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_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 133