402 lines
11 KiB
C++
402 lines
11 KiB
C++
/*************************************************************************/
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/* joystick_linux.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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//author: Andreas Haas <hondres, liugam3@gmail.com>
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#ifdef __linux__
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#include "joystick_linux.h"
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#include "print_string.h"
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#include <libevdev/libevdev.h>
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#include <libudev.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <cstring>
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static const char* ignore_str = "/dev/input/js";
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joystick_linux::Joystick::Joystick() {
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fd = -1;
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dpad = 0;
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}
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void joystick_linux::Joystick::reset() {
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num_buttons = 0;
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num_axes = 0;
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dpad = 0;
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fd = -1;
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for (int i=0; i < MAX_ABS; i++) {
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abs_map[i] = -1;
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}
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}
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joystick_linux::joystick_linux(InputDefault *in)
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{
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exit_udev = false;
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input = in;
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joy_mutex = Mutex::create();
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joy_thread = Thread::create(joy_thread_func, this);
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}
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joystick_linux::~joystick_linux() {
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exit_udev = true;
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Thread::wait_to_finish(joy_thread);
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close_joystick();
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}
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void joystick_linux::joy_thread_func(void *p_user) {
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if (p_user) {
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joystick_linux* joy = (joystick_linux*) p_user;
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joy->run_joystick_thread();
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}
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return;
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}
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void joystick_linux::run_joystick_thread() {
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udev *_udev = udev_new();
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ERR_FAIL_COND(!_udev);
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enumerate_joysticks(_udev);
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monitor_joysticks(_udev);
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udev_unref(_udev);
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}
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void joystick_linux::enumerate_joysticks(udev *p_udev) {
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udev_enumerate *enumerate;
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udev_list_entry *devices, *dev_list_entry;
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udev_device *dev;
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enumerate = udev_enumerate_new(p_udev);
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udev_enumerate_add_match_subsystem(enumerate,"input");
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udev_enumerate_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
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udev_enumerate_scan_devices(enumerate);
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devices = udev_enumerate_get_list_entry(enumerate);
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udev_list_entry_foreach(dev_list_entry, devices) {
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const char* path = udev_list_entry_get_name(dev_list_entry);
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dev = udev_device_new_from_syspath(p_udev, path);
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const char* devnode = udev_device_get_devnode(dev);
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if (devnode != NULL && strstr(devnode, ignore_str) == NULL) {
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joy_mutex->lock();
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open_joystick(devnode);
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joy_mutex->unlock();
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}
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udev_device_unref(dev);
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}
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udev_enumerate_unref(enumerate);
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}
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void joystick_linux::monitor_joysticks(udev *p_udev) {
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udev_device *dev = NULL;
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udev_monitor *mon = udev_monitor_new_from_netlink(p_udev, "udev");
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udev_monitor_filter_add_match_subsystem_devtype(mon, "input", NULL);
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udev_monitor_enable_receiving(mon);
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int fd = udev_monitor_get_fd(mon);
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while (!exit_udev) {
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fd_set fds;
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struct timeval tv;
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int ret;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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ret = select(fd+1, &fds, NULL, NULL, &tv);
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/* Check if our file descriptor has received data. */
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if (ret > 0 && FD_ISSET(fd, &fds)) {
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/* Make the call to receive the device.
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select() ensured that this will not block. */
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dev = udev_monitor_receive_device(mon);
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if (dev && udev_device_get_devnode(dev) != 0) {
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joy_mutex->lock();
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const char* action = udev_device_get_action(dev);
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const char* devnode = udev_device_get_devnode(dev);
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if (strstr(devnode, ignore_str) == NULL) {
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if (strcmp(action, "add") == 0)
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open_joystick(devnode);
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else if (strcmp(action, "remove") == 0)
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close_joystick(get_joy_from_path(devnode));
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}
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udev_device_unref(dev);
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joy_mutex->unlock();
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}
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}
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usleep(50000);
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}
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//printf("exit udev\n");
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udev_monitor_unref(mon);
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}
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int joystick_linux::get_free_joy_slot() const {
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for (int i = 0; i < JOYSTICKS_MAX; i++) {
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if (joysticks[i].fd == -1) return i;
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}
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return -1;
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}
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int joystick_linux::get_joy_from_path(String p_path) const {
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for (int i = 0; i < JOYSTICKS_MAX; i++) {
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if (joysticks[i].devpath == p_path) {
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return i;
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}
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}
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return -2;
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}
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void joystick_linux::close_joystick(int p_id) {
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if (p_id == -1) {
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for (int i=0; i<JOYSTICKS_MAX; i++) {
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close_joystick(i);
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};
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return;
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}
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else if (p_id < 0) return;
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Joystick &joy = joysticks[p_id];
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if (joy.fd != -1) {
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libevdev_free(joy.dev);
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close(joy.fd);
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joy.fd = -1;
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input->joy_connection_changed(p_id, false, "");
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};
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};
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static String _hex_str(uint8_t p_byte) {
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static const char* dict = "0123456789abcdef";
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char ret[3];
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ret[2] = 0;
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ret[0] = dict[p_byte>>4];
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ret[1] = dict[p_byte & 0xF];
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return ret;
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};
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void joystick_linux::setup_joystick_properties(int p_id) {
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Joystick* joy = &joysticks[p_id];
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libevdev* dev = joy->dev;
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for (int i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
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if (libevdev_has_event_code(dev, EV_KEY, i)) {
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joy->key_map[i] = joy->num_buttons++;
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}
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}
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for (int i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
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if (libevdev_has_event_code(dev, EV_KEY, i)) {
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joy->key_map[i] = joy->num_buttons++;
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}
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}
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for (int i = 0; i < ABS_MISC; ++i) {
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/* Skip hats */
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if (i == ABS_HAT0X) {
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i = ABS_HAT3Y;
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continue;
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}
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if (libevdev_has_event_code(dev, EV_ABS, i)) {
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joy->abs_map[i] = joy->num_axes++;
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}
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}
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}
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void joystick_linux::open_joystick(const char *p_path) {
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int joy_num = get_free_joy_slot();
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int fd = open(p_path, O_RDONLY | O_NONBLOCK);
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if (fd != -1 && joy_num != -1) {
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int rc = libevdev_new_from_fd(fd, &joysticks[joy_num].dev);
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if (rc < 0) {
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fprintf(stderr, "Failed to init libevdev (%s)\n", strerror(-rc));
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return;
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}
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libevdev *dev = joysticks[joy_num].dev;
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//check if the device supports basic gamepad events, prevents certain keyboards from
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//being detected as joysticks
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if (libevdev_has_event_type(dev, EV_ABS) && libevdev_has_event_type(dev, EV_KEY) &&
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(libevdev_has_event_code(dev, EV_KEY, BTN_A) || libevdev_has_event_code(dev, EV_KEY, BTN_THUMBL) || libevdev_has_event_code(dev, EV_KEY, BTN_TOP))) {
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char uid[128];
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String name = libevdev_get_name(dev);
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uint16_t bus = __bswap_16(libevdev_get_id_bustype(dev));
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uint16_t vendor = __bswap_16(libevdev_get_id_vendor(dev));
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uint16_t product = __bswap_16(libevdev_get_id_product(dev));
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uint16_t version = __bswap_16(libevdev_get_id_version(dev));
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joysticks[joy_num].reset();
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Joystick &joy = joysticks[joy_num];
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joy.fd = fd;
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joy.devpath = String(p_path);
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setup_joystick_properties(joy_num);
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sprintf(uid, "%04x%04x", bus, 0);
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if (vendor && product && version) {
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sprintf(uid + String(uid).length(), "%04x%04x%04x%04x%04x%04x", vendor,0,product,0,version,0);
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input->joy_connection_changed(joy_num, true, name, uid);
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}
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else {
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String uidname = uid;
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int uidlen = MIN(name.length(), 11);
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for (int i=0; i<uidlen; i++) {
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uidname = uidname + _hex_str(name[i]);
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}
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uidname += "00";
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input->joy_connection_changed(joy_num, true, name, uidname);
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}
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}
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else {
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//device is not a gamepad, clean up
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libevdev_free(dev);
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close(fd);
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}
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}
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}
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InputDefault::JoyAxis joystick_linux::axis_correct(const input_absinfo *p_abs, int p_value) const {
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int min = p_abs->minimum;
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int max = p_abs->maximum;
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InputDefault::JoyAxis jx;
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if (min < 0) {
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jx.min = -1;
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if (p_value < 0) {
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jx.value = (float) -p_value / min;
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}
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jx.value = (float) p_value / max;
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}
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if (min == 0) {
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jx.min = 0;
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jx.value = 0.0f + (float) p_value / max;
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}
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return jx;
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}
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uint32_t joystick_linux::process_joysticks(uint32_t p_event_id) {
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if (joy_mutex->try_lock() != OK) {
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return p_event_id;
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}
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for (int i=0; i<JOYSTICKS_MAX; i++) {
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if (joysticks[i].fd == -1) continue;
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input_event ev;
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Joystick* joy = &joysticks[i];
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libevdev* dev = joy->dev;
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int rc = 1;
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rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
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if (rc < 0 && rc != -EAGAIN) {
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continue;
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}
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while (rc == LIBEVDEV_READ_STATUS_SYNC || rc == LIBEVDEV_READ_STATUS_SUCCESS) {
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switch (ev.type) {
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case EV_KEY:
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p_event_id = input->joy_button(p_event_id, i, joy->key_map[ev.code], ev.value);
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break;
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case EV_ABS:
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switch (ev.code) {
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case ABS_HAT0X:
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if (ev.value != 0) {
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if (ev.value < 0) joy->dpad |= InputDefault::HAT_MASK_LEFT;
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else joy->dpad |= InputDefault::HAT_MASK_RIGHT;
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}
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else joy->dpad &= ~(InputDefault::HAT_MASK_LEFT | InputDefault::HAT_MASK_RIGHT);
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p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
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break;
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case ABS_HAT0Y:
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if (ev.value != 0) {
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if (ev.value < 0) joy->dpad |= InputDefault::HAT_MASK_UP;
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else joy->dpad |= InputDefault::HAT_MASK_DOWN;
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}
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else joy->dpad &= ~(InputDefault::HAT_MASK_UP | InputDefault::HAT_MASK_DOWN);
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p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
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break;
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default:
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if (joy->abs_map[ev.code] != -1) {
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InputDefault::JoyAxis value = axis_correct(libevdev_get_abs_info(dev, ev.code), ev.value);
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p_event_id = input->joy_axis(p_event_id, i, joy->abs_map[ev.code], value);
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}
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break;
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}
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break;
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}
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rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
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}
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}
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joy_mutex->unlock();
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return p_event_id;
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}
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#endif
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