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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_configure PORTABLE C */
/* 6.1.11 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function calls the USBX stack to do a SET_CONFIGURATION to */
/* the device. Once the device is configured, its interface(s) will */
/* be activated. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_configuration_interface_get Get interface */
/* _ux_host_stack_device_configuration_get Get configuration */
/* _ux_host_stack_device_configuration_select Select configuration */
/* */
/* CALLED BY */
/* */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_configure(UX_HOST_CLASS_AUDIO *audio)
{
UINT status;
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface;
ULONG interface_number;
#if UX_MAX_DEVICES > 1
UX_DEVICE *parent_device;
#endif
/* If the device has been configured already, we don't need to do it
again. */
if (audio -> ux_host_class_audio_device -> ux_device_state == UX_DEVICE_CONFIGURED)
return(UX_SUCCESS);
/* An audio device normally has one configuration. So retrieve the 1st configuration
only. */
status = _ux_host_stack_device_configuration_get(audio -> ux_host_class_audio_device, 0, &configuration);
if (status != UX_SUCCESS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CONFIGURATION_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_CONFIGURATION_HANDLE_UNKNOWN, audio -> ux_host_class_audio_device, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
#if UX_MAX_DEVICES > 1
/* Check the audio power source and check the parent power source for
incompatible connections. */
if (audio -> ux_host_class_audio_device -> ux_device_power_source == UX_DEVICE_BUS_POWERED)
{
/* Get parent device. */
parent_device = audio -> ux_host_class_audio_device -> ux_device_parent;
/* If the device is NULL, the parent is the root audio and we don't have to worry
if the parent is not the root audio, check for its power source. */
if ((parent_device != UX_NULL) && (parent_device -> ux_device_power_source == UX_DEVICE_BUS_POWERED))
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CONNECTION_INCOMPATIBLE);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_CONNECTION_INCOMPATIBLE, audio, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_CONNECTION_INCOMPATIBLE);
}
}
#endif
/* We have the valid configuration. Ask the USBX stack to set this configuration */
status = _ux_host_stack_device_configuration_select(configuration);
if (status != UX_SUCCESS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, status);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, status, audio -> ux_host_class_audio_device, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(status);
}
/* Start with interface number 0. */
interface_number = 0;
/* We only need to retrieve the audio streaming interface. */
do
{
/* Pickup interface. */
status = _ux_host_stack_configuration_interface_get(configuration, (UINT) interface_number, 0, &interface);
/* Check completion status. */
if (status == UX_SUCCESS)
{
/* Check the type of interface we have found - is it streaming? */
if (interface -> ux_interface_descriptor.bInterfaceSubClass == UX_HOST_CLASS_AUDIO_SUBCLASS_STREAMING)
{
audio -> ux_host_class_audio_streaming_interface = interface;
audio -> ux_host_class_audio_streaming_interface -> ux_interface_class_instance = (VOID *)audio;
break;
}
}
} while(status == UX_SUCCESS);
/* After we have parsed the audio interfaces, ensure the streaming interfaces is resent. */
if (audio -> ux_host_class_audio_streaming_interface == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_INTERFACE_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_INTERFACE_HANDLE_UNKNOWN, interface, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* We get here when we could not locate the interface(s) handle */
return(UX_INTERFACE_HANDLE_UNKNOWN);
}
else
{
return(UX_SUCCESS);
}
}
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