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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Video Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_video.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_video_transfer_request PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function submits an isochronous video transfer request or */
/* isochronous video transfer request list to the USBX stack. */
/* */
/* Note if the transfer request is not linked (next pointer is NULL), */
/* a single request is submitted. If the transfer request links into a */
/* list, the whole list is submitted. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* video_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_transfer_request(UX_HOST_CLASS_VIDEO *video,
UX_HOST_CLASS_VIDEO_TRANSFER_REQUEST *video_transfer_request)
{
UINT status;
UX_ENDPOINT *endpoint;
UX_TRANSFER *transfer_list;
UX_TRANSFER *transfer_request;
UX_TRANSFER *previous_transfer;
/* Get transfer request list head. */
transfer_list = &video_transfer_request -> ux_host_class_video_transfer_request;
/* Get endpoint. */
endpoint = video -> ux_host_class_video_isochronous_endpoint;
/* Process the transfer request list (if multiple found). */
previous_transfer = UX_NULL;
while(video_transfer_request)
{
/* The transfer request is embedded in the application transfer request. */
transfer_request = &video_transfer_request -> ux_host_class_video_transfer_request;
/* Select the direction. We do this by taking the endpoint direction. */
transfer_request -> ux_transfer_request_type = video -> ux_host_class_video_isochronous_endpoint ->
ux_endpoint_descriptor.bEndpointAddress & UX_REQUEST_DIRECTION;
/* Fill the transfer request with all the required fields. */
transfer_request -> ux_transfer_request_endpoint = endpoint;
transfer_request -> ux_transfer_request_data_pointer = video_transfer_request -> ux_host_class_video_transfer_request_data_pointer;
transfer_request -> ux_transfer_request_requested_length = video_transfer_request -> ux_host_class_video_transfer_request_requested_length;
transfer_request -> ux_transfer_request_completion_function = _ux_host_class_video_transfer_request_completed;
transfer_request -> ux_transfer_request_class_instance = video;
/* We memorize the application transfer request in the local transfer request. */
transfer_request -> ux_transfer_request_user_specific = (VOID *) video_transfer_request;
/* Confirm transfer is not linking to others */
transfer_request -> ux_transfer_request_next_transfer_request = UX_NULL;
/* Add it to transfer list tail. */
if (previous_transfer != UX_NULL)
previous_transfer -> ux_transfer_request_next_transfer_request = transfer_request;
/* Save as previous transfer. */
previous_transfer = transfer_request;
/* Check next transfer request. */
video_transfer_request = video_transfer_request -> ux_host_class_video_transfer_request_next_video_transfer_request;
}
/* Set endpoint status to pending, for callback and abort to check. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_completion_code = UX_TRANSFER_STATUS_PENDING;
/* Transfer the transfer request (list). */
status = _ux_host_stack_transfer_request(transfer_list);
/* Return completion status. */
return(status);
}
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