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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 */
/** */
/** HID Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hid.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hid_local_item_parse PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function parses a local item from the report descriptor. */
/* */
/* INPUT */
/* */
/* hid Pointer to HID class */
/* item Pointer to item */
/* descriptor Pointer to descriptor */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_hid_item_data_get Get data item */
/* */
/* CALLED BY */
/* */
/* HID Class */
/* */
/**************************************************************************/
UINT _ux_host_class_hid_local_item_parse(UX_HOST_CLASS_HID *hid, UX_HOST_CLASS_HID_ITEM *item, UCHAR *descriptor)
{
UX_HOST_CLASS_HID_PARSER *hid_parser;
ULONG usage;
ULONG usage_min;
ULONG usage_max;
ULONG delimiter_set;
/* Get the temporary parser structure pointer. */
hid_parser = &hid -> ux_host_class_hid_parser;
/* Analyze the tag. */
switch (item -> ux_host_class_hid_item_report_tag)
{
case UX_HOST_CLASS_HID_LOCAL_TAG_USAGE:
/* Local usage tag, check if we have an overflow. */
if (hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage == UX_HOST_CLASS_HID_USAGES)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_USAGE_OVERFLOW);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_HID_USAGE_OVERFLOW, hid, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_HID_USAGE_OVERFLOW);
}
/* Obtain the usage from the descriptor. */
usage = _ux_host_class_hid_item_data_get(descriptor, item);
/* Combine the global usage with the local usage to form a unique usage ID. */
usage |= (hid_parser -> ux_host_class_hid_parser_global.ux_host_class_hid_global_item_usage_page << 16);
/* Add the usage to the local usage table. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usages[hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage] = usage;
/* We have one more usage now. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage++;
break;
case UX_HOST_CLASS_HID_LOCAL_TAG_USAGE_MINIMUM:
/* Usage Minimum tag. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_min =
(ULONG) _ux_host_class_hid_item_data_get(descriptor, item);
break;
case UX_HOST_CLASS_HID_LOCAL_TAG_USAGE_MAXIMUM:
/* Usage Maximum tag. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_max =
(ULONG) _ux_host_class_hid_item_data_get(descriptor, item);
/* Check if the maximum value is coherent with the minimum. */
if (hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_max < hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_min)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_MIN_MAX_ERROR);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_HID_MIN_MAX_ERROR, hid, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_HID_MIN_MAX_ERROR);
}
/* Get the boundaries for the usage values which are defined when encountering the USAGE MAX tag. */
usage_min = (ULONG)(hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_min);
usage_max = (ULONG)(hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usage_max);
while (usage_min <= usage_max)
{
/* Check if we can still add this usage. */
if (hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage == UX_HOST_CLASS_HID_USAGES)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_USAGE_OVERFLOW);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_HID_USAGE_OVERFLOW, hid, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_HID_USAGE_OVERFLOW);
}
/* Combine the global usage with the local usage to form a unique usage ID. */
usage = usage_min | (hid_parser -> ux_host_class_hid_parser_global.ux_host_class_hid_global_item_usage_page << 16);
/* Add the usage to the local usage table. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_usages[hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage] = usage;
/* We have one more usage now. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_number_usage++;
/* Next usage value. */
usage_min++;
}
break;
case UX_HOST_CLASS_HID_LOCAL_TAG_DELIMITER:
/* Obtain the delimiter set from the descriptor. */
delimiter_set = _ux_host_class_hid_item_data_get(descriptor, item);
/* We should have either an open or a close. */
switch (delimiter_set)
{
case UX_HOST_CLASS_HID_DELIMITER_OPEN:
/* Recursive delimiter opens are not supported. */
if (hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_delimiter_level == 1)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_DELIMITER_ERROR);
return(UX_HOST_CLASS_HID_DELIMITER_ERROR);
}
/* Mark the opening of the delimiter. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_delimiter_level = 1;
break;
case UX_HOST_CLASS_HID_DELIMITER_CLOSE:
/* Ensure we had an open delimiter before. */
if (hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_delimiter_level == 0)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_DELIMITER_ERROR);
return(UX_HOST_CLASS_HID_DELIMITER_ERROR);
}
/* Mark the closing of the delimiter. */
hid_parser -> ux_host_class_hid_parser_local.ux_host_class_hid_local_item_delimiter_level = 0;
break;
default:
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_DELIMITER_ERROR);
/* We got a wrong delimiter set. */
return(UX_HOST_CLASS_HID_DELIMITER_ERROR);
}
break;
default:
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_HID_TAG_UNSUPPORTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_HID_TAG_UNSUPPORTED, hid, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* This tag is either unknown or unsupported. */
return(UX_HOST_CLASS_HID_TAG_UNSUPPORTED);
}
/* Return status. Always SUCCESS if we get here.*/
return(UX_SUCCESS);
}
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