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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_process 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 is called by the topology thread when there has been */ |
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/* activity on the HUB. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* hub Pointer to HUB */ |
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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_process Port change process */ |
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/* _ux_host_stack_transfer_request Process transfer request */ |
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/* _ux_utility_short_get Get 16-bit word */ |
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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_change_process(UX_HOST_CLASS_HUB *hub) |
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{ |
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UX_TRANSFER *transfer_request; |
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USHORT port_status_change_bits; |
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UINT port_index; |
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UINT status; |
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/* Now get the transfer_request attached to the interrupt endpoint. */ |
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transfer_request = &hub -> ux_host_class_hub_interrupt_endpoint -> ux_endpoint_transfer_request; |
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/* The interrupt pipe buffer contains the status change for each of the ports |
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the length of the buffer can be 1 or 2 depending on the number of ports. |
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Usually, since HUBs can be bus powered the maximum number of ports is 4. |
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We must be taking precautions on how we read the buffer content for |
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big endian machines. */ |
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✓✓ |
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if (transfer_request -> ux_transfer_request_actual_length == 1) |
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port_status_change_bits = (USHORT) *transfer_request -> ux_transfer_request_data_pointer; |
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else |
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port_status_change_bits = (USHORT)_ux_utility_short_get(transfer_request -> ux_transfer_request_data_pointer); |
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/* Scan all bits and report the change on each port. */ |
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✓✓ |
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for (port_index = 1; port_index <= hub -> ux_host_class_hub_descriptor.bNbPorts; port_index++) |
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{ |
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✓✓ |
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if (port_status_change_bits & (1<<port_index)) |
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_ux_host_class_hub_port_change_process(hub, port_index); |
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} |
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/* The HUB could also have changed. */ |
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✓✓ |
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if (port_status_change_bits & 1) |
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_ux_host_class_hub_hub_change_process(hub); |
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/* The actual length should be cleared for the next transfer. */ |
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transfer_request -> ux_transfer_request_actual_length = 0; |
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/* Resend the request to the stack. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Return completion status. */ |
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return(status); |
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} |