blob: 1d63ead1815e4f5cb8aae5ea2d86a1541eed23a2 [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
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080021/*
22 * populate_dir - populate directory with attributes.
23 * @kobj: object we're working on.
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 *
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080025 * Most subsystems have a set of default attributes that are associated
26 * with an object that registers with them. This is a helper called during
27 * object registration that loops through the default attributes of the
28 * subsystem and creates attributes files for them in sysfs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080030static int populate_dir(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080032 struct kobj_type *t = get_ktype(kobj);
33 struct attribute *attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 int error = 0;
35 int i;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080036
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 if (t && t->default_attrs) {
38 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080039 error = sysfs_create_file(kobj, attr);
40 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 break;
42 }
43 }
44 return error;
45}
46
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080047static int create_dir(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
49 int error = 0;
50 if (kobject_name(kobj)) {
Eric W. Biederman90bc6132007-07-31 19:15:08 +090051 error = sysfs_create_dir(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 if (!error) {
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080053 error = populate_dir(kobj);
54 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 sysfs_remove_dir(kobj);
56 }
57 }
58 return error;
59}
60
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080061static inline struct kobject *to_kobj(struct list_head *entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080063 return container_of(entry, struct kobject, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66static int get_kobj_path_length(struct kobject *kobj)
67{
68 int length = 1;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080069 struct kobject *parent = kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080071 /* walk up the ancestors until we hit the one pointing to the
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 * root.
73 * Add 1 to strlen for leading '/' of each level.
74 */
75 do {
Chuck Ebbertb365b3d2006-01-12 20:02:00 -050076 if (kobject_name(parent) == NULL)
77 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 length += strlen(kobject_name(parent)) + 1;
79 parent = parent->parent;
80 } while (parent);
81 return length;
82}
83
84static void fill_kobj_path(struct kobject *kobj, char *path, int length)
85{
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080086 struct kobject *parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 --length;
89 for (parent = kobj; parent; parent = parent->parent) {
90 int cur = strlen(kobject_name(parent));
91 /* back up enough to print this name with '/' */
92 length -= cur;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080093 strncpy(path + length, kobject_name(parent), cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 *(path + --length) = '/';
95 }
96
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -080097 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -080098 kobj, __FUNCTION__, path);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
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
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100126/* add the kobject to its kset's list */
127static void kobj_kset_join(struct kobject *kobj)
128{
129 if (!kobj->kset)
130 return;
131
132 kset_get(kobj->kset);
133 spin_lock(&kobj->kset->list_lock);
134 list_add_tail(&kobj->entry, &kobj->kset->list);
135 spin_unlock(&kobj->kset->list_lock);
136}
137
138/* remove the kobject from its kset's list */
139static void kobj_kset_leave(struct kobject *kobj)
140{
141 if (!kobj->kset)
142 return;
143
144 spin_lock(&kobj->kset->list_lock);
145 list_del_init(&kobj->entry);
146 spin_unlock(&kobj->kset->list_lock);
147 kset_put(kobj->kset);
148}
149
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800150static void kobject_init_internal(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800152 if (!kobj)
153 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 kref_init(&kobj->kref);
155 INIT_LIST_HEAD(&kobj->entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158
Greg Kroah-Hartman9e7bbcc2007-12-17 23:05:35 -0700159static int kobject_add_internal(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 int error = 0;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800162 struct kobject *parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100164 if (!kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return -ENOENT;
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100166
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100167 if (!kobj->name || !kobj->name[0]) {
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100168 pr_debug("kobject: (%p): attempted to be registered with empty "
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800169 "name!\n", kobj);
Greg Kroah-Hartmanc171fef2006-01-20 14:08:59 -0800170 WARN_ON(1);
171 return -EINVAL;
172 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 parent = kobject_get(kobj->parent);
175
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100176 /* join kset if set, use it as parent if we do not already have one */
177 if (kobj->kset) {
178 if (!parent)
179 parent = kobject_get(&kobj->kset->kobj);
180 kobj_kset_join(kobj);
181 kobj->parent = parent;
182 }
183
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800184 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
185 kobject_name(kobj), kobj, __FUNCTION__,
186 parent ? kobject_name(parent) : "<NULL>",
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800187 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900189 error = create_dir(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (error) {
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100191 kobj_kset_leave(kobj);
192 kobject_put(parent);
193 kobj->parent = NULL;
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800194
195 /* be noisy on error issues */
196 if (error == -EEXIST)
Greg Kroah-Hartman9e7bbcc2007-12-17 23:05:35 -0700197 printk(KERN_ERR "%s failed for %s with "
Greg Kroah-Hartman5c73a3f2007-06-07 15:05:15 -0700198 "-EEXIST, don't try to register things with "
199 "the same name in the same directory.\n",
Greg Kroah-Hartman9e7bbcc2007-12-17 23:05:35 -0700200 __FUNCTION__, kobject_name(kobj));
Greg Kroah-Hartmandcd0da02006-03-20 13:17:13 -0800201 else
Greg Kroah-Hartman9e7bbcc2007-12-17 23:05:35 -0700202 printk(KERN_ERR "%s failed for %s (%d)\n",
203 __FUNCTION__, kobject_name(kobj), error);
Greg Kroah-Hartman5c73a3f2007-06-07 15:05:15 -0700204 dump_stack();
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100205 } else
206 kobj->state_in_sysfs = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 return error;
209}
210
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700211/**
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500212 * kobject_set_name_vargs - Set the name of an kobject
213 * @kobj: struct kobject to set the name of
Greg Kroah-Hartman8c4606b2007-12-04 14:45:47 +0800214 * @fmt: format string used to build the name
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500215 * @vargs: vargs to format the string.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 */
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500217static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
218 va_list vargs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500220 va_list aq;
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700221 char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500223 va_copy(aq, vargs);
224 name = kvasprintf(GFP_KERNEL, fmt, vargs);
225 va_end(aq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500227 if (!name)
228 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 /* Free the old name, if necessary. */
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100231 kfree(kobj->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 /* Now, set the new name */
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100234 kobj->name = name;
Greg Kroah-Hartman663a4742007-11-29 18:32:47 -0500235
236 return 0;
237}
238
239/**
240 * kobject_set_name - Set the name of a kobject
241 * @kobj: struct kobject to set the name of
242 * @fmt: format string used to build the name
243 *
244 * This sets the name of the kobject. If you have already added the
245 * kobject to the system, you must call kobject_rename() in order to
246 * change the name of the kobject.
247 */
248int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
249{
250 va_list args;
251 int retval;
252
253 va_start(args, fmt);
254 retval = kobject_set_name_vargs(kobj, fmt, args);
255 va_end(args);
256
257 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259EXPORT_SYMBOL(kobject_set_name);
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261/**
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700262 * kobject_init - initialize a kobject structure
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800263 * @kobj: pointer to the kobject to initialize
264 * @ktype: pointer to the ktype for this kobject.
265 *
266 * This function will properly initialize a kobject such that it can then
267 * be passed to the kobject_add() call.
268 *
269 * After this function is called, the kobject MUST be cleaned up by a call
270 * to kobject_put(), not by a call to kfree directly to ensure that all of
271 * the memory is cleaned up properly.
272 */
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700273void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800274{
275 char *err_str;
276
277 if (!kobj) {
278 err_str = "invalid kobject pointer!";
279 goto error;
280 }
281 if (!ktype) {
282 err_str = "must have a ktype to be initialized properly!\n";
283 goto error;
284 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100285 if (kobj->state_initialized) {
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800286 /* do not error out as sometimes we can recover */
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100287 printk(KERN_ERR "kobject (%p): tried to init an initialized "
288 "object, something is seriously wrong.\n", kobj);
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800289 dump_stack();
290 }
291
292 kref_init(&kobj->kref);
293 INIT_LIST_HEAD(&kobj->entry);
294 kobj->ktype = ktype;
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100295 kobj->state_in_sysfs = 0;
296 kobj->state_add_uevent_sent = 0;
297 kobj->state_remove_uevent_sent = 0;
298 kobj->state_initialized = 1;
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800299 return;
300
301error:
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100302 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800303 dump_stack();
304}
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700305EXPORT_SYMBOL(kobject_init);
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800306
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800307static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
308 const char *fmt, va_list vargs)
309{
310 va_list aq;
311 int retval;
312
313 va_copy(aq, vargs);
314 retval = kobject_set_name_vargs(kobj, fmt, aq);
315 va_end(aq);
316 if (retval) {
317 printk(KERN_ERR "kobject: can not set name properly!\n");
318 return retval;
319 }
320 kobj->parent = parent;
Greg Kroah-Hartman9e7bbcc2007-12-17 23:05:35 -0700321 return kobject_add_internal(kobj);
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800322}
323
324/**
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700325 * kobject_add - the main kobject add function
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800326 * @kobj: the kobject to add
327 * @parent: pointer to the parent of the kobject.
328 * @fmt: format to name the kobject with.
329 *
330 * The kobject name is set and added to the kobject hierarchy in this
331 * function.
332 *
333 * If @parent is set, then the parent of the @kobj will be set to it.
334 * If @parent is NULL, then the parent of the @kobj will be set to the
335 * kobject associted with the kset assigned to this kobject. If no kset
336 * is assigned to the kobject, then the kobject will be located in the
337 * root of the sysfs tree.
338 *
339 * If this function returns an error, kobject_put() must be called to
340 * properly clean up the memory associated with the object.
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800341 * Under no instance should the kobject that is passed to this function
342 * be directly freed with a call to kfree(), that can leak memory.
343 *
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100344 * Note, no "add" uevent will be created with this call, the caller should set
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800345 * up all of the necessary sysfs files for the object and then call
346 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
347 * userspace is properly notified of this kobject's creation.
348 */
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700349int kobject_add(struct kobject *kobj, struct kobject *parent,
350 const char *fmt, ...)
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800351{
352 va_list args;
353 int retval;
354
355 if (!kobj)
356 return -EINVAL;
357
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100358 if (!kobj->state_initialized) {
359 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
360 "uninitialized object, something is seriously wrong.\n",
361 kobject_name(kobj), kobj);
362 dump_stack();
363 return -EINVAL;
364 }
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800365 va_start(args, fmt);
366 retval = kobject_add_varg(kobj, parent, fmt, args);
367 va_end(args);
368
369 return retval;
370}
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700371EXPORT_SYMBOL(kobject_add);
Greg Kroah-Hartman244f6ce2007-12-03 21:31:08 -0800372
Greg Kroah-Hartmane86000d2007-12-03 21:31:08 -0800373/**
Greg Kroah-Hartmanc11c4152007-12-03 21:31:08 -0800374 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
375 * @kobj: pointer to the kobject to initialize
376 * @ktype: pointer to the ktype for this kobject.
377 * @parent: pointer to the parent of this kobject.
378 * @fmt: the name of the kobject.
379 *
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700380 * This function combines the call to kobject_init() and
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700381 * kobject_add(). The same type of error handling after a call to
382 * kobject_add() and kobject lifetime rules are the same here.
Greg Kroah-Hartmanc11c4152007-12-03 21:31:08 -0800383 */
384int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
385 struct kobject *parent, const char *fmt, ...)
386{
387 va_list args;
388 int retval;
389
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700390 kobject_init(kobj, ktype);
Greg Kroah-Hartmanc11c4152007-12-03 21:31:08 -0800391
392 va_start(args, fmt);
393 retval = kobject_add_varg(kobj, parent, fmt, args);
394 va_end(args);
395
396 return retval;
397}
398EXPORT_SYMBOL_GPL(kobject_init_and_add);
399
400/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800401 * kobject_rename - change the name of an object
402 * @kobj: object in question.
403 * @new_name: object's new name
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800405int kobject_rename(struct kobject *kobj, const char *new_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
407 int error = 0;
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800408 const char *devpath = NULL;
409 char *devpath_string = NULL;
410 char *envp[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 kobj = kobject_get(kobj);
413 if (!kobj)
414 return -EINVAL;
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700415 if (!kobj->parent)
416 return -EINVAL;
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800417
Greg Kroah-Hartman34358c22007-10-24 16:52:31 -0700418 /* see if this name is already in use */
419 if (kobj->kset) {
420 struct kobject *temp_kobj;
421 temp_kobj = kset_find_obj(kobj->kset, new_name);
422 if (temp_kobj) {
Johannes Berg71409a42007-11-05 13:59:11 +0100423 printk(KERN_WARNING "kobject '%s' cannot be renamed "
424 "to '%s' as '%s' is already in existence.\n",
Greg Kroah-Hartman34358c22007-10-24 16:52:31 -0700425 kobject_name(kobj), new_name, new_name);
426 kobject_put(temp_kobj);
427 return -EINVAL;
428 }
429 }
430
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800431 devpath = kobject_get_path(kobj, GFP_KERNEL);
432 if (!devpath) {
433 error = -ENOMEM;
434 goto out;
435 }
436 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
437 if (!devpath_string) {
438 error = -ENOMEM;
439 goto out;
440 }
441 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
442 envp[0] = devpath_string;
443 envp[1] = NULL;
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800444
Eric W. Biederman90bc6132007-07-31 19:15:08 +0900445 error = sysfs_rename_dir(kobj, new_name);
Jean Tourrilhesca2f37d2007-03-07 10:49:30 -0800446
447 /* This function is mostly/only used for network interface.
448 * Some hotplug package track interfaces by their name and
449 * therefore want to know when the name is changed by the user. */
450 if (!error)
451 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
452
453out:
454 kfree(devpath_string);
455 kfree(devpath);
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700456 kobject_put(kobj);
457
458 return error;
459}
460
461/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800462 * kobject_move - move object to another parent
463 * @kobj: object in question.
464 * @new_parent: object's new parent (can be NULL)
Cornelia Huck8a824722006-11-20 17:07:51 +0100465 */
Cornelia Huck8a824722006-11-20 17:07:51 +0100466int kobject_move(struct kobject *kobj, struct kobject *new_parent)
467{
468 int error;
469 struct kobject *old_parent;
470 const char *devpath = NULL;
471 char *devpath_string = NULL;
472 char *envp[2];
473
474 kobj = kobject_get(kobj);
475 if (!kobj)
476 return -EINVAL;
477 new_parent = kobject_get(new_parent);
478 if (!new_parent) {
Cornelia Huckc744aea2007-01-08 20:16:44 +0100479 if (kobj->kset)
480 new_parent = kobject_get(&kobj->kset->kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +0100481 }
482 /* old object path */
483 devpath = kobject_get_path(kobj, GFP_KERNEL);
484 if (!devpath) {
485 error = -ENOMEM;
486 goto out;
487 }
488 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
489 if (!devpath_string) {
490 error = -ENOMEM;
491 goto out;
492 }
493 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
494 envp[0] = devpath_string;
495 envp[1] = NULL;
496 error = sysfs_move_dir(kobj, new_parent);
497 if (error)
498 goto out;
499 old_parent = kobj->parent;
500 kobj->parent = new_parent;
Dmitriy Monakhov9e993ef2007-03-03 16:11:21 +0300501 new_parent = NULL;
Cornelia Huck8a824722006-11-20 17:07:51 +0100502 kobject_put(old_parent);
503 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
504out:
Dmitriy Monakhov9e993ef2007-03-03 16:11:21 +0300505 kobject_put(new_parent);
Cornelia Huck8a824722006-11-20 17:07:51 +0100506 kobject_put(kobj);
507 kfree(devpath_string);
508 kfree(devpath);
509 return error;
510}
511
512/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800513 * kobject_del - unlink kobject from hierarchy.
514 * @kobj: object.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800516void kobject_del(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800518 if (!kobj)
519 return;
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 sysfs_remove_dir(kobj);
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100522 kobj->state_in_sysfs = 0;
523 kobj_kset_leave(kobj);
524 kobject_put(kobj->parent);
525 kobj->parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
528/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800529 * kobject_get - increment refcount for object.
530 * @kobj: object.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800532struct kobject *kobject_get(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533{
534 if (kobj)
535 kref_get(&kobj->kref);
536 return kobj;
537}
538
Greg Kroah-Hartman18041f42007-12-03 21:31:08 -0800539/*
540 * kobject_cleanup - free kobject resources.
541 * @kobj: object to cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 */
Greg Kroah-Hartman18041f42007-12-03 21:31:08 -0800543static void kobject_cleanup(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100545 struct kobj_type *t = get_ktype(kobj);
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100546 const char *name = kobj->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800548 pr_debug("kobject: '%s' (%p): %s\n",
549 kobject_name(kobj), kobj, __FUNCTION__);
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100550
551 if (t && !t->release)
552 pr_debug("kobject: '%s' (%p): does not have a release() "
553 "function, it is broken and must be fixed.\n",
554 kobject_name(kobj), kobj);
555
556 /* send "remove" if the caller did not do it but sent "add" */
557 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
558 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
559 kobject_name(kobj), kobj);
560 kobject_uevent(kobj, KOBJ_REMOVE);
561 }
562
563 /* remove from sysfs if the caller did not do it */
564 if (kobj->state_in_sysfs) {
565 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
566 kobject_name(kobj), kobj);
567 kobject_del(kobj);
568 }
569
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700570 if (t && t->release) {
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100571 pr_debug("kobject: '%s' (%p): calling ktype release\n",
572 kobject_name(kobj), kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 t->release(kobj);
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100574 }
575
576 /* free name if we allocated it */
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100577 if (name) {
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100578 pr_debug("kobject: '%s': free name\n", name);
Greg Kroah-Hartmance2c9cb2007-09-12 15:06:57 -0700579 kfree(name);
580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
582
583static void kobject_release(struct kref *kref)
584{
585 kobject_cleanup(container_of(kref, struct kobject, kref));
586}
587
588/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800589 * kobject_put - decrement refcount for object.
590 * @kobj: object.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 *
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800592 * Decrement the refcount, and if 0, call kobject_cleanup().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800594void kobject_put(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
596 if (kobj)
597 kref_put(&kobj->kref, kobject_release);
598}
599
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800600static void dynamic_kobj_release(struct kobject *kobj)
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500601{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100602 pr_debug("kobject: (%p): %s\n", kobj, __FUNCTION__);
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500603 kfree(kobj);
604}
605
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800606static struct kobj_type dynamic_kobj_ktype = {
Kay Sievers386f2752007-11-02 13:47:53 +0100607 .release = dynamic_kobj_release,
608 .sysfs_ops = &kobj_sysfs_ops,
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500609};
610
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800611/**
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800612 * kobject_create - create a struct kobject dynamically
613 *
614 * This function creates a kobject structure dynamically and sets it up
615 * to be a "dynamic" kobject with a default release function set up.
616 *
617 * If the kobject was not able to be created, NULL will be returned.
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800618 * The kobject structure returned from here must be cleaned up with a
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700619 * call to kobject_put() and not kfree(), as kobject_init() has
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800620 * already been called on this structure.
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800621 */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800622struct kobject *kobject_create(void)
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800623{
624 struct kobject *kobj;
625
626 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
627 if (!kobj)
628 return NULL;
629
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700630 kobject_init(kobj, &dynamic_kobj_ktype);
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800631 return kobj;
632}
633
634/**
635 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
636 *
637 * @name: the name for the kset
638 * @parent: the parent kobject of this kobject, if any.
639 *
640 * This function creates a kset structure dynamically and registers it
641 * with sysfs. When you are finished with this structure, call
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -0800642 * kobject_put() and the structure will be dynamically freed when
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800643 * it is no longer being used.
644 *
645 * If the kobject was not able to be created, NULL will be returned.
646 */
647struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
648{
649 struct kobject *kobj;
650 int retval;
651
652 kobj = kobject_create();
653 if (!kobj)
654 return NULL;
655
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700656 retval = kobject_add(kobj, parent, "%s", name);
Greg Kroah-Hartman3f9e3ee2007-11-05 13:16:15 -0800657 if (retval) {
658 printk(KERN_WARNING "%s: kobject_add error: %d\n",
659 __FUNCTION__, retval);
660 kobject_put(kobj);
661 kobj = NULL;
662 }
663 return kobj;
664}
665EXPORT_SYMBOL_GPL(kobject_create_and_add);
666
Jun'ichi Nomura74231722006-03-13 17:14:25 -0500667/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800668 * kset_init - initialize a kset for use
669 * @k: kset
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800671void kset_init(struct kset *k)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
Greg Kroah-Hartmane1543dd2007-12-17 23:05:35 -0700673 kobject_init_internal(&k->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 INIT_LIST_HEAD(&k->list);
675 spin_lock_init(&k->list_lock);
676}
677
Kay Sievers23b52122007-11-02 13:47:53 +0100678/* default kobject attribute operations */
679static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
680 char *buf)
681{
682 struct kobj_attribute *kattr;
683 ssize_t ret = -EIO;
684
685 kattr = container_of(attr, struct kobj_attribute, attr);
686 if (kattr->show)
687 ret = kattr->show(kobj, kattr, buf);
688 return ret;
689}
690
691static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
692 const char *buf, size_t count)
693{
694 struct kobj_attribute *kattr;
695 ssize_t ret = -EIO;
696
697 kattr = container_of(attr, struct kobj_attribute, attr);
698 if (kattr->store)
699 ret = kattr->store(kobj, kattr, buf, count);
700 return ret;
701}
702
703struct sysfs_ops kobj_sysfs_ops = {
704 .show = kobj_attr_show,
705 .store = kobj_attr_store,
706};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
708/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800709 * kset_register - initialize and add a kset.
710 * @k: kset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800712int kset_register(struct kset *k)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713{
Kay Sievers80f03e32007-05-26 11:21:36 +0200714 int err;
715
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800716 if (!k)
717 return -EINVAL;
Kay Sievers80f03e32007-05-26 11:21:36 +0200718
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 kset_init(k);
Greg Kroah-Hartman12e339a2002-04-09 12:14:34 -0700720 err = kobject_add_internal(&k->kobj);
Kay Sievers80f03e32007-05-26 11:21:36 +0200721 if (err)
722 return err;
723 kobject_uevent(&k->kobj, KOBJ_ADD);
724 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800728 * kset_unregister - remove a kset.
729 * @k: kset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800731void kset_unregister(struct kset *k)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
Greg Kroah-Hartman31b90252007-01-18 12:23:51 -0800733 if (!k)
734 return;
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -0800735 kobject_put(&k->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736}
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738/**
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800739 * kset_find_obj - search for object in kset.
740 * @kset: kset we're looking in.
741 * @name: object's name.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 *
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800743 * Lock kset via @kset->subsys, and iterate over @kset->list,
744 * looking for a matching kobject. If matching object is found
745 * take a reference and return the object.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 */
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800747struct kobject *kset_find_obj(struct kset *kset, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800749 struct list_head *entry;
750 struct kobject *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
752 spin_lock(&kset->list_lock);
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800753 list_for_each(entry, &kset->list) {
754 struct kobject *k = to_kobj(entry);
755 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 ret = kobject_get(k);
757 break;
758 }
759 }
760 spin_unlock(&kset->list_lock);
761 return ret;
762}
763
Greg Kroah-Hartmanb727c702007-09-27 14:48:53 -0700764static void kset_release(struct kobject *kobj)
765{
766 struct kset *kset = container_of(kobj, struct kset, kobj);
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800767 pr_debug("kobject: '%s' (%p): %s\n",
768 kobject_name(kobj), kobj, __FUNCTION__);
Greg Kroah-Hartmanb727c702007-09-27 14:48:53 -0700769 kfree(kset);
770}
771
Kay Sievers386f2752007-11-02 13:47:53 +0100772static struct kobj_type kset_ktype = {
773 .sysfs_ops = &kobj_sysfs_ops,
Greg Kroah-Hartmanb727c702007-09-27 14:48:53 -0700774 .release = kset_release,
775};
776
777/**
778 * kset_create - create a struct kset dynamically
779 *
780 * @name: the name for the kset
781 * @uevent_ops: a struct kset_uevent_ops for the kset
782 * @parent_kobj: the parent kobject of this kset, if any.
783 *
784 * This function creates a kset structure dynamically. This structure can
785 * then be registered with the system and show up in sysfs with a call to
786 * kset_register(). When you are finished with this structure, if
787 * kset_register() has been called, call kset_unregister() and the
788 * structure will be dynamically freed when it is no longer being used.
789 *
790 * If the kset was not able to be created, NULL will be returned.
791 */
792static struct kset *kset_create(const char *name,
793 struct kset_uevent_ops *uevent_ops,
794 struct kobject *parent_kobj)
795{
796 struct kset *kset;
797
798 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
799 if (!kset)
800 return NULL;
801 kobject_set_name(&kset->kobj, name);
802 kset->uevent_ops = uevent_ops;
803 kset->kobj.parent = parent_kobj;
804
805 /*
Kay Sievers386f2752007-11-02 13:47:53 +0100806 * The kobject of this kset will have a type of kset_ktype and belong to
Greg Kroah-Hartmanb727c702007-09-27 14:48:53 -0700807 * no kset itself. That way we can properly free it when it is
808 * finished being used.
809 */
Kay Sievers386f2752007-11-02 13:47:53 +0100810 kset->kobj.ktype = &kset_ktype;
Greg Kroah-Hartmanb727c702007-09-27 14:48:53 -0700811 kset->kobj.kset = NULL;
812
813 return kset;
814}
815
816/**
817 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
818 *
819 * @name: the name for the kset
820 * @uevent_ops: a struct kset_uevent_ops for the kset
821 * @parent_kobj: the parent kobject of this kset, if any.
822 *
823 * This function creates a kset structure dynamically and registers it
824 * with sysfs. When you are finished with this structure, call
825 * kset_unregister() and the structure will be dynamically freed when it
826 * is no longer being used.
827 *
828 * If the kset was not able to be created, NULL will be returned.
829 */
830struct kset *kset_create_and_add(const char *name,
831 struct kset_uevent_ops *uevent_ops,
832 struct kobject *parent_kobj)
833{
834 struct kset *kset;
835 int error;
836
837 kset = kset_create(name, uevent_ops, parent_kobj);
838 if (!kset)
839 return NULL;
840 error = kset_register(kset);
841 if (error) {
842 kfree(kset);
843 return NULL;
844 }
845 return kset;
846}
847EXPORT_SYMBOL_GPL(kset_create_and_add);
848
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849EXPORT_SYMBOL(kobject_get);
850EXPORT_SYMBOL(kobject_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851EXPORT_SYMBOL(kobject_del);
852
853EXPORT_SYMBOL(kset_register);
854EXPORT_SYMBOL(kset_unregister);