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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 */
/** */
/** Audio Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_audio.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_audio_entry PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the entry point of the Audio class. It will be */
/* called by the USBX stack enumeration module when there is a new */
/* audio device (speaker, microphone ...) on the bus or when the audio */
/* device is removed. */
/* */
/* INPUT */
/* */
/* command Pointer to command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_audio_activate Activate audio class */
/* _ux_host_class_audio_deactivate Deactivate audio class */
/* */
/* CALLED BY */
/* */
/* Host Stack */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_entry(UX_HOST_CLASS_COMMAND *command)
{
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) &&
(command -> ux_host_class_command_class == UX_HOST_CLASS_AUDIO_CLASS) &&
#if defined(UX_HOST_CLASS_AUDIO_2_SUPPORT)
((command -> ux_host_class_command_protocol == UX_HOST_CLASS_AUDIO_PROTOCOL_IP_VERSION_01_00) ||
(command -> ux_host_class_command_protocol == UX_HOST_CLASS_AUDIO_PROTOCOL_IP_VERSION_02_00))
#else
(command -> ux_host_class_command_protocol == UX_HOST_CLASS_AUDIO_PROTOCOL_IP_VERSION_01_00)
#endif
)
return(UX_SUCCESS);
else
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_audio_activate(command);
/* Return completion status. */
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_audio_deactivate(command);
/* Return completion status. */
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);
}
}
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