sailtrack-x708_pwr

#!/bin/bash

# `sailtrack-x708_pwr` - Shell script that performs a software shutdown or reboot depending on an impulse coming from
# the Geekworm X708 power HAT. This is needed to perform a full shutdown or reboot using a physical power button (the
# HAT sends the signal to this script, which performs the software shutdown/reboot, and then the HAT cuts the power).

shutdown_pin=5
boot_pin=12
reboot_pulse_min_ms=200
reboot_pulse_max_ms=600

# Set pin directions (input/output) and default values
echo $shutdown_pin > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio$shutdown_pin/direction
echo $boot_pin > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio$boot_pin/direction
echo "1" > /sys/class/gpio/gpio$boot_pin/value

while : ; do
  signal=$(</sys/class/gpio/gpio$shutdown_pin/value)
  # While the button is not pressed, do nothing
  if [ "$signal" = 0 ]; then /bin/sleep 0.2
  else
    start=$(date +%s%N | cut -b1-13)
    while [ "$signal" = 1 ]; do
      /bin/sleep 0.02
      # If the button is pressed for more than `$reboot_pulse_max_ms`, power off
      if [ $(($(date +%s%N | cut -b1-13)-"$start")) -gt $reboot_pulse_max_ms ]; then
        sudo /usr/sbin/poweroff
        exit
      fi
      signal=$(</sys/class/gpio/gpio$shutdown_pin/value)
    done
    # If the button is pressed for more than `$reboot_pulse_min_ms`, reboot
    if [ $(($(date +%s%N | cut -b1-13)-"$start")) -gt $reboot_pulse_min_ms ]; then
      sudo /usr/sbin/reboot
      exit
    fi
  fi
done