/***************************************************************************
 * 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);
}

