sysfs.h 5.7 KB

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