blob: 03d40360ff1be9682f4c192fec63e45b0d9e33fd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * kobject.c - library routines for handling generic kernel objects
3 *
4 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
Greg Kroah-Hartmanf0e7e1b2007-09-27 14:48:53 -07005 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (c) 2006-2007 Novell Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This file is released under the GPLv2.
9 *
10 *
11 * Please see the file Documentation/kobject.txt for critical information
12 * about using the kobject interface.
13 */
14
15#include <linux/kobject.h>
16#include <linux/string.h>
17#include <linux/module.h>
18#include <linux/stat.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080019#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21/**
22 * populate_dir - populate directory with attributes.
23 * @kobj: object we're working on.
24 *
25 * Most subsystems have a set of default attributes that
26 * are associated with an object that registers with them.
27 * This is a helper called during object registration that
28 * loops through the default attributes of the subsystem
29 * and creates attributes files for them in sysfs.
30 *
31 */
32
33static int populate_dir(struct kobject * kobj)
34{
35 struct kobj_type * t = get_ktype(kobj);
36 struct attribute * attr;
37 int error = 0;
38 int i;
39
40 if (t && t->default_attrs) {
41 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
42 if ((error = sysfs_create_file(kobj,attr)))
43 break;
44 }
45 }
46 return error;
47}
48
Eric W. Biederman90bc6132007-07-31 19:15:08 +090049static int create_dir(struct kobject * kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 int error = 0;
52 if (kobject_name(kobj)) {
Eric W. Biederman90bc6132007-07-31 19:15:08 +090053 error = sysfs_create_dir(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 if (!error) {
55 if ((error = populate_dir(kobj)))
56 sysfs_remove_dir(kobj);
57 }
58 }
59 return error;
60}
61
62static inline struct kobject * to_kobj(struct list_head * entry)
63{
64 return container_of(entry,struct kobject,entry);
65}
66
67static int get_kobj_path_length(struct kobject *kobj)
68{
69 int length = 1;
70 struct kobject * parent = kobj;
71
72 /* walk up the ancestors until we hit the one pointing to the
73 * root.
74 * Add 1 to strlen for leading '/' of each level.
75 */
76 do {
Chuck Ebbertb365b3d2006-01-12 20:02:00 -050077 if (kobject_name(parent) == NULL)
78 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 length += strlen(kobject_name(parent)) + 1;
80 parent = parent->parent;
81 } while (parent);
82 return length;
83}
84
85static void fill_kobj_path(struct kobject *kobj, char *path, int length)
86{
87 struct kobject * parent;
88
89 --length;
90 for (parent = kobj; parent; parent = parent->parent) {
91 int cur = strlen(kobject_name(parent));
92 /* back up enough to print this name with '/' */
93 length -= cur;
94 strncpy (path + length, kobject_name(parent), cur);
95 *(path + --length) = '/';
96 }
97
98 pr_debug("%s: path = '%s'\n",__FUNCTION__,path);
99}
100
101/**
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800102 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 *
104 * @kobj: kobject in question, with which to build the path
105 * @gfp_mask: the allocation type used to allocate the path
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800106 *
107 * The result must be freed by the caller with kfree().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
Al Virofd4f2df2005-10-21 03:18:50 -0400109char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 char *path;
112 int len;
113
114 len = get_kobj_path_length(kobj);
Chuck Ebbertb365b3d2006-01-12 20:02:00 -0500115 if (len == 0)
116 return NULL;
Burman Yan4668edc2006-12-06 20:38:51 -0800117 path = kzalloc(len, gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (!path)
119 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 fill_kobj_path(kobj, path, len);
121
122 return path;
123}
Dmitry Torokhov80fc9f52006-10-11 01:43:58 -0400124EXPORT_SYMBOL_GPL(kobject_get_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126/**
127 * kobject_init - initialize object.
128 * @kobj: object in question.
129 */
130void kobject_init(struct kobject * kobj)
131{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800132 if (!kobj)
133 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 kref_init(&kobj->kref);
135 INIT_LIST_HEAD(&kobj->entry);
136 kobj->kset = kset_get(kobj->kset);
137}
138
139
140/**
141 * unlink - remove kobject from kset list.
142 * @kobj: kobject.
143 *
144 * Remove the kobject from the kset list and decrement
145 * its parent's refcount.
146 * This is separated out, so we can use it in both
147 * kobject_del() and kobject_add() on error.
148 */
149
150static void unlink(struct kobject * kobj)
151{
152 if (kobj->kset) {
153 spin_lock(&kobj->kset->list_lock);
154 list_del_init(&kobj->entry);
155 spin_unlock(&kobj->kset->list_lock);
156 }
157 kobject_put(kobj);
158}
159
160/**
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900161 * kobject_add - add an object to the hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 * @kobj: object.
163 */
164
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900165int kobject_add(struct kobject * kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 int error = 0;
168 struct kobject * parent;
169
170 if (!(kobj = kobject_get(kobj)))
171 return -ENOENT;
172 if (!kobj->k_name)
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700173 kobject_set_name(kobj, "NO_NAME");
Martin Stoilov13507702007-02-05 16:15:23 -0800174 if (!*kobj->k_name) {
Greg Kroah-Hartmanc171fef2006-01-20 14:08:59 -0800175 pr_debug("kobject attempted to be registered with no name!\n");
176 WARN_ON(1);
Cornelia Huck88db4722007-04-10 14:35:27 +0200177 kobject_put(kobj);
Greg Kroah-Hartmanc171fef2006-01-20 14:08:59 -0800178 return -EINVAL;
179 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 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>",
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700184 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
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);
Dmitriy Monakhov460f7e92007-03-10 14:00:10 +0300194 kobj->parent = parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900197 error = create_dir(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 if (error) {
199 /* unlink does the kobject_put() for us */
200 unlink(kobj);
Mariusz Kozlowskib067db42007-01-02 13:44:44 +0100201 kobject_put(parent);
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800202
203 /* be noisy on error issues */
204 if (error == -EEXIST)
Greg Kroah-Hartman5c73a3f2007-06-07 15:05:15 -0700205 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",
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800208 kobject_name(kobj));
209 else
Greg Kroah-Hartman5c73a3f2007-06-07 15:05:15 -0700210 printk(KERN_ERR "kobject_add failed for %s (%d)\n",
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800211 kobject_name(kobj), error);
Greg Kroah-Hartman5c73a3f2007-06-07 15:05:15 -0700212 dump_stack();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214
215 return error;
216}
217
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700218/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * kobject_register - initialize and add an object.
220 * @kobj: object in question.
221 */
222
223int kobject_register(struct kobject * kobj)
224{
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800225 int error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (kobj) {
227 kobject_init(kobj);
228 error = kobject_add(kobj);
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800229 if (!error)
Kay Sievers312c0042005-11-16 09:00:00 +0100230 kobject_uevent(kobj, KOBJ_ADD);
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return error;
233}
234
235
236/**
237 * kobject_set_name - Set the name of an object
238 * @kobj: object.
Martin Waitz67be2dd2005-05-01 08:59:26 -0700239 * @fmt: format string used to build the name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 *
241 * If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated
242 * string that @kobj->k_name points to. Otherwise, use the static
243 * @kobj->name array.
244 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245int kobject_set_name(struct kobject * kobj, const char * fmt, ...)
246{
247 int error = 0;
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700248 int limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 int need;
250 va_list args;
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700251 char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700253 /* find out how big a buffer we need */
254 name = kmalloc(1024, GFP_KERNEL);
255 if (!name) {
256 error = -ENOMEM;
257 goto done;
258 }
259 va_start(args, fmt);
260 need = vsnprintf(name, 1024, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 va_end(args);
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700262 kfree(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700264 /* Allocate the new space and copy the string in */
265 limit = need + 1;
266 name = kmalloc(limit, GFP_KERNEL);
267 if (!name) {
268 error = -ENOMEM;
269 goto done;
270 }
271 va_start(args, fmt);
272 need = vsnprintf(name, limit, fmt, args);
273 va_end(args);
274
275 /* something wrong with the string we copied? */
276 if (need >= limit) {
277 kfree(name);
278 error = -EFAULT;
279 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 }
281
282 /* Free the old name, if necessary. */
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700283 kfree(kobj->k_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 /* Now, set the new name */
286 kobj->k_name = name;
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700287done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return error;
289}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290EXPORT_SYMBOL(kobject_set_name);
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292/**
293 * kobject_rename - change the name of an object
294 * @kobj: object in question.
295 * @new_name: object's new name
296 */
297
Dmitry Torokhovf3b4f3c2005-04-26 02:32:00 -0500298int kobject_rename(struct kobject * kobj, const char *new_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 int error = 0;
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800301 const char *devpath = NULL;
302 char *devpath_string = NULL;
303 char *envp[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 kobj = kobject_get(kobj);
306 if (!kobj)
307 return -EINVAL;
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700308 if (!kobj->parent)
309 return -EINVAL;
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800310
311 devpath = kobject_get_path(kobj, GFP_KERNEL);
312 if (!devpath) {
313 error = -ENOMEM;
314 goto out;
315 }
316 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
317 if (!devpath_string) {
318 error = -ENOMEM;
319 goto out;
320 }
321 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
322 envp[0] = devpath_string;
323 envp[1] = NULL;
324 /* Note : if we want to send the new name alone, not the full path,
325 * we could probably use kobject_name(kobj); */
326
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900327 error = sysfs_rename_dir(kobj, new_name);
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800328
329 /* This function is mostly/only used for network interface.
330 * Some hotplug package track interfaces by their name and
331 * therefore want to know when the name is changed by the user. */
332 if (!error)
333 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
334
335out:
336 kfree(devpath_string);
337 kfree(devpath);
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700338 kobject_put(kobj);
339
340 return error;
341}
342
343/**
Cornelia Huck8a824722006-11-20 17:07:51 +0100344 * kobject_move - move object to another parent
345 * @kobj: object in question.
Cornelia Huckc744aea2007-01-08 20:16:44 +0100346 * @new_parent: object's new parent (can be NULL)
Cornelia Huck8a824722006-11-20 17:07:51 +0100347 */
348
349int kobject_move(struct kobject *kobj, struct kobject *new_parent)
350{
351 int error;
352 struct kobject *old_parent;
353 const char *devpath = NULL;
354 char *devpath_string = NULL;
355 char *envp[2];
356
357 kobj = kobject_get(kobj);
358 if (!kobj)
359 return -EINVAL;
360 new_parent = kobject_get(new_parent);
361 if (!new_parent) {
Cornelia Huckc744aea2007-01-08 20:16:44 +0100362 if (kobj->kset)
363 new_parent = kobject_get(&kobj->kset->kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +0100364 }
365 /* old object path */
366 devpath = kobject_get_path(kobj, GFP_KERNEL);
367 if (!devpath) {
368 error = -ENOMEM;
369 goto out;
370 }
371 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
372 if (!devpath_string) {
373 error = -ENOMEM;
374 goto out;
375 }
376 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
377 envp[0] = devpath_string;
378 envp[1] = NULL;
379 error = sysfs_move_dir(kobj, new_parent);
380 if (error)
381 goto out;
382 old_parent = kobj->parent;
383 kobj->parent = new_parent;
Dmitriy Monakhov9e993ef2007-03-03 16:11:21 +0300384 new_parent = NULL;
Cornelia Huck8a824722006-11-20 17:07:51 +0100385 kobject_put(old_parent);
386 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
387out:
Dmitriy Monakhov9e993ef2007-03-03 16:11:21 +0300388 kobject_put(new_parent);
Cornelia Huck8a824722006-11-20 17:07:51 +0100389 kobject_put(kobj);
390 kfree(devpath_string);
391 kfree(devpath);
392 return error;
393}
394
395/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 * kobject_del - unlink kobject from hierarchy.
397 * @kobj: object.
398 */
399
400void kobject_del(struct kobject * kobj)
401{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800402 if (!kobj)
403 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 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
413void kobject_unregister(struct kobject * kobj)
414{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800415 if (!kobj)
416 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 pr_debug("kobject %s: unregistering\n",kobject_name(kobj));
Kay Sievers312c0042005-11-16 09:00:00 +0100418 kobject_uevent(kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 kobject_del(kobj);
420 kobject_put(kobj);
421}
422
423/**
424 * kobject_get - increment refcount for object.
425 * @kobj: object.
426 */
427
428struct 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
440void 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;
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700445 const char *name = kobj->k_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700448 if (t && t->release) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 t->release(kobj);
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700450 /* If we have a release function, we can guess that this was
451 * not a statically allocated kobject, so we should be safe to
452 * free the name */
453 kfree(name);
454 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 if (s)
456 kset_put(s);
Mariusz Kozlowskib067db42007-01-02 13:44:44 +0100457 kobject_put(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460static void kobject_release(struct kref *kref)
461{
462 kobject_cleanup(container_of(kref, struct kobject, kref));
463}
464
465/**
466 * kobject_put - decrement refcount for object.
467 * @kobj: object.
468 *
469 * Decrement the refcount, and if 0, call kobject_cleanup().
470 */
471void kobject_put(struct kobject * kobj)
472{
473 if (kobj)
474 kref_put(&kobj->kref, kobject_release);
475}
476
477
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500478static void dir_release(struct kobject *kobj)
479{
480 kfree(kobj);
481}
482
483static struct kobj_type dir_ktype = {
484 .release = dir_release,
485 .sysfs_ops = NULL,
486 .default_attrs = NULL,
487};
488
489/**
Eric W. Biederman27531332007-04-06 10:47:11 -0600490 * kobject_kset_add_dir - add sub directory of object.
Kay Sievers86406242007-03-14 03:25:56 +0100491 * @kset: kset the directory is belongs to.
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500492 * @parent: object in which a directory is created.
493 * @name: directory name.
494 *
495 * Add a plain directory object as child of given object.
496 */
Kay Sievers86406242007-03-14 03:25:56 +0100497struct kobject *kobject_kset_add_dir(struct kset *kset,
498 struct kobject *parent, const char *name)
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500499{
500 struct kobject *k;
Randy Dunlap10188012006-07-11 20:49:41 -0700501 int ret;
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500502
503 if (!parent)
504 return NULL;
505
506 k = kzalloc(sizeof(*k), GFP_KERNEL);
507 if (!k)
508 return NULL;
509
Kay Sievers86406242007-03-14 03:25:56 +0100510 k->kset = kset;
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500511 k->parent = parent;
512 k->ktype = &dir_ktype;
513 kobject_set_name(k, name);
Randy Dunlap10188012006-07-11 20:49:41 -0700514 ret = kobject_register(k);
515 if (ret < 0) {
Eric W. Biederman27531332007-04-06 10:47:11 -0600516 printk(KERN_WARNING "%s: kobject_register error: %d\n",
517 __func__, ret);
Randy Dunlap10188012006-07-11 20:49:41 -0700518 kobject_del(k);
519 return NULL;
520 }
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500521
522 return k;
523}
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500524
Eric W. Biederman27531332007-04-06 10:47:11 -0600525/**
526 * kobject_add_dir - add sub directory of object.
527 * @parent: object in which a directory is created.
528 * @name: directory name.
529 *
530 * Add a plain directory object as child of given object.
531 */
Kay Sievers86406242007-03-14 03:25:56 +0100532struct kobject *kobject_add_dir(struct kobject *parent, const char *name)
533{
534 return kobject_kset_add_dir(NULL, parent, name);
535}
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537/**
538 * kset_init - initialize a kset for use
539 * @k: kset
540 */
541
542void kset_init(struct kset * k)
543{
544 kobject_init(&k->kobj);
545 INIT_LIST_HEAD(&k->list);
546 spin_lock_init(&k->list_lock);
547}
548
549
550/**
551 * kset_add - add a kset object to the hierarchy.
552 * @k: kset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 */
554
555int kset_add(struct kset * k)
556{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 return kobject_add(&k->kobj);
558}
559
560
561/**
562 * kset_register - initialize and add a kset.
563 * @k: kset.
564 */
565
566int kset_register(struct kset * k)
567{
Kay Sievers80f03e32007-05-26 11:21:36 +0200568 int err;
569
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800570 if (!k)
571 return -EINVAL;
Kay Sievers80f03e32007-05-26 11:21:36 +0200572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 kset_init(k);
Kay Sievers80f03e32007-05-26 11:21:36 +0200574 err = kset_add(k);
575 if (err)
576 return err;
577 kobject_uevent(&k->kobj, KOBJ_ADD);
578 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
580
581
582/**
583 * kset_unregister - remove a kset.
584 * @k: kset.
585 */
586
587void kset_unregister(struct kset * k)
588{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800589 if (!k)
590 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 kobject_unregister(&k->kobj);
592}
593
594
595/**
596 * kset_find_obj - search for object in kset.
597 * @kset: kset we're looking in.
598 * @name: object's name.
599 *
600 * Lock kset via @kset->subsys, and iterate over @kset->list,
601 * looking for a matching kobject. If matching object is found
602 * take a reference and return the object.
603 */
604
605struct kobject * kset_find_obj(struct kset * kset, const char * name)
606{
607 struct list_head * entry;
608 struct kobject * ret = NULL;
609
610 spin_lock(&kset->list_lock);
611 list_for_each(entry,&kset->list) {
612 struct kobject * k = to_kobj(entry);
613 if (kobject_name(k) && !strcmp(kobject_name(k),name)) {
614 ret = kobject_get(k);
615 break;
616 }
617 }
618 spin_unlock(&kset->list_lock);
619 return ret;
620}
621
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700622int subsystem_register(struct kset *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700624 return kset_register(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700627void subsystem_unregister(struct kset *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700629 kset_unregister(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632/**
633 * subsystem_create_file - export sysfs attribute file.
634 * @s: subsystem.
635 * @a: subsystem attribute descriptor.
636 */
637
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700638int subsys_create_file(struct kset *s, struct subsys_attribute *a)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
640 int error = 0;
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800641
642 if (!s || !a)
643 return -EINVAL;
644
Greg Kroah-Hartman1ef4cfa2007-09-12 15:06:57 -0700645 if (kset_get(s)) {
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700646 error = sysfs_create_file(&s->kobj, &a->attr);
Greg Kroah-Hartman6e9d9302007-09-12 15:06:57 -0700647 kset_put(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 }
649 return error;
650}
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652EXPORT_SYMBOL(kobject_init);
653EXPORT_SYMBOL(kobject_register);
654EXPORT_SYMBOL(kobject_unregister);
655EXPORT_SYMBOL(kobject_get);
656EXPORT_SYMBOL(kobject_put);
657EXPORT_SYMBOL(kobject_add);
658EXPORT_SYMBOL(kobject_del);
659
660EXPORT_SYMBOL(kset_register);
661EXPORT_SYMBOL(kset_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663EXPORT_SYMBOL(subsystem_register);
664EXPORT_SYMBOL(subsystem_unregister);
665EXPORT_SYMBOL(subsys_create_file);