media: ov2640: support log_status ioctl and event interface

This adds log_status ioctl and event interface for ov2640's v4l2 controls.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/ov2640.c

@@ -26,6 +26,7 @@
 #include <linux/videodev2.h>
 
 #include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-subdev.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-image-sizes.h>
@@ -1096,6 +1097,9 @@ static const struct v4l2_ctrl_ops ov2640_ctrl_ops = {
 };
 
 static const struct v4l2_subdev_core_ops ov2640_subdev_core_ops = {
+	.log_status = v4l2_ctrl_subdev_log_status,
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	.g_register	= ov2640_g_register,
 	.s_register	= ov2640_s_register,
@@ -1190,7 +1194,8 @@ static int ov2640_probe(struct i2c_client *client,
 		goto err_clk;
 
 	v4l2_i2c_subdev_init(&priv->subdev, client, &ov2640_subdev_ops);
-	priv->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	priv->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			      V4L2_SUBDEV_FL_HAS_EVENTS;
 	mutex_init(&priv->lock);
 	v4l2_ctrl_handler_init(&priv->hdl, 3);
 	priv->hdl.lock = &priv->lock;