2 * sysfs.h - definitions for the device driver filesystem
4 * Copyright (c) 2001,2002 Patrick Mochel
5 * Copyright (c) 2004 Silicon Graphics, Inc.
6 * Copyright (c) 2007 SUSE Linux Products GmbH
7 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
9 * Please see Documentation/filesystems/sysfs.txt for more information.
15 #include <linux/compiler.h>
16 #include <linux/errno.h>
17 #include <linux/list.h>
18 #include <linux/lockdep.h>
19 #include <linux/kobject_ns.h>
20 #include <linux/atomic.h>
29 #ifdef CONFIG_DEBUG_LOCK_ALLOC
30 bool ignore_lockdep:1;
31 struct lock_class_key *key;
32 struct lock_class_key skey;
37 * sysfs_attr_init - initialize a dynamically allocated sysfs attribute
38 * @attr: struct attribute to initialize
40 * Initialize a dynamically allocated struct attribute so we can
41 * make lockdep happy. This is a new requirement for attributes
42 * and initially this is only needed when lockdep is enabled.
43 * Lockdep gives a nice error when your attribute is added to
44 * sysfs if you don't have this.
46 #ifdef CONFIG_DEBUG_LOCK_ALLOC
47 #define sysfs_attr_init(attr) \
49 static struct lock_class_key __key; \
51 (attr)->key = &__key; \
54 #define sysfs_attr_init(attr) do {} while(0)
57 struct attribute_group {
59 umode_t (*is_visible)(struct kobject *,
60 struct attribute *, int);
61 struct attribute **attrs;
67 * Use these macros to make defining attributes easier. See include/linux/device.h
71 #define __ATTR(_name,_mode,_show,_store) { \
72 .attr = {.name = __stringify(_name), .mode = _mode }, \
77 #define __ATTR_RO(_name) { \
78 .attr = { .name = __stringify(_name), .mode = 0444 }, \
79 .show = _name##_show, \
82 #define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store)
84 #define __ATTR_NULL { .attr = { .name = NULL } }
86 #ifdef CONFIG_DEBUG_LOCK_ALLOC
87 #define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \
88 .attr = {.name = __stringify(_name), .mode = _mode, \
89 .ignore_lockdep = true }, \
94 #define __ATTR_IGNORE_LOCKDEP __ATTR
97 #define ATTRIBUTE_GROUPS(name) \
98 static const struct attribute_group name##_group = { \
99 .attrs = name##_attrs, \
101 static const struct attribute_group *name##_groups[] = { \
106 #define attr_name(_attr) (_attr).attr.name
109 struct vm_area_struct;
111 struct bin_attribute {
112 struct attribute attr;
115 ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
116 char *, loff_t, size_t);
117 ssize_t (*write)(struct file *,struct kobject *, struct bin_attribute *,
118 char *, loff_t, size_t);
119 int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
120 struct vm_area_struct *vma);
124 * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
125 * @attr: struct bin_attribute to initialize
127 * Initialize a dynamically allocated struct bin_attribute so we
128 * can make lockdep happy. This is a new requirement for
129 * attributes and initially this is only needed when lockdep is
130 * enabled. Lockdep gives a nice error when your attribute is
131 * added to sysfs if you don't have this.
133 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
135 /* macro to create static binary attributes easier */
136 #define BIN_ATTR(_name, _mode, _read, _write, _size) \
137 struct bin_attribute bin_attr_##_name = { \
138 .attr = {.name = __stringify(_name), .mode = _mode }, \
145 ssize_t (*show)(struct kobject *, struct attribute *,char *);
146 ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
147 const void *(*namespace)(struct kobject *, const struct attribute *);
154 int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
155 void *data, struct module *owner);
157 int __must_check sysfs_create_dir(struct kobject *kobj);
158 void sysfs_remove_dir(struct kobject *kobj);
159 int __must_check sysfs_rename_dir(struct kobject *kobj, const char *new_name);
160 int __must_check sysfs_move_dir(struct kobject *kobj,
161 struct kobject *new_parent_kobj);
163 int __must_check sysfs_create_file(struct kobject *kobj,
164 const struct attribute *attr);
165 int __must_check sysfs_create_files(struct kobject *kobj,
166 const struct attribute **attr);
167 int __must_check sysfs_chmod_file(struct kobject *kobj,
168 const struct attribute *attr, umode_t mode);
169 void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
170 void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
172 int __must_check sysfs_create_bin_file(struct kobject *kobj,
173 const struct bin_attribute *attr);
174 void sysfs_remove_bin_file(struct kobject *kobj,
175 const struct bin_attribute *attr);
177 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
179 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
180 struct kobject *target,
182 void sysfs_remove_link(struct kobject *kobj, const char *name);
184 int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
185 const char *old_name, const char *new_name);
187 void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
190 int __must_check sysfs_create_group(struct kobject *kobj,
191 const struct attribute_group *grp);
192 int sysfs_update_group(struct kobject *kobj,
193 const struct attribute_group *grp);
194 void sysfs_remove_group(struct kobject *kobj,
195 const struct attribute_group *grp);
196 int sysfs_add_file_to_group(struct kobject *kobj,
197 const struct attribute *attr, const char *group);
198 void sysfs_remove_file_from_group(struct kobject *kobj,
199 const struct attribute *attr, const char *group);
200 int sysfs_merge_group(struct kobject *kobj,
201 const struct attribute_group *grp);
202 void sysfs_unmerge_group(struct kobject *kobj,
203 const struct attribute_group *grp);
204 int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
205 struct kobject *target, const char *link_name);
206 void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
207 const char *link_name);
209 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
210 void sysfs_notify_dirent(struct sysfs_dirent *sd);
211 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
213 const unsigned char *name);
214 struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
215 void sysfs_put(struct sysfs_dirent *sd);
217 int __must_check sysfs_init(void);
219 #else /* CONFIG_SYSFS */
221 static inline int sysfs_schedule_callback(struct kobject *kobj,
222 void (*func)(void *), void *data, struct module *owner)
227 static inline int sysfs_create_dir(struct kobject *kobj)
232 static inline void sysfs_remove_dir(struct kobject *kobj)
236 static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
241 static inline int sysfs_move_dir(struct kobject *kobj,
242 struct kobject *new_parent_kobj)
247 static inline int sysfs_create_file(struct kobject *kobj,
248 const struct attribute *attr)
253 static inline int sysfs_create_files(struct kobject *kobj,
254 const struct attribute **attr)
259 static inline int sysfs_chmod_file(struct kobject *kobj,
260 const struct attribute *attr, umode_t mode)
265 static inline void sysfs_remove_file(struct kobject *kobj,
266 const struct attribute *attr)
270 static inline void sysfs_remove_files(struct kobject *kobj,
271 const struct attribute **attr)
275 static inline int sysfs_create_bin_file(struct kobject *kobj,
276 const struct bin_attribute *attr)
281 static inline void sysfs_remove_bin_file(struct kobject *kobj,
282 const struct bin_attribute *attr)
286 static inline int sysfs_create_link(struct kobject *kobj,
287 struct kobject *target, const char *name)
292 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
293 struct kobject *target,
299 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
303 static inline int sysfs_rename_link(struct kobject *k, struct kobject *t,
304 const char *old_name, const char *new_name)
309 static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
314 static inline int sysfs_create_group(struct kobject *kobj,
315 const struct attribute_group *grp)
320 static inline int sysfs_update_group(struct kobject *kobj,
321 const struct attribute_group *grp)
326 static inline void sysfs_remove_group(struct kobject *kobj,
327 const struct attribute_group *grp)
331 static inline int sysfs_add_file_to_group(struct kobject *kobj,
332 const struct attribute *attr, const char *group)
337 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
338 const struct attribute *attr, const char *group)
342 static inline int sysfs_merge_group(struct kobject *kobj,
343 const struct attribute_group *grp)
348 static inline void sysfs_unmerge_group(struct kobject *kobj,
349 const struct attribute_group *grp)
353 static inline int sysfs_add_link_to_group(struct kobject *kobj,
354 const char *group_name, struct kobject *target,
355 const char *link_name)
360 static inline void sysfs_remove_link_from_group(struct kobject *kobj,
361 const char *group_name, const char *link_name)
365 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
369 static inline void sysfs_notify_dirent(struct sysfs_dirent *sd)
373 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
375 const unsigned char *name)
379 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
383 static inline void sysfs_put(struct sysfs_dirent *sd)
387 static inline int __must_check sysfs_init(void)
392 #endif /* CONFIG_SYSFS */
394 #endif /* _SYSFS_H_ */