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