beardypig / guncon2

Linux driver for the Guncon 2 light gun

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.

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.

guncon2's Issues

Only one Guncon working when 2 are connected, and neither listed by evdev-joystick --listdevs

Hi! Thank you for this module! I was successfully able to compile and modprobe it in order to use my Guncon 2 as an input device when playing Point Blank under Retropie when connected to a CRT display, which I thought was incredible!

However, I'm having two problems using this driver for an actual multiplayer game -- one is that Retropie seems to only map a single Guncon for both players no matter what I do, and I think this is tied to problem 2: my Guncons aren't being listed as joysticks by either evdev or by Retropie, so I can't configure or calibrate them very effectively, and I don't actually know how Retropie is accessing them otherwise.

I think they might be being recognized as mice, currently?

pi@retropie:/dev/input/by-path $ ls
platform-3f980000.usb-usb-0:1.1.2:1.0-event-mouse     platform-3f980000.usb-usb-0:1.1.3:1.0-joystick
platform-3f980000.usb-usb-0:1.1.2:1.0-mouse           platform-3f980000.usb-usb-0:1.3:1.0-event-mouse
platform-3f980000.usb-usb-0:1.1.3:1.0-event-joystick  platform-3f980000.usb-usb-0:1.3:1.0-mouse

Help would be appreciated!

nice work - need some direction :)

hi - I'm running groovyarcade through a New Astro City and recently added a Ps2 Guncon2 into the mix.

I installed your drivers - and I'm pretty sure that side of things is 100%. The gun fires and buttons work on it in game. However the mouse/crosshair is erratic all over the screen. I ran the calibration - however it didn't work, I don't see usb-0b9a_016a-event-joystick but I do see usb-0b9a_016a-event-mouse. Even with that change, still no change to the guns behaviour.

finally - I do not have the sync cable attached, I was unsure from the guide - is this required in this setup ? I'm running VGA > extron > RGB BNC > Dsub15 arcade monitor. So I would assume if required - I would put a T connection into the BNCs and join in from there.

[Contribution] Add more guns

Hi, I have a gun that works well in pc, but I want to use your drivers in rpi. I think it works equal as guncon2, but because of vendor and product ids, it is not being detected by your drivers.

I will try to compile changing these values, but, how do you think about using a config file to set these values? Or using an array of vendor-poduct ids tuplas?

I'm not used to C language, but I think adding my devices ids to guncon2_table should work, isn't it?

Something like that:

static const struct usb_device_id guncon2_table[] = {
        {USB_DEVICE(NAMCO_VENDOR_ID, GUNCON2_PRODUCT_ID)},
        {USB_DEVICE(MY_VENDOR_ID, MY_PRODUCT_ID)},
        {}};

Cheers

Progress

Have you had any more thoughts on this? I'm still available for testing :)

Mouse calibration

As of now the calibration only supports the gun in Joystick mode.
Request for mouse calibration

[Feature Request] Is 31khz support possible?

It would be nice to be able to use this driver with a 31khz VGA connection on a CRT monitor, especially for dreamcast lightgun games or 31khz arcade games. I'm aware I'd have to make a VGA sync combiner breakout to make this work with a PC CRT monitor. With that in mind, is 31khz support possible, or planned?