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 <asm/atomic.h>
26 * The *owner field is no longer used.
27 * x86 tree has been cleaned up. The owner
28 * attribute is still left for other arches.
34 #ifdef CONFIG_DEBUG_LOCK_ALLOC
35 struct lock_class_key *key;
36 struct lock_class_key skey;
41 * sysfs_attr_init - initialize a dynamically allocated sysfs attribute
42 * @attr: struct attribute to initialize
44 * Initialize a dynamically allocated struct attribute so we can
45 * make lockdep happy. This is a new requirement for attributes
46 * and initially this is only needed when lockdep is enabled.
47 * Lockdep gives a nice error when your attribute is added to
48 * sysfs if you don't have this.
50 #ifdef CONFIG_DEBUG_LOCK_ALLOC
51 #define sysfs_attr_init(attr) \
53 static struct lock_class_key __key; \
55 (attr)->key = &__key; \
58 #define sysfs_attr_init(attr) do {} while(0)
61 struct attribute_group {
63 mode_t (*is_visible)(struct kobject *,
64 struct attribute *, int);
65 struct attribute **attrs;
71 * Use these macros to make defining attributes easier. See include/linux/device.h
75 #define __ATTR(_name,_mode,_show,_store) { \
76 .attr = {.name = __stringify(_name), .mode = _mode }, \
81 #define __ATTR_RO(_name) { \
82 .attr = { .name = __stringify(_name), .mode = 0444 }, \
83 .show = _name##_show, \
86 #define __ATTR_NULL { .attr = { .name = NULL } }
88 #define attr_name(_attr) (_attr).attr.name
90 struct vm_area_struct;
92 struct bin_attribute {
93 struct attribute attr;
96 ssize_t (*read)(struct kobject *, struct bin_attribute *,
97 char *, loff_t, size_t);
98 ssize_t (*write)(struct kobject *, struct bin_attribute *,
99 char *, loff_t, size_t);
100 int (*mmap)(struct kobject *, struct bin_attribute *attr,
101 struct vm_area_struct *vma);
105 * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
106 * @attr: struct bin_attribute to initialize
108 * Initialize a dynamically allocated struct bin_attribute so we
109 * can make lockdep happy. This is a new requirement for
110 * attributes and initially this is only needed when lockdep is
111 * enabled. Lockdep gives a nice error when your attribute is
112 * added to sysfs if you don't have this.
114 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
117 ssize_t (*show)(struct kobject *, struct attribute *,char *);
118 ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
125 int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
126 void *data, struct module *owner);
128 int __must_check sysfs_create_dir(struct kobject *kobj);
129 void sysfs_remove_dir(struct kobject *kobj);
130 int __must_check sysfs_rename_dir(struct kobject *kobj, const char *new_name);
131 int __must_check sysfs_move_dir(struct kobject *kobj,
132 struct kobject *new_parent_kobj);
134 int __must_check sysfs_create_file(struct kobject *kobj,
135 const struct attribute *attr);
136 int __must_check sysfs_create_files(struct kobject *kobj,
137 const struct attribute **attr);
138 int __must_check sysfs_chmod_file(struct kobject *kobj, struct attribute *attr,
140 void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
141 void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
143 int __must_check sysfs_create_bin_file(struct kobject *kobj,
144 const struct bin_attribute *attr);
145 void sysfs_remove_bin_file(struct kobject *kobj,
146 const struct bin_attribute *attr);
148 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
150 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
151 struct kobject *target,
153 void sysfs_remove_link(struct kobject *kobj, const char *name);
155 int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
156 const char *old_name, const char *new_name);
158 void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
161 int __must_check sysfs_create_group(struct kobject *kobj,
162 const struct attribute_group *grp);
163 int sysfs_update_group(struct kobject *kobj,
164 const struct attribute_group *grp);
165 void sysfs_remove_group(struct kobject *kobj,
166 const struct attribute_group *grp);
167 int sysfs_add_file_to_group(struct kobject *kobj,
168 const struct attribute *attr, const char *group);
169 void sysfs_remove_file_from_group(struct kobject *kobj,
170 const struct attribute *attr, const char *group);
172 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
173 void sysfs_notify_dirent(struct sysfs_dirent *sd);
174 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
176 const unsigned char *name);
177 struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
178 void sysfs_put(struct sysfs_dirent *sd);
179 void sysfs_printk_last_file(void);
181 void sysfs_exit_ns(enum kobj_ns_type type, const void *tag);
183 int __must_check sysfs_init(void);
185 #else /* CONFIG_SYSFS */
187 static inline int sysfs_schedule_callback(struct kobject *kobj,
188 void (*func)(void *), void *data, struct module *owner)
193 static inline int sysfs_create_dir(struct kobject *kobj)
198 static inline void sysfs_remove_dir(struct kobject *kobj)
202 static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
207 static inline int sysfs_move_dir(struct kobject *kobj,
208 struct kobject *new_parent_kobj)
213 static inline int sysfs_create_file(struct kobject *kobj,
214 const struct attribute *attr)
219 static inline int sysfs_create_files(struct kobject *kobj,
220 const struct attribute **attr)
225 static inline int sysfs_chmod_file(struct kobject *kobj,
226 struct attribute *attr, mode_t mode)
231 static inline void sysfs_remove_file(struct kobject *kobj,
232 const struct attribute *attr)
236 static inline void sysfs_remove_files(struct kobject *kobj,
237 const struct attribute **attr)
241 static inline int sysfs_create_bin_file(struct kobject *kobj,
242 const struct bin_attribute *attr)
247 static inline void sysfs_remove_bin_file(struct kobject *kobj,
248 const struct bin_attribute *attr)
252 static inline int sysfs_create_link(struct kobject *kobj,
253 struct kobject *target, const char *name)
258 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
259 struct kobject *target,
265 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
269 static inline int sysfs_rename_link(struct kobject *k, struct kobject *t,
270 const char *old_name, const char *new_name)
275 static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
280 static inline int sysfs_create_group(struct kobject *kobj,
281 const struct attribute_group *grp)
286 static inline int sysfs_update_group(struct kobject *kobj,
287 const struct attribute_group *grp)
292 static inline void sysfs_remove_group(struct kobject *kobj,
293 const struct attribute_group *grp)
297 static inline int sysfs_add_file_to_group(struct kobject *kobj,
298 const struct attribute *attr, const char *group)
303 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
304 const struct attribute *attr, const char *group)
308 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
312 static inline void sysfs_notify_dirent(struct sysfs_dirent *sd)
316 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
318 const unsigned char *name)
322 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
326 static inline void sysfs_put(struct sysfs_dirent *sd)
330 static inline void sysfs_exit_ns(enum kobj_ns_type type, const void *tag)
334 static inline int __must_check sysfs_init(void)
339 static inline void sysfs_printk_last_file(void)
343 #endif /* CONFIG_SYSFS */
345 #endif /* _SYSFS_H_ */