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/stat.h>
21 #include <linux/atomic.h>
31 #ifdef CONFIG_DEBUG_LOCK_ALLOC
32 bool ignore_lockdep:1;
33 struct lock_class_key *key;
34 struct lock_class_key skey;
39 * sysfs_attr_init - initialize a dynamically allocated sysfs attribute
40 * @attr: struct attribute to initialize
42 * Initialize a dynamically allocated struct attribute so we can
43 * make lockdep happy. This is a new requirement for attributes
44 * and initially this is only needed when lockdep is enabled.
45 * Lockdep gives a nice error when your attribute is added to
46 * sysfs if you don't have this.
48 #ifdef CONFIG_DEBUG_LOCK_ALLOC
49 #define sysfs_attr_init(attr) \
51 static struct lock_class_key __key; \
53 (attr)->key = &__key; \
56 #define sysfs_attr_init(attr) do {} while (0)
59 struct attribute_group {
61 umode_t (*is_visible)(struct kobject *,
62 struct attribute *, int);
63 struct attribute **attrs;
64 struct bin_attribute **bin_attrs;
68 * Use these macros to make defining attributes easier. See include/linux/device.h
72 #define __ATTR(_name, _mode, _show, _store) { \
73 .attr = {.name = __stringify(_name), .mode = _mode }, \
78 #define __ATTR_RO(_name) { \
79 .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \
80 .show = _name##_show, \
83 #define __ATTR_WO(_name) { \
84 .attr = { .name = __stringify(_name), .mode = S_IWUSR }, \
85 .store = _name##_store, \
88 #define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \
89 _name##_show, _name##_store)
91 #define __ATTR_NULL { .attr = { .name = NULL } }
93 #ifdef CONFIG_DEBUG_LOCK_ALLOC
94 #define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \
95 .attr = {.name = __stringify(_name), .mode = _mode, \
96 .ignore_lockdep = true }, \
101 #define __ATTR_IGNORE_LOCKDEP __ATTR
104 #define __ATTRIBUTE_GROUPS(_name) \
105 static const struct attribute_group *_name##_groups[] = { \
110 #define ATTRIBUTE_GROUPS(_name) \
111 static const struct attribute_group _name##_group = { \
112 .attrs = _name##_attrs, \
114 __ATTRIBUTE_GROUPS(_name)
117 struct vm_area_struct;
119 struct bin_attribute {
120 struct attribute attr;
123 ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
124 char *, loff_t, size_t);
125 ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
126 char *, loff_t, size_t);
127 int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
128 struct vm_area_struct *vma);
132 * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
133 * @attr: struct bin_attribute to initialize
135 * Initialize a dynamically allocated struct bin_attribute so we
136 * can make lockdep happy. This is a new requirement for
137 * attributes and initially this is only needed when lockdep is
138 * enabled. Lockdep gives a nice error when your attribute is
139 * added to sysfs if you don't have this.
141 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
143 /* macros to create static binary attributes easier */
144 #define __BIN_ATTR(_name, _mode, _read, _write, _size) { \
145 .attr = { .name = __stringify(_name), .mode = _mode }, \
151 #define __BIN_ATTR_RO(_name, _size) { \
152 .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \
153 .read = _name##_read, \
157 #define __BIN_ATTR_RW(_name, _size) __BIN_ATTR(_name, \
158 (S_IWUSR | S_IRUGO), _name##_read, \
159 _name##_write, _size)
161 #define __BIN_ATTR_NULL __ATTR_NULL
163 #define BIN_ATTR(_name, _mode, _read, _write, _size) \
164 struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read, \
167 #define BIN_ATTR_RO(_name, _size) \
168 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)
170 #define BIN_ATTR_RW(_name, _size) \
171 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
174 ssize_t (*show)(struct kobject *, struct attribute *, char *);
175 ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
182 int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
183 void *data, struct module *owner);
185 int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
186 void sysfs_remove_dir(struct kobject *kobj);
187 int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
189 int __must_check sysfs_move_dir_ns(struct kobject *kobj,
190 struct kobject *new_parent_kobj,
193 int __must_check sysfs_create_file_ns(struct kobject *kobj,
194 const struct attribute *attr,
196 int __must_check sysfs_create_files(struct kobject *kobj,
197 const struct attribute **attr);
198 int __must_check sysfs_chmod_file(struct kobject *kobj,
199 const struct attribute *attr, umode_t mode);
200 void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
202 void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
204 int __must_check sysfs_create_bin_file(struct kobject *kobj,
205 const struct bin_attribute *attr);
206 void sysfs_remove_bin_file(struct kobject *kobj,
207 const struct bin_attribute *attr);
209 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
211 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
212 struct kobject *target,
214 void sysfs_remove_link(struct kobject *kobj, const char *name);
216 int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
217 const char *old_name, const char *new_name);
219 void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
222 int __must_check sysfs_create_group(struct kobject *kobj,
223 const struct attribute_group *grp);
224 int __must_check sysfs_create_groups(struct kobject *kobj,
225 const struct attribute_group **groups);
226 int sysfs_update_group(struct kobject *kobj,
227 const struct attribute_group *grp);
228 void sysfs_remove_group(struct kobject *kobj,
229 const struct attribute_group *grp);
230 void sysfs_remove_groups(struct kobject *kobj,
231 const struct attribute_group **groups);
232 int sysfs_add_file_to_group(struct kobject *kobj,
233 const struct attribute *attr, const char *group);
234 void sysfs_remove_file_from_group(struct kobject *kobj,
235 const struct attribute *attr, const char *group);
236 int sysfs_merge_group(struct kobject *kobj,
237 const struct attribute_group *grp);
238 void sysfs_unmerge_group(struct kobject *kobj,
239 const struct attribute_group *grp);
240 int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
241 struct kobject *target, const char *link_name);
242 void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
243 const char *link_name);
245 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
246 void sysfs_notify_dirent(struct sysfs_dirent *sd);
247 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
249 const unsigned char *name);
250 struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
251 void sysfs_put(struct sysfs_dirent *sd);
253 int __must_check sysfs_init(void);
255 #else /* CONFIG_SYSFS */
257 static inline int sysfs_schedule_callback(struct kobject *kobj,
258 void (*func)(void *), void *data, struct module *owner)
263 static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
268 static inline void sysfs_remove_dir(struct kobject *kobj)
272 static inline int sysfs_rename_dir_ns(struct kobject *kobj,
273 const char *new_name, const void *new_ns)
278 static inline int sysfs_move_dir_ns(struct kobject *kobj,
279 struct kobject *new_parent_kobj,
285 static inline int sysfs_create_file_ns(struct kobject *kobj,
286 const struct attribute *attr,
292 static inline int sysfs_create_files(struct kobject *kobj,
293 const struct attribute **attr)
298 static inline int sysfs_chmod_file(struct kobject *kobj,
299 const struct attribute *attr, umode_t mode)
304 static inline void sysfs_remove_file_ns(struct kobject *kobj,
305 const struct attribute *attr,
310 static inline void sysfs_remove_files(struct kobject *kobj,
311 const struct attribute **attr)
315 static inline int sysfs_create_bin_file(struct kobject *kobj,
316 const struct bin_attribute *attr)
321 static inline void sysfs_remove_bin_file(struct kobject *kobj,
322 const struct bin_attribute *attr)
326 static inline int sysfs_create_link(struct kobject *kobj,
327 struct kobject *target, const char *name)
332 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
333 struct kobject *target,
339 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
343 static inline int sysfs_rename_link(struct kobject *k, struct kobject *t,
344 const char *old_name, const char *new_name)
349 static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
354 static inline int sysfs_create_group(struct kobject *kobj,
355 const struct attribute_group *grp)
360 static inline int sysfs_create_groups(struct kobject *kobj,
361 const struct attribute_group **groups)
366 static inline int sysfs_update_group(struct kobject *kobj,
367 const struct attribute_group *grp)
372 static inline void sysfs_remove_group(struct kobject *kobj,
373 const struct attribute_group *grp)
377 static inline void sysfs_remove_groups(struct kobject *kobj,
378 const struct attribute_group **groups)
382 static inline int sysfs_add_file_to_group(struct kobject *kobj,
383 const struct attribute *attr, const char *group)
388 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
389 const struct attribute *attr, const char *group)
393 static inline int sysfs_merge_group(struct kobject *kobj,
394 const struct attribute_group *grp)
399 static inline void sysfs_unmerge_group(struct kobject *kobj,
400 const struct attribute_group *grp)
404 static inline int sysfs_add_link_to_group(struct kobject *kobj,
405 const char *group_name, struct kobject *target,
406 const char *link_name)
411 static inline void sysfs_remove_link_from_group(struct kobject *kobj,
412 const char *group_name, const char *link_name)
416 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
420 static inline void sysfs_notify_dirent(struct sysfs_dirent *sd)
424 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
426 const unsigned char *name)
430 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
434 static inline void sysfs_put(struct sysfs_dirent *sd)
438 static inline int __must_check sysfs_init(void)
443 #endif /* CONFIG_SYSFS */
445 static inline int __must_check sysfs_create_file(struct kobject *kobj,
446 const struct attribute *attr)
448 return sysfs_create_file_ns(kobj, attr, NULL);
451 static inline void sysfs_remove_file(struct kobject *kobj,
452 const struct attribute *attr)
454 return sysfs_remove_file_ns(kobj, attr, NULL);
457 #endif /* _SYSFS_H_ */