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 #if defined(CONFIG_DEBUG_FS)
  30 struct dentry *debugfs_create_file(const char *name, mode_t mode,
  31                                    struct dentry *parent, void *data,
  32                                    const struct file_operations *fops);
  33
  34 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  35
  36 struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  37                                       const char *dest);
  38
  39 void debugfs_remove(struct dentry *dentry);
  40
  41 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  42                 struct dentry *new_dir, const char *new_name);
  43
  44 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  45                                  struct dentry *parent, u8 *value);
  46 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  47                                   struct dentry *parent, u16 *value);
  48 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  49                                   struct dentry *parent, u32 *value);
  50 struct dentry *debugfs_create_u64(const char *name, mode_t mode,
  51                                   struct dentry *parent, u64 *value);
  52 struct dentry *debugfs_create_x8(const char *name, mode_t mode,
  53                                  struct dentry *parent, u8 *value);
  54 struct dentry *debugfs_create_x16(const char *name, mode_t mode,
  55                                   struct dentry *parent, u16 *value);
  56 struct dentry *debugfs_create_x32(const char *name, mode_t mode,
  57                                   struct dentry *parent, u32 *value);
  58 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  59                                   struct dentry *parent, u32 *value);
  60
  61 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  62                                   struct dentry *parent,
  63                                   struct debugfs_blob_wrapper *blob);
  64 #else
  65
  66 #include <linux/err.h>
  67
  68 /*
  69  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  70  * so users have a chance to detect if there was a real error or not.  We don't
  71  * want to duplicate the design decision mistakes of procfs and devfs again.
  72  */
  73
  74 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  75                                         struct dentry *parent, void *data,
  76                                         const struct file_operations *fops)
  77 {
  78         return ERR_PTR(-ENODEV);
  79 }
  80
  81 static inline struct dentry *debugfs_create_dir(const char *name,
  82                                                 struct dentry *parent)
  83 {
  84         return ERR_PTR(-ENODEV);
  85 }
  86
  87 static inline struct dentry *debugfs_create_symlink(const char *name,
  88                                                     struct dentry *parent,
  89                                                     const char *dest)
  90 {
  91         return ERR_PTR(-ENODEV);
  92 }
  93
  94 static inline void debugfs_remove(struct dentry *dentry)
  95 { }
  96
  97 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  98                 struct dentry *new_dir, char *new_name)
  99 {
 100         return ERR_PTR(-ENODEV);
 101 }
 102
 103 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 104                                                struct dentry *parent,
 105                                                u8 *value)
 106 {
 107         return ERR_PTR(-ENODEV);
 108 }
 109
 110 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
 111                                                 struct dentry *parent,
 112                                                 u16 *value)
 113 {
 114         return ERR_PTR(-ENODEV);
 115 }
 116
 117 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 118                                                 struct dentry *parent,
 119                                                 u32 *value)
 120 {
 121         return ERR_PTR(-ENODEV);
 122 }
 123
 124 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 125                                                 struct dentry *parent,
 126                                                 u64 *value)
 127 {
 128         return ERR_PTR(-ENODEV);
 129 }
 130
 131 static inline struct dentry *debugfs_create_x8(const char *name, mode_t mode,
 132                                                struct dentry *parent,
 133                                                u8 *value)
 134 {
 135         return ERR_PTR(-ENODEV);
 136 }
 137
 138 static inline struct dentry *debugfs_create_x16(const char *name, mode_t mode,
 139                                                 struct dentry *parent,
 140                                                 u16 *value)
 141 {
 142         return ERR_PTR(-ENODEV);
 143 }
 144
 145 static inline struct dentry *debugfs_create_x32(const char *name, mode_t mode,
 146                                                 struct dentry *parent,
 147                                                 u32 *value)
 148 {
 149         return ERR_PTR(-ENODEV);
 150 }
 151
 152 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 153                                                  struct dentry *parent,
 154                                                  u32 *value)
 155 {
 156         return ERR_PTR(-ENODEV);
 157 }
 158
 159 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 160                                   struct dentry *parent,
 161                                   struct debugfs_blob_wrapper *blob)
 162 {
 163         return ERR_PTR(-ENODEV);
 164 }
 165
 166 #endif
 167
 168 #endif