This source file includes following definitions.
- uvc_mc_create_links
- uvc_mc_cleanup_entity
- uvc_mc_init_entity
- uvc_mc_register_entities
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9 #include <linux/kernel.h>
10 #include <linux/list.h>
11 #include <linux/videodev2.h>
12
13 #include <media/v4l2-common.h>
14
15 #include "uvcvideo.h"
16
17 static int uvc_mc_create_links(struct uvc_video_chain *chain,
18 struct uvc_entity *entity)
19 {
20 const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
21 struct media_entity *sink;
22 unsigned int i;
23 int ret;
24
25 sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
26 ? (entity->vdev ? &entity->vdev->entity : NULL)
27 : &entity->subdev.entity;
28 if (sink == NULL)
29 return 0;
30
31 for (i = 0; i < entity->num_pads; ++i) {
32 struct media_entity *source;
33 struct uvc_entity *remote;
34 u8 remote_pad;
35
36 if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
37 continue;
38
39 remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
40 if (remote == NULL)
41 return -EINVAL;
42
43 source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
44 ? (remote->vdev ? &remote->vdev->entity : NULL)
45 : &remote->subdev.entity;
46 if (source == NULL)
47 continue;
48
49 remote_pad = remote->num_pads - 1;
50 ret = media_create_pad_link(source, remote_pad,
51 sink, i, flags);
52 if (ret < 0)
53 return ret;
54 }
55
56 return 0;
57 }
58
59 static const struct v4l2_subdev_ops uvc_subdev_ops = {
60 };
61
62 void uvc_mc_cleanup_entity(struct uvc_entity *entity)
63 {
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);
68 }
69
70 static int uvc_mc_init_entity(struct uvc_video_chain *chain,
71 struct uvc_entity *entity)
72 {
73 int ret;
74
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));
79
80 ret = media_entity_pads_init(&entity->subdev.entity,
81 entity->num_pads, entity->pads);
82
83 if (ret < 0)
84 return ret;
85
86 ret = v4l2_device_register_subdev(&chain->dev->vdev,
87 &entity->subdev);
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;
93 } else
94 ret = 0;
95
96 return ret;
97 }
98
99 int uvc_mc_register_entities(struct uvc_video_chain *chain)
100 {
101 struct uvc_entity *entity;
102 int ret;
103
104 list_for_each_entry(entity, &chain->entities, chain) {
105 ret = uvc_mc_init_entity(chain, entity);
106 if (ret < 0) {
107 uvc_printk(KERN_INFO, "Failed to initialize entity for "
108 "entity %u\n", entity->id);
109 return ret;
110 }
111 }
112
113 list_for_each_entry(entity, &chain->entities, chain) {
114 ret = uvc_mc_create_links(chain, entity);
115 if (ret < 0) {
116 uvc_printk(KERN_INFO, "Failed to create links for "
117 "entity %u\n", entity->id);
118 return ret;
119 }
120 }
121
122 return 0;
123 }