112 lines
2.9 KiB
Bash
Executable File
112 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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#===============================================================================
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#
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# suspend
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#
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# Copyright (C) 2009-2013 by Digi International Inc.
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# All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 as published by
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# the Free Software Foundation.
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#
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#
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# !Description: suspend system to RAM
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#
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#===============================================================================
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scriptname="$(basename ${0})"
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syspower="/sys/power/state"
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usage() {
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printf "\nSuspend system to RAM memory\n"
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printf "\nUsage: ${scriptname} [OPTIONS]\n
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-h Show this help
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\n"
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}
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suspend_system_time() {
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if [ "$(echo /sys/class/rtc/rtc*)" != "/sys/class/rtc/rtc*" ]; then
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hwclock -w
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fi
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}
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suspend_interfaces() {
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# 'wlan0' interface on some platforms (ccwmx5xjs, cwme9210, ccardwmx28js)
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# has problems on suspend-resume, so we workaround it by bringing the
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# interface down before suspend and bring it up again after resume.
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# (#35777, #40082)
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if grep -qs 'wlan0' /proc/net/dev; then
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if grep -qs '^wlan0' /var/run/ifstate; then
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ifdown wlan0 && up_wlan_on_resume="1"
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fi
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fi
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}
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resume_storage_devices() {
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# remove disk devices and run coldplug mdev to scan for nodes in
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# case any device was plugged while the system was suspended
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rm -f /dev/sd[a-z] /dev/mmcblk[0-9] && mdev -s
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# for partition nodes fire hotplug ADD event or umount file system
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# in case the real hardware is not present
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for i in /dev/sd[a-z][0-9]* /dev/mmcblk[0-9]p[0-9]*; do
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[ "${i}" = "/dev/sd[a-z][0-9]*" ] && continue
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[ "${i}" = "/dev/mmcblk[0-9]p[0-9]*" ] && continue
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dev_path=$(ls -d /sys/block/*/${i#/dev/} 2>/dev/null)
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if [ -f "${dev_path}/uevent" ]; then
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printf "add" > ${dev_path}/uevent
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else
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if grep -q "${i}[[:blank:]]" /proc/mounts; then
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mdir=$(sed -ne "s,${i}[[:blank:]]\+\([^[:blank:]]\+\)[[:blank:]].*,\1,g;T;p" /proc/mounts)
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umount "${mdir}"
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rmdir -- "${mdir}" 2>/dev/null
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rm -f "${i}"
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fi
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fi
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done
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}
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resume_interfaces() {
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# 'wlan0' interface on some platforms (ccwmx5xjs, cwme9210, ccardwmx28js)
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# has problems on suspend-resume, so we workaround it by bringing the
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# interface down before suspend and bring it up again after resume.
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# (#35777, #40082)
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if grep -qs 'wlan0' /proc/net/dev; then
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if ! grep -qs '^wlan0' /var/run/ifstate; then
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[ -n "${up_wlan_on_resume}" ] && ifup wlan0
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fi
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fi
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}
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resume_system_time() {
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if [ "$(echo /sys/class/rtc/rtc*)" != "/sys/class/rtc/rtc*" ]; then
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hwclock -s
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fi
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}
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while getopts "h" c; do
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case "${c}" in
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h) usage; exit;;
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esac
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done
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if [ -f "${syspower}" ]; then
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# Pre-suspend actions
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suspend_system_time
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suspend_interfaces
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# Suspend the device
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printf "mem" > ${syspower}
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sleep .5
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# Post-resume actions
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resume_storage_devices
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resume_interfaces
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resume_system_time
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else
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printf "\n[ERROR] File ${syspower} not found\n\n"
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fi
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