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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 */
/** */
/** Device Stack */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_stack_alternate_setting_get PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function gets the alternate setting for a specific interface. */
/* */
/* INPUT */
/* */
/* endpoint Pointer to endpoint */
/* interface_value Interface value */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Application */
/* Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_stack_alternate_setting_get(ULONG interface_value)
{
UX_SLAVE_TRANSFER *transfer_request;
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UINT status;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_STACK_ALTERNATE_SETTING_GET, interface_value, 0, 0, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0)
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* If the device was in the configured state, there may be interfaces
attached to the configuration. */
if (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED)
{
/* Obtain the pointer to the first interface attached. */
interface_ptr = device -> ux_slave_device_first_interface;
#if !defined(UX_DEVICE_INITIALIZE_FRAMEWORK_SCAN_DISABLE) || UX_MAX_DEVICE_INTERFACES > 1
/* Start parsing each interface. */
while (interface_ptr != UX_NULL)
#else
if (interface_ptr != UX_NULL)
#endif
{
/* Check if this is the interface we have an inquiry for. */
if (interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber == interface_value)
{
/* Get the control endpoint of the device. */
endpoint = &device -> ux_slave_device_control_endpoint;
/* Get the pointer to the transfer request associated with the endpoint. */
transfer_request = &endpoint -> ux_slave_endpoint_transfer_request;
/* Set the value of the alternate setting in the buffer. */
*transfer_request -> ux_slave_transfer_request_data_pointer =
(UCHAR) interface_ptr -> ux_slave_interface_descriptor.bAlternateSetting;
/* Setup the length appropriately. */
transfer_request -> ux_slave_transfer_request_requested_length = 1;
/* Set the phase of the transfer to data out. */
transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_OUT;
/* Send the descriptor with the appropriate length to the host. */
status = _ux_device_stack_transfer_request(transfer_request, 1, 1);
/* Return the function status. */
return(status);
}
#if !defined(UX_DEVICE_INITIALIZE_FRAMEWORK_SCAN_DISABLE) || UX_MAX_DEVICE_INTERFACES > 1
/* Get the next interface. */
interface_ptr = interface_ptr -> ux_slave_interface_next_interface;
#endif
}
}
/* Return error completion. */
return(UX_ERROR);
}
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