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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 | ||
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: | |
2b3a302a | 167 | printk(KERN_ERR "%s: unexpected value (%d)\n", __func__, |
1da177e4 LT |
168 | loading); |
169 | /* fallthrough */ | |
170 | case -1: | |
171 | fw_load_abort(fw_priv); | |
172 | break; | |
173 | } | |
174 | ||
175 | return count; | |
176 | } | |
177 | ||
e55c8790 | 178 | static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store); |
1da177e4 LT |
179 | |
180 | static ssize_t | |
91a69029 | 181 | firmware_data_read(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
182 | char *buffer, loff_t offset, size_t count) |
183 | { | |
e55c8790 GKH |
184 | struct device *dev = to_dev(kobj); |
185 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 | 186 | struct firmware *fw; |
f37e6617 | 187 | ssize_t ret_count; |
1da177e4 | 188 | |
cad1e55d | 189 | mutex_lock(&fw_lock); |
1da177e4 | 190 | fw = fw_priv->fw; |
b92eac01 | 191 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
192 | ret_count = -ENODEV; |
193 | goto out; | |
194 | } | |
f37e6617 AM |
195 | ret_count = memory_read_from_buffer(buffer, count, &offset, |
196 | fw->data, fw->size); | |
1da177e4 | 197 | out: |
cad1e55d | 198 | mutex_unlock(&fw_lock); |
1da177e4 LT |
199 | return ret_count; |
200 | } | |
eb8e3179 | 201 | |
1da177e4 LT |
202 | static int |
203 | fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) | |
204 | { | |
205 | u8 *new_data; | |
30560ba6 | 206 | int new_size = fw_priv->alloc_size; |
1da177e4 LT |
207 | |
208 | if (min_size <= fw_priv->alloc_size) | |
209 | return 0; | |
210 | ||
30560ba6 JM |
211 | new_size = ALIGN(min_size, PAGE_SIZE); |
212 | new_data = vmalloc(new_size); | |
1da177e4 | 213 | if (!new_data) { |
2b3a302a | 214 | printk(KERN_ERR "%s: unable to alloc buffer\n", __func__); |
1da177e4 LT |
215 | /* Make sure that we don't keep incomplete data */ |
216 | fw_load_abort(fw_priv); | |
217 | return -ENOMEM; | |
218 | } | |
30560ba6 | 219 | fw_priv->alloc_size = new_size; |
1da177e4 LT |
220 | if (fw_priv->fw->data) { |
221 | memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); | |
222 | vfree(fw_priv->fw->data); | |
223 | } | |
224 | fw_priv->fw->data = new_data; | |
225 | BUG_ON(min_size > fw_priv->alloc_size); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /** | |
eb8e3179 | 230 | * firmware_data_write - write method for firmware |
e55c8790 | 231 | * @kobj: kobject for the device |
42e61f4a | 232 | * @bin_attr: bin_attr structure |
eb8e3179 RD |
233 | * @buffer: buffer being written |
234 | * @offset: buffer offset for write in total data store area | |
235 | * @count: buffer size | |
1da177e4 | 236 | * |
eb8e3179 | 237 | * Data written to the 'data' attribute will be later handed to |
1da177e4 LT |
238 | * the driver as a firmware image. |
239 | **/ | |
240 | static ssize_t | |
91a69029 | 241 | firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr, |
1da177e4 LT |
242 | char *buffer, loff_t offset, size_t count) |
243 | { | |
e55c8790 GKH |
244 | struct device *dev = to_dev(kobj); |
245 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); | |
1da177e4 LT |
246 | struct firmware *fw; |
247 | ssize_t retval; | |
248 | ||
249 | if (!capable(CAP_SYS_RAWIO)) | |
250 | return -EPERM; | |
b92eac01 | 251 | |
cad1e55d | 252 | mutex_lock(&fw_lock); |
1da177e4 | 253 | fw = fw_priv->fw; |
b92eac01 | 254 | if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { |
1da177e4 LT |
255 | retval = -ENODEV; |
256 | goto out; | |
257 | } | |
258 | retval = fw_realloc_buffer(fw_priv, offset + count); | |
259 | if (retval) | |
260 | goto out; | |
261 | ||
b7a39bd0 | 262 | memcpy((u8 *)fw->data + offset, buffer, count); |
1da177e4 LT |
263 | |
264 | fw->size = max_t(size_t, offset + count, fw->size); | |
265 | retval = count; | |
266 | out: | |
cad1e55d | 267 | mutex_unlock(&fw_lock); |
1da177e4 LT |
268 | return retval; |
269 | } | |
eb8e3179 | 270 | |
1da177e4 | 271 | static struct bin_attribute firmware_attr_data_tmpl = { |
7b595756 | 272 | .attr = {.name = "data", .mode = 0644}, |
1da177e4 LT |
273 | .size = 0, |
274 | .read = firmware_data_read, | |
275 | .write = firmware_data_write, | |
276 | }; | |
277 | ||
e55c8790 | 278 | static void fw_dev_release(struct device *dev) |
1da177e4 | 279 | { |
e55c8790 | 280 | struct firmware_priv *fw_priv = dev_get_drvdata(dev); |
1da177e4 LT |
281 | |
282 | kfree(fw_priv); | |
e55c8790 | 283 | kfree(dev); |
1da177e4 LT |
284 | |
285 | module_put(THIS_MODULE); | |
286 | } | |
287 | ||
288 | static void | |
289 | firmware_class_timeout(u_long data) | |
290 | { | |
291 | struct firmware_priv *fw_priv = (struct firmware_priv *) data; | |
292 | fw_load_abort(fw_priv); | |
293 | } | |
294 | ||
e55c8790 | 295 | static inline void fw_setup_device_id(struct device *f_dev, struct device *dev) |
1da177e4 | 296 | { |
7d640c4a MB |
297 | /* XXX warning we should watch out for name collisions */ |
298 | strlcpy(f_dev->bus_id, dev->bus_id, BUS_ID_SIZE); | |
1da177e4 LT |
299 | } |
300 | ||
e55c8790 GKH |
301 | static int fw_register_device(struct device **dev_p, const char *fw_name, |
302 | struct device *device) | |
1da177e4 LT |
303 | { |
304 | int retval; | |
4aed0644 | 305 | struct firmware_priv *fw_priv = kzalloc(sizeof(*fw_priv), |
1da177e4 | 306 | GFP_KERNEL); |
e55c8790 | 307 | struct device *f_dev = kzalloc(sizeof(*f_dev), GFP_KERNEL); |
1da177e4 | 308 | |
e55c8790 | 309 | *dev_p = NULL; |
1da177e4 | 310 | |
e55c8790 | 311 | if (!fw_priv || !f_dev) { |
2b3a302a | 312 | printk(KERN_ERR "%s: kmalloc failed\n", __func__); |
1da177e4 LT |
313 | retval = -ENOMEM; |
314 | goto error_kfree; | |
315 | } | |
1da177e4 LT |
316 | |
317 | init_completion(&fw_priv->completion); | |
318 | fw_priv->attr_data = firmware_attr_data_tmpl; | |
319 | strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
320 | ||
321 | fw_priv->timeout.function = firmware_class_timeout; | |
322 | fw_priv->timeout.data = (u_long) fw_priv; | |
323 | init_timer(&fw_priv->timeout); | |
324 | ||
e55c8790 GKH |
325 | fw_setup_device_id(f_dev, device); |
326 | f_dev->parent = device; | |
327 | f_dev->class = &firmware_class; | |
328 | dev_set_drvdata(f_dev, fw_priv); | |
bdc4960a | 329 | f_dev->uevent_suppress = 1; |
e55c8790 | 330 | retval = device_register(f_dev); |
1da177e4 | 331 | if (retval) { |
e55c8790 | 332 | printk(KERN_ERR "%s: device_register failed\n", |
2b3a302a | 333 | __func__); |
1da177e4 LT |
334 | goto error_kfree; |
335 | } | |
e55c8790 | 336 | *dev_p = f_dev; |
1da177e4 LT |
337 | return 0; |
338 | ||
339 | error_kfree: | |
340 | kfree(fw_priv); | |
e55c8790 | 341 | kfree(f_dev); |
1da177e4 LT |
342 | return retval; |
343 | } | |
344 | ||
e55c8790 GKH |
345 | static int fw_setup_device(struct firmware *fw, struct device **dev_p, |
346 | const char *fw_name, struct device *device, | |
347 | int uevent) | |
1da177e4 | 348 | { |
e55c8790 | 349 | struct device *f_dev; |
1da177e4 LT |
350 | struct firmware_priv *fw_priv; |
351 | int retval; | |
352 | ||
e55c8790 GKH |
353 | *dev_p = NULL; |
354 | retval = fw_register_device(&f_dev, fw_name, device); | |
1da177e4 LT |
355 | if (retval) |
356 | goto out; | |
357 | ||
358 | /* Need to pin this module until class device is destroyed */ | |
359 | __module_get(THIS_MODULE); | |
360 | ||
e55c8790 | 361 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 LT |
362 | |
363 | fw_priv->fw = fw; | |
e55c8790 | 364 | retval = sysfs_create_bin_file(&f_dev->kobj, &fw_priv->attr_data); |
1da177e4 LT |
365 | if (retval) { |
366 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", | |
2b3a302a | 367 | __func__); |
1da177e4 LT |
368 | goto error_unreg; |
369 | } | |
370 | ||
e55c8790 | 371 | retval = device_create_file(f_dev, &dev_attr_loading); |
1da177e4 | 372 | if (retval) { |
e55c8790 | 373 | printk(KERN_ERR "%s: device_create_file failed\n", |
2b3a302a | 374 | __func__); |
1da177e4 LT |
375 | goto error_unreg; |
376 | } | |
377 | ||
312c004d | 378 | if (uevent) |
bdc4960a | 379 | f_dev->uevent_suppress = 0; |
e55c8790 | 380 | *dev_p = f_dev; |
1da177e4 LT |
381 | goto out; |
382 | ||
383 | error_unreg: | |
e55c8790 | 384 | device_unregister(f_dev); |
1da177e4 LT |
385 | out: |
386 | return retval; | |
387 | } | |
388 | ||
6e3eaab0 AS |
389 | static int |
390 | _request_firmware(const struct firmware **firmware_p, const char *name, | |
312c004d | 391 | struct device *device, int uevent) |
1da177e4 | 392 | { |
e55c8790 | 393 | struct device *f_dev; |
1da177e4 LT |
394 | struct firmware_priv *fw_priv; |
395 | struct firmware *firmware; | |
5658c769 | 396 | struct builtin_fw *builtin; |
1da177e4 LT |
397 | int retval; |
398 | ||
399 | if (!firmware_p) | |
400 | return -EINVAL; | |
401 | ||
4aed0644 | 402 | *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); |
1da177e4 LT |
403 | if (!firmware) { |
404 | printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n", | |
2b3a302a | 405 | __func__); |
1da177e4 LT |
406 | retval = -ENOMEM; |
407 | goto out; | |
408 | } | |
1da177e4 | 409 | |
5658c769 DW |
410 | for (builtin = __start_builtin_fw; builtin != __end_builtin_fw; |
411 | builtin++) { | |
412 | if (strcmp(name, builtin->name)) | |
413 | continue; | |
414 | printk(KERN_INFO "firmware: using built-in firmware %s\n", | |
415 | name); | |
416 | firmware->size = builtin->size; | |
417 | firmware->data = builtin->data; | |
418 | return 0; | |
419 | } | |
420 | ||
421 | if (uevent) | |
422 | printk(KERN_INFO "firmware: requesting %s\n", name); | |
423 | ||
e55c8790 | 424 | retval = fw_setup_device(firmware, &f_dev, name, device, uevent); |
1da177e4 LT |
425 | if (retval) |
426 | goto error_kfree_fw; | |
427 | ||
e55c8790 | 428 | fw_priv = dev_get_drvdata(f_dev); |
1da177e4 | 429 | |
312c004d | 430 | if (uevent) { |
6e3eaab0 AS |
431 | if (loading_timeout > 0) { |
432 | fw_priv->timeout.expires = jiffies + loading_timeout * HZ; | |
433 | add_timer(&fw_priv->timeout); | |
434 | } | |
1da177e4 | 435 | |
e55c8790 | 436 | kobject_uevent(&f_dev->kobj, KOBJ_ADD); |
6e3eaab0 AS |
437 | wait_for_completion(&fw_priv->completion); |
438 | set_bit(FW_STATUS_DONE, &fw_priv->status); | |
439 | del_timer_sync(&fw_priv->timeout); | |
440 | } else | |
441 | wait_for_completion(&fw_priv->completion); | |
1da177e4 | 442 | |
cad1e55d | 443 | mutex_lock(&fw_lock); |
1da177e4 LT |
444 | if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) { |
445 | retval = -ENOENT; | |
446 | release_firmware(fw_priv->fw); | |
447 | *firmware_p = NULL; | |
448 | } | |
449 | fw_priv->fw = NULL; | |
cad1e55d | 450 | mutex_unlock(&fw_lock); |
e55c8790 | 451 | device_unregister(f_dev); |
1da177e4 LT |
452 | goto out; |
453 | ||
454 | error_kfree_fw: | |
455 | kfree(firmware); | |
456 | *firmware_p = NULL; | |
457 | out: | |
458 | return retval; | |
459 | } | |
460 | ||
6e3eaab0 | 461 | /** |
312c004d | 462 | * request_firmware: - send firmware request and wait for it |
eb8e3179 RD |
463 | * @firmware_p: pointer to firmware image |
464 | * @name: name of firmware file | |
465 | * @device: device for which firmware is being loaded | |
466 | * | |
467 | * @firmware_p will be used to return a firmware image by the name | |
6e3eaab0 AS |
468 | * of @name for device @device. |
469 | * | |
470 | * Should be called from user context where sleeping is allowed. | |
471 | * | |
312c004d | 472 | * @name will be used as $FIRMWARE in the uevent environment and |
6e3eaab0 AS |
473 | * should be distinctive enough not to be confused with any other |
474 | * firmware image for this or any other device. | |
475 | **/ | |
476 | int | |
477 | request_firmware(const struct firmware **firmware_p, const char *name, | |
478 | struct device *device) | |
479 | { | |
312c004d KS |
480 | int uevent = 1; |
481 | return _request_firmware(firmware_p, name, device, uevent); | |
6e3eaab0 AS |
482 | } |
483 | ||
1da177e4 LT |
484 | /** |
485 | * release_firmware: - release the resource associated with a firmware image | |
eb8e3179 | 486 | * @fw: firmware resource to release |
1da177e4 LT |
487 | **/ |
488 | void | |
489 | release_firmware(const struct firmware *fw) | |
490 | { | |
5658c769 DW |
491 | struct builtin_fw *builtin; |
492 | ||
1da177e4 | 493 | if (fw) { |
5658c769 DW |
494 | for (builtin = __start_builtin_fw; builtin != __end_builtin_fw; |
495 | builtin++) { | |
496 | if (fw->data == builtin->data) | |
497 | goto free_fw; | |
498 | } | |
1da177e4 | 499 | vfree(fw->data); |
5658c769 | 500 | free_fw: |
1da177e4 LT |
501 | kfree(fw); |
502 | } | |
503 | } | |
504 | ||
1da177e4 LT |
505 | /* Async support */ |
506 | struct firmware_work { | |
507 | struct work_struct work; | |
508 | struct module *module; | |
509 | const char *name; | |
510 | struct device *device; | |
511 | void *context; | |
512 | void (*cont)(const struct firmware *fw, void *context); | |
312c004d | 513 | int uevent; |
1da177e4 LT |
514 | }; |
515 | ||
516 | static int | |
517 | request_firmware_work_func(void *arg) | |
518 | { | |
519 | struct firmware_work *fw_work = arg; | |
520 | const struct firmware *fw; | |
113fab13 | 521 | int ret; |
1da177e4 LT |
522 | if (!arg) { |
523 | WARN_ON(1); | |
524 | return 0; | |
525 | } | |
113fab13 | 526 | ret = _request_firmware(&fw, fw_work->name, fw_work->device, |
312c004d | 527 | fw_work->uevent); |
113fab13 MC |
528 | if (ret < 0) |
529 | fw_work->cont(NULL, fw_work->context); | |
530 | else { | |
531 | fw_work->cont(fw, fw_work->context); | |
532 | release_firmware(fw); | |
533 | } | |
1da177e4 LT |
534 | module_put(fw_work->module); |
535 | kfree(fw_work); | |
113fab13 | 536 | return ret; |
1da177e4 LT |
537 | } |
538 | ||
539 | /** | |
eb8e3179 RD |
540 | * request_firmware_nowait: asynchronous version of request_firmware |
541 | * @module: module requesting the firmware | |
312c004d | 542 | * @uevent: sends uevent to copy the firmware image if this flag |
eb8e3179 RD |
543 | * is non-zero else the firmware copy must be done manually. |
544 | * @name: name of firmware file | |
545 | * @device: device for which firmware is being loaded | |
546 | * @context: will be passed over to @cont, and | |
547 | * @fw may be %NULL if firmware request fails. | |
548 | * @cont: function will be called asynchronously when the firmware | |
549 | * request is over. | |
1da177e4 | 550 | * |
1da177e4 LT |
551 | * Asynchronous variant of request_firmware() for contexts where |
552 | * it is not possible to sleep. | |
1da177e4 LT |
553 | **/ |
554 | int | |
555 | request_firmware_nowait( | |
312c004d | 556 | struct module *module, int uevent, |
1da177e4 LT |
557 | const char *name, struct device *device, void *context, |
558 | void (*cont)(const struct firmware *fw, void *context)) | |
559 | { | |
563d0757 | 560 | struct task_struct *task; |
1da177e4 LT |
561 | struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work), |
562 | GFP_ATOMIC); | |
1da177e4 LT |
563 | |
564 | if (!fw_work) | |
565 | return -ENOMEM; | |
566 | if (!try_module_get(module)) { | |
567 | kfree(fw_work); | |
568 | return -EFAULT; | |
569 | } | |
570 | ||
571 | *fw_work = (struct firmware_work) { | |
572 | .module = module, | |
573 | .name = name, | |
574 | .device = device, | |
575 | .context = context, | |
576 | .cont = cont, | |
312c004d | 577 | .uevent = uevent, |
1da177e4 LT |
578 | }; |
579 | ||
563d0757 SB |
580 | task = kthread_run(request_firmware_work_func, fw_work, |
581 | "firmware/%s", name); | |
1da177e4 | 582 | |
563d0757 | 583 | if (IS_ERR(task)) { |
1da177e4 | 584 | fw_work->cont(NULL, fw_work->context); |
113fab13 MC |
585 | module_put(fw_work->module); |
586 | kfree(fw_work); | |
563d0757 | 587 | return PTR_ERR(task); |
1da177e4 LT |
588 | } |
589 | return 0; | |
590 | } | |
591 | ||
592 | static int __init | |
593 | firmware_class_init(void) | |
594 | { | |
595 | int error; | |
596 | error = class_register(&firmware_class); | |
597 | if (error) { | |
2b3a302a | 598 | printk(KERN_ERR "%s: class_register failed\n", __func__); |
1da177e4 LT |
599 | return error; |
600 | } | |
601 | error = class_create_file(&firmware_class, &class_attr_timeout); | |
602 | if (error) { | |
603 | printk(KERN_ERR "%s: class_create_file failed\n", | |
2b3a302a | 604 | __func__); |
1da177e4 LT |
605 | class_unregister(&firmware_class); |
606 | } | |
607 | return error; | |
608 | ||
609 | } | |
610 | static void __exit | |
611 | firmware_class_exit(void) | |
612 | { | |
613 | class_unregister(&firmware_class); | |
614 | } | |
615 | ||
a30a6a2c | 616 | fs_initcall(firmware_class_init); |
1da177e4 LT |
617 | module_exit(firmware_class_exit); |
618 | ||
619 | EXPORT_SYMBOL(release_firmware); | |
620 | EXPORT_SYMBOL(request_firmware); | |
621 | EXPORT_SYMBOL(request_firmware_nowait); |