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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 Remote Control Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hid.h"
#include "ux_host_class_hid_remote_control.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hid_remote_control_callback PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the callback mechanism for a report registration. */
/* */
/* INPUT */
/* */
/* callback Pointer to callback */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* HID Remote Control Class */
/* */
/**************************************************************************/
VOID _ux_host_class_hid_remote_control_callback(UX_HOST_CLASS_HID_REPORT_CALLBACK *callback)
{
UX_HOST_CLASS_HID_CLIENT *hid_client;
UX_HOST_CLASS_HID_REMOTE_CONTROL *remote_control_instance;
ULONG *array_head;
ULONG *array_tail;
ULONG *array_end;
ULONG *array_start;
ULONG *array_head_next;
/* Get the HID client instance that issued the callback. */
hid_client = callback -> ux_host_class_hid_report_callback_client;
/* Get the remote control local instance. */
remote_control_instance = (UX_HOST_CLASS_HID_REMOTE_CONTROL *) hid_client -> ux_host_class_hid_client_local_instance;
/* Load the remote control usage/value array info. */
array_start = remote_control_instance -> ux_host_class_hid_remote_control_usage_array;
array_end = array_start + UX_HOST_CLASS_HID_REMOTE_CONTROL_USAGE_ARRAY_LENGTH;
array_head = remote_control_instance -> ux_host_class_hid_remote_control_usage_array_head;
array_tail = remote_control_instance -> ux_host_class_hid_remote_control_usage_array_tail;
/* We have a single usage/value. We have to store it into the array. If the array overflows,
there is no mechanism for flow control here so we ignore the usage/value until the
applications makes more room in the array. */
/* Get position where next head will be. */
array_head_next = array_head + 2;
/* The head always points to where we will insert the next element. This
is the reason for the wrap. */
if (array_head_next == array_end)
array_head_next = array_start;
/* Do we have enough space to store the new usage? */
if (array_head_next != array_tail)
{
/* Yes, we have some space. */
*array_head = callback -> ux_host_class_hid_report_callback_usage;
*(array_head + 1) = callback -> ux_host_class_hid_report_callback_value;
/* Now update the array head. */
remote_control_instance -> ux_host_class_hid_remote_control_usage_array_head = array_head_next;
}
else
{
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_HID_REMOTE_CONTROL_CALLBACK, hid_client, remote_control_instance, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Notify application. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
}
/* Return to caller. */
return;
}
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