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#!/bin/sh
THRESH_START_PATH="/sys/class/power_supply/BAT0/charge_control_start_threshold"
THRESH_STOP_PATH="/sys/class/power_supply/BAT0/charge_control_end_threshold"
TLP_DROP_IN="/etc/tlp.d/05-bat-thresh.conf"
DOCKED_START=75
DOCKED_STOP=87
DEFAULT_START=96
DEFAULT_STOP=100
usage() {
cat <<EOF
usage: $(basename "$0") [OPTION]
toggles BAT0 charge thresholds between docked and default modes,
writing or removing a persistent TLP drop-in at ${TLP_DROP_IN}.
options:
-h, --help show this help message and exit
modes:
docked START_CHARGE_THRESH_BAT0=${DOCKED_START} STOP_CHARGE_THRESH_BAT0=${DOCKED_STOP}
default START_CHARGE_THRESH_BAT0=${DEFAULT_START} STOP_CHARGE_THRESH_BAT0=${DEFAULT_STOP}
EOF
}
case "${1}" in
-h|--help) usage; exit 0 ;;
esac
# gotta be root to write to sysfs
if [ "$(id -u)" -ne 0 ]; then
usage
sleep 1
echo "error: script must be run as root."; echo ""
exit 1
fi
# make sure the sysfs nodes are actually there
[ -f "$THRESH_START_PATH" ] || { echo "error: $THRESH_START_PATH not found — is thinkpad_acpi loaded?"; exit 1; }
[ -f "$THRESH_STOP_PATH" ] || { echo "error: $THRESH_STOP_PATH not found — is thinkpad_acpi loaded?"; exit 1; }
current_stop=$(cat "$THRESH_STOP_PATH")
# determine which mode to switch INTO based on the current stop threshold
case "$current_stop" in
"$DOCKED_STOP")
target_mode="default"
new_start="$DEFAULT_START"
new_stop="$DEFAULT_STOP"
;;
*)
target_mode="docked"
new_start="$DOCKED_START"
new_stop="$DOCKED_STOP"
;;
esac
# the kernel enforces start < stop at all times, so write order matters
case "$target_mode" in
default)
printf "%s" "$new_stop" > "$THRESH_STOP_PATH" || { echo "error: failed to write stop threshold."; exit 1; }
printf "%s" "$new_start" > "$THRESH_START_PATH" || { echo "error: failed to write start threshold."; exit 1; }
;;
docked)
printf "%s" "$new_start" > "$THRESH_START_PATH" || { echo "error: failed to write start threshold."; exit 1; }
printf "%s" "$new_stop" > "$THRESH_STOP_PATH" || { echo "error: failed to write stop threshold."; exit 1; }
;;
esac
echo "switched to $target_mode mode — start: ${new_start}% stop: ${new_stop}%"
# write or remove drop-in so thresholds survive a reboot; no sed fragility
if [ -d "/etc/tlp.d" ]; then
case "$target_mode" in
docked)
printf '# managed by bat-thresh-toggle — do not edit by hand\nSTART_CHARGE_THRESH_BAT0=%s\nSTOP_CHARGE_THRESH_BAT0=%s\n' \
"$new_start" "$new_stop" > "$TLP_DROP_IN" \
&& echo "${TLP_DROP_IN} written" \
|| echo "error: failed to write ${TLP_DROP_IN}."
;;
default)
if [ -f "$TLP_DROP_IN" ]; then
rm "$TLP_DROP_IN" \
&& echo "${TLP_DROP_IN} removed — TLP will use its built-in defaults after reboot." \
|| echo "error: failed to remove ${TLP_DROP_IN}."
fi
;;
esac
else
echo "note: /etc/tlp.d not found - sysfs write is not persistent across reboots."
fi
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