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