Commit ccb32f23 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

media: v4l2-core: add v4l2_debugfs_root() 



This new function returns the dentry of the top-level debugfs "v4l2"
directory. If it does not exist yet, then it is created first.

Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent bfe703ac

drivers/media/v4l2-core/v4l2-dev.c

+14 −0
Original line number Diff line number Diff line
@@ -93,6 +93,8 @@ static struct attribute *video_device_attrs[] = { 
};

ATTRIBUTE_GROUPS(video_device);



static struct dentry *v4l2_debugfs_root_dir;



/*

 *	Active devices

 */
@@ -1118,6 +1120,16 @@ void video_unregister_device(struct video_device *vdev) 
}

EXPORT_SYMBOL(video_unregister_device);



#ifdef CONFIG_DEBUG_FS

struct dentry *v4l2_debugfs_root(void)

{

	if (!v4l2_debugfs_root_dir)

		v4l2_debugfs_root_dir = debugfs_create_dir("v4l2", NULL);

	return v4l2_debugfs_root_dir;

}

EXPORT_SYMBOL_GPL(v4l2_debugfs_root);

#endif



#if defined(CONFIG_MEDIA_CONTROLLER)



__must_check int video_device_pipeline_start(struct video_device *vdev,
@@ -1222,6 +1234,8 @@ static void __exit videodev_exit(void) 


	class_unregister(&video_class);

	unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);

	debugfs_remove_recursive(v4l2_debugfs_root_dir);

	v4l2_debugfs_root_dir = NULL;

}



subsys_initcall(videodev_init);

include/media/v4l2-dev.h

+15 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ struct v4l2_ioctl_callbacks; 
struct video_device;

struct v4l2_device;

struct v4l2_ctrl_handler;

struct dentry;



/**

 * enum v4l2_video_device_flags - Flags used by &struct video_device
@@ -539,6 +540,20 @@ static inline int video_is_registered(struct video_device *vdev) 
	return test_bit(V4L2_FL_REGISTERED, &vdev->flags);

}



/**

 * v4l2_debugfs_root - returns the dentry of the top-level "v4l2" debugfs dir

 *

 * If this directory does not yet exist, then it will be created.

 */

#ifdef CONFIG_DEBUG_FS

struct dentry *v4l2_debugfs_root(void);

#else

static inline struct dentry *v4l2_debugfs_root(void)

{

	return NULL;

}

#endif



#if defined(CONFIG_MEDIA_CONTROLLER)



/**