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Commit 0642ef6f authored by Richard Fitzgerald's avatar Richard Fitzgerald Committed by Mark Brown
Browse files

debugfs: Export bool read/write functions 



The file read/write functions for bools have no special dependencies
on debugfs internals and are sufficiently non-trivial to be worth
exporting so clients can re-use the implementation.

Signed-off-by: default avatarRichard Fitzgerald <rf@opensource.wolfsonmicro.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent bc0195aa

fs/debugfs/file.c

+8 −6
Original line number Diff line number Diff line
@@ -435,7 +435,7 @@ struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode, 
}

EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);



static ssize_t read_file_bool(struct file *file, char __user *user_buf,

ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,

			       size_t count, loff_t *ppos)

{

	char buf[3];
@@ -449,8 +449,9 @@ static ssize_t read_file_bool(struct file *file, char __user *user_buf, 
	buf[2] = 0x00;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);

}

EXPORT_SYMBOL_GPL(debugfs_read_file_bool);



static ssize_t write_file_bool(struct file *file, const char __user *user_buf,

ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,

				size_t count, loff_t *ppos)

{

	char buf[32];
@@ -468,10 +469,11 @@ static ssize_t write_file_bool(struct file *file, const char __user *user_buf, 


	return count;

}

EXPORT_SYMBOL_GPL(debugfs_write_file_bool);



static const struct file_operations fops_bool = {

	.read =		read_file_bool,

	.write =	write_file_bool,

	.read =		debugfs_read_file_bool,

	.write =	debugfs_write_file_bool,

	.open =		simple_open,

	.llseek =	default_llseek,

};

include/linux/debugfs.h

+20 −0
Original line number Diff line number Diff line
@@ -116,6 +116,12 @@ struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name, 


bool debugfs_initialized(void);



ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,

			       size_t count, loff_t *ppos);



ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,

				size_t count, loff_t *ppos);



#else



#include <linux/err.h>
@@ -282,6 +288,20 @@ static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev, 
	return ERR_PTR(-ENODEV);

}



static inline ssize_t debugfs_read_file_bool(struct file *file,

					     char __user *user_buf,

					     size_t count, loff_t *ppos)

{

	return -ENODEV;

}



static inline ssize_t debugfs_write_file_bool(struct file *file,

					      const char __user *user_buf,

					      size_t count, loff_t *ppos)

{

	return -ENODEV;

}



#endif



#endif