Commit | Line | Data |
---|---|---|
989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * class.c - basic device class management | |
4 | * | |
5 | * Copyright (c) 2002-3 Patrick Mochel | |
6 | * Copyright (c) 2002-3 Open Source Development Labs | |
7 | * Copyright (c) 2003-2004 Greg Kroah-Hartman | |
8 | * Copyright (c) 2003-2004 IBM Corp. | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | #include <linux/device.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/kdev_t.h> | |
e9ba6365 | 16 | #include <linux/err.h> |
4e57b681 | 17 | #include <linux/slab.h> |
edfaa7c3 | 18 | #include <linux/genhd.h> |
f75b1c60 | 19 | #include <linux/mutex.h> |
1da177e4 LT |
20 | #include "base.h" |
21 | ||
22 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) | |
1da177e4 | 23 | |
4a3ad20c GKH |
24 | static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr, |
25 | char *buf) | |
1da177e4 | 26 | { |
4a3ad20c | 27 | struct class_attribute *class_attr = to_class_attr(attr); |
6b6e39a6 | 28 | struct subsys_private *cp = to_subsys_private(kobj); |
4a0c20bf | 29 | ssize_t ret = -EIO; |
1da177e4 LT |
30 | |
31 | if (class_attr->show) | |
28812fe1 | 32 | ret = class_attr->show(cp->class, class_attr, buf); |
1da177e4 LT |
33 | return ret; |
34 | } | |
35 | ||
4a3ad20c GKH |
36 | static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr, |
37 | const char *buf, size_t count) | |
1da177e4 | 38 | { |
4a3ad20c | 39 | struct class_attribute *class_attr = to_class_attr(attr); |
6b6e39a6 | 40 | struct subsys_private *cp = to_subsys_private(kobj); |
4a0c20bf | 41 | ssize_t ret = -EIO; |
1da177e4 LT |
42 | |
43 | if (class_attr->store) | |
28812fe1 | 44 | ret = class_attr->store(cp->class, class_attr, buf, count); |
1da177e4 LT |
45 | return ret; |
46 | } | |
47 | ||
4a3ad20c | 48 | static void class_release(struct kobject *kobj) |
1da177e4 | 49 | { |
6b6e39a6 | 50 | struct subsys_private *cp = to_subsys_private(kobj); |
7c71448b | 51 | struct class *class = cp->class; |
1da177e4 LT |
52 | |
53 | pr_debug("class '%s': release.\n", class->name); | |
54 | ||
55 | if (class->class_release) | |
56 | class->class_release(class); | |
57 | else | |
58 | pr_debug("class '%s' does not have a release() function, " | |
59 | "be careful\n", class->name); | |
18d19c96 LP |
60 | |
61 | kfree(cp); | |
1da177e4 LT |
62 | } |
63 | ||
bc451f20 EB |
64 | static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj) |
65 | { | |
6b6e39a6 | 66 | struct subsys_private *cp = to_subsys_private(kobj); |
bc451f20 EB |
67 | struct class *class = cp->class; |
68 | ||
69 | return class->ns_type; | |
70 | } | |
71 | ||
52cf25d0 | 72 | static const struct sysfs_ops class_sysfs_ops = { |
672d82c1 EB |
73 | .show = class_attr_show, |
74 | .store = class_attr_store, | |
1da177e4 LT |
75 | }; |
76 | ||
adc56808 | 77 | static struct kobj_type class_ktype = { |
1da177e4 LT |
78 | .sysfs_ops = &class_sysfs_ops, |
79 | .release = class_release, | |
bc451f20 | 80 | .child_ns_type = class_child_ns_type, |
1da177e4 LT |
81 | }; |
82 | ||
6b6e39a6 | 83 | /* Hotplug events for classes go to the class subsys */ |
443dbf90 | 84 | static struct kset *class_kset; |
1da177e4 LT |
85 | |
86 | ||
58292cbe TH |
87 | int class_create_file_ns(struct class *cls, const struct class_attribute *attr, |
88 | const void *ns) | |
1da177e4 LT |
89 | { |
90 | int error; | |
d34898de | 91 | |
4a3ad20c | 92 | if (cls) |
58292cbe TH |
93 | error = sysfs_create_file_ns(&cls->p->subsys.kobj, |
94 | &attr->attr, ns); | |
4a3ad20c | 95 | else |
1da177e4 LT |
96 | error = -EINVAL; |
97 | return error; | |
98 | } | |
99 | ||
58292cbe TH |
100 | void class_remove_file_ns(struct class *cls, const struct class_attribute *attr, |
101 | const void *ns) | |
1da177e4 LT |
102 | { |
103 | if (cls) | |
58292cbe | 104 | sysfs_remove_file_ns(&cls->p->subsys.kobj, &attr->attr, ns); |
1da177e4 LT |
105 | } |
106 | ||
1740757e | 107 | static struct class *class_get(struct class *cls) |
1da177e4 LT |
108 | { |
109 | if (cls) | |
6b6e39a6 | 110 | kset_get(&cls->p->subsys); |
7c71448b | 111 | return cls; |
1da177e4 LT |
112 | } |
113 | ||
4a3ad20c | 114 | static void class_put(struct class *cls) |
1da177e4 | 115 | { |
51d172d5 | 116 | if (cls) |
6b6e39a6 | 117 | kset_put(&cls->p->subsys); |
1da177e4 LT |
118 | } |
119 | ||
5a3ceb86 TH |
120 | static void klist_class_dev_get(struct klist_node *n) |
121 | { | |
122 | struct device *dev = container_of(n, struct device, knode_class); | |
123 | ||
124 | get_device(dev); | |
125 | } | |
126 | ||
127 | static void klist_class_dev_put(struct klist_node *n) | |
128 | { | |
129 | struct device *dev = container_of(n, struct device, knode_class); | |
130 | ||
131 | put_device(dev); | |
132 | } | |
133 | ||
ced6473e GKH |
134 | static int class_add_groups(struct class *cls, |
135 | const struct attribute_group **groups) | |
136 | { | |
137 | return sysfs_create_groups(&cls->p->subsys.kobj, groups); | |
138 | } | |
139 | ||
140 | static void class_remove_groups(struct class *cls, | |
141 | const struct attribute_group **groups) | |
142 | { | |
143 | return sysfs_remove_groups(&cls->p->subsys.kobj, groups); | |
144 | } | |
145 | ||
d2a3b914 | 146 | int __class_register(struct class *cls, struct lock_class_key *key) |
1da177e4 | 147 | { |
6b6e39a6 | 148 | struct subsys_private *cp; |
1da177e4 LT |
149 | int error; |
150 | ||
151 | pr_debug("device class '%s': registering\n", cls->name); | |
152 | ||
7c71448b GKH |
153 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
154 | if (!cp) | |
155 | return -ENOMEM; | |
6b6e39a6 | 156 | klist_init(&cp->klist_devices, klist_class_dev_get, klist_class_dev_put); |
ca22e56d | 157 | INIT_LIST_HEAD(&cp->interfaces); |
6b6e39a6 | 158 | kset_init(&cp->glue_dirs); |
ca22e56d | 159 | __mutex_init(&cp->mutex, "subsys mutex", key); |
6b6e39a6 | 160 | error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name); |
7c71448b GKH |
161 | if (error) { |
162 | kfree(cp); | |
1da177e4 | 163 | return error; |
7c71448b | 164 | } |
1da177e4 | 165 | |
e105b8bf DW |
166 | /* set the default /sys/dev directory for devices of this class */ |
167 | if (!cls->dev_kobj) | |
168 | cls->dev_kobj = sysfs_dev_char_kobj; | |
169 | ||
e52eec13 | 170 | #if defined(CONFIG_BLOCK) |
edfaa7c3 | 171 | /* let the block class directory show up in the root of sysfs */ |
e52eec13 | 172 | if (!sysfs_deprecated || cls != &block_class) |
6b6e39a6 | 173 | cp->subsys.kobj.kset = class_kset; |
edfaa7c3 | 174 | #else |
6b6e39a6 | 175 | cp->subsys.kobj.kset = class_kset; |
edfaa7c3 | 176 | #endif |
6b6e39a6 | 177 | cp->subsys.kobj.ktype = &class_ktype; |
7c71448b GKH |
178 | cp->class = cls; |
179 | cls->p = cp; | |
1da177e4 | 180 | |
6b6e39a6 | 181 | error = kset_register(&cp->subsys); |
7c71448b GKH |
182 | if (error) { |
183 | kfree(cp); | |
184 | return error; | |
1da177e4 | 185 | } |
ced6473e GKH |
186 | error = class_add_groups(class_get(cls), cls->class_groups); |
187 | class_put(cls); | |
1da177e4 LT |
188 | return error; |
189 | } | |
d2a3b914 | 190 | EXPORT_SYMBOL_GPL(__class_register); |
1da177e4 | 191 | |
4a3ad20c | 192 | void class_unregister(struct class *cls) |
1da177e4 LT |
193 | { |
194 | pr_debug("device class '%s': unregistering\n", cls->name); | |
ced6473e | 195 | class_remove_groups(cls, cls->class_groups); |
6b6e39a6 | 196 | kset_unregister(&cls->p->subsys); |
1da177e4 LT |
197 | } |
198 | ||
e9ba6365 | 199 | static void class_create_release(struct class *cls) |
200 | { | |
2b3a302a | 201 | pr_debug("%s called for %s\n", __func__, cls->name); |
e9ba6365 | 202 | kfree(cls); |
203 | } | |
204 | ||
2fc68447 | 205 | /** |
206 | * class_create - create a struct class structure | |
207 | * @owner: pointer to the module that is to "own" this struct class | |
208 | * @name: pointer to a string for the name of this class. | |
0e241ffd | 209 | * @key: the lock_class_key for this class; used by mutex lock debugging |
2fc68447 | 210 | * |
211 | * This is used to create a struct class pointer that can then be used | |
c3b19ff0 | 212 | * in calls to device_create(). |
2fc68447 | 213 | * |
f0eae0ed JN |
214 | * Returns &struct class pointer on success, or ERR_PTR() on error. |
215 | * | |
2fc68447 | 216 | * Note, the pointer created here is to be destroyed when finished by |
217 | * making a call to class_destroy(). | |
218 | */ | |
d2a3b914 MW |
219 | struct class *__class_create(struct module *owner, const char *name, |
220 | struct lock_class_key *key) | |
e9ba6365 | 221 | { |
222 | struct class *cls; | |
223 | int retval; | |
224 | ||
4aed0644 | 225 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 | 226 | if (!cls) { |
227 | retval = -ENOMEM; | |
228 | goto error; | |
229 | } | |
e9ba6365 | 230 | |
231 | cls->name = name; | |
232 | cls->owner = owner; | |
233 | cls->class_release = class_create_release; | |
e9ba6365 | 234 | |
d2a3b914 | 235 | retval = __class_register(cls, key); |
e9ba6365 | 236 | if (retval) |
237 | goto error; | |
238 | ||
239 | return cls; | |
240 | ||
241 | error: | |
242 | kfree(cls); | |
243 | return ERR_PTR(retval); | |
244 | } | |
d2a3b914 | 245 | EXPORT_SYMBOL_GPL(__class_create); |
e9ba6365 | 246 | |
2fc68447 | 247 | /** |
248 | * class_destroy - destroys a struct class structure | |
92a0f861 | 249 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 | 250 | * |
251 | * Note, the pointer to be destroyed must have been created with a call | |
252 | * to class_create(). | |
253 | */ | |
e9ba6365 | 254 | void class_destroy(struct class *cls) |
255 | { | |
256 | if ((cls == NULL) || (IS_ERR(cls))) | |
257 | return; | |
258 | ||
259 | class_unregister(cls); | |
260 | } | |
1da177e4 | 261 | |
5a3ceb86 TH |
262 | /** |
263 | * class_dev_iter_init - initialize class device iterator | |
264 | * @iter: class iterator to initialize | |
265 | * @class: the class we wanna iterate over | |
266 | * @start: the device to start iterating from, if any | |
267 | * @type: device_type of the devices to iterate over, NULL for all | |
268 | * | |
269 | * Initialize class iterator @iter such that it iterates over devices | |
270 | * of @class. If @start is set, the list iteration will start there, | |
271 | * otherwise if it is NULL, the iteration starts at the beginning of | |
272 | * the list. | |
273 | */ | |
274 | void class_dev_iter_init(struct class_dev_iter *iter, struct class *class, | |
275 | struct device *start, const struct device_type *type) | |
276 | { | |
277 | struct klist_node *start_knode = NULL; | |
278 | ||
279 | if (start) | |
280 | start_knode = &start->knode_class; | |
6b6e39a6 | 281 | klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode); |
5a3ceb86 TH |
282 | iter->type = type; |
283 | } | |
284 | EXPORT_SYMBOL_GPL(class_dev_iter_init); | |
285 | ||
286 | /** | |
287 | * class_dev_iter_next - iterate to the next device | |
288 | * @iter: class iterator to proceed | |
289 | * | |
290 | * Proceed @iter to the next device and return it. Returns NULL if | |
291 | * iteration is complete. | |
292 | * | |
293 | * The returned device is referenced and won't be released till | |
294 | * iterator is proceed to the next device or exited. The caller is | |
295 | * free to do whatever it wants to do with the device including | |
296 | * calling back into class code. | |
297 | */ | |
298 | struct device *class_dev_iter_next(struct class_dev_iter *iter) | |
299 | { | |
300 | struct klist_node *knode; | |
301 | struct device *dev; | |
302 | ||
303 | while (1) { | |
304 | knode = klist_next(&iter->ki); | |
305 | if (!knode) | |
306 | return NULL; | |
307 | dev = container_of(knode, struct device, knode_class); | |
308 | if (!iter->type || iter->type == dev->type) | |
309 | return dev; | |
310 | } | |
311 | } | |
312 | EXPORT_SYMBOL_GPL(class_dev_iter_next); | |
313 | ||
314 | /** | |
315 | * class_dev_iter_exit - finish iteration | |
316 | * @iter: class iterator to finish | |
317 | * | |
318 | * Finish an iteration. Always call this function after iteration is | |
319 | * complete whether the iteration ran till the end or not. | |
320 | */ | |
321 | void class_dev_iter_exit(struct class_dev_iter *iter) | |
322 | { | |
323 | klist_iter_exit(&iter->ki); | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(class_dev_iter_exit); | |
326 | ||
fd04897b DY |
327 | /** |
328 | * class_for_each_device - device iterator | |
329 | * @class: the class we're iterating | |
93562b53 | 330 | * @start: the device to start with in the list, if any. |
fd04897b DY |
331 | * @data: data for the callback |
332 | * @fn: function to be called for each device | |
333 | * | |
334 | * Iterate over @class's list of devices, and call @fn for each, | |
93562b53 GKH |
335 | * passing it @data. If @start is set, the list iteration will start |
336 | * there, otherwise if it is NULL, the iteration starts at the | |
337 | * beginning of the list. | |
fd04897b DY |
338 | * |
339 | * We check the return of @fn each time. If it returns anything | |
340 | * other than 0, we break out and return that value. | |
341 | * | |
5a3ceb86 TH |
342 | * @fn is allowed to do anything including calling back into class |
343 | * code. There's no locking restriction. | |
fd04897b | 344 | */ |
93562b53 GKH |
345 | int class_for_each_device(struct class *class, struct device *start, |
346 | void *data, int (*fn)(struct device *, void *)) | |
fd04897b | 347 | { |
5a3ceb86 | 348 | struct class_dev_iter iter; |
fd04897b DY |
349 | struct device *dev; |
350 | int error = 0; | |
351 | ||
352 | if (!class) | |
353 | return -EINVAL; | |
7c225035 DB |
354 | if (!class->p) { |
355 | WARN(1, "%s called for class '%s' before it was initialized", | |
356 | __func__, class->name); | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
5a3ceb86 TH |
360 | class_dev_iter_init(&iter, class, start, NULL); |
361 | while ((dev = class_dev_iter_next(&iter))) { | |
93562b53 | 362 | error = fn(dev, data); |
fd04897b DY |
363 | if (error) |
364 | break; | |
365 | } | |
5a3ceb86 | 366 | class_dev_iter_exit(&iter); |
fd04897b DY |
367 | |
368 | return error; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(class_for_each_device); | |
371 | ||
372 | /** | |
373 | * class_find_device - device iterator for locating a particular device | |
374 | * @class: the class we're iterating | |
695794ae | 375 | * @start: Device to begin with |
fd04897b DY |
376 | * @data: data for the match function |
377 | * @match: function to check device | |
378 | * | |
379 | * This is similar to the class_for_each_dev() function above, but it | |
380 | * returns a reference to a device that is 'found' for later use, as | |
381 | * determined by the @match callback. | |
382 | * | |
383 | * The callback should return 0 if the device doesn't match and non-zero | |
384 | * if it does. If the callback returns non-zero, this function will | |
385 | * return to the caller and not iterate over any more devices. | |
a63ca8f6 | 386 | * |
fd04897b DY |
387 | * Note, you will need to drop the reference with put_device() after use. |
388 | * | |
12077754 | 389 | * @match is allowed to do anything including calling back into class |
5a3ceb86 | 390 | * code. There's no locking restriction. |
fd04897b | 391 | */ |
695794ae | 392 | struct device *class_find_device(struct class *class, struct device *start, |
9f3b795a MM |
393 | const void *data, |
394 | int (*match)(struct device *, const void *)) | |
fd04897b | 395 | { |
5a3ceb86 | 396 | struct class_dev_iter iter; |
fd04897b | 397 | struct device *dev; |
fd04897b DY |
398 | |
399 | if (!class) | |
400 | return NULL; | |
7c225035 DB |
401 | if (!class->p) { |
402 | WARN(1, "%s called for class '%s' before it was initialized", | |
403 | __func__, class->name); | |
404 | return NULL; | |
405 | } | |
fd04897b | 406 | |
5a3ceb86 TH |
407 | class_dev_iter_init(&iter, class, start, NULL); |
408 | while ((dev = class_dev_iter_next(&iter))) { | |
695794ae | 409 | if (match(dev, data)) { |
5a3ceb86 | 410 | get_device(dev); |
fd04897b | 411 | break; |
5a3ceb86 | 412 | } |
fd04897b | 413 | } |
5a3ceb86 | 414 | class_dev_iter_exit(&iter); |
fd04897b | 415 | |
5a3ceb86 | 416 | return dev; |
fd04897b DY |
417 | } |
418 | EXPORT_SYMBOL_GPL(class_find_device); | |
419 | ||
1da177e4 LT |
420 | int class_interface_register(struct class_interface *class_intf) |
421 | { | |
422 | struct class *parent; | |
5a3ceb86 | 423 | struct class_dev_iter iter; |
c47ed219 | 424 | struct device *dev; |
1da177e4 LT |
425 | |
426 | if (!class_intf || !class_intf->class) | |
427 | return -ENODEV; | |
428 | ||
429 | parent = class_get(class_intf->class); | |
430 | if (!parent) | |
431 | return -EINVAL; | |
432 | ||
ca22e56d KS |
433 | mutex_lock(&parent->p->mutex); |
434 | list_add_tail(&class_intf->node, &parent->p->interfaces); | |
c47ed219 | 435 | if (class_intf->add_dev) { |
5a3ceb86 TH |
436 | class_dev_iter_init(&iter, parent, NULL, NULL); |
437 | while ((dev = class_dev_iter_next(&iter))) | |
c47ed219 | 438 | class_intf->add_dev(dev, class_intf); |
5a3ceb86 | 439 | class_dev_iter_exit(&iter); |
c47ed219 | 440 | } |
ca22e56d | 441 | mutex_unlock(&parent->p->mutex); |
1da177e4 LT |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
446 | void class_interface_unregister(struct class_interface *class_intf) | |
447 | { | |
4a3ad20c | 448 | struct class *parent = class_intf->class; |
5a3ceb86 | 449 | struct class_dev_iter iter; |
c47ed219 | 450 | struct device *dev; |
1da177e4 LT |
451 | |
452 | if (!parent) | |
453 | return; | |
454 | ||
ca22e56d | 455 | mutex_lock(&parent->p->mutex); |
1da177e4 | 456 | list_del_init(&class_intf->node); |
c47ed219 | 457 | if (class_intf->remove_dev) { |
5a3ceb86 TH |
458 | class_dev_iter_init(&iter, parent, NULL, NULL); |
459 | while ((dev = class_dev_iter_next(&iter))) | |
c47ed219 | 460 | class_intf->remove_dev(dev, class_intf); |
5a3ceb86 | 461 | class_dev_iter_exit(&iter); |
c47ed219 | 462 | } |
ca22e56d | 463 | mutex_unlock(&parent->p->mutex); |
1da177e4 LT |
464 | |
465 | class_put(parent); | |
466 | } | |
467 | ||
319684b1 BP |
468 | ssize_t show_class_attr_string(struct class *class, |
469 | struct class_attribute *attr, char *buf) | |
869dfc87 AK |
470 | { |
471 | struct class_attribute_string *cs; | |
d34898de | 472 | |
869dfc87 AK |
473 | cs = container_of(attr, struct class_attribute_string, attr); |
474 | return snprintf(buf, PAGE_SIZE, "%s\n", cs->str); | |
475 | } | |
476 | ||
477 | EXPORT_SYMBOL_GPL(show_class_attr_string); | |
478 | ||
46227094 JD |
479 | struct class_compat { |
480 | struct kobject *kobj; | |
481 | }; | |
482 | ||
483 | /** | |
484 | * class_compat_register - register a compatibility class | |
485 | * @name: the name of the class | |
486 | * | |
487 | * Compatibility class are meant as a temporary user-space compatibility | |
488 | * workaround when converting a family of class devices to a bus devices. | |
489 | */ | |
490 | struct class_compat *class_compat_register(const char *name) | |
491 | { | |
492 | struct class_compat *cls; | |
493 | ||
494 | cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL); | |
495 | if (!cls) | |
496 | return NULL; | |
497 | cls->kobj = kobject_create_and_add(name, &class_kset->kobj); | |
498 | if (!cls->kobj) { | |
499 | kfree(cls); | |
500 | return NULL; | |
501 | } | |
502 | return cls; | |
503 | } | |
504 | EXPORT_SYMBOL_GPL(class_compat_register); | |
505 | ||
506 | /** | |
507 | * class_compat_unregister - unregister a compatibility class | |
508 | * @cls: the class to unregister | |
509 | */ | |
510 | void class_compat_unregister(struct class_compat *cls) | |
511 | { | |
512 | kobject_put(cls->kobj); | |
513 | kfree(cls); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(class_compat_unregister); | |
516 | ||
517 | /** | |
518 | * class_compat_create_link - create a compatibility class device link to | |
519 | * a bus device | |
520 | * @cls: the compatibility class | |
521 | * @dev: the target bus device | |
522 | * @device_link: an optional device to which a "device" link should be created | |
523 | */ | |
524 | int class_compat_create_link(struct class_compat *cls, struct device *dev, | |
525 | struct device *device_link) | |
526 | { | |
527 | int error; | |
528 | ||
529 | error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev)); | |
530 | if (error) | |
531 | return error; | |
532 | ||
533 | /* | |
534 | * Optionally add a "device" link (typically to the parent), as a | |
535 | * class device would have one and we want to provide as much | |
536 | * backwards compatibility as possible. | |
537 | */ | |
538 | if (device_link) { | |
539 | error = sysfs_create_link(&dev->kobj, &device_link->kobj, | |
540 | "device"); | |
541 | if (error) | |
542 | sysfs_remove_link(cls->kobj, dev_name(dev)); | |
543 | } | |
544 | ||
545 | return error; | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(class_compat_create_link); | |
548 | ||
549 | /** | |
550 | * class_compat_remove_link - remove a compatibility class device link to | |
551 | * a bus device | |
552 | * @cls: the compatibility class | |
553 | * @dev: the target bus device | |
554 | * @device_link: an optional device to which a "device" link was previously | |
555 | * created | |
556 | */ | |
557 | void class_compat_remove_link(struct class_compat *cls, struct device *dev, | |
558 | struct device *device_link) | |
559 | { | |
560 | if (device_link) | |
561 | sysfs_remove_link(&dev->kobj, "device"); | |
562 | sysfs_remove_link(cls->kobj, dev_name(dev)); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(class_compat_remove_link); | |
565 | ||
1da177e4 LT |
566 | int __init classes_init(void) |
567 | { | |
443dbf90 GKH |
568 | class_kset = kset_create_and_add("class", NULL, NULL); |
569 | if (!class_kset) | |
570 | return -ENOMEM; | |
1da177e4 LT |
571 | return 0; |
572 | } | |
573 | ||
58292cbe TH |
574 | EXPORT_SYMBOL_GPL(class_create_file_ns); |
575 | EXPORT_SYMBOL_GPL(class_remove_file_ns); | |
1da177e4 | 576 | EXPORT_SYMBOL_GPL(class_unregister); |
e9ba6365 | 577 | EXPORT_SYMBOL_GPL(class_destroy); |
1da177e4 | 578 | |
1da177e4 LT |
579 | EXPORT_SYMBOL_GPL(class_interface_register); |
580 | EXPORT_SYMBOL_GPL(class_interface_unregister); |