/lib/udev/rules.d/40-joystick.rules is in joystick 1:1.4.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # Restore any stored calibration for the device
ACTION=="add", KERNEL=="js*", RUN+="/lib/udev/jscal-restore %E{DEVNAME}"
# Avoid this specific gamepad disappearing (see
# https://bugs.launchpad.net/ubuntu/+source/joystick/+bug/448446)
ACTION=="add", KERNEL=="js*", ATTRS{name}=="ACRUX USB GAMEPAD 8116", RUN+="/lib/udev/js-acrux %E{DEVNAME}"
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