1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * uvc_entity.c -- USB Video Class driver 4 * 5 * Copyright (C) 2005-2011 6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com) 7 */ 8 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 } 124