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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_class_call PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will call all the registered classes to the USBX */
/* stack. Each class will have the possibility to own the device or */
/* one of the interfaces of a device. */
/* */
/* INPUT */
/* */
/* class_command Class command structure */
/* */
/* OUTPUT */
/* */
/* Number of owners */
/* */
/* CALLS */
/* */
/* (ux_host_class_entry_function) Class entry function */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* optimized based on compile */
/* definitions, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UX_HOST_CLASS *_ux_host_stack_class_call(UX_HOST_CLASS_COMMAND *class_command)
{
UINT status = UX_NO_CLASS_MATCH;
UX_HOST_CLASS *class_inst;
#if UX_MAX_CLASS_DRIVER > 1
ULONG class_index;
#endif
/* Start from the 1st registered classes with USBX. */
class_inst = _ux_system_host -> ux_system_host_class_array;
/* Parse all the class drivers. */
#if UX_MAX_CLASS_DRIVER > 1
for (class_index = 0; class_index < _ux_system_host -> ux_system_host_max_class; class_index++)
{
#endif
/* Check if this class driver is used. */
if (class_inst -> ux_host_class_status == UX_USED)
{
/* We have found a potential candidate. Call this registered class entry function. */
status = class_inst -> ux_host_class_entry_function(class_command);
/* The status tells us if the registered class wants to own this class. */
if (status == UX_SUCCESS)
{
/* Yes, return this class pointer. */
return(class_inst);
}
}
#if UX_MAX_CLASS_DRIVER > 1
/* Move to the next registered class. */
class_inst ++;
}
#endif
/* There is no driver who want to own this class! */
return(UX_NULL);
}