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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_descriptor_get PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function obtains the entire audio configuration descriptors. */
/* This is needed because the audio class has many class specific */
/* descriptors which describe the alternate settings that can be used. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* _ux_utility_descriptor_parse Parse descriptor */
/* _ux_utility_memory_allocate Allocate memory block */
/* _ux_utility_memory_free Release memory block */
/* */
/* CALLED BY */
/* */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_descriptor_get(UX_HOST_CLASS_AUDIO *audio)
{
UX_DEVICE *device;
UX_CONFIGURATION *configuration;
UCHAR * descriptor;
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
UINT status;
ULONG total_configuration_length;
/* Get device, current configuration. */
device = audio -> ux_host_class_audio_device;
configuration = device -> ux_device_current_configuration;
/* Check if descriptor is previously saved. */
if (device -> ux_device_packed_configuration != UX_NULL)
{
audio -> ux_host_class_audio_configuration_descriptor =
device -> ux_device_packed_configuration;
audio -> ux_host_class_audio_configuration_descriptor_length =
configuration -> ux_configuration_descriptor.wTotalLength;
/* Descriptor must be kept after enum. */
device -> ux_device_packed_configuration_keep_count ++;
return(UX_SUCCESS);
}
/* Get total length of configuration descriptors. */
total_configuration_length = configuration -> ux_configuration_descriptor.wTotalLength;
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Need to allocate memory for the descriptor. */
descriptor = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, total_configuration_length);
if (descriptor == UX_NULL)
return(UX_MEMORY_INSUFFICIENT);
/* Create a transfer request for the GET_DESCRIPTOR request. */
transfer_request -> ux_transfer_request_data_pointer = descriptor;
transfer_request -> ux_transfer_request_requested_length = total_configuration_length;
transfer_request -> ux_transfer_request_function = UX_GET_DESCRIPTOR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_DEVICE;
transfer_request -> ux_transfer_request_value = UX_CONFIGURATION_DESCRIPTOR_ITEM << 8;
transfer_request -> ux_transfer_request_index = 0;
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check for correct transfer and entire descriptor returned. */
if ((status == UX_SUCCESS) && (transfer_request -> ux_transfer_request_actual_length == total_configuration_length))
{
/* Save the address of the entire configuration descriptor of the audio device. */
audio -> ux_host_class_audio_configuration_descriptor = descriptor;
/* Save the length of the entire descriptor too. */
audio -> ux_host_class_audio_configuration_descriptor_length = total_configuration_length;
/* Keep descriptor to be shared for this device. */
device -> ux_device_packed_configuration = descriptor;
device -> ux_device_packed_configuration_keep_count ++;
/* We do not free the resource for the descriptor until the device is
plugged out. */
return(UX_SUCCESS);
}
/* Free all used resources. */
_ux_utility_memory_free(descriptor);
/* Return completion status. */
return(status);
}
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