1 /* 2 * uvc_entity.c -- USB Video Class driver 3 * 4 * Copyright (C) 2005-2011 5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com) 6 * 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. 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/list.h> 16 #include <linux/videodev2.h> 17 18 #include <media/v4l2-common.h> 19 20 #include "uvcvideo.h" 21 22 static int uvc_mc_create_links(struct uvc_video_chain *chain, 23 struct uvc_entity *entity) 24 { 25 const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE; 26 struct media_entity *sink; 27 unsigned int i; 28 int ret; 29 30 sink = (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING) 31 ? (entity->vdev ? &entity->vdev->entity : NULL) 32 : &entity->subdev.entity; 33 if (sink == NULL) 34 return 0; 35 36 for (i = 0; i < entity->num_pads; ++i) { 37 struct media_entity *source; 38 struct uvc_entity *remote; 39 u8 remote_pad; 40 41 if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK)) 42 continue; 43 44 remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]); 45 if (remote == NULL) 46 return -EINVAL; 47 48 source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING) 49 ? (remote->vdev ? &remote->vdev->entity : NULL) 50 : &remote->subdev.entity; 51 if (source == NULL) 52 continue; 53 54 remote_pad = remote->num_pads - 1; 55 ret = media_create_pad_link(source, remote_pad, 56 sink, i, flags); 57 if (ret < 0) 58 return ret; 59 } 60 61 return 0; 62 } 63 64 static struct v4l2_subdev_ops uvc_subdev_ops = { 65 }; 66 67 void uvc_mc_cleanup_entity(struct uvc_entity *entity) 68 { 69 if (UVC_ENTITY_TYPE(entity) != UVC_TT_STREAMING) 70 media_entity_cleanup(&entity->subdev.entity); 71 else if (entity->vdev != NULL) 72 media_entity_cleanup(&entity->vdev->entity); 73 } 74 75 static int uvc_mc_init_entity(struct uvc_video_chain *chain, 76 struct uvc_entity *entity) 77 { 78 int ret; 79 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)); 84 85 ret = media_entity_pads_init(&entity->subdev.entity, 86 entity->num_pads, entity->pads); 87 88 if (ret < 0) 89 return ret; 90 91 ret = v4l2_device_register_subdev(&chain->dev->vdev, 92 &entity->subdev); 93 } else if (entity->vdev != NULL) { 94 ret = media_entity_pads_init(&entity->vdev->entity, 95 entity->num_pads, entity->pads); 96 if (entity->flags & UVC_ENTITY_FLAG_DEFAULT) 97 entity->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT; 98 } else 99 ret = 0; 100 101 return ret; 102 } 103 104 int uvc_mc_register_entities(struct uvc_video_chain *chain) 105 { 106 struct uvc_entity *entity; 107 int ret; 108 109 list_for_each_entry(entity, &chain->entities, chain) { 110 ret = uvc_mc_init_entity(chain, entity); 111 if (ret < 0) { 112 uvc_printk(KERN_INFO, "Failed to initialize entity for " 113 "entity %u\n", entity->id); 114 return ret; 115 } 116 } 117 118 list_for_each_entry(entity, &chain->entities, chain) { 119 ret = uvc_mc_create_links(chain, entity); 120 if (ret < 0) { 121 uvc_printk(KERN_INFO, "Failed to create links for " 122 "entity %u\n", entity->id); 123 return ret; 124 } 125 } 126 127 return 0; 128 } 129