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#!/bin/bash
# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Description: Read and output temperature of device's primary battery in
# degrees Celsius.
#
# TODO(tbroch) revisit for detachables with multiple batteries.
# Read battery temperature from sysfs power_supply and return in degC.
batt_temp_sysfs() {
local temp=""
for psdir in /sys/class/power_supply/* ; do
if [[ -e "${psdir}/temp" ]] ; then
pstype=$(cat $psdir/type)
if [[ "${pstype}" -eq "Battery" ]] ; then
temp=$(bc <<< "scale=2; $(cat ${psdir}/temp)/10")
break
fi
fi
done
echo ${temp}
}
# Read battery temperature from EC and return in degC.
batt_temp_ec() {
local temp=""
local sensor_str=$(ectool tempsinfo all 2>/dev/null | grep Battery)
if [[ $? -eq 0 ]] && [[ ! -z "${sensor_str}" ]] ; then
local idx=$(echo ${sensor_str} | cut -d: -f1)
# ectool temps <idx> looks like 'Reading temperature...298 K'
temp_str=$(ectool temps ${idx})
temp="${temp_str//[!0-9]/}"
if [[ -z "${temp}" ]] ; then
temp="error"
else
temp=$(bc <<< "scale=2; ${temp} - 273.15")
fi
fi
echo $temp
}
# Main
TEMP_DEGC=$(batt_temp_sysfs)
if [[ -z "${TEMP_DEGC}" ]] ; then
TEMP_DEGC=$(batt_temp_ec)
fi
if [[ -z "${TEMP_DEGC}" ]] ; then
echo "unknown"
else
echo ${TEMP_DEGC}
fi
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