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// strerror_r(3)
#ifdef __clang__
# pragma clang diagnostic ignored "-Wreserved-id-macro"
# pragma clang diagnostic ignored "-Wunused-macros"
#endif
#ifndef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200112L
#endif
#include "ftnoir_protocol_libevdev.h"
#include "api/plugin-api.hpp"
#include "compat/math.hpp"
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <QDebug>
#define CHECK_LIBEVDEV(expr) \
do { \
if (int error = (expr); error != 0) \
{ \
error_code = -error; \
error_expr = #expr; \
goto fail; \
} \
} while (false)
static constexpr int max_input = 1 << 16;
static constexpr int mid_input = (1 << 15) - 1;
static constexpr int min_input = 0;
evdev::evdev()
{
dev = libevdev_new();
if (!dev)
{
error_code = errno;
error_expr = "libevdev_new();";
goto fail;
}
CHECK_LIBEVDEV(libevdev_enable_property(dev, INPUT_PROP_BUTTONPAD));
libevdev_set_name(dev, "opentrack headpose");
struct input_absinfo absinfo;
absinfo.minimum = min_input;
absinfo.maximum = max_input;
absinfo.resolution = 1;
absinfo.value = mid_input;
absinfo.flat = 1;
absinfo.fuzz = 0;
CHECK_LIBEVDEV(libevdev_enable_event_type(dev, EV_ABS));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_X, &absinfo));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Y, &absinfo));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_Z, &absinfo));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RX, &absinfo));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RY, &absinfo));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_ABS, ABS_RZ, &absinfo));
/* do not remove next 3 lines or udev scripts won't assign 0664 permissions -sh */
CHECK_LIBEVDEV(libevdev_enable_event_type(dev, EV_KEY));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_KEY, BTN_JOYSTICK, NULL));
CHECK_LIBEVDEV(libevdev_enable_event_code(dev, EV_KEY, BTN_TRIGGER, NULL));
CHECK_LIBEVDEV(libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev));
return;
fail:
if (uidev)
libevdev_uinput_destroy(uidev);
if (dev)
libevdev_free(dev);
qDebug() << "libevdev error" << error_code;
uidev = nullptr;
dev = nullptr;
}
evdev::~evdev()
{
if (uidev)
libevdev_uinput_destroy(uidev);
if (dev)
libevdev_free(dev);
}
void evdev::pose(const double* headpose, const double*) {
static const int axes[] = {
/* translation goes first */
ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ
};
static const int max_value[] = {
100,
100,
100,
180,
90,
180
};
for (int i = 0; i < 6; i++)
{
int value = (int)(headpose[i] * mid_input / max_value[i] + mid_input);
int normalized = std::clamp(value, min_input, max_input);
(void) libevdev_uinput_write_event(uidev, EV_ABS, axes[i], normalized);
}
(void) libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0);
}
module_status evdev::initialize()
{
if (error_code)
{
const char* msg;
char buf[128] {};
if (!(msg = strerror_r(error_code, buf, sizeof(buf))))
{
snprintf(buf, sizeof(buf), "%d", error_code);
msg = buf;
}
return error(QStringLiteral("libevdev call '%1' failed with error '%2'")
.arg(!error_expr ? "<NULL>" : error_expr, msg));
}
else
return {};
}
OPENTRACK_DECLARE_PROTOCOL(evdev, LibevdevControls, evdevDll)
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