#!/bin/sh

# Copyright (c) 2000-2002 Massachusetts Institute of Technology
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

set -e

# The APMD_DRIVES setting specifies the drives to be changed.  Set
# this to an empty string to disable any changes.
#APMD_DRIVES=

# The spindown timeout is set to the value of APMD_SPINDOWN when the
# computer is running on battery power.  When the computer is on AC
# power, the spindown timeout is disabled.  The number specified here
# is encoded in a complicated way.  See the man page for hdparm(8) for
# details.  For small timeouts, numbers between 1 and 240 specify
# multiples of 5 seconds.  So the default value of 18 means 18*5=90
# seconds, or 1.5 minutes.
APMD_SPINDOWN=18

HDPARM=/sbin/hdparm
[ -x "${HDPARM}" ] || exit 0

[ -n "${APMD_DRIVES}" ] || exit 0

for DRIVE in $APMD_DRIVES; do
  [ -b "${DRIVE}" ] || exit 0
done

[ "${APMD_SPINDOWN}" -gt 0 ] || exit 0

power_conserve ()
{
    # Set IDE hard disk spindown time to a short time.
    for DRIVE in $APMD_DRIVES; do
      "${HDPARM}" -q -S "${APMD_SPINDOWN}" "${DRIVE}" || true
    done
}

power_performance ()
{
    # Disable IDE hard disk spindown.
    for DRIVE in $APMD_DRIVES; do
      "${HDPARM}" -q -S 0 "${DRIVE}" || true
    done
}

choose_power ()
{
    if on_ac_power > /dev/null
    then
	power_performance
    else
	power_conserve
    fi
}

if [ "${1}" = "start" ]; then
    choose_power
elif [ "${1}" = "resume" ] && [ "${2}" != "standby" ]; then
    choose_power
elif [ "${1},${2}" = "change,power" ]; then
    choose_power
elif [ "${1}" = "stop" ]; then
    power_performance
fi

exit 0