# version 0.5 - 20080120
# A temperature daemon to help for a cooler MacBookPro 3.1
# Now also changes the power saving mode for the HD depending on
# on/off-line mode.
# Author nick barcet nickNOSPAM AT barcet DOT com

                   ### W A R N I N G ###

# No guaranty whatsoever that it will do good to your computer.
# You can blame yourself for installing this if your processor
# decides to die tomorrow

do_init()
{
        # I'm pretty happy with the following  values but feel free to
        # play with them.  Just keep an eye on the values return by the sensors
        # package.
        # We set different value for on and off line, as we don't care
        # about saving power when on-line.
        #~ if (cat /proc/acpi/ac_adapter/ADP1/state | grep on-line > /dev/null); then
                # We are online, be pretty cool
                [ $debug -eq 1 ] && echo "state:                   on-line"
                MIN=475 # temp in degree celsius x 10
                MAX=680
                let "RATIO = 5500 / ($MAX - $MIN)"
                #no need for much hd power saving when on-line
                #~ hdparm -B 200 /dev/sda
        #~ else
                #~ [ $debug -eq 1 ] && echo "state:                   off-line"
                #~ MIN=510 # temp in degree celsius x 10
                #~ MAX=590
                #~ let "RATIO = 5500 / ($MAX - $MIN)"
                #~ #be more agressive on hd power-savings when off-line
                #~ hdparm -B 50 /dev/sda
        #~ fi
        let "TARGET = ( ($MAX - $MIN)/3 ) + $MIN"
#       let "HIGH = ( ($MAX - $MIN)/3 ) + $TARGET"
}

get_temp()
{
        TEMP1=`cat /sys/devices/platform/applesmc.768/temp1_input`
        TEMP2=`cat /sys/devices/platform/applesmc.768/temp2_input`
        #~ TEMP3=`cat /sys/devices/platform/applesmc.768/temp3_input`
        #~ TEMP4=`cat /sys/devices/platform/applesmc.768/temp4_input`
        let "TEMP = ($TEMP1 + $TEMP2)/ 200"
}

debug=0
do_init
count=1
maxtempcount=0

while [ true ]; do

        get_temp

        [ $debug -eq 1 ] && echo "average temp: $TEMP (target: $TARGET, max: $MAX)"

        let "SPEED = ($TEMP - $MIN) * $RATIO"

        # Just to make sur we do not set fan >5500 or <0
        if [ $SPEED -gt 5500 ]; then
                SPEED=5500
        elif [ $SPEED -lt 1 ]; then
                SPEED=1
        elif [ $TEMP -lt $TARGET ]; then
                #let autoregulation work (if it does)
                SPEED=1
        fi

        [ $debug -eq 1 ] && echo "set fan speed to: $SPEED (step: $RATIO)"
        #~ echo $SPEED > /sys/devices/platform/applesmc.768/fan2_min
        echo $SPEED > /sys/devices/platform/applesmc.768/fan1_min

        if [ $TEMP -gt $MAX ]; then
                [ $debug -eq 1 ] && echo "temp: $TEMP > max: $MAX"
                let "maxtempcount = $maxtempcount + 1"
                if [ $maxtempcount -gt 3 ]; then
                        while [ $TEMP -gt $TARGET ]; do
                                [ $debug -eq 1 ] && echo "Force fan speed to: 5500 until temp ($TEMP) = $TARGET"
                                #~ echo 5500 > /sys/devices/platform/applesmc.768/fan2_min
                                echo 5500 > /sys/devices/platform/applesmc.768/fan1_min
                                sleep 10
                                get_temp
                                let "count = $count + 2"
                        done
                        maxtempcount=0
                else
                        sleep 5
                        let "count = $count+1"
                fi
        elif [ $SPEED -lt 2 ]; then
                # Sleep longer when autoregulating
                sleep 20
                let "count = $count+4"
        else
                sleep 5
                let "count = $count+1"
        fi

        if [ $count -gt 10 ]; then
                count=0
                do_init
        fi
done