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
  48 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  49                 struct dentry *new_dir, const char *new_name);
  50
  51 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  52                                  struct dentry *parent, u8 *value);
  53 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  54                                   struct dentry *parent, u16 *value);
  55 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  56                                   struct dentry *parent, u32 *value);
  57 struct dentry *debugfs_create_u64(const char *name, mode_t mode,
  58                                   struct dentry *parent, u64 *value);
  59 struct dentry *debugfs_create_x8(const char *name, mode_t mode,
  60                                  struct dentry *parent, u8 *value);
  61 struct dentry *debugfs_create_x16(const char *name, mode_t mode,
  62                                   struct dentry *parent, u16 *value);
  63 struct dentry *debugfs_create_x32(const char *name, mode_t mode,
  64                                   struct dentry *parent, u32 *value);
  65 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  66                                   struct dentry *parent, u32 *value);
  67
  68 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  69                                   struct dentry *parent,
  70                                   struct debugfs_blob_wrapper *blob);
  71 #else
  72
  73 #include <linux/err.h>
  74
  75 /*
  76  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  77  * so users have a chance to detect if there was a real error or not.  We don't
  78  * want to duplicate the design decision mistakes of procfs and devfs again.
  79  */
  80
  81 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  82                                         struct dentry *parent, void *data,
  83                                         const struct file_operations *fops)
  84 {
  85         return ERR_PTR(-ENODEV);
  86 }
  87
  88 static inline struct dentry *debugfs_create_dir(const char *name,
  89                                                 struct dentry *parent)
  90 {
  91         return ERR_PTR(-ENODEV);
  92 }
  93
  94 static inline struct dentry *debugfs_create_symlink(const char *name,
  95                                                     struct dentry *parent,
  96                                                     const char *dest)
  97 {
  98         return ERR_PTR(-ENODEV);
  99 }
 100
 101 static inline void debugfs_remove(struct dentry *dentry)
 102 { }
 103
 104 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 105                 struct dentry *new_dir, char *new_name)
 106 {
 107         return ERR_PTR(-ENODEV);
 108 }
 109
 110 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 111                                                struct dentry *parent,
 112                                                u8 *value)
 113 {
 114         return ERR_PTR(-ENODEV);
 115 }
 116
 117 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
 118                                                 struct dentry *parent,
 119                                                 u16 *value)
 120 {
 121         return ERR_PTR(-ENODEV);
 122 }
 123
 124 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 125                                                 struct dentry *parent,
 126                                                 u32 *value)
 127 {
 128         return ERR_PTR(-ENODEV);
 129 }
 130
 131 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 132                                                 struct dentry *parent,
 133                                                 u64 *value)
 134 {
 135         return ERR_PTR(-ENODEV);
 136 }
 137
 138 static inline struct dentry *debugfs_create_x8(const char *name, mode_t mode,
 139                                                struct dentry *parent,
 140                                                u8 *value)
 141 {
 142         return ERR_PTR(-ENODEV);
 143 }
 144
 145 static inline struct dentry *debugfs_create_x16(const char *name, mode_t mode,
 146                                                 struct dentry *parent,
 147                                                 u16 *value)
 148 {
 149         return ERR_PTR(-ENODEV);
 150 }
 151
 152 static inline struct dentry *debugfs_create_x32(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_bool(const char *name, mode_t mode,
 160                                                  struct dentry *parent,
 161                                                  u32 *value)
 162 {
 163         return ERR_PTR(-ENODEV);
 164 }
 165
 166 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 167                                   struct dentry *parent,
 168                                   struct debugfs_blob_wrapper *blob)
 169 {
 170         return ERR_PTR(-ENODEV);
 171 }
 172
 173 #endif
 174
 175 #endif