a96aa5342d
If a streaming interface has no supported format, the driver won't create a video device for the associated terminal. Fix an oops by ignoring that terminal when creating links between entities. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
127 lines
3.2 KiB
C
127 lines
3.2 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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} 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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