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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 Keyboard Client */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hid.h"
#include "ux_host_class_hid_keyboard.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hid_keyboard_thread PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file contains the keyboard thread used to process the changes */
/* in the keyboard LEDs. */
/* */
/* It's for RTOS mode. */
/* */
/* INPUT */
/* */
/* keyboard_instance The keyboard instance for */
/* there was a change in LEDs */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_host_semaphore_get Get signal semaphore */
/* _ux_host_class_hid_report_id_get Get report ID */
/* _ux_host_class_hid_report_set Do SET_REPORT */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_host_class_hid_keyboard_thread(ULONG thread_input)
{
UX_HOST_CLASS_HID *hid;
UX_HOST_CLASS_HID_CLIENT_REPORT client_report;
UX_HOST_CLASS_HID_REPORT_GET_ID report_id;
UINT status;
UX_HOST_CLASS_HID_KEYBOARD *keyboard_instance;
/* Cast the thread_input variable into the proper format. */
UX_THREAD_EXTENSION_PTR_GET(keyboard_instance, UX_HOST_CLASS_HID_KEYBOARD, thread_input)
/* Loop forever waiting for changes signaled through the semaphore. */
while (1)
{
/* Wait for the semaphore to be put by the root hub or a regular hub. */
status = _ux_host_semaphore_get(&keyboard_instance -> ux_host_class_hid_keyboard_semaphore, UX_WAIT_FOREVER);
/* The semaphore could be awaken because the semaphore was destroyed by the HID client
when the keyboard is removed. */
if (status == UX_SUCCESS)
{
/* We got awaken by the keyboard callback which indicates a change on the LEDs has to happen.
We need to build the field for the leds. */
keyboard_instance -> ux_host_class_hid_keyboard_led_mask = keyboard_instance -> ux_host_class_hid_keyboard_alternate_key_state &
UX_HID_KEYBOARD_STATE_MASK_LOCK;
/* Recall the HID instance for this client. */
hid = keyboard_instance -> ux_host_class_hid_keyboard_hid;
/* We need to find the OUTPUT report for the keyboard LEDs. */
report_id.ux_host_class_hid_report_get_report = UX_NULL;
report_id.ux_host_class_hid_report_get_type = UX_HOST_CLASS_HID_REPORT_TYPE_OUTPUT;
status = _ux_host_class_hid_report_id_get(hid, &report_id);
/* The report ID should exist. If there is an error, we do not proceed. */
if (status == UX_SUCCESS)
{
/* Memorize the report pointer. */
client_report.ux_host_class_hid_client_report = report_id.ux_host_class_hid_report_get_report;
/* The report set is raw since the LEDs mask is already in the right format. */
client_report.ux_host_class_hid_client_report_flags = UX_HOST_CLASS_HID_REPORT_RAW;
/* The length of this report is 1 byte. */
client_report.ux_host_class_hid_client_report_length = 1;
/* The output report buffer is the LED mask field. */
client_report.ux_host_class_hid_client_report_buffer = &keyboard_instance -> ux_host_class_hid_keyboard_led_mask;
/* The HID class will perform the SET_REPORT command. */
_ux_host_class_hid_report_set(hid, &client_report);
}
}
else
/* The thread should terminate upon a semaphore error. */
return;
}
}
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