127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
|
/*
|
||
|
|
* uvc_entity.c -- USB Video Class driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2005-2011
|
||
|
|
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/list.h>
|
||
|
|
#include <linux/videodev2.h>
|
||
|
|
|
||
|
|
#include <media/v4l2-common.h>
|
||
|
|
|
||
|
|
#include "uvcvideo.h"
|
||
|
|
|
||
|
|
/* ------------------------------------------------------------------------
|
||
|
|
* Video subdevices registration and unregistration
|
||
|
|
*/
|
||
|
|
|
||
|
|
static int uvc_mc_register_entity(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_entity_create_link(source, remote_pad,
|
||
|
|
sink, i, flags);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return v4l2_device_register_subdev(&chain->dev->vdev, &entity->subdev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static 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_entity *entity)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
|
||
|
|
v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
|
||
|
|
strlcpy(entity->subdev.name, entity->name,
|
||
|
|
sizeof(entity->subdev.name));
|
||
|
|
|
||
|
|
ret = media_entity_init(&entity->subdev.entity,
|
||
|
|
entity->num_pads, entity->pads, 0);
|
||
|
|
} else if (entity->vdev != NULL) {
|
||
|
|
ret = media_entity_init(&entity->vdev->entity,
|
||
|
|
entity->num_pads, entity->pads, 0);
|
||
|
|
} 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(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_register_entity(chain, entity);
|
||
|
|
if (ret < 0) {
|
||
|
|
uvc_printk(KERN_INFO, "Failed to register entity for "
|
||
|
|
"entity %u\n", entity->id);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|