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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_change_detect PORTABLE C */ |
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/* 6.1.12 */ |
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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 is called by the enumeration thread when there has */ |
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/* been activity on the HUB. */ |
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/* */ |
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/* In standalone mode there is nothing to do here, activities are */ |
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/* processed in hub tasks function. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_class_hub_change_process Process HUB change */ |
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/* _ux_host_stack_class_get Get class */ |
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/* _ux_host_stack_class_instance_get Get class instance */ |
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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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VOID _ux_host_class_hub_change_detect(VOID) |
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{ |
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#if defined(UX_HOST_STANDALONE) |
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/* Things are done in hub task nothing to do here. */ |
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#else |
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UX_HOST_CLASS *class; |
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UX_HOST_CLASS_HUB *hub; |
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UINT status; |
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UINT class_index; |
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/* Get the class container first. */ |
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_ux_host_stack_class_get(_ux_system_host_class_hub_name, &class); |
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/* We start with the first index of the class instance. */ |
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class_index = 0; |
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/* We have found the class, now parse the instances. */ |
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do |
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{ |
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/* Get class instance. */ |
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status = _ux_host_stack_class_instance_get(class, class_index++, (VOID **) &hub); |
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/* Check completion status. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* We have found an instance of a HUB, check if it is live and if the HUB has |
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detected a change before we proceed. */ |
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✓✓ |
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if (hub -> ux_host_class_hub_change_semaphore != 0) |
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{ |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_HUB_CHANGE_DETECT, hub, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0) |
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/* Call the HUB function that will diagnose the origin of the change. */ |
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_ux_host_class_hub_change_process(hub); |
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/* Decrement the HUB instance semaphore change so we don't get awaken again. */ |
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hub -> ux_host_class_hub_change_semaphore--; |
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} |
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} |
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✓✓ |
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} while (status == UX_SUCCESS); |
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/* We have parsed all the HUB instances. */ |
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return; |
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#endif |
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} |