linux/Documentation/ABI/obsolete/sysfs-driver-hid-roccat-lua
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   1What:           /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/control
   2Date:           October 2012
   3Contact:        Stefan Achatz <erazor_de@users.sourceforge.net>
   4Description:    When written, cpi, button and light settings can be configured.
   5                When read, actual cpi setting and sensor data are returned.
   6                The data has to be 8 bytes long.
   7Users:          http://roccat.sourceforge.net
   8