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_create_u8(const char *name, mode_t mode,
  42                                  struct dentry *parent, u8 *value);
  43 struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  44                                   struct dentry *parent, u16 *value);
  45 struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  46                                   struct dentry *parent, u32 *value);
  47 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  48                                   struct dentry *parent, u32 *value);
  49
  50 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  51                                   struct dentry *parent,
  52                                   struct debugfs_blob_wrapper *blob);
  53 #else
  54
  55 #include <linux/err.h>
  56
  57 /*
  58  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  59  * so users have a chance to detect if there was a real error or not.  We don't
  60  * want to duplicate the design decision mistakes of procfs and devfs again.
  61  */
  62
  63 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  64                                         struct dentry *parent, void *data,
  65                                         const struct file_operations *fops)
  66 {
  67         return ERR_PTR(-ENODEV);
  68 }
  69
  70 static inline struct dentry *debugfs_create_dir(const char *name,
  71                                                 struct dentry *parent)
  72 {
  73         return ERR_PTR(-ENODEV);
  74 }
  75
  76 static inline struct dentry *debugfs_create_symlink(const char *name,
  77                                                     struct dentry *parent,
  78                                                     const char *dest)
  79 {
  80         return ERR_PTR(-ENODEV);
  81 }
  82
  83 static inline void debugfs_remove(struct dentry *dentry)
  84 { }
  85
  86 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  87                                                struct dentry *parent,
  88                                                u8 *value)
  89 {
  90         return ERR_PTR(-ENODEV);
  91 }
  92
  93 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  94                                                 struct dentry *parent,
  95                                                 u16 *value)
  96 {
  97         return ERR_PTR(-ENODEV);
  98 }
  99
 100 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 101                                                 struct dentry *parent,
 102                                                 u32 *value)
 103 {
 104         return ERR_PTR(-ENODEV);
 105 }
 106
 107 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 108                                                  struct dentry *parent,
 109                                                  u32 *value)
 110 {
 111         return ERR_PTR(-ENODEV);
 112 }
 113
 114 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 115                                   struct dentry *parent,
 116                                   struct debugfs_blob_wrapper *blob)
 117 {
 118         return ERR_PTR(-ENODEV);
 119 }
 120
 121 #endif
 122
 123 #endif