2 * uvc_entity.c -- USB Video Class driver
4 * Copyright (C) 2005-2011
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/videodev2.h>
18 #include <media/v4l2-common.h>
22 /* ------------------------------------------------------------------------
23 * Video subdevices registration and unregistration
26 static int uvc_mc_register_entity(struct uvc_video_chain *chain,
27 struct uvc_entity *entity)
29 const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
30 struct uvc_entity *remote;
35 for (i = 0; i < entity->num_pads; ++i) {
36 struct media_entity *source;
37 struct media_entity *sink;
39 if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
42 remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
46 source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
47 ? &remote->vdev->entity : &remote->subdev.entity;
48 sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
49 ? &entity->vdev->entity : &entity->subdev.entity;
51 remote_pad = remote->num_pads - 1;
52 ret = media_entity_create_link(source, remote_pad,
58 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING)
59 ret = v4l2_device_register_subdev(&chain->dev->vdev,
65 static struct v4l2_subdev_ops uvc_subdev_ops = {
68 void uvc_mc_cleanup_entity(struct uvc_entity *entity)
70 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING)
71 media_entity_cleanup(&entity->subdev.entity);
72 else if (entity->vdev != NULL)
73 media_entity_cleanup(&entity->vdev->entity);
76 static int uvc_mc_init_entity(struct uvc_entity *entity)
80 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
81 v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
82 strlcpy(entity->subdev.name, entity->name,
83 sizeof(entity->subdev.name));
85 ret = media_entity_init(&entity->subdev.entity,
86 entity->num_pads, entity->pads, 0);
88 ret = media_entity_init(&entity->vdev->entity,
89 entity->num_pads, entity->pads, 0);
94 int uvc_mc_register_entities(struct uvc_video_chain *chain)
96 struct uvc_entity *entity;
99 list_for_each_entry(entity, &chain->entities, chain) {
100 ret = uvc_mc_init_entity(entity);
102 uvc_printk(KERN_INFO, "Failed to initialize entity for "
103 "entity %u\n", entity->id);
108 list_for_each_entry(entity, &chain->entities, chain) {
109 ret = uvc_mc_register_entity(chain, entity);
111 uvc_printk(KERN_INFO, "Failed to register entity for "
112 "entity %u\n", entity->id);