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 <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_LINK         0x0020
  85 #define SYSFS_NOT_PINNED        (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_LINK)
  86
  87 #ifdef CONFIG_SYSFS
  88
  89 extern int
  90 sysfs_create_dir(struct kobject *);
  91
  92 extern void
  93 sysfs_remove_dir(struct kobject *);
  94
  95 extern int
  96 sysfs_rename_dir(struct kobject *, const char *new_name);
  97
  98 extern int
  99 sysfs_create_file(struct kobject *, const struct attribute *);
 100
 101 extern int
 102 sysfs_update_file(struct kobject *, const struct attribute *);
 103
 104 extern int
 105 sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode);
 106
 107 extern void
 108 sysfs_remove_file(struct kobject *, const struct attribute *);
 109
 110 extern int
 111 sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name);
 112
 113 extern void
 114 sysfs_remove_link(struct kobject *, const char * name);
 115
 116 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr);
 117 int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
 118
 119 int sysfs_create_group(struct kobject *, const struct attribute_group *);
 120 void sysfs_remove_group(struct kobject *, const struct attribute_group *);
 121 void sysfs_notify(struct kobject * k, char *dir, char *attr);
 122
 123 #else /* CONFIG_SYSFS */
 124
 125 static inline int sysfs_create_dir(struct kobject * k)
 126 {
 127         return 0;
 128 }
 129
 130 static inline void sysfs_remove_dir(struct kobject * k)
 131 {
 132         ;
 133 }
 134
 135 static inline int sysfs_rename_dir(struct kobject * k, const char *new_name)
 136 {
 137         return 0;
 138 }
 139
 140 static inline int sysfs_create_file(struct kobject * k, const struct attribute * a)
 141 {
 142         return 0;
 143 }
 144
 145 static inline int sysfs_update_file(struct kobject * k, const struct attribute * a)
 146 {
 147         return 0;
 148 }
 149 static inline int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
 150 {
 151         return 0;
 152 }
 153
 154 static inline void sysfs_remove_file(struct kobject * k, const struct attribute * a)
 155 {
 156         ;
 157 }
 158
 159 static inline int sysfs_create_link(struct kobject * k, struct kobject * t, const char * n)
 160 {
 161         return 0;
 162 }
 163
 164 static inline void sysfs_remove_link(struct kobject * k, const char * name)
 165 {
 166         ;
 167 }
 168
 169
 170 static inline int sysfs_create_bin_file(struct kobject * k, struct bin_attribute * a)
 171 {
 172         return 0;
 173 }
 174
 175 static inline int sysfs_remove_bin_file(struct kobject * k, struct bin_attribute * a)
 176 {
 177         return 0;
 178 }
 179
 180 static inline int sysfs_create_group(struct kobject * k, const struct attribute_group *g)
 181 {
 182         return 0;
 183 }
 184
 185 static inline void sysfs_remove_group(struct kobject * k, const struct attribute_group * g)
 186 {
 187         ;
 188 }
 189
 190 static inline void sysfs_notify(struct kobject * k, char *dir, char *attr)
 191 {
 192 }
 193
 194 #endif /* CONFIG_SYSFS */
 195
 196 #endif /* _SYSFS_H_ */