What:		For USB devices	: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
  		For BT devices	: /sys/class/bluetooth/hci<addr>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
  		Symlink		: /sys/class/hidraw/hidraw<num>/device/report_descriptor
  Date:		Jan 2011
  KernelVersion:	2.0.39
  Contact:	Alan Ott <alan@signal11.us>
  Description:	When read, this file returns the device's raw binary HID
  		report descriptor.
  		This file cannot be written.
  Users:		HIDAPI library (http://www.signal11.us/oss/hidapi)