[media] v4l: Add a media_device pointer to the v4l2_device structure

The pointer will later be used to register/unregister media entities
when registering/unregistering a v4l2_subdev or a video_device.

With the introduction of media devices, device drivers need to store a
pointer to a driver-specific structure in the device's drvdata.
v4l2_device can't claim ownership of the drvdata anymore.

To maintain compatibility with drivers that rely on v4l2_device storing
a pointer to itself in the device's drvdata, v4l2_device_register() will
keep doing so if the drvdata is NULL.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-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-device.h b/include/media/v4l2-device.h
index 78b11e5a6db7..0c2bd3075038 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -21,6 +21,7 @@
 #ifndef _V4L2_DEVICE_H
 #define _V4L2_DEVICE_H
 
+#include <media/media-device.h>
 #include <media/v4l2-subdev.h>
 
 /* Each instance of a V4L2 device should create the v4l2_device struct,
@@ -39,6 +40,9 @@ struct v4l2_device {
            Note: dev might be NULL if there is no parent device
            as is the case with e.g. ISA devices. */
         struct device *dev;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        struct media_device *mdev;
+#endif
         /* used to keep track of the registered subdevs */
         struct list_head subdevs;
         /* lock this struct; can be used by the driver as well if this