linux-kernel - [PATCH 12/22] media: video-mux: Create media links in bound notifier

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Message-Id: <20190805233505.21167-13-slongerbeam@gmail.com>
Date:   Mon,  5 Aug 2019 16:34:55 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     linux-media@...r.kernel.org
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 12/22] media: video-mux: Create media links in bound notifier

Implement a notifier bound op to register media links from the remote
sub-device's source pads to all of the video-mux sink pads.

Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
---
 drivers/media/platform/video-mux.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/platform/video-mux.c b/drivers/media/platform/video-mux.c
index ca1cef783646..de5b0698fc1d 100644
--- a/drivers/media/platform/video-mux.c
+++ b/drivers/media/platform/video-mux.c
@@ -36,6 +36,12 @@ static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
 	.field = V4L2_FIELD_NONE,
 };
 
+static inline struct video_mux *
+notifier_to_video_mux(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct video_mux, notifier);
+}
+
 static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct video_mux, subdev);
@@ -343,6 +349,22 @@ static int video_mux_parse_endpoint(struct device *dev,
 	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 }
 
+static int video_mux_notify_bound(struct v4l2_async_notifier *notifier,
+				  struct v4l2_subdev *sd,
+				  struct v4l2_async_subdev *asd)
+{
+	struct video_mux *vmux = notifier_to_video_mux(notifier);
+
+	return media_create_fwnode_links(&vmux->subdev.entity,
+					 dev_fwnode(vmux->subdev.dev),
+					 &sd->entity,
+					 dev_fwnode(sd->dev), 0);
+}
+
+static const struct v4l2_async_notifier_operations video_mux_notify_ops = {
+	.bound = video_mux_notify_bound,
+};
+
 static int video_mux_async_register(struct video_mux *vmux,
 				    unsigned int num_input_pads)
 {
@@ -357,6 +379,8 @@ static int video_mux_async_register(struct video_mux *vmux,
 
 	v4l2_async_notifier_init(&vmux->notifier);
 
+	vmux->notifier.ops = &video_mux_notify_ops;
+
 	ret = v4l2_async_register_fwnode_subdev(
 		&vmux->subdev, &vmux->notifier,
 		sizeof(struct v4l2_async_subdev),
-- 
2.17.1