Rather than have a bunch of separate rule files for each USB HID device I’ll be using with LinuxCNC on the M2, here they are in one lump:
cat /etc/udev/rules.d/hal-input.rules
# Rules to configure input device permissions for hal_input
ATTRS{product}=="Nostromo SpeedPad2",GROUP="plugdev",MODE="0660"
ATTRS{product}=="Arduino Leonardo",GROUP="plugdev",MODE="0660"
ATTRS{product}=="Logitech Dual Action",GROUP="plugdev",MODE="0660"
The strings are case-sensitive and must match exactly. That post (among others) describes the whole dance required to get all the information.
Remember to add yourself to the plugdev group, too.
The Smell of Molten Projects in the Morning 