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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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/** Device Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define UX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "ux_api.h" |
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#include "ux_device_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_device_stack_interface_start 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 starts an interface associated with the enabled */ |
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/* configuration. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* interface Pointer to interface */ |
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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_slave_class_entry_function) Device class entry function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* Device Stack */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_device_stack_interface_start(UX_SLAVE_INTERFACE *interface_ptr) |
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{ |
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UX_SLAVE_DEVICE *device; |
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UX_SLAVE_CLASS *class_ptr; |
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UINT status; |
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UX_SLAVE_CLASS_COMMAND class_command; |
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/* Get the class for the interface. */ |
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class_ptr = _ux_system_slave -> ux_system_slave_interface_class_array[interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber]; |
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/* Check if class driver is available. */ |
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✓✓ |
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if (class_ptr == UX_NULL) |
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/* There is no class driver supported. */ |
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return (UX_NO_CLASS_MATCH); |
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/* Get the pointer to the device. */ |
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device = &_ux_system_slave -> ux_system_slave_device; |
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/* Build all the fields of the Class Command. */ |
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class_command.ux_slave_class_command_request = UX_SLAVE_CLASS_COMMAND_QUERY; |
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class_command.ux_slave_class_command_interface = (VOID *)interface_ptr; |
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class_command.ux_slave_class_command_class = interface_ptr -> ux_slave_interface_descriptor.bInterfaceClass; |
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class_command.ux_slave_class_command_subclass = interface_ptr -> ux_slave_interface_descriptor.bInterfaceSubClass; |
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class_command.ux_slave_class_command_protocol = interface_ptr -> ux_slave_interface_descriptor.bInterfaceProtocol; |
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class_command.ux_slave_class_command_vid = device -> ux_slave_device_descriptor.idVendor; |
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class_command.ux_slave_class_command_pid = device -> ux_slave_device_descriptor.idProduct; |
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/* We can now memorize the interface pointer associated with this class. */ |
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class_ptr -> ux_slave_class_interface = interface_ptr; |
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/* We have found a potential candidate. Call this registered class entry function. */ |
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status = class_ptr -> ux_slave_class_entry_function(&class_command); |
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/* The status tells us if the registered class wants to own this class. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* Store the class container. */ |
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class_command.ux_slave_class_command_class_ptr = class_ptr; |
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/* Store the command. */ |
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class_command.ux_slave_class_command_request = UX_SLAVE_CLASS_COMMAND_ACTIVATE; |
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/* Activate the class. */ |
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status = class_ptr -> ux_slave_class_entry_function(&class_command); |
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/* If the class was successfully activated, set the class for the interface. */ |
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✓✓ |
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if(status == UX_SUCCESS) |
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interface_ptr -> ux_slave_interface_class = class_ptr; |
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return(status); |
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} |
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/* There is no driver who want to own this class! */ |
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return(UX_NO_CLASS_MATCH); |
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} |
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