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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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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static int uvc_mc_create_links(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_create_pad_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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return 0;
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}
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static const 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_video_chain *chain,
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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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strscpy(entity->subdev.name, entity->name,
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sizeof(entity->subdev.name));
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ret = media_entity_pads_init(&entity->subdev.entity,
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entity->num_pads, entity->pads);
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if (ret < 0)
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return ret;
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ret = v4l2_device_register_subdev(&chain->dev->vdev,
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&entity->subdev);
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} else if (entity->vdev != NULL) {
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ret = media_entity_pads_init(&entity->vdev->entity,
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entity->num_pads, entity->pads);
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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(chain, 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_create_links(chain, entity);
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if (ret < 0) {
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uvc_printk(KERN_INFO, "Failed to create links 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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