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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** HID Keyboard Client */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_class_hid.h" |
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#include "ux_host_class_hid_keyboard.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_class_hid_keyboard_thread PORTABLE C */ |
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/* 6.1.10 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This file contains the keyboard thread used to process the changes */ |
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/* in the keyboard LEDs. */ |
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/* */ |
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/* It's for RTOS mode. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* keyboard_instance The keyboard instance for */ |
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/* there was a change in LEDs */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_semaphore_get Get signal semaphore */ |
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/* _ux_host_class_hid_report_id_get Get report ID */ |
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/* _ux_host_class_hid_report_set Do SET_REPORT */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* ThreadX */ |
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/* */ |
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/**************************************************************************/ |
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VOID _ux_host_class_hid_keyboard_thread(ULONG thread_input) |
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{ |
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UX_HOST_CLASS_HID *hid; |
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UX_HOST_CLASS_HID_CLIENT_REPORT client_report; |
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UX_HOST_CLASS_HID_REPORT_GET_ID report_id; |
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UINT status; |
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UX_HOST_CLASS_HID_KEYBOARD *keyboard_instance; |
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/* Cast the thread_input variable into the proper format. */ |
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UX_THREAD_EXTENSION_PTR_GET(keyboard_instance, UX_HOST_CLASS_HID_KEYBOARD, thread_input) |
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/* Loop forever waiting for changes signaled through the semaphore. */ |
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while (1) |
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{ |
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/* Wait for the semaphore to be put by the root hub or a regular hub. */ |
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status = _ux_host_semaphore_get(&keyboard_instance -> ux_host_class_hid_keyboard_semaphore, UX_WAIT_FOREVER); |
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/* The semaphore could be awaken because the semaphore was destroyed by the HID client |
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when the keyboard is removed. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* We got awaken by the keyboard callback which indicates a change on the LEDs has to happen. |
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We need to build the field for the leds. */ |
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keyboard_instance -> ux_host_class_hid_keyboard_led_mask = keyboard_instance -> ux_host_class_hid_keyboard_alternate_key_state & |
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UX_HID_KEYBOARD_STATE_MASK_LOCK; |
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/* Recall the HID instance for this client. */ |
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hid = keyboard_instance -> ux_host_class_hid_keyboard_hid; |
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/* We need to find the OUTPUT report for the keyboard LEDs. */ |
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report_id.ux_host_class_hid_report_get_report = UX_NULL; |
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report_id.ux_host_class_hid_report_get_type = UX_HOST_CLASS_HID_REPORT_TYPE_OUTPUT; |
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status = _ux_host_class_hid_report_id_get(hid, &report_id); |
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/* The report ID should exist. If there is an error, we do not proceed. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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{ |
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/* Memorize the report pointer. */ |
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client_report.ux_host_class_hid_client_report = report_id.ux_host_class_hid_report_get_report; |
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/* The report set is raw since the LEDs mask is already in the right format. */ |
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client_report.ux_host_class_hid_client_report_flags = UX_HOST_CLASS_HID_REPORT_RAW; |
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/* The length of this report is 1 byte. */ |
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client_report.ux_host_class_hid_client_report_length = 1; |
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/* The output report buffer is the LED mask field. */ |
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client_report.ux_host_class_hid_client_report_buffer = &keyboard_instance -> ux_host_class_hid_keyboard_led_mask; |
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/* The HID class will perform the SET_REPORT command. */ |
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_ux_host_class_hid_report_set(hid, &client_report); |
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} |
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} |
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else |
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/* The thread should terminate upon a semaphore error. */ |
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return; |
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} |
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} |
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