media: i2c: ov9282: Support event handlers

As noted in the headers for V4L2_SUBDEV_FL_HAS_EVENTS,
"controls can send events, thus drivers exposing controls
should set this flag".

This driver exposes controls, but didn't reflect that it
could generate events. Correct this, and add the default
event handler functions.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov9282.c

@@ -13,6 +13,7 @@
 #include <linux/pm_runtime.h>
 
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
@@ -1161,6 +1162,11 @@ done_endpoint_free:
 }
 
 /* V4l2 subdevice ops */
+static const struct v4l2_subdev_core_ops ov9282_core_ops = {
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
 static const struct v4l2_subdev_video_ops ov9282_video_ops = {
 	.s_stream = ov9282_set_stream,
 };
@@ -1175,6 +1181,7 @@ static const struct v4l2_subdev_pad_ops ov9282_pad_ops = {
 };
 
 static const struct v4l2_subdev_ops ov9282_subdev_ops = {
+	.core = &ov9282_core_ops,
 	.video = &ov9282_video_ops,
 	.pad = &ov9282_pad_ops,
 };
@@ -1389,7 +1396,8 @@ static int ov9282_probe(struct i2c_client *client)
 	}
 
 	/* Initialize subdev */
-	ov9282->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov9282->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			    V4L2_SUBDEV_FL_HAS_EVENTS;
 	ov9282->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 
 	/* Initialize source pad */