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  * Copyright (c) 2007 SUSE Linux Products GmbH
   7  * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
   8  *
   9  * Please see Documentation/filesystems/sysfs.txt for more information.
  10  */
  11
  12 #ifndef _SYSFS_H_
  13 #define _SYSFS_H_
  14
  15 #include <linux/compiler.h>
  16 #include <linux/errno.h>
  17 #include <linux/list.h>
  18 #include <asm/atomic.h>
  19
  20 struct kobject;
  21 struct module;
  22
  23 /* FIXME
  24  * The *owner field is no longer used, but leave around
  25  * until the tree gets cleaned up fully.
  26  */
  27 struct attribute {
  28         const char              *name;
  29         struct module           *owner;
  30         mode_t                  mode;
  31 };
  32
  33 struct attribute_group {
  34         const char              *name;
  35         int                     (*is_visible)(struct kobject *,
  36                                               struct attribute *, int);
  37         struct attribute        **attrs;
  38 };
  39
  40
  41
  42 /**
  43  * Use these macros to make defining attributes easier. See include/linux/device.h
  44  * for examples..
  45  */
  46
  47 #define __ATTR(_name,_mode,_show,_store) { \
  48         .attr = {.name = __stringify(_name), .mode = _mode },   \
  49         .show   = _show,                                        \
  50         .store  = _store,                                       \
  51 }
  52
  53 #define __ATTR_RO(_name) { \
  54         .attr   = { .name = __stringify(_name), .mode = 0444 }, \
  55         .show   = _name##_show,                                 \
  56 }
  57
  58 #define __ATTR_NULL { .attr = { .name = NULL } }
  59
  60 #define attr_name(_attr) (_attr).attr.name
  61
  62 struct vm_area_struct;
  63
  64 struct bin_attribute {
  65         struct attribute        attr;
  66         size_t                  size;
  67         void                    *private;
  68         ssize_t (*read)(struct kobject *, struct bin_attribute *,
  69                         char *, loff_t, size_t);
  70         ssize_t (*write)(struct kobject *, struct bin_attribute *,
  71                          char *, loff_t, size_t);
  72         int (*mmap)(struct kobject *, struct bin_attribute *attr,
  73                     struct vm_area_struct *vma);
  74 };
  75
  76 struct sysfs_ops {
  77         ssize_t (*show)(struct kobject *, struct attribute *,char *);
  78         ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
  79 };
  80
  81 #ifdef CONFIG_SYSFS
  82
  83 int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
  84                             void *data, struct module *owner);
  85
  86 int __must_check sysfs_create_dir(struct kobject *kobj);
  87 void sysfs_remove_dir(struct kobject *kobj);
  88 int __must_check sysfs_rename_dir(struct kobject *kobj, const char *new_name);
  89 int __must_check sysfs_move_dir(struct kobject *kobj,
  90                                 struct kobject *new_parent_kobj);
  91
  92 int __must_check sysfs_create_file(struct kobject *kobj,
  93                                    const struct attribute *attr);
  94 int __must_check sysfs_chmod_file(struct kobject *kobj, struct attribute *attr,
  95                                   mode_t mode);
  96 void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
  97
  98 int __must_check sysfs_create_bin_file(struct kobject *kobj,
  99                                        struct bin_attribute *attr);
 100 void sysfs_remove_bin_file(struct kobject *kobj, struct bin_attribute *attr);
 101
 102 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
 103                                    const char *name);
 104 void sysfs_remove_link(struct kobject *kobj, const char *name);
 105
 106 int __must_check sysfs_create_group(struct kobject *kobj,
 107                                     const struct attribute_group *grp);
 108 void sysfs_remove_group(struct kobject *kobj,
 109                         const struct attribute_group *grp);
 110 int sysfs_add_file_to_group(struct kobject *kobj,
 111                         const struct attribute *attr, const char *group);
 112 void sysfs_remove_file_from_group(struct kobject *kobj,
 113                         const struct attribute *attr, const char *group);
 114
 115 void sysfs_notify(struct kobject *kobj, char *dir, char *attr);
 116
 117 extern int __must_check sysfs_init(void);
 118
 119 #else /* CONFIG_SYSFS */
 120
 121 static inline int sysfs_schedule_callback(struct kobject *kobj,
 122                 void (*func)(void *), void *data, struct module *owner)
 123 {
 124         return -ENOSYS;
 125 }
 126
 127 static inline int sysfs_create_dir(struct kobject *kobj)
 128 {
 129         return 0;
 130 }
 131
 132 static inline void sysfs_remove_dir(struct kobject *kobj)
 133 {
 134 }
 135
 136 static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
 137 {
 138         return 0;
 139 }
 140
 141 static inline int sysfs_move_dir(struct kobject *kobj,
 142                                  struct kobject *new_parent_kobj)
 143 {
 144         return 0;
 145 }
 146
 147 static inline int sysfs_create_file(struct kobject *kobj,
 148                                     const struct attribute *attr)
 149 {
 150         return 0;
 151 }
 152
 153 static inline int sysfs_chmod_file(struct kobject *kobj,
 154                                    struct attribute *attr, mode_t mode)
 155 {
 156         return 0;
 157 }
 158
 159 static inline void sysfs_remove_file(struct kobject *kobj,
 160                                      const struct attribute *attr)
 161 {
 162 }
 163
 164 static inline int sysfs_create_bin_file(struct kobject *kobj,
 165                                         struct bin_attribute *attr)
 166 {
 167         return 0;
 168 }
 169
 170 static inline void sysfs_remove_bin_file(struct kobject *kobj,
 171                                          struct bin_attribute *attr)
 172 {
 173 }
 174
 175 static inline int sysfs_create_link(struct kobject *kobj,
 176                                     struct kobject *target, const char *name)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
 182 {
 183 }
 184
 185 static inline int sysfs_create_group(struct kobject *kobj,
 186                                      const struct attribute_group *grp)
 187 {
 188         return 0;
 189 }
 190
 191 static inline void sysfs_remove_group(struct kobject *kobj,
 192                                       const struct attribute_group *grp)
 193 {
 194 }
 195
 196 static inline int sysfs_add_file_to_group(struct kobject *kobj,
 197                 const struct attribute *attr, const char *group)
 198 {
 199         return 0;
 200 }
 201
 202 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
 203                 const struct attribute *attr, const char *group)
 204 {
 205 }
 206
 207 static inline void sysfs_notify(struct kobject *kobj, char *dir, char *attr)
 208 {
 209 }
 210
 211 static inline int __must_check sysfs_init(void)
 212 {
 213         return 0;
 214 }
 215
 216 #endif /* CONFIG_SYSFS */
 217
 218 #endif /* _SYSFS_H_ */