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godot/platform/x11/joystick_linux.cpp

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/*************************************************************************/
/* joystick_linux.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
/* */
/* 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. */
/*************************************************************************/
//author: Andreas Haas <hondres, liugam3@gmail.com>
#ifdef JOYDEV_ENABLED
#include "joystick_linux.h"
#include "print_string.h"
#include <libevdev/libevdev.h>
#include <libudev.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <cstring>
static const char* ignore_str = "/dev/input/js";
joystick_linux::Joystick::Joystick() {
fd = -1;
dpad = 0;
dev = NULL;
devpath = "";
}
void joystick_linux::Joystick::reset() {
dpad = 0;
fd = -1;
for (int i=0; i < MAX_ABS; i++) {
abs_map[i] = -1;
}
}
joystick_linux::joystick_linux(InputDefault *in)
{
exit_udev = false;
input = in;
joy_mutex = Mutex::create();
joy_thread = Thread::create(joy_thread_func, this);
}
joystick_linux::~joystick_linux() {
exit_udev = true;
Thread::wait_to_finish(joy_thread);
close_joystick();
}
void joystick_linux::joy_thread_func(void *p_user) {
if (p_user) {
joystick_linux* joy = (joystick_linux*) p_user;
joy->run_joystick_thread();
}
return;
}
void joystick_linux::run_joystick_thread() {
udev *_udev = udev_new();
ERR_FAIL_COND(!_udev);
enumerate_joysticks(_udev);
monitor_joysticks(_udev);
udev_unref(_udev);
}
void joystick_linux::enumerate_joysticks(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_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
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 != NULL && strstr(devnode, ignore_str) == NULL) {
joy_mutex->lock();
open_joystick(devnode);
joy_mutex->unlock();
}
udev_device_unref(dev);
}
udev_enumerate_unref(enumerate);
}
void joystick_linux::monitor_joysticks(udev *p_udev) {
udev_device *dev = NULL;
udev_monitor *mon = udev_monitor_new_from_netlink(p_udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "input", NULL);
udev_monitor_enable_receiving(mon);
int fd = udev_monitor_get_fd(mon);
while (!exit_udev) {
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, NULL, NULL, &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) != 0) {
joy_mutex->lock();
const char* action = udev_device_get_action(dev);
const char* devnode = udev_device_get_devnode(dev);
if (strstr(devnode, ignore_str) == NULL) {
if (strcmp(action, "add") == 0)
open_joystick(devnode);
else if (strcmp(action, "remove") == 0)
close_joystick(get_joy_from_path(devnode));
}
udev_device_unref(dev);
joy_mutex->unlock();
}
}
usleep(50000);
}
//printf("exit udev\n");
udev_monitor_unref(mon);
}
int joystick_linux::get_free_joy_slot() const {
for (int i = 0; i < JOYSTICKS_MAX; i++) {
if (joysticks[i].fd == -1) return i;
}
return -1;
}
int joystick_linux::get_joy_from_path(String p_path) const {
for (int i = 0; i < JOYSTICKS_MAX; i++) {
if (joysticks[i].devpath == p_path) {
return i;
}
}
return -2;
}
void joystick_linux::close_joystick(int p_id) {
if (p_id == -1) {
for (int i=0; i<JOYSTICKS_MAX; i++) {
close_joystick(i);
};
return;
}
else if (p_id < 0) return;
Joystick &joy = joysticks[p_id];
if (joy.fd != -1) {
libevdev_free(joy.dev);
close(joy.fd);
joy.fd = -1;
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 joystick_linux::setup_joystick_properties(int p_id) {
Joystick* joy = &joysticks[p_id];
libevdev* dev = joy->dev;
int num_buttons = 0;
int num_axes = 0;
for (int i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
if (libevdev_has_event_code(dev, EV_KEY, i)) {
joy->key_map[i] = num_buttons++;
}
}
for (int i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
if (libevdev_has_event_code(dev, EV_KEY, i)) {
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 (libevdev_has_event_code(dev, EV_ABS, i)) {
joy->abs_map[i] = num_axes++;
}
}
}
void joystick_linux::open_joystick(const char *p_path) {
int joy_num = get_free_joy_slot();
int fd = open(p_path, O_RDONLY | O_NONBLOCK);
if (fd != -1 && joy_num != -1) {
int rc = libevdev_new_from_fd(fd, &joysticks[joy_num].dev);
if (rc < 0) {
fprintf(stderr, "Failed to init libevdev (%s)\n", strerror(-rc));
return;
}
libevdev *dev = joysticks[joy_num].dev;
//check if the device supports basic gamepad events, prevents certain keyboards from
//being detected as joysticks
if (libevdev_has_event_type(dev, EV_ABS) && libevdev_has_event_type(dev, EV_KEY) &&
(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))) {
char uid[128];
String name = libevdev_get_name(dev);
uint16_t bus = __bswap_16(libevdev_get_id_bustype(dev));
uint16_t vendor = __bswap_16(libevdev_get_id_vendor(dev));
uint16_t product = __bswap_16(libevdev_get_id_product(dev));
uint16_t version = __bswap_16(libevdev_get_id_version(dev));
joysticks[joy_num].reset();
Joystick &joy = joysticks[joy_num];
joy.fd = fd;
joy.devpath = String(p_path);
setup_joystick_properties(joy_num);
sprintf(uid, "%04x%04x", bus, 0);
if (vendor && product && 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);
}
}
else {
//device is not a gamepad, clean up
libevdev_free(dev);
close(fd);
}
}
}
InputDefault::JoyAxis joystick_linux::axis_correct(const input_absinfo *p_abs, int p_value) const {
int min = p_abs->minimum;
int max = p_abs->maximum;
InputDefault::JoyAxis jx;
if (min < 0) {
jx.min = -1;
if (p_value < 0) {
jx.value = (float) -p_value / min;
}
jx.value = (float) p_value / max;
}
if (min == 0) {
jx.min = 0;
jx.value = 0.0f + (float) p_value / max;
}
return jx;
}
uint32_t joystick_linux::process_joysticks(uint32_t p_event_id) {
if (joy_mutex->try_lock() != OK) {
return p_event_id;
}
for (int i=0; i<JOYSTICKS_MAX; i++) {
if (joysticks[i].fd == -1) continue;
input_event ev;
Joystick* joy = &joysticks[i];
libevdev* dev = joy->dev;
int rc = 1;
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
if (rc < 0 && rc != -EAGAIN) {
continue;
}
while (rc == LIBEVDEV_READ_STATUS_SYNC || rc == LIBEVDEV_READ_STATUS_SUCCESS) {
switch (ev.type) {
case EV_KEY:
p_event_id = input->joy_button(p_event_id, 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 |= InputDefault::HAT_MASK_LEFT;
else joy->dpad |= InputDefault::HAT_MASK_RIGHT;
}
else joy->dpad &= ~(InputDefault::HAT_MASK_LEFT | InputDefault::HAT_MASK_RIGHT);
p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
break;
case ABS_HAT0Y:
if (ev.value != 0) {
if (ev.value < 0) joy->dpad |= InputDefault::HAT_MASK_UP;
else joy->dpad |= InputDefault::HAT_MASK_DOWN;
}
else joy->dpad &= ~(InputDefault::HAT_MASK_UP | InputDefault::HAT_MASK_DOWN);
p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
break;
default:
if (joy->abs_map[ev.code] != -1) {
InputDefault::JoyAxis value = axis_correct(libevdev_get_abs_info(dev, ev.code), ev.value);
p_event_id = input->joy_axis(p_event_id, i, joy->abs_map[ev.code], value);
}
break;
}
break;
}
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
}
}
joy_mutex->unlock();
return p_event_id;
}
#endif
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