1 /* 2 * debugfs.h - a tiny little debug file system 3 * 4 * Copyright (C) 2004 Greg Kroah-Hartman <[email protected]> 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_rename(struct dentry *old_dir, struct dentry *old_dentry, 42 struct dentry *new_dir, const char *new_name); 43 44 struct dentry *debugfs_create_u8(const char *name, mode_t mode, 45 struct dentry *parent, u8 *value); 46 struct dentry *debugfs_create_u16(const char *name, mode_t mode, 47 struct dentry *parent, u16 *value); 48 struct dentry *debugfs_create_u32(const char *name, mode_t mode, 49 struct dentry *parent, u32 *value); 50 struct dentry *debugfs_create_u64(const char *name, mode_t mode, 51 struct dentry *parent, u64 *value); 52 struct dentry *debugfs_create_bool(const char *name, mode_t mode, 53 struct dentry *parent, u32 *value); 54 55 struct dentry *debugfs_create_blob(const char *name, mode_t mode, 56 struct dentry *parent, 57 struct debugfs_blob_wrapper *blob); 58 #else 59 60 #include <linux/err.h> 61 62 /* 63 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled 64 * so users have a chance to detect if there was a real error or not. We don't 65 * want to duplicate the design decision mistakes of procfs and devfs again. 66 */ 67 68 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode, 69 struct dentry *parent, void *data, 70 const struct file_operations *fops) 71 { 72 return ERR_PTR(-ENODEV); 73 } 74 75 static inline struct dentry *debugfs_create_dir(const char *name, 76 struct dentry *parent) 77 { 78 return ERR_PTR(-ENODEV); 79 } 80 81 static inline struct dentry *debugfs_create_symlink(const char *name, 82 struct dentry *parent, 83 const char *dest) 84 { 85 return ERR_PTR(-ENODEV); 86 } 87 88 static inline void debugfs_remove(struct dentry *dentry) 89 { } 90 91 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, 92 struct dentry *new_dir, char *new_name) 93 { 94 return ERR_PTR(-ENODEV); 95 } 96 97 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode, 98 struct dentry *parent, 99 u8 *value) 100 { 101 return ERR_PTR(-ENODEV); 102 } 103 104 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode, 105 struct dentry *parent, 106 u16 *value) 107 { 108 return ERR_PTR(-ENODEV); 109 } 110 111 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode, 112 struct dentry *parent, 113 u32 *value) 114 { 115 return ERR_PTR(-ENODEV); 116 } 117 118 static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode, 119 struct dentry *parent, 120 u64 *value) 121 { 122 return ERR_PTR(-ENODEV); 123 } 124 125 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode, 126 struct dentry *parent, 127 u32 *value) 128 { 129 return ERR_PTR(-ENODEV); 130 } 131 132 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode, 133 struct dentry *parent, 134 struct debugfs_blob_wrapper *blob) 135 { 136 return ERR_PTR(-ENODEV); 137 } 138 139 #endif 140 141 #endif 142