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