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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_class_call 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 call all the registered classes to the USBX */ |
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/* stack. Each class will have the possibility to own the device or */ |
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/* one of the interfaces of a device. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* class_command Class command structure */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Number of owners */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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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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UX_HOST_CLASS *_ux_host_stack_class_call(UX_HOST_CLASS_COMMAND *class_command) |
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{ |
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UINT status = UX_NO_CLASS_MATCH; |
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UX_HOST_CLASS *class_inst; |
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#if UX_MAX_CLASS_DRIVER > 1 |
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ULONG class_index; |
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#endif |
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/* Start from the 1st registered classes with USBX. */ |
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class_inst = _ux_system_host -> ux_system_host_class_array; |
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/* Parse all the class drivers. */ |
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#if UX_MAX_CLASS_DRIVER > 1 |
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✓✓ |
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for (class_index = 0; class_index < _ux_system_host -> ux_system_host_max_class; class_index++) |
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{ |
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#endif |
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/* Check if this class driver is used. */ |
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✓✓ |
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if (class_inst -> ux_host_class_status == UX_USED) |
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{ |
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/* We have found a potential candidate. Call this registered class entry function. */ |
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status = class_inst -> ux_host_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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/* Yes, return this class pointer. */ |
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return(class_inst); |
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} |
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} |
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#if UX_MAX_CLASS_DRIVER > 1 |
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/* Move to the next registered class. */ |
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class_inst ++; |
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} |
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#endif |
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/* There is no driver who want to own this class! */ |
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return(UX_NULL); |
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} |