media: videobuf2-v4l2: add vb2_request_queue/validate helpers

}

EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);

/*

 * Note that this function is called during validation time and

 * thus the req_queue_mutex is held to ensure no request objects

 * can be added or deleted while validating. So there is no need

 * to protect the objects list.

 */

int vb2_request_validate(struct media_request *req)

{

	struct media_request_object *obj;

	int ret = 0;

	if (!vb2_request_has_buffers(req))

		return -ENOENT;

	list_for_each_entry(obj, &req->objects, list) {

		if (!obj->ops->prepare)

			continue;

		ret = obj->ops->prepare(obj);

		if (ret)

			break;

	}

	if (ret) {

		list_for_each_entry_continue_reverse(obj, &req->objects, list)

			if (obj->ops->unprepare)

				obj->ops->unprepare(obj);

		return ret;

	}

	return 0;

}

EXPORT_SYMBOL_GPL(vb2_request_validate);

void vb2_request_queue(struct media_request *req)

{

	struct media_request_object *obj, *obj_safe;

	/*

	 * Queue all objects. Note that buffer objects are at the end of the

	 * objects list, after all other object types. Once buffer objects

	 * are queued, the driver might delete them immediately (if the driver

	 * processes the buffer at once), so we have to use

	 * list_for_each_entry_safe() to handle the case where the object we

	 * queue is deleted.

	 */

	list_for_each_entry_safe(obj, obj_safe, &req->objects, list)

		if (obj->ops->queue)

			obj->ops->queue(obj);

}

EXPORT_SYMBOL_GPL(vb2_request_queue);

MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");

MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");

MODULE_LICENSE("GPL");

 */

void vb2_ops_wait_finish(struct vb2_queue *vq);

struct media_request;

int vb2_request_validate(struct media_request *req);

void vb2_request_queue(struct media_request *req);

#endif /* _MEDIA_VIDEOBUF2_V4L2_H */