mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Chris Lesiak](/assets/img/avatar_default.png)
Propagate the v4l2_mbus_framefmt to the source pad when either a sink pad is activated or when the format of the active sink pad changes. Signed-off-by: Chris Lesiak <chris.lesiak@licor.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
309 lines
8.1 KiB
C
309 lines
8.1 KiB
C
/*
|
|
* video stream multiplexer controlled via mux control
|
|
*
|
|
* Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
|
|
* Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/mux/consumer.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_graph.h>
|
|
#include <linux/platform_device.h>
|
|
#include <media/v4l2-async.h>
|
|
#include <media/v4l2-device.h>
|
|
#include <media/v4l2-subdev.h>
|
|
|
|
struct video_mux {
|
|
struct v4l2_subdev subdev;
|
|
struct media_pad *pads;
|
|
struct v4l2_mbus_framefmt *format_mbus;
|
|
struct mux_control *mux;
|
|
struct mutex lock;
|
|
int active;
|
|
};
|
|
|
|
static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
|
|
{
|
|
return container_of(sd, struct video_mux, subdev);
|
|
}
|
|
|
|
static int video_mux_link_setup(struct media_entity *entity,
|
|
const struct media_pad *local,
|
|
const struct media_pad *remote, u32 flags)
|
|
{
|
|
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
|
|
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
|
|
u16 source_pad = entity->num_pads - 1;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* The mux state is determined by the enabled sink pad link.
|
|
* Enabling or disabling the source pad link has no effect.
|
|
*/
|
|
if (local->flags & MEDIA_PAD_FL_SOURCE)
|
|
return 0;
|
|
|
|
dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
|
|
remote->entity->name, remote->index, local->entity->name,
|
|
local->index, flags & MEDIA_LNK_FL_ENABLED);
|
|
|
|
mutex_lock(&vmux->lock);
|
|
|
|
if (flags & MEDIA_LNK_FL_ENABLED) {
|
|
if (vmux->active == local->index)
|
|
goto out;
|
|
|
|
if (vmux->active >= 0) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(sd->dev, "setting %d active\n", local->index);
|
|
ret = mux_control_try_select(vmux->mux, local->index);
|
|
if (ret < 0)
|
|
goto out;
|
|
vmux->active = local->index;
|
|
|
|
/* Propagate the active format to the source */
|
|
vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
|
|
} else {
|
|
if (vmux->active != local->index)
|
|
goto out;
|
|
|
|
dev_dbg(sd->dev, "going inactive\n");
|
|
mux_control_deselect(vmux->mux);
|
|
vmux->active = -1;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&vmux->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct media_entity_operations video_mux_ops = {
|
|
.link_setup = video_mux_link_setup,
|
|
.link_validate = v4l2_subdev_link_validate,
|
|
};
|
|
|
|
static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
|
|
{
|
|
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
|
|
struct v4l2_subdev *upstream_sd;
|
|
struct media_pad *pad;
|
|
|
|
if (vmux->active == -1) {
|
|
dev_err(sd->dev, "Can not start streaming on inactive mux\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
|
|
if (!pad) {
|
|
dev_err(sd->dev, "Failed to find remote source pad\n");
|
|
return -ENOLINK;
|
|
}
|
|
|
|
if (!is_media_entity_v4l2_subdev(pad->entity)) {
|
|
dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
|
|
|
|
return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
|
|
}
|
|
|
|
static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
|
|
.s_stream = video_mux_s_stream,
|
|
};
|
|
|
|
static struct v4l2_mbus_framefmt *
|
|
__video_mux_get_pad_format(struct v4l2_subdev *sd,
|
|
struct v4l2_subdev_pad_config *cfg,
|
|
unsigned int pad, u32 which)
|
|
{
|
|
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
|
|
|
|
switch (which) {
|
|
case V4L2_SUBDEV_FORMAT_TRY:
|
|
return v4l2_subdev_get_try_format(sd, cfg, pad);
|
|
case V4L2_SUBDEV_FORMAT_ACTIVE:
|
|
return &vmux->format_mbus[pad];
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static int video_mux_get_format(struct v4l2_subdev *sd,
|
|
struct v4l2_subdev_pad_config *cfg,
|
|
struct v4l2_subdev_format *sdformat)
|
|
{
|
|
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
|
|
|
|
mutex_lock(&vmux->lock);
|
|
|
|
sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
|
|
sdformat->which);
|
|
|
|
mutex_unlock(&vmux->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int video_mux_set_format(struct v4l2_subdev *sd,
|
|
struct v4l2_subdev_pad_config *cfg,
|
|
struct v4l2_subdev_format *sdformat)
|
|
{
|
|
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
|
|
struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
|
|
struct media_pad *pad = &vmux->pads[sdformat->pad];
|
|
u16 source_pad = sd->entity.num_pads - 1;
|
|
|
|
mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
|
|
sdformat->which);
|
|
if (!mbusformat)
|
|
return -EINVAL;
|
|
|
|
source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
|
|
sdformat->which);
|
|
if (!source_mbusformat)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&vmux->lock);
|
|
|
|
/* Source pad mirrors active sink pad, no limitations on sink pads */
|
|
if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
|
|
sdformat->format = vmux->format_mbus[vmux->active];
|
|
|
|
*mbusformat = sdformat->format;
|
|
|
|
/* Propagate the format from an active sink to source */
|
|
if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
|
|
*source_mbusformat = sdformat->format;
|
|
|
|
mutex_unlock(&vmux->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
|
|
.get_fmt = video_mux_get_format,
|
|
.set_fmt = video_mux_set_format,
|
|
};
|
|
|
|
static const struct v4l2_subdev_ops video_mux_subdev_ops = {
|
|
.pad = &video_mux_pad_ops,
|
|
.video = &video_mux_subdev_video_ops,
|
|
};
|
|
|
|
static int video_mux_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *ep;
|
|
struct video_mux *vmux;
|
|
unsigned int num_pads = 0;
|
|
int ret;
|
|
int i;
|
|
|
|
vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
|
|
if (!vmux)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, vmux);
|
|
|
|
v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
|
|
snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%s", np->name);
|
|
vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
|
|
vmux->subdev.dev = dev;
|
|
|
|
/*
|
|
* The largest numbered port is the output port. It determines
|
|
* total number of pads.
|
|
*/
|
|
for_each_endpoint_of_node(np, ep) {
|
|
struct of_endpoint endpoint;
|
|
|
|
of_graph_parse_endpoint(ep, &endpoint);
|
|
num_pads = max(num_pads, endpoint.port + 1);
|
|
}
|
|
|
|
if (num_pads < 2) {
|
|
dev_err(dev, "Not enough ports %d\n", num_pads);
|
|
return -EINVAL;
|
|
}
|
|
|
|
vmux->mux = devm_mux_control_get(dev, NULL);
|
|
if (IS_ERR(vmux->mux)) {
|
|
ret = PTR_ERR(vmux->mux);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to get mux: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
mutex_init(&vmux->lock);
|
|
vmux->active = -1;
|
|
vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
|
|
GFP_KERNEL);
|
|
vmux->format_mbus = devm_kcalloc(dev, num_pads,
|
|
sizeof(*vmux->format_mbus),
|
|
GFP_KERNEL);
|
|
|
|
for (i = 0; i < num_pads - 1; i++)
|
|
vmux->pads[i].flags = MEDIA_PAD_FL_SINK;
|
|
vmux->pads[num_pads - 1].flags = MEDIA_PAD_FL_SOURCE;
|
|
|
|
vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
|
|
ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
|
|
vmux->pads);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
vmux->subdev.entity.ops = &video_mux_ops;
|
|
|
|
return v4l2_async_register_subdev(&vmux->subdev);
|
|
}
|
|
|
|
static int video_mux_remove(struct platform_device *pdev)
|
|
{
|
|
struct video_mux *vmux = platform_get_drvdata(pdev);
|
|
struct v4l2_subdev *sd = &vmux->subdev;
|
|
|
|
v4l2_async_unregister_subdev(sd);
|
|
media_entity_cleanup(&sd->entity);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id video_mux_dt_ids[] = {
|
|
{ .compatible = "video-mux", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
|
|
|
|
static struct platform_driver video_mux_driver = {
|
|
.probe = video_mux_probe,
|
|
.remove = video_mux_remove,
|
|
.driver = {
|
|
.of_match_table = video_mux_dt_ids,
|
|
.name = "video-mux",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(video_mux_driver);
|
|
|
|
MODULE_DESCRIPTION("video stream multiplexer");
|
|
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
|
|
MODULE_AUTHOR("Philipp Zabel, Pengutronix");
|
|
MODULE_LICENSE("GPL");
|