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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_control_value_get PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function obtains the dynamic feature values for a single audio */
/* control on either the master channel or a specific channel. */
/* */
/* Note only control value of BYTE, WORD and DWORD (<4) is supported. */
/* E.g., Graphic Equalizer Control is not supported. */
/* */
/* Note it's not recommended for supporting audio device with complex */
/* pinout scheme, where ux_host_class_audio_descriptors_parse can be */
/* used to build audio pinout scheme, and settings can be changed by */
/* ux_host_class_audio_control_request or ux_host_class_audio_feature */
/* functions. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* audio_control Pointer to audio control */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_class_instance_verify Verify instance is valid */
/* _ux_host_stack_transfer_request Process transfer request */
/* _ux_host_semaphore_get Get semaphore */
/* _ux_host_mutex_on Get mutex */
/* _ux_host_mutex_off Release mutex */
/* _ux_utility_memory_allocate Allocate memory block */
/* _ux_utility_memory_free Release memory block */
/* _ux_utility_short_get Read 16-bit value */
/* */
/* CALLED BY */
/* */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_control_value_get(UX_HOST_CLASS_AUDIO *audio, UX_HOST_CLASS_AUDIO_CONTROL *audio_control)
{
#if defined(UX_HOST_CLASS_AUDIO_DISABLE_CONTROLS)
UX_PARAMETER_NOT_USED(audio);
UX_PARAMETER_NOT_USED(audio_control);
return(UX_FUNCTION_NOT_SUPPORTED);
#else
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
UINT status;
UCHAR * control_buffer;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_AUDIO_CONTROL_VALUE_GET, audio, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* 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);
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &audio -> ux_host_class_audio_device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Need to allocate memory for the control_buffer. */
control_buffer = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, 4);
if (control_buffer == UX_NULL)
{
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Return error. */
return(UX_MEMORY_INSUFFICIENT);
}
/* Protect the control endpoint semaphore here. It will be unprotected in the
transfer request function. */
status = _ux_host_semaphore_get(&audio -> ux_host_class_audio_device -> ux_device_protection_semaphore, UX_WAIT_FOREVER);
/* Check for status. */
if (status != UX_SUCCESS)
{
/* Something went wrong. */
_ux_utility_memory_free(control_buffer);
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
return(status);
}
/* The buffer should be aligned. Returned data is little endian so DWord can be used
to copy any returned data of BYTE/WORD/DWORD. */
* (ULONG *)control_buffer = 0;
/* Create a transfer request for the GET_CUR_buffer request. */
transfer_request -> ux_transfer_request_data_pointer = control_buffer;
transfer_request -> ux_transfer_request_requested_length = 4;
#if defined(UX_HOST_CLASS_AUDIO_2_SUPPORT)
transfer_request -> ux_transfer_request_function = (_ux_host_class_audio_protocol_get(audio) == UX_HOST_CLASS_AUDIO_PROTOCOL_IP_VERSION_02_00) ?
UX_CLASS_AUDIO20_CUR :
UX_HOST_CLASS_AUDIO_GET_CUR;
#else
transfer_request -> ux_transfer_request_function = UX_HOST_CLASS_AUDIO_GET_CUR;
#endif
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_value = audio_control -> ux_host_class_audio_control_channel | (audio_control -> ux_host_class_audio_control << 8);
transfer_request -> ux_transfer_request_index = audio -> ux_host_class_audio_control_interface_number | (audio -> ux_host_class_audio_feature_unit_id << 8);
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check for correct transfer and entire control buffer returned. */
if (status == UX_SUCCESS)
{
/* Update the CUR static value for the caller. */
audio_control -> ux_host_class_audio_control_cur = _ux_utility_long_get(control_buffer);
}
/* Free all used resources. */
_ux_utility_memory_free(control_buffer);
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Return completion status. */
return(status);
#endif
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_audio_control_value_get PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in audio control value get function */
/* call. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* audio_control Pointer to audio control */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _uxe_host_class_audio_control_value_get */
/* Get audio control value */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_audio_control_value_get(UX_HOST_CLASS_AUDIO *audio, UX_HOST_CLASS_AUDIO_CONTROL *audio_control)
{
if ((audio == UX_NULL) || (audio_control == UX_NULL))
return(UX_INVALID_PARAMETER);
/* Invoke audio control get function. */
return(_ux_host_class_audio_control_value_get(audio, audio_control));
}
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