This minimal USB gamepad driver uses the Usb session to access the USB
device and provides Genode's Input service to its client. There is no
support for any fancy features like rumble support or, if available,
battery state checking. Furthermore there is currently no way to
calibrate the analog input sources, which leads to unexpected motion
events due to input jitter.
For a list of supported devices and more information please look at the
README.
Fixes#58.
c96a5d2016