linux-kernel - [PATCH v2 2/2] media: i2c: max96717: add HAS

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Message-Id: <20240912140649.1243602-3-tomm.merciai@gmail.com>
Date: Thu, 12 Sep 2024 16:06:49 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: 
Cc: linuxfancy@...glegroups.com,
	sakari.ailus@...ux.intel.com,
	laurent.pinchart@...asonboard.com,
	tomm.merciai@...il.com,
	julien.massot@...labora.com,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] media: i2c: max96717: add HAS_EVENTS support

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@...il.com>
---
Changes Since v1:
 - Add missing .(un)subscribe_event() as suggested by LPinchart
 - Fix commit body and commit msg

 drivers/media/i2c/max96717.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/max96717.c b/drivers/media/i2c/max96717.c
index 4e85b8eb1e77..755e27271b1b 100644
--- a/drivers/media/i2c/max96717.c
+++ b/drivers/media/i2c/max96717.c
@@ -17,6 +17,7 @@
 
 #include <media/v4l2-cci.h>
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
@@ -576,6 +577,8 @@ static const struct v4l2_subdev_pad_ops max96717_pad_ops = {
 
 static const struct v4l2_subdev_core_ops max96717_subdev_core_ops = {
 	.log_status = max96717_log_status,
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
 };
 
 static const struct v4l2_subdev_internal_ops max96717_internal_ops = {
@@ -689,7 +692,8 @@ static int max96717_subdev_init(struct max96717_priv *priv)
 		goto err_free_ctrl;
 	}
 
-	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
+	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			  V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
 	priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
 	priv->sd.entity.ops = &max96717_entity_ops;
 
-- 
2.34.1