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         mode_t                  (*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 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
 105                                           struct kobject *target,
 106                                           const char *name);
 107 void sysfs_remove_link(struct kobject *kobj, const char *name);
 108
 109 int __must_check sysfs_create_group(struct kobject *kobj,
 110                                     const struct attribute_group *grp);
 111 int sysfs_update_group(struct kobject *kobj,
 112                        const struct attribute_group *grp);
 113 void sysfs_remove_group(struct kobject *kobj,
 114                         const struct attribute_group *grp);
 115 int sysfs_add_file_to_group(struct kobject *kobj,
 116                         const struct attribute *attr, const char *group);
 117 void sysfs_remove_file_from_group(struct kobject *kobj,
 118                         const struct attribute *attr, const char *group);
 119
 120 void sysfs_notify(struct kobject *kobj, char *dir, char *attr);
 121
 122 extern int __must_check sysfs_init(void);
 123
 124 #else /* CONFIG_SYSFS */
 125
 126 static inline int sysfs_schedule_callback(struct kobject *kobj,
 127                 void (*func)(void *), void *data, struct module *owner)
 128 {
 129         return -ENOSYS;
 130 }
 131
 132 static inline int sysfs_create_dir(struct kobject *kobj)
 133 {
 134         return 0;
 135 }
 136
 137 static inline void sysfs_remove_dir(struct kobject *kobj)
 138 {
 139 }
 140
 141 static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
 142 {
 143         return 0;
 144 }
 145
 146 static inline int sysfs_move_dir(struct kobject *kobj,
 147                                  struct kobject *new_parent_kobj)
 148 {
 149         return 0;
 150 }
 151
 152 static inline int sysfs_create_file(struct kobject *kobj,
 153                                     const struct attribute *attr)
 154 {
 155         return 0;
 156 }
 157
 158 static inline int sysfs_chmod_file(struct kobject *kobj,
 159                                    struct attribute *attr, mode_t mode)
 160 {
 161         return 0;
 162 }
 163
 164 static inline void sysfs_remove_file(struct kobject *kobj,
 165                                      const struct attribute *attr)
 166 {
 167 }
 168
 169 static inline int sysfs_create_bin_file(struct kobject *kobj,
 170                                         struct bin_attribute *attr)
 171 {
 172         return 0;
 173 }
 174
 175 static inline void sysfs_remove_bin_file(struct kobject *kobj,
 176                                          struct bin_attribute *attr)
 177 {
 178 }
 179
 180 static inline int sysfs_create_link(struct kobject *kobj,
 181                                     struct kobject *target, const char *name)
 182 {
 183         return 0;
 184 }
 185
 186 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
 187                                            struct kobject *target,
 188                                            const char *name)
 189 {
 190         return 0;
 191 }
 192
 193 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
 194 {
 195 }
 196
 197 static inline int sysfs_create_group(struct kobject *kobj,
 198                                      const struct attribute_group *grp)
 199 {
 200         return 0;
 201 }
 202
 203 static inline int sysfs_update_group(struct kobject *kobj,
 204                                 const struct attribute_group *grp)
 205 {
 206         return 0;
 207 }
 208
 209 static inline void sysfs_remove_group(struct kobject *kobj,
 210                                       const struct attribute_group *grp)
 211 {
 212 }
 213
 214 static inline int sysfs_add_file_to_group(struct kobject *kobj,
 215                 const struct attribute *attr, const char *group)
 216 {
 217         return 0;
 218 }
 219
 220 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
 221                 const struct attribute *attr, const char *group)
 222 {
 223 }
 224
 225 static inline void sysfs_notify(struct kobject *kobj, char *dir, char *attr)
 226 {
 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_ */