mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-11 23:50:25 +00:00
98210b7f73
This patch adds a helper function that simplifies adding a so-called single_open sequence file for device drivers. The calling device driver needs to provide a read function and a device pointer. The field struct seq_file::private will reference the device pointer upon call to the read function so the driver can obtain his data from it and do its task of providing the file content using seq_printf() calls and alike. Using this helper function also gets rid of the need to specify file operations per debugfs file. Signed-off-by: Arend van Spriel <arend@broadcom.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
271 lines
7.3 KiB
C
271 lines
7.3 KiB
C
/*
|
|
* debugfs.h - a tiny little debug file system
|
|
*
|
|
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2004 IBM Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* debugfs is for people to use instead of /proc or /sys.
|
|
* See Documentation/DocBook/filesystems for more details.
|
|
*/
|
|
|
|
#ifndef _DEBUGFS_H_
|
|
#define _DEBUGFS_H_
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct file_operations;
|
|
|
|
struct debugfs_blob_wrapper {
|
|
void *data;
|
|
unsigned long size;
|
|
};
|
|
|
|
struct debugfs_reg32 {
|
|
char *name;
|
|
unsigned long offset;
|
|
};
|
|
|
|
struct debugfs_regset32 {
|
|
const struct debugfs_reg32 *regs;
|
|
int nregs;
|
|
void __iomem *base;
|
|
};
|
|
|
|
extern struct dentry *arch_debugfs_dir;
|
|
|
|
#if defined(CONFIG_DEBUG_FS)
|
|
|
|
/* declared over in file.c */
|
|
extern const struct file_operations debugfs_file_operations;
|
|
extern const struct inode_operations debugfs_link_operations;
|
|
|
|
struct dentry *debugfs_create_file(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops);
|
|
|
|
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
|
|
|
|
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
|
|
const char *dest);
|
|
|
|
void debugfs_remove(struct dentry *dentry);
|
|
void debugfs_remove_recursive(struct dentry *dentry);
|
|
|
|
struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
|
|
struct dentry *new_dir, const char *new_name);
|
|
|
|
struct dentry *debugfs_create_u8(const char *name, umode_t mode,
|
|
struct dentry *parent, u8 *value);
|
|
struct dentry *debugfs_create_u16(const char *name, umode_t mode,
|
|
struct dentry *parent, u16 *value);
|
|
struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value);
|
|
struct dentry *debugfs_create_u64(const char *name, umode_t mode,
|
|
struct dentry *parent, u64 *value);
|
|
struct dentry *debugfs_create_x8(const char *name, umode_t mode,
|
|
struct dentry *parent, u8 *value);
|
|
struct dentry *debugfs_create_x16(const char *name, umode_t mode,
|
|
struct dentry *parent, u16 *value);
|
|
struct dentry *debugfs_create_x32(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value);
|
|
struct dentry *debugfs_create_x64(const char *name, umode_t mode,
|
|
struct dentry *parent, u64 *value);
|
|
struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
|
|
struct dentry *parent, size_t *value);
|
|
struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
struct dentry *parent, atomic_t *value);
|
|
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value);
|
|
|
|
struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_blob_wrapper *blob);
|
|
|
|
struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_regset32 *regset);
|
|
|
|
int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
|
int nregs, void __iomem *base, char *prefix);
|
|
|
|
struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *array, u32 elements);
|
|
|
|
struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
|
|
struct dentry *parent,
|
|
int (*read_fn)(struct seq_file *s,
|
|
void *data));
|
|
|
|
bool debugfs_initialized(void);
|
|
|
|
#else
|
|
|
|
#include <linux/err.h>
|
|
|
|
/*
|
|
* We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
|
|
* so users have a chance to detect if there was a real error or not. We don't
|
|
* want to duplicate the design decision mistakes of procfs and devfs again.
|
|
*/
|
|
|
|
static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_dir(const char *name,
|
|
struct dentry *parent)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_symlink(const char *name,
|
|
struct dentry *parent,
|
|
const char *dest)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void debugfs_remove(struct dentry *dentry)
|
|
{ }
|
|
|
|
static inline void debugfs_remove_recursive(struct dentry *dentry)
|
|
{ }
|
|
|
|
static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
|
|
struct dentry *new_dir, char *new_name)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
size_t *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
struct dentry *parent, atomic_t *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_blob_wrapper *blob)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_regset32(const char *name,
|
|
umode_t mode, struct dentry *parent,
|
|
struct debugfs_regset32 *regset)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
|
int nregs, void __iomem *base, char *prefix)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool debugfs_initialized(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *array, u32 elements)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
|
|
const char *name,
|
|
struct dentry *parent,
|
|
int (*read_fn)(struct seq_file *s,
|
|
void *data))
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|