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 void debugfs_remove(struct dentry *dentry); 37 38 struct dentry *debugfs_create_u8(const char *name, mode_t mode, 39 struct dentry *parent, u8 *value); 40 struct dentry *debugfs_create_u16(const char *name, mode_t mode, 41 struct dentry *parent, u16 *value); 42 struct dentry *debugfs_create_u32(const char *name, mode_t mode, 43 struct dentry *parent, u32 *value); 44 struct dentry *debugfs_create_bool(const char *name, mode_t mode, 45 struct dentry *parent, u32 *value); 46 47 struct dentry *debugfs_create_blob(const char *name, mode_t mode, 48 struct dentry *parent, 49 struct debugfs_blob_wrapper *blob); 50 #else 51 52 #include <linux/err.h> 53 54 /* 55 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled 56 * so users have a chance to detect if there was a real error or not. We don't 57 * want to duplicate the design decision mistakes of procfs and devfs again. 58 */ 59 60 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode, 61 struct dentry *parent, void *data, 62 const struct file_operations *fops) 63 { 64 return ERR_PTR(-ENODEV); 65 } 66 67 static inline struct dentry *debugfs_create_dir(const char *name, 68 struct dentry *parent) 69 { 70 return ERR_PTR(-ENODEV); 71 } 72 73 static inline void debugfs_remove(struct dentry *dentry) 74 { } 75 76 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode, 77 struct dentry *parent, 78 u8 *value) 79 { 80 return ERR_PTR(-ENODEV); 81 } 82 83 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode, 84 struct dentry *parent, 85 u16 *value) 86 { 87 return ERR_PTR(-ENODEV); 88 } 89 90 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode, 91 struct dentry *parent, 92 u32 *value) 93 { 94 return ERR_PTR(-ENODEV); 95 } 96 97 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode, 98 struct dentry *parent, 99 u32 *value) 100 { 101 return ERR_PTR(-ENODEV); 102 } 103 104 static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode, 105 struct dentry *parent, 106 struct debugfs_blob_wrapper *blob) 107 { 108 return ERR_PTR(-ENODEV); 109 } 110 111 #endif 112 113 #endif 114