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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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/** Host Stack */ |
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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_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_stack_configuration_interface_scan 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 will scan all default interfaces for a specific */ |
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/* configuration and call the registered class with the */ |
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/* Class/SubClass/Protocol of the interface. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* configuration Configuration pointer */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Result of operation */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_stack_class_call Call class command */ |
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/* _ux_host_stack_device_configuration_select */ |
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/* Select configuration */ |
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/* _ux_host_stack_class_call Call class from host stack */ |
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/* (ux_host_class_entry_function) Class entry function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_stack_configuration_interface_scan(UX_CONFIGURATION *configuration) |
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{ |
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UX_INTERFACE *interface_ptr; |
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UINT nb_class_owners; |
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UX_HOST_CLASS *class_ptr; |
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UX_HOST_CLASS_COMMAND class_command; |
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UINT status; |
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/* Initialize class owners to 0. */ |
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nb_class_owners = 0; |
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/* Get the first interface container for this configuration. */ |
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interface_ptr = configuration -> ux_configuration_first_interface; |
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/* We now scan all the alternate settings 0 for each of the interfaces. */ |
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✓✓ |
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while (interface_ptr != UX_NULL) |
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{ |
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/* Is there a default interface? */ |
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✓✓ |
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if(interface_ptr -> ux_interface_descriptor.bAlternateSetting == 0) |
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{ |
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/* We have a default interface for this configuration. Call each class |
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with the class\subclass\protocol. We include the IAD for the cdc classes. */ |
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class_command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_QUERY; |
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class_command.ux_host_class_command_container = (VOID *)interface_ptr; |
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class_command.ux_host_class_command_usage = UX_HOST_CLASS_COMMAND_USAGE_CSP; |
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class_command.ux_host_class_command_class = interface_ptr -> ux_interface_descriptor.bInterfaceClass; |
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class_command.ux_host_class_command_subclass = interface_ptr -> ux_interface_descriptor.bInterfaceSubClass; |
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class_command.ux_host_class_command_protocol = interface_ptr -> ux_interface_descriptor.bInterfaceProtocol; |
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class_command.ux_host_class_command_iad_class = interface_ptr -> ux_interface_iad_class ; |
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class_command.ux_host_class_command_iad_subclass = interface_ptr -> ux_interface_iad_subclass; |
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class_command.ux_host_class_command_iad_protocol = interface_ptr -> ux_interface_iad_protocol; |
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class_ptr = _ux_host_stack_class_call(&class_command); |
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/* On return, either we have found a class or the interface is still an orphan. */ |
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✓✓ |
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if (class_ptr != UX_NULL) |
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{ |
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/* There is a class. */ |
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nb_class_owners++; |
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interface_ptr -> ux_interface_class = class_ptr; |
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} |
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} |
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/* point to the next interface until end of the list. */ |
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interface_ptr = interface_ptr -> ux_interface_next_interface; |
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} |
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#if defined(UX_HOST_STANDALONE) |
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/* Activated later in state machine. */ |
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status = (nb_class_owners > 0) ? UX_SUCCESS : UX_NO_CLASS_MATCH; |
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return(status); |
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#else |
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/* Assume no classes. */ |
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status = UX_NO_CLASS_MATCH; |
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/* Check the number of class owner found. */ |
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✓✓ |
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if (nb_class_owners != 0) |
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{ |
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/* If we have found one or more classes for any of the interfaces, |
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we can safely do a SET_CONFIGURATION of the device. */ |
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status = _ux_host_stack_device_configuration_select(configuration); |
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/* Check the completion status. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* The device is in the CONFIGURED state, we have to call each of the classes |
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again with an ACTIVATE signal. */ |
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interface_ptr = configuration -> ux_configuration_first_interface; |
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✓✓ |
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while (interface_ptr != UX_NULL) |
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{ |
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/* Is there a default interface? */ |
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✓✓ |
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if (interface_ptr -> ux_interface_descriptor.bAlternateSetting == 0) |
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{ |
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/* We have found the default interface. If this interface is owned, |
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activate its class. */ |
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class_command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_ACTIVATE; |
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class_command.ux_host_class_command_container = (VOID *) interface_ptr; |
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✓✓ |
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if (interface_ptr -> ux_interface_class != UX_NULL) |
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{ |
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/* Save the class in the command container */ |
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class_command.ux_host_class_command_class_ptr = interface_ptr -> ux_interface_class; |
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/* Send the ACTIVATE command to the class */ |
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status = interface_ptr -> ux_interface_class -> ux_host_class_entry_function(&class_command); |
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} |
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} |
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/* Point to the next interface until end of the list. */ |
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interface_ptr = interface_ptr -> ux_interface_next_interface; |
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} |
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} |
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} |
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/* Return operation result. */ |
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return(status); |
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#endif |
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} |
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