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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* uvc_entity.c -- USB Video Class driver
*
* Copyright (C) 2005-2011
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include "uvcvideo.h"
static int uvc_mc_create_links(struct uvc_video_chain *chain,
struct uvc_entity *entity)
{
const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
struct media_entity *sink;
unsigned int i;
int ret;
sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
? (entity->vdev ? &entity->vdev->entity : NULL)
: &entity->subdev.entity;
if (sink == NULL)
return 0;
for (i = 0; i < entity->num_pads; ++i) {
struct media_entity *source;
struct uvc_entity *remote;
u8 remote_pad;
if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
continue;
remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
if (remote == NULL)
return -EINVAL;
source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
? (remote->vdev ? &remote->vdev->entity : NULL)
: &remote->subdev.entity;
if (source == NULL)
continue;
remote_pad = remote->num_pads - 1;
ret = media_create_pad_link(source, remote_pad,
sink, i, flags);
if (ret < 0)
return ret;
}
return 0;
}
static const struct v4l2_subdev_ops uvc_subdev_ops = {
};
void uvc_mc_cleanup_entity(struct uvc_entity *entity)
{
if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING)
media_entity_cleanup(&entity->subdev.entity);
else if (entity->vdev != NULL)
media_entity_cleanup(&entity->vdev->entity);
}
static int uvc_mc_init_entity(struct uvc_video_chain *chain,
struct uvc_entity *entity)
{
int ret;
if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
strscpy(entity->subdev.name, entity->name,
sizeof(entity->subdev.name));
ret = media_entity_pads_init(&entity->subdev.entity,
entity->num_pads, entity->pads);
if (ret < 0)
return ret;
ret = v4l2_device_register_subdev(&chain->dev->vdev,
&entity->subdev);
} else if (entity->vdev != NULL) {
ret = media_entity_pads_init(&entity->vdev->entity,
entity->num_pads, entity->pads);
if (entity->flags & UVC_ENTITY_FLAG_DEFAULT)
entity->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
} else
ret = 0;
return ret;
}
int uvc_mc_register_entities(struct uvc_video_chain *chain)
{
struct uvc_entity *entity;
int ret;
list_for_each_entry(entity, &chain->entities, chain) {
ret = uvc_mc_init_entity(chain, entity);
if (ret < 0) {
uvc_printk(KERN_INFO, "Failed to initialize entity for "
"entity %u\n", entity->id);
return ret;
}
}
list_for_each_entry(entity, &chain->entities, chain) {
ret = uvc_mc_create_links(chain, entity);
if (ret < 0) {
uvc_printk(KERN_INFO, "Failed to create links for "
"entity %u\n", entity->id);
return ret;
}
}
return 0;
}
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