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linux/drivers/media/platform/video-mux.c
Laurent Pinchart b01edcbd40 media: v4l2-async: Improve v4l2_async_notifier_add_*_subdev() API 
The functions that add an async subdev to an async subdev notifier take
as an argument the size of the container structure they need to
allocate. This is error prone, as passing an invalid size will not be
caught by the compiler. Wrap those functions in macros that take a
container type instead of a size, and cast the returned pointer to the
desired type. The compiler will catch mistakes if the incorrect type is
passed to the macro, as the assignment types won't match.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Helen Koike <helen.koike@collabora.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> (core+ti-cal)
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2021-02-06 09:18:53 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#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 <linux/slab.h>
#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
struct video_mux {
struct v4l2_subdev subdev;
struct v4l2_async_notifier notifier;
struct media_pad *pads;
struct v4l2_mbus_framefmt *format_mbus;
struct mux_control *mux;
struct mutex lock;
int active;
};
static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
.width = 1,
.height = 1,
.code = MEDIA_BUS_FMT_Y8_1X8,
.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);
}
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,
.get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
};
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;
/* No size limitations except V4L2 compliance requirements */
v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
&sdformat->format.height, 1, 65536, 0, 0);
/* All formats except LVDS and vendor specific formats are acceptable */
switch (sdformat->format.code) {
case MEDIA_BUS_FMT_RGB444_1X12:
case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
case MEDIA_BUS_FMT_RGB565_1X16:
case MEDIA_BUS_FMT_BGR565_2X8_BE:
case MEDIA_BUS_FMT_BGR565_2X8_LE:
case MEDIA_BUS_FMT_RGB565_2X8_BE:
case MEDIA_BUS_FMT_RGB565_2X8_LE:
case MEDIA_BUS_FMT_RGB666_1X18:
case MEDIA_BUS_FMT_RBG888_1X24:
case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
case MEDIA_BUS_FMT_BGR888_1X24:
case MEDIA_BUS_FMT_GBR888_1X24:
case MEDIA_BUS_FMT_RGB888_1X24:
case MEDIA_BUS_FMT_RGB888_2X12_BE:
case MEDIA_BUS_FMT_RGB888_2X12_LE:
case MEDIA_BUS_FMT_ARGB8888_1X32:
case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
case MEDIA_BUS_FMT_RGB101010_1X30:
case MEDIA_BUS_FMT_RGB121212_1X36:
case MEDIA_BUS_FMT_RGB161616_1X48:
case MEDIA_BUS_FMT_Y8_1X8:
case MEDIA_BUS_FMT_UV8_1X8:
case MEDIA_BUS_FMT_UYVY8_1_5X8:
case MEDIA_BUS_FMT_VYUY8_1_5X8:
case MEDIA_BUS_FMT_YUYV8_1_5X8:
case MEDIA_BUS_FMT_YVYU8_1_5X8:
case MEDIA_BUS_FMT_UYVY8_2X8:
case MEDIA_BUS_FMT_VYUY8_2X8:
case MEDIA_BUS_FMT_YUYV8_2X8:
case MEDIA_BUS_FMT_YVYU8_2X8:
case MEDIA_BUS_FMT_Y10_1X10:
case MEDIA_BUS_FMT_UYVY10_2X10:
case MEDIA_BUS_FMT_VYUY10_2X10:
case MEDIA_BUS_FMT_YUYV10_2X10:
case MEDIA_BUS_FMT_YVYU10_2X10:
case MEDIA_BUS_FMT_Y12_1X12:
case MEDIA_BUS_FMT_UYVY12_2X12:
case MEDIA_BUS_FMT_VYUY12_2X12:
case MEDIA_BUS_FMT_YUYV12_2X12:
case MEDIA_BUS_FMT_YVYU12_2X12:
case MEDIA_BUS_FMT_UYVY8_1X16:
case MEDIA_BUS_FMT_VYUY8_1X16:
case MEDIA_BUS_FMT_YUYV8_1X16:
case MEDIA_BUS_FMT_YVYU8_1X16:
case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
case MEDIA_BUS_FMT_UYVY10_1X20:
case MEDIA_BUS_FMT_VYUY10_1X20:
case MEDIA_BUS_FMT_YUYV10_1X20:
case MEDIA_BUS_FMT_YVYU10_1X20:
case MEDIA_BUS_FMT_VUY8_1X24:
case MEDIA_BUS_FMT_YUV8_1X24:
case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
case MEDIA_BUS_FMT_UYVY12_1X24:
case MEDIA_BUS_FMT_VYUY12_1X24:
case MEDIA_BUS_FMT_YUYV12_1X24:
case MEDIA_BUS_FMT_YVYU12_1X24:
case MEDIA_BUS_FMT_YUV10_1X30:
case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
case MEDIA_BUS_FMT_AYUV8_1X32:
case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
case MEDIA_BUS_FMT_YUV12_1X36:
case MEDIA_BUS_FMT_YUV16_1X48:
case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
case MEDIA_BUS_FMT_JPEG_1X8:
case MEDIA_BUS_FMT_AHSV8888_1X32:
case MEDIA_BUS_FMT_SBGGR8_1X8:
case MEDIA_BUS_FMT_SGBRG8_1X8:
case MEDIA_BUS_FMT_SGRBG8_1X8:
case MEDIA_BUS_FMT_SRGGB8_1X8:
case MEDIA_BUS_FMT_SBGGR10_1X10:
case MEDIA_BUS_FMT_SGBRG10_1X10:
case MEDIA_BUS_FMT_SGRBG10_1X10:
case MEDIA_BUS_FMT_SRGGB10_1X10:
case MEDIA_BUS_FMT_SBGGR12_1X12:
case MEDIA_BUS_FMT_SGBRG12_1X12:
case MEDIA_BUS_FMT_SGRBG12_1X12:
case MEDIA_BUS_FMT_SRGGB12_1X12:
case MEDIA_BUS_FMT_SBGGR14_1X14:
case MEDIA_BUS_FMT_SGBRG14_1X14:
case MEDIA_BUS_FMT_SGRBG14_1X14:
case MEDIA_BUS_FMT_SRGGB14_1X14:
case MEDIA_BUS_FMT_SBGGR16_1X16:
case MEDIA_BUS_FMT_SGBRG16_1X16:
case MEDIA_BUS_FMT_SGRBG16_1X16:
case MEDIA_BUS_FMT_SRGGB16_1X16:
break;
default:
sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
break;
}
if (sdformat->format.field == V4L2_FIELD_ANY)
sdformat->format.field = V4L2_FIELD_NONE;
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 int video_mux_init_cfg(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg)
{
struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
struct v4l2_mbus_framefmt *mbusformat;
unsigned int i;
mutex_lock(&vmux->lock);
for (i = 0; i < sd->entity.num_pads; i++) {
mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
*mbusformat = video_mux_format_mbus_default;
}
mutex_unlock(&vmux->lock);
return 0;
}
static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
.init_cfg = video_mux_init_cfg,
.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_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 v4l2_create_fwnode_links(sd, &vmux->subdev);
}
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)
{
unsigned int i;
int ret;
v4l2_async_notifier_init(&vmux->notifier);
for (i = 0; i < num_input_pads; i++) {
struct v4l2_async_subdev *asd;
struct fwnode_handle *ep;
ep = fwnode_graph_get_endpoint_by_id(
dev_fwnode(vmux->subdev.dev), i, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!ep)
continue;
asd = v4l2_async_notifier_add_fwnode_remote_subdev(
&vmux->notifier, ep, struct v4l2_async_subdev);
fwnode_handle_put(ep);
if (IS_ERR(asd)) {
ret = PTR_ERR(asd);
/* OK if asd already exists */
if (ret != -EEXIST)
return ret;
}
}
vmux->notifier.ops = &video_mux_notify_ops;
ret = v4l2_async_subdev_notifier_register(&vmux->subdev,
&vmux->notifier);
if (ret)
return ret;
return v4l2_async_register_subdev(&vmux->subdev);
}
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;
unsigned int i;
int ret;
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), "%pOFn", np);
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);
if (!vmux->pads)
return -ENOMEM;
vmux->format_mbus = devm_kcalloc(dev, num_pads,
sizeof(*vmux->format_mbus),
GFP_KERNEL);
if (!vmux->format_mbus)
return -ENOMEM;
for (i = 0; i < num_pads; i++) {
vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
: MEDIA_PAD_FL_SOURCE;
vmux->format_mbus[i] = video_mux_format_mbus_default;
}
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;
ret = video_mux_async_register(vmux, num_pads - 1);
if (ret) {
v4l2_async_notifier_unregister(&vmux->notifier);
v4l2_async_notifier_cleanup(&vmux->notifier);
}
return ret;
}
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_notifier_unregister(&vmux->notifier);
v4l2_async_notifier_cleanup(&vmux->notifier);
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");
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