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#include "ftnoir_tracker_linux_joystick.h"
#include <QDir>
#include <QFileInfo>
#include <QVariant>
// Discovery is done by searching for devices in the sys file system.
//
// Given a path like this
// /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.2/0003:2341:8036.0170/input/input380/js0
// we want to get this part of the string 2341:8036, it will allow us to
// identify the device in the future.
// alternative way of doing this https://stackoverflow.com/questions/21173988/linux-attempting-to-get-joystick-vendor-and-product-ids-via-ioctl-get-einval-i
std::tuple<QString, QString> sysfsDeviceToJsDev(QFileInfo device) {
using ret = std::tuple<QString, QString>;
QString symlink = device.symLinkTarget();
QString js_dev = QString("/dev/input/%1").arg(device.fileName());
QRegExp sep(QString("[:.%1]").arg(QDir::separator()));
QString device_id = symlink.section(sep, -6, -5);
return ret(js_dev, device_id);
}
QList<linux_joystick> getJoysticks()
{
char name[128];
QList<linux_joystick> joysticks;
QDir dir("/sys/class/input/");
dir.setNameFilters({ "js*" });
QFileInfoList list = dir.entryInfoList();
for (int i = 0; i < list.size(); ++i)
{
QFileInfo device = list.at(i);
auto [js_dev, device_id] = sysfsDeviceToJsDev(device);
int iFile = open(js_dev.toUtf8().data(), O_RDONLY | O_NONBLOCK);
if (iFile == -1) continue;
if (ioctl(iFile, JSIOCGNAME(sizeof(name)), &name) > 0)
{
linux_joystick j;
j.name = name;
j.dev = js_dev;
j.device_id = device_id;
joysticks.append(j);
}
close(iFile);
}
return joysticks;
}
QString getJoystickDevice(QString guid) {
QDir dir("/sys/class/input/");
dir.setNameFilters({ "js*" });
QFileInfoList list = dir.entryInfoList();
for (int i = 0; i < list.size(); ++i)
{
QFileInfo device = list.at(i);
auto [js_dev, device_id] = sysfsDeviceToJsDev(device);
if (device_id == guid) return js_dev;
}
return {};
}
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