linux-sg2042/Documentation/ABI/testing/sysfs-class-led-trigger-usb...

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