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media: platform: video-mux: Register a subdev notifier 

Parse neighbor remote devices on the video muxes input ports, add them to a
subdev notifier, and register the subdev notifier for the video mux, by
calling v4l2_async_register_fwnode_subdev().

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Steve Longerbeam 2018-09-29 15:54:10 -04:00 committed by Mauro Carvalho Chehab
parent 1634f0eded
commit c5afc789bf
2 changed files with 36 additions and 1 deletions
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1
drivers/media/platform/Kconfig
View File

@ -58,6 +58,7 @@ config VIDEO_MUX
select MULTIPLEXER
depends on VIDEO_V4L2 && OF && VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
select REGMAP
select V4L2_FWNODE
help
This driver provides support for N:1 video bus multiplexers.

36
drivers/media/platform/video-mux.c
View File

@ -21,8 +21,10 @@
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
struct video_mux {
@ -316,6 +318,38 @@ static const struct v4l2_subdev_ops video_mux_subdev_ops = {
.video = &video_mux_subdev_video_ops,
};
static int video_mux_parse_endpoint(struct device *dev,
struct v4l2_fwnode_endpoint *vep,
struct v4l2_async_subdev *asd)
{
/*
* it's not an error if remote is missing on a video-mux
* input port, return -ENOTCONN to skip this endpoint with
* no error.
*/
return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
}
static int video_mux_async_register(struct video_mux *vmux,
unsigned int num_input_pads)
{
unsigned int i, *ports;
int ret;
ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL);
if (!ports)
return -ENOMEM;
for (i = 0; i < num_input_pads; i++)
ports[i] = i;
ret = v4l2_async_register_fwnode_subdev(
&vmux->subdev, sizeof(struct v4l2_async_subdev),
ports, num_input_pads, video_mux_parse_endpoint);
kfree(ports);
return ret;
}
static int video_mux_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -383,7 +417,7 @@ static int video_mux_probe(struct platform_device *pdev)
vmux->subdev.entity.ops = &video_mux_ops;
return v4l2_async_register_subdev(&vmux->subdev);
return video_mux_async_register(vmux, num_pads - 1);
}
static int video_mux_remove(struct platform_device *pdev)