What:		/sys/class/input/input(x)/device/startup
Date:		March 2014
Contact:	Carlo Caione <carlo@caione.org>
Description:	Startup time in us. Board is powered on if the button is pressed
		for more than <startup_time>

What:		/sys/class/input/input(x)/device/shutdown
Date:		March 2014
Contact:	Carlo Caione <carlo@caione.org>
Description:	Shutdown time in us. Board is powered off if the button is pressed
		for more than <shutdown_time>