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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_stop PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function stops the audio streaming (select alt interface 0). */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_endpoint_transfer_abort */
/* Abort transfer */
/* _ux_host_stack_interface_setting_select */
/* Select interface */
/* _ux_host_mutex_on Get mutex */
/* _ux_host_mutex_off Release mutex */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_stop(UX_HOST_CLASS_AUDIO *audio)
{
UINT status;
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface_ptr;
UINT streaming_interface;
/* Ensure the instance is valid. */
if (_ux_host_stack_class_instance_verify(_ux_system_host_class_audio_name, (VOID *) audio) != UX_SUCCESS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, audio, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Protect thread reentry to this instance. */
_ux_host_mutex_on(&audio -> ux_host_class_audio_mutex);
/* Get the interface number of the audio streaming interface. */
streaming_interface = audio -> ux_host_class_audio_streaming_interface -> ux_interface_descriptor.bInterfaceNumber;
/* We need to abort transactions on the ISO pipes. */
if (audio -> ux_host_class_audio_isochronous_endpoint != UX_NULL)
{
/* Abort the iso transfer. */
_ux_host_stack_endpoint_transfer_abort(audio -> ux_host_class_audio_isochronous_endpoint);
}
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
if (audio -> ux_host_class_audio_feedback_endpoint)
_ux_host_stack_endpoint_transfer_abort(audio -> ux_host_class_audio_feedback_endpoint);
#endif
/* We found the alternate setting for the sampling values demanded, now we need
to search its container. */
configuration = audio -> ux_host_class_audio_streaming_interface -> ux_interface_configuration;
interface_ptr = configuration -> ux_configuration_first_interface;
/* Scan all interfaces. */
while (interface_ptr != UX_NULL)
{
/* We search for both the right interface and alternate setting. */
if ((interface_ptr -> ux_interface_descriptor.bInterfaceNumber == streaming_interface) &&
(interface_ptr -> ux_interface_descriptor.bAlternateSetting == 0))
{
/* We have found the right interface/alternate setting combination
The stack will select it for us. */
status = _ux_host_stack_interface_setting_select(interface_ptr);
/* If the alternate setting for the streaming interface could be selected, we memorize it. */
if (status == UX_SUCCESS)
{
/* Memorize the interface. */
audio -> ux_host_class_audio_streaming_interface = interface_ptr;
/* There is no endpoint for the alternate setting 0. */
_ux_host_stack_endpoint_transfer_abort(audio -> ux_host_class_audio_isochronous_endpoint);
audio -> ux_host_class_audio_isochronous_endpoint = UX_NULL;
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
if (audio -> ux_host_class_audio_feedback_endpoint)
{
_ux_host_stack_endpoint_transfer_abort(audio -> ux_host_class_audio_feedback_endpoint);
audio -> ux_host_class_audio_feedback_endpoint = UX_NULL;
}
#endif
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Return successful completion. */
return(UX_SUCCESS);
}
}
/* Move to next interface. */
interface_ptr = interface_ptr -> ux_interface_next_interface;
}
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Return failed completion status. */
return(UX_NO_ALTERNATE_SETTING);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_audio_stop PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in audio stop function call. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_audio_stop Hook a audio stop request */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_audio_stop(UX_HOST_CLASS_AUDIO *audio)
{
/* Sanity check. */
if (audio == UX_NULL)
return(UX_INVALID_PARAMETER);
/* Invoke audio stop function. */
return(_ux_host_class_audio_stop(audio));
}
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