788cb74cc6
udev doesn't work in sandboxes, notably the new Steam container runtime as found notably on the Steam Deck, and in Flatpak/Snap packages. Like SDL does, when we detect such a containerized environment, we fall back to parsing `/dev/input` directly. See smcv's comments in #76879 for details. Fixes #76879.
596 lines
18 KiB
C++
596 lines
18 KiB
C++
/**************************************************************************/
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/* joypad_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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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 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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#ifdef JOYDEV_ENABLED
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#include "joypad_linux.h"
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#include "core/os/os.h"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <unistd.h>
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#ifdef UDEV_ENABLED
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#ifdef SOWRAP_ENABLED
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#include "libudev-so_wrap.h"
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#else
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#include <libudev.h>
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#endif
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#endif
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#define LONG_BITS (sizeof(long) * 8)
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#define test_bit(nr, addr) (((1UL << ((nr) % LONG_BITS)) & ((addr)[(nr) / LONG_BITS])) != 0)
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#define NBITS(x) ((((x)-1) / LONG_BITS) + 1)
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#ifdef UDEV_ENABLED
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static const char *ignore_str = "/dev/input/js";
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#endif
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JoypadLinux::Joypad::~Joypad() {
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for (int i = 0; i < MAX_ABS; i++) {
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if (abs_info[i]) {
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memdelete(abs_info[i]);
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}
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}
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}
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void JoypadLinux::Joypad::reset() {
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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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curr_axis[i] = 0;
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}
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events.clear();
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}
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// This function is derived from SDL:
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// https://github.com/libsdl-org/SDL/blob/main/src/core/linux/SDL_sandbox.c#L28-L45
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static bool detect_sandbox() {
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if (access("/.flatpak-info", F_OK) == 0) {
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return true;
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}
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// For Snap, we check multiple variables because they might be set for
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// unrelated reasons. This is the same thing WebKitGTK does.
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if (OS::get_singleton()->has_environment("SNAP") && OS::get_singleton()->has_environment("SNAP_NAME") && OS::get_singleton()->has_environment("SNAP_REVISION")) {
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return true;
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}
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if (access("/run/host/container-manager", F_OK) == 0) {
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return true;
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}
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return false;
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}
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JoypadLinux::JoypadLinux(Input *in) {
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#ifdef UDEV_ENABLED
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#ifdef SOWRAP_ENABLED
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#ifdef DEBUG_ENABLED
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int dylibloader_verbose = 1;
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#else
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int dylibloader_verbose = 0;
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#endif
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if (detect_sandbox()) {
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// Linux binaries in sandboxes / containers need special handling because
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// libudev doesn't work there. So we need to fallback to manual parsing
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// of /dev/input in such case.
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use_udev = false;
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print_verbose("JoypadLinux: udev enabled, but detected incompatible sandboxed mode. Falling back to /dev/input to detect joypads.");
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} else {
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use_udev = initialize_libudev(dylibloader_verbose) == 0;
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if (use_udev) {
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if (!udev_new || !udev_unref || !udev_enumerate_new || !udev_enumerate_add_match_subsystem || !udev_enumerate_scan_devices || !udev_enumerate_get_list_entry || !udev_list_entry_get_next || !udev_list_entry_get_name || !udev_device_new_from_syspath || !udev_device_get_devnode || !udev_device_get_action || !udev_device_unref || !udev_enumerate_unref || !udev_monitor_new_from_netlink || !udev_monitor_filter_add_match_subsystem_devtype || !udev_monitor_enable_receiving || !udev_monitor_get_fd || !udev_monitor_receive_device || !udev_monitor_unref) {
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// There's no API to check version, check if functions are available instead.
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use_udev = false;
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print_verbose("JoypadLinux: Unsupported udev library version!");
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} else {
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print_verbose("JoypadLinux: udev enabled and loaded successfully.");
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}
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} else {
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print_verbose("JoypadLinux: udev enabled, but couldn't be loaded. Falling back to /dev/input to detect joypads.");
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}
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}
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#endif
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#else
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print_verbose("JoypadLinux: udev disabled, parsing /dev/input to detect joypads.");
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#endif
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input = in;
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monitor_joypads_thread.start(monitor_joypads_thread_func, this);
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joypad_events_thread.start(joypad_events_thread_func, this);
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}
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JoypadLinux::~JoypadLinux() {
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monitor_joypads_exit.set();
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joypad_events_exit.set();
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monitor_joypads_thread.wait_to_finish();
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joypad_events_thread.wait_to_finish();
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close_joypads();
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}
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void JoypadLinux::monitor_joypads_thread_func(void *p_user) {
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if (p_user) {
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JoypadLinux *joy = static_cast<JoypadLinux *>(p_user);
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joy->monitor_joypads_thread_run();
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}
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}
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void JoypadLinux::monitor_joypads_thread_run() {
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#ifdef UDEV_ENABLED
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if (use_udev) {
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udev *_udev = udev_new();
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if (!_udev) {
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use_udev = false;
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ERR_PRINT("Failed getting an udev context, falling back to parsing /dev/input.");
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monitor_joypads();
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} else {
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enumerate_joypads(_udev);
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monitor_joypads(_udev);
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udev_unref(_udev);
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}
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} else {
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monitor_joypads();
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}
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#else
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monitor_joypads();
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#endif
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}
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#ifdef UDEV_ENABLED
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void JoypadLinux::enumerate_joypads(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_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) {
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String devnode_str = devnode;
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if (devnode_str.find(ignore_str) == -1) {
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open_joypad(devnode);
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}
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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 JoypadLinux::monitor_joypads(udev *p_udev) {
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udev_device *dev = nullptr;
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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", nullptr);
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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 (!monitor_joypads_exit.is_set()) {
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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, nullptr, nullptr, &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) != nullptr) {
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String action = udev_device_get_action(dev);
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const char *devnode = udev_device_get_devnode(dev);
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if (devnode) {
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String devnode_str = devnode;
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if (devnode_str.find(ignore_str) == -1) {
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if (action == "add") {
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open_joypad(devnode);
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} else if (String(action) == "remove") {
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close_joypad(devnode);
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}
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}
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}
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udev_device_unref(dev);
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}
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}
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usleep(50000);
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}
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udev_monitor_unref(mon);
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}
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#endif
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void JoypadLinux::monitor_joypads() {
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while (!monitor_joypads_exit.is_set()) {
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DIR *input_directory;
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input_directory = opendir("/dev/input");
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if (input_directory) {
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struct dirent *current;
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char fname[64];
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while ((current = readdir(input_directory)) != nullptr) {
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if (strncmp(current->d_name, "event", 5) != 0) {
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continue;
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}
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sprintf(fname, "/dev/input/%.*s", 16, current->d_name);
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if (attached_devices.find(fname) == -1) {
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open_joypad(fname);
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}
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}
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}
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closedir(input_directory);
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usleep(1000000); // 1s
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}
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}
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void JoypadLinux::close_joypads() {
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for (int i = 0; i < JOYPADS_MAX; i++) {
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MutexLock lock(joypads_mutex[i]);
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Joypad &joypad = joypads[i];
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close_joypad(joypad, i);
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}
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}
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void JoypadLinux::close_joypad(const char *p_devpath) {
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for (int i = 0; i < JOYPADS_MAX; i++) {
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MutexLock lock(joypads_mutex[i]);
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Joypad &joypad = joypads[i];
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if (joypads[i].devpath == p_devpath) {
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close_joypad(joypad, i);
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}
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}
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}
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void JoypadLinux::close_joypad(Joypad &p_joypad, int p_id) {
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if (p_joypad.fd != -1) {
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close(p_joypad.fd);
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p_joypad.fd = -1;
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attached_devices.erase(p_joypad.devpath);
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input->joy_connection_changed(p_id, false, "");
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}
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p_joypad.events.clear();
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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 JoypadLinux::setup_joypad_properties(Joypad &p_joypad) {
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unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
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unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
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int num_buttons = 0;
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int num_axes = 0;
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if ((ioctl(p_joypad.fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(p_joypad.fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
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return;
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}
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for (int i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
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if (test_bit(i, keybit)) {
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p_joypad.key_map[i] = 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 (test_bit(i, keybit)) {
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p_joypad.key_map[i] = 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 (test_bit(i, absbit)) {
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p_joypad.abs_map[i] = num_axes++;
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p_joypad.abs_info[i] = memnew(input_absinfo);
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if (ioctl(p_joypad.fd, EVIOCGABS(i), p_joypad.abs_info[i]) < 0) {
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memdelete(p_joypad.abs_info[i]);
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p_joypad.abs_info[i] = nullptr;
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}
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}
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}
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p_joypad.force_feedback = false;
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p_joypad.ff_effect_timestamp = 0;
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unsigned long ffbit[NBITS(FF_CNT)];
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if (ioctl(p_joypad.fd, EVIOCGBIT(EV_FF, sizeof(ffbit)), ffbit) != -1) {
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if (test_bit(FF_RUMBLE, ffbit)) {
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p_joypad.force_feedback = true;
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}
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}
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}
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void JoypadLinux::open_joypad(const char *p_path) {
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int joy_num = input->get_unused_joy_id();
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int fd = open(p_path, O_RDWR | O_NONBLOCK);
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if (fd != -1 && joy_num != -1) {
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unsigned long evbit[NBITS(EV_MAX)] = { 0 };
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unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
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unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
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// add to attached devices so we don't try to open it again
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attached_devices.push_back(String(p_path));
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if ((ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
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close(fd);
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return;
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}
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// Check if the device supports basic gamepad events
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bool has_abs_left = (test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit));
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bool has_abs_right = (test_bit(ABS_RX, absbit) && test_bit(ABS_RY, absbit));
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if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) && (has_abs_left || has_abs_right))) {
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close(fd);
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return;
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}
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char uid[128];
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char namebuf[128];
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String name = "";
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input_id inpid;
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if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) >= 0) {
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name = namebuf;
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}
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if (ioctl(fd, EVIOCGID, &inpid) < 0) {
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close(fd);
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return;
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}
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MutexLock lock(joypads_mutex[joy_num]);
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Joypad &joypad = joypads[joy_num];
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joypad.reset();
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joypad.fd = fd;
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joypad.devpath = String(p_path);
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setup_joypad_properties(joypad);
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sprintf(uid, "%04x%04x", BSWAP16(inpid.bustype), 0);
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if (inpid.vendor && inpid.product && inpid.version) {
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uint16_t vendor = BSWAP16(inpid.vendor);
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uint16_t product = BSWAP16(inpid.product);
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uint16_t version = BSWAP16(inpid.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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} 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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}
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void JoypadLinux::joypad_vibration_start(Joypad &p_joypad, float p_weak_magnitude, float p_strong_magnitude, float p_duration, uint64_t p_timestamp) {
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if (!p_joypad.force_feedback || p_joypad.fd == -1 || p_weak_magnitude < 0.f || p_weak_magnitude > 1.f || p_strong_magnitude < 0.f || p_strong_magnitude > 1.f) {
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return;
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}
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if (p_joypad.ff_effect_id != -1) {
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joypad_vibration_stop(p_joypad, p_timestamp);
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}
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struct ff_effect effect;
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effect.type = FF_RUMBLE;
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effect.id = -1;
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effect.u.rumble.weak_magnitude = floor(p_weak_magnitude * (float)0xffff);
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effect.u.rumble.strong_magnitude = floor(p_strong_magnitude * (float)0xffff);
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effect.replay.length = floor(p_duration * 1000);
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effect.replay.delay = 0;
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if (ioctl(p_joypad.fd, EVIOCSFF, &effect) < 0) {
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return;
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}
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struct input_event play;
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play.type = EV_FF;
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play.code = effect.id;
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play.value = 1;
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if (write(p_joypad.fd, (const void *)&play, sizeof(play)) == -1) {
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print_verbose("Couldn't write to Joypad device.");
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}
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p_joypad.ff_effect_id = effect.id;
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p_joypad.ff_effect_timestamp = p_timestamp;
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}
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void JoypadLinux::joypad_vibration_stop(Joypad &p_joypad, uint64_t p_timestamp) {
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if (!p_joypad.force_feedback || p_joypad.fd == -1 || p_joypad.ff_effect_id == -1) {
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return;
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}
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if (ioctl(p_joypad.fd, EVIOCRMFF, p_joypad.ff_effect_id) < 0) {
|
|
return;
|
|
}
|
|
|
|
p_joypad.ff_effect_id = -1;
|
|
p_joypad.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::joypad_events_thread_func(void *p_user) {
|
|
if (p_user) {
|
|
JoypadLinux *joy = (JoypadLinux *)p_user;
|
|
joy->joypad_events_thread_run();
|
|
}
|
|
}
|
|
|
|
void JoypadLinux::joypad_events_thread_run() {
|
|
while (!joypad_events_exit.is_set()) {
|
|
bool no_events = true;
|
|
for (int i = 0; i < JOYPADS_MAX; i++) {
|
|
MutexLock lock(joypads_mutex[i]);
|
|
Joypad &joypad = joypads[i];
|
|
if (joypad.fd == -1) {
|
|
continue;
|
|
}
|
|
input_event event;
|
|
while (read(joypad.fd, &event, sizeof(event)) > 0) {
|
|
no_events = false;
|
|
JoypadEvent joypad_event;
|
|
joypad_event.type = event.type;
|
|
joypad_event.code = event.code;
|
|
joypad_event.value = event.value;
|
|
joypad.events.push_back(joypad_event);
|
|
}
|
|
if (errno != EAGAIN) {
|
|
close_joypad(joypad, i);
|
|
}
|
|
}
|
|
if (no_events) {
|
|
usleep(10000); // 10ms
|
|
}
|
|
}
|
|
}
|
|
|
|
void JoypadLinux::process_joypads() {
|
|
for (int i = 0; i < JOYPADS_MAX; i++) {
|
|
MutexLock lock(joypads_mutex[i]);
|
|
Joypad &joypad = joypads[i];
|
|
if (joypad.fd == -1) {
|
|
continue;
|
|
}
|
|
for (uint32_t j = 0; j < joypad.events.size(); j++) {
|
|
const JoypadEvent &joypad_event = joypad.events[j];
|
|
// joypad_event may be tainted and out of MAX_KEY range, which will cause
|
|
// joypad.key_map[joypad_event.code] to crash
|
|
if (joypad_event.code >= MAX_KEY) {
|
|
return;
|
|
}
|
|
|
|
switch (joypad_event.type) {
|
|
case EV_KEY:
|
|
input->joy_button(i, (JoyButton)joypad.key_map[joypad_event.code], joypad_event.value);
|
|
break;
|
|
|
|
case EV_ABS:
|
|
switch (joypad_event.code) {
|
|
case ABS_HAT0X:
|
|
if (joypad_event.value != 0) {
|
|
if (joypad_event.value < 0) {
|
|
joypad.dpad.set_flag(HatMask::LEFT);
|
|
joypad.dpad.clear_flag(HatMask::RIGHT);
|
|
} else {
|
|
joypad.dpad.set_flag(HatMask::RIGHT);
|
|
joypad.dpad.clear_flag(HatMask::LEFT);
|
|
}
|
|
} else {
|
|
joypad.dpad.clear_flag(HatMask::LEFT);
|
|
joypad.dpad.clear_flag(HatMask::RIGHT);
|
|
}
|
|
input->joy_hat(i, joypad.dpad);
|
|
break;
|
|
|
|
case ABS_HAT0Y:
|
|
if (joypad_event.value != 0) {
|
|
if (joypad_event.value < 0) {
|
|
joypad.dpad.set_flag(HatMask::UP);
|
|
joypad.dpad.clear_flag(HatMask::DOWN);
|
|
} else {
|
|
joypad.dpad.set_flag(HatMask::DOWN);
|
|
joypad.dpad.clear_flag(HatMask::UP);
|
|
}
|
|
} else {
|
|
joypad.dpad.clear_flag(HatMask::UP);
|
|
joypad.dpad.clear_flag(HatMask::DOWN);
|
|
}
|
|
input->joy_hat(i, joypad.dpad);
|
|
break;
|
|
|
|
default:
|
|
if (joypad_event.code >= MAX_ABS) {
|
|
return;
|
|
}
|
|
if (joypad.abs_map[joypad_event.code] != -1 && joypad.abs_info[joypad_event.code]) {
|
|
float value = axis_correct(joypad.abs_info[joypad_event.code], joypad_event.value);
|
|
joypad.curr_axis[joypad.abs_map[joypad_event.code]] = value;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
joypad.events.clear();
|
|
|
|
for (int j = 0; j < MAX_ABS; j++) {
|
|
int index = joypad.abs_map[j];
|
|
if (index != -1) {
|
|
input->joy_axis(i, (JoyAxis)index, joypad.curr_axis[index]);
|
|
}
|
|
}
|
|
|
|
if (joypad.force_feedback) {
|
|
uint64_t timestamp = input->get_joy_vibration_timestamp(i);
|
|
if (timestamp > joypad.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(joypad, timestamp);
|
|
} else {
|
|
joypad_vibration_start(joypad, strength.x, strength.y, duration, timestamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif // JOYDEV_ENABLED
|