1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * uvc_entity.c -- USB Video Class driver
5 * Copyright (C) 2005-2011
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
9 #include <linux/kernel.h>
10 #include <linux/list.h>
11 #include <linux/videodev2.h>
13 #include <media/v4l2-common.h>
17 static int uvc_mc_create_links(struct uvc_video_chain *chain,
18 struct uvc_entity *entity)
20 const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
21 struct media_entity *sink;
25 sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
26 ? (entity->vdev ? &entity->vdev->entity : NULL)
27 : &entity->subdev.entity;
31 for (i = 0; i < entity->num_pads; ++i) {
32 struct media_entity *source;
33 struct uvc_entity *remote;
36 if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
39 remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
43 source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
44 ? (remote->vdev ? &remote->vdev->entity : NULL)
45 : &remote->subdev.entity;
49 remote_pad = remote->num_pads - 1;
50 ret = media_create_pad_link(source, remote_pad,
59 static const struct v4l2_subdev_ops uvc_subdev_ops = {
62 void uvc_mc_cleanup_entity(struct uvc_entity *entity)
64 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING)
65 media_entity_cleanup(&entity->subdev.entity);
66 else if (entity->vdev != NULL)
67 media_entity_cleanup(&entity->vdev->entity);
70 static int uvc_mc_init_entity(struct uvc_video_chain *chain,
71 struct uvc_entity *entity)
75 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) {
76 v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
77 strscpy(entity->subdev.name, entity->name,
78 sizeof(entity->subdev.name));
80 ret = media_entity_pads_init(&entity->subdev.entity,
81 entity->num_pads, entity->pads);
86 ret = v4l2_device_register_subdev(&chain->dev->vdev,
88 } else if (entity->vdev != NULL) {
89 ret = media_entity_pads_init(&entity->vdev->entity,
90 entity->num_pads, entity->pads);
91 if (entity->flags & UVC_ENTITY_FLAG_DEFAULT)
92 entity->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
99 int uvc_mc_register_entities(struct uvc_video_chain *chain)
101 struct uvc_entity *entity;
104 list_for_each_entry(entity, &chain->entities, chain) {
105 ret = uvc_mc_init_entity(chain, entity);
107 uvc_printk(KERN_INFO, "Failed to initialize entity for "
108 "entity %u\n", entity->id);
113 list_for_each_entry(entity, &chain->entities, chain) {
114 ret = uvc_mc_create_links(chain, entity);
116 uvc_printk(KERN_INFO, "Failed to create links for "
117 "entity %u\n", entity->id);