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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kobject.c - library routines for handling generic kernel objects | |
3 | * | |
4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | * | |
8 | * | |
9 | * Please see the file Documentation/kobject.txt for critical information | |
10 | * about using the kobject interface. | |
11 | */ | |
12 | ||
13 | #include <linux/kobject.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/stat.h> | |
4e57b681 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | |
19 | /** | |
20 | * populate_dir - populate directory with attributes. | |
21 | * @kobj: object we're working on. | |
22 | * | |
23 | * Most subsystems have a set of default attributes that | |
24 | * are associated with an object that registers with them. | |
25 | * This is a helper called during object registration that | |
26 | * loops through the default attributes of the subsystem | |
27 | * and creates attributes files for them in sysfs. | |
28 | * | |
29 | */ | |
30 | ||
31 | static int populate_dir(struct kobject * kobj) | |
32 | { | |
33 | struct kobj_type * t = get_ktype(kobj); | |
34 | struct attribute * attr; | |
35 | int error = 0; | |
36 | int i; | |
37 | ||
38 | if (t && t->default_attrs) { | |
39 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
40 | if ((error = sysfs_create_file(kobj,attr))) | |
41 | break; | |
42 | } | |
43 | } | |
44 | return error; | |
45 | } | |
46 | ||
b592fcfe | 47 | static int create_dir(struct kobject * kobj, struct dentry *shadow_parent) |
1da177e4 LT |
48 | { |
49 | int error = 0; | |
50 | if (kobject_name(kobj)) { | |
b592fcfe | 51 | error = sysfs_create_dir(kobj, shadow_parent); |
1da177e4 LT |
52 | if (!error) { |
53 | if ((error = populate_dir(kobj))) | |
54 | sysfs_remove_dir(kobj); | |
55 | } | |
56 | } | |
57 | return error; | |
58 | } | |
59 | ||
60 | static inline struct kobject * to_kobj(struct list_head * entry) | |
61 | { | |
62 | return container_of(entry,struct kobject,entry); | |
63 | } | |
64 | ||
65 | static int get_kobj_path_length(struct kobject *kobj) | |
66 | { | |
67 | int length = 1; | |
68 | struct kobject * parent = kobj; | |
69 | ||
70 | /* walk up the ancestors until we hit the one pointing to the | |
71 | * root. | |
72 | * Add 1 to strlen for leading '/' of each level. | |
73 | */ | |
74 | do { | |
b365b3da CE |
75 | if (kobject_name(parent) == NULL) |
76 | return 0; | |
1da177e4 LT |
77 | length += strlen(kobject_name(parent)) + 1; |
78 | parent = parent->parent; | |
79 | } while (parent); | |
80 | return length; | |
81 | } | |
82 | ||
83 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
84 | { | |
85 | struct kobject * parent; | |
86 | ||
87 | --length; | |
88 | for (parent = kobj; parent; parent = parent->parent) { | |
89 | int cur = strlen(kobject_name(parent)); | |
90 | /* back up enough to print this name with '/' */ | |
91 | length -= cur; | |
92 | strncpy (path + length, kobject_name(parent), cur); | |
93 | *(path + --length) = '/'; | |
94 | } | |
95 | ||
96 | pr_debug("%s: path = '%s'\n",__FUNCTION__,path); | |
97 | } | |
98 | ||
99 | /** | |
72fd4a35 | 100 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
101 | * |
102 | * @kobj: kobject in question, with which to build the path | |
103 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
104 | * |
105 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 106 | */ |
fd4f2df2 | 107 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
108 | { |
109 | char *path; | |
110 | int len; | |
111 | ||
112 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
113 | if (len == 0) |
114 | return NULL; | |
4668edc3 | 115 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
116 | if (!path) |
117 | return NULL; | |
1da177e4 LT |
118 | fill_kobj_path(kobj, path, len); |
119 | ||
120 | return path; | |
121 | } | |
80fc9f53 | 122 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 LT |
123 | |
124 | /** | |
125 | * kobject_init - initialize object. | |
126 | * @kobj: object in question. | |
127 | */ | |
128 | void kobject_init(struct kobject * kobj) | |
129 | { | |
31b9025a GKH |
130 | if (!kobj) |
131 | return; | |
1da177e4 LT |
132 | kref_init(&kobj->kref); |
133 | INIT_LIST_HEAD(&kobj->entry); | |
4508a7a7 | 134 | init_waitqueue_head(&kobj->poll); |
1da177e4 LT |
135 | kobj->kset = kset_get(kobj->kset); |
136 | } | |
137 | ||
138 | ||
139 | /** | |
140 | * unlink - remove kobject from kset list. | |
141 | * @kobj: kobject. | |
142 | * | |
143 | * Remove the kobject from the kset list and decrement | |
144 | * its parent's refcount. | |
145 | * This is separated out, so we can use it in both | |
146 | * kobject_del() and kobject_add() on error. | |
147 | */ | |
148 | ||
149 | static void unlink(struct kobject * kobj) | |
150 | { | |
151 | if (kobj->kset) { | |
152 | spin_lock(&kobj->kset->list_lock); | |
153 | list_del_init(&kobj->entry); | |
154 | spin_unlock(&kobj->kset->list_lock); | |
155 | } | |
156 | kobject_put(kobj); | |
157 | } | |
158 | ||
159 | /** | |
460f7e9a | 160 | * kobject_shadow_add - add an object to the hierarchy. |
1da177e4 | 161 | * @kobj: object. |
b592fcfe | 162 | * @shadow_parent: sysfs directory to add to. |
1da177e4 LT |
163 | */ |
164 | ||
b592fcfe | 165 | int kobject_shadow_add(struct kobject * kobj, struct dentry *shadow_parent) |
1da177e4 LT |
166 | { |
167 | int error = 0; | |
168 | struct kobject * parent; | |
169 | ||
170 | if (!(kobj = kobject_get(kobj))) | |
171 | return -ENOENT; | |
172 | if (!kobj->k_name) | |
173 | kobj->k_name = kobj->name; | |
13507701 | 174 | if (!*kobj->k_name) { |
c171fef5 GKH |
175 | pr_debug("kobject attempted to be registered with no name!\n"); |
176 | WARN_ON(1); | |
88db4721 | 177 | kobject_put(kobj); |
c171fef5 GKH |
178 | return -EINVAL; |
179 | } | |
1da177e4 LT |
180 | parent = kobject_get(kobj->parent); |
181 | ||
182 | pr_debug("kobject %s: registering. parent: %s, set: %s\n", | |
183 | kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", | |
184 | kobj->kset ? kobj->kset->kobj.name : "<NULL>" ); | |
185 | ||
186 | if (kobj->kset) { | |
187 | spin_lock(&kobj->kset->list_lock); | |
188 | ||
189 | if (!parent) | |
190 | parent = kobject_get(&kobj->kset->kobj); | |
191 | ||
192 | list_add_tail(&kobj->entry,&kobj->kset->list); | |
193 | spin_unlock(&kobj->kset->list_lock); | |
460f7e9a | 194 | kobj->parent = parent; |
1da177e4 | 195 | } |
1da177e4 | 196 | |
b592fcfe | 197 | error = create_dir(kobj, shadow_parent); |
1da177e4 LT |
198 | if (error) { |
199 | /* unlink does the kobject_put() for us */ | |
200 | unlink(kobj); | |
b067db49 | 201 | kobject_put(parent); |
dcd0da00 GKH |
202 | |
203 | /* be noisy on error issues */ | |
204 | if (error == -EEXIST) | |
5c73a3fb GKH |
205 | printk(KERN_ERR "kobject_add failed for %s with " |
206 | "-EEXIST, don't try to register things with " | |
207 | "the same name in the same directory.\n", | |
dcd0da00 GKH |
208 | kobject_name(kobj)); |
209 | else | |
5c73a3fb | 210 | printk(KERN_ERR "kobject_add failed for %s (%d)\n", |
dcd0da00 | 211 | kobject_name(kobj), error); |
5c73a3fb | 212 | dump_stack(); |
1da177e4 LT |
213 | } |
214 | ||
215 | return error; | |
216 | } | |
217 | ||
b592fcfe EB |
218 | /** |
219 | * kobject_add - add an object to the hierarchy. | |
220 | * @kobj: object. | |
221 | */ | |
222 | int kobject_add(struct kobject * kobj) | |
223 | { | |
224 | return kobject_shadow_add(kobj, NULL); | |
225 | } | |
226 | ||
1da177e4 LT |
227 | |
228 | /** | |
229 | * kobject_register - initialize and add an object. | |
230 | * @kobj: object in question. | |
231 | */ | |
232 | ||
233 | int kobject_register(struct kobject * kobj) | |
234 | { | |
dcd0da00 | 235 | int error = -EINVAL; |
1da177e4 LT |
236 | if (kobj) { |
237 | kobject_init(kobj); | |
238 | error = kobject_add(kobj); | |
dcd0da00 | 239 | if (!error) |
312c004d | 240 | kobject_uevent(kobj, KOBJ_ADD); |
dcd0da00 | 241 | } |
1da177e4 LT |
242 | return error; |
243 | } | |
244 | ||
245 | ||
246 | /** | |
247 | * kobject_set_name - Set the name of an object | |
248 | * @kobj: object. | |
67be2dd1 | 249 | * @fmt: format string used to build the name |
1da177e4 LT |
250 | * |
251 | * If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated | |
252 | * string that @kobj->k_name points to. Otherwise, use the static | |
253 | * @kobj->name array. | |
254 | */ | |
1da177e4 LT |
255 | int kobject_set_name(struct kobject * kobj, const char * fmt, ...) |
256 | { | |
257 | int error = 0; | |
258 | int limit = KOBJ_NAME_LEN; | |
259 | int need; | |
260 | va_list args; | |
261 | char * name; | |
262 | ||
263 | /* | |
264 | * First, try the static array | |
265 | */ | |
266 | va_start(args,fmt); | |
267 | need = vsnprintf(kobj->name,limit,fmt,args); | |
268 | va_end(args); | |
269 | if (need < limit) | |
270 | name = kobj->name; | |
271 | else { | |
272 | /* | |
273 | * Need more space? Allocate it and try again | |
274 | */ | |
275 | limit = need + 1; | |
276 | name = kmalloc(limit,GFP_KERNEL); | |
277 | if (!name) { | |
278 | error = -ENOMEM; | |
279 | goto Done; | |
280 | } | |
281 | va_start(args,fmt); | |
282 | need = vsnprintf(name,limit,fmt,args); | |
283 | va_end(args); | |
284 | ||
285 | /* Still? Give up. */ | |
286 | if (need >= limit) { | |
287 | kfree(name); | |
288 | error = -EFAULT; | |
289 | goto Done; | |
290 | } | |
291 | } | |
292 | ||
293 | /* Free the old name, if necessary. */ | |
294 | if (kobj->k_name && kobj->k_name != kobj->name) | |
295 | kfree(kobj->k_name); | |
296 | ||
297 | /* Now, set the new name */ | |
298 | kobj->k_name = name; | |
299 | Done: | |
300 | return error; | |
301 | } | |
302 | ||
303 | EXPORT_SYMBOL(kobject_set_name); | |
304 | ||
305 | ||
306 | /** | |
307 | * kobject_rename - change the name of an object | |
308 | * @kobj: object in question. | |
309 | * @new_name: object's new name | |
310 | */ | |
311 | ||
f3b4f3c6 | 312 | int kobject_rename(struct kobject * kobj, const char *new_name) |
1da177e4 LT |
313 | { |
314 | int error = 0; | |
ca2f37db JT |
315 | const char *devpath = NULL; |
316 | char *devpath_string = NULL; | |
317 | char *envp[2]; | |
1da177e4 LT |
318 | |
319 | kobj = kobject_get(kobj); | |
320 | if (!kobj) | |
321 | return -EINVAL; | |
b592fcfe EB |
322 | if (!kobj->parent) |
323 | return -EINVAL; | |
ca2f37db JT |
324 | |
325 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
326 | if (!devpath) { | |
327 | error = -ENOMEM; | |
328 | goto out; | |
329 | } | |
330 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
331 | if (!devpath_string) { | |
332 | error = -ENOMEM; | |
333 | goto out; | |
334 | } | |
335 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
336 | envp[0] = devpath_string; | |
337 | envp[1] = NULL; | |
338 | /* Note : if we want to send the new name alone, not the full path, | |
339 | * we could probably use kobject_name(kobj); */ | |
340 | ||
b592fcfe | 341 | error = sysfs_rename_dir(kobj, kobj->parent->dentry, new_name); |
ca2f37db JT |
342 | |
343 | /* This function is mostly/only used for network interface. | |
344 | * Some hotplug package track interfaces by their name and | |
345 | * therefore want to know when the name is changed by the user. */ | |
346 | if (!error) | |
347 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
348 | ||
349 | out: | |
350 | kfree(devpath_string); | |
351 | kfree(devpath); | |
b592fcfe EB |
352 | kobject_put(kobj); |
353 | ||
354 | return error; | |
355 | } | |
356 | ||
357 | /** | |
358 | * kobject_rename - change the name of an object | |
359 | * @kobj: object in question. | |
f95d882d | 360 | * @new_parent: object's new parent |
b592fcfe EB |
361 | * @new_name: object's new name |
362 | */ | |
363 | ||
364 | int kobject_shadow_rename(struct kobject * kobj, struct dentry *new_parent, | |
365 | const char *new_name) | |
366 | { | |
367 | int error = 0; | |
368 | ||
369 | kobj = kobject_get(kobj); | |
370 | if (!kobj) | |
371 | return -EINVAL; | |
372 | error = sysfs_rename_dir(kobj, new_parent, new_name); | |
1da177e4 LT |
373 | kobject_put(kobj); |
374 | ||
375 | return error; | |
376 | } | |
377 | ||
8a82472f CH |
378 | /** |
379 | * kobject_move - move object to another parent | |
380 | * @kobj: object in question. | |
c744aeae | 381 | * @new_parent: object's new parent (can be NULL) |
8a82472f CH |
382 | */ |
383 | ||
384 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) | |
385 | { | |
386 | int error; | |
387 | struct kobject *old_parent; | |
388 | const char *devpath = NULL; | |
389 | char *devpath_string = NULL; | |
390 | char *envp[2]; | |
391 | ||
392 | kobj = kobject_get(kobj); | |
393 | if (!kobj) | |
394 | return -EINVAL; | |
395 | new_parent = kobject_get(new_parent); | |
396 | if (!new_parent) { | |
c744aeae CH |
397 | if (kobj->kset) |
398 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f CH |
399 | } |
400 | /* old object path */ | |
401 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
402 | if (!devpath) { | |
403 | error = -ENOMEM; | |
404 | goto out; | |
405 | } | |
406 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
407 | if (!devpath_string) { | |
408 | error = -ENOMEM; | |
409 | goto out; | |
410 | } | |
411 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
412 | envp[0] = devpath_string; | |
413 | envp[1] = NULL; | |
414 | error = sysfs_move_dir(kobj, new_parent); | |
415 | if (error) | |
416 | goto out; | |
417 | old_parent = kobj->parent; | |
418 | kobj->parent = new_parent; | |
9e993efb | 419 | new_parent = NULL; |
8a82472f CH |
420 | kobject_put(old_parent); |
421 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
422 | out: | |
9e993efb | 423 | kobject_put(new_parent); |
8a82472f CH |
424 | kobject_put(kobj); |
425 | kfree(devpath_string); | |
426 | kfree(devpath); | |
427 | return error; | |
428 | } | |
429 | ||
1da177e4 LT |
430 | /** |
431 | * kobject_del - unlink kobject from hierarchy. | |
432 | * @kobj: object. | |
433 | */ | |
434 | ||
435 | void kobject_del(struct kobject * kobj) | |
436 | { | |
31b9025a GKH |
437 | if (!kobj) |
438 | return; | |
1da177e4 LT |
439 | sysfs_remove_dir(kobj); |
440 | unlink(kobj); | |
441 | } | |
442 | ||
443 | /** | |
444 | * kobject_unregister - remove object from hierarchy and decrement refcount. | |
445 | * @kobj: object going away. | |
446 | */ | |
447 | ||
448 | void kobject_unregister(struct kobject * kobj) | |
449 | { | |
31b9025a GKH |
450 | if (!kobj) |
451 | return; | |
1da177e4 | 452 | pr_debug("kobject %s: unregistering\n",kobject_name(kobj)); |
312c004d | 453 | kobject_uevent(kobj, KOBJ_REMOVE); |
1da177e4 LT |
454 | kobject_del(kobj); |
455 | kobject_put(kobj); | |
456 | } | |
457 | ||
458 | /** | |
459 | * kobject_get - increment refcount for object. | |
460 | * @kobj: object. | |
461 | */ | |
462 | ||
463 | struct kobject * kobject_get(struct kobject * kobj) | |
464 | { | |
465 | if (kobj) | |
466 | kref_get(&kobj->kref); | |
467 | return kobj; | |
468 | } | |
469 | ||
470 | /** | |
471 | * kobject_cleanup - free kobject resources. | |
472 | * @kobj: object. | |
473 | */ | |
474 | ||
475 | void kobject_cleanup(struct kobject * kobj) | |
476 | { | |
477 | struct kobj_type * t = get_ktype(kobj); | |
478 | struct kset * s = kobj->kset; | |
479 | struct kobject * parent = kobj->parent; | |
480 | ||
481 | pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); | |
482 | if (kobj->k_name != kobj->name) | |
483 | kfree(kobj->k_name); | |
484 | kobj->k_name = NULL; | |
485 | if (t && t->release) | |
486 | t->release(kobj); | |
487 | if (s) | |
488 | kset_put(s); | |
b067db49 | 489 | kobject_put(parent); |
1da177e4 LT |
490 | } |
491 | ||
492 | static void kobject_release(struct kref *kref) | |
493 | { | |
494 | kobject_cleanup(container_of(kref, struct kobject, kref)); | |
495 | } | |
496 | ||
497 | /** | |
498 | * kobject_put - decrement refcount for object. | |
499 | * @kobj: object. | |
500 | * | |
501 | * Decrement the refcount, and if 0, call kobject_cleanup(). | |
502 | */ | |
503 | void kobject_put(struct kobject * kobj) | |
504 | { | |
505 | if (kobj) | |
506 | kref_put(&kobj->kref, kobject_release); | |
507 | } | |
508 | ||
509 | ||
7423172a JN |
510 | static void dir_release(struct kobject *kobj) |
511 | { | |
512 | kfree(kobj); | |
513 | } | |
514 | ||
515 | static struct kobj_type dir_ktype = { | |
516 | .release = dir_release, | |
517 | .sysfs_ops = NULL, | |
518 | .default_attrs = NULL, | |
519 | }; | |
520 | ||
521 | /** | |
2753133e | 522 | * kobject_kset_add_dir - add sub directory of object. |
86406245 | 523 | * @kset: kset the directory is belongs to. |
7423172a JN |
524 | * @parent: object in which a directory is created. |
525 | * @name: directory name. | |
526 | * | |
527 | * Add a plain directory object as child of given object. | |
528 | */ | |
86406245 KS |
529 | struct kobject *kobject_kset_add_dir(struct kset *kset, |
530 | struct kobject *parent, const char *name) | |
7423172a JN |
531 | { |
532 | struct kobject *k; | |
10188012 | 533 | int ret; |
7423172a JN |
534 | |
535 | if (!parent) | |
536 | return NULL; | |
537 | ||
538 | k = kzalloc(sizeof(*k), GFP_KERNEL); | |
539 | if (!k) | |
540 | return NULL; | |
541 | ||
86406245 | 542 | k->kset = kset; |
7423172a JN |
543 | k->parent = parent; |
544 | k->ktype = &dir_ktype; | |
545 | kobject_set_name(k, name); | |
10188012 RD |
546 | ret = kobject_register(k); |
547 | if (ret < 0) { | |
2753133e EB |
548 | printk(KERN_WARNING "%s: kobject_register error: %d\n", |
549 | __func__, ret); | |
10188012 RD |
550 | kobject_del(k); |
551 | return NULL; | |
552 | } | |
7423172a JN |
553 | |
554 | return k; | |
555 | } | |
7423172a | 556 | |
2753133e EB |
557 | /** |
558 | * kobject_add_dir - add sub directory of object. | |
559 | * @parent: object in which a directory is created. | |
560 | * @name: directory name. | |
561 | * | |
562 | * Add a plain directory object as child of given object. | |
563 | */ | |
86406245 KS |
564 | struct kobject *kobject_add_dir(struct kobject *parent, const char *name) |
565 | { | |
566 | return kobject_kset_add_dir(NULL, parent, name); | |
567 | } | |
568 | ||
1da177e4 LT |
569 | /** |
570 | * kset_init - initialize a kset for use | |
571 | * @k: kset | |
572 | */ | |
573 | ||
574 | void kset_init(struct kset * k) | |
575 | { | |
576 | kobject_init(&k->kobj); | |
577 | INIT_LIST_HEAD(&k->list); | |
578 | spin_lock_init(&k->list_lock); | |
579 | } | |
580 | ||
581 | ||
582 | /** | |
583 | * kset_add - add a kset object to the hierarchy. | |
584 | * @k: kset. | |
1da177e4 LT |
585 | */ |
586 | ||
587 | int kset_add(struct kset * k) | |
588 | { | |
1da177e4 LT |
589 | return kobject_add(&k->kobj); |
590 | } | |
591 | ||
592 | ||
593 | /** | |
594 | * kset_register - initialize and add a kset. | |
595 | * @k: kset. | |
596 | */ | |
597 | ||
598 | int kset_register(struct kset * k) | |
599 | { | |
31b9025a GKH |
600 | if (!k) |
601 | return -EINVAL; | |
1da177e4 LT |
602 | kset_init(k); |
603 | return kset_add(k); | |
604 | } | |
605 | ||
606 | ||
607 | /** | |
608 | * kset_unregister - remove a kset. | |
609 | * @k: kset. | |
610 | */ | |
611 | ||
612 | void kset_unregister(struct kset * k) | |
613 | { | |
31b9025a GKH |
614 | if (!k) |
615 | return; | |
1da177e4 LT |
616 | kobject_unregister(&k->kobj); |
617 | } | |
618 | ||
619 | ||
620 | /** | |
621 | * kset_find_obj - search for object in kset. | |
622 | * @kset: kset we're looking in. | |
623 | * @name: object's name. | |
624 | * | |
625 | * Lock kset via @kset->subsys, and iterate over @kset->list, | |
626 | * looking for a matching kobject. If matching object is found | |
627 | * take a reference and return the object. | |
628 | */ | |
629 | ||
630 | struct kobject * kset_find_obj(struct kset * kset, const char * name) | |
631 | { | |
632 | struct list_head * entry; | |
633 | struct kobject * ret = NULL; | |
634 | ||
635 | spin_lock(&kset->list_lock); | |
636 | list_for_each(entry,&kset->list) { | |
637 | struct kobject * k = to_kobj(entry); | |
638 | if (kobject_name(k) && !strcmp(kobject_name(k),name)) { | |
639 | ret = kobject_get(k); | |
640 | break; | |
641 | } | |
642 | } | |
643 | spin_unlock(&kset->list_lock); | |
644 | return ret; | |
645 | } | |
646 | ||
823bccfc | 647 | void subsystem_init(struct kset *s) |
1da177e4 | 648 | { |
823bccfc | 649 | kset_init(s); |
1da177e4 LT |
650 | } |
651 | ||
823bccfc | 652 | int subsystem_register(struct kset *s) |
1da177e4 | 653 | { |
823bccfc | 654 | return kset_register(s); |
1da177e4 LT |
655 | } |
656 | ||
823bccfc | 657 | void subsystem_unregister(struct kset *s) |
1da177e4 | 658 | { |
823bccfc | 659 | kset_unregister(s); |
1da177e4 LT |
660 | } |
661 | ||
1da177e4 LT |
662 | /** |
663 | * subsystem_create_file - export sysfs attribute file. | |
664 | * @s: subsystem. | |
665 | * @a: subsystem attribute descriptor. | |
666 | */ | |
667 | ||
823bccfc | 668 | int subsys_create_file(struct kset *s, struct subsys_attribute *a) |
1da177e4 LT |
669 | { |
670 | int error = 0; | |
31b9025a GKH |
671 | |
672 | if (!s || !a) | |
673 | return -EINVAL; | |
674 | ||
1da177e4 | 675 | if (subsys_get(s)) { |
823bccfc | 676 | error = sysfs_create_file(&s->kobj, &a->attr); |
1da177e4 LT |
677 | subsys_put(s); |
678 | } | |
679 | return error; | |
680 | } | |
681 | ||
1da177e4 LT |
682 | EXPORT_SYMBOL(kobject_init); |
683 | EXPORT_SYMBOL(kobject_register); | |
684 | EXPORT_SYMBOL(kobject_unregister); | |
685 | EXPORT_SYMBOL(kobject_get); | |
686 | EXPORT_SYMBOL(kobject_put); | |
687 | EXPORT_SYMBOL(kobject_add); | |
688 | EXPORT_SYMBOL(kobject_del); | |
689 | ||
690 | EXPORT_SYMBOL(kset_register); | |
691 | EXPORT_SYMBOL(kset_unregister); | |
1da177e4 | 692 | |
1da177e4 LT |
693 | EXPORT_SYMBOL(subsystem_register); |
694 | EXPORT_SYMBOL(subsystem_unregister); | |
695 | EXPORT_SYMBOL(subsys_create_file); |