1What:		/sys/class/leds/<led>/ports/<port>
 2Date:		September 2016
 3KernelVersion:	4.9
 4Contact:	linux-leds@vger.kernel.org
 5		linux-usb@vger.kernel.org
 6Description:
 7		Every dir entry represents a single USB port that can be
 8		selected for the USB port trigger. Selecting ports makes trigger
 9		observing them for any connected devices and lighting on LED if
10		there are any.
11
12		Echoing "1" value selects USB port. Echoing "0" unselects it.
13		Current state can be also read.