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 void debugfs_remove(struct dentry *dentry);
  37
  38 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  39                                  struct dentry *parent, u8 *value);
  40 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  41                                   struct dentry *parent, u16 *value);
  42 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  43                                   struct dentry *parent, u32 *value);
  44 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  45                                   struct dentry *parent, u32 *value);
  46
  47 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  48                                   struct dentry *parent,
  49                                   struct debugfs_blob_wrapper *blob);
  50 #else
  51
  52 #include <linux/err.h>
  53
  54 /*
  55  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  56  * so users have a chance to detect if there was a real error or not.  We don't
  57  * want to duplicate the design decision mistakes of procfs and devfs again.
  58  */
  59
  60 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  61                                                  struct dentry *parent,
  62                                                  void *data,
  63                                                  struct file_operations *fops)
  64 {
  65         return ERR_PTR(-ENODEV);
  66 }
  67
  68 static inline struct dentry *debugfs_create_dir(const char *name,
  69                                                 struct dentry *parent)
  70 {
  71         return ERR_PTR(-ENODEV);
  72 }
  73
  74 static inline void debugfs_remove(struct dentry *dentry)
  75 { }
  76
  77 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  78                                                struct dentry *parent,
  79                                                u8 *value)
  80 {
  81         return ERR_PTR(-ENODEV);
  82 }
  83
  84 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  85                                                 struct dentry *parent,
  86                                                 u16 *value)
  87 {
  88         return ERR_PTR(-ENODEV);
  89 }
  90
  91 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  92                                                 struct dentry *parent,
  93                                                 u32 *value)
  94 {
  95         return ERR_PTR(-ENODEV);
  96 }
  97
  98 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  99                                                  struct dentry *parent,
 100                                                  u32 *value)
 101 {
 102         return ERR_PTR(-ENODEV);
 103 }
 104
 105 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 106                                   struct dentry *parent,
 107                                   struct debugfs_blob_wrapper *blob)
 108 {
 109         return ERR_PTR(-ENODEV);
 110 }
 111
 112 #endif
 113
 114 #endif