media: ov5647: Support VIDIOC_SUBSCRIBE_EVENT

The driver reports the V4L2_SUBDEV_FL_HAS_EVENTS flag but does not
support subscribing and unsubscribing to events.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov5647.c

@@ -24,6 +24,7 @@
 #include <linux/videodev2.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-image-sizes.h>
 #include <media/v4l2-mediabus.h>
@@ -979,6 +980,8 @@ static int ov5647_sensor_set_register(struct v4l2_subdev *sd,
 
 /* Subdev core operations registration */
 static const struct v4l2_subdev_core_ops ov5647_subdev_core_ops = {
+	.subscribe_event	= v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event	= v4l2_event_subdev_unsubscribe,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	.g_register		= ov5647_sensor_get_register,
 	.s_register		= ov5647_sensor_set_register,