1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/media/video/uvc/uvc_entity.c b/drivers/media/video/uvc/uvc_entity.c
new file mode 100644
index 00000000000..8e8e7efb460
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_entity.c
@@ -0,0 +1,94 @@
+/*
+ *      uvc_entity.c  --  USB Video Class driver
+ *
+ *      Copyright (C) 2005-2011
+ *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-common.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * Video subdevices registration and unregistration
+ */
+
+static int uvc_mc_register_entity(struct uvc_video_chain *chain,
+	struct uvc_entity *entity)
+{
+	const u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
+	struct uvc_entity *remote;
+	unsigned int i;
+	u8 remote_pad;
+	int ret;
+
+	for (i = 0; i < entity->num_pads; ++i) {
+		if (!(entity->pads[i].flags & MEDIA_PAD_FL_SINK))
+			continue;
+
+		remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
+		if (remote == NULL)
+			return -EINVAL;
+
+		remote_pad = remote->num_pads - 1;
+		ret = media_entity_create_link(&remote->subdev.entity,
+				remote_pad, &entity->subdev.entity, i, flags);
+		if (ret < 0)
+			return ret;
+	}
+
+	return v4l2_device_register_subdev(&chain->dev->vdev, &entity->subdev);
+}
+
+static struct v4l2_subdev_ops uvc_subdev_ops = {
+};
+
+void uvc_mc_cleanup_entity(struct uvc_entity *entity)
+{
+	media_entity_cleanup(&entity->subdev.entity);
+}
+
+static int uvc_mc_init_entity(struct uvc_entity *entity)
+{
+	v4l2_subdev_init(&entity->subdev, &uvc_subdev_ops);
+	strlcpy(entity->subdev.name, entity->name, sizeof(entity->subdev.name));
+
+	return media_entity_init(&entity->subdev.entity, entity->num_pads,
+				 entity->pads, 0);
+}
+
+int uvc_mc_register_entities(struct uvc_video_chain *chain)
+{
+	struct uvc_entity *entity;
+	int ret;
+
+	list_for_each_entry(entity, &chain->entities, chain) {
+		ret = uvc_mc_init_entity(entity);
+		if (ret < 0) {
+			uvc_printk(KERN_INFO, "Failed to initialize entity for "
+				   "entity %u\n", entity->id);
+			return ret;
+		}
+	}
+
+	list_for_each_entry(entity, &chain->entities, chain) {
+		ret = uvc_mc_register_entity(chain, entity);
+		if (ret < 0) {
+			uvc_printk(KERN_INFO, "Failed to register entity for "
+				   "entity %u\n", entity->id);
+			return ret;
+		}
+	}
+
+	return 0;
+}