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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_ports_power 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 power up each downstream port attached to the */ |
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/* HUB. There is a delay after powering up each port, otherwise we may */ |
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/* not detect device insertion. */ |
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/* */ |
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/* There are 3 port power modes: */ |
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/* */ |
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/* 1) Gang power: In this case we only power the first */ |
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/* port and all ports should be powered at */ |
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/* the same time */ |
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/* */ |
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/* 2) Individual power: In this case we power individually each */ |
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/* port */ |
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/* */ |
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/* 3) No power switching: In this case the power is applied to the */ |
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/* downstream ports when the upstream port */ |
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/* receives power. */ |
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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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/* */ |
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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_feature Set HUB class feature */ |
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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_ports_power(UX_HOST_CLASS_HUB *hub) |
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{ |
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UINT nb_ports; |
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UINT port_index; |
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UINT status; |
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/* Check for the power management mode: no power switching. */ |
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✓✓ |
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if(hub -> ux_host_class_hub_descriptor.wHubCharacteristics & UX_HOST_CLASS_HUB_NO_POWER_SWITCHING) |
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return(UX_SUCCESS); |
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/* All ports must be powered individually. */ |
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nb_ports = hub -> ux_host_class_hub_descriptor.bNbPorts; |
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/* Perform the function to all ports: the port index starts from 1 as the port 0 is for the HUB. */ |
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✓✓ |
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for (port_index = 1; port_index <= nb_ports; port_index++) |
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{ |
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/* To apply port power, we send a SET_FEATURE to the port on the HUB. */ |
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status = _ux_host_class_hub_feature(hub, port_index, UX_SET_FEATURE, UX_HOST_CLASS_HUB_PORT_POWER); |
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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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{ |
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/* Set the HUB status to not powered. */ |
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hub -> ux_host_class_hub_port_power &= (UINT)~(1 << port_index); |
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} |
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else |
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{ |
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/* Now we need to wait for the power to be stable. */ |
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_ux_utility_delay_ms(((ULONG) (hub -> ux_host_class_hub_descriptor.bPwrOn2PwrGood) * 2)); |
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/* Set the HUB status to powered. */ |
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hub -> ux_host_class_hub_port_power |= (UINT)(1 << port_index); |
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} |
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} |
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/* Return successful completion. */ |
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return(UX_SUCCESS); |
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} |
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