battery

#!/bin/bash

# max_voltage=${1:-3800}
max_voltage=3800

charging_enabled="/sys/class/power_supply/battery/charging_enabled"

log() {
   date=`date +[%Y.%m.%d\ %H:%M:%S]`
   echo "$date $1"
}

status() {
   # ctype=`cat /sys/class/power_supply/battery/charge_type`
   capacity=`cat /sys/class/power_supply/battery/capacity`
   charging=`cat $charging_enabled`
   # health=`cat /sys/class/power_supply/battery/health`
   status=`cat /sys/class/power_supply/battery/status`
   current=`cat /sys/class/power_supply/battery/current_now`
   voltage=`cat /sys/class/power_supply/battery/voltage_now`
   temp=`cat /sys/class/power_supply/battery/temp`
   echo "Capacity: $capacity # Charging: $charging # Voltage: $voltage # Current: $current # Status: $status # Temp: $temp"
}

# this is needed so charging won't be stopped from protection (/sys/class/power_supply/battery/chg_protect_status)
last_charge_update=0
pause_charge() {
   now=`date +%s`
   if (( $now < ($last_charge_update + 3600 * 9) )); then # every 9 hours
      return
   fi
   # log "Updating charge..."
   echo 0 > $charging_enabled
   sleep 9 # pause for 9 seconds (protection status check is ever 6 seconds)
   echo 1 > $charging_enabled
   last_charge_update=$now
}

update() {
   pause_charge

   voltage=`cat /sys/class/power_supply/battery/voltage_max`
   # echo $voltage

   if [[ $voltage != $max_voltage ]]; then
      log "Updating voltage_max to $max_voltage..."
      echo $max_voltage > /sys/class/power_supply/battery/voltage_max
   fi
}

monitor() {
   while true
   do
      update
      sleep 60
   done
}

case "$1" in
   update)
      update
      ;;
   monitor)
      monitor
      ;;
   *)
      status
esac