472 lines
13 KiB
C
472 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* video stream multiplexer controlled via mux control
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*
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* Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
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* Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/mux/consumer.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <media/v4l2-async.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-subdev.h>
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struct video_mux {
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struct v4l2_subdev subdev;
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struct media_pad *pads;
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struct v4l2_mbus_framefmt *format_mbus;
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struct mux_control *mux;
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struct mutex lock;
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int active;
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};
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static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
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.width = 1,
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.height = 1,
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.code = MEDIA_BUS_FMT_Y8_1X8,
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.field = V4L2_FIELD_NONE,
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};
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static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct video_mux, subdev);
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}
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static int video_mux_link_setup(struct media_entity *entity,
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const struct media_pad *local,
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const struct media_pad *remote, u32 flags)
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{
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struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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u16 source_pad = entity->num_pads - 1;
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int ret = 0;
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/*
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* The mux state is determined by the enabled sink pad link.
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* Enabling or disabling the source pad link has no effect.
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*/
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if (local->flags & MEDIA_PAD_FL_SOURCE)
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return 0;
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dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
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remote->entity->name, remote->index, local->entity->name,
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local->index, flags & MEDIA_LNK_FL_ENABLED);
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mutex_lock(&vmux->lock);
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if (flags & MEDIA_LNK_FL_ENABLED) {
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if (vmux->active == local->index)
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goto out;
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if (vmux->active >= 0) {
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ret = -EBUSY;
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goto out;
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}
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dev_dbg(sd->dev, "setting %d active\n", local->index);
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ret = mux_control_try_select(vmux->mux, local->index);
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if (ret < 0)
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goto out;
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vmux->active = local->index;
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/* Propagate the active format to the source */
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vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
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} else {
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if (vmux->active != local->index)
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goto out;
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dev_dbg(sd->dev, "going inactive\n");
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mux_control_deselect(vmux->mux);
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vmux->active = -1;
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}
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out:
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mutex_unlock(&vmux->lock);
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return ret;
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}
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static const struct media_entity_operations video_mux_ops = {
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.link_setup = video_mux_link_setup,
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.link_validate = v4l2_subdev_link_validate,
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};
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static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
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{
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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struct v4l2_subdev *upstream_sd;
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struct media_pad *pad;
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if (vmux->active == -1) {
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dev_err(sd->dev, "Can not start streaming on inactive mux\n");
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return -EINVAL;
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}
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pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
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if (!pad) {
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dev_err(sd->dev, "Failed to find remote source pad\n");
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return -ENOLINK;
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}
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if (!is_media_entity_v4l2_subdev(pad->entity)) {
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dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
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return -ENODEV;
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}
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upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
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return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
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}
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static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
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.s_stream = video_mux_s_stream,
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};
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static struct v4l2_mbus_framefmt *
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__video_mux_get_pad_format(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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unsigned int pad, u32 which)
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{
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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switch (which) {
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case V4L2_SUBDEV_FORMAT_TRY:
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return v4l2_subdev_get_try_format(sd, cfg, pad);
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case V4L2_SUBDEV_FORMAT_ACTIVE:
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return &vmux->format_mbus[pad];
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default:
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return NULL;
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}
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}
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static int video_mux_get_format(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *sdformat)
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{
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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mutex_lock(&vmux->lock);
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sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
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sdformat->which);
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mutex_unlock(&vmux->lock);
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return 0;
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}
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static int video_mux_set_format(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *sdformat)
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{
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
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struct media_pad *pad = &vmux->pads[sdformat->pad];
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u16 source_pad = sd->entity.num_pads - 1;
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mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
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sdformat->which);
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if (!mbusformat)
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return -EINVAL;
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source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
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sdformat->which);
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if (!source_mbusformat)
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return -EINVAL;
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/* No size limitations except V4L2 compliance requirements */
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v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
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&sdformat->format.height, 1, 65536, 0, 0);
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/* All formats except LVDS and vendor specific formats are acceptable */
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switch (sdformat->format.code) {
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case MEDIA_BUS_FMT_RGB444_1X12:
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case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
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case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
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case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
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case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
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case MEDIA_BUS_FMT_RGB565_1X16:
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case MEDIA_BUS_FMT_BGR565_2X8_BE:
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case MEDIA_BUS_FMT_BGR565_2X8_LE:
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case MEDIA_BUS_FMT_RGB565_2X8_BE:
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case MEDIA_BUS_FMT_RGB565_2X8_LE:
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case MEDIA_BUS_FMT_RGB666_1X18:
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case MEDIA_BUS_FMT_RBG888_1X24:
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case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
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case MEDIA_BUS_FMT_BGR888_1X24:
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case MEDIA_BUS_FMT_GBR888_1X24:
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case MEDIA_BUS_FMT_RGB888_1X24:
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case MEDIA_BUS_FMT_RGB888_2X12_BE:
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case MEDIA_BUS_FMT_RGB888_2X12_LE:
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case MEDIA_BUS_FMT_ARGB8888_1X32:
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case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
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case MEDIA_BUS_FMT_RGB101010_1X30:
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case MEDIA_BUS_FMT_RGB121212_1X36:
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case MEDIA_BUS_FMT_RGB161616_1X48:
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case MEDIA_BUS_FMT_Y8_1X8:
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case MEDIA_BUS_FMT_UV8_1X8:
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case MEDIA_BUS_FMT_UYVY8_1_5X8:
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case MEDIA_BUS_FMT_VYUY8_1_5X8:
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case MEDIA_BUS_FMT_YUYV8_1_5X8:
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case MEDIA_BUS_FMT_YVYU8_1_5X8:
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case MEDIA_BUS_FMT_UYVY8_2X8:
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case MEDIA_BUS_FMT_VYUY8_2X8:
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case MEDIA_BUS_FMT_YUYV8_2X8:
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case MEDIA_BUS_FMT_YVYU8_2X8:
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case MEDIA_BUS_FMT_Y10_1X10:
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case MEDIA_BUS_FMT_UYVY10_2X10:
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case MEDIA_BUS_FMT_VYUY10_2X10:
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case MEDIA_BUS_FMT_YUYV10_2X10:
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case MEDIA_BUS_FMT_YVYU10_2X10:
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case MEDIA_BUS_FMT_Y12_1X12:
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case MEDIA_BUS_FMT_UYVY12_2X12:
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case MEDIA_BUS_FMT_VYUY12_2X12:
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case MEDIA_BUS_FMT_YUYV12_2X12:
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case MEDIA_BUS_FMT_YVYU12_2X12:
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case MEDIA_BUS_FMT_UYVY8_1X16:
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case MEDIA_BUS_FMT_VYUY8_1X16:
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case MEDIA_BUS_FMT_YUYV8_1X16:
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case MEDIA_BUS_FMT_YVYU8_1X16:
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case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
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case MEDIA_BUS_FMT_UYVY10_1X20:
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case MEDIA_BUS_FMT_VYUY10_1X20:
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case MEDIA_BUS_FMT_YUYV10_1X20:
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case MEDIA_BUS_FMT_YVYU10_1X20:
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case MEDIA_BUS_FMT_VUY8_1X24:
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case MEDIA_BUS_FMT_YUV8_1X24:
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case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
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case MEDIA_BUS_FMT_UYVY12_1X24:
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case MEDIA_BUS_FMT_VYUY12_1X24:
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case MEDIA_BUS_FMT_YUYV12_1X24:
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case MEDIA_BUS_FMT_YVYU12_1X24:
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case MEDIA_BUS_FMT_YUV10_1X30:
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case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
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case MEDIA_BUS_FMT_AYUV8_1X32:
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case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
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case MEDIA_BUS_FMT_YUV12_1X36:
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case MEDIA_BUS_FMT_YUV16_1X48:
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case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
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case MEDIA_BUS_FMT_JPEG_1X8:
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case MEDIA_BUS_FMT_AHSV8888_1X32:
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case MEDIA_BUS_FMT_SBGGR8_1X8:
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case MEDIA_BUS_FMT_SGBRG8_1X8:
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case MEDIA_BUS_FMT_SGRBG8_1X8:
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case MEDIA_BUS_FMT_SRGGB8_1X8:
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case MEDIA_BUS_FMT_SBGGR10_1X10:
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case MEDIA_BUS_FMT_SGBRG10_1X10:
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case MEDIA_BUS_FMT_SGRBG10_1X10:
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case MEDIA_BUS_FMT_SRGGB10_1X10:
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case MEDIA_BUS_FMT_SBGGR12_1X12:
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case MEDIA_BUS_FMT_SGBRG12_1X12:
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case MEDIA_BUS_FMT_SGRBG12_1X12:
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case MEDIA_BUS_FMT_SRGGB12_1X12:
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case MEDIA_BUS_FMT_SBGGR14_1X14:
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case MEDIA_BUS_FMT_SGBRG14_1X14:
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case MEDIA_BUS_FMT_SGRBG14_1X14:
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case MEDIA_BUS_FMT_SRGGB14_1X14:
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case MEDIA_BUS_FMT_SBGGR16_1X16:
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case MEDIA_BUS_FMT_SGBRG16_1X16:
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case MEDIA_BUS_FMT_SGRBG16_1X16:
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case MEDIA_BUS_FMT_SRGGB16_1X16:
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break;
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default:
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sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
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break;
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}
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if (sdformat->format.field == V4L2_FIELD_ANY)
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sdformat->format.field = V4L2_FIELD_NONE;
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mutex_lock(&vmux->lock);
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/* Source pad mirrors active sink pad, no limitations on sink pads */
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if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
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sdformat->format = vmux->format_mbus[vmux->active];
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*mbusformat = sdformat->format;
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/* Propagate the format from an active sink to source */
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if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
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*source_mbusformat = sdformat->format;
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mutex_unlock(&vmux->lock);
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return 0;
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}
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static int video_mux_init_cfg(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg)
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{
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struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
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struct v4l2_mbus_framefmt *mbusformat;
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unsigned int i;
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mutex_lock(&vmux->lock);
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for (i = 0; i < sd->entity.num_pads; i++) {
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mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
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*mbusformat = video_mux_format_mbus_default;
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}
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mutex_unlock(&vmux->lock);
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return 0;
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}
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static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
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.init_cfg = video_mux_init_cfg,
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.get_fmt = video_mux_get_format,
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.set_fmt = video_mux_set_format,
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};
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static const struct v4l2_subdev_ops video_mux_subdev_ops = {
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.pad = &video_mux_pad_ops,
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.video = &video_mux_subdev_video_ops,
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};
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static int video_mux_parse_endpoint(struct device *dev,
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struct v4l2_fwnode_endpoint *vep,
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struct v4l2_async_subdev *asd)
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{
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/*
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* it's not an error if remote is missing on a video-mux
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* input port, return -ENOTCONN to skip this endpoint with
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* no error.
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*/
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return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
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}
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static int video_mux_async_register(struct video_mux *vmux,
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unsigned int num_input_pads)
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{
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unsigned int i, *ports;
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int ret;
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ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL);
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if (!ports)
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return -ENOMEM;
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for (i = 0; i < num_input_pads; i++)
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ports[i] = i;
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ret = v4l2_async_register_fwnode_subdev(
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&vmux->subdev, sizeof(struct v4l2_async_subdev),
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ports, num_input_pads, video_mux_parse_endpoint);
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kfree(ports);
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return ret;
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}
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static int video_mux_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct device_node *ep;
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struct video_mux *vmux;
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unsigned int num_pads = 0;
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unsigned int i;
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int ret;
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vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
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if (!vmux)
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return -ENOMEM;
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platform_set_drvdata(pdev, vmux);
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v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
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snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);
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vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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vmux->subdev.dev = dev;
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/*
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* The largest numbered port is the output port. It determines
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* total number of pads.
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*/
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for_each_endpoint_of_node(np, ep) {
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struct of_endpoint endpoint;
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of_graph_parse_endpoint(ep, &endpoint);
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num_pads = max(num_pads, endpoint.port + 1);
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}
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if (num_pads < 2) {
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dev_err(dev, "Not enough ports %d\n", num_pads);
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return -EINVAL;
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}
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vmux->mux = devm_mux_control_get(dev, NULL);
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if (IS_ERR(vmux->mux)) {
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ret = PTR_ERR(vmux->mux);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "Failed to get mux: %d\n", ret);
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return ret;
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}
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mutex_init(&vmux->lock);
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vmux->active = -1;
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vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
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GFP_KERNEL);
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if (!vmux->pads)
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return -ENOMEM;
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vmux->format_mbus = devm_kcalloc(dev, num_pads,
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sizeof(*vmux->format_mbus),
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GFP_KERNEL);
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if (!vmux->format_mbus)
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return -ENOMEM;
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for (i = 0; i < num_pads; i++) {
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vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
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: MEDIA_PAD_FL_SOURCE;
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vmux->format_mbus[i] = video_mux_format_mbus_default;
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}
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vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
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ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
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vmux->pads);
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if (ret < 0)
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return ret;
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vmux->subdev.entity.ops = &video_mux_ops;
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return video_mux_async_register(vmux, num_pads - 1);
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}
|
|
|
|
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");
|