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 | ||
5658c769 DW |
52 | #ifdef CONFIG_FW_LOADER |
53 | extern struct builtin_fw __start_builtin_fw[]; | |
54 | extern struct builtin_fw __end_builtin_fw[]; | |
55 | #else /* Module case. Avoid ifdefs later; it'll all optimise out */ | |
56 | static struct builtin_fw *__start_builtin_fw; | |
57 | static struct builtin_fw *__end_builtin_fw; | |
58 | #endif | |
59 | ||
858119e1 | 60 | static void |
1da177e4 LT |
61 | fw_load_abort(struct firmware_priv *fw_priv) |
62 | { | |
63 | set_bit(FW_STATUS_ABORT, &fw_priv->status); | |
64 | wmb(); | |
65 | complete(&fw_priv->completion); | |
66 | } | |
67 | ||
68 | static ssize_t | |
69 | firmware_timeout_show(struct class *class, char *buf) | |
70 | { | |
71 | return sprintf(buf, "%d\n", loading_timeout); | |
72 | } | |
73 | ||
74 | /** | |
eb8e3179 RD |
75 | * firmware_timeout_store - set number of seconds to wait for firmware |
76 | * @class: device class pointer | |
77 | * @buf: buffer to scan for timeout value | |
78 | * @count: number of bytes in @buf | |
79 | * | |
1da177e4 | 80 | * Sets the number of seconds to wait for the firmware. Once |
eb8e3179 | 81 | * this expires an error will be returned to the driver and no |
1da177e4 LT |
82 | * firmware will be provided. |
83 | * | |
eb8e3179 | 84 | * Note: zero means 'wait forever'. |
1da177e4 LT |
85 | **/ |
86 | static ssize_t | |
87 | firmware_timeout_store(struct class *class, const char *buf, size_t count) | |
88 | { | |
89 | loading_timeout = simple_strtol(buf, NULL, 10); | |
b92eac01 SG |
90 | if (loading_timeout < 0) |
91 | loading_timeout = 0; | |
1da177e4 LT |
92 | return count; |
93 | } | |
94 | ||
95 | static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store); | |
96 | ||
e55c8790 | 97 | static void fw_dev_release(struct device *dev); |
1da177e4 | 98 | |
7eff2e7a | 99 | static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 100 | { |
e55c8790 | 101 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 | 102 | |
7eff2e7a | 103 | if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->fw_id)) |
1da177e4 | 104 | return -ENOMEM; |
7eff2e7a | 105 | if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout)) |
6897089c | 106 | return -ENOMEM; |
1da177e4 LT |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
1b81d663 AB |
111 | static struct class firmware_class = { |
112 | .name = "firmware", | |
e55c8790 GKH |
113 | .dev_uevent = firmware_uevent, |
114 | .dev_release = fw_dev_release, | |
1b81d663 AB |
115 | }; |
116 | ||
e55c8790 GKH |
117 | static ssize_t firmware_loading_show(struct device *dev, |
118 | struct device_attribute *attr, char *buf) | |
1da177e4 | 119 | { |
e55c8790 | 120 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
121 | int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); |
122 | return sprintf(buf, "%d\n", loading); | |
123 | } | |
124 | ||
125 | /** | |
eb8e3179 | 126 | * firmware_loading_store - set value in the 'loading' control file |
e55c8790 | 127 | * @dev: device pointer |
af9997e4 | 128 | * @attr: device attribute pointer |
eb8e3179 RD |
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 | **/ | |
e55c8790 GKH |
138 | static ssize_t firmware_loading_store(struct device *dev, |
139 | struct device_attribute *attr, | |
140 | const char *buf, size_t count) | |
1da177e4 | 141 | { |
e55c8790 | 142 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
143 | int loading = simple_strtol(buf, NULL, 10); |
144 | ||
145 | switch (loading) { | |
146 | case 1: | |
cad1e55d | 147 | mutex_lock(&fw_lock); |
b92eac01 | 148 | if (!fw_priv->fw) { |
cad1e55d | 149 | mutex_unlock(&fw_lock); |
b92eac01 SG |
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); | |
cad1e55d | 157 | mutex_unlock(&fw_lock); |
1da177e4 LT |
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: | |
266a813c | 167 | dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading); |
1da177e4 LT |
168 | /* fallthrough */ |
169 | case -1: | |
170 | fw_load_abort(fw_priv); | |
171 | break; | |
172 | } | |
173 | ||
174 | return count; | |
175 | } | |
176 | ||
e55c8790 | 177 | static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store); |
1da177e4 LT |
178 | |
179 | static ssize_t | |
91a69029 | 180 | firmware_data_read(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
181 | char *buffer, loff_t offset, size_t count) |
182 | { | |
e55c8790 GKH |
183 | struct device *dev = to_dev(kobj); |
184 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 | 185 | struct firmware *fw; |
f37e6617 | 186 | ssize_t ret_count; |
1da177e4 | 187 | |
cad1e55d | 188 | mutex_lock(&fw_lock); |
1da177e4 | 189 | fw = fw_priv->fw; |
b92eac01 | 190 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
191 | ret_count = -ENODEV; |
192 | goto out; | |
193 | } | |
f37e6617 AM |
194 | ret_count = memory_read_from_buffer(buffer, count, &offset, |
195 | fw->data, fw->size); | |
1da177e4 | 196 | out: |
cad1e55d | 197 | mutex_unlock(&fw_lock); |
1da177e4 LT |
198 | return ret_count; |
199 | } | |
eb8e3179 | 200 | |
1da177e4 LT |
201 | static int |
202 | fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) | |
203 | { | |
204 | u8 *new_data; | |
30560ba6 | 205 | int new_size = fw_priv->alloc_size; |
1da177e4 LT |
206 | |
207 | if (min_size <= fw_priv->alloc_size) | |
208 | return 0; | |
209 | ||
30560ba6 JM |
210 | new_size = ALIGN(min_size, PAGE_SIZE); |
211 | new_data = vmalloc(new_size); | |
1da177e4 | 212 | if (!new_data) { |
2b3a302a | 213 | printk(KERN_ERR "%s: unable to alloc buffer\n", __func__); |
1da177e4 LT |
214 | /* Make sure that we don't keep incomplete data */ |
215 | fw_load_abort(fw_priv); | |
216 | return -ENOMEM; | |
217 | } | |
30560ba6 | 218 | fw_priv->alloc_size = new_size; |
1da177e4 LT |
219 | if (fw_priv->fw->data) { |
220 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
221 | vfree(fw_priv->fw->data); | |
222 | } | |
223 | fw_priv->fw->data = new_data; | |
224 | BUG_ON(min_size > fw_priv->alloc_size); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /** | |
eb8e3179 | 229 | * firmware_data_write - write method for firmware |
e55c8790 | 230 | * @kobj: kobject for the device |
42e61f4a | 231 | * @bin_attr: bin_attr structure |
eb8e3179 RD |
232 | * @buffer: buffer being written |
233 | * @offset: buffer offset for write in total data store area | |
234 | * @count: buffer size | |
1da177e4 | 235 | * |
eb8e3179 | 236 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
237 | * the driver as a firmware image. |
238 | **/ | |
239 | static ssize_t | |
91a69029 | 240 | firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
241 | char *buffer, loff_t offset, size_t count) |
242 | { | |
e55c8790 GKH |
243 | struct device *dev = to_dev(kobj); |
244 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
245 | struct firmware *fw; |
246 | ssize_t retval; | |
247 | ||
248 | if (!capable(CAP_SYS_RAWIO)) | |
249 | return -EPERM; | |
b92eac01 | 250 | |
cad1e55d | 251 | mutex_lock(&fw_lock); |
1da177e4 | 252 | fw = fw_priv->fw; |
b92eac01 | 253 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
254 | retval = -ENODEV; |
255 | goto out; | |
256 | } | |
257 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
258 | if (retval) | |
259 | goto out; | |
260 | ||
b7a39bd0 | 261 | memcpy((u8 *)fw->data + offset, buffer, count); |
1da177e4 LT |
262 | |
263 | fw->size = max_t(size_t, offset + count, fw->size); | |
264 | retval = count; | |
265 | out: | |
cad1e55d | 266 | mutex_unlock(&fw_lock); |
1da177e4 LT |
267 | return retval; |
268 | } | |
eb8e3179 | 269 | |
1da177e4 | 270 | static struct bin_attribute firmware_attr_data_tmpl = { |
7b595756 | 271 | .attr = {.name = "data", .mode = 0644}, |
1da177e4 LT |
272 | .size = 0, |
273 | .read = firmware_data_read, | |
274 | .write = firmware_data_write, | |
275 | }; | |
276 | ||
e55c8790 | 277 | static void fw_dev_release(struct device *dev) |
1da177e4 | 278 | { |
e55c8790 | 279 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
280 | |
281 | kfree(fw_priv); | |
e55c8790 | 282 | kfree(dev); |
1da177e4 LT |
283 | |
284 | module_put(THIS_MODULE); | |
285 | } | |
286 | ||
287 | static void | |
288 | firmware_class_timeout(u_long data) | |
289 | { | |
290 | struct firmware_priv *fw_priv = (struct firmware_priv *) data; | |
291 | fw_load_abort(fw_priv); | |
292 | } | |
293 | ||
e55c8790 | 294 | static inline void fw_setup_device_id(struct device *f_dev, struct device *dev) |
1da177e4 | 295 | { |
7d640c4a MB |
296 | /* XXX warning we should watch out for name collisions */ |
297 | strlcpy(f_dev->bus_id, dev->bus_id, BUS_ID_SIZE); | |
1da177e4 LT |
298 | } |
299 | ||
e55c8790 GKH |
300 | static int fw_register_device(struct device **dev_p, const char *fw_name, |
301 | struct device *device) | |
1da177e4 LT |
302 | { |
303 | int retval; | |
4aed0644 | 304 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 305 | GFP_KERNEL); |
e55c8790 | 306 | struct device *f_dev = kzalloc(sizeof(*f_dev), GFP_KERNEL); |
1da177e4 | 307 | |
e55c8790 | 308 | *dev_p = NULL; |
1da177e4 | 309 | |
e55c8790 | 310 | if (!fw_priv || !f_dev) { |
266a813c | 311 | dev_err(device, "%s: kmalloc failed\n", __func__); |
1da177e4 LT |
312 | retval = -ENOMEM; |
313 | goto error_kfree; | |
314 | } | |
1da177e4 LT |
315 | |
316 | init_completion(&fw_priv->completion); | |
317 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
318 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
319 | ||
320 | fw_priv->timeout.function = firmware_class_timeout; | |
321 | fw_priv->timeout.data = (u_long) fw_priv; | |
322 | init_timer(&fw_priv->timeout); | |
323 | ||
e55c8790 GKH |
324 | fw_setup_device_id(f_dev, device); |
325 | f_dev->parent = device; | |
326 | f_dev->class = &firmware_class; | |
327 | dev_set_drvdata(f_dev, fw_priv); | |
bdc4960a | 328 | f_dev->uevent_suppress = 1; |
e55c8790 | 329 | retval = device_register(f_dev); |
1da177e4 | 330 | if (retval) { |
266a813c | 331 | dev_err(device, "%s: device_register failed\n", __func__); |
1da177e4 LT |
332 | goto error_kfree; |
333 | } | |
e55c8790 | 334 | *dev_p = f_dev; |
1da177e4 LT |
335 | return 0; |
336 | ||
337 | error_kfree: | |
338 | kfree(fw_priv); | |
e55c8790 | 339 | kfree(f_dev); |
1da177e4 LT |
340 | return retval; |
341 | } | |
342 | ||
e55c8790 GKH |
343 | static int fw_setup_device(struct firmware *fw, struct device **dev_p, |
344 | const char *fw_name, struct device *device, | |
345 | int uevent) | |
1da177e4 | 346 | { |
e55c8790 | 347 | struct device *f_dev; |
1da177e4 LT |
348 | struct firmware_priv *fw_priv; |
349 | int retval; | |
350 | ||
e55c8790 GKH |
351 | *dev_p = NULL; |
352 | retval = fw_register_device(&f_dev, fw_name, device); | |
1da177e4 LT |
353 | if (retval) |
354 | goto out; | |
355 | ||
356 | /* Need to pin this module until class device is destroyed */ | |
357 | __module_get(THIS_MODULE); | |
358 | ||
e55c8790 | 359 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 LT |
360 | |
361 | fw_priv->fw = fw; | |
e55c8790 | 362 | retval = sysfs_create_bin_file(&f_dev->kobj, &fw_priv->attr_data); |
1da177e4 | 363 | if (retval) { |
266a813c | 364 | dev_err(device, "%s: sysfs_create_bin_file failed\n", __func__); |
1da177e4 LT |
365 | goto error_unreg; |
366 | } | |
367 | ||
e55c8790 | 368 | retval = device_create_file(f_dev, &dev_attr_loading); |
1da177e4 | 369 | if (retval) { |
266a813c | 370 | dev_err(device, "%s: device_create_file failed\n", __func__); |
1da177e4 LT |
371 | goto error_unreg; |
372 | } | |
373 | ||
312c004d | 374 | if (uevent) |
bdc4960a | 375 | f_dev->uevent_suppress = 0; |
e55c8790 | 376 | *dev_p = f_dev; |
1da177e4 LT |
377 | goto out; |
378 | ||
379 | error_unreg: | |
e55c8790 | 380 | device_unregister(f_dev); |
1da177e4 LT |
381 | out: |
382 | return retval; | |
383 | } | |
384 | ||
6e3eaab0 AS |
385 | static int |
386 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 387 | struct device *device, int uevent) |
1da177e4 | 388 | { |
e55c8790 | 389 | struct device *f_dev; |
1da177e4 LT |
390 | struct firmware_priv *fw_priv; |
391 | struct firmware *firmware; | |
5658c769 | 392 | struct builtin_fw *builtin; |
1da177e4 LT |
393 | int retval; |
394 | ||
395 | if (!firmware_p) | |
396 | return -EINVAL; | |
397 | ||
4aed0644 | 398 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 | 399 | if (!firmware) { |
266a813c BH |
400 | dev_err(device, "%s: kmalloc(struct firmware) failed\n", |
401 | __func__); | |
1da177e4 LT |
402 | retval = -ENOMEM; |
403 | goto out; | |
404 | } | |
1da177e4 | 405 | |
5658c769 DW |
406 | for (builtin = __start_builtin_fw; builtin != __end_builtin_fw; |
407 | builtin++) { | |
408 | if (strcmp(name, builtin->name)) | |
409 | continue; | |
266a813c BH |
410 | dev_info(device, "firmware: using built-in firmware %s\n", |
411 | name); | |
5658c769 DW |
412 | firmware->size = builtin->size; |
413 | firmware->data = builtin->data; | |
414 | return 0; | |
415 | } | |
416 | ||
417 | if (uevent) | |
266a813c | 418 | dev_info(device, "firmware: requesting %s\n", name); |
5658c769 | 419 | |
e55c8790 | 420 | retval = fw_setup_device(firmware, &f_dev, name, device, uevent); |
1da177e4 LT |
421 | if (retval) |
422 | goto error_kfree_fw; | |
423 | ||
e55c8790 | 424 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 | 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 | |
e55c8790 | 432 | kobject_uevent(&f_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 | 438 | |
cad1e55d | 439 | mutex_lock(&fw_lock); |
1da177e4 LT |
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; | |
cad1e55d | 446 | mutex_unlock(&fw_lock); |
e55c8790 | 447 | device_unregister(f_dev); |
1da177e4 LT |
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 | { | |
5658c769 DW |
487 | struct builtin_fw *builtin; |
488 | ||
1da177e4 | 489 | if (fw) { |
5658c769 DW |
490 | for (builtin = __start_builtin_fw; builtin != __end_builtin_fw; |
491 | builtin++) { | |
492 | if (fw->data == builtin->data) | |
493 | goto free_fw; | |
494 | } | |
1da177e4 | 495 | vfree(fw->data); |
5658c769 | 496 | free_fw: |
1da177e4 LT |
497 | kfree(fw); |
498 | } | |
499 | } | |
500 | ||
1da177e4 LT |
501 | /* Async support */ |
502 | struct firmware_work { | |
503 | struct work_struct work; | |
504 | struct module *module; | |
505 | const char *name; | |
506 | struct device *device; | |
507 | void *context; | |
508 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 509 | int uevent; |
1da177e4 LT |
510 | }; |
511 | ||
512 | static int | |
513 | request_firmware_work_func(void *arg) | |
514 | { | |
515 | struct firmware_work *fw_work = arg; | |
516 | const struct firmware *fw; | |
113fab13 | 517 | int ret; |
1da177e4 LT |
518 | if (!arg) { |
519 | WARN_ON(1); | |
520 | return 0; | |
521 | } | |
113fab13 | 522 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 523 | fw_work->uevent); |
113fab13 MC |
524 | if (ret < 0) |
525 | fw_work->cont(NULL, fw_work->context); | |
526 | else { | |
527 | fw_work->cont(fw, fw_work->context); | |
528 | release_firmware(fw); | |
529 | } | |
1da177e4 LT |
530 | module_put(fw_work->module); |
531 | kfree(fw_work); | |
113fab13 | 532 | return ret; |
1da177e4 LT |
533 | } |
534 | ||
535 | /** | |
eb8e3179 RD |
536 | * request_firmware_nowait: asynchronous version of request_firmware |
537 | * @module: module requesting the firmware | |
312c004d | 538 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
539 | * is non-zero else the firmware copy must be done manually. |
540 | * @name: name of firmware file | |
541 | * @device: device for which firmware is being loaded | |
542 | * @context: will be passed over to @cont, and | |
543 | * @fw may be %NULL if firmware request fails. | |
544 | * @cont: function will be called asynchronously when the firmware | |
545 | * request is over. | |
1da177e4 | 546 | * |
1da177e4 LT |
547 | * Asynchronous variant of request_firmware() for contexts where |
548 | * it is not possible to sleep. | |
1da177e4 LT |
549 | **/ |
550 | int | |
551 | request_firmware_nowait( | |
312c004d | 552 | struct module *module, int uevent, |
1da177e4 LT |
553 | const char *name, struct device *device, void *context, |
554 | void (*cont)(const struct firmware *fw, void *context)) | |
555 | { | |
563d0757 | 556 | struct task_struct *task; |
1da177e4 LT |
557 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), |
558 | GFP_ATOMIC); | |
1da177e4 LT |
559 | |
560 | if (!fw_work) | |
561 | return -ENOMEM; | |
562 | if (!try_module_get(module)) { | |
563 | kfree(fw_work); | |
564 | return -EFAULT; | |
565 | } | |
566 | ||
567 | *fw_work = (struct firmware_work) { | |
568 | .module = module, | |
569 | .name = name, | |
570 | .device = device, | |
571 | .context = context, | |
572 | .cont = cont, | |
312c004d | 573 | .uevent = uevent, |
1da177e4 LT |
574 | }; |
575 | ||
563d0757 SB |
576 | task = kthread_run(request_firmware_work_func, fw_work, |
577 | "firmware/%s", name); | |
1da177e4 | 578 | |
563d0757 | 579 | if (IS_ERR(task)) { |
1da177e4 | 580 | fw_work->cont(NULL, fw_work->context); |
113fab13 MC |
581 | module_put(fw_work->module); |
582 | kfree(fw_work); | |
563d0757 | 583 | return PTR_ERR(task); |
1da177e4 LT |
584 | } |
585 | return 0; | |
586 | } | |
587 | ||
588 | static int __init | |
589 | firmware_class_init(void) | |
590 | { | |
591 | int error; | |
592 | error = class_register(&firmware_class); | |
593 | if (error) { | |
2b3a302a | 594 | printk(KERN_ERR "%s: class_register failed\n", __func__); |
1da177e4 LT |
595 | return error; |
596 | } | |
597 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
598 | if (error) { | |
599 | printk(KERN_ERR "%s: class_create_file failed\n", | |
2b3a302a | 600 | __func__); |
1da177e4 LT |
601 | class_unregister(&firmware_class); |
602 | } | |
603 | return error; | |
604 | ||
605 | } | |
606 | static void __exit | |
607 | firmware_class_exit(void) | |
608 | { | |
609 | class_unregister(&firmware_class); | |
610 | } | |
611 | ||
a30a6a2c | 612 | fs_initcall(firmware_class_init); |
1da177e4 LT |
613 | module_exit(firmware_class_exit); |
614 | ||
615 | EXPORT_SYMBOL(release_firmware); | |
616 | EXPORT_SYMBOL(request_firmware); | |
617 | EXPORT_SYMBOL(request_firmware_nowait); |