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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** HUB Class */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_class_hub.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_class_hub_port_reset PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function will reset a downstream port of the HUB. When the */ |
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/* port is reset, the hardware logic of the HUB also enables it. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* hub Pointer to HUB class */ |
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/* port Port number */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_class_hub_port_change_reset_process Reset HUB */ |
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/* _ux_host_class_hub_feature Set HUB class feature */ |
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/* _ux_host_class_hub_status_get Get HUB status */ |
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/* _ux_utility_delay_ms Thread sleep */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* HUB Class */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_class_hub_port_reset(UX_HOST_CLASS_HUB *hub, UINT port) |
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{ |
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UINT status; |
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UINT port_enable_retry; |
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USHORT port_status; |
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USHORT port_change; |
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/* Send the PORT_RESET command. */ |
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status = _ux_host_class_hub_feature(hub, port, UX_SET_FEATURE, UX_HOST_CLASS_HUB_PORT_RESET); |
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/* Check the function result and update HUB status if there was a problem. */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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return(status); |
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/* We allow retrying of this as we may not get the port enable status bit |
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set on the first try. */ |
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port_enable_retry = UX_HOST_CLASS_HUB_ENABLE_RETRY_COUNT; |
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✓✓ |
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while (port_enable_retry--) |
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{ |
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/* Now get the status until we have a port enabled. */ |
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status = _ux_host_class_hub_status_get(hub, port, &port_status, &port_change); |
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✓✓ |
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if (status != UX_SUCCESS) |
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return(status); |
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/* On return of the GET_STATUS, the port_change field has been updated. |
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Check for each of the bits it may contain. */ |
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✓✓ |
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if (port_change & UX_HOST_CLASS_HUB_PORT_CHANGE_RESET) |
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{ |
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/* The port has been successfully reset. */ |
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/* Clear the RESET change bit. */ |
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_ux_host_class_hub_port_change_reset_process(hub, port, port_status); |
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/* Return success. */ |
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return(UX_SUCCESS); |
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} |
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/* We should wait a bit before retrying this operation. */ |
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_ux_utility_delay_ms(UX_HOST_CLASS_HUB_ENABLE_RETRY_DELAY); |
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} |
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/* We get here when the port never reported RESET completion. */ |
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/* Invoke error callback. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_HUB, UX_PORT_RESET_FAILED); |
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/* Return error. */ |
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return(UX_PORT_RESET_FAILED); |
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} |
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