Comment 19 for bug 390959

Here is a snip from Documentation/devices.txt

13 char Input core
    0 = /dev/input/js0 First joystick
    1 = /dev/input/js1 Second joystick
      ...
   32 = /dev/input/mouse0 First mouse
   33 = /dev/input/mouse1 Second mouse
      ...
   63 = /dev/input/mice Unified mouse
   64 = /dev/input/event0 First event queue
   65 = /dev/input/event1 Second event queue

For some reason the Microsoft Digital Media Pro Keyboard driver is requesting to be handled at a joystick. I don't know much about the area, but I will have a dig around in the code soon enough.