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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_endpoints_get PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function searches for the handle of the isochronous endpoints. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_interface_endpoint_get Get interface endpoint */
/* */
/* CALLED BY */
/* */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_endpoints_get(UX_HOST_CLASS_AUDIO *audio)
{
UINT status;
UINT endpoint_index;
UX_ENDPOINT *endpoint;
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
UX_TRANSFER *transfer;
ULONG packet_length;
#endif
/* Reset endpoints. */
audio -> ux_host_class_audio_isochronous_endpoint = UX_NULL;
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
audio -> ux_host_class_audio_feedback_endpoint = UX_NULL;
#endif
/* Search the ISO OUT endpoint. It is attached to the interface container. */
for (endpoint_index = 0; endpoint_index < audio -> ux_host_class_audio_streaming_interface -> ux_interface_descriptor.bNumEndpoints;
endpoint_index++)
{
/* Get interface endpoint. */
status = _ux_host_stack_interface_endpoint_get(audio -> ux_host_class_audio_streaming_interface, endpoint_index, &endpoint);
/* Check completion status. */
if (status == UX_SUCCESS)
{
/* Check if endpoint is ISO. */
if ((endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_ISOCHRONOUS_ENDPOINT)
{
/* Check endpoint direction. */
if ((endpoint -> ux_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_OUT)
{
/* We have found the ISO OUT endpoint. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_type = UX_REQUEST_OUT;
/* For OUTPUT, it's data endpoint, else feedback. */
if (audio -> ux_host_class_audio_type == UX_HOST_CLASS_AUDIO_OUTPUT)
audio -> ux_host_class_audio_isochronous_endpoint = endpoint;
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
else
audio -> ux_host_class_audio_feedback_endpoint = endpoint;
#endif
}
else
{
/* We have found the ISO IN endpoint. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_type = UX_REQUEST_IN;
/* For INPUT, it's data endpoint, else feedback. */
if (audio -> ux_host_class_audio_type == UX_HOST_CLASS_AUDIO_INPUT)
audio -> ux_host_class_audio_isochronous_endpoint = endpoint;
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
else
audio -> ux_host_class_audio_feedback_endpoint = endpoint;
#endif
}
}
}
}
/* The isochronous endpoint is mandatory. If we didn't find it, return an error. */
if (audio -> ux_host_class_audio_isochronous_endpoint == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_ENDPOINT_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_ENDPOINT_HANDLE_UNKNOWN, audio, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_ENDPOINT_HANDLE_UNKNOWN);
}
#if defined(UX_HOST_CLASS_AUDIO_FEEDBACK_SUPPORT)
/* With feedback, allocate buffer for packed feedback data. */
if (audio -> ux_host_class_audio_feedback_endpoint)
{
/* Get transfer. */
endpoint = audio -> ux_host_class_audio_feedback_endpoint;
transfer = &endpoint -> ux_endpoint_transfer_request;
/* Allocate buffer for feedback transfer (minimum 4 to fill both FS and HS). */
packet_length = transfer -> ux_transfer_request_packet_length;
if (packet_length < sizeof(audio -> ux_host_class_audio_feedback_buffer))
packet_length = sizeof(audio -> ux_host_class_audio_feedback_buffer);
transfer -> ux_transfer_request_data_pointer = _ux_utility_memory_allocate(
UX_NO_ALIGN, UX_CACHE_SAFE_MEMORY,
packet_length);
if (transfer -> ux_transfer_request_data_pointer == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_MEMORY_INSUFFICIENT, audio, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_MEMORY_INSUFFICIENT);
}
else
{
/* Sync previous feedback data. */
_ux_utility_memory_copy(transfer -> ux_transfer_request_data_pointer,
audio -> ux_host_class_audio_feedback_buffer,
sizeof(audio -> ux_host_class_audio_feedback_buffer)); /* Use case of memcpy is verified. */
}
/* Fill the transfer request with all the required fields. */
transfer -> ux_transfer_request_endpoint = audio -> ux_host_class_audio_feedback_endpoint;
transfer -> ux_transfer_request_requested_length = (endpoint -> ux_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) ?
transfer -> ux_transfer_request_packet_length :
((_ux_host_class_audio_speed_get(audio) == UX_HIGH_SPEED_DEVICE) ?
UX_FEEDBACK_SIZE_HIGH_SPEED : UX_FEEDBACK_SIZE_FULL_SPEED);
transfer -> ux_transfer_request_completion_function = _ux_host_class_audio_feedback_transfer_completed;
transfer -> ux_transfer_request_class_instance = audio;
/* Start feedback transfer in background. */
status = _ux_host_stack_transfer_request(transfer);
if (status != UX_SUCCESS)
return(status);
}
#endif
/* Return successful status. */
return(UX_SUCCESS);
}
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