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8be8ec6ea5
The MEDIA_ENT_FL_DEFAULT identifies entities that are considered as default for their group and type. For video nodes, it identifies the node that application should use by default. UVC devices don't report which output terminal should be considered as the default, use the first one. Most devices have a single output terminal anyway. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* uvc_entity.c -- USB Video Class driver
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*
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* Copyright (C) 2005-2011
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-common.h>
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#include "uvcvideo.h"
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/* ------------------------------------------------------------------------
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* Video subdevices registration and unregistration
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*/
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static int uvc_mc_register_entity(struct uvc_video_chain *chain,
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struct uvc_entity *entity)
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{
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const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
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struct media_entity *sink;
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unsigned int i;
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int ret;
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sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
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? (entity->vdev ? &entity->vdev->entity : NULL)
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: &entity->subdev.entity;
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if (sink == NULL)
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return 0;
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for (i = 0; i < entity->num_pads; ++i) {
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struct media_entity *source;
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struct uvc_entity *remote;
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u8 remote_pad;
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if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
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continue;
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remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
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if (remote == NULL)
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return -EINVAL;
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source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
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? (remote->vdev ? &remote->vdev->entity : NULL)
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: &remote->subdev.entity;
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if (source == NULL)
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continue;
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remote_pad = remote->num_pads - 1;
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ret = media_entity_create_link(source, remote_pad,
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sink, i, flags);
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if (ret < 0)
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return ret;
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}
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if (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
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return 0;
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return v4l2_device_register_subdev(&chain->dev->vdev, &entity->subdev);
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}
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static struct v4l2_subdev_ops uvc_subdev_ops = {
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};
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void uvc_mc_cleanup_entity(struct uvc_entity *entity)
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{
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if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING)
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media_entity_cleanup(&entity->subdev.entity);
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else if (entity->vdev != NULL)
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media_entity_cleanup(&entity->vdev->entity);
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}
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static int uvc_mc_init_entity(struct uvc_entity *entity)
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{
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int ret;
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if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
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v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
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strlcpy(entity->subdev.name, entity->name,
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sizeof(entity->subdev.name));
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ret = media_entity_init(&entity->subdev.entity,
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entity->num_pads, entity->pads, 0);
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} else if (entity->vdev != NULL) {
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ret = media_entity_init(&entity->vdev->entity,
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entity->num_pads, entity->pads, 0);
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if (entity->flags & UVC_ENTITY_FLAG_DEFAULT)
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entity->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
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} else
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ret = 0;
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return ret;
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}
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int uvc_mc_register_entities(struct uvc_video_chain *chain)
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{
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struct uvc_entity *entity;
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int ret;
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list_for_each_entry(entity, &chain->entities, chain) {
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ret = uvc_mc_init_entity(entity);
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if (ret < 0) {
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uvc_printk(KERN_INFO, "Failed to initialize entity for "
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"entity %u\n", entity->id);
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return ret;
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}
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}
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list_for_each_entry(entity, &chain->entities, chain) {
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ret = uvc_mc_register_entity(chain, entity);
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if (ret < 0) {
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uvc_printk(KERN_INFO, "Failed to register entity for "
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"entity %u\n", entity->id);
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return ret;
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}
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}
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return 0;
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}
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