show(struct class *class, char *buf) | |
62 | { | |
63 | return sprintf(buf, "%d\n", loading_timeout); | |
64 | } | |
65 | ||
66 | /** | |
eb8e3179 RD |
67 | * firmware_timeout_store - set number of seconds to wait for firmware |
68 | * @class: device class pointer | |
69 | * @buf: buffer to scan for timeout value | |
70 | * @count: number of bytes in @buf | |
71 | * | |
1da177e4 | 72 | * Sets the number of seconds to wait for the firmware. Once |
eb8e3179 | 73 | * this expires an error will be returned to the driver and no |
1da177e4 LT |
74 | * firmware will be provided. |
75 | * | |
eb8e3179 | 76 | * Note: zero means 'wait forever'. |
1da177e4 LT |
77 | **/ |
78 | static ssize_t | |
79 | firmware_timeout_store(struct class *class, const char *buf, size_t count) | |
80 | { | |
81 | loading_timeout = simple_strtol(buf, NULL, 10); | |
b92eac01 SG |
82 | if (loading_timeout < 0) |
83 | loading_timeout = 0; | |
1da177e4 LT |
84 | return count; |
85 | } | |
86 | ||
87 | static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store); | |
88 | ||
e55c8790 | 89 | static void fw_dev_release(struct device *dev); |
1da177e4 | 90 | |
e55c8790 GKH |
91 | static int firmware_uevent(struct device *dev, char **envp, int num_envp, |
92 | char *buffer, int buffer_size) | |
1da177e4 | 93 | { |
e55c8790 | 94 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
95 | int i = 0, len = 0; |
96 | ||
312c004d KS |
97 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
98 | "FIRMWARE=%s", fw_priv->fw_id)) | |
1da177e4 | 99 | return -ENOMEM; |
312c004d KS |
100 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
101 | "TIMEOUT=%i", loading_timeout)) | |
6897089c | 102 | return -ENOMEM; |
1da177e4 LT |
103 | envp[i] = NULL; |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
1b81d663 AB |
108 | static struct class firmware_class = { |
109 | .name = "firmware", | |
e55c8790 GKH |
110 | .dev_uevent = firmware_uevent, |
111 | .dev_release = fw_dev_release, | |
1b81d663 AB |
112 | }; |
113 | ||
e55c8790 GKH |
114 | static ssize_t firmware_loading_show(struct device *dev, |
115 | struct device_attribute *attr, char *buf) | |
1da177e4 | 116 | { |
e55c8790 | 117 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
118 | int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); |
119 | return sprintf(buf, "%d\n", loading); | |
120 | } | |
121 | ||
122 | /** | |
eb8e3179 | 123 | * firmware_loading_store - set value in the 'loading' control file |
e55c8790 | 124 | * @dev: device pointer |
af9997e4 | 125 | * @attr: device attribute pointer |
eb8e3179 RD |
126 | * @buf: buffer to scan for loading control value |
127 | * @count: number of bytes in @buf | |
128 | * | |
1da177e4 LT |
129 | * The relevant values are: |
130 | * | |
131 | * 1: Start a load, discarding any previous partial load. | |
eb8e3179 | 132 | * 0: Conclude the load and hand the data to the driver code. |
1da177e4 LT |
133 | * -1: Conclude the load with an error and discard any written data. |
134 | **/ | |
e55c8790 GKH |
135 | static ssize_t firmware_loading_store(struct device *dev, |
136 | struct device_attribute *attr, | |
137 | const char *buf, size_t count) | |
1da177e4 | 138 | { |
e55c8790 | 139 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
140 | int loading = simple_strtol(buf, NULL, 10); |
141 | ||
142 | switch (loading) { | |
143 | case 1: | |
cad1e55d | 144 | mutex_lock(&fw_lock); |
b92eac01 | 145 | if (!fw_priv->fw) { |
cad1e55d | 146 | mutex_unlock(&fw_lock); |
b92eac01 SG |
147 | break; |
148 | } | |
1da177e4 LT |
149 | vfree(fw_priv->fw->data); |
150 | fw_priv->fw->data = NULL; | |
151 | fw_priv->fw->size = 0; | |
152 | fw_priv->alloc_size = 0; | |
153 | set_bit(FW_STATUS_LOADING, &fw_priv->status); | |
cad1e55d | 154 | mutex_unlock(&fw_lock); |
1da177e4 LT |
155 | break; |
156 | case 0: | |
157 | if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) { | |
158 | complete(&fw_priv->completion); | |
159 | clear_bit(FW_STATUS_LOADING, &fw_priv->status); | |
160 | break; | |
161 | } | |
162 | /* fallthrough */ | |
163 | default: | |
164 | printk(KERN_ERR "%s: unexpected value (%d)\n", __FUNCTION__, | |
165 | loading); | |
166 | /* fallthrough */ | |
167 | case -1: | |
168 | fw_load_abort(fw_priv); | |
169 | break; | |
170 | } | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
e55c8790 | 175 | static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store); |
1da177e4 LT |
176 | |
177 | static ssize_t | |
91a69029 | 178 | firmware_data_read(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
179 | char *buffer, loff_t offset, size_t count) |
180 | { | |
e55c8790 GKH |
181 | struct device *dev = to_dev(kobj); |
182 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
183 | struct firmware *fw; |
184 | ssize_t ret_count = count; | |
185 | ||
cad1e55d | 186 | mutex_lock(&fw_lock); |
1da177e4 | 187 | fw = fw_priv->fw; |
b92eac01 | 188 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
189 | ret_count = -ENODEV; |
190 | goto out; | |
191 | } | |
192 | if (offset > fw->size) { | |
193 | ret_count = 0; | |
194 | goto out; | |
195 | } | |
196 | if (offset + ret_count > fw->size) | |
197 | ret_count = fw->size - offset; | |
198 | ||
199 | memcpy(buffer, fw->data + offset, ret_count); | |
200 | out: | |
cad1e55d | 201 | mutex_unlock(&fw_lock); |
1da177e4 LT |
202 | return ret_count; |
203 | } | |
eb8e3179 | 204 | |
1da177e4 LT |
205 | static int |
206 | fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) | |
207 | { | |
208 | u8 *new_data; | |
30560ba6 | 209 | int new_size = fw_priv->alloc_size; |
1da177e4 LT |
210 | |
211 | if (min_size <= fw_priv->alloc_size) | |
212 | return 0; | |
213 | ||
30560ba6 JM |
214 | new_size = ALIGN(min_size, PAGE_SIZE); |
215 | new_data = vmalloc(new_size); | |
1da177e4 LT |
216 | if (!new_data) { |
217 | printk(KERN_ERR "%s: unable to alloc buffer\n", __FUNCTION__); | |
218 | /* Make sure that we don't keep incomplete data */ | |
219 | fw_load_abort(fw_priv); | |
220 | return -ENOMEM; | |
221 | } | |
30560ba6 | 222 | fw_priv->alloc_size = new_size; |
1da177e4 LT |
223 | if (fw_priv->fw->data) { |
224 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
225 | vfree(fw_priv->fw->data); | |
226 | } | |
227 | fw_priv->fw->data = new_data; | |
228 | BUG_ON(min_size > fw_priv->alloc_size); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /** | |
eb8e3179 | 233 | * firmware_data_write - write method for firmware |
e55c8790 | 234 | * @kobj: kobject for the device |
eb8e3179 RD |
235 | * @buffer: buffer being written |
236 | * @offset: buffer offset for write in total data store area | |
237 | * @count: buffer size | |
1da177e4 | 238 | * |
eb8e3179 | 239 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
240 | * the driver as a firmware image. |
241 | **/ | |
242 | static ssize_t | |
91a69029 | 243 | firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
244 | char *buffer, loff_t offset, size_t count) |
245 | { | |
e55c8790 GKH |
246 | struct device *dev = to_dev(kobj); |
247 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
248 | struct firmware *fw; |
249 | ssize_t retval; | |
250 | ||
251 | if (!capable(CAP_SYS_RAWIO)) | |
252 | return -EPERM; | |
b92eac01 | 253 | |
cad1e55d | 254 | mutex_lock(&fw_lock); |
1da177e4 | 255 | fw = fw_priv->fw; |
b92eac01 | 256 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
257 | retval = -ENODEV; |
258 | goto out; | |
259 | } | |
260 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
261 | if (retval) | |
262 | goto out; | |
263 | ||
264 | memcpy(fw->data + offset, buffer, count); | |
265 | ||
266 | fw->size = max_t(size_t, offset + count, fw->size); | |
267 | retval = count; | |
268 | out: | |
cad1e55d | 269 | mutex_unlock(&fw_lock); |
1da177e4 LT |
270 | return retval; |
271 | } | |
eb8e3179 | 272 | |
1da177e4 | 273 | static struct bin_attribute firmware_attr_data_tmpl = { |
7b595756 | 274 | .attr = {.name = "data", .mode = 0644}, |
1da177e4 LT |
275 | .size = 0, |
276 | .read = firmware_data_read, | |
277 | .write = firmware_data_write, | |
278 | }; | |
279 | ||
e55c8790 | 280 | static void fw_dev_release(struct device *dev) |
1da177e4 | 281 | { |
e55c8790 | 282 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
283 | |
284 | kfree(fw_priv); | |
e55c8790 | 285 | kfree(dev); |
1da177e4 LT |
286 | |
287 | module_put(THIS_MODULE); | |
288 | } | |
289 | ||
290 | static void | |
291 | firmware_class_timeout(u_long data) | |
292 | { | |
293 | struct firmware_priv *fw_priv = (struct firmware_priv *) data; | |
294 | fw_load_abort(fw_priv); | |
295 | } | |
296 | ||
e55c8790 | 297 | static inline void fw_setup_device_id(struct device *f_dev, struct device *dev) |
1da177e4 LT |
298 | { |
299 | /* XXX warning we should watch out for name collisions */ | |
e55c8790 | 300 | strlcpy(f_dev->bus_id, dev->bus_id, BUS_ID_SIZE); |
1da177e4 LT |
301 | } |
302 | ||
e55c8790 GKH |
303 | static int fw_register_device(struct device **dev_p, const char *fw_name, |
304 | struct device *device) | |
1da177e4 LT |
305 | { |
306 | int retval; | |
4aed0644 | 307 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 308 | GFP_KERNEL); |
e55c8790 | 309 | struct device *f_dev = kzalloc(sizeof(*f_dev), GFP_KERNEL); |
1da177e4 | 310 | |
e55c8790 | 311 | *dev_p = NULL; |
1da177e4 | 312 | |
e55c8790 | 313 | if (!fw_priv || !f_dev) { |
1da177e4 LT |
314 | printk(KERN_ERR "%s: kmalloc failed\n", __FUNCTION__); |
315 | retval = -ENOMEM; | |
316 | goto error_kfree; | |
317 | } | |
1da177e4 LT |
318 | |
319 | init_completion(&fw_priv->completion); | |
320 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
321 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
322 | ||
323 | fw_priv->timeout.function = firmware_class_timeout; | |
324 | fw_priv->timeout.data = (u_long) fw_priv; | |
325 | init_timer(&fw_priv->timeout); | |
326 | ||
e55c8790 GKH |
327 | fw_setup_device_id(f_dev, device); |
328 | f_dev->parent = device; | |
329 | f_dev->class = &firmware_class; | |
330 | dev_set_drvdata(f_dev, fw_priv); | |
bdc4960a | 331 | f_dev->uevent_suppress = 1; |
e55c8790 | 332 | retval = device_register(f_dev); |
1da177e4 | 333 | if (retval) { |
e55c8790 | 334 | printk(KERN_ERR "%s: device_register failed\n", |
1da177e4 LT |
335 | __FUNCTION__); |
336 | goto error_kfree; | |
337 | } | |
e55c8790 | 338 | *dev_p = f_dev; |
1da177e4 LT |
339 | return 0; |
340 | ||
341 | error_kfree: | |
342 | kfree(fw_priv); | |
e55c8790 | 343 | kfree(f_dev); |
1da177e4 LT |
344 | return retval; |
345 | } | |
346 | ||
e55c8790 GKH |
347 | static int fw_setup_device(struct firmware *fw, struct device **dev_p, |
348 | const char *fw_name, struct device *device, | |
349 | int uevent) | |
1da177e4 | 350 | { |
e55c8790 | 351 | struct device *f_dev; |
1da177e4 LT |
352 | struct firmware_priv *fw_priv; |
353 | int retval; | |
354 | ||
e55c8790 GKH |
355 | *dev_p = NULL; |
356 | retval = fw_register_device(&f_dev, fw_name, device); | |
1da177e4 LT |
357 | if (retval) |
358 | goto out; | |
359 | ||
360 | /* Need to pin this module until class device is destroyed */ | |
361 | __module_get(THIS_MODULE); | |
362 | ||
e55c8790 | 363 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 LT |
364 | |
365 | fw_priv->fw = fw; | |
e55c8790 | 366 | retval = sysfs_create_bin_file(&f_dev->kobj, &fw_priv->attr_data); |
1da177e4 LT |
367 | if (retval) { |
368 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", | |
369 | __FUNCTION__); | |
370 | goto error_unreg; | |
371 | } | |
372 | ||
e55c8790 | 373 | retval = device_create_file(f_dev, &dev_attr_loading); |
1da177e4 | 374 | if (retval) { |
e55c8790 | 375 | printk(KERN_ERR "%s: device_create_file failed\n", |
1da177e4 LT |
376 | __FUNCTION__); |
377 | goto error_unreg; | |
378 | } | |
379 | ||
312c004d | 380 | if (uevent) |
bdc4960a | 381 | f_dev->uevent_suppress = 0; |
e55c8790 | 382 | *dev_p = f_dev; |
1da177e4 LT |
383 | goto out; |
384 | ||
385 | error_unreg: | |
e55c8790 | 386 | device_unregister(f_dev); |
1da177e4 LT |
387 | out: |
388 | return retval; | |
389 | } | |
390 | ||
6e3eaab0 AS |
391 | static int |
392 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 393 | struct device *device, int uevent) |
1da177e4 | 394 | { |
e55c8790 | 395 | struct device *f_dev; |
1da177e4 LT |
396 | struct firmware_priv *fw_priv; |
397 | struct firmware *firmware; | |
398 | int retval; | |
399 | ||
400 | if (!firmware_p) | |
401 | return -EINVAL; | |
402 | ||
4aed0644 | 403 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 LT |
404 | if (!firmware) { |
405 | printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n", | |
406 | __FUNCTION__); | |
407 | retval = -ENOMEM; | |
408 | goto out; | |
409 | } | |
1da177e4 | 410 | |
e55c8790 | 411 | retval = fw_setup_device(firmware, &f_dev, name, device, uevent); |
1da177e4 LT |
412 | if (retval) |
413 | goto error_kfree_fw; | |
414 | ||
e55c8790 | 415 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 | 416 | |
312c004d | 417 | if (uevent) { |
6e3eaab0 AS |
418 | if (loading_timeout > 0) { |
419 | fw_priv->timeout.expires = jiffies + loading_timeout * HZ; | |
420 | add_timer(&fw_priv->timeout); | |
421 | } | |
1da177e4 | 422 | |
e55c8790 | 423 | kobject_uevent(&f_dev->kobj, KOBJ_ADD); |
6e3eaab0 AS |
424 | wait_for_completion(&fw_priv->completion); |
425 | set_bit(FW_STATUS_DONE, &fw_priv->status); | |
426 | del_timer_sync(&fw_priv->timeout); | |
427 | } else | |
428 | wait_for_completion(&fw_priv->completion); | |
1da177e4 | 429 | |
cad1e55d | 430 | mutex_lock(&fw_lock); |
1da177e4 LT |
431 | if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) { |
432 | retval = -ENOENT; | |
433 | release_firmware(fw_priv->fw); | |
434 | *firmware_p = NULL; | |
435 | } | |
436 | fw_priv->fw = NULL; | |
cad1e55d | 437 | mutex_unlock(&fw_lock); |
e55c8790 | 438 | device_unregister(f_dev); |
1da177e4 LT |
439 | goto out; |
440 | ||
441 | error_kfree_fw: | |
442 | kfree(firmware); | |
443 | *firmware_p = NULL; | |
444 | out: | |
445 | return retval; | |
446 | } | |
447 | ||
6e3eaab0 | 448 | /** |
312c004d | 449 | * request_firmware: - send firmware request and wait for it |
eb8e3179 RD |
450 | * @firmware_p: pointer to firmware image |
451 | * @name: name of firmware file | |
452 | * @device: device for which firmware is being loaded | |
453 | * | |
454 | * @firmware_p will be used to return a firmware image by the name | |
6e3eaab0 AS |
455 | * of @name for device @device. |
456 | * | |
457 | * Should be called from user context where sleeping is allowed. | |
458 | * | |
312c004d | 459 | * @name will be used as $FIRMWARE in the uevent environment and |
6e3eaab0 AS |
460 | * should be distinctive enough not to be confused with any other |
461 | * firmware image for this or any other device. | |
462 | **/ | |
463 | int | |
464 | request_firmware(const struct firmware **firmware_p, const char *name, | |
465 | struct device *device) | |
466 | { | |
312c004d KS |
467 | int uevent = 1; |
468 | return _request_firmware(firmware_p, name, device, uevent); | |
6e3eaab0 AS |
469 | } |
470 | ||
1da177e4 LT |
471 | /** |
472 | * release_firmware: - release the resource associated with a firmware image | |
eb8e3179 | 473 | * @fw: firmware resource to release |
1da177e4 LT |
474 | **/ |
475 | void | |
476 | release_firmware(const struct firmware *fw) | |
477 | { | |
478 | if (fw) { | |
479 | vfree(fw->data); | |
480 | kfree(fw); | |
481 | } | |
482 | } | |
483 | ||
1da177e4 LT |
484 | /* Async support */ |
485 | struct firmware_work { | |
486 | struct work_struct work; | |
487 | struct module *module; | |
488 | const char *name; | |
489 | struct device *device; | |
490 | void *context; | |
491 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 492 | int uevent; |
1da177e4 LT |
493 | }; |
494 | ||
495 | static int | |
496 | request_firmware_work_func(void *arg) | |
497 | { | |
498 | struct firmware_work *fw_work = arg; | |
499 | const struct firmware *fw; | |
113fab13 | 500 | int ret; |
1da177e4 LT |
501 | if (!arg) { |
502 | WARN_ON(1); | |
503 | return 0; | |
504 | } | |
113fab13 | 505 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 506 | fw_work->uevent); |
113fab13 MC |
507 | if (ret < 0) |
508 | fw_work->cont(NULL, fw_work->context); | |
509 | else { | |
510 | fw_work->cont(fw, fw_work->context); | |
511 | release_firmware(fw); | |
512 | } | |
1da177e4 LT |
513 | module_put(fw_work->module); |
514 | kfree(fw_work); | |
113fab13 | 515 | return ret; |
1da177e4 LT |
516 | } |
517 | ||
518 | /** | |
eb8e3179 RD |
519 | * request_firmware_nowait: asynchronous version of request_firmware |
520 | * @module: module requesting the firmware | |
312c004d | 521 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
522 | * is non-zero else the firmware copy must be done manually. |
523 | * @name: name of firmware file | |
524 | * @device: device for which firmware is being loaded | |
525 | * @context: will be passed over to @cont, and | |
526 | * @fw may be %NULL if firmware request fails. | |
527 | * @cont: function will be called asynchronously when the firmware | |
528 | * request is over. | |
1da177e4 | 529 | * |
1da177e4 LT |
530 | * Asynchronous variant of request_firmware() for contexts where |
531 | * it is not possible to sleep. | |
1da177e4 LT |
532 | **/ |
533 | int | |
534 | request_firmware_nowait( | |
312c004d | 535 | struct module *module, int uevent, |
1da177e4 LT |
536 | const char *name, struct device *device, void *context, |
537 | void (*cont)(const struct firmware *fw, void *context)) | |
538 | { | |
563d0757 | 539 | struct task_struct *task; |
1da177e4 LT |
540 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), |
541 | GFP_ATOMIC); | |
1da177e4 LT |
542 | |
543 | if (!fw_work) | |
544 | return -ENOMEM; | |
545 | if (!try_module_get(module)) { | |
546 | kfree(fw_work); | |
547 | return -EFAULT; | |
548 | } | |
549 | ||
550 | *fw_work = (struct firmware_work) { | |
551 | .module = module, | |
552 | .name = name, | |
553 | .device = device, | |
554 | .context = context, | |
555 | .cont = cont, | |
312c004d | 556 | .uevent = uevent, |
1da177e4 LT |
557 | }; |
558 | ||
563d0757 SB |
559 | task = kthread_run(request_firmware_work_func, fw_work, |
560 | "firmware/%s", name); | |
1da177e4 | 561 | |
563d0757 | 562 | if (IS_ERR(task)) { |
1da177e4 | 563 | fw_work->cont(NULL, fw_work->context); |
113fab13 MC |
564 | module_put(fw_work->module); |
565 | kfree(fw_work); | |
563d0757 | 566 | return PTR_ERR(task); |
1da177e4 LT |
567 | } |
568 | return 0; | |
569 | } | |
570 | ||
571 | static int __init | |
572 | firmware_class_init(void) | |
573 | { | |
574 | int error; | |
575 | error = class_register(&firmware_class); | |
576 | if (error) { | |
577 | printk(KERN_ERR "%s: class_register failed\n", __FUNCTION__); | |
578 | return error; | |
579 | } | |
580 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
581 | if (error) { | |
582 | printk(KERN_ERR "%s: class_create_file failed\n", | |
583 | __FUNCTION__); | |
584 | class_unregister(&firmware_class); | |
585 | } | |
586 | return error; | |
587 | ||
588 | } | |
589 | static void __exit | |
590 | firmware_class_exit(void) | |
591 | { | |
592 | class_unregister(&firmware_class); | |
593 | } | |
594 | ||
a30a6a2c | 595 | fs_initcall(firmware_class_init); |
1da177e4 LT |
596 | module_exit(firmware_class_exit); |
597 | ||
598 | EXPORT_SYMBOL(release_firmware); | |
599 | EXPORT_SYMBOL(request_firmware); | |
600 | EXPORT_SYMBOL(request_firmware_nowait); |