/***************************************************************************
 * 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_configuration_instance_delete        PORTABLE C      */
/*                                                           6.2.0        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function will delete a configuration instance. It does not     */
/*    delete configuration container but it deletes all the alternate     */
/*    current alternate settings for each interface it owns.              */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    configuration                         Pointer to configuration      */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _ux_host_stack_interface_instance_delete  Delete interface instance */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    USBX Components                                                     */
/*                                                                        */
/**************************************************************************/
VOID  _ux_host_stack_configuration_instance_delete(UX_CONFIGURATION *configuration)
{

UX_INTERFACE    *interface_ptr;
ULONG           current_alternate_setting;

    /* If trace is enabled, insert this event into the trace buffer.  */
    UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_CONFIGURATION_INSTANCE_DELETE, configuration, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)

    /* Obtain the first interface for this configuration.  */
    interface_ptr =  configuration -> ux_configuration_first_interface;

    /* In order to keep the compiler happy, we reset the alternate setting.  */
    current_alternate_setting =  0;

    /* Each selected alternate setting for each interface must be deleted.  */
    while (interface_ptr != UX_NULL)
    {

        /* If this is the first alternate setting, the current alternate setting is maintained here.  */
        if (interface_ptr -> ux_interface_descriptor.bAlternateSetting == 0)
        {

            current_alternate_setting =  interface_ptr -> ux_interface_current_alternate_setting;
        }

        if (interface_ptr -> ux_interface_descriptor.bAlternateSetting == current_alternate_setting)
        {

#if UX_HOST_STACK_CONFIGURATION_INSTANCE_CREATE_CONTROL == UX_HOST_STACK_CONFIGURATION_INSTANCE_CREATE_OWNED

            /* If interface is usable, remove physical creates.  */
            if (interface_ptr -> ux_interface_class || configuration -> ux_configuration_device -> ux_device_class)
#endif
                _ux_host_stack_interface_instance_delete(interface_ptr);
        }

        interface_ptr =  interface_ptr -> ux_interface_next_interface;
    }

    return;
}

