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