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>

2 files changed, 28 insertions, 6 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 284f9aa0028b..6c55ade071c3 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -435,8 +435,8 @@ 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,
-                              size_t count, loff_t *ppos)
+ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
+                               size_t count, loff_t *ppos)
 {
         char buf[3];
         u32 *val = file->private_data;
@@ -449,9 +449,10 @@ 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,
-                               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)
 {
         char buf[32];
         size_t buf_size;
@@ -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,
 };
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 420311bcee38..9beb636b97eb 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -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