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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 */
/** */
/** HUB Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hub.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hub_port_reset PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will reset a downstream port of the HUB. When the */
/* port is reset, the hardware logic of the HUB also enables it. */
/* */
/* INPUT */
/* */
/* hub Pointer to HUB class */
/* port Port number */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_hub_port_change_reset_process Reset HUB */
/* _ux_host_class_hub_feature Set HUB class feature */
/* _ux_host_class_hub_status_get Get HUB status */
/* _ux_utility_delay_ms Thread sleep */
/* */
/* CALLED BY */
/* */
/* HUB Class */
/* */
/**************************************************************************/
UINT _ux_host_class_hub_port_reset(UX_HOST_CLASS_HUB *hub, UINT port)
{
UINT status;
UINT port_enable_retry;
USHORT port_status;
USHORT port_change;
/* Send the PORT_RESET command. */
status = _ux_host_class_hub_feature(hub, port, UX_SET_FEATURE, UX_HOST_CLASS_HUB_PORT_RESET);
/* Check the function result and update HUB status if there was a problem. */
if (status != UX_SUCCESS)
return(status);
/* We allow retrying of this as we may not get the port enable status bit
set on the first try. */
port_enable_retry = UX_HOST_CLASS_HUB_ENABLE_RETRY_COUNT;
while (port_enable_retry--)
{
/* Now get the status until we have a port enabled. */
status = _ux_host_class_hub_status_get(hub, port, &port_status, &port_change);
if (status != UX_SUCCESS)
return(status);
/* On return of the GET_STATUS, the port_change field has been updated.
Check for each of the bits it may contain. */
if (port_change & UX_HOST_CLASS_HUB_PORT_CHANGE_RESET)
{
/* The port has been successfully reset. */
/* Clear the RESET change bit. */
_ux_host_class_hub_port_change_reset_process(hub, port, port_status);
/* Return success. */
return(UX_SUCCESS);
}
/* We should wait a bit before retrying this operation. */
_ux_utility_delay_ms(UX_HOST_CLASS_HUB_ENABLE_RETRY_DELAY);
}
/* We get here when the port never reported RESET completion. */
/* Invoke error callback. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_HUB, UX_PORT_RESET_FAILED);
/* Return error. */
return(UX_PORT_RESET_FAILED);
}
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