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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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#if UX_MAX_DEVICES > 1 |
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#if defined(UX_HOST_STANDALONE) |
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UINT _ux_host_class_hub_descriptor_parse(UX_HOST_CLASS_HUB *hub, UCHAR *descriptor); |
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UINT |
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#else |
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static inline UINT |
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#endif |
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_ux_host_class_hub_descriptor_parse(UX_HOST_CLASS_HUB *hub, UCHAR *descriptor) |
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{ |
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UINT status = UX_SUCCESS; |
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ULONG tt_protocols; /* (bDeviceProtocol << 8) | bInterfaceProtocol */ |
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ULONG port_index; |
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/* Parse the device descriptor and create the local descriptor. */ |
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_ux_utility_descriptor_parse(descriptor, _ux_system_hub_descriptor_structure, UX_HUB_DESCRIPTOR_ENTRIES, |
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(UCHAR *) &hub -> ux_host_class_hub_descriptor); |
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/* Check the protocol used by the HUB. This will indicate if the HUB supports multiple TTs in high speed mode. */ |
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tt_protocols = ((ULONG)hub -> ux_host_class_hub_device -> ux_device_descriptor.bDeviceProtocol << 8) | |
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hub -> ux_host_class_hub_interface -> ux_interface_descriptor.bInterfaceProtocol; |
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✓✓✓✓
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switch(tt_protocols) |
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{ |
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/* 1. A hub operating at full-/low-speed has a device descriptor with a bDeviceProtocol field set to zero(0) |
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* and an interface descriptor with a bInterfaceProtocol field set to zero(0). |
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*/ |
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case (UX_HOST_CLASS_HUB_PROTOCOL_FS << 8): |
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/* In the case of full speed hub, there are no TTs to declare */ |
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break; |
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/* 2. A hub that has a single TT must set the bDeviceProtocol field of the device descriptor to one(1) and |
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* the interface descriptor bInterfaceProtocol field set to 0. |
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* 3. A multiple TT hub must set the bDeviceProtocol field of the device descriptor to two (2). |
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* The first interface descriptor has the bInterfaceProtocol field set to one(1). |
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*/ |
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case (UX_HOST_CLASS_HUB_PROTOCOL_SINGLE_TT << 8): /* Fall through. */ |
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case (UX_HOST_CLASS_HUB_PROTOCOL_MULTIPLE_TT << 8) | UX_HOST_CLASS_HUB_PROTOCOL_SINGLE_TT: |
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/* Single TT hub or single TT interface. */ |
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/* Check if current setting supports this Hub. */ |
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✓✓ |
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if (hub -> ux_host_class_hub_descriptor.bNbPorts > UX_MAX_TT) |
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{ |
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status = UX_TOO_MANY_HUB_PORTS; |
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break; |
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} |
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/* In a single TT state, all the downstream ports report to the same |
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TT and share the 1.1 USB segment bandwidth. This is a very crude |
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but working method, we simply set all the ports bits to the first |
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TT. */ |
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hub -> ux_host_class_hub_device -> ux_device_hub_tt[0].ux_hub_tt_port_mapping = UX_TT_MASK; |
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hub -> ux_host_class_hub_device -> ux_device_hub_tt[0].ux_hub_tt_max_bandwidth = UX_TT_BANDWIDTH; |
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break; |
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/* 3. A multiple TT hub must set the bDeviceProtocol field of the device descriptor to two (2). |
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* The first interface descriptor has the bInterfaceProtocol field set to one(1). |
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* Such a hub also has a second interface descriptor where the bInterfaceProtocol is set to two(2). |
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*/ |
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case (UX_HOST_CLASS_HUB_PROTOCOL_MULTIPLE_TT << 8) | UX_HOST_CLASS_HUB_PROTOCOL_MULTIPLE_TT: |
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/* Multiple TTs. */ |
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/* Check if current setting supports this Hub. */ |
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✓✓ |
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if (hub -> ux_host_class_hub_descriptor.bNbPorts > UX_MAX_TT) |
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{ |
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status = UX_TOO_MANY_HUB_PORTS; |
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break; |
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} |
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/* In the case of multiple TTs, each downstream port can sustain the USB 1.1 |
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max bandwidth and therefore we allocate one TT per port with that bandwidth. */ |
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✓✓ |
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for (port_index = 0; port_index < hub -> ux_host_class_hub_descriptor.bNbPorts; port_index++) |
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{ |
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hub -> ux_host_class_hub_device -> ux_device_hub_tt[port_index].ux_hub_tt_port_mapping = (ULONG)(1 << port_index); |
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hub -> ux_host_class_hub_device -> ux_device_hub_tt[port_index].ux_hub_tt_max_bandwidth = UX_TT_BANDWIDTH; |
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} |
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break; |
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default: /* Invalid bDeviceProtocol and bInterfaceProtocol pair. */ |
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/* We should never get here. In this case the protocol value of the HUB is illegal. */ |
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status = UX_DESCRIPTOR_CORRUPTED; |
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} |
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/* Return status. */ |
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return(status); |
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} |
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#endif |
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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_descriptor_get PORTABLE C */ |
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/* 6.3.0 */ |
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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 obtains the HUB descriptor. This descriptor contains */ |
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/* the number of downstream ports and the power characteristics of the */ |
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/* HUB (self powered or bus powered). */ |
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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_stack_transfer_request Process transfer request */ |
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/* _ux_utility_memory_allocate Allocate memory block */ |
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/* _ux_utility_memory_free Release memory block */ |
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/* _ux_utility_descriptor_parse Parse descriptor */ |
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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_descriptor_get(UX_HOST_CLASS_HUB *hub) |
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{ |
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UCHAR *descriptor; |
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UX_ENDPOINT *control_endpoint; |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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/* We need to get the default control endpoint transfer request pointer. */ |
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control_endpoint = &hub -> ux_host_class_hub_device -> ux_device_control_endpoint; |
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transfer_request = &control_endpoint -> ux_endpoint_transfer_request; |
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/* Need to allocate memory for the descriptor. */ |
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descriptor = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, UX_HUB_DESCRIPTOR_LENGTH); |
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✓✓ |
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if (descriptor == UX_NULL) |
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return(UX_MEMORY_INSUFFICIENT); |
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/* Create a transfer request for the GET_DESCRIPTOR request. */ |
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transfer_request -> ux_transfer_request_data_pointer = descriptor; |
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transfer_request -> ux_transfer_request_requested_length = UX_HUB_DESCRIPTOR_LENGTH; |
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transfer_request -> ux_transfer_request_function = UX_HOST_CLASS_HUB_GET_DESCRIPTOR; |
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transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_DEVICE; |
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transfer_request -> ux_transfer_request_value = (UX_HUB_DESCRIPTOR_ITEM << 8); |
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transfer_request -> ux_transfer_request_index = 0; |
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#if defined(UX_HOST_STANDALONE) |
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/* Save allocated buffer pointer. */ |
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hub -> ux_host_class_hub_allocated = descriptor; |
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/* Link to running transfer. */ |
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UX_TRANSFER_STATE_RESET(transfer_request); |
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hub -> ux_host_class_hub_transfer = transfer_request; |
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status = UX_SUCCESS; |
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#else |
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/* Send request to HCD layer. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Did the transfer succeed? */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* Is the length valid? */ |
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✓✓ |
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if (transfer_request -> ux_transfer_request_actual_length == UX_HUB_DESCRIPTOR_LENGTH) |
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{ |
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#if UX_MAX_DEVICES > 1 |
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status = _ux_host_class_hub_descriptor_parse(hub, descriptor); |
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✓✓ |
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if (status != UX_SUCCESS) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_HUB, status); |
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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_ERROR, status, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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} |
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#endif |
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} |
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else |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_HUB, UX_DESCRIPTOR_CORRUPTED); |
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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_ERROR, UX_DESCRIPTOR_CORRUPTED, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* The descriptor must be corrupted if we got an invalid length. */ |
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status = UX_DESCRIPTOR_CORRUPTED; |
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} |
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} |
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/* Free the memory for the descriptor. */ |
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_ux_utility_memory_free(descriptor); |
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#endif |
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/* Return completion status. */ |
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return(status); |
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} |