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Commit | Line | Data |
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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 | |
7eff2e7a | 91 | static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 92 | { |
e55c8790 | 93 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 | 94 | |
7eff2e7a | 95 | if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->fw_id)) |
1da177e4 | 96 | return -ENOMEM; |
7eff2e7a | 97 | if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout)) |
6897089c | 98 | return -ENOMEM; |
1da177e4 LT |
99 | |
100 | return 0; | |
101 | } | |
102 | ||
1b81d663 AB |
103 | static struct class firmware_class = { |
104 | .name = "firmware", | |
e55c8790 GKH |
105 | .dev_uevent = firmware_uevent, |
106 | .dev_release = fw_dev_release, | |
1b81d663 AB |
107 | }; |
108 | ||
e55c8790 GKH |
109 | static ssize_t firmware_loading_show(struct device *dev, |
110 | struct device_attribute *attr, char *buf) | |
1da177e4 | 111 | { |
e55c8790 | 112 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
113 | int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); |
114 | return sprintf(buf, "%d\n", loading); | |
115 | } | |
116 | ||
117 | /** | |
eb8e3179 | 118 | * firmware_loading_store - set value in the 'loading' control file |
e55c8790 | 119 | * @dev: device pointer |
af9997e4 | 120 | * @attr: device attribute pointer |
eb8e3179 RD |
121 | * @buf: buffer to scan for loading control value |
122 | * @count: number of bytes in @buf | |
123 | * | |
1da177e4 LT |
124 | * The relevant values are: |
125 | * | |
126 | * 1: Start a load, discarding any previous partial load. | |
eb8e3179 | 127 | * 0: Conclude the load and hand the data to the driver code. |
1da177e4 LT |
128 | * -1: Conclude the load with an error and discard any written data. |
129 | **/ | |
e55c8790 GKH |
130 | static ssize_t firmware_loading_store(struct device *dev, |
131 | struct device_attribute *attr, | |
132 | const char *buf, size_t count) | |
1da177e4 | 133 | { |
e55c8790 | 134 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
135 | int loading = simple_strtol(buf, NULL, 10); |
136 | ||
137 | switch (loading) { | |
138 | case 1: | |
cad1e55d | 139 | mutex_lock(&fw_lock); |
b92eac01 | 140 | if (!fw_priv->fw) { |
cad1e55d | 141 | mutex_unlock(&fw_lock); |
b92eac01 SG |
142 | break; |
143 | } | |
1da177e4 LT |
144 | vfree(fw_priv->fw->data); |
145 | fw_priv->fw->data = NULL; | |
146 | fw_priv->fw->size = 0; | |
147 | fw_priv->alloc_size = 0; | |
148 | set_bit(FW_STATUS_LOADING, &fw_priv->status); | |
cad1e55d | 149 | mutex_unlock(&fw_lock); |
1da177e4 LT |
150 | break; |
151 | case 0: | |
152 | if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) { | |
153 | complete(&fw_priv->completion); | |
154 | clear_bit(FW_STATUS_LOADING, &fw_priv->status); | |
155 | break; | |
156 | } | |
157 | /* fallthrough */ | |
158 | default: | |
2b3a302a | 159 | printk(KERN_ERR "%s: unexpected value (%d)\n", __func__, |
1da177e4 LT |
160 | loading); |
161 | /* fallthrough */ | |
162 | case -1: | |
163 | fw_load_abort(fw_priv); | |
164 | break; | |
165 | } | |
166 | ||
167 | return count; | |
168 | } | |
169 | ||
e55c8790 | 170 | static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store); |
1da177e4 LT |
171 | |
172 | static ssize_t | |
91a69029 | 173 | firmware_data_read(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
174 | char *buffer, loff_t offset, size_t count) |
175 | { | |
e55c8790 GKH |
176 | struct device *dev = to_dev(kobj); |
177 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
178 | struct firmware *fw; |
179 | ssize_t ret_count = count; | |
180 | ||
cad1e55d | 181 | mutex_lock(&fw_lock); |
1da177e4 | 182 | fw = fw_priv->fw; |
b92eac01 | 183 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
184 | ret_count = -ENODEV; |
185 | goto out; | |
186 | } | |
187 | if (offset > fw->size) { | |
188 | ret_count = 0; | |
189 | goto out; | |
190 | } | |
191 | if (offset + ret_count > fw->size) | |
192 | ret_count = fw->size - offset; | |
193 | ||
194 | memcpy(buffer, fw->data + offset, ret_count); | |
195 | out: | |
cad1e55d | 196 | mutex_unlock(&fw_lock); |
1da177e4 LT |
197 | return ret_count; |
198 | } | |
eb8e3179 | 199 | |
1da177e4 LT |
200 | static int |
201 | fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) | |
202 | { | |
203 | u8 *new_data; | |
30560ba6 | 204 | int new_size = fw_priv->alloc_size; |
1da177e4 LT |
205 | |
206 | if (min_size <= fw_priv->alloc_size) | |
207 | return 0; | |
208 | ||
30560ba6 JM |
209 | new_size = ALIGN(min_size, PAGE_SIZE); |
210 | new_data = vmalloc(new_size); | |
1da177e4 | 211 | if (!new_data) { |
2b3a302a | 212 | printk(KERN_ERR "%s: unable to alloc buffer\n", __func__); |
1da177e4 LT |
213 | /* Make sure that we don't keep incomplete data */ |
214 | fw_load_abort(fw_priv); | |
215 | return -ENOMEM; | |
216 | } | |
30560ba6 | 217 | fw_priv->alloc_size = new_size; |
1da177e4 LT |
218 | if (fw_priv->fw->data) { |
219 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
220 | vfree(fw_priv->fw->data); | |
221 | } | |
222 | fw_priv->fw->data = new_data; | |
223 | BUG_ON(min_size > fw_priv->alloc_size); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | /** | |
eb8e3179 | 228 | * firmware_data_write - write method for firmware |
e55c8790 | 229 | * @kobj: kobject for the device |
42e61f4a | 230 | * @bin_attr: bin_attr structure |
eb8e3179 RD |
231 | * @buffer: buffer being written |
232 | * @offset: buffer offset for write in total data store area | |
233 | * @count: buffer size | |
1da177e4 | 234 | * |
eb8e3179 | 235 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
236 | * the driver as a firmware image. |
237 | **/ | |
238 | static ssize_t | |
91a69029 | 239 | firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
240 | char *buffer, loff_t offset, size_t count) |
241 | { | |
e55c8790 GKH |
242 | struct device *dev = to_dev(kobj); |
243 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
244 | struct firmware *fw; |
245 | ssize_t retval; | |
246 | ||
247 | if (!capable(CAP_SYS_RAWIO)) | |
248 | return -EPERM; | |
b92eac01 | 249 | |
cad1e55d | 250 | mutex_lock(&fw_lock); |
1da177e4 | 251 | fw = fw_priv->fw; |
b92eac01 | 252 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
253 | retval = -ENODEV; |
254 | goto out; | |
255 | } | |
256 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
257 | if (retval) | |
258 | goto out; | |
259 | ||
b7a39bd0 | 260 | memcpy((u8 *)fw->data + offset, buffer, count); |
1da177e4 LT |
261 | |
262 | fw->size = max_t(size_t, offset + count, fw->size); | |
263 | retval = count; | |
264 | out: | |
cad1e55d | 265 | mutex_unlock(&fw_lock); |
1da177e4 LT |
266 | return retval; |
267 | } | |
eb8e3179 | 268 | |
1da177e4 | 269 | static struct bin_attribute firmware_attr_data_tmpl = { |
7b595756 | 270 | .attr = {.name = "data", .mode = 0644}, |
1da177e4 LT |
271 | .size = 0, |
272 | .read = firmware_data_read, | |
273 | .write = firmware_data_write, | |
274 | }; | |
275 | ||
e55c8790 | 276 | static void fw_dev_release(struct device *dev) |
1da177e4 | 277 | { |
e55c8790 | 278 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
279 | |
280 | kfree(fw_priv); | |
e55c8790 | 281 | kfree(dev); |
1da177e4 LT |
282 | |
283 | module_put(THIS_MODULE); | |
284 | } | |
285 | ||
286 | static void | |
287 | firmware_class_timeout(u_long data) | |
288 | { | |
289 | struct firmware_priv *fw_priv = (struct firmware_priv *) data; | |
290 | fw_load_abort(fw_priv); | |
291 | } | |
292 | ||
e55c8790 | 293 | static inline void fw_setup_device_id(struct device *f_dev, struct device *dev) |
1da177e4 | 294 | { |
7d640c4a MB |
295 | /* XXX warning we should watch out for name collisions */ |
296 | strlcpy(f_dev->bus_id, dev->bus_id, BUS_ID_SIZE); | |
1da177e4 LT |
297 | } |
298 | ||
e55c8790 GKH |
299 | static int fw_register_device(struct device **dev_p, const char *fw_name, |
300 | struct device *device) | |
1da177e4 LT |
301 | { |
302 | int retval; | |
4aed0644 | 303 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 304 | GFP_KERNEL); |
e55c8790 | 305 | struct device *f_dev = kzalloc(sizeof(*f_dev), GFP_KERNEL); |
1da177e4 | 306 | |
e55c8790 | 307 | *dev_p = NULL; |
1da177e4 | 308 | |
e55c8790 | 309 | if (!fw_priv || !f_dev) { |
2b3a302a | 310 | printk(KERN_ERR "%s: kmalloc failed\n", __func__); |
1da177e4 LT |
311 | retval = -ENOMEM; |
312 | goto error_kfree; | |
313 | } | |
1da177e4 LT |
314 | |
315 | init_completion(&fw_priv->completion); | |
316 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
317 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
318 | ||
319 | fw_priv->timeout.function = firmware_class_timeout; | |
320 | fw_priv->timeout.data = (u_long) fw_priv; | |
321 | init_timer(&fw_priv->timeout); | |
322 | ||
e55c8790 GKH |
323 | fw_setup_device_id(f_dev, device); |
324 | f_dev->parent = device; | |
325 | f_dev->class = &firmware_class; | |
326 | dev_set_drvdata(f_dev, fw_priv); | |
bdc4960a | 327 | f_dev->uevent_suppress = 1; |
e55c8790 | 328 | retval = device_register(f_dev); |
1da177e4 | 329 | if (retval) { |
e55c8790 | 330 | printk(KERN_ERR "%s: device_register failed\n", |
2b3a302a | 331 | __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 LT |
363 | if (retval) { |
364 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", | |
2b3a302a | 365 | __func__); |
1da177e4 LT |
366 | goto error_unreg; |
367 | } | |
368 | ||
e55c8790 | 369 | retval = device_create_file(f_dev, &dev_attr_loading); |
1da177e4 | 370 | if (retval) { |
e55c8790 | 371 | printk(KERN_ERR "%s: device_create_file failed\n", |
2b3a302a | 372 | __func__); |
1da177e4 LT |
373 | goto error_unreg; |
374 | } | |
375 | ||
312c004d | 376 | if (uevent) |
bdc4960a | 377 | f_dev->uevent_suppress = 0; |
e55c8790 | 378 | *dev_p = f_dev; |
1da177e4 LT |
379 | goto out; |
380 | ||
381 | error_unreg: | |
e55c8790 | 382 | device_unregister(f_dev); |
1da177e4 LT |
383 | out: |
384 | return retval; | |
385 | } | |
386 | ||
6e3eaab0 AS |
387 | static int |
388 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 389 | struct device *device, int uevent) |
1da177e4 | 390 | { |
e55c8790 | 391 | struct device *f_dev; |
1da177e4 LT |
392 | struct firmware_priv *fw_priv; |
393 | struct firmware *firmware; | |
394 | int retval; | |
395 | ||
396 | if (!firmware_p) | |
397 | return -EINVAL; | |
398 | ||
9a3be324 CM |
399 | printk(KERN_INFO "firmware: requesting %s\n", name); |
400 | ||
4aed0644 | 401 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 LT |
402 | if (!firmware) { |
403 | printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n", | |
2b3a302a | 404 | __func__); |
1da177e4 LT |
405 | retval = -ENOMEM; |
406 | goto out; | |
407 | } | |
1da177e4 | 408 | |
e55c8790 | 409 | retval = fw_setup_device(firmware, &f_dev, name, device, uevent); |
1da177e4 LT |
410 | if (retval) |
411 | goto error_kfree_fw; | |
412 | ||
e55c8790 | 413 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 | 414 | |
312c004d | 415 | if (uevent) { |
6e3eaab0 AS |
416 | if (loading_timeout > 0) { |
417 | fw_priv->timeout.expires = jiffies + loading_timeout * HZ; | |
418 | add_timer(&fw_priv->timeout); | |
419 | } | |
1da177e4 | 420 | |
e55c8790 | 421 | kobject_uevent(&f_dev->kobj, KOBJ_ADD); |
6e3eaab0 AS |
422 | wait_for_completion(&fw_priv->completion); |
423 | set_bit(FW_STATUS_DONE, &fw_priv->status); | |
424 | del_timer_sync(&fw_priv->timeout); | |
425 | } else | |
426 | wait_for_completion(&fw_priv->completion); | |
1da177e4 | 427 | |
cad1e55d | 428 | mutex_lock(&fw_lock); |
1da177e4 LT |
429 | if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) { |
430 | retval = -ENOENT; | |
431 | release_firmware(fw_priv->fw); | |
432 | *firmware_p = NULL; | |
433 | } | |
434 | fw_priv->fw = NULL; | |
cad1e55d | 435 | mutex_unlock(&fw_lock); |
e55c8790 | 436 | device_unregister(f_dev); |
1da177e4 LT |
437 | goto out; |
438 | ||
439 | error_kfree_fw: | |
440 | kfree(firmware); | |
441 | *firmware_p = NULL; | |
442 | out: | |
443 | return retval; | |
444 | } | |
445 | ||
6e3eaab0 | 446 | /** |
312c004d | 447 | * request_firmware: - send firmware request and wait for it |
eb8e3179 RD |
448 | * @firmware_p: pointer to firmware image |
449 | * @name: name of firmware file | |
450 | * @device: device for which firmware is being loaded | |
451 | * | |
452 | * @firmware_p will be used to return a firmware image by the name | |
6e3eaab0 AS |
453 | * of @name for device @device. |
454 | * | |
455 | * Should be called from user context where sleeping is allowed. | |
456 | * | |
312c004d | 457 | * @name will be used as $FIRMWARE in the uevent environment and |
6e3eaab0 AS |
458 | * should be distinctive enough not to be confused with any other |
459 | * firmware image for this or any other device. | |
460 | **/ | |
461 | int | |
462 | request_firmware(const struct firmware **firmware_p, const char *name, | |
463 | struct device *device) | |
464 | { | |
312c004d KS |
465 | int uevent = 1; |
466 | return _request_firmware(firmware_p, name, device, uevent); | |
6e3eaab0 AS |
467 | } |
468 | ||
1da177e4 LT |
469 | /** |
470 | * release_firmware: - release the resource associated with a firmware image | |
eb8e3179 | 471 | * @fw: firmware resource to release |
1da177e4 LT |
472 | **/ |
473 | void | |
474 | release_firmware(const struct firmware *fw) | |
475 | { | |
476 | if (fw) { | |
477 | vfree(fw->data); | |
478 | kfree(fw); | |
479 | } | |
480 | } | |
481 | ||
1da177e4 LT |
482 | /* Async support */ |
483 | struct firmware_work { | |
484 | struct work_struct work; | |
485 | struct module *module; | |
486 | const char *name; | |
487 | struct device *device; | |
488 | void *context; | |
489 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 490 | int uevent; |
1da177e4 LT |
491 | }; |
492 | ||
493 | static int | |
494 | request_firmware_work_func(void *arg) | |
495 | { | |
496 | struct firmware_work *fw_work = arg; | |
497 | const struct firmware *fw; | |
113fab13 | 498 | int ret; |
1da177e4 LT |
499 | if (!arg) { |
500 | WARN_ON(1); | |
501 | return 0; | |
502 | } | |
113fab13 | 503 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 504 | fw_work->uevent); |
113fab13 MC |
505 | if (ret < 0) |
506 | fw_work->cont(NULL, fw_work->context); | |
507 | else { | |
508 | fw_work->cont(fw, fw_work->context); | |
509 | release_firmware(fw); | |
510 | } | |
1da177e4 LT |
511 | module_put(fw_work->module); |
512 | kfree(fw_work); | |
113fab13 | 513 | return ret; |
1da177e4 LT |
514 | } |
515 | ||
516 | /** | |
eb8e3179 RD |
517 | * request_firmware_nowait: asynchronous version of request_firmware |
518 | * @module: module requesting the firmware | |
312c004d | 519 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
520 | * is non-zero else the firmware copy must be done manually. |
521 | * @name: name of firmware file | |
522 | * @device: device for which firmware is being loaded | |
523 | * @context: will be passed over to @cont, and | |
524 | * @fw may be %NULL if firmware request fails. | |
525 | * @cont: function will be called asynchronously when the firmware | |
526 | * request is over. | |
1da177e4 | 527 | * |
1da177e4 LT |
528 | * Asynchronous variant of request_firmware() for contexts where |
529 | * it is not possible to sleep. | |
1da177e4 LT |
530 | **/ |
531 | int | |
532 | request_firmware_nowait( | |
312c004d | 533 | struct module *module, int uevent, |
1da177e4 LT |
534 | const char *name, struct device *device, void *context, |
535 | void (*cont)(const struct firmware *fw, void *context)) | |
536 | { | |
563d0757 | 537 | struct task_struct *task; |
1da177e4 LT |
538 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), |
539 | GFP_ATOMIC); | |
1da177e4 LT |
540 | |
541 | if (!fw_work) | |
542 | return -ENOMEM; | |
543 | if (!try_module_get(module)) { | |
544 | kfree(fw_work); | |
545 | return -EFAULT; | |
546 | } | |
547 | ||
548 | *fw_work = (struct firmware_work) { | |
549 | .module = module, | |
550 | .name = name, | |
551 | .device = device, | |
552 | .context = context, | |
553 | .cont = cont, | |
312c004d | 554 | .uevent = uevent, |
1da177e4 LT |
555 | }; |
556 | ||
563d0757 SB |
557 | task = kthread_run(request_firmware_work_func, fw_work, |
558 | "firmware/%s", name); | |
1da177e4 | 559 | |
563d0757 | 560 | if (IS_ERR(task)) { |
1da177e4 | 561 | fw_work->cont(NULL, fw_work->context); |
113fab13 MC |
562 | module_put(fw_work->module); |
563 | kfree(fw_work); | |
563d0757 | 564 | return PTR_ERR(task); |
1da177e4 LT |
565 | } |
566 | return 0; | |
567 | } | |
568 | ||
569 | static int __init | |
570 | firmware_class_init(void) | |
571 | { | |
572 | int error; | |
573 | error = class_register(&firmware_class); | |
574 | if (error) { | |
2b3a302a | 575 | printk(KERN_ERR "%s: class_register failed\n", __func__); |
1da177e4 LT |
576 | return error; |
577 | } | |
578 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
579 | if (error) { | |
580 | printk(KERN_ERR "%s: class_create_file failed\n", | |
2b3a302a | 581 | __func__); |
1da177e4 LT |
582 | class_unregister(&firmware_class); |
583 | } | |
584 | return error; | |
585 | ||
586 | } | |
587 | static void __exit | |
588 | firmware_class_exit(void) | |
589 | { | |
590 | class_unregister(&firmware_class); | |
591 | } | |
592 | ||
a30a6a2c | 593 | fs_initcall(firmware_class_init); |
1da177e4 LT |
594 | module_exit(firmware_class_exit); |
595 | ||
596 | EXPORT_SYMBOL(release_firmware); | |
597 | EXPORT_SYMBOL(request_firmware); | |
598 | EXPORT_SYMBOL(request_firmware_nowait); |