[PATCH] media: i2c: ov5645: add HAS_EVENTS support

[Tommaso Merciai <tomm.merciai@gmail.com>]

Controls can be exposed to userspace via a v4l-subdevX device, and
userspace has to be able to subscribe to control events so that it is
notified when the control changes value.
Add missing HAS_EVENTS support: flag and .(un)subscribe_event().

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
---
 drivers/media/i2c/ov5645.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 0c32bd2940ec..2c5145d5c616 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -29,6 +29,7 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
@@ -1034,6 +1035,11 @@ static const struct v4l2_subdev_video_ops ov5645_video_ops = {
 	.s_stream = ov5645_s_stream,
 };
 
+static const struct v4l2_subdev_core_ops ov5645_subdev_core_ops = {
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
 static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
 	.enum_mbus_code = ov5645_enum_mbus_code,
 	.enum_frame_size = ov5645_enum_frame_size,
@@ -1043,6 +1049,7 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
 };
 
 static const struct v4l2_subdev_ops ov5645_subdev_ops = {
+	.core = &ov5645_subdev_core_ops,
 	.video = &ov5645_video_ops,
 	.pad = &ov5645_subdev_pad_ops,
 };
@@ -1178,7 +1185,8 @@ static int ov5645_probe(struct i2c_client *client)
 
 	v4l2_i2c_subdev_init(&ov5645->sd, client, &ov5645_subdev_ops);
 	ov5645->sd.internal_ops = &ov5645_internal_ops;
-	ov5645->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov5645->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			    V4L2_SUBDEV_FL_HAS_EVENTS;
 	ov5645->pad.flags = MEDIA_PAD_FL_SOURCE;
 	ov5645->sd.dev = &client->dev;
 	ov5645->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
-- 
2.34.1