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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_interrupt_start PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function starts audio control (AC) interface interrupt */
/* message polling. */
/* */
/* Note it should be called after audio control instance is activated */
/* and should be called only once before the instance is deactivated. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio control (AC) */
/* instance */
/* callback_function Callback function invoked on */
/* interrupt message reception */
/* arg Callback argument passed to */
/* callback function */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_class_instance_verify Verify instance is valid */
/* _ux_host_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_interrupt_start(UX_HOST_CLASS_AUDIO_AC *audio,
VOID(*callback_function)(UX_HOST_CLASS_AUDIO_AC *audio,
UCHAR *message, ULONG length,
VOID *arg),
VOID *arg)
{
#if !defined(UX_HOST_CLASS_AUDIO_INTERRUPT_SUPPORT)
UX_PARAMETER_NOT_USED(audio);
UX_PARAMETER_NOT_USED(callback_function);
UX_PARAMETER_NOT_USED(arg);
return(UX_FUNCTION_NOT_SUPPORTED);
#else
UX_ENDPOINT *endpoint;
UX_TRANSFER *transfer;
UINT status;
/* 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);
}
/* Ensure endpoint is valid. */
endpoint = audio -> ux_host_class_audio_interrupt_endpoint;
if (endpoint == UX_NULL)
return(UX_FUNCTION_NOT_SUPPORTED);
/* Check if interrupt started. */
if (audio -> ux_host_class_audio_interrupt_started)
return(UX_ALREADY_ACTIVATED);
/* Set application callback and its argument. */
audio -> ux_host_class_audio_interrupt_callback_arg = arg;
audio -> ux_host_class_audio_interrupt_callback = callback_function;
/* Get the transfer request. */
transfer = &endpoint -> ux_endpoint_transfer_request;
/* Save class instance to issue this transfer. */
transfer -> ux_transfer_request_class_instance = (VOID *)audio;
/* Save transfer complete callback. */
transfer -> ux_transfer_request_completion_function = _ux_host_class_audio_interrupt_notification;
/* The transfer on the interrupt endpoint can be started. */
status = _ux_host_stack_transfer_request(transfer);
if (status == UX_SUCCESS)
audio -> ux_host_class_audio_interrupt_started = UX_TRUE;
/* Return completion status. */
return(status);
#endif
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_audio_interrupt_start PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in audio interrupt start function call. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio control (AC) */
/* instance */
/* callback_function Callback function invoked on */
/* interrupt message reception */
/* arg Callback argument passed to */
/* callback function */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _uxe_host_class_audio_interrupt_start Start audio interrupt polling */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_audio_interrupt_start(UX_HOST_CLASS_AUDIO_AC *audio,
VOID(*callback_function)(UX_HOST_CLASS_AUDIO_AC *audio,
UCHAR *message, ULONG length,
VOID *arg),
VOID *arg)
{
/* Sanity checks. */
if (audio == UX_NULL)
return(UX_INVALID_PARAMETER);
/* Invoke interrupt start function. */
return(_ux_host_class_audio_interrupt_start(audio, callback_function, arg));
}
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