1 /*
2 * sysfs.h - definitions for the device driver filesystem
3 *
4 * Copyright (c) 2001,2002 Patrick Mochel
5 * Copyright (c) 2004 Silicon Graphics, Inc.
6 *
7 * Please see Documentation/filesystems/sysfs.txt for more information.
8 */
9
10 #ifndef _SYSFS_H_
11 #define _SYSFS_H_
12
13 #include <asm/atomic.h>
14
15 struct kobject;
16 struct module;
17
18 struct attribute {
19 const char * name;
20 struct module * owner;
21 mode_t mode;
22 };
23
24 struct attribute_group {
25 const char * name;
26 struct attribute ** attrs;
27 };
28
29
30
31 /**
32 * Use these macros to make defining attributes easier. See include/linux/device.h
33 * for examples..
34 */
35
36 #define __ATTR(_name,_mode,_show,_store) { \
37 .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
38 .show = _show, \
39 .store = _store, \
40 }
41
42 #define __ATTR_RO(_name) { \
43 .attr = { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE }, \
44 .show = _name##_show, \
45 }
46
47 #define __ATTR_NULL { .attr = { .name = NULL } }
48
49 #define attr_name(_attr) (_attr).attr.name
50
51 struct vm_area_struct;
52
53 struct bin_attribute {
54 struct attribute attr;
55 size_t size;
56 void *private;
57 ssize_t (*read)(struct kobject *, char *, loff_t, size_t);
58 ssize_t (*write)(struct kobject *, char *, loff_t, size_t);
59 int (*mmap)(struct kobject *, struct bin_attribute *attr,
60 struct vm_area_struct *vma);
61 };
62
63 struct sysfs_ops {
64 ssize_t (*show)(struct kobject *, struct attribute *,char *);
65 ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
66 };
67
68 struct sysfs_dirent {
69 atomic_t s_count;
70 struct list_head s_sibling;
71 struct list_head s_children;
72 void * s_element;
73 int s_type;
74 umode_t s_mode;
75 struct dentry * s_dentry;
76 struct iattr * s_iattr;
77 atomic_t s_event;
78 };
79
80 #define SYSFS_ROOT 0x0001
81 #define SYSFS_DIR 0x0002
82 #define SYSFS_KOBJ_ATTR 0x0004
83 #define SYSFS_KOBJ_BIN_ATTR 0x0008
84 #define SYSFS_KOBJ_DEVICE 0x0010
85 #define SYSFS_KOBJ_LINK 0x0020
86 #define SYSFS_NOT_PINNED (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_DEVICE | SYSFS_KOBJ_LINK)
87
88 #ifdef CONFIG_SYSFS
89
90 extern int
91 sysfs_create_dir(struct kobject *);
92
93 extern void
94 sysfs_remove_dir(struct kobject *);
95
96 extern int
97 sysfs_rename_dir(struct kobject *, const char *new_name);
98
99 extern int
100 sysfs_create_file(struct kobject *, const struct attribute *);
101
102 extern int
103 sysfs_update_file(struct kobject *, const struct attribute *);
104
105 extern int
106 sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode);
107
108 extern void
109 sysfs_remove_file(struct kobject *, const struct attribute *);
110
111 extern int
112 sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name);
113
114 extern void
115 sysfs_remove_link(struct kobject *, const char * name);
116
117 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr);
118 int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
119
120 int sysfs_create_group(struct kobject *, const struct attribute_group *);
121 void sysfs_remove_group(struct kobject *, const struct attribute_group *);
122 void sysfs_notify(struct kobject * k, char *dir, char *attr);
123
124 void sysfs_create_device(struct kobject *, dev_t dev, mode_t mode);
125
126 #else /* CONFIG_SYSFS */
127
sysfs_create_dir(struct kobject * k)128 static inline int sysfs_create_dir(struct kobject * k)
129 {
130 return 0;
131 }
132
sysfs_remove_dir(struct kobject * k)133 static inline void sysfs_remove_dir(struct kobject * k)
134 {
135 ;
136 }
137
sysfs_rename_dir(struct kobject * k,const char * new_name)138 static inline int sysfs_rename_dir(struct kobject * k, const char *new_name)
139 {
140 return 0;
141 }
142
sysfs_create_file(struct kobject * k,const struct attribute * a)143 static inline int sysfs_create_file(struct kobject * k, const struct attribute * a)
144 {
145 return 0;
146 }
147
sysfs_update_file(struct kobject * k,const struct attribute * a)148 static inline int sysfs_update_file(struct kobject * k, const struct attribute * a)
149 {
150 return 0;
151 }
sysfs_chmod_file(struct kobject * kobj,struct attribute * attr,mode_t mode)152 static inline int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
153 {
154 return 0;
155 }
156
sysfs_remove_file(struct kobject * k,const struct attribute * a)157 static inline void sysfs_remove_file(struct kobject * k, const struct attribute * a)
158 {
159 ;
160 }
161
sysfs_create_link(struct kobject * k,struct kobject * t,const char * n)162 static inline int sysfs_create_link(struct kobject * k, struct kobject * t, const char * n)
163 {
164 return 0;
165 }
166
sysfs_remove_link(struct kobject * k,const char * name)167 static inline void sysfs_remove_link(struct kobject * k, const char * name)
168 {
169 ;
170 }
171
172
sysfs_create_bin_file(struct kobject * k,struct bin_attribute * a)173 static inline int sysfs_create_bin_file(struct kobject * k, struct bin_attribute * a)
174 {
175 return 0;
176 }
177
sysfs_remove_bin_file(struct kobject * k,struct bin_attribute * a)178 static inline int sysfs_remove_bin_file(struct kobject * k, struct bin_attribute * a)
179 {
180 return 0;
181 }
182
sysfs_create_group(struct kobject * k,const struct attribute_group * g)183 static inline int sysfs_create_group(struct kobject * k, const struct attribute_group *g)
184 {
185 return 0;
186 }
187
sysfs_remove_group(struct kobject * k,const struct attribute_group * g)188 static inline void sysfs_remove_group(struct kobject * k, const struct attribute_group * g)
189 {
190 ;
191 }
192
sysfs_notify(struct kobject * k,char * dir,char * attr)193 static inline void sysfs_notify(struct kobject * k, char *dir, char *attr)
194 {
195 }
196
sysfs_create_device(struct kobject * k,dev_t d,mode_t m)197 static inline void sysfs_create_device(struct kobject * k, dev_t d, mode_t m)
198 {
199 ;
200 }
201
202 #endif /* CONFIG_SYSFS */
203
204 #endif /* _SYSFS_H_ */
205