V4L/DVB (9974): v4l2-dev: allow drivers to pass v4l2_device as parent

Drivers that use v4l2_device can set that as parent pointer in the v4l2_dev
field instead of using the struct device parent field.

This allows v4l2-dev.c to check whether this driver is v4l2_device based,
and if so then it can offer additional services.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 4e0db8845e04..7ad6711ee327 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -30,6 +30,7 @@
 #include <asm/system.h>
 
 #include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
 
 #define VIDEO_NUM_DEVICES       256
 #define VIDEO_NAME              "video4linux"
@@ -407,6 +408,8 @@ int video_register_device_index(struct video_device *vdev, int type, int nr,
 
         vdev->vfl_type = type;
         vdev->cdev = NULL;
+        if (vdev->v4l2_dev)
+                vdev->parent = vdev->v4l2_dev->dev;
 
         /* Part 2: find a free minor, kernel number and device index. */
 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES