include/linux/sysfs.h

   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 <linux/compiler.h>
  14 #include <linux/errno.h>
  15 #include <linux/list.h>
  16 #include <asm/atomic.h>
  17
  18 struct kobject;
  19 struct module;
  20 struct nameidata;
  21 struct dentry;
  22
  23 struct attribute {
  24         const char              * name;
  25         struct module           * owner;
  26         mode_t                  mode;
  27 };
  28
  29 struct attribute_group {
  30         const char              * name;
  31         struct attribute        ** attrs;
  32 };
  33
  34
  35
  36 /**
  37  * Use these macros to make defining attributes easier. See include/linux/device.h
  38  * for examples..
  39  */
  40
  41 #define __ATTR(_name,_mode,_show,_store) { \
  42         .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },     \
  43         .show   = _show,                                        \
  44         .store  = _store,                                       \
  45 }
  46
  47 #define __ATTR_RO(_name) { \
  48         .attr   = { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE },   \
  49         .show   = _name##_show, \
  50 }
  51
  52 #define __ATTR_NULL { .attr = { .name = NULL } }
  53
  54 #define attr_name(_attr) (_attr).attr.name
  55
  56 struct vm_area_struct;
  57
  58 struct bin_attribute {
  59         struct attribute        attr;
  60         size_t                  size;
  61         void                    *private;
  62         ssize_t (*read)(struct kobject *, char *, loff_t, size_t);
  63         ssize_t (*write)(struct kobject *, char *, loff_t, size_t);
  64         int (*mmap)(struct kobject *, struct bin_attribute *attr,
  65                     struct vm_area_struct *vma);
  66 };
  67
  68 struct sysfs_ops {
  69         ssize_t (*show)(struct kobject *, struct attribute *,char *);
  70         ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
  71 };
  72
  73 #define SYSFS_ROOT              0x0001
  74 #define SYSFS_DIR               0x0002
  75 #define SYSFS_KOBJ_ATTR         0x0004
  76 #define SYSFS_KOBJ_BIN_ATTR     0x0008
  77 #define SYSFS_KOBJ_LINK         0x0020
  78 #define SYSFS_NOT_PINNED        (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_LINK)
  79
  80 #ifdef CONFIG_SYSFS
  81
  82 extern int sysfs_schedule_callback(struct kobject *kobj,
  83                 void (*func)(void *), void *data, struct module *owner);
  84
  85 extern int __must_check
  86 sysfs_create_dir(struct kobject *, struct dentry *);
  87
  88 extern void
  89 sysfs_remove_dir(struct kobject *);
  90
  91 extern int __must_check
  92 sysfs_rename_dir(struct kobject *, struct dentry *, const char *new_name);
  93
  94 extern int __must_check
  95 sysfs_move_dir(struct kobject *, struct kobject *);
  96
  97 extern int __must_check
  98 sysfs_create_file(struct kobject *, const struct attribute *);
  99
 100 extern int __must_check
 101 sysfs_update_file(struct kobject *, const struct attribute *);
 102
 103 extern int __must_check
 104 sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode);
 105
 106 extern void
 107 sysfs_remove_file(struct kobject *, const struct attribute *);
 108
 109 extern int __must_check
 110 sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name);
 111
 112 extern void
 113 sysfs_remove_link(struct kobject *, const char * name);
 114
 115 int __must_check sysfs_create_bin_file(struct kobject *kobj,
 116                                         struct bin_attribute *attr);
 117 void sysfs_remove_bin_file(struct kobject *kobj, struct bin_attribute *attr);
 118
 119 int __must_check sysfs_create_group(struct kobject *,
 120                                         const struct attribute_group *);
 121 void sysfs_remove_group(struct kobject *, const struct attribute_group *);
 122 int sysfs_add_file_to_group(struct kobject *kobj,
 123                 const struct attribute *attr, const char *group);
 124 void sysfs_remove_file_from_group(struct kobject *kobj,
 125                 const struct attribute *attr, const char *group);
 126
 127 void sysfs_notify(struct kobject * k, char *dir, char *attr);
 128
 129
 130 extern int sysfs_make_shadowed_dir(struct kobject *kobj,
 131         void * (*follow_link)(struct dentry *, struct nameidata *));
 132 extern struct dentry *sysfs_create_shadow_dir(struct kobject *kobj);
 133 extern void sysfs_remove_shadow_dir(struct dentry *dir);
 134
 135 extern int __must_check sysfs_init(void);
 136
 137 #else /* CONFIG_SYSFS */
 138
 139 static inline int sysfs_schedule_callback(struct kobject *kobj,
 140                 void (*func)(void *), void *data, struct module *owner)
 141 {
 142         return -ENOSYS;
 143 }
 144
 145 static inline int sysfs_create_dir(struct kobject * k, struct dentry *shadow)
 146 {
 147         return 0;
 148 }
 149
 150 static inline void sysfs_remove_dir(struct kobject * k)
 151 {
 152         ;
 153 }
 154
 155 static inline int sysfs_rename_dir(struct kobject * k,
 156                                         struct dentry *new_parent,
 157                                         const char *new_name)
 158 {
 159         return 0;
 160 }
 161
 162 static inline int sysfs_move_dir(struct kobject * k, struct kobject * new_parent)
 163 {
 164         return 0;
 165 }
 166
 167 static inline int sysfs_create_file(struct kobject * k, const struct attribute * a)
 168 {
 169         return 0;
 170 }
 171
 172 static inline int sysfs_update_file(struct kobject * k, const struct attribute * a)
 173 {
 174         return 0;
 175 }
 176 static inline int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void sysfs_remove_file(struct kobject * k, const struct attribute * a)
 182 {
 183         ;
 184 }
 185
 186 static inline int sysfs_create_link(struct kobject * k, struct kobject * t, const char * n)
 187 {
 188         return 0;
 189 }
 190
 191 static inline void sysfs_remove_link(struct kobject * k, const char * name)
 192 {
 193         ;
 194 }
 195
 196
 197 static inline int sysfs_create_bin_file(struct kobject * k, struct bin_attribute * a)
 198 {
 199         return 0;
 200 }
 201
 202 static inline int sysfs_remove_bin_file(struct kobject * k, struct bin_attribute * a)
 203 {
 204         return 0;
 205 }
 206
 207 static inline int sysfs_create_group(struct kobject * k, const struct attribute_group *g)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void sysfs_remove_group(struct kobject * k, const struct attribute_group * g)
 213 {
 214         ;
 215 }
 216
 217 static inline int sysfs_add_file_to_group(struct kobject *kobj,
 218                 const struct attribute *attr, const char *group)
 219 {
 220         return 0;
 221 }
 222
 223 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
 224                 const struct attribute *attr, const char *group)
 225 {
 226 }
 227
 228 static inline void sysfs_notify(struct kobject * k, char *dir, char *attr)
 229 {
 230 }
 231
 232 static inline int sysfs_make_shadowed_dir(struct kobject *kobj,
 233         void * (*follow_link)(struct dentry *, struct nameidata *))
 234 {
 235         return 0;
 236 }
 237
 238 static inline int __must_check sysfs_init(void)
 239 {
 240         return 0;
 241 }
 242
 243 #endif /* CONFIG_SYSFS */
 244
 245 #endif /* _SYSFS_H_ */