Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * class.c - basic device class management | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * Copyright (c) 2003-2004 Greg Kroah-Hartman | |
7 | * Copyright (c) 2003-2004 IBM Corp. | |
8 | * | |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/kdev_t.h> | |
e9ba6365 | 18 | #include <linux/err.h> |
4e57b681 | 19 | #include <linux/slab.h> |
edfaa7c3 | 20 | #include <linux/genhd.h> |
f75b1c60 | 21 | #include <linux/mutex.h> |
1da177e4 LT |
22 | #include "base.h" |
23 | ||
24 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) | |
1da177e4 | 25 | |
4a3ad20c GKH |
26 | static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr, |
27 | char *buf) | |
1da177e4 | 28 | { |
4a3ad20c | 29 | struct class_attribute *class_attr = to_class_attr(attr); |
7c71448b | 30 | struct class_private *cp = to_class(kobj); |
4a0c20bf | 31 | ssize_t ret = -EIO; |
1da177e4 LT |
32 | |
33 | if (class_attr->show) | |
7c71448b | 34 | ret = class_attr->show(cp->class, buf); |
1da177e4 LT |
35 | return ret; |
36 | } | |
37 | ||
4a3ad20c GKH |
38 | static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr, |
39 | const char *buf, size_t count) | |
1da177e4 | 40 | { |
4a3ad20c | 41 | struct class_attribute *class_attr = to_class_attr(attr); |
7c71448b | 42 | struct class_private *cp = to_class(kobj); |
4a0c20bf | 43 | ssize_t ret = -EIO; |
1da177e4 LT |
44 | |
45 | if (class_attr->store) | |
7c71448b | 46 | ret = class_attr->store(cp->class, buf, count); |
1da177e4 LT |
47 | return ret; |
48 | } | |
49 | ||
4a3ad20c | 50 | static void class_release(struct kobject *kobj) |
1da177e4 | 51 | { |
7c71448b GKH |
52 | struct class_private *cp = to_class(kobj); |
53 | struct class *class = cp->class; | |
1da177e4 LT |
54 | |
55 | pr_debug("class '%s': release.\n", class->name); | |
56 | ||
57 | if (class->class_release) | |
58 | class->class_release(class); | |
59 | else | |
60 | pr_debug("class '%s' does not have a release() function, " | |
61 | "be careful\n", class->name); | |
62 | } | |
63 | ||
64 | static struct sysfs_ops class_sysfs_ops = { | |
65 | .show = class_attr_show, | |
66 | .store = class_attr_store, | |
67 | }; | |
68 | ||
adc56808 | 69 | static struct kobj_type class_ktype = { |
1da177e4 LT |
70 | .sysfs_ops = &class_sysfs_ops, |
71 | .release = class_release, | |
72 | }; | |
73 | ||
1fbfee6c | 74 | /* Hotplug events for classes go to the class class_subsys */ |
443dbf90 | 75 | static struct kset *class_kset; |
1da177e4 LT |
76 | |
77 | ||
4a3ad20c | 78 | int class_create_file(struct class *cls, const struct class_attribute *attr) |
1da177e4 LT |
79 | { |
80 | int error; | |
4a3ad20c | 81 | if (cls) |
1fbfee6c GKH |
82 | error = sysfs_create_file(&cls->p->class_subsys.kobj, |
83 | &attr->attr); | |
4a3ad20c | 84 | else |
1da177e4 LT |
85 | error = -EINVAL; |
86 | return error; | |
87 | } | |
88 | ||
4a3ad20c | 89 | void class_remove_file(struct class *cls, const struct class_attribute *attr) |
1da177e4 LT |
90 | { |
91 | if (cls) | |
1fbfee6c | 92 | sysfs_remove_file(&cls->p->class_subsys.kobj, &attr->attr); |
1da177e4 LT |
93 | } |
94 | ||
1740757e | 95 | static struct class *class_get(struct class *cls) |
1da177e4 LT |
96 | { |
97 | if (cls) | |
1fbfee6c | 98 | kset_get(&cls->p->class_subsys); |
7c71448b | 99 | return cls; |
1da177e4 LT |
100 | } |
101 | ||
4a3ad20c | 102 | static void class_put(struct class *cls) |
1da177e4 | 103 | { |
51d172d5 | 104 | if (cls) |
1fbfee6c | 105 | kset_put(&cls->p->class_subsys); |
1da177e4 LT |
106 | } |
107 | ||
4a3ad20c | 108 | static int add_class_attrs(struct class *cls) |
1da177e4 LT |
109 | { |
110 | int i; | |
111 | int error = 0; | |
112 | ||
113 | if (cls->class_attrs) { | |
114 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { | |
4a3ad20c | 115 | error = class_create_file(cls, &cls->class_attrs[i]); |
1da177e4 | 116 | if (error) |
4a3ad20c | 117 | goto error; |
1da177e4 LT |
118 | } |
119 | } | |
4a3ad20c | 120 | done: |
1da177e4 | 121 | return error; |
4a3ad20c | 122 | error: |
1da177e4 | 123 | while (--i >= 0) |
4a3ad20c GKH |
124 | class_remove_file(cls, &cls->class_attrs[i]); |
125 | goto done; | |
1da177e4 LT |
126 | } |
127 | ||
4a3ad20c | 128 | static void remove_class_attrs(struct class *cls) |
1da177e4 LT |
129 | { |
130 | int i; | |
131 | ||
132 | if (cls->class_attrs) { | |
133 | for (i = 0; attr_name(cls->class_attrs[i]); i++) | |
4a3ad20c | 134 | class_remove_file(cls, &cls->class_attrs[i]); |
1da177e4 LT |
135 | } |
136 | } | |
137 | ||
5a3ceb86 TH |
138 | static void klist_class_dev_get(struct klist_node *n) |
139 | { | |
140 | struct device *dev = container_of(n, struct device, knode_class); | |
141 | ||
142 | get_device(dev); | |
143 | } | |
144 | ||
145 | static void klist_class_dev_put(struct klist_node *n) | |
146 | { | |
147 | struct device *dev = container_of(n, struct device, knode_class); | |
148 | ||
149 | put_device(dev); | |
150 | } | |
151 | ||
d2a3b914 | 152 | int __class_register(struct class *cls, struct lock_class_key *key) |
1da177e4 | 153 | { |
7c71448b | 154 | struct class_private *cp; |
1da177e4 LT |
155 | int error; |
156 | ||
157 | pr_debug("device class '%s': registering\n", cls->name); | |
158 | ||
7c71448b GKH |
159 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
160 | if (!cp) | |
161 | return -ENOMEM; | |
5a3ceb86 | 162 | klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put); |
184f1f77 | 163 | INIT_LIST_HEAD(&cp->class_interfaces); |
7c71448b | 164 | kset_init(&cp->class_dirs); |
f75b1c60 | 165 | __mutex_init(&cp->class_mutex, "struct class mutex", key); |
1fbfee6c | 166 | error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name); |
7c71448b GKH |
167 | if (error) { |
168 | kfree(cp); | |
1da177e4 | 169 | return error; |
7c71448b | 170 | } |
1da177e4 | 171 | |
e105b8bf DW |
172 | /* set the default /sys/dev directory for devices of this class */ |
173 | if (!cls->dev_kobj) | |
174 | cls->dev_kobj = sysfs_dev_char_kobj; | |
175 | ||
4e886c29 | 176 | #if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK) |
edfaa7c3 KS |
177 | /* let the block class directory show up in the root of sysfs */ |
178 | if (cls != &block_class) | |
1fbfee6c | 179 | cp->class_subsys.kobj.kset = class_kset; |
edfaa7c3 | 180 | #else |
1fbfee6c | 181 | cp->class_subsys.kobj.kset = class_kset; |
edfaa7c3 | 182 | #endif |
1fbfee6c | 183 | cp->class_subsys.kobj.ktype = &class_ktype; |
7c71448b GKH |
184 | cp->class = cls; |
185 | cls->p = cp; | |
1da177e4 | 186 | |
1fbfee6c | 187 | error = kset_register(&cp->class_subsys); |
7c71448b GKH |
188 | if (error) { |
189 | kfree(cp); | |
190 | return error; | |
1da177e4 | 191 | } |
7c71448b GKH |
192 | error = add_class_attrs(class_get(cls)); |
193 | class_put(cls); | |
1da177e4 LT |
194 | return error; |
195 | } | |
d2a3b914 | 196 | EXPORT_SYMBOL_GPL(__class_register); |
1da177e4 | 197 | |
4a3ad20c | 198 | void class_unregister(struct class *cls) |
1da177e4 LT |
199 | { |
200 | pr_debug("device class '%s': unregistering\n", cls->name); | |
201 | remove_class_attrs(cls); | |
1fbfee6c | 202 | kset_unregister(&cls->p->class_subsys); |
1da177e4 LT |
203 | } |
204 | ||
e9ba6365 | 205 | static void class_create_release(struct class *cls) |
206 | { | |
2b3a302a | 207 | pr_debug("%s called for %s\n", __func__, cls->name); |
e9ba6365 | 208 | kfree(cls); |
209 | } | |
210 | ||
2fc68447 | 211 | /** |
212 | * class_create - create a struct class structure | |
213 | * @owner: pointer to the module that is to "own" this struct class | |
214 | * @name: pointer to a string for the name of this class. | |
0e241ffd | 215 | * @key: the lock_class_key for this class; used by mutex lock debugging |
2fc68447 | 216 | * |
217 | * This is used to create a struct class pointer that can then be used | |
c3b19ff0 | 218 | * in calls to device_create(). |
2fc68447 | 219 | * |
220 | * Note, the pointer created here is to be destroyed when finished by | |
221 | * making a call to class_destroy(). | |
222 | */ | |
d2a3b914 MW |
223 | struct class *__class_create(struct module *owner, const char *name, |
224 | struct lock_class_key *key) | |
e9ba6365 | 225 | { |
226 | struct class *cls; | |
227 | int retval; | |
228 | ||
4aed0644 | 229 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 | 230 | if (!cls) { |
231 | retval = -ENOMEM; | |
232 | goto error; | |
233 | } | |
e9ba6365 | 234 | |
235 | cls->name = name; | |
236 | cls->owner = owner; | |
237 | cls->class_release = class_create_release; | |
e9ba6365 | 238 | |
d2a3b914 | 239 | retval = __class_register(cls, key); |
e9ba6365 | 240 | if (retval) |
241 | goto error; | |
242 | ||
243 | return cls; | |
244 | ||
245 | error: | |
246 | kfree(cls); | |
247 | return ERR_PTR(retval); | |
248 | } | |
d2a3b914 | 249 | EXPORT_SYMBOL_GPL(__class_create); |
e9ba6365 | 250 | |
2fc68447 | 251 | /** |
252 | * class_destroy - destroys a struct class structure | |
92a0f861 | 253 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 | 254 | * |
255 | * Note, the pointer to be destroyed must have been created with a call | |
256 | * to class_create(). | |
257 | */ | |
e9ba6365 | 258 | void class_destroy(struct class *cls) |
259 | { | |
260 | if ((cls == NULL) || (IS_ERR(cls))) | |
261 | return; | |
262 | ||
263 | class_unregister(cls); | |
264 | } | |
1da177e4 | 265 | |
805fab47 KS |
266 | #ifdef CONFIG_SYSFS_DEPRECATED |
267 | char *make_class_name(const char *name, struct kobject *kobj) | |
268 | { | |
269 | char *class_name; | |
270 | int size; | |
271 | ||
272 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
273 | ||
274 | class_name = kmalloc(size, GFP_KERNEL); | |
275 | if (!class_name) | |
cb360bbf | 276 | return NULL; |
805fab47 KS |
277 | |
278 | strcpy(class_name, name); | |
279 | strcat(class_name, ":"); | |
280 | strcat(class_name, kobject_name(kobj)); | |
281 | return class_name; | |
282 | } | |
805fab47 KS |
283 | #endif |
284 | ||
5a3ceb86 TH |
285 | /** |
286 | * class_dev_iter_init - initialize class device iterator | |
287 | * @iter: class iterator to initialize | |
288 | * @class: the class we wanna iterate over | |
289 | * @start: the device to start iterating from, if any | |
290 | * @type: device_type of the devices to iterate over, NULL for all | |
291 | * | |
292 | * Initialize class iterator @iter such that it iterates over devices | |
293 | * of @class. If @start is set, the list iteration will start there, | |
294 | * otherwise if it is NULL, the iteration starts at the beginning of | |
295 | * the list. | |
296 | */ | |
297 | void class_dev_iter_init(struct class_dev_iter *iter, struct class *class, | |
298 | struct device *start, const struct device_type *type) | |
299 | { | |
300 | struct klist_node *start_knode = NULL; | |
301 | ||
302 | if (start) | |
303 | start_knode = &start->knode_class; | |
304 | klist_iter_init_node(&class->p->class_devices, &iter->ki, start_knode); | |
305 | iter->type = type; | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(class_dev_iter_init); | |
308 | ||
309 | /** | |
310 | * class_dev_iter_next - iterate to the next device | |
311 | * @iter: class iterator to proceed | |
312 | * | |
313 | * Proceed @iter to the next device and return it. Returns NULL if | |
314 | * iteration is complete. | |
315 | * | |
316 | * The returned device is referenced and won't be released till | |
317 | * iterator is proceed to the next device or exited. The caller is | |
318 | * free to do whatever it wants to do with the device including | |
319 | * calling back into class code. | |
320 | */ | |
321 | struct device *class_dev_iter_next(struct class_dev_iter *iter) | |
322 | { | |
323 | struct klist_node *knode; | |
324 | struct device *dev; | |
325 | ||
326 | while (1) { | |
327 | knode = klist_next(&iter->ki); | |
328 | if (!knode) | |
329 | return NULL; | |
330 | dev = container_of(knode, struct device, knode_class); | |
331 | if (!iter->type || iter->type == dev->type) | |
332 | return dev; | |
333 | } | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(class_dev_iter_next); | |
336 | ||
337 | /** | |
338 | * class_dev_iter_exit - finish iteration | |
339 | * @iter: class iterator to finish | |
340 | * | |
341 | * Finish an iteration. Always call this function after iteration is | |
342 | * complete whether the iteration ran till the end or not. | |
343 | */ | |
344 | void class_dev_iter_exit(struct class_dev_iter *iter) | |
345 | { | |
346 | klist_iter_exit(&iter->ki); | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(class_dev_iter_exit); | |
349 | ||
fd04897b DY |
350 | /** |
351 | * class_for_each_device - device iterator | |
352 | * @class: the class we're iterating | |
93562b53 | 353 | * @start: the device to start with in the list, if any. |
fd04897b DY |
354 | * @data: data for the callback |
355 | * @fn: function to be called for each device | |
356 | * | |
357 | * Iterate over @class's list of devices, and call @fn for each, | |
93562b53 GKH |
358 | * passing it @data. If @start is set, the list iteration will start |
359 | * there, otherwise if it is NULL, the iteration starts at the | |
360 | * beginning of the list. | |
fd04897b DY |
361 | * |
362 | * We check the return of @fn each time. If it returns anything | |
363 | * other than 0, we break out and return that value. | |
364 | * | |
5a3ceb86 TH |
365 | * @fn is allowed to do anything including calling back into class |
366 | * code. There's no locking restriction. | |
fd04897b | 367 | */ |
93562b53 GKH |
368 | int class_for_each_device(struct class *class, struct device *start, |
369 | void *data, int (*fn)(struct device *, void *)) | |
fd04897b | 370 | { |
5a3ceb86 | 371 | struct class_dev_iter iter; |
fd04897b DY |
372 | struct device *dev; |
373 | int error = 0; | |
374 | ||
375 | if (!class) | |
376 | return -EINVAL; | |
7c225035 DB |
377 | if (!class->p) { |
378 | WARN(1, "%s called for class '%s' before it was initialized", | |
379 | __func__, class->name); | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
5a3ceb86 TH |
383 | class_dev_iter_init(&iter, class, start, NULL); |
384 | while ((dev = class_dev_iter_next(&iter))) { | |
93562b53 | 385 | error = fn(dev, data); |
fd04897b DY |
386 | if (error) |
387 | break; | |
388 | } | |
5a3ceb86 | 389 | class_dev_iter_exit(&iter); |
fd04897b DY |
390 | |
391 | return error; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(class_for_each_device); | |
394 | ||
395 | /** | |
396 | * class_find_device - device iterator for locating a particular device | |
397 | * @class: the class we're iterating | |
695794ae | 398 | * @start: Device to begin with |
fd04897b DY |
399 | * @data: data for the match function |
400 | * @match: function to check device | |
401 | * | |
402 | * This is similar to the class_for_each_dev() function above, but it | |
403 | * returns a reference to a device that is 'found' for later use, as | |
404 | * determined by the @match callback. | |
405 | * | |
406 | * The callback should return 0 if the device doesn't match and non-zero | |
407 | * if it does. If the callback returns non-zero, this function will | |
408 | * return to the caller and not iterate over any more devices. | |
a63ca8f6 | 409 | * |
fd04897b DY |
410 | * Note, you will need to drop the reference with put_device() after use. |
411 | * | |
5a3ceb86 TH |
412 | * @fn is allowed to do anything including calling back into class |
413 | * code. There's no locking restriction. | |
fd04897b | 414 | */ |
695794ae GKH |
415 | struct device *class_find_device(struct class *class, struct device *start, |
416 | void *data, | |
417 | int (*match)(struct device *, void *)) | |
fd04897b | 418 | { |
5a3ceb86 | 419 | struct class_dev_iter iter; |
fd04897b | 420 | struct device *dev; |
fd04897b DY |
421 | |
422 | if (!class) | |
423 | return NULL; | |
7c225035 DB |
424 | if (!class->p) { |
425 | WARN(1, "%s called for class '%s' before it was initialized", | |
426 | __func__, class->name); | |
427 | return NULL; | |
428 | } | |
fd04897b | 429 | |
5a3ceb86 TH |
430 | class_dev_iter_init(&iter, class, start, NULL); |
431 | while ((dev = class_dev_iter_next(&iter))) { | |
695794ae | 432 | if (match(dev, data)) { |
5a3ceb86 | 433 | get_device(dev); |
fd04897b | 434 | break; |
5a3ceb86 | 435 | } |
fd04897b | 436 | } |
5a3ceb86 | 437 | class_dev_iter_exit(&iter); |
fd04897b | 438 | |
5a3ceb86 | 439 | return dev; |
fd04897b DY |
440 | } |
441 | EXPORT_SYMBOL_GPL(class_find_device); | |
442 | ||
1da177e4 LT |
443 | int class_interface_register(struct class_interface *class_intf) |
444 | { | |
445 | struct class *parent; | |
5a3ceb86 | 446 | struct class_dev_iter iter; |
c47ed219 | 447 | struct device *dev; |
1da177e4 LT |
448 | |
449 | if (!class_intf || !class_intf->class) | |
450 | return -ENODEV; | |
451 | ||
452 | parent = class_get(class_intf->class); | |
453 | if (!parent) | |
454 | return -EINVAL; | |
455 | ||
f75b1c60 | 456 | mutex_lock(&parent->p->class_mutex); |
184f1f77 | 457 | list_add_tail(&class_intf->node, &parent->p->class_interfaces); |
c47ed219 | 458 | if (class_intf->add_dev) { |
5a3ceb86 TH |
459 | class_dev_iter_init(&iter, parent, NULL, NULL); |
460 | while ((dev = class_dev_iter_next(&iter))) | |
c47ed219 | 461 | class_intf->add_dev(dev, class_intf); |
5a3ceb86 | 462 | class_dev_iter_exit(&iter); |
c47ed219 | 463 | } |
f75b1c60 | 464 | mutex_unlock(&parent->p->class_mutex); |
1da177e4 LT |
465 | |
466 | return 0; | |
467 | } | |
468 | ||
469 | void class_interface_unregister(struct class_interface *class_intf) | |
470 | { | |
4a3ad20c | 471 | struct class *parent = class_intf->class; |
5a3ceb86 | 472 | struct class_dev_iter iter; |
c47ed219 | 473 | struct device *dev; |
1da177e4 LT |
474 | |
475 | if (!parent) | |
476 | return; | |
477 | ||
f75b1c60 | 478 | mutex_lock(&parent->p->class_mutex); |
1da177e4 | 479 | list_del_init(&class_intf->node); |
c47ed219 | 480 | if (class_intf->remove_dev) { |
5a3ceb86 TH |
481 | class_dev_iter_init(&iter, parent, NULL, NULL); |
482 | while ((dev = class_dev_iter_next(&iter))) | |
c47ed219 | 483 | class_intf->remove_dev(dev, class_intf); |
5a3ceb86 | 484 | class_dev_iter_exit(&iter); |
c47ed219 | 485 | } |
f75b1c60 | 486 | mutex_unlock(&parent->p->class_mutex); |
1da177e4 LT |
487 | |
488 | class_put(parent); | |
489 | } | |
490 | ||
46227094 JD |
491 | struct class_compat { |
492 | struct kobject *kobj; | |
493 | }; | |
494 | ||
495 | /** | |
496 | * class_compat_register - register a compatibility class | |
497 | * @name: the name of the class | |
498 | * | |
499 | * Compatibility class are meant as a temporary user-space compatibility | |
500 | * workaround when converting a family of class devices to a bus devices. | |
501 | */ | |
502 | struct class_compat *class_compat_register(const char *name) | |
503 | { | |
504 | struct class_compat *cls; | |
505 | ||
506 | cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL); | |
507 | if (!cls) | |
508 | return NULL; | |
509 | cls->kobj = kobject_create_and_add(name, &class_kset->kobj); | |
510 | if (!cls->kobj) { | |
511 | kfree(cls); | |
512 | return NULL; | |
513 | } | |
514 | return cls; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(class_compat_register); | |
517 | ||
518 | /** | |
519 | * class_compat_unregister - unregister a compatibility class | |
520 | * @cls: the class to unregister | |
521 | */ | |
522 | void class_compat_unregister(struct class_compat *cls) | |
523 | { | |
524 | kobject_put(cls->kobj); | |
525 | kfree(cls); | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(class_compat_unregister); | |
528 | ||
529 | /** | |
530 | * class_compat_create_link - create a compatibility class device link to | |
531 | * a bus device | |
532 | * @cls: the compatibility class | |
533 | * @dev: the target bus device | |
534 | * @device_link: an optional device to which a "device" link should be created | |
535 | */ | |
536 | int class_compat_create_link(struct class_compat *cls, struct device *dev, | |
537 | struct device *device_link) | |
538 | { | |
539 | int error; | |
540 | ||
541 | error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev)); | |
542 | if (error) | |
543 | return error; | |
544 | ||
545 | /* | |
546 | * Optionally add a "device" link (typically to the parent), as a | |
547 | * class device would have one and we want to provide as much | |
548 | * backwards compatibility as possible. | |
549 | */ | |
550 | if (device_link) { | |
551 | error = sysfs_create_link(&dev->kobj, &device_link->kobj, | |
552 | "device"); | |
553 | if (error) | |
554 | sysfs_remove_link(cls->kobj, dev_name(dev)); | |
555 | } | |
556 | ||
557 | return error; | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(class_compat_create_link); | |
560 | ||
561 | /** | |
562 | * class_compat_remove_link - remove a compatibility class device link to | |
563 | * a bus device | |
564 | * @cls: the compatibility class | |
565 | * @dev: the target bus device | |
566 | * @device_link: an optional device to which a "device" link was previously | |
567 | * created | |
568 | */ | |
569 | void class_compat_remove_link(struct class_compat *cls, struct device *dev, | |
570 | struct device *device_link) | |
571 | { | |
572 | if (device_link) | |
573 | sysfs_remove_link(&dev->kobj, "device"); | |
574 | sysfs_remove_link(cls->kobj, dev_name(dev)); | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(class_compat_remove_link); | |
577 | ||
1da177e4 LT |
578 | int __init classes_init(void) |
579 | { | |
443dbf90 GKH |
580 | class_kset = kset_create_and_add("class", NULL, NULL); |
581 | if (!class_kset) | |
582 | return -ENOMEM; | |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
586 | EXPORT_SYMBOL_GPL(class_create_file); | |
587 | EXPORT_SYMBOL_GPL(class_remove_file); | |
1da177e4 | 588 | EXPORT_SYMBOL_GPL(class_unregister); |
e9ba6365 | 589 | EXPORT_SYMBOL_GPL(class_destroy); |
1da177e4 | 590 | |
1da177e4 LT |
591 | EXPORT_SYMBOL_GPL(class_interface_register); |
592 | EXPORT_SYMBOL_GPL(class_interface_unregister); |