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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 */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_interface_set PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs a setting of an alternate setting for a */
/* specific interface. */
/* */
/* INPUT */
/* */
/* interface Pointer to interface */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_hcd_transfer_request HCD transfer request */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_interface_set(UX_INTERFACE *interface_ptr)
{
UX_DEVICE *device;
UX_CONFIGURATION *configuration;
UX_TRANSFER *transfer_request;
UINT status;
UX_ENDPOINT *control_endpoint;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_INTERFACE_SET, interface_ptr, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* Retrieve the pointer to the control endpoint and its transfer_request.
From the interface we go back to the configuration, then the device.
The device contains the default control endpoint container. */
configuration = interface_ptr -> ux_interface_configuration;
device = configuration -> ux_configuration_device;
control_endpoint = &device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Create a transfer_request for the SET_INTERFACE request. No data for this request */
transfer_request -> ux_transfer_request_requested_length = 0;
transfer_request -> ux_transfer_request_function = UX_SET_INTERFACE;
transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_index = (USHORT) interface_ptr -> ux_interface_descriptor.bInterfaceNumber;
transfer_request -> ux_transfer_request_value = (USHORT) interface_ptr -> ux_interface_descriptor.bAlternateSetting;
/* Send request. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Return status completion. */
return(status);
}
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