linux/include/linux/debugfs.h
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   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/filesystems for more details.
  13 */
  14
  15#ifndef _DEBUGFS_H_
  16#define _DEBUGFS_H_
  17
  18#include <linux/fs.h>
  19#include <linux/seq_file.h>
  20
  21#include <linux/types.h>
  22
  23struct file_operations;
  24
  25struct debugfs_blob_wrapper {
  26        void *data;
  27        unsigned long size;
  28};
  29
  30struct debugfs_reg32 {
  31        char *name;
  32        unsigned long offset;
  33};
  34
  35struct debugfs_regset32 {
  36        struct debugfs_reg32 *regs;
  37        int nregs;
  38        void __iomem *base;
  39};
  40
  41extern struct dentry *arch_debugfs_dir;
  42
  43#if defined(CONFIG_DEBUG_FS)
  44
  45/* declared over in file.c */
  46extern const struct file_operations debugfs_file_operations;
  47extern const struct inode_operations debugfs_link_operations;
  48
  49struct dentry *debugfs_create_file(const char *name, umode_t mode,
  50                                   struct dentry *parent, void *data,
  51                                   const struct file_operations *fops);
  52
  53struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  54
  55struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  56                                      const char *dest);
  57
  58void debugfs_remove(struct dentry *dentry);
  59void debugfs_remove_recursive(struct dentry *dentry);
  60
  61struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  62                struct dentry *new_dir, const char *new_name);
  63
  64struct dentry *debugfs_create_u8(const char *name, umode_t mode,
  65                                 struct dentry *parent, u8 *value);
  66struct dentry *debugfs_create_u16(const char *name, umode_t mode,
  67                                  struct dentry *parent, u16 *value);
  68struct dentry *debugfs_create_u32(const char *name, umode_t mode,
  69                                  struct dentry *parent, u32 *value);
  70struct dentry *debugfs_create_u64(const char *name, umode_t mode,
  71                                  struct dentry *parent, u64 *value);
  72struct dentry *debugfs_create_x8(const char *name, umode_t mode,
  73                                 struct dentry *parent, u8 *value);
  74struct dentry *debugfs_create_x16(const char *name, umode_t mode,
  75                                  struct dentry *parent, u16 *value);
  76struct dentry *debugfs_create_x32(const char *name, umode_t mode,
  77                                  struct dentry *parent, u32 *value);
  78struct dentry *debugfs_create_x64(const char *name, umode_t mode,
  79                                  struct dentry *parent, u64 *value);
  80struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
  81                                     struct dentry *parent, size_t *value);
  82struct dentry *debugfs_create_bool(const char *name, umode_t mode,
  83                                  struct dentry *parent, u32 *value);
  84
  85struct dentry *debugfs_create_blob(const char *name, umode_t mode,
  86                                  struct dentry *parent,
  87                                  struct debugfs_blob_wrapper *blob);
  88
  89struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
  90                                     struct dentry *parent,
  91                                     struct debugfs_regset32 *regset);
  92
  93int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
  94                         int nregs, void __iomem *base, char *prefix);
  95
  96struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
  97                                        struct dentry *parent,
  98                                        u32 *array, u32 elements);
  99
 100bool debugfs_initialized(void);
 101
 102#else
 103
 104#include <linux/err.h>
 105
 106/* 
 107 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 108 * so users have a chance to detect if there was a real error or not.  We don't
 109 * want to duplicate the design decision mistakes of procfs and devfs again.
 110 */
 111
 112static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 113                                        struct dentry *parent, void *data,
 114                                        const struct file_operations *fops)
 115{
 116        return ERR_PTR(-ENODEV);
 117}
 118
 119static inline struct dentry *debugfs_create_dir(const char *name,
 120                                                struct dentry *parent)
 121{
 122        return ERR_PTR(-ENODEV);
 123}
 124
 125static inline struct dentry *debugfs_create_symlink(const char *name,
 126                                                    struct dentry *parent,
 127                                                    const char *dest)
 128{
 129        return ERR_PTR(-ENODEV);
 130}
 131
 132static inline void debugfs_remove(struct dentry *dentry)
 133{ }
 134
 135static inline void debugfs_remove_recursive(struct dentry *dentry)
 136{ }
 137
 138static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 139                struct dentry *new_dir, char *new_name)
 140{
 141        return ERR_PTR(-ENODEV);
 142}
 143
 144static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
 145                                               struct dentry *parent,
 146                                               u8 *value)
 147{
 148        return ERR_PTR(-ENODEV);
 149}
 150
 151static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
 152                                                struct dentry *parent,
 153                                                u16 *value)
 154{
 155        return ERR_PTR(-ENODEV);
 156}
 157
 158static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
 159                                                struct dentry *parent,
 160                                                u32 *value)
 161{
 162        return ERR_PTR(-ENODEV);
 163}
 164
 165static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 166                                                struct dentry *parent,
 167                                                u64 *value)
 168{
 169        return ERR_PTR(-ENODEV);
 170}
 171
 172static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 173                                               struct dentry *parent,
 174                                               u8 *value)
 175{
 176        return ERR_PTR(-ENODEV);
 177}
 178
 179static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
 180                                                struct dentry *parent,
 181                                                u16 *value)
 182{
 183        return ERR_PTR(-ENODEV);
 184}
 185
 186static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 187                                                struct dentry *parent,
 188                                                u32 *value)
 189{
 190        return ERR_PTR(-ENODEV);
 191}
 192
 193static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 194                                     struct dentry *parent,
 195                                     size_t *value)
 196{
 197        return ERR_PTR(-ENODEV);
 198}
 199
 200static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 201                                                 struct dentry *parent,
 202                                                 u32 *value)
 203{
 204        return ERR_PTR(-ENODEV);
 205}
 206
 207static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 208                                  struct dentry *parent,
 209                                  struct debugfs_blob_wrapper *blob)
 210{
 211        return ERR_PTR(-ENODEV);
 212}
 213
 214static inline struct dentry *debugfs_create_regset32(const char *name,
 215                                   umode_t mode, struct dentry *parent,
 216                                   struct debugfs_regset32 *regset)
 217{
 218        return ERR_PTR(-ENODEV);
 219}
 220
 221static inline bool debugfs_initialized(void)
 222{
 223        return false;
 224}
 225
 226static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 227                                        struct dentry *parent,
 228                                        u32 *array, u32 elements)
 229{
 230        return ERR_PTR(-ENODEV);
 231}
 232
 233#endif
 234
 235#endif
 236
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