main/hardware/powermanagement/pm-utils/files/pisilinux/99hd-apm-restore

#!/bin/bash
# vim:noexpandtab
#
#    Author: Till Maas <opensource till name>
#    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.

PATH=/sbin:/bin:/usr/sbin:/usr/bin

source "${PM_FUNCTIONS}"
source /etc/pm/config.d/hd-apm-restore.conf

HD_APM_DEVICES=""
for udi in $(hal-find-by-capability --capability storage)
do
    drive_type=$(hal-get-property --udi "${udi}" --key storage.drive_type)
    if [ "${drive_type}" == "disk" ]
    then
        HD_APM_DEVICES+="$(hal-get-property --udi "${udi}" --key block.device | sed 's,^/dev/,,') "

    fi
done

case "$1" in
	hibernate|suspend)
		for DEVICE in ${HD_APM_DEVICES}
		do
			HD_APM_FEATURE=$(hdparm -I "/dev/${DEVICE}" | grep "Advanced Power Management feature set")
			if [[ "${HD_APM_FEATURE}" != "" ]]
			then
				if (echo "${HD_APM_FEATURE}" | grep -q "*" )
				then
					HD_APM_LEVEL=$(hdparm -I "/dev/${DEVICE}" | grep "Advanced power management level" | cut -d" " -f 5)
				else
					HD_APM_LEVEL=255
				fi
				if [[ "${HD_APM_LEVEL}" != "unknown" ]]
				then
					echo "saving level ${HD_APM_LEVEL} for device ${DEVICE}"
					savestate "${DEVICE}" "${HD_APM_LEVEL}"
				else
					echo "Advanced Power Management value of device ${DEVICE} unknown"
				fi
			else
				echo "Advanced Power Management not supported by device ${DEVICE}."
			fi
		done
		;;
	thaw|resume)
		for DEVICE in ${HD_APM_DEVICES}
		do
			HD_APM_LEVEL=$(restorestate "${DEVICE}")
			if [[ "${HD_APM_LEVEL}" != "" ]]
			then
				echo "restoring level ${HD_APM_LEVEL} for device ${DEVICE}"
				hdparm -B "${HD_APM_LEVEL}" "/dev/${DEVICE}"
			fi
		done
		;;
	*)
		;;
esac

exit $?