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ev3-tacho-rpmsg
  /sys/class/leds/led0{-1}:red{green}:brick-status/brightness

lego-ev3-touch
  /sys/class/lego-sensor/sensor0/value0 (0/1)

lego-ev3-color
  /sys/class/lego-sensor/sensor1/mode{-s, value0{-2}}

lego-ev3-ir
  /sys/class/lego-sensor/sensor2/mode{-s, value0{-7}}
  100% proximity is ~70 cm
  <http://docs.ev3dev.org/projects/lego-linux-drivers/en/ev3dev-stretch/sensor_data.html>

motors (max speed: 1050)
  /sys/class/tacho-motor/motor0{-2} # commands: run-direct{timed,forever}
  $ cat lego-ev3-l-motor # large                run-to-abs{rel}-pos
                                                run-to-rel-pos
                                                stop reset (dash?)
  stop_action: coast (default) · brake · hold