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: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 420311b..9beb636 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -116,6 +116,12 @@
 
 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 @@
 	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