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 #if defined(CONFIG_DEBUG_FS) 25 struct dentry *debugfs_create_file(const char *name, mode_t mode, 26 struct dentry *parent, void *data, 27 struct file_operations *fops); 28 29 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent); 30 31 void debugfs_remove(struct dentry *dentry); 32 33 struct dentry *debugfs_create_u8(const char *name, mode_t mode, 34 struct dentry *parent, u8 *value); 35 struct dentry *debugfs_create_u16(const char *name, mode_t mode, 36 struct dentry *parent, u16 *value); 37 struct dentry *debugfs_create_u32(const char *name, mode_t mode, 38 struct dentry *parent, u32 *value); 39 struct dentry *debugfs_create_bool(const char *name, mode_t mode, 40 struct dentry *parent, u32 *value); 41 42 #else 43 44 #include <linux/err.h> 45 46 /* 47 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled 48 * so users have a chance to detect if there was a real error or not. We don't 49 * want to duplicate the design decision mistakes of procfs and devfs again. 50 */ 51 52 static inline struct dentry *debugfs_create_file(const char *name, mode_t mode, 53 struct dentry *parent, 54 void *data, 55 struct file_operations *fops) 56 { 57 return ERR_PTR(-ENODEV); 58 } 59 60 static inline struct dentry *debugfs_create_dir(const char *name, 61 struct dentry *parent) 62 { 63 return ERR_PTR(-ENODEV); 64 } 65 66 static inline void debugfs_remove(struct dentry *dentry) 67 { } 68 69 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode, 70 struct dentry *parent, 71 u8 *value) 72 { 73 return ERR_PTR(-ENODEV); 74 } 75 76 static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode, 77 struct dentry *parent, 78 u16 *value) 79 { 80 return ERR_PTR(-ENODEV); 81 } 82 83 static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode, 84 struct dentry *parent, 85 u32 *value) 86 { 87 return ERR_PTR(-ENODEV); 88 } 89 90 static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode, 91 struct dentry *parent, 92 u32 *value) 93 { 94 return ERR_PTR(-ENODEV); 95 } 96 97 #endif 98 99 #endif 100