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godot/platform/x11/joypad_linux.cpp

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/*************************************************************************/
/* joypad_linux.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef JOYDEV_ENABLED
#include "joypad_linux.h"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <unistd.h>
#ifdef UDEV_ENABLED
#include "libudev-so_wrap.h"
#endif
#define LONG_BITS (sizeof(long) * 8)
#define test_bit(nr, addr) (((1UL << ((nr) % LONG_BITS)) & ((addr)[(nr) / LONG_BITS])) != 0)
#define NBITS(x) ((((x)-1) / LONG_BITS) + 1)
#ifdef UDEV_ENABLED
static const char *ignore_str = "/dev/input/js";
#endif
JoypadLinux::Joypad::Joypad() {
fd = -1;
dpad = 0;
devpath = "";
for (int i = 0; i < MAX_ABS; i++) {
abs_info[i] = nullptr;
}
}
JoypadLinux::Joypad::~Joypad() {
for (int i = 0; i < MAX_ABS; i++) {
if (abs_info[i]) {
memdelete(abs_info[i]);
}
}
}
void JoypadLinux::Joypad::reset() {
dpad = 0;
fd = -1;
for (int i = 0; i < MAX_ABS; i++) {
abs_map[i] = -1;
curr_axis[i] = 0;
}
}
JoypadLinux::JoypadLinux(InputDefault *in) {
#ifdef UDEV_ENABLED
use_udev = initialize_libudev() == 0;
if (use_udev) {
print_verbose("JoypadLinux: udev enabled and loaded successfully.");
} else {
print_verbose("JoypadLinux: udev enabled, but couldn't be loaded. Falling back to /dev/input to detect joypads.");
}
#else
print_verbose("JoypadLinux: udev disabled, parsing /dev/input to detect joypads.");
#endif
input = in;
joy_thread.start(joy_thread_func, this);
}
JoypadLinux::~JoypadLinux() {
exit_monitor.set();
joy_thread.wait_to_finish();
close_joypad();
}
void JoypadLinux::joy_thread_func(void *p_user) {
if (p_user) {
JoypadLinux *joy = (JoypadLinux *)p_user;
joy->run_joypad_thread();
}
}
void JoypadLinux::run_joypad_thread() {
#ifdef UDEV_ENABLED
if (use_udev) {
udev *_udev = udev_new();
if (!_udev) {
use_udev = false;
ERR_PRINT("Failed getting an udev context, falling back to parsing /dev/input.");
monitor_joypads();
} else {
enumerate_joypads(_udev);
monitor_joypads(_udev);
udev_unref(_udev);
}
} else {
monitor_joypads();
}
#else
monitor_joypads();
#endif
}
#ifdef UDEV_ENABLED
void JoypadLinux::enumerate_joypads(udev *p_udev) {
udev_enumerate *enumerate;
udev_list_entry *devices, *dev_list_entry;
udev_device *dev;
enumerate = udev_enumerate_new(p_udev);
udev_enumerate_add_match_subsystem(enumerate, "input");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(dev_list_entry, devices) {
const char *path = udev_list_entry_get_name(dev_list_entry);
dev = udev_device_new_from_syspath(p_udev, path);
const char *devnode = udev_device_get_devnode(dev);
if (devnode) {
String devnode_str = devnode;
if (devnode_str.find(ignore_str) == -1) {
joy_mutex.lock();
open_joypad(devnode);
joy_mutex.unlock();
}
}
udev_device_unref(dev);
}
udev_enumerate_unref(enumerate);
}
void JoypadLinux::monitor_joypads(udev *p_udev) {
udev_device *dev = nullptr;
udev_monitor *mon = udev_monitor_new_from_netlink(p_udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "input", nullptr);
udev_monitor_enable_receiving(mon);
int fd = udev_monitor_get_fd(mon);
while (!exit_monitor.is_set()) {
fd_set fds;
struct timeval tv;
int ret;
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = 0;
tv.tv_usec = 0;
ret = select(fd + 1, &fds, nullptr, nullptr, &tv);
/* Check if our file descriptor has received data. */
if (ret > 0 && FD_ISSET(fd, &fds)) {
/* Make the call to receive the device.
select() ensured that this will not block. */
dev = udev_monitor_receive_device(mon);
if (dev && udev_device_get_devnode(dev) != nullptr) {
joy_mutex.lock();
String action = udev_device_get_action(dev);
const char *devnode = udev_device_get_devnode(dev);
if (devnode) {
String devnode_str = devnode;
if (devnode_str.find(ignore_str) == -1) {
if (action == "add") {
open_joypad(devnode);
} else if (String(action) == "remove") {
close_joypad(get_joy_from_path(devnode));
}
}
}
udev_device_unref(dev);
joy_mutex.unlock();
}
}
usleep(50000);
}
udev_monitor_unref(mon);
}
#endif
void JoypadLinux::monitor_joypads() {
while (!exit_monitor.is_set()) {
joy_mutex.lock();
DIR *input_directory;
input_directory = opendir("/dev/input");
if (input_directory) {
struct dirent *current;
char fname[64];
while ((current = readdir(input_directory)) != nullptr) {
if (strncmp(current->d_name, "event", 5) != 0) {
continue;
}
sprintf(fname, "/dev/input/%.*s", 16, current->d_name);
if (attached_devices.find(fname) == -1) {
open_joypad(fname);
}
}
}
closedir(input_directory);
joy_mutex.unlock();
usleep(1000000); // 1s
}
}
int JoypadLinux::get_joy_from_path(String p_path) const {
for (int i = 0; i < JOYPADS_MAX; i++) {
if (joypads[i].devpath == p_path) {
return i;
}
}
return -2;
}
void JoypadLinux::close_joypad(int p_id) {
if (p_id == -1) {
for (int i = 0; i < JOYPADS_MAX; i++) {
close_joypad(i);
};
return;
} else if (p_id < 0) {
return;
}
Joypad &joy = joypads[p_id];
if (joy.fd != -1) {
close(joy.fd);
joy.fd = -1;
attached_devices.remove(attached_devices.find(joy.devpath));
input->joy_connection_changed(p_id, false, "");
};
}
static String _hex_str(uint8_t p_byte) {
static const char *dict = "0123456789abcdef";
char ret[3];
ret[2] = 0;
ret[0] = dict[p_byte >> 4];
ret[1] = dict[p_byte & 0xF];
return ret;
}
void JoypadLinux::setup_joypad_properties(int p_id) {
Joypad *joy = &joypads[p_id];
unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
int num_buttons = 0;
int num_axes = 0;
if ((ioctl(joy->fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
(ioctl(joy->fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
return;
}
for (int i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
if (test_bit(i, keybit)) {
joy->key_map[i] = num_buttons++;
}
}
for (int i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
if (test_bit(i, keybit)) {
joy->key_map[i] = num_buttons++;
}
}
for (int i = 0; i < ABS_MISC; ++i) {
/* Skip hats */
if (i == ABS_HAT0X) {
i = ABS_HAT3Y;
continue;
}
if (test_bit(i, absbit)) {
joy->abs_map[i] = num_axes++;
joy->abs_info[i] = memnew(input_absinfo);
if (ioctl(joy->fd, EVIOCGABS(i), joy->abs_info[i]) < 0) {
memdelete(joy->abs_info[i]);
joy->abs_info[i] = nullptr;
}
}
}
joy->force_feedback = false;
joy->ff_effect_timestamp = 0;
unsigned long ffbit[NBITS(FF_CNT)];
if (ioctl(joy->fd, EVIOCGBIT(EV_FF, sizeof(ffbit)), ffbit) != -1) {
if (test_bit(FF_RUMBLE, ffbit)) {
joy->force_feedback = true;
}
}
}
void JoypadLinux::open_joypad(const char *p_path) {
int joy_num = input->get_unused_joy_id();
int fd = open(p_path, O_RDWR | O_NONBLOCK);
if (fd != -1 && joy_num != -1) {
unsigned long evbit[NBITS(EV_MAX)] = { 0 };
unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
// add to attached devices so we don't try to open it again
attached_devices.push_back(String(p_path));
if ((ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
close(fd);
return;
}
//check if the device supports basic gamepad events, prevents certain keyboards from
//being detected as joypads
if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) &&
(test_bit(ABS_X, absbit) || test_bit(ABS_Y, absbit) || test_bit(ABS_HAT0X, absbit) ||
test_bit(ABS_GAS, absbit) || test_bit(ABS_RUDDER, absbit)) &&
(test_bit(BTN_A, keybit) || test_bit(BTN_THUMBL, keybit) ||
test_bit(BTN_TRIGGER, keybit) || test_bit(BTN_1, keybit))) &&
!(test_bit(EV_ABS, evbit) &&
test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit) &&
test_bit(ABS_RX, absbit) && test_bit(ABS_RY, absbit))) {
close(fd);
return;
}
char uid[128];
char namebuf[128];
String name = "";
input_id inpid;
if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) >= 0) {
name = namebuf;
}
if (ioctl(fd, EVIOCGID, &inpid) < 0) {
close(fd);
return;
}
joypads[joy_num].reset();
Joypad &joy = joypads[joy_num];
joy.fd = fd;
joy.devpath = String(p_path);
setup_joypad_properties(joy_num);
sprintf(uid, "%04x%04x", BSWAP16(inpid.bustype), 0);
if (inpid.vendor && inpid.product && inpid.version) {
uint16_t vendor = BSWAP16(inpid.vendor);
uint16_t product = BSWAP16(inpid.product);
uint16_t version = BSWAP16(inpid.version);
sprintf(uid + String(uid).length(), "%04x%04x%04x%04x%04x%04x", vendor, 0, product, 0, version, 0);
input->joy_connection_changed(joy_num, true, name, uid);
} else {
String uidname = uid;
int uidlen = MIN(name.length(), 11);
for (int i = 0; i < uidlen; i++) {
uidname = uidname + _hex_str(name[i]);
}
uidname += "00";
input->joy_connection_changed(joy_num, true, name, uidname);
}
}
}
void JoypadLinux::joypad_vibration_start(int p_id, float p_weak_magnitude, float p_strong_magnitude, float p_duration, uint64_t p_timestamp) {
Joypad &joy = joypads[p_id];
if (!joy.force_feedback || joy.fd == -1 || p_weak_magnitude < 0.f || p_weak_magnitude > 1.f || p_strong_magnitude < 0.f || p_strong_magnitude > 1.f) {
return;
}
if (joy.ff_effect_id != -1) {
joypad_vibration_stop(p_id, p_timestamp);
}
struct ff_effect effect;
effect.type = FF_RUMBLE;
effect.id = -1;
effect.u.rumble.weak_magnitude = floor(p_weak_magnitude * (float)0xffff);
effect.u.rumble.strong_magnitude = floor(p_strong_magnitude * (float)0xffff);
effect.replay.length = floor(p_duration * 1000);
effect.replay.delay = 0;
if (ioctl(joy.fd, EVIOCSFF, &effect) < 0) {
return;
}
struct input_event play;
play.type = EV_FF;
play.code = effect.id;
play.value = 1;
if (write(joy.fd, (const void *)&play, sizeof(play)) == -1) {
print_verbose("Couldn't write to Joypad device.");
}
joy.ff_effect_id = effect.id;
joy.ff_effect_timestamp = p_timestamp;
}
void JoypadLinux::joypad_vibration_stop(int p_id, uint64_t p_timestamp) {
Joypad &joy = joypads[p_id];
if (!joy.force_feedback || joy.fd == -1 || joy.ff_effect_id == -1) {
return;
}
if (ioctl(joy.fd, EVIOCRMFF, joy.ff_effect_id) < 0) {
return;
}
joy.ff_effect_id = -1;
joy.ff_effect_timestamp = p_timestamp;
}
float JoypadLinux::axis_correct(const input_absinfo *p_abs, int p_value) const {
int min = p_abs->minimum;
int max = p_abs->maximum;
// Convert to a value between -1.0f and 1.0f.
return 2.0f * (p_value - min) / (max - min) - 1.0f;
}
void JoypadLinux::process_joypads() {
if (joy_mutex.try_lock() != OK) {
return;
}
for (int i = 0; i < JOYPADS_MAX; i++) {
if (joypads[i].fd == -1) {
continue;
}
input_event events[32];
Joypad *joy = &joypads[i];
int len;
while ((len = read(joy->fd, events, (sizeof events))) > 0) {
len /= sizeof(events[0]);
for (int j = 0; j < len; j++) {
input_event &ev = events[j];
// ev may be tainted and out of MAX_KEY range, which will cause
// joy->key_map[ev.code] to crash
if (ev.code >= MAX_KEY) {
return;
}
switch (ev.type) {
case EV_KEY:
input->joy_button(i, joy->key_map[ev.code], ev.value);
break;
case EV_ABS:
switch (ev.code) {
case ABS_HAT0X:
if (ev.value != 0) {
if (ev.value < 0) {
joy->dpad = (joy->dpad | InputDefault::HAT_MASK_LEFT) & ~InputDefault::HAT_MASK_RIGHT;
} else {
joy->dpad = (joy->dpad | InputDefault::HAT_MASK_RIGHT) & ~InputDefault::HAT_MASK_LEFT;
}
} else {
joy->dpad &= ~(InputDefault::HAT_MASK_LEFT | InputDefault::HAT_MASK_RIGHT);
}
input->joy_hat(i, joy->dpad);
break;
case ABS_HAT0Y:
if (ev.value != 0) {
if (ev.value < 0) {
joy->dpad = (joy->dpad | InputDefault::HAT_MASK_UP) & ~InputDefault::HAT_MASK_DOWN;
} else {
joy->dpad = (joy->dpad | InputDefault::HAT_MASK_DOWN) & ~InputDefault::HAT_MASK_UP;
}
} else {
joy->dpad &= ~(InputDefault::HAT_MASK_UP | InputDefault::HAT_MASK_DOWN);
}
input->joy_hat(i, joy->dpad);
break;
default:
if (ev.code >= MAX_ABS) {
return;
}
if (joy->abs_map[ev.code] != -1 && joy->abs_info[ev.code]) {
float value = axis_correct(joy->abs_info[ev.code], ev.value);
joy->curr_axis[joy->abs_map[ev.code]] = value;
}
break;
}
break;
}
}
}
for (int j = 0; j < MAX_ABS; j++) {
int index = joy->abs_map[j];
if (index != -1) {
input->joy_axis(i, index, joy->curr_axis[index]);
}
}
if (len == 0 || (len < 0 && errno != EAGAIN)) {
close_joypad(i);
};
if (joy->force_feedback) {
uint64_t timestamp = input->get_joy_vibration_timestamp(i);
if (timestamp > joy->ff_effect_timestamp) {
Vector2 strength = input->get_joy_vibration_strength(i);
float duration = input->get_joy_vibration_duration(i);
if (strength.x == 0 && strength.y == 0) {
joypad_vibration_stop(i, timestamp);
} else {
joypad_vibration_start(i, strength.x, strength.y, duration, timestamp);
}
}
}
}
joy_mutex.unlock();
}
#endif
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