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 #if defined(CONFIG_DEBUG_FS)
  25 struct dentry *debugfs_create_file(const char *name, mode_t mode,
  26                                    struct dentry *parent, void *data,
  27                                    struct file_operations *fops);
  28
  29 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  30
  31 void debugfs_remove(struct dentry *dentry);
  32
  33 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  34                                  struct dentry *parent, u8 *value);
  35 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  36                                   struct dentry *parent, u16 *value);
  37 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  38                                   struct dentry *parent, u32 *value);
  39 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  40                                   struct dentry *parent, u32 *value);
  41
  42 #else
  43
  44 #include <linux/err.h>
  45
  46 /*
  47  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  48  * so users have a chance to detect if there was a real error or not.  We don't
  49  * want to duplicate the design decision mistakes of procfs and devfs again.
  50  */
  51
  52 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  53                                                  struct dentry *parent,
  54                                                  void *data,
  55                                                  struct file_operations *fops)
  56 {
  57         return ERR_PTR(-ENODEV);
  58 }
  59
  60 static inline struct dentry *debugfs_create_dir(const char *name,
  61                                                 struct dentry *parent)
  62 {
  63         return ERR_PTR(-ENODEV);
  64 }
  65
  66 static inline void debugfs_remove(struct dentry *dentry)
  67 { }
  68
  69 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  70                                                struct dentry *parent,
  71                                                u8 *value)
  72 {
  73         return ERR_PTR(-ENODEV);
  74 }
  75
  76 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  77                                                 struct dentry *parent,
  78                                                 u16 *value)
  79 {
  80         return ERR_PTR(-ENODEV);
  81 }
  82
  83 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  84                                                 struct dentry *parent,
  85                                                 u32 *value)
  86 {
  87         return ERR_PTR(-ENODEV);
  88 }
  89
  90 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  91                                                  struct dentry *parent,
  92                                                  u32 *value)
  93 {
  94         return ERR_PTR(-ENODEV);
  95 }
  96
  97 #endif
  98
  99 #endif