/***************************************************************************
 * 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                                                        */
/**                                                                       */
/**   Device Stack                                                        */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define UX_SOURCE_CODE


/* Include necessary system files.  */

#include "ux_api.h"
#include "ux_device_stack.h"


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _ux_device_stack_interface_start                    PORTABLE C      */
/*                                                           6.1.12       */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function starts an interface associated with the enabled       */
/*    configuration.                                                      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    interface                             Pointer to interface          */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    (ux_slave_class_entry_function)       Device class entry function   */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*    Device Stack                                                        */
/*                                                                        */
/**************************************************************************/
UINT  _ux_device_stack_interface_start(UX_SLAVE_INTERFACE *interface_ptr)
{

UX_SLAVE_DEVICE             *device;
UX_SLAVE_CLASS              *class_ptr;
UINT                        status;
UX_SLAVE_CLASS_COMMAND      class_command;


    /* Get the class for the interface.  */
    class_ptr =  _ux_system_slave -> ux_system_slave_interface_class_array[interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber];

    /* Check if class driver is available. */
    if (class_ptr == UX_NULL)

        /* There is no class driver supported. */
        return (UX_NO_CLASS_MATCH);

    /* Get the pointer to the device.  */
    device =  &_ux_system_slave -> ux_system_slave_device;

    /* Build all the fields of the Class Command.  */
    class_command.ux_slave_class_command_request   =    UX_SLAVE_CLASS_COMMAND_QUERY;
    class_command.ux_slave_class_command_interface =   (VOID *)interface_ptr;
    class_command.ux_slave_class_command_class     =   interface_ptr -> ux_slave_interface_descriptor.bInterfaceClass;
    class_command.ux_slave_class_command_subclass  =   interface_ptr -> ux_slave_interface_descriptor.bInterfaceSubClass;
    class_command.ux_slave_class_command_protocol  =   interface_ptr -> ux_slave_interface_descriptor.bInterfaceProtocol;
    class_command.ux_slave_class_command_vid       =   device -> ux_slave_device_descriptor.idVendor;
    class_command.ux_slave_class_command_pid       =   device -> ux_slave_device_descriptor.idProduct;

    /* We can now memorize the interface pointer associated with this class.  */
    class_ptr -> ux_slave_class_interface = interface_ptr;

    /* We have found a potential candidate. Call this registered class entry function.  */
    status = class_ptr -> ux_slave_class_entry_function(&class_command);

    /* The status tells us if the registered class wants to own this class.  */
    if (status == UX_SUCCESS)
    {

        /* Store the class container. */
        class_command.ux_slave_class_command_class_ptr =  class_ptr;

        /* Store the command.  */
        class_command.ux_slave_class_command_request =  UX_SLAVE_CLASS_COMMAND_ACTIVATE;

        /* Activate the class.  */
        status = class_ptr -> ux_slave_class_entry_function(&class_command);

        /* If the class was successfully activated, set the class for the interface.  */
        if(status == UX_SUCCESS)
            interface_ptr -> ux_slave_interface_class =  class_ptr;

        return(status);
    }

    /* There is no driver who want to own this class!  */
    return(UX_NO_CLASS_MATCH);
}

