tree d273573088617578dcf1ed841a8eeca608be0ef1
parent 713b2c1c247aca61a08df150ff15653cd01f5091
author Jan Kundrát <jan.kundrat@cesnet.cz> 1531826680 +0200
committer Jan Kundrát <jan.kundrat@cesnet.cz> 1531826680 +0200

Prepare for LED triggers in response to line-in loss-of-signal

The EDFA's signal is available on a GPIO, and the `gpio` trigger
supports shared pin access in this context. Here's roughly how to enable
it:

  # cd /sys/class/leds/$SOMETHING
  # echo gpio > trigger
  # echo 490 > gpio
  # echo 1 > inverted

Change-Id: I5bd24af2ea5eff22020dcf87b5ac33e2cc9ae8da