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 22struct file_operations; 23 24struct debugfs_blob_wrapper { 25 void *data; 26 unsigned long size; 27}; 28 29#if defined(CONFIG_DEBUG_FS) 30struct dentry *debugfs_create_file(const char *name, mode_t mode, 31 struct dentry *parent, void *data, 32 const struct file_operations *fops); 33 34struct dentry *debugfs_create_dir(const char *name, struct dentry *parent); 35 36struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, 37 const char *dest); 38 39void debugfs_remove(struct dentry *dentry); 40 41struct dentry *debugfs_create_u8(const char *name, mode_t mode, 42 struct dentry *parent, u8 *value); 43struct dentry *debugfs_create_u16(const char *name, mode_t mode, 44 struct dentry *parent, u16 *value); 45struct dentry *debugfs_create_u32(const char *name, mode_t mode, 46 struct dentry *parent, u32 *value); 47struct dentry *debugfs_create_u64(const char *name, mode_t mode, 48 struct dentry *parent, u64 *value); 49struct dentry *debugfs_create_bool(const char *name, mode_t mode, 50 struct dentry *parent, u32 *value); 51 52struct 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 65static 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 72static inline struct dentry *debugfs_create_dir(const char *name, 73 struct dentry *parent) 74{ 75 return ERR_PTR(-ENODEV); 76} 77 78static 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 85static inline void debugfs_remove(struct dentry *dentry) 86{ } 87 88static 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 95static 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 102static 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 109static 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 116static 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 123static 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 133