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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 */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_device_configuration_select PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function selects a specific configuration for a device. */
/* When this configuration is set to the device, by default all the */
/* device interface and their associated alternate setting 0 is */
/* activated on the device. If the device/interface class driver */
/* wishes to change the setting of a particular interface, it needs */
/* to issue a select interface setting function. */
/* */
/* INPUT */
/* */
/* configuration Pointer to configuration */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_configuration_instance_create Create configuration */
/* instance */
/* _ux_host_stack_configuration_instance_delete Delete configuration */
/* instance */
/* _ux_host_stack_configuration_set Set configuration */
/* */
/* CALLED BY */
/* */
/* Application */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_device_configuration_select(UX_CONFIGURATION *configuration)
{
UX_DEVICE *device;
UX_CONFIGURATION *current_configuration;
UINT status;
/* Check for validity of the configuration handle. */
if (configuration -> ux_configuration_handle != (ULONG) (ALIGN_TYPE) configuration)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, 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, configuration, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
/* Get the device container for this configuration. */
device = configuration -> ux_configuration_device;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_DEVICE_CONFIGURATION_SELECT, device, configuration, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* We need to check the amount of power the bus powered device is consuming
before switch configuration. Otherwise we may run the risk of
an over current fault. */
if (((configuration -> ux_configuration_descriptor.bmAttributes & UX_CONFIGURATION_DEVICE_SELF_POWERED) == 0) &&
(configuration -> ux_configuration_descriptor.MaxPower > UX_DEVICE_MAX_POWER_GET(device)))
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_OVER_CURRENT_CONDITION);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_OVER_CURRENT_CONDITION, configuration, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_OVER_CURRENT_CONDITION);
}
/* Check for the state of the device . If the device is already configured,
we need to cancel the existing configuration before enabling this one. */
if (device -> ux_device_state == UX_DEVICE_CONFIGURED)
{
/* The device is configured. Get the first configuration pointer. */
current_configuration = device -> ux_device_current_configuration;
/* Deselect this instance */
_ux_host_stack_configuration_instance_delete(current_configuration);
}
/* The device can now be configured. */
status = _ux_host_stack_configuration_set(configuration);
if (status != UX_SUCCESS)
return(status);
/* Create the configuration instance. */
status = _ux_host_stack_configuration_instance_create(configuration);
/* Return completion status. */
return(status);
}
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