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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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_unregister PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function unregisters a USB class from the USB stack. */
/* */
/* Note following steps must be done before host class unregister: */
/* All devices related to the class must be removed. */
/* */
/* INPUT */
/* */
/* class_name Name of class */
/* class_entry_function Entry function of the class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* UX_SUCCESS Class unregistered */
/* UX_NO_CLASS_MATCH Class not found */
/* */
/* CALLS */
/* */
/* (class_entry_function) Entry function of the class */
/* */
/* CALLED BY */
/* */
/* Application */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_class_unregister(UINT (*class_entry_function)(struct UX_HOST_CLASS_COMMAND_STRUCT *))
{
UX_HOST_CLASS *class_inst;
UX_HOST_CLASS_COMMAND class_command;
#if UX_MAX_CLASS_DRIVER > 1
ULONG class_index;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_CLASS_UNREGISTER, class_entry_function, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* Get first class. */
class_inst = _ux_system_host -> ux_system_host_class_array;
#if UX_MAX_CLASS_DRIVER > 1
/* We need to parse the class table to find right class instance. */
for (class_index = 0; class_index < _ux_system_host -> ux_system_host_max_class; class_index++)
{
#endif
/* Check if the class is expected. */
if (class_inst -> ux_host_class_entry_function == class_entry_function)
{
/* Initialize the class command with the generic parameters. */
class_command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_DESTROY;
class_command.ux_host_class_command_class_ptr = (VOID *)class_inst;
/* Invoke command for class destroy. */
class_inst -> ux_host_class_entry_function(&class_command);
/* Mark as free. */
class_inst -> ux_host_class_entry_function = UX_NULL;
class_inst -> ux_host_class_status = UX_UNUSED;
/* Class unregistered success. */
return(UX_SUCCESS);
}
#if UX_MAX_CLASS_DRIVER > 1
/* Move to the next class. */
class_inst ++;
}
#endif
/* No more entries in the class table. */
return(UX_NO_CLASS_MATCH);
}
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