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_u64(const char *name, mode_t mode,
  48                                   struct dentry *parent, u64 *value);
  49 struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  50                                   struct dentry *parent, u32 *value);
  51
  52 struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  53                                   struct dentry *parent,
  54                                   struct debugfs_blob_wrapper *blob);
  55 #else
  56
  57 #include <linux/err.h>
  58
  59 /*
  60  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  61  * so users have a chance to detect if there was a real error or not.  We don't
  62  * want to duplicate the design decision mistakes of procfs and devfs again.
  63  */
  64
  65 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  66                                         struct dentry *parent, void *data,
  67                                         const struct file_operations *fops)
  68 {
  69         return ERR_PTR(-ENODEV);
  70 }
  71
  72 static inline struct dentry *debugfs_create_dir(const char *name,
  73                                                 struct dentry *parent)
  74 {
  75         return ERR_PTR(-ENODEV);
  76 }
  77
  78 static inline struct dentry *debugfs_create_symlink(const char *name,
  79                                                     struct dentry *parent,
  80                                                     const char *dest)
  81 {
  82         return ERR_PTR(-ENODEV);
  83 }
  84
  85 static inline void debugfs_remove(struct dentry *dentry)
  86 { }
  87
  88 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  89                                                struct dentry *parent,
  90                                                u8 *value)
  91 {
  92         return ERR_PTR(-ENODEV);
  93 }
  94
  95 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  96                                                 struct dentry *parent,
  97                                                 u16 *value)
  98 {
  99         return ERR_PTR(-ENODEV);
 100 }
 101
 102 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 103                                                 struct dentry *parent,
 104                                                 u32 *value)
 105 {
 106         return ERR_PTR(-ENODEV);
 107 }
 108
 109 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 110                                                 struct dentry *parent,
 111                                                 u64 *value)
 112 {
 113         return ERR_PTR(-ENODEV);
 114 }
 115
 116 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 117                                                  struct dentry *parent,
 118                                                  u32 *value)
 119 {
 120         return ERR_PTR(-ENODEV);
 121 }
 122
 123 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 124                                   struct dentry *parent,
 125                                   struct debugfs_blob_wrapper *blob)
 126 {
 127         return ERR_PTR(-ENODEV);
 128 }
 129
 130 #endif
 131
 132 #endif