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#!/bin/sh
TEMP_INPUT=/sys/devices/virtual/thermal/thermal_zone0/temp
TEMP_MAX=70000
FREQ_STEP=100000
read CPU_MIN < /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq
read CPU_MAX < /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq
read GOV_MAX < /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
CPUS=`find /sys/devices/system/cpu -name "cpufreq" -type l`
set_max_freq()
{
local NEWFREQ=$1
for CPU in $CPUS
do
echo "$NEWFREQ" > "$CPU/scaling_max_freq"
done
sleep 0.1
read GOV_MAX < /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
}
while true
do
read TEMP < /sys/devices/virtual/thermal/thermal_zone0/temp
read CPU_CUR < /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq
printf "$TEMP $TEMP_MAX $CPU_MAX $GOV_MAX $CPU_CUR"
if [ "$TEMP" -lt "$TEMP_MAX" -a "$GOV_MAX" -lt "$CPU_MAX" ]
then
DIFF=$(((TEMP_MAX-TEMP)/1000))
NEWFREQ=$((GOV_MAX+(FREQ_STEP*DIFF)))
if [ "$NEWFREQ" -gt "$CPU_MAX" ]
then
NEWFREQ=$CPU_MAX
fi
printf " Increase GOV_MAX to $NEWFREQ"
set_max_freq $NEWFREQ
fi
if [ "$TEMP" -gt "$TEMP_MAX" -a "$GOV_MAX" -gt "$CPU_MIN" ]
then
DIFF=$(((TEMP-TEMP_MAX)/1000))
NEWFREQ=$((GOV_MAX-(FREQ_STEP*DIFF)))
if [ "$NEWFREQ" -lt "$CPU_MIN" ]
then
NEWFREQ=$CPU_MIN
fi
printf " Decrease GOV_MAX to $NEWFREQ"
set_max_freq $NEWFREQ
fi
echo ""
sleep 10
done
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