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         struct attribute        **attrs;
  36 };
  37
  38
  39
  40 /**
  41  * Use these macros to make defining attributes easier. See include/linux/device.h
  42  * for examples..
  43  */
  44
  45 #define __ATTR(_name,_mode,_show,_store) { \
  46         .attr = {.name = __stringify(_name), .mode = _mode },   \
  47         .show   = _show,                                        \
  48         .store  = _store,                                       \
  49 }
  50
  51 #define __ATTR_RO(_name) { \
  52         .attr   = { .name = __stringify(_name), .mode = 0444 }, \
  53         .show   = _name##_show,                                 \
  54 }
  55
  56 #define __ATTR_NULL { .attr = { .name = NULL } }
  57
  58 #define attr_name(_attr) (_attr).attr.name
  59
  60 struct vm_area_struct;
  61
  62 struct bin_attribute {
  63         struct attribute        attr;
  64         size_t                  size;
  65         void                    *private;
  66         ssize_t (*read)(struct kobject *, struct bin_attribute *,
  67                         char *, loff_t, size_t);
  68         ssize_t (*write)(struct kobject *, struct bin_attribute *,
  69                          char *, loff_t, size_t);
  70         int (*mmap)(struct kobject *, struct bin_attribute *attr,
  71                     struct vm_area_struct *vma);
  72 };
  73
  74 struct sysfs_ops {
  75         ssize_t (*show)(struct kobject *, struct attribute *,char *);
  76         ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
  77 };
  78
  79 #ifdef CONFIG_SYSFS
  80
  81 int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
  82                             void *data, struct module *owner);
  83
  84 int __must_check sysfs_create_dir(struct kobject *kobj);
  85 void sysfs_remove_dir(struct kobject *kobj);
  86 int __must_check sysfs_rename_dir(struct kobject *kobj, const char *new_name);
  87 int __must_check sysfs_move_dir(struct kobject *kobj,
  88                                 struct kobject *new_parent_kobj);
  89
  90 int __must_check sysfs_create_file(struct kobject *kobj,
  91                                    const struct attribute *attr);
  92 int __must_check sysfs_chmod_file(struct kobject *kobj, struct attribute *attr,
  93                                   mode_t mode);
  94 void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
  95
  96 int __must_check sysfs_create_bin_file(struct kobject *kobj,
  97                                        struct bin_attribute *attr);
  98 void sysfs_remove_bin_file(struct kobject *kobj, struct bin_attribute *attr);
  99
 100 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
 101                                    const char *name);
 102 void sysfs_remove_link(struct kobject *kobj, const char *name);
 103
 104 int __must_check sysfs_create_group(struct kobject *kobj,
 105                                     const struct attribute_group *grp);
 106 void sysfs_remove_group(struct kobject *kobj,
 107                         const struct attribute_group *grp);
 108 int sysfs_add_file_to_group(struct kobject *kobj,
 109                         const struct attribute *attr, const char *group);
 110 void sysfs_remove_file_from_group(struct kobject *kobj,
 111                         const struct attribute *attr, const char *group);
 112
 113 void sysfs_notify(struct kobject *kobj, char *dir, char *attr);
 114
 115 extern int __must_check sysfs_init(void);
 116
 117 #else /* CONFIG_SYSFS */
 118
 119 static inline int sysfs_schedule_callback(struct kobject *kobj,
 120                 void (*func)(void *), void *data, struct module *owner)
 121 {
 122         return -ENOSYS;
 123 }
 124
 125 static inline int sysfs_create_dir(struct kobject *kobj)
 126 {
 127         return 0;
 128 }
 129
 130 static inline void sysfs_remove_dir(struct kobject *kobj)
 131 {
 132         ;
 133 }
 134
 135 static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
 136 {
 137         return 0;
 138 }
 139
 140 static inline int sysfs_move_dir(struct kobject *kobj,
 141                                  struct kobject *new_parent_kobj)
 142 {
 143         return 0;
 144 }
 145
 146 static inline int sysfs_create_file(struct kobject *kobj,
 147                                     const struct attribute *attr)
 148 {
 149         return 0;
 150 }
 151
 152 static inline int sysfs_chmod_file(struct kobject *kobj,
 153                                    struct attribute *attr, mode_t mode)
 154 {
 155         return 0;
 156 }
 157
 158 static inline void sysfs_remove_file(struct kobject *kobj,
 159                                      const struct attribute *attr)
 160 {
 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 int sysfs_remove_bin_file(struct kobject *kobj,
 171                                         struct bin_attribute *attr)
 172 {
 173         return 0;
 174 }
 175
 176 static inline int sysfs_create_link(struct kobject *kobj,
 177                                     struct kobject *target, const char *name)
 178 {
 179         return 0;
 180 }
 181
 182 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
 183 {
 184         ;
 185 }
 186
 187 static inline int sysfs_create_group(struct kobject *kobj,
 188                                      const struct attribute_group *grp)
 189 {
 190         return 0;
 191 }
 192
 193 static inline void sysfs_remove_group(struct kobject *kobj,
 194                                       const struct attribute_group *grp)
 195 {
 196         ;
 197 }
 198
 199 static inline int sysfs_add_file_to_group(struct kobject *kobj,
 200                 const struct attribute *attr, const char *group)
 201 {
 202         return 0;
 203 }
 204
 205 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
 206                 const struct attribute *attr, const char *group)
 207 {
 208 }
 209
 210 static inline void sysfs_notify(struct kobject *kobj, char *dir, char *attr)
 211 {
 212 }
 213
 214 static inline int __must_check sysfs_init(void)
 215 {
 216         return 0;
 217 }
 218
 219 #endif /* CONFIG_SYSFS */
 220
 221 #endif /* _SYSFS_H_ */