GunCon 2 USB Lightgun Driver

Linux driver for the GunCon 2 light gun.

The device reports absolute ABS_X and ABS_Y positions, the trigger button is reported as BTN_LEFT. The ABS_X and ABS_Y position reported by the device are raw values from the GunCon 2.

This branch is modified and uses keyboard keys instead of gamepad buttons and D-Pad

1 is the Guncon2 Start button

5 is the Guncon2 Select button

Keyboard D-Pad is the Guncon2 D-Pad

Left Shift is the Guncon2 C button

Left mouse button is the Guncon2 trigger

Right mouse button is the Guncon2 A Button

Middle mouse button is the Guncon2 B button

Calibration

The GunCon 2 will need to be calibrated for your display.

The min and max values for ABS_X and ABS_Y can be changed by updating the calibration information using evdev-joystick.

For example calibrate the X and Y axis:

# X axis
evdev-joystick --e /dev/input/by-id/usb-0b9a_016a-event-joystick -m 175 -M 720 -a 0
# Y axis
evdev-joystick --e /dev/input/by-id/usb-0b9a_016a-event-joystick -m 20 -M 240 -a 1

I have also included a simple script for calibrating the GunCon 2, however the calibration must be perform each time the GunCon 2 is connected. This can be done with a set of udev rules.

For example;

SUBSYSTEM=="input", ATTRS{idVendor}=="0b9a", ATTRS{idProduct}=="016a", ACTION=="add", RUN+="/bin/bash -c 'evdev-joystick --e %E{DEVNAME} -m 175 -M 720 -a 0; evdev-joystick --e %E{DEVNAME} -m 20 -M 240 -a 1'"

Build and install

make modules
sudo make modules_install
sudo depmod -a
sudo modprobe guncon2

To reload after compiling you will first need to unload it using sudo modprobe -r guncon2.