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1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/string.h> | |
23681e47 | 18 | #include <linux/kdev_t.h> |
1da177e4 LT |
19 | |
20 | #include <asm/semaphore.h> | |
21 | ||
22 | #include "base.h" | |
23 | #include "power/power.h" | |
24 | ||
25 | int (*platform_notify)(struct device * dev) = NULL; | |
26 | int (*platform_notify_remove)(struct device * dev) = NULL; | |
27 | ||
28 | /* | |
29 | * sysfs bindings for devices. | |
30 | */ | |
31 | ||
32 | #define to_dev(obj) container_of(obj, struct device, kobj) | |
33 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
34 | ||
1da177e4 LT |
35 | static ssize_t |
36 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
37 | { | |
38 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
39 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 40 | ssize_t ret = -EIO; |
1da177e4 LT |
41 | |
42 | if (dev_attr->show) | |
54b6f35c | 43 | ret = dev_attr->show(dev, dev_attr, buf); |
1da177e4 LT |
44 | return ret; |
45 | } | |
46 | ||
47 | static ssize_t | |
48 | dev_attr_store(struct kobject * kobj, struct attribute * attr, | |
49 | const char * buf, size_t count) | |
50 | { | |
51 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
52 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 53 | ssize_t ret = -EIO; |
1da177e4 LT |
54 | |
55 | if (dev_attr->store) | |
54b6f35c | 56 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
57 | return ret; |
58 | } | |
59 | ||
60 | static struct sysfs_ops dev_sysfs_ops = { | |
61 | .show = dev_attr_show, | |
62 | .store = dev_attr_store, | |
63 | }; | |
64 | ||
65 | ||
66 | /** | |
67 | * device_release - free device structure. | |
68 | * @kobj: device's kobject. | |
69 | * | |
70 | * This is called once the reference count for the object | |
71 | * reaches 0. We forward the call to the device's release | |
72 | * method, which should handle actually freeing the structure. | |
73 | */ | |
74 | static void device_release(struct kobject * kobj) | |
75 | { | |
76 | struct device * dev = to_dev(kobj); | |
77 | ||
78 | if (dev->release) | |
79 | dev->release(dev); | |
80 | else { | |
81 | printk(KERN_ERR "Device '%s' does not have a release() function, " | |
82 | "it is broken and must be fixed.\n", | |
83 | dev->bus_id); | |
84 | WARN_ON(1); | |
85 | } | |
86 | } | |
87 | ||
88 | static struct kobj_type ktype_device = { | |
89 | .release = device_release, | |
90 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
91 | }; |
92 | ||
93 | ||
312c004d | 94 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
95 | { |
96 | struct kobj_type *ktype = get_ktype(kobj); | |
97 | ||
98 | if (ktype == &ktype_device) { | |
99 | struct device *dev = to_dev(kobj); | |
100 | if (dev->bus) | |
101 | return 1; | |
23681e47 GKH |
102 | if (dev->class) |
103 | return 1; | |
1da177e4 LT |
104 | } |
105 | return 0; | |
106 | } | |
107 | ||
312c004d | 108 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
109 | { |
110 | struct device *dev = to_dev(kobj); | |
111 | ||
23681e47 GKH |
112 | if (dev->bus) |
113 | return dev->bus->name; | |
114 | if (dev->class) | |
115 | return dev->class->name; | |
116 | return NULL; | |
1da177e4 LT |
117 | } |
118 | ||
312c004d | 119 | static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
120 | int num_envp, char *buffer, int buffer_size) |
121 | { | |
122 | struct device *dev = to_dev(kobj); | |
123 | int i = 0; | |
124 | int length = 0; | |
125 | int retval = 0; | |
126 | ||
23681e47 GKH |
127 | /* add the major/minor if present */ |
128 | if (MAJOR(dev->devt)) { | |
129 | add_uevent_var(envp, num_envp, &i, | |
130 | buffer, buffer_size, &length, | |
131 | "MAJOR=%u", MAJOR(dev->devt)); | |
132 | add_uevent_var(envp, num_envp, &i, | |
133 | buffer, buffer_size, &length, | |
134 | "MINOR=%u", MINOR(dev->devt)); | |
135 | } | |
136 | ||
1da177e4 LT |
137 | /* add bus name of physical device */ |
138 | if (dev->bus) | |
312c004d KS |
139 | add_uevent_var(envp, num_envp, &i, |
140 | buffer, buffer_size, &length, | |
141 | "PHYSDEVBUS=%s", dev->bus->name); | |
1da177e4 LT |
142 | |
143 | /* add driver name of physical device */ | |
144 | if (dev->driver) | |
312c004d KS |
145 | add_uevent_var(envp, num_envp, &i, |
146 | buffer, buffer_size, &length, | |
147 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
1da177e4 LT |
148 | |
149 | /* terminate, set to next free slot, shrink available space */ | |
150 | envp[i] = NULL; | |
151 | envp = &envp[i]; | |
152 | num_envp -= i; | |
153 | buffer = &buffer[length]; | |
154 | buffer_size -= length; | |
155 | ||
312c004d | 156 | if (dev->bus && dev->bus->uevent) { |
1da177e4 | 157 | /* have the bus specific function add its stuff */ |
312c004d | 158 | retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); |
1da177e4 | 159 | if (retval) { |
312c004d | 160 | pr_debug ("%s - uevent() returned %d\n", |
1da177e4 LT |
161 | __FUNCTION__, retval); |
162 | } | |
163 | } | |
164 | ||
165 | return retval; | |
166 | } | |
167 | ||
312c004d KS |
168 | static struct kset_uevent_ops device_uevent_ops = { |
169 | .filter = dev_uevent_filter, | |
170 | .name = dev_uevent_name, | |
171 | .uevent = dev_uevent, | |
1da177e4 LT |
172 | }; |
173 | ||
a7fd6706 KS |
174 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
175 | const char *buf, size_t count) | |
176 | { | |
312c004d | 177 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
178 | return count; |
179 | } | |
180 | ||
23681e47 GKH |
181 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
182 | char *buf) | |
183 | { | |
184 | return print_dev_t(buf, dev->devt); | |
185 | } | |
186 | ||
0863afb3 MW |
187 | /* |
188 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
189 | */ |
190 | ||
312c004d | 191 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
192 | |
193 | ||
194 | /** | |
195 | * device_create_file - create sysfs attribute file for device. | |
196 | * @dev: device. | |
197 | * @attr: device attribute descriptor. | |
198 | */ | |
199 | ||
200 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
201 | { | |
202 | int error = 0; | |
203 | if (get_device(dev)) { | |
204 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
205 | put_device(dev); | |
206 | } | |
207 | return error; | |
208 | } | |
209 | ||
210 | /** | |
211 | * device_remove_file - remove sysfs attribute file. | |
212 | * @dev: device. | |
213 | * @attr: device attribute descriptor. | |
214 | */ | |
215 | ||
216 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
217 | { | |
218 | if (get_device(dev)) { | |
219 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
220 | put_device(dev); | |
221 | } | |
222 | } | |
223 | ||
34bb61f9 JB |
224 | static void klist_children_get(struct klist_node *n) |
225 | { | |
226 | struct device *dev = container_of(n, struct device, knode_parent); | |
227 | ||
228 | get_device(dev); | |
229 | } | |
230 | ||
231 | static void klist_children_put(struct klist_node *n) | |
232 | { | |
233 | struct device *dev = container_of(n, struct device, knode_parent); | |
234 | ||
235 | put_device(dev); | |
236 | } | |
237 | ||
1da177e4 LT |
238 | |
239 | /** | |
240 | * device_initialize - init device structure. | |
241 | * @dev: device. | |
242 | * | |
243 | * This prepares the device for use by other layers, | |
244 | * including adding it to the device hierarchy. | |
245 | * It is the first half of device_register(), if called by | |
246 | * that, though it can also be called separately, so one | |
247 | * may use @dev's fields (e.g. the refcount). | |
248 | */ | |
249 | ||
250 | void device_initialize(struct device *dev) | |
251 | { | |
252 | kobj_set_kset_s(dev, devices_subsys); | |
253 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
254 | klist_init(&dev->klist_children, klist_children_get, |
255 | klist_children_put); | |
1da177e4 | 256 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 257 | INIT_LIST_HEAD(&dev->node); |
af70316a | 258 | init_MUTEX(&dev->sem); |
0ac85241 | 259 | device_init_wakeup(dev, 0); |
1da177e4 LT |
260 | } |
261 | ||
262 | /** | |
263 | * device_add - add device to device hierarchy. | |
264 | * @dev: device. | |
265 | * | |
266 | * This is part 2 of device_register(), though may be called | |
267 | * separately _iff_ device_initialize() has been called separately. | |
268 | * | |
269 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
270 | * to the global and sibling lists for the device, then | |
271 | * adds it to the other relevant subsystems of the driver model. | |
272 | */ | |
273 | int device_add(struct device *dev) | |
274 | { | |
275 | struct device *parent = NULL; | |
e9a7d305 | 276 | char *class_name = NULL; |
1da177e4 LT |
277 | int error = -EINVAL; |
278 | ||
279 | dev = get_device(dev); | |
280 | if (!dev || !strlen(dev->bus_id)) | |
281 | goto Error; | |
282 | ||
283 | parent = get_device(dev->parent); | |
284 | ||
285 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); | |
286 | ||
287 | /* first, register with generic layer. */ | |
288 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
289 | if (parent) | |
290 | dev->kobj.parent = &parent->kobj; | |
291 | ||
292 | if ((error = kobject_add(&dev->kobj))) | |
293 | goto Error; | |
a7fd6706 KS |
294 | |
295 | dev->uevent_attr.attr.name = "uevent"; | |
296 | dev->uevent_attr.attr.mode = S_IWUSR; | |
297 | if (dev->driver) | |
298 | dev->uevent_attr.attr.owner = dev->driver->owner; | |
299 | dev->uevent_attr.store = store_uevent; | |
300 | device_create_file(dev, &dev->uevent_attr); | |
301 | ||
23681e47 GKH |
302 | if (MAJOR(dev->devt)) { |
303 | struct device_attribute *attr; | |
304 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
305 | if (!attr) { | |
306 | error = -ENOMEM; | |
307 | goto PMError; | |
308 | } | |
309 | attr->attr.name = "dev"; | |
310 | attr->attr.mode = S_IRUGO; | |
311 | if (dev->driver) | |
312 | attr->attr.owner = dev->driver->owner; | |
313 | attr->show = show_dev; | |
314 | error = device_create_file(dev, attr); | |
315 | if (error) { | |
316 | kfree(attr); | |
317 | goto attrError; | |
318 | } | |
319 | ||
320 | dev->devt_attr = attr; | |
321 | } | |
322 | ||
b9d9c82b KS |
323 | if (dev->class) { |
324 | sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, | |
325 | "subsystem"); | |
23681e47 GKH |
326 | sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, |
327 | dev->bus_id); | |
e9a7d305 GKH |
328 | |
329 | sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device"); | |
330 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
331 | sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name); | |
b9d9c82b | 332 | } |
23681e47 | 333 | |
1da177e4 LT |
334 | if ((error = device_pm_add(dev))) |
335 | goto PMError; | |
336 | if ((error = bus_add_device(dev))) | |
337 | goto BusError; | |
53877d06 KS |
338 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
339 | bus_attach_device(dev); | |
1da177e4 | 340 | if (parent) |
d856f1e3 | 341 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 LT |
342 | |
343 | /* notify platform of device entry */ | |
344 | if (platform_notify) | |
345 | platform_notify(dev); | |
346 | Done: | |
e9a7d305 | 347 | kfree(class_name); |
1da177e4 LT |
348 | put_device(dev); |
349 | return error; | |
350 | BusError: | |
351 | device_pm_remove(dev); | |
352 | PMError: | |
23681e47 GKH |
353 | if (dev->devt_attr) { |
354 | device_remove_file(dev, dev->devt_attr); | |
355 | kfree(dev->devt_attr); | |
356 | } | |
357 | attrError: | |
312c004d | 358 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
359 | kobject_del(&dev->kobj); |
360 | Error: | |
361 | if (parent) | |
362 | put_device(parent); | |
363 | goto Done; | |
364 | } | |
365 | ||
366 | ||
367 | /** | |
368 | * device_register - register a device with the system. | |
369 | * @dev: pointer to the device structure | |
370 | * | |
371 | * This happens in two clean steps - initialize the device | |
372 | * and add it to the system. The two steps can be called | |
373 | * separately, but this is the easiest and most common. | |
374 | * I.e. you should only call the two helpers separately if | |
375 | * have a clearly defined need to use and refcount the device | |
376 | * before it is added to the hierarchy. | |
377 | */ | |
378 | ||
379 | int device_register(struct device *dev) | |
380 | { | |
381 | device_initialize(dev); | |
382 | return device_add(dev); | |
383 | } | |
384 | ||
385 | ||
386 | /** | |
387 | * get_device - increment reference count for device. | |
388 | * @dev: device. | |
389 | * | |
390 | * This simply forwards the call to kobject_get(), though | |
391 | * we do take care to provide for the case that we get a NULL | |
392 | * pointer passed in. | |
393 | */ | |
394 | ||
395 | struct device * get_device(struct device * dev) | |
396 | { | |
397 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
398 | } | |
399 | ||
400 | ||
401 | /** | |
402 | * put_device - decrement reference count. | |
403 | * @dev: device in question. | |
404 | */ | |
405 | void put_device(struct device * dev) | |
406 | { | |
407 | if (dev) | |
408 | kobject_put(&dev->kobj); | |
409 | } | |
410 | ||
411 | ||
412 | /** | |
413 | * device_del - delete device from system. | |
414 | * @dev: device. | |
415 | * | |
416 | * This is the first part of the device unregistration | |
417 | * sequence. This removes the device from the lists we control | |
418 | * from here, has it removed from the other driver model | |
419 | * subsystems it was added to in device_add(), and removes it | |
420 | * from the kobject hierarchy. | |
421 | * | |
422 | * NOTE: this should be called manually _iff_ device_add() was | |
423 | * also called manually. | |
424 | */ | |
425 | ||
426 | void device_del(struct device * dev) | |
427 | { | |
428 | struct device * parent = dev->parent; | |
e9a7d305 | 429 | char *class_name = NULL; |
1da177e4 | 430 | |
1da177e4 | 431 | if (parent) |
d62c0f9f | 432 | klist_del(&dev->knode_parent); |
23681e47 GKH |
433 | if (dev->devt_attr) |
434 | device_remove_file(dev, dev->devt_attr); | |
b9d9c82b KS |
435 | if (dev->class) { |
436 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
23681e47 | 437 | sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id); |
e9a7d305 GKH |
438 | class_name = make_class_name(dev->class->name, &dev->kobj); |
439 | sysfs_remove_link(&dev->kobj, "device"); | |
440 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
441 | kfree(class_name); | |
b9d9c82b | 442 | } |
a7fd6706 | 443 | device_remove_file(dev, &dev->uevent_attr); |
1da177e4 LT |
444 | |
445 | /* Notify the platform of the removal, in case they | |
446 | * need to do anything... | |
447 | */ | |
448 | if (platform_notify_remove) | |
449 | platform_notify_remove(dev); | |
450 | bus_remove_device(dev); | |
451 | device_pm_remove(dev); | |
312c004d | 452 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
453 | kobject_del(&dev->kobj); |
454 | if (parent) | |
455 | put_device(parent); | |
456 | } | |
457 | ||
458 | /** | |
459 | * device_unregister - unregister device from system. | |
460 | * @dev: device going away. | |
461 | * | |
462 | * We do this in two parts, like we do device_register(). First, | |
463 | * we remove it from all the subsystems with device_del(), then | |
464 | * we decrement the reference count via put_device(). If that | |
465 | * is the final reference count, the device will be cleaned up | |
466 | * via device_release() above. Otherwise, the structure will | |
467 | * stick around until the final reference to the device is dropped. | |
468 | */ | |
469 | void device_unregister(struct device * dev) | |
470 | { | |
471 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
472 | device_del(dev); | |
473 | put_device(dev); | |
474 | } | |
475 | ||
476 | ||
36239577 PM |
477 | static struct device * next_device(struct klist_iter * i) |
478 | { | |
479 | struct klist_node * n = klist_next(i); | |
480 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
481 | } | |
482 | ||
1da177e4 LT |
483 | /** |
484 | * device_for_each_child - device child iterator. | |
c41455fb | 485 | * @parent: parent struct device. |
1da177e4 LT |
486 | * @data: data for the callback. |
487 | * @fn: function to be called for each device. | |
488 | * | |
c41455fb | 489 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
490 | * passing it @data. |
491 | * | |
492 | * We check the return of @fn each time. If it returns anything | |
493 | * other than 0, we break out and return that value. | |
494 | */ | |
36239577 | 495 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
496 | int (*fn)(struct device *, void *)) |
497 | { | |
36239577 | 498 | struct klist_iter i; |
1da177e4 LT |
499 | struct device * child; |
500 | int error = 0; | |
501 | ||
36239577 PM |
502 | klist_iter_init(&parent->klist_children, &i); |
503 | while ((child = next_device(&i)) && !error) | |
504 | error = fn(child, data); | |
505 | klist_iter_exit(&i); | |
1da177e4 LT |
506 | return error; |
507 | } | |
508 | ||
1da177e4 LT |
509 | int __init devices_init(void) |
510 | { | |
511 | return subsystem_register(&devices_subsys); | |
512 | } | |
513 | ||
514 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
515 | ||
516 | EXPORT_SYMBOL_GPL(device_initialize); | |
517 | EXPORT_SYMBOL_GPL(device_add); | |
518 | EXPORT_SYMBOL_GPL(device_register); | |
519 | ||
520 | EXPORT_SYMBOL_GPL(device_del); | |
521 | EXPORT_SYMBOL_GPL(device_unregister); | |
522 | EXPORT_SYMBOL_GPL(get_device); | |
523 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
524 | |
525 | EXPORT_SYMBOL_GPL(device_create_file); | |
526 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
527 | |
528 | ||
529 | static void device_create_release(struct device *dev) | |
530 | { | |
531 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
532 | kfree(dev); | |
533 | } | |
534 | ||
535 | /** | |
536 | * device_create - creates a device and registers it with sysfs | |
537 | * @cs: pointer to the struct class that this device should be registered to. | |
538 | * @parent: pointer to the parent struct device of this new device, if any. | |
539 | * @dev: the dev_t for the char device to be added. | |
540 | * @fmt: string for the class device's name | |
541 | * | |
542 | * This function can be used by char device classes. A struct | |
543 | * device will be created in sysfs, registered to the specified | |
544 | * class. | |
545 | * A "dev" file will be created, showing the dev_t for the device, if | |
546 | * the dev_t is not 0,0. | |
547 | * If a pointer to a parent struct device is passed in, the newly | |
548 | * created struct device will be a child of that device in sysfs. The | |
549 | * pointer to the struct device will be returned from the call. Any | |
550 | * further sysfs files that might be required can be created using this | |
551 | * pointer. | |
552 | * | |
553 | * Note: the struct class passed to this function must have previously | |
554 | * been created with a call to class_create(). | |
555 | */ | |
556 | struct device *device_create(struct class *class, struct device *parent, | |
557 | dev_t devt, char *fmt, ...) | |
558 | { | |
559 | va_list args; | |
560 | struct device *dev = NULL; | |
561 | int retval = -ENODEV; | |
562 | ||
563 | if (class == NULL || IS_ERR(class)) | |
564 | goto error; | |
565 | if (parent == NULL) { | |
566 | printk(KERN_WARNING "%s does not work yet for NULL parents\n", __FUNCTION__); | |
567 | goto error; | |
568 | } | |
569 | ||
570 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
571 | if (!dev) { | |
572 | retval = -ENOMEM; | |
573 | goto error; | |
574 | } | |
575 | ||
576 | dev->devt = devt; | |
577 | dev->class = class; | |
578 | dev->parent = parent; | |
579 | dev->release = device_create_release; | |
580 | ||
581 | va_start(args, fmt); | |
582 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
583 | va_end(args); | |
584 | retval = device_register(dev); | |
585 | if (retval) | |
586 | goto error; | |
587 | ||
588 | /* tie the class to the device */ | |
589 | down(&class->sem); | |
590 | list_add_tail(&dev->node, &class->devices); | |
591 | up(&class->sem); | |
592 | ||
593 | return dev; | |
594 | ||
595 | error: | |
596 | kfree(dev); | |
597 | return ERR_PTR(retval); | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(device_create); | |
600 | ||
601 | /** | |
602 | * device_destroy - removes a device that was created with device_create() | |
603 | * @class: the pointer to the struct class that this device was registered * with. | |
604 | * @dev: the dev_t of the device that was previously registered. | |
605 | * | |
606 | * This call unregisters and cleans up a class device that was created with a | |
607 | * call to class_device_create() | |
608 | */ | |
609 | void device_destroy(struct class *class, dev_t devt) | |
610 | { | |
611 | struct device *dev = NULL; | |
612 | struct device *dev_tmp; | |
613 | ||
614 | down(&class->sem); | |
615 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
616 | if (dev_tmp->devt == devt) { | |
617 | dev = dev_tmp; | |
618 | break; | |
619 | } | |
620 | } | |
621 | up(&class->sem); | |
622 | ||
623 | if (dev) { | |
624 | list_del_init(&dev->node); | |
625 | device_unregister(dev); | |
626 | } | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(device_destroy); |