Commit | Line | Data |
---|---|---|
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 | /** | |
100 | * kobject_get_path - generate and return the path associated with a given kobj | |
101 | * and kset pair. The result must be freed by the caller with kfree(). | |
102 | * | |
103 | * @kobj: kobject in question, with which to build the path | |
104 | * @gfp_mask: the allocation type used to allocate the path | |
105 | */ | |
fd4f2df2 | 106 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
107 | { |
108 | char *path; | |
109 | int len; | |
110 | ||
111 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
112 | if (len == 0) |
113 | return NULL; | |
4668edc3 | 114 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
115 | if (!path) |
116 | return NULL; | |
1da177e4 LT |
117 | fill_kobj_path(kobj, path, len); |
118 | ||
119 | return path; | |
120 | } | |
80fc9f53 | 121 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 LT |
122 | |
123 | /** | |
124 | * kobject_init - initialize object. | |
125 | * @kobj: object in question. | |
126 | */ | |
127 | void kobject_init(struct kobject * kobj) | |
128 | { | |
31b9025a GKH |
129 | if (!kobj) |
130 | return; | |
1da177e4 LT |
131 | kref_init(&kobj->kref); |
132 | INIT_LIST_HEAD(&kobj->entry); | |
4508a7a7 | 133 | init_waitqueue_head(&kobj->poll); |
1da177e4 LT |
134 | kobj->kset = kset_get(kobj->kset); |
135 | } | |
136 | ||
137 | ||
138 | /** | |
139 | * unlink - remove kobject from kset list. | |
140 | * @kobj: kobject. | |
141 | * | |
142 | * Remove the kobject from the kset list and decrement | |
143 | * its parent's refcount. | |
144 | * This is separated out, so we can use it in both | |
145 | * kobject_del() and kobject_add() on error. | |
146 | */ | |
147 | ||
148 | static void unlink(struct kobject * kobj) | |
149 | { | |
150 | if (kobj->kset) { | |
151 | spin_lock(&kobj->kset->list_lock); | |
152 | list_del_init(&kobj->entry); | |
153 | spin_unlock(&kobj->kset->list_lock); | |
154 | } | |
155 | kobject_put(kobj); | |
156 | } | |
157 | ||
158 | /** | |
159 | * kobject_add - add an object to the hierarchy. | |
160 | * @kobj: object. | |
b592fcfe | 161 | * @shadow_parent: sysfs directory to add to. |
1da177e4 LT |
162 | */ |
163 | ||
b592fcfe | 164 | int kobject_shadow_add(struct kobject * kobj, struct dentry *shadow_parent) |
1da177e4 LT |
165 | { |
166 | int error = 0; | |
167 | struct kobject * parent; | |
168 | ||
169 | if (!(kobj = kobject_get(kobj))) | |
170 | return -ENOENT; | |
171 | if (!kobj->k_name) | |
172 | kobj->k_name = kobj->name; | |
c171fef5 GKH |
173 | if (!kobj->k_name) { |
174 | pr_debug("kobject attempted to be registered with no name!\n"); | |
175 | WARN_ON(1); | |
176 | return -EINVAL; | |
177 | } | |
1da177e4 LT |
178 | parent = kobject_get(kobj->parent); |
179 | ||
180 | pr_debug("kobject %s: registering. parent: %s, set: %s\n", | |
181 | kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", | |
182 | kobj->kset ? kobj->kset->kobj.name : "<NULL>" ); | |
183 | ||
184 | if (kobj->kset) { | |
185 | spin_lock(&kobj->kset->list_lock); | |
186 | ||
187 | if (!parent) | |
188 | parent = kobject_get(&kobj->kset->kobj); | |
189 | ||
190 | list_add_tail(&kobj->entry,&kobj->kset->list); | |
191 | spin_unlock(&kobj->kset->list_lock); | |
192 | } | |
193 | kobj->parent = parent; | |
194 | ||
b592fcfe | 195 | error = create_dir(kobj, shadow_parent); |
1da177e4 LT |
196 | if (error) { |
197 | /* unlink does the kobject_put() for us */ | |
198 | unlink(kobj); | |
b067db49 | 199 | kobject_put(parent); |
dcd0da00 GKH |
200 | |
201 | /* be noisy on error issues */ | |
202 | if (error == -EEXIST) | |
183bd5b3 | 203 | printk("kobject_add failed for %s with -EEXIST, " |
dcd0da00 GKH |
204 | "don't try to register things with the " |
205 | "same name in the same directory.\n", | |
206 | kobject_name(kobj)); | |
207 | else | |
183bd5b3 | 208 | printk("kobject_add failed for %s (%d)\n", |
dcd0da00 | 209 | kobject_name(kobj), error); |
183bd5b3 | 210 | dump_stack(); |
1da177e4 LT |
211 | } |
212 | ||
213 | return error; | |
214 | } | |
215 | ||
b592fcfe EB |
216 | /** |
217 | * kobject_add - add an object to the hierarchy. | |
218 | * @kobj: object. | |
219 | */ | |
220 | int kobject_add(struct kobject * kobj) | |
221 | { | |
222 | return kobject_shadow_add(kobj, NULL); | |
223 | } | |
224 | ||
1da177e4 LT |
225 | |
226 | /** | |
227 | * kobject_register - initialize and add an object. | |
228 | * @kobj: object in question. | |
229 | */ | |
230 | ||
231 | int kobject_register(struct kobject * kobj) | |
232 | { | |
dcd0da00 | 233 | int error = -EINVAL; |
1da177e4 LT |
234 | if (kobj) { |
235 | kobject_init(kobj); | |
236 | error = kobject_add(kobj); | |
dcd0da00 | 237 | if (!error) |
312c004d | 238 | kobject_uevent(kobj, KOBJ_ADD); |
dcd0da00 | 239 | } |
1da177e4 LT |
240 | return error; |
241 | } | |
242 | ||
243 | ||
244 | /** | |
245 | * kobject_set_name - Set the name of an object | |
246 | * @kobj: object. | |
67be2dd1 | 247 | * @fmt: format string used to build the name |
1da177e4 LT |
248 | * |
249 | * If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated | |
250 | * string that @kobj->k_name points to. Otherwise, use the static | |
251 | * @kobj->name array. | |
252 | */ | |
1da177e4 LT |
253 | int kobject_set_name(struct kobject * kobj, const char * fmt, ...) |
254 | { | |
255 | int error = 0; | |
256 | int limit = KOBJ_NAME_LEN; | |
257 | int need; | |
258 | va_list args; | |
259 | char * name; | |
260 | ||
261 | /* | |
262 | * First, try the static array | |
263 | */ | |
264 | va_start(args,fmt); | |
265 | need = vsnprintf(kobj->name,limit,fmt,args); | |
266 | va_end(args); | |
267 | if (need < limit) | |
268 | name = kobj->name; | |
269 | else { | |
270 | /* | |
271 | * Need more space? Allocate it and try again | |
272 | */ | |
273 | limit = need + 1; | |
274 | name = kmalloc(limit,GFP_KERNEL); | |
275 | if (!name) { | |
276 | error = -ENOMEM; | |
277 | goto Done; | |
278 | } | |
279 | va_start(args,fmt); | |
280 | need = vsnprintf(name,limit,fmt,args); | |
281 | va_end(args); | |
282 | ||
283 | /* Still? Give up. */ | |
284 | if (need >= limit) { | |
285 | kfree(name); | |
286 | error = -EFAULT; | |
287 | goto Done; | |
288 | } | |
289 | } | |
290 | ||
291 | /* Free the old name, if necessary. */ | |
292 | if (kobj->k_name && kobj->k_name != kobj->name) | |
293 | kfree(kobj->k_name); | |
294 | ||
295 | /* Now, set the new name */ | |
296 | kobj->k_name = name; | |
297 | Done: | |
298 | return error; | |
299 | } | |
300 | ||
301 | EXPORT_SYMBOL(kobject_set_name); | |
302 | ||
303 | ||
304 | /** | |
305 | * kobject_rename - change the name of an object | |
306 | * @kobj: object in question. | |
307 | * @new_name: object's new name | |
308 | */ | |
309 | ||
f3b4f3c6 | 310 | int kobject_rename(struct kobject * kobj, const char *new_name) |
1da177e4 LT |
311 | { |
312 | int error = 0; | |
313 | ||
314 | kobj = kobject_get(kobj); | |
315 | if (!kobj) | |
316 | return -EINVAL; | |
b592fcfe EB |
317 | if (!kobj->parent) |
318 | return -EINVAL; | |
319 | error = sysfs_rename_dir(kobj, kobj->parent->dentry, new_name); | |
320 | kobject_put(kobj); | |
321 | ||
322 | return error; | |
323 | } | |
324 | ||
325 | /** | |
326 | * kobject_rename - change the name of an object | |
327 | * @kobj: object in question. | |
328 | * @new_name: object's new name | |
329 | */ | |
330 | ||
331 | int kobject_shadow_rename(struct kobject * kobj, struct dentry *new_parent, | |
332 | const char *new_name) | |
333 | { | |
334 | int error = 0; | |
335 | ||
336 | kobj = kobject_get(kobj); | |
337 | if (!kobj) | |
338 | return -EINVAL; | |
339 | error = sysfs_rename_dir(kobj, new_parent, new_name); | |
1da177e4 LT |
340 | kobject_put(kobj); |
341 | ||
342 | return error; | |
343 | } | |
344 | ||
8a82472f CH |
345 | /** |
346 | * kobject_move - move object to another parent | |
347 | * @kobj: object in question. | |
c744aeae | 348 | * @new_parent: object's new parent (can be NULL) |
8a82472f CH |
349 | */ |
350 | ||
351 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) | |
352 | { | |
353 | int error; | |
354 | struct kobject *old_parent; | |
355 | const char *devpath = NULL; | |
356 | char *devpath_string = NULL; | |
357 | char *envp[2]; | |
358 | ||
359 | kobj = kobject_get(kobj); | |
360 | if (!kobj) | |
361 | return -EINVAL; | |
362 | new_parent = kobject_get(new_parent); | |
363 | if (!new_parent) { | |
c744aeae CH |
364 | if (kobj->kset) |
365 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f CH |
366 | } |
367 | /* old object path */ | |
368 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
369 | if (!devpath) { | |
370 | error = -ENOMEM; | |
371 | goto out; | |
372 | } | |
373 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
374 | if (!devpath_string) { | |
375 | error = -ENOMEM; | |
376 | goto out; | |
377 | } | |
378 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
379 | envp[0] = devpath_string; | |
380 | envp[1] = NULL; | |
381 | error = sysfs_move_dir(kobj, new_parent); | |
382 | if (error) | |
383 | goto out; | |
384 | old_parent = kobj->parent; | |
385 | kobj->parent = new_parent; | |
386 | kobject_put(old_parent); | |
387 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
388 | out: | |
389 | kobject_put(kobj); | |
390 | kfree(devpath_string); | |
391 | kfree(devpath); | |
392 | return error; | |
393 | } | |
394 | ||
1da177e4 LT |
395 | /** |
396 | * kobject_del - unlink kobject from hierarchy. | |
397 | * @kobj: object. | |
398 | */ | |
399 | ||
400 | void kobject_del(struct kobject * kobj) | |
401 | { | |
31b9025a GKH |
402 | if (!kobj) |
403 | return; | |
1da177e4 LT |
404 | sysfs_remove_dir(kobj); |
405 | unlink(kobj); | |
406 | } | |
407 | ||
408 | /** | |
409 | * kobject_unregister - remove object from hierarchy and decrement refcount. | |
410 | * @kobj: object going away. | |
411 | */ | |
412 | ||
413 | void kobject_unregister(struct kobject * kobj) | |
414 | { | |
31b9025a GKH |
415 | if (!kobj) |
416 | return; | |
1da177e4 | 417 | pr_debug("kobject %s: unregistering\n",kobject_name(kobj)); |
312c004d | 418 | kobject_uevent(kobj, KOBJ_REMOVE); |
1da177e4 LT |
419 | kobject_del(kobj); |
420 | kobject_put(kobj); | |
421 | } | |
422 | ||
423 | /** | |
424 | * kobject_get - increment refcount for object. | |
425 | * @kobj: object. | |
426 | */ | |
427 | ||
428 | struct kobject * kobject_get(struct kobject * kobj) | |
429 | { | |
430 | if (kobj) | |
431 | kref_get(&kobj->kref); | |
432 | return kobj; | |
433 | } | |
434 | ||
435 | /** | |
436 | * kobject_cleanup - free kobject resources. | |
437 | * @kobj: object. | |
438 | */ | |
439 | ||
440 | void kobject_cleanup(struct kobject * kobj) | |
441 | { | |
442 | struct kobj_type * t = get_ktype(kobj); | |
443 | struct kset * s = kobj->kset; | |
444 | struct kobject * parent = kobj->parent; | |
445 | ||
446 | pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); | |
447 | if (kobj->k_name != kobj->name) | |
448 | kfree(kobj->k_name); | |
449 | kobj->k_name = NULL; | |
450 | if (t && t->release) | |
451 | t->release(kobj); | |
452 | if (s) | |
453 | kset_put(s); | |
b067db49 | 454 | kobject_put(parent); |
1da177e4 LT |
455 | } |
456 | ||
457 | static void kobject_release(struct kref *kref) | |
458 | { | |
459 | kobject_cleanup(container_of(kref, struct kobject, kref)); | |
460 | } | |
461 | ||
462 | /** | |
463 | * kobject_put - decrement refcount for object. | |
464 | * @kobj: object. | |
465 | * | |
466 | * Decrement the refcount, and if 0, call kobject_cleanup(). | |
467 | */ | |
468 | void kobject_put(struct kobject * kobj) | |
469 | { | |
470 | if (kobj) | |
471 | kref_put(&kobj->kref, kobject_release); | |
472 | } | |
473 | ||
474 | ||
7423172a JN |
475 | static void dir_release(struct kobject *kobj) |
476 | { | |
477 | kfree(kobj); | |
478 | } | |
479 | ||
480 | static struct kobj_type dir_ktype = { | |
481 | .release = dir_release, | |
482 | .sysfs_ops = NULL, | |
483 | .default_attrs = NULL, | |
484 | }; | |
485 | ||
486 | /** | |
487 | * kobject_add_dir - add sub directory of object. | |
488 | * @parent: object in which a directory is created. | |
489 | * @name: directory name. | |
490 | * | |
491 | * Add a plain directory object as child of given object. | |
492 | */ | |
493 | struct kobject *kobject_add_dir(struct kobject *parent, const char *name) | |
494 | { | |
495 | struct kobject *k; | |
10188012 | 496 | int ret; |
7423172a JN |
497 | |
498 | if (!parent) | |
499 | return NULL; | |
500 | ||
501 | k = kzalloc(sizeof(*k), GFP_KERNEL); | |
502 | if (!k) | |
503 | return NULL; | |
504 | ||
505 | k->parent = parent; | |
506 | k->ktype = &dir_ktype; | |
507 | kobject_set_name(k, name); | |
10188012 RD |
508 | ret = kobject_register(k); |
509 | if (ret < 0) { | |
510 | printk(KERN_WARNING "kobject_add_dir: " | |
511 | "kobject_register error: %d\n", ret); | |
512 | kobject_del(k); | |
513 | return NULL; | |
514 | } | |
7423172a JN |
515 | |
516 | return k; | |
517 | } | |
7423172a | 518 | |
1da177e4 LT |
519 | /** |
520 | * kset_init - initialize a kset for use | |
521 | * @k: kset | |
522 | */ | |
523 | ||
524 | void kset_init(struct kset * k) | |
525 | { | |
526 | kobject_init(&k->kobj); | |
527 | INIT_LIST_HEAD(&k->list); | |
528 | spin_lock_init(&k->list_lock); | |
529 | } | |
530 | ||
531 | ||
532 | /** | |
533 | * kset_add - add a kset object to the hierarchy. | |
534 | * @k: kset. | |
535 | * | |
536 | * Simply, this adds the kset's embedded kobject to the | |
537 | * hierarchy. | |
538 | * We also try to make sure that the kset's embedded kobject | |
539 | * has a parent before it is added. We only care if the embedded | |
540 | * kobject is not part of a kset itself, since kobject_add() | |
541 | * assigns a parent in that case. | |
542 | * If that is the case, and the kset has a controlling subsystem, | |
543 | * then we set the kset's parent to be said subsystem. | |
544 | */ | |
545 | ||
546 | int kset_add(struct kset * k) | |
547 | { | |
548 | if (!k->kobj.parent && !k->kobj.kset && k->subsys) | |
549 | k->kobj.parent = &k->subsys->kset.kobj; | |
550 | ||
551 | return kobject_add(&k->kobj); | |
552 | } | |
553 | ||
554 | ||
555 | /** | |
556 | * kset_register - initialize and add a kset. | |
557 | * @k: kset. | |
558 | */ | |
559 | ||
560 | int kset_register(struct kset * k) | |
561 | { | |
31b9025a GKH |
562 | if (!k) |
563 | return -EINVAL; | |
1da177e4 LT |
564 | kset_init(k); |
565 | return kset_add(k); | |
566 | } | |
567 | ||
568 | ||
569 | /** | |
570 | * kset_unregister - remove a kset. | |
571 | * @k: kset. | |
572 | */ | |
573 | ||
574 | void kset_unregister(struct kset * k) | |
575 | { | |
31b9025a GKH |
576 | if (!k) |
577 | return; | |
1da177e4 LT |
578 | kobject_unregister(&k->kobj); |
579 | } | |
580 | ||
581 | ||
582 | /** | |
583 | * kset_find_obj - search for object in kset. | |
584 | * @kset: kset we're looking in. | |
585 | * @name: object's name. | |
586 | * | |
587 | * Lock kset via @kset->subsys, and iterate over @kset->list, | |
588 | * looking for a matching kobject. If matching object is found | |
589 | * take a reference and return the object. | |
590 | */ | |
591 | ||
592 | struct kobject * kset_find_obj(struct kset * kset, const char * name) | |
593 | { | |
594 | struct list_head * entry; | |
595 | struct kobject * ret = NULL; | |
596 | ||
597 | spin_lock(&kset->list_lock); | |
598 | list_for_each(entry,&kset->list) { | |
599 | struct kobject * k = to_kobj(entry); | |
600 | if (kobject_name(k) && !strcmp(kobject_name(k),name)) { | |
601 | ret = kobject_get(k); | |
602 | break; | |
603 | } | |
604 | } | |
605 | spin_unlock(&kset->list_lock); | |
606 | return ret; | |
607 | } | |
608 | ||
609 | ||
610 | void subsystem_init(struct subsystem * s) | |
611 | { | |
612 | init_rwsem(&s->rwsem); | |
613 | kset_init(&s->kset); | |
614 | } | |
615 | ||
616 | /** | |
617 | * subsystem_register - register a subsystem. | |
618 | * @s: the subsystem we're registering. | |
619 | * | |
620 | * Once we register the subsystem, we want to make sure that | |
621 | * the kset points back to this subsystem for correct usage of | |
622 | * the rwsem. | |
623 | */ | |
624 | ||
625 | int subsystem_register(struct subsystem * s) | |
626 | { | |
627 | int error; | |
628 | ||
31b9025a GKH |
629 | if (!s) |
630 | return -EINVAL; | |
631 | ||
1da177e4 LT |
632 | subsystem_init(s); |
633 | pr_debug("subsystem %s: registering\n",s->kset.kobj.name); | |
634 | ||
635 | if (!(error = kset_add(&s->kset))) { | |
636 | if (!s->kset.subsys) | |
637 | s->kset.subsys = s; | |
638 | } | |
639 | return error; | |
640 | } | |
641 | ||
642 | void subsystem_unregister(struct subsystem * s) | |
643 | { | |
31b9025a GKH |
644 | if (!s) |
645 | return; | |
1da177e4 LT |
646 | pr_debug("subsystem %s: unregistering\n",s->kset.kobj.name); |
647 | kset_unregister(&s->kset); | |
648 | } | |
649 | ||
650 | ||
651 | /** | |
652 | * subsystem_create_file - export sysfs attribute file. | |
653 | * @s: subsystem. | |
654 | * @a: subsystem attribute descriptor. | |
655 | */ | |
656 | ||
657 | int subsys_create_file(struct subsystem * s, struct subsys_attribute * a) | |
658 | { | |
659 | int error = 0; | |
31b9025a GKH |
660 | |
661 | if (!s || !a) | |
662 | return -EINVAL; | |
663 | ||
1da177e4 LT |
664 | if (subsys_get(s)) { |
665 | error = sysfs_create_file(&s->kset.kobj,&a->attr); | |
666 | subsys_put(s); | |
667 | } | |
668 | return error; | |
669 | } | |
670 | ||
671 | ||
672 | /** | |
673 | * subsystem_remove_file - remove sysfs attribute file. | |
674 | * @s: subsystem. | |
675 | * @a: attribute desciptor. | |
676 | */ | |
5b3ef14e | 677 | #if 0 |
1da177e4 LT |
678 | void subsys_remove_file(struct subsystem * s, struct subsys_attribute * a) |
679 | { | |
680 | if (subsys_get(s)) { | |
681 | sysfs_remove_file(&s->kset.kobj,&a->attr); | |
682 | subsys_put(s); | |
683 | } | |
684 | } | |
5b3ef14e | 685 | #endif /* 0 */ |
1da177e4 LT |
686 | |
687 | EXPORT_SYMBOL(kobject_init); | |
688 | EXPORT_SYMBOL(kobject_register); | |
689 | EXPORT_SYMBOL(kobject_unregister); | |
690 | EXPORT_SYMBOL(kobject_get); | |
691 | EXPORT_SYMBOL(kobject_put); | |
692 | EXPORT_SYMBOL(kobject_add); | |
693 | EXPORT_SYMBOL(kobject_del); | |
694 | ||
695 | EXPORT_SYMBOL(kset_register); | |
696 | EXPORT_SYMBOL(kset_unregister); | |
1da177e4 | 697 | |
1da177e4 LT |
698 | EXPORT_SYMBOL(subsystem_register); |
699 | EXPORT_SYMBOL(subsystem_unregister); | |
700 | EXPORT_SYMBOL(subsys_create_file); |