#! /bin/sh
#
# This script adjusts hard drive APM settings using hdparm. The hardware
# defaults (usually hdparm -B 128) cause excessive head load/unload cycles
# on many modern hard drives. We therefore set hdparm -B 254 while on AC
# power. On battery we set hdparm -B 128, because the head parking is
# very useful for shock protection.
#
# Refactored from acpi-support's 90-hdparm.sh for pm-utils

# Copied from acpi-support's power-funcs to make this script independent
getState() {
        /usr/bin/on_ac_power;
        if [ "$?" -eq 0 ]; then
                STATE="AC";
        elif [ "$?" -eq 1 ]; then
                STATE="BATTERY";
        fi
}

resume_hdparm_apm()
{
	DO_HDPARM=y
	if [ -e /usr/sbin/laptop_mode ] ; then 
	  LMT_CONTROL_HD_POWERMGMT=$(. /etc/laptop-mode/laptop-mode.conf && echo "$CONTROL_HD_POWERMGMT")
	  if [ "$LMT_CONTROL_HD_POWERMGMT" != 0 ] \
		 && [ -e /var/run/laptop-mode-tools/enabled ]
	  then
		# Laptop mode controls hdparm -B settings, we don't.
		DO_HDPARM=n
	  fi
	fi

	if [ $DO_HDPARM = y ] ; then
	  # Get the power state into STATE
	  getState;
	  
	  for dev in /dev/sd? /dev/hd? ; do
		if [ -b $dev ] ; then
		  # Check for APM support; discard errors since not all drives
		  # support HDIO_GET_IDENTITY (-i).    
		  if hdparm -i $dev 2> /dev/null | grep -q 'AdvancedPM=yes' ; then
		if [ $STATE = "BATTERY" ] ; then
		  hdparm -B 128 $dev
		else
		  hdparm -B 254 $dev
		fi
		  fi
		fi
	  done
	fi
}

case "$1" in
	thaw|resume)
		resume_hdparm_apm
		;;
	*)
		exit 254
		;;
esac