kernel/Documentation/ABI/testing/sysfs-class-led-trigger-usbport
.. .. @@ -8,5 +8,6 @@ 8 8 selected for the USB port trigger. Selecting ports makes trigger 9 9 observing them for any connected devices and lighting on LED if 10 10 there are any. 11 +11 12 Echoing "1" value selects USB port. Echoing "0" unselects it. 12 13 Current state can be also read.