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71 lines
1.8 KiB
71 lines
1.8 KiB
#!/bin/bash
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# Copyright 2018 Denes Matetelki
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# This file is part of battery_status_led.
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# battery_status_led is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License v3 as published by the Free
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# Software Foundation.
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# battery_status_led is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License v3 for
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# more details.
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# You should have received a copy of the GNU General Public License v3 along
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# with battery_status_led. If not, see
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# https://www.gnu.org/licenses/gpl-3.0.html.
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# limits in percentages
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LOW=10 # flip LED every 2s
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CRIT=5 # flip led every 0.5s
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BAT_FULL_DEV=/sys/class/power_supply/BAT0/energy_full_design
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BAT_STATUS_DEV=/sys/class/power_supply/BAT0/status
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BAT_NOW_DEV=/sys/class/power_supply/BAT0/energy_now
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CAPSLOCK_LED_DEV=/sys/class/leds/input4\:\:capslock/brightness
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# If not set by the systemd service file
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LED_DEV=${BATTERY_STATUS_LED_DEV:-$CAPSLOCK_LED_DEV}
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BAT_FULL=$(cat $BAT_FULL_DEV)
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LED=0
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while :
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do
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# If charging, sleep 1m, then restart the cycle
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STATUS=$(cat $BAT_STATUS_DEV)
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if [ $STATUS == "Charging" ] ; then
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echo 0 > $LED_DEV
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sleep 1m
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continue
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fi
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BAT_NOW=$(cat $BAT_NOW_DEV)
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BAT_PCT=$(($BAT_NOW * 100 / $BAT_FULL))
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# If battery has more than >10% left, sleep 1m then restart the cycle
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if (($BAT_PCT >= $LOW )) ; then
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sleep 1m
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continue
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fi
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# If battery is on low, but not crytical, flip LED every 2s
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if (( $BAT_PCT < $LOW )) && (( $BAT_PCT >= $CRIT)) ; then
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LED=$((1 ^ $LED))
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echo $LED > $LED_DEV
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sleep 2s
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continue
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fi
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# If battery is on crytical flip capslock LED every 0.5s
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if (( $BAT_PCT < $CRIT )) ; then
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LED=$((1 ^ $LED))
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echo $LED > $LED_DEV
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sleep 0.5s
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continue
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fi
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done
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