141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/**
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* Copyright 2021 Johannes Marbach
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*
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* This file is part of buffyboard, hereafter referred to as the program.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "uinput_device.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/uinput.h>
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/**
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* Static variables
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*/
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static int fd = -1;
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struct input_event event;
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/**
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* Static prototypes
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*/
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/**
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* Emit an event on the device.
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* @param type event type
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* @param code event code
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* @param value event value
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* @return true if emitting the event was succesful, false otherwise
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*/
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static bool uinput_device_emit(int type, int code, int value);
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/**
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* Emit a synchronisation event on the device
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* @return true if emitting the event was succesful, false otherwise
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*/
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static bool uinput_device_synchronise();
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/**
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* Static functions
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*/
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static bool uinput_device_emit(int type, int code, int value) {
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event.type = type;
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event.code = code;
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event.value = value;
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event.time.tv_sec = 0;
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event.time.tv_usec = 0;
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if (write(fd, &event, sizeof(event)) != sizeof(event)) {
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perror("Could not emit event");
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return false;
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}
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return true;
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}
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static bool uinput_device_synchronise() {
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return uinput_device_emit(EV_SYN, SYN_REPORT, 0);
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}
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/**
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* Public functions
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*/
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bool bb_uinput_device_init(int * const scancodes, int num_scancodes) {
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fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
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if (fd < 0) {
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perror("Could not open /dev/uinput");
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return false;
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}
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if (ioctl(fd, UI_SET_EVBIT, EV_KEY) < 0) {
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perror("Could not set EVBIT for EV_KEY");
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return false;
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}
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if (ioctl(fd, UI_SET_EVBIT, EV_SYN) < 0) {
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perror("Could not set EVBIT for EV_SYN");
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return false;
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}
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for (int i = 0; i < num_scancodes; ++i) {
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if (ioctl(fd, UI_SET_KEYBIT, scancodes[i]) < 0) {
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perror("Could not set KEYBIT");
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return false;
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}
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}
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struct uinput_user_dev device;
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memset(&device, 0, sizeof(device));
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strcpy(device.name, "buffyboard");
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device.id.bustype = BUS_USB;
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device.id.vendor = 1;
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device.id.product = 1;
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device.id.version = 1;
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if (ioctl(fd, UI_DEV_SETUP, &device) < 0) {
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perror("Could not set up uinput device");
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return false;
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}
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if (ioctl(fd, UI_DEV_CREATE) < 0) {
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perror("Could not create uinput device");
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return false;
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}
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memset(&event, 0, sizeof(event));
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return true;
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}
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bool bb_uinput_device_emit_key_down(int scancode) {
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return uinput_device_emit(EV_KEY, scancode, 1) && uinput_device_synchronise();
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}
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bool bb_uinput_device_emit_key_up(int scancode) {
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return uinput_device_emit(EV_KEY, scancode, 0) && uinput_device_synchronise();
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}
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