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1What: /sys/class/leds/<led>/ports/<port>2Date: September 20163KernelVersion: 4.94Contact: linux-leds@vger.kernel.org5 linux-usb@vger.kernel.org6Description:7 Every dir entry represents a single USB port that can be8 selected for the USB port trigger. Selecting ports makes trigger9 observing them for any connected devices and lighting on LED if10 there are any.11 12 Echoing "1" value selects USB port. Echoing "0" unselects it.13 Current state can be also read.14