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
  75 bool debugfs_initialized(void);
  76
  77 #else
  78
  79 #include <linux/err.h>
  80
  81 /*
  82  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  83  * so users have a chance to detect if there was a real error or not.  We don't
  84  * want to duplicate the design decision mistakes of procfs and devfs again.
  85  */
  86
  87 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  88                                         struct dentry *parent, void *data,
  89                                         const struct file_operations *fops)
  90 {
  91         return ERR_PTR(-ENODEV);
  92 }
  93
  94 static inline struct dentry *debugfs_create_dir(const char *name,
  95                                                 struct dentry *parent)
  96 {
  97         return ERR_PTR(-ENODEV);
  98 }
  99
 100 static inline struct dentry *debugfs_create_symlink(const char *name,
 101                                                     struct dentry *parent,
 102                                                     const char *dest)
 103 {
 104         return ERR_PTR(-ENODEV);
 105 }
 106
 107 static inline void debugfs_remove(struct dentry *dentry)
 108 { }
 109
 110 static inline void debugfs_remove_recursive(struct dentry *dentry)
 111 { }
 112
 113 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 114                 struct dentry *new_dir, char *new_name)
 115 {
 116         return ERR_PTR(-ENODEV);
 117 }
 118
 119 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 120                                                struct dentry *parent,
 121                                                u8 *value)
 122 {
 123         return ERR_PTR(-ENODEV);
 124 }
 125
 126 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
 127                                                 struct dentry *parent,
 128                                                 u16 *value)
 129 {
 130         return ERR_PTR(-ENODEV);
 131 }
 132
 133 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 134                                                 struct dentry *parent,
 135                                                 u32 *value)
 136 {
 137         return ERR_PTR(-ENODEV);
 138 }
 139
 140 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 141                                                 struct dentry *parent,
 142                                                 u64 *value)
 143 {
 144         return ERR_PTR(-ENODEV);
 145 }
 146
 147 static inline struct dentry *debugfs_create_x8(const char *name, mode_t mode,
 148                                                struct dentry *parent,
 149                                                u8 *value)
 150 {
 151         return ERR_PTR(-ENODEV);
 152 }
 153
 154 static inline struct dentry *debugfs_create_x16(const char *name, mode_t mode,
 155                                                 struct dentry *parent,
 156                                                 u16 *value)
 157 {
 158         return ERR_PTR(-ENODEV);
 159 }
 160
 161 static inline struct dentry *debugfs_create_x32(const char *name, mode_t mode,
 162                                                 struct dentry *parent,
 163                                                 u32 *value)
 164 {
 165         return ERR_PTR(-ENODEV);
 166 }
 167
 168 static inline struct dentry *debugfs_create_size_t(const char *name, mode_t mode,
 169                                      struct dentry *parent,
 170                                      size_t *value)
 171 {
 172         return ERR_PTR(-ENODEV);
 173 }
 174
 175 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 176                                                  struct dentry *parent,
 177                                                  u32 *value)
 178 {
 179         return ERR_PTR(-ENODEV);
 180 }
 181
 182 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 183                                   struct dentry *parent,
 184                                   struct debugfs_blob_wrapper *blob)
 185 {
 186         return ERR_PTR(-ENODEV);
 187 }
 188
 189 static inline bool debugfs_initialized(void)
 190 {
 191         return false;
 192 }
 193
 194 #endif
 195
 196 #endif