Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * kobject.c - library routines for handling generic kernel objects |
| 3 | * |
| 4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> |
Greg Kroah-Hartman | f0e7e1b | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 5 | * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> |
| 6 | * Copyright (c) 2006-2007 Novell Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 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 Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 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 | |
| 33 | static 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. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 49 | static int create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
| 51 | int error = 0; |
| 52 | if (kobject_name(kobj)) { |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 53 | error = sysfs_create_dir(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | if (!error) { |
| 55 | if ((error = populate_dir(kobj))) |
| 56 | sysfs_remove_dir(kobj); |
| 57 | } |
| 58 | } |
| 59 | return error; |
| 60 | } |
| 61 | |
| 62 | static inline struct kobject * to_kobj(struct list_head * entry) |
| 63 | { |
| 64 | return container_of(entry,struct kobject,entry); |
| 65 | } |
| 66 | |
| 67 | static 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 Ebbert | b365b3d | 2006-01-12 20:02:00 -0500 | [diff] [blame] | 77 | if (kobject_name(parent) == NULL) |
| 78 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | length += strlen(kobject_name(parent)) + 1; |
| 80 | parent = parent->parent; |
| 81 | } while (parent); |
| 82 | return length; |
| 83 | } |
| 84 | |
| 85 | static 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 | |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 98 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
| 99 | kobj, __FUNCTION__,path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | /** |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 103 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | * |
| 105 | * @kobj: kobject in question, with which to build the path |
| 106 | * @gfp_mask: the allocation type used to allocate the path |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 107 | * |
| 108 | * The result must be freed by the caller with kfree(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | */ |
Al Viro | fd4f2df | 2005-10-21 03:18:50 -0400 | [diff] [blame] | 110 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
| 112 | char *path; |
| 113 | int len; |
| 114 | |
| 115 | len = get_kobj_path_length(kobj); |
Chuck Ebbert | b365b3d | 2006-01-12 20:02:00 -0500 | [diff] [blame] | 116 | if (len == 0) |
| 117 | return NULL; |
Burman Yan | 4668edc | 2006-12-06 20:38:51 -0800 | [diff] [blame] | 118 | path = kzalloc(len, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | if (!path) |
| 120 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | fill_kobj_path(kobj, path, len); |
| 122 | |
| 123 | return path; |
| 124 | } |
Dmitry Torokhov | 80fc9f5 | 2006-10-11 01:43:58 -0400 | [diff] [blame] | 125 | EXPORT_SYMBOL_GPL(kobject_get_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 127 | /* add the kobject to its kset's list */ |
| 128 | static void kobj_kset_join(struct kobject *kobj) |
| 129 | { |
| 130 | if (!kobj->kset) |
| 131 | return; |
| 132 | |
| 133 | kset_get(kobj->kset); |
| 134 | spin_lock(&kobj->kset->list_lock); |
| 135 | list_add_tail(&kobj->entry, &kobj->kset->list); |
| 136 | spin_unlock(&kobj->kset->list_lock); |
| 137 | } |
| 138 | |
| 139 | /* remove the kobject from its kset's list */ |
| 140 | static void kobj_kset_leave(struct kobject *kobj) |
| 141 | { |
| 142 | if (!kobj->kset) |
| 143 | return; |
| 144 | |
| 145 | spin_lock(&kobj->kset->list_lock); |
| 146 | list_del_init(&kobj->entry); |
| 147 | spin_unlock(&kobj->kset->list_lock); |
| 148 | kset_put(kobj->kset); |
| 149 | } |
| 150 | |
Greg Kroah-Hartman | e1543dd | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 151 | static void kobject_init_internal(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
Greg Kroah-Hartman | 31b9025 | 2007-01-18 12:23:51 -0800 | [diff] [blame] | 153 | if (!kobj) |
| 154 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | kref_init(&kobj->kref); |
| 156 | INIT_LIST_HEAD(&kobj->entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | |
Greg Kroah-Hartman | 9e7bbcc | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 160 | static int kobject_add_internal(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
| 162 | int error = 0; |
| 163 | struct kobject * parent; |
| 164 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 165 | if (!kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return -ENOENT; |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 167 | |
| 168 | if (!kobj->k_name || !kobj->k_name[0]) { |
| 169 | pr_debug("kobject: (%p): attempted to be registered with empty " |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 170 | "name!\n", kobj); |
Greg Kroah-Hartman | c171fef | 2006-01-20 14:08:59 -0800 | [diff] [blame] | 171 | WARN_ON(1); |
| 172 | return -EINVAL; |
| 173 | } |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | parent = kobject_get(kobj->parent); |
| 176 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 177 | /* join kset if set, use it as parent if we do not already have one */ |
| 178 | if (kobj->kset) { |
| 179 | if (!parent) |
| 180 | parent = kobject_get(&kobj->kset->kobj); |
| 181 | kobj_kset_join(kobj); |
| 182 | kobj->parent = parent; |
| 183 | } |
| 184 | |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 185 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
| 186 | kobject_name(kobj), kobj, __FUNCTION__, |
| 187 | parent ? kobject_name(parent) : "<NULL>", |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 188 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 190 | error = create_dir(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (error) { |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 192 | kobj_kset_leave(kobj); |
| 193 | kobject_put(parent); |
| 194 | kobj->parent = NULL; |
Greg Kroah-Hartman | dcd0da0 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 195 | |
| 196 | /* be noisy on error issues */ |
| 197 | if (error == -EEXIST) |
Greg Kroah-Hartman | 9e7bbcc | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 198 | printk(KERN_ERR "%s failed for %s with " |
Greg Kroah-Hartman | 5c73a3f | 2007-06-07 15:05:15 -0700 | [diff] [blame] | 199 | "-EEXIST, don't try to register things with " |
| 200 | "the same name in the same directory.\n", |
Greg Kroah-Hartman | 9e7bbcc | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 201 | __FUNCTION__, kobject_name(kobj)); |
Greg Kroah-Hartman | dcd0da0 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 202 | else |
Greg Kroah-Hartman | 9e7bbcc | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 203 | printk(KERN_ERR "%s failed for %s (%d)\n", |
| 204 | __FUNCTION__, kobject_name(kobj), error); |
Greg Kroah-Hartman | 5c73a3f | 2007-06-07 15:05:15 -0700 | [diff] [blame] | 205 | dump_stack(); |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 206 | } else |
| 207 | kobj->state_in_sysfs = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | return error; |
| 210 | } |
| 211 | |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 212 | /** |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 213 | * kobject_set_name_vargs - Set the name of an kobject |
| 214 | * @kobj: struct kobject to set the name of |
Greg Kroah-Hartman | 8c4606b | 2007-12-04 14:45:47 +0800 | [diff] [blame] | 215 | * @fmt: format string used to build the name |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 216 | * @vargs: vargs to format the string. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | */ |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 218 | static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
| 219 | va_list vargs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 221 | va_list aq; |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 222 | char *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 224 | va_copy(aq, vargs); |
| 225 | name = kvasprintf(GFP_KERNEL, fmt, vargs); |
| 226 | va_end(aq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 228 | if (!name) |
| 229 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* Free the old name, if necessary. */ |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 233 | kfree(kobj->k_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | /* Now, set the new name */ |
| 236 | kobj->k_name = name; |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 237 | kobj->state_name_set = 1; |
Greg Kroah-Hartman | 663a474 | 2007-11-29 18:32:47 -0500 | [diff] [blame] | 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * kobject_set_name - Set the name of a kobject |
| 244 | * @kobj: struct kobject to set the name of |
| 245 | * @fmt: format string used to build the name |
| 246 | * |
| 247 | * This sets the name of the kobject. If you have already added the |
| 248 | * kobject to the system, you must call kobject_rename() in order to |
| 249 | * change the name of the kobject. |
| 250 | */ |
| 251 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
| 252 | { |
| 253 | va_list args; |
| 254 | int retval; |
| 255 | |
| 256 | va_start(args, fmt); |
| 257 | retval = kobject_set_name_vargs(kobj, fmt, args); |
| 258 | va_end(args); |
| 259 | |
| 260 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | EXPORT_SYMBOL(kobject_set_name); |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | /** |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 265 | * kobject_init - initialize a kobject structure |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 266 | * @kobj: pointer to the kobject to initialize |
| 267 | * @ktype: pointer to the ktype for this kobject. |
| 268 | * |
| 269 | * This function will properly initialize a kobject such that it can then |
| 270 | * be passed to the kobject_add() call. |
| 271 | * |
| 272 | * After this function is called, the kobject MUST be cleaned up by a call |
| 273 | * to kobject_put(), not by a call to kfree directly to ensure that all of |
| 274 | * the memory is cleaned up properly. |
| 275 | */ |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 276 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 277 | { |
| 278 | char *err_str; |
| 279 | |
| 280 | if (!kobj) { |
| 281 | err_str = "invalid kobject pointer!"; |
| 282 | goto error; |
| 283 | } |
| 284 | if (!ktype) { |
| 285 | err_str = "must have a ktype to be initialized properly!\n"; |
| 286 | goto error; |
| 287 | } |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 288 | if (kobj->state_initialized) { |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 289 | /* do not error out as sometimes we can recover */ |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 290 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
| 291 | "object, something is seriously wrong.\n", kobj); |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 292 | dump_stack(); |
| 293 | } |
| 294 | |
| 295 | kref_init(&kobj->kref); |
| 296 | INIT_LIST_HEAD(&kobj->entry); |
| 297 | kobj->ktype = ktype; |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 298 | kobj->state_name_set = 0; |
| 299 | kobj->state_in_sysfs = 0; |
| 300 | kobj->state_add_uevent_sent = 0; |
| 301 | kobj->state_remove_uevent_sent = 0; |
| 302 | kobj->state_initialized = 1; |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 303 | return; |
| 304 | |
| 305 | error: |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 306 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 307 | dump_stack(); |
| 308 | } |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 309 | EXPORT_SYMBOL(kobject_init); |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 310 | |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 311 | static int kobject_add_varg(struct kobject *kobj, struct kobject *parent, |
| 312 | const char *fmt, va_list vargs) |
| 313 | { |
| 314 | va_list aq; |
| 315 | int retval; |
| 316 | |
| 317 | va_copy(aq, vargs); |
| 318 | retval = kobject_set_name_vargs(kobj, fmt, aq); |
| 319 | va_end(aq); |
| 320 | if (retval) { |
| 321 | printk(KERN_ERR "kobject: can not set name properly!\n"); |
| 322 | return retval; |
| 323 | } |
| 324 | kobj->parent = parent; |
Greg Kroah-Hartman | 9e7bbcc | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 325 | return kobject_add_internal(kobj); |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /** |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 329 | * kobject_add - the main kobject add function |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 330 | * @kobj: the kobject to add |
| 331 | * @parent: pointer to the parent of the kobject. |
| 332 | * @fmt: format to name the kobject with. |
| 333 | * |
| 334 | * The kobject name is set and added to the kobject hierarchy in this |
| 335 | * function. |
| 336 | * |
| 337 | * If @parent is set, then the parent of the @kobj will be set to it. |
| 338 | * If @parent is NULL, then the parent of the @kobj will be set to the |
| 339 | * kobject associted with the kset assigned to this kobject. If no kset |
| 340 | * is assigned to the kobject, then the kobject will be located in the |
| 341 | * root of the sysfs tree. |
| 342 | * |
| 343 | * If this function returns an error, kobject_put() must be called to |
| 344 | * properly clean up the memory associated with the object. |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 345 | * Under no instance should the kobject that is passed to this function |
| 346 | * be directly freed with a call to kfree(), that can leak memory. |
| 347 | * |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 348 | * Note, no "add" uevent will be created with this call, the caller should set |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 349 | * up all of the necessary sysfs files for the object and then call |
| 350 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that |
| 351 | * userspace is properly notified of this kobject's creation. |
| 352 | */ |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 353 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
| 354 | const char *fmt, ...) |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 355 | { |
| 356 | va_list args; |
| 357 | int retval; |
| 358 | |
| 359 | if (!kobj) |
| 360 | return -EINVAL; |
| 361 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 362 | if (!kobj->state_initialized) { |
| 363 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " |
| 364 | "uninitialized object, something is seriously wrong.\n", |
| 365 | kobject_name(kobj), kobj); |
| 366 | dump_stack(); |
| 367 | return -EINVAL; |
| 368 | } |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 369 | va_start(args, fmt); |
| 370 | retval = kobject_add_varg(kobj, parent, fmt, args); |
| 371 | va_end(args); |
| 372 | |
| 373 | return retval; |
| 374 | } |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 375 | EXPORT_SYMBOL(kobject_add); |
Greg Kroah-Hartman | 244f6ce | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 376 | |
Greg Kroah-Hartman | e86000d | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 377 | /** |
Greg Kroah-Hartman | c11c415 | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 378 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy |
| 379 | * @kobj: pointer to the kobject to initialize |
| 380 | * @ktype: pointer to the ktype for this kobject. |
| 381 | * @parent: pointer to the parent of this kobject. |
| 382 | * @fmt: the name of the kobject. |
| 383 | * |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 384 | * This function combines the call to kobject_init() and |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 385 | * kobject_add(). The same type of error handling after a call to |
| 386 | * kobject_add() and kobject lifetime rules are the same here. |
Greg Kroah-Hartman | c11c415 | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 387 | */ |
| 388 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, |
| 389 | struct kobject *parent, const char *fmt, ...) |
| 390 | { |
| 391 | va_list args; |
| 392 | int retval; |
| 393 | |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 394 | kobject_init(kobj, ktype); |
Greg Kroah-Hartman | c11c415 | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 395 | |
| 396 | va_start(args, fmt); |
| 397 | retval = kobject_add_varg(kobj, parent, fmt, args); |
| 398 | va_end(args); |
| 399 | |
| 400 | return retval; |
| 401 | } |
| 402 | EXPORT_SYMBOL_GPL(kobject_init_and_add); |
| 403 | |
| 404 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | * kobject_rename - change the name of an object |
| 406 | * @kobj: object in question. |
| 407 | * @new_name: object's new name |
| 408 | */ |
| 409 | |
Dmitry Torokhov | f3b4f3c | 2005-04-26 02:32:00 -0500 | [diff] [blame] | 410 | int kobject_rename(struct kobject * kobj, const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | { |
| 412 | int error = 0; |
Jean Tourrilhes | ca2f37d | 2007-03-07 10:49:30 -0800 | [diff] [blame] | 413 | const char *devpath = NULL; |
| 414 | char *devpath_string = NULL; |
| 415 | char *envp[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | kobj = kobject_get(kobj); |
| 418 | if (!kobj) |
| 419 | return -EINVAL; |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 420 | if (!kobj->parent) |
| 421 | return -EINVAL; |
Jean Tourrilhes | ca2f37d | 2007-03-07 10:49:30 -0800 | [diff] [blame] | 422 | |
Greg Kroah-Hartman | 34358c2 | 2007-10-24 16:52:31 -0700 | [diff] [blame] | 423 | /* see if this name is already in use */ |
| 424 | if (kobj->kset) { |
| 425 | struct kobject *temp_kobj; |
| 426 | temp_kobj = kset_find_obj(kobj->kset, new_name); |
| 427 | if (temp_kobj) { |
Johannes Berg | 71409a4 | 2007-11-05 13:59:11 +0100 | [diff] [blame] | 428 | printk(KERN_WARNING "kobject '%s' cannot be renamed " |
| 429 | "to '%s' as '%s' is already in existence.\n", |
Greg Kroah-Hartman | 34358c2 | 2007-10-24 16:52:31 -0700 | [diff] [blame] | 430 | kobject_name(kobj), new_name, new_name); |
| 431 | kobject_put(temp_kobj); |
| 432 | return -EINVAL; |
| 433 | } |
| 434 | } |
| 435 | |
Jean Tourrilhes | ca2f37d | 2007-03-07 10:49:30 -0800 | [diff] [blame] | 436 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
| 437 | if (!devpath) { |
| 438 | error = -ENOMEM; |
| 439 | goto out; |
| 440 | } |
| 441 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); |
| 442 | if (!devpath_string) { |
| 443 | error = -ENOMEM; |
| 444 | goto out; |
| 445 | } |
| 446 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); |
| 447 | envp[0] = devpath_string; |
| 448 | envp[1] = NULL; |
Jean Tourrilhes | ca2f37d | 2007-03-07 10:49:30 -0800 | [diff] [blame] | 449 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 450 | error = sysfs_rename_dir(kobj, new_name); |
Jean Tourrilhes | ca2f37d | 2007-03-07 10:49:30 -0800 | [diff] [blame] | 451 | |
| 452 | /* This function is mostly/only used for network interface. |
| 453 | * Some hotplug package track interfaces by their name and |
| 454 | * therefore want to know when the name is changed by the user. */ |
| 455 | if (!error) |
| 456 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
| 457 | |
| 458 | out: |
| 459 | kfree(devpath_string); |
| 460 | kfree(devpath); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 461 | kobject_put(kobj); |
| 462 | |
| 463 | return error; |
| 464 | } |
| 465 | |
| 466 | /** |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 467 | * kobject_move - move object to another parent |
| 468 | * @kobj: object in question. |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 469 | * @new_parent: object's new parent (can be NULL) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 470 | */ |
| 471 | |
| 472 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
| 473 | { |
| 474 | int error; |
| 475 | struct kobject *old_parent; |
| 476 | const char *devpath = NULL; |
| 477 | char *devpath_string = NULL; |
| 478 | char *envp[2]; |
| 479 | |
| 480 | kobj = kobject_get(kobj); |
| 481 | if (!kobj) |
| 482 | return -EINVAL; |
| 483 | new_parent = kobject_get(new_parent); |
| 484 | if (!new_parent) { |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 485 | if (kobj->kset) |
| 486 | new_parent = kobject_get(&kobj->kset->kobj); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 487 | } |
| 488 | /* old object path */ |
| 489 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
| 490 | if (!devpath) { |
| 491 | error = -ENOMEM; |
| 492 | goto out; |
| 493 | } |
| 494 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); |
| 495 | if (!devpath_string) { |
| 496 | error = -ENOMEM; |
| 497 | goto out; |
| 498 | } |
| 499 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); |
| 500 | envp[0] = devpath_string; |
| 501 | envp[1] = NULL; |
| 502 | error = sysfs_move_dir(kobj, new_parent); |
| 503 | if (error) |
| 504 | goto out; |
| 505 | old_parent = kobj->parent; |
| 506 | kobj->parent = new_parent; |
Dmitriy Monakhov | 9e993ef | 2007-03-03 16:11:21 +0300 | [diff] [blame] | 507 | new_parent = NULL; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 508 | kobject_put(old_parent); |
| 509 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
| 510 | out: |
Dmitriy Monakhov | 9e993ef | 2007-03-03 16:11:21 +0300 | [diff] [blame] | 511 | kobject_put(new_parent); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 512 | kobject_put(kobj); |
| 513 | kfree(devpath_string); |
| 514 | kfree(devpath); |
| 515 | return error; |
| 516 | } |
| 517 | |
| 518 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | * kobject_del - unlink kobject from hierarchy. |
| 520 | * @kobj: object. |
| 521 | */ |
| 522 | |
| 523 | void kobject_del(struct kobject * kobj) |
| 524 | { |
Greg Kroah-Hartman | 31b9025 | 2007-01-18 12:23:51 -0800 | [diff] [blame] | 525 | if (!kobj) |
| 526 | return; |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | sysfs_remove_dir(kobj); |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 529 | kobj->state_in_sysfs = 0; |
| 530 | kobj_kset_leave(kobj); |
| 531 | kobject_put(kobj->parent); |
| 532 | kobj->parent = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | /** |
| 536 | * kobject_unregister - remove object from hierarchy and decrement refcount. |
| 537 | * @kobj: object going away. |
| 538 | */ |
| 539 | |
| 540 | void kobject_unregister(struct kobject * kobj) |
| 541 | { |
Greg Kroah-Hartman | 31b9025 | 2007-01-18 12:23:51 -0800 | [diff] [blame] | 542 | if (!kobj) |
| 543 | return; |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 544 | pr_debug("kobject: '%s' (%p): %s\n", |
| 545 | kobject_name(kobj), kobj, __FUNCTION__); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 546 | kobject_uevent(kobj, KOBJ_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | kobject_del(kobj); |
| 548 | kobject_put(kobj); |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * kobject_get - increment refcount for object. |
| 553 | * @kobj: object. |
| 554 | */ |
| 555 | |
| 556 | struct kobject * kobject_get(struct kobject * kobj) |
| 557 | { |
| 558 | if (kobj) |
| 559 | kref_get(&kobj->kref); |
| 560 | return kobj; |
| 561 | } |
| 562 | |
Greg Kroah-Hartman | 18041f4 | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 563 | /* |
| 564 | * kobject_cleanup - free kobject resources. |
| 565 | * @kobj: object to cleanup |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | */ |
Greg Kroah-Hartman | 18041f4 | 2007-12-03 21:31:08 -0800 | [diff] [blame] | 567 | static void kobject_cleanup(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 569 | struct kobj_type *t = get_ktype(kobj); |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 570 | const char *name = kobj->k_name; |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 571 | int name_set = kobj->state_name_set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 573 | pr_debug("kobject: '%s' (%p): %s\n", |
| 574 | kobject_name(kobj), kobj, __FUNCTION__); |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 575 | |
| 576 | if (t && !t->release) |
| 577 | pr_debug("kobject: '%s' (%p): does not have a release() " |
| 578 | "function, it is broken and must be fixed.\n", |
| 579 | kobject_name(kobj), kobj); |
| 580 | |
| 581 | /* send "remove" if the caller did not do it but sent "add" */ |
| 582 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { |
| 583 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", |
| 584 | kobject_name(kobj), kobj); |
| 585 | kobject_uevent(kobj, KOBJ_REMOVE); |
| 586 | } |
| 587 | |
| 588 | /* remove from sysfs if the caller did not do it */ |
| 589 | if (kobj->state_in_sysfs) { |
| 590 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", |
| 591 | kobject_name(kobj), kobj); |
| 592 | kobject_del(kobj); |
| 593 | } |
| 594 | |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 595 | if (t && t->release) { |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 596 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
| 597 | kobject_name(kobj), kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | t->release(kobj); |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | /* free name if we allocated it */ |
| 602 | if (name_set && name) { |
| 603 | pr_debug("kobject: '%s': free name\n", name); |
Greg Kroah-Hartman | ce2c9cb | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 604 | kfree(name); |
| 605 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
| 608 | static void kobject_release(struct kref *kref) |
| 609 | { |
| 610 | kobject_cleanup(container_of(kref, struct kobject, kref)); |
| 611 | } |
| 612 | |
| 613 | /** |
| 614 | * kobject_put - decrement refcount for object. |
| 615 | * @kobj: object. |
| 616 | * |
| 617 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
| 618 | */ |
| 619 | void kobject_put(struct kobject * kobj) |
| 620 | { |
| 621 | if (kobj) |
| 622 | kref_put(&kobj->kref, kobject_release); |
| 623 | } |
| 624 | |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 625 | static void dynamic_kobj_release(struct kobject *kobj) |
Jun'ichi Nomura | 7423172 | 2006-03-13 17:14:25 -0500 | [diff] [blame] | 626 | { |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 627 | pr_debug("kobject: (%p): %s\n", kobj, __FUNCTION__); |
Jun'ichi Nomura | 7423172 | 2006-03-13 17:14:25 -0500 | [diff] [blame] | 628 | kfree(kobj); |
| 629 | } |
| 630 | |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 631 | static struct kobj_type dynamic_kobj_ktype = { |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 632 | .release = dynamic_kobj_release, |
| 633 | .sysfs_ops = &kobj_sysfs_ops, |
Jun'ichi Nomura | 7423172 | 2006-03-13 17:14:25 -0500 | [diff] [blame] | 634 | }; |
| 635 | |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 636 | /** |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 637 | * kobject_create - create a struct kobject dynamically |
| 638 | * |
| 639 | * This function creates a kobject structure dynamically and sets it up |
| 640 | * to be a "dynamic" kobject with a default release function set up. |
| 641 | * |
| 642 | * If the kobject was not able to be created, NULL will be returned. |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 643 | * The kobject structure returned from here must be cleaned up with a |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 644 | * call to kobject_put() and not kfree(), as kobject_init() has |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 645 | * already been called on this structure. |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 646 | */ |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 647 | struct kobject *kobject_create(void) |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 648 | { |
| 649 | struct kobject *kobj; |
| 650 | |
| 651 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); |
| 652 | if (!kobj) |
| 653 | return NULL; |
| 654 | |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 655 | kobject_init(kobj, &dynamic_kobj_ktype); |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 656 | return kobj; |
| 657 | } |
| 658 | |
| 659 | /** |
| 660 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs |
| 661 | * |
| 662 | * @name: the name for the kset |
| 663 | * @parent: the parent kobject of this kobject, if any. |
| 664 | * |
| 665 | * This function creates a kset structure dynamically and registers it |
| 666 | * with sysfs. When you are finished with this structure, call |
| 667 | * kobject_unregister() and the structure will be dynamically freed when |
| 668 | * it is no longer being used. |
| 669 | * |
| 670 | * If the kobject was not able to be created, NULL will be returned. |
| 671 | */ |
| 672 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) |
| 673 | { |
| 674 | struct kobject *kobj; |
| 675 | int retval; |
| 676 | |
| 677 | kobj = kobject_create(); |
| 678 | if (!kobj) |
| 679 | return NULL; |
| 680 | |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 681 | retval = kobject_add(kobj, parent, "%s", name); |
Greg Kroah-Hartman | 3f9e3ee | 2007-11-05 13:16:15 -0800 | [diff] [blame] | 682 | if (retval) { |
| 683 | printk(KERN_WARNING "%s: kobject_add error: %d\n", |
| 684 | __FUNCTION__, retval); |
| 685 | kobject_put(kobj); |
| 686 | kobj = NULL; |
| 687 | } |
| 688 | return kobj; |
| 689 | } |
| 690 | EXPORT_SYMBOL_GPL(kobject_create_and_add); |
| 691 | |
Jun'ichi Nomura | 7423172 | 2006-03-13 17:14:25 -0500 | [diff] [blame] | 692 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | * kset_init - initialize a kset for use |
| 694 | * @k: kset |
| 695 | */ |
| 696 | |
| 697 | void kset_init(struct kset * k) |
| 698 | { |
Greg Kroah-Hartman | e1543dd | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 699 | kobject_init_internal(&k->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | INIT_LIST_HEAD(&k->list); |
| 701 | spin_lock_init(&k->list_lock); |
| 702 | } |
| 703 | |
Kay Sievers | 23b5212 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 704 | /* default kobject attribute operations */ |
| 705 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, |
| 706 | char *buf) |
| 707 | { |
| 708 | struct kobj_attribute *kattr; |
| 709 | ssize_t ret = -EIO; |
| 710 | |
| 711 | kattr = container_of(attr, struct kobj_attribute, attr); |
| 712 | if (kattr->show) |
| 713 | ret = kattr->show(kobj, kattr, buf); |
| 714 | return ret; |
| 715 | } |
| 716 | |
| 717 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, |
| 718 | const char *buf, size_t count) |
| 719 | { |
| 720 | struct kobj_attribute *kattr; |
| 721 | ssize_t ret = -EIO; |
| 722 | |
| 723 | kattr = container_of(attr, struct kobj_attribute, attr); |
| 724 | if (kattr->store) |
| 725 | ret = kattr->store(kobj, kattr, buf, count); |
| 726 | return ret; |
| 727 | } |
| 728 | |
| 729 | struct sysfs_ops kobj_sysfs_ops = { |
| 730 | .show = kobj_attr_show, |
| 731 | .store = kobj_attr_store, |
| 732 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | * kset_register - initialize and add a kset. |
| 736 | * @k: kset. |
| 737 | */ |
| 738 | |
| 739 | int kset_register(struct kset * k) |
| 740 | { |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 741 | int err; |
| 742 | |
Greg Kroah-Hartman | 31b9025 | 2007-01-18 12:23:51 -0800 | [diff] [blame] | 743 | if (!k) |
| 744 | return -EINVAL; |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | kset_init(k); |
Greg Kroah-Hartman | 12e339a | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 747 | err = kobject_add_internal(&k->kobj); |
Kay Sievers | 80f03e3 | 2007-05-26 11:21:36 +0200 | [diff] [blame] | 748 | if (err) |
| 749 | return err; |
| 750 | kobject_uevent(&k->kobj, KOBJ_ADD); |
| 751 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | |
| 755 | /** |
| 756 | * kset_unregister - remove a kset. |
| 757 | * @k: kset. |
| 758 | */ |
| 759 | |
| 760 | void kset_unregister(struct kset * k) |
| 761 | { |
Greg Kroah-Hartman | 31b9025 | 2007-01-18 12:23:51 -0800 | [diff] [blame] | 762 | if (!k) |
| 763 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | kobject_unregister(&k->kobj); |
| 765 | } |
| 766 | |
| 767 | |
| 768 | /** |
| 769 | * kset_find_obj - search for object in kset. |
| 770 | * @kset: kset we're looking in. |
| 771 | * @name: object's name. |
| 772 | * |
| 773 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
| 774 | * looking for a matching kobject. If matching object is found |
| 775 | * take a reference and return the object. |
| 776 | */ |
| 777 | |
| 778 | struct kobject * kset_find_obj(struct kset * kset, const char * name) |
| 779 | { |
| 780 | struct list_head * entry; |
| 781 | struct kobject * ret = NULL; |
| 782 | |
| 783 | spin_lock(&kset->list_lock); |
| 784 | list_for_each(entry,&kset->list) { |
| 785 | struct kobject * k = to_kobj(entry); |
| 786 | if (kobject_name(k) && !strcmp(kobject_name(k),name)) { |
| 787 | ret = kobject_get(k); |
| 788 | break; |
| 789 | } |
| 790 | } |
| 791 | spin_unlock(&kset->list_lock); |
| 792 | return ret; |
| 793 | } |
| 794 | |
Greg Kroah-Hartman | b727c70 | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 795 | static void kset_release(struct kobject *kobj) |
| 796 | { |
| 797 | struct kset *kset = container_of(kobj, struct kset, kobj); |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 798 | pr_debug("kobject: '%s' (%p): %s\n", |
| 799 | kobject_name(kobj), kobj, __FUNCTION__); |
Greg Kroah-Hartman | b727c70 | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 800 | kfree(kset); |
| 801 | } |
| 802 | |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 803 | static struct kobj_type kset_ktype = { |
| 804 | .sysfs_ops = &kobj_sysfs_ops, |
Greg Kroah-Hartman | b727c70 | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 805 | .release = kset_release, |
| 806 | }; |
| 807 | |
| 808 | /** |
| 809 | * kset_create - create a struct kset dynamically |
| 810 | * |
| 811 | * @name: the name for the kset |
| 812 | * @uevent_ops: a struct kset_uevent_ops for the kset |
| 813 | * @parent_kobj: the parent kobject of this kset, if any. |
| 814 | * |
| 815 | * This function creates a kset structure dynamically. This structure can |
| 816 | * then be registered with the system and show up in sysfs with a call to |
| 817 | * kset_register(). When you are finished with this structure, if |
| 818 | * kset_register() has been called, call kset_unregister() and the |
| 819 | * structure will be dynamically freed when it is no longer being used. |
| 820 | * |
| 821 | * If the kset was not able to be created, NULL will be returned. |
| 822 | */ |
| 823 | static struct kset *kset_create(const char *name, |
| 824 | struct kset_uevent_ops *uevent_ops, |
| 825 | struct kobject *parent_kobj) |
| 826 | { |
| 827 | struct kset *kset; |
| 828 | |
| 829 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); |
| 830 | if (!kset) |
| 831 | return NULL; |
| 832 | kobject_set_name(&kset->kobj, name); |
| 833 | kset->uevent_ops = uevent_ops; |
| 834 | kset->kobj.parent = parent_kobj; |
| 835 | |
| 836 | /* |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 837 | * The kobject of this kset will have a type of kset_ktype and belong to |
Greg Kroah-Hartman | b727c70 | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 838 | * no kset itself. That way we can properly free it when it is |
| 839 | * finished being used. |
| 840 | */ |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 841 | kset->kobj.ktype = &kset_ktype; |
Greg Kroah-Hartman | b727c70 | 2007-09-27 14:48:53 -0700 | [diff] [blame] | 842 | kset->kobj.kset = NULL; |
| 843 | |
| 844 | return kset; |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs |
| 849 | * |
| 850 | * @name: the name for the kset |
| 851 | * @uevent_ops: a struct kset_uevent_ops for the kset |
| 852 | * @parent_kobj: the parent kobject of this kset, if any. |
| 853 | * |
| 854 | * This function creates a kset structure dynamically and registers it |
| 855 | * with sysfs. When you are finished with this structure, call |
| 856 | * kset_unregister() and the structure will be dynamically freed when it |
| 857 | * is no longer being used. |
| 858 | * |
| 859 | * If the kset was not able to be created, NULL will be returned. |
| 860 | */ |
| 861 | struct kset *kset_create_and_add(const char *name, |
| 862 | struct kset_uevent_ops *uevent_ops, |
| 863 | struct kobject *parent_kobj) |
| 864 | { |
| 865 | struct kset *kset; |
| 866 | int error; |
| 867 | |
| 868 | kset = kset_create(name, uevent_ops, parent_kobj); |
| 869 | if (!kset) |
| 870 | return NULL; |
| 871 | error = kset_register(kset); |
| 872 | if (error) { |
| 873 | kfree(kset); |
| 874 | return NULL; |
| 875 | } |
| 876 | return kset; |
| 877 | } |
| 878 | EXPORT_SYMBOL_GPL(kset_create_and_add); |
| 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | EXPORT_SYMBOL(kobject_unregister); |
| 881 | EXPORT_SYMBOL(kobject_get); |
| 882 | EXPORT_SYMBOL(kobject_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | EXPORT_SYMBOL(kobject_del); |
| 884 | |
| 885 | EXPORT_SYMBOL(kset_register); |
| 886 | EXPORT_SYMBOL(kset_unregister); |