media: vimc: fix control event handling

The sensor subdev didn't handle control events. Add support for this.
Found with v4l2-compliance.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/vimc/vimc-common.c

@@ -434,7 +434,9 @@ int vimc_ent_sd_register(struct vimc_ent_device *ved,
 	v4l2_set_subdevdata(sd, ved);
 
 	/* Expose this subdev to user space */
-	sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	if (sd->ctrl_handler)
+		sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
 
 	/* Initialize the media entity */
 	ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);

drivers/media/platform/vimc/vimc-sensor.c

@@ -23,6 +23,7 @@
 #include <linux/v4l2-mediabus.h>
 #include <linux/vmalloc.h>
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-subdev.h>
 #include <media/tpg/v4l2-tpg.h>
 
@@ -284,11 +285,18 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
 	return 0;
 }
 
+static struct v4l2_subdev_core_ops vimc_sen_core_ops = {
+	.log_status = v4l2_ctrl_subdev_log_status,
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
 static const struct v4l2_subdev_video_ops vimc_sen_video_ops = {
 	.s_stream = vimc_sen_s_stream,
 };
 
 static const struct v4l2_subdev_ops vimc_sen_ops = {
+	.core = &vimc_sen_core_ops,
 	.pad = &vimc_sen_pad_ops,
 	.video = &vimc_sen_video_ops,
 };