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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 */
/** */
/** CDC ECM Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_cdc_ecm.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_ecm_entry PORTABLE C */
/* 6.1.11 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the entry point of the cdc_ecm class. It will be */
/* called by the USBX stack enumeration module when there is a new */
/* cdc_ecm ethernet device on the bus or when the it is removed. */
/* */
/* */
/* INPUT */
/* */
/* command CDC ECM class command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_cdc_ecm_activate Activate cdc_ecm class */
/* _ux_host_class_cdc_ecm_deactivate Deactivate cdc_ecm class */
/* */
/* CALLED BY */
/* */
/* CDC ECM Class */
/* */
/**************************************************************************/
UINT _ux_host_class_cdc_ecm_entry(UX_HOST_CLASS_COMMAND *command)
{
#if defined(UX_HOST_STANDALONE)
UX_PARAMETER_NOT_USED(command);
return(UX_FUNCTION_NOT_SUPPORTED);
#else
UINT status;
/* The command request will tell us we need to do here, either a enumeration
query, an activation or a deactivation. */
switch (command -> ux_host_class_command_request)
{
case UX_HOST_CLASS_COMMAND_QUERY:
/* The query command is used to let the stack enumeration process know if we want to own
this device or not. */
if(command -> ux_host_class_command_usage == UX_HOST_CLASS_COMMAND_USAGE_CSP)
{
/* We are in CSP mode. Check if CDC-ECM Control or Data. */
if (((command -> ux_host_class_command_class == UX_HOST_CLASS_CDC_DATA_CLASS) && (command -> ux_host_class_command_subclass == 0)) ||
((command -> ux_host_class_command_class == UX_HOST_CLASS_CDC_CONTROL_CLASS) &&
(command -> ux_host_class_command_subclass == UX_HOST_CLASS_CDC_ECM_CONTROL_SUBCLASS)))
{
/* Check for IAD presence. */
if ((command -> ux_host_class_command_iad_class == 0) && (command -> ux_host_class_command_iad_subclass == 0))
/* No IAD, we accept this class. */
return(UX_SUCCESS);
else
{
if ((command -> ux_host_class_command_iad_class == UX_HOST_CLASS_CDC_CONTROL_CLASS) &&
(command -> ux_host_class_command_iad_subclass == UX_HOST_CLASS_CDC_ECM_CONTROL_SUBCLASS))
/* There is an IAD and this is for CDC-ACM. */
return(UX_SUCCESS);
else
/* The IAD does not match with CDC-ACM. */
return(UX_NO_CLASS_MATCH);
}
}
/* Not CDC-ECM control or data class. */
return(UX_NO_CLASS_MATCH);
}
else
/* No match. */
return(UX_NO_CLASS_MATCH);
case UX_HOST_CLASS_COMMAND_ACTIVATE:
/* The activate command is used when the device inserted has found a parent and
is ready to complete the enumeration. */
status = _ux_host_class_cdc_ecm_activate(command);
return(status);
case UX_HOST_CLASS_COMMAND_DEACTIVATE:
/* The deactivate command is used when the device has been extracted either
directly or when its parents has been extracted. */
status = _ux_host_class_cdc_ecm_deactivate(command);
return(status);
default:
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_FUNCTION_NOT_SUPPORTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_FUNCTION_NOT_SUPPORTED, 0, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_FUNCTION_NOT_SUPPORTED);
}
#endif
}
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