include/linux/debugfs.h

   1 /*
   2  *  debugfs.h - a tiny little debug file system
   3  *
   4  *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   5  *  Copyright (C) 2004 IBM Inc.
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License version
   9  *      2 as published by the Free Software Foundation.
  10  *
  11  *  debugfs is for people to use instead of /proc or /sys.
  12  *  See Documentation/DocBook/kernel-api for more details.
  13  */
  14
  15 #ifndef _DEBUGFS_H_
  16 #define _DEBUGFS_H_
  17
  18 #include <linux/fs.h>
  19
  20 #include <linux/types.h>
  21
  22 struct file_operations;
  23
  24 struct debugfs_blob_wrapper {
  25         void *data;
  26         unsigned long size;
  27 };
  28
  29 extern struct dentry *arch_debugfs_dir;
  30
  31 #if defined(CONFIG_DEBUG_FS)
  32
  33 /* declared over in file.c */
  34 extern const struct file_operations debugfs_file_operations;
  35 extern const struct inode_operations debugfs_link_operations;
  36
  37 struct dentry *debugfs_create_file(const char *name, mode_t mode,
  38                                    struct dentry *parent, void *data,
  39                                    const struct file_operations *fops);
  40
  41 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  42
  43 struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  44                                       const char *dest);
  45
  46 void debugfs_remove(struct dentry *dentry);
  47 void debugfs_remove_recursive(struct dentry *dentry);
  48
  49 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  50                 struct dentry *new_dir, const char *new_name);
  51
  52 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  53                                  struct dentry *parent, u8 *value);
  54 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  55                                   struct dentry *parent, u16 *value);
  56 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  57                                   struct dentry *parent, u32 *value);
  58 struct dentry *debugfs_create_u64(const char *name, mode_t mode,
  59                                   struct dentry *parent, u64 *value);
  60 struct dentry *debugfs_create_x8(const char *name, mode_t mode,
  61                                  struct dentry *parent, u8 *value);
  62 struct dentry *debugfs_create_x16(const char *name, mode_t mode,
  63                                   struct dentry *parent, u16 *value);
  64 struct dentry *debugfs_create_x32(const char *name, mode_t mode,
  65                                   struct dentry *parent, u32 *value);
  66 struct dentry *debugfs_create_size_t(const char *name, mode_t mode,
  67                                      struct dentry *parent, size_t *value);
  68 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  69                                   struct dentry *parent, u32 *value);
  70
  71 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  72                                   struct dentry *parent,
  73                                   struct debugfs_blob_wrapper *blob);
  74 #else
  75
  76 #include <linux/err.h>
  77
  78 /*
  79  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  80  * so users have a chance to detect if there was a real error or not.  We don't
  81  * want to duplicate the design decision mistakes of procfs and devfs again.
  82  */
  83
  84 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  85                                         struct dentry *parent, void *data,
  86                                         const struct file_operations *fops)
  87 {
  88         return ERR_PTR(-ENODEV);
  89 }
  90
  91 static inline struct dentry *debugfs_create_dir(const char *name,
  92                                                 struct dentry *parent)
  93 {
  94         return ERR_PTR(-ENODEV);
  95 }
  96
  97 static inline struct dentry *debugfs_create_symlink(const char *name,
  98                                                     struct dentry *parent,
  99                                                     const char *dest)
 100 {
 101         return ERR_PTR(-ENODEV);
 102 }
 103
 104 static inline void debugfs_remove(struct dentry *dentry)
 105 { }
 106
 107 static inline void debugfs_remove_recursive(struct dentry *dentry)
 108 { }
 109
 110 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 111                 struct dentry *new_dir, char *new_name)
 112 {
 113         return ERR_PTR(-ENODEV);
 114 }
 115
 116 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 117                                                struct dentry *parent,
 118                                                u8 *value)
 119 {
 120         return ERR_PTR(-ENODEV);
 121 }
 122
 123 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
 124                                                 struct dentry *parent,
 125                                                 u16 *value)
 126 {
 127         return ERR_PTR(-ENODEV);
 128 }
 129
 130 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 131                                                 struct dentry *parent,
 132                                                 u32 *value)
 133 {
 134         return ERR_PTR(-ENODEV);
 135 }
 136
 137 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 138                                                 struct dentry *parent,
 139                                                 u64 *value)
 140 {
 141         return ERR_PTR(-ENODEV);
 142 }
 143
 144 static inline struct dentry *debugfs_create_x8(const char *name, mode_t mode,
 145                                                struct dentry *parent,
 146                                                u8 *value)
 147 {
 148         return ERR_PTR(-ENODEV);
 149 }
 150
 151 static inline struct dentry *debugfs_create_x16(const char *name, mode_t mode,
 152                                                 struct dentry *parent,
 153                                                 u16 *value)
 154 {
 155         return ERR_PTR(-ENODEV);
 156 }
 157
 158 static inline struct dentry *debugfs_create_x32(const char *name, mode_t mode,
 159                                                 struct dentry *parent,
 160                                                 u32 *value)
 161 {
 162         return ERR_PTR(-ENODEV);
 163 }
 164
 165 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 166                                                  struct dentry *parent,
 167                                                  u32 *value)
 168 {
 169         return ERR_PTR(-ENODEV);
 170 }
 171
 172 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 173                                   struct dentry *parent,
 174                                   struct debugfs_blob_wrapper *blob)
 175 {
 176         return ERR_PTR(-ENODEV);
 177 }
 178
 179 #endif
 180
 181 #endif