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