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#!/usr/bin/env bash
set -eo pipefail
DEFAULT_START_THRESHOLD=75
DEFAULT_STOP_THRESHOLD=85
BAT_DIR=/sys/class/power_supply/BAT0
START_FILE="$BAT_DIR/charge_start_threshold"
STOP_FILE="$BAT_DIR/charge_stop_threshold"
setcharge()
{
start=$1
stop=$2
cur_start=$(cat "$START_FILE")
cur_stop=$(cat "$STOP_FILE")
if ((cur_stop > stop)); then
echo "$start" | sudo tee "$START_FILE" >/dev/null
echo "$stop" | sudo tee "$STOP_FILE" >/dev/null
else
echo "$stop" | sudo tee "$STOP_FILE" >/dev/null
echo "$start" | sudo tee "$START_FILE" >/dev/null
fi
echo "Charging set:"
echo " start=$start"
echo " stop=$stop"
}
cmd=$1
shift || true
case "$cmd" in
show)
start=$(cat "$START_FILE")
stop=$(cat "$STOP_FILE")
echo "Current thresholds:"
echo " start=$start"
echo " stop=$stop"
;;
set)
start=${1:-$DEFAULT_START_THRESHOLD}
stop=${2:-$DEFAULT_STOP_THRESHOLD}
setcharge "$start" "$stop"
;;
fullcharge)
start=95
stop=100
echo "Fullcharge. Keep AC on!"
setcharge "$start" "$stop"
;;
*)
echo "Usage: $0 {show|set [start=$DEFAULT_START_THRESHOLD] [stop=$DEFAULT_STOP_THRESHOLD]|fullcharge}" >&2
exit 1
;;
esac
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