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, 4 insertions, 0 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index e0d72d2c6f0e..0a88d1d17d30 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -25,6 +25,7 @@
 #define VFL_TYPE_MAX            4
 
 struct v4l2_ioctl_callbacks;
+struct v4l2_device;
 
 /* Flag to mark the video_device struct as unregistered.
    Drivers can set this flag if they want to block all future
@@ -45,7 +46,10 @@ struct video_device
         /* sysfs */
         struct device dev;              /* v4l device */
         struct cdev *cdev;              /* character device */
+
+        /* Set either parent or v4l2_dev if your driver uses v4l2_device */
         struct device *parent;          /* device parent */
+        struct v4l2_device *v4l2_dev;   /* v4l2_device parent */
 
         /* device info */
         char name[32];