powerd_suspend

#!/bin/sh

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

log_msg() {
    logger -t "powerd_suspend[${PPID}]" $1
}

# these files are created by powerm | powerd and there existence means
# event has occurred which should cancel suspend
suspend_cancel() {
    if [ $cancel -eq 1 ] || [ -e "/var/run/power_manager/lid_opened" ] ||
        [ -e "/var/run/power_manager/user_active" ]; then
        cancel=1
        return 0
    else
        return 1
    fi
}

cleanup_for_resume() {
    if [ $force_usb_autosuspend -eq 1 ]; then
        # disable autosuspend for USB devices if we set it before suspend.
        for i in /sys/bus/usb/devices/*/power/level; do echo on > $i; done
    fi
    rm -f "/var/run/power_manager/lid_opened"
    rm -f "/var/run/power_manager/user_active"
}

parse_args() {
    cancel=0
    if [ "$1" != "" ] ; then
        cancel=$((1 && $1))
    fi
}

log_msg "Going to suspend-to-RAM state : args=$@"
parse_args $@

# - logs the time going to suspend (no-op if no RTC).
cp /sys/class/rtc/rtc0/since_epoch /var/log/metrics/suspend-to-ram-time \
  2> /dev/null || true

# - announces the event
/usr/bin/dbus-send --type=signal --system / \
  org.chromium.PowerManager.PowerStateChanged string:mem

# - stores the current power status
power_status_on_suspend=/tmp/power-status-on-suspend
force_usb_autosuspend=0
/usr/bin/devkit-power -d \
  | /bin/grep -Eq '^[[:space:]]+online:[[:space:]]+no$'
if [ $? -eq 0 ]; then
    echo OnBattery > $power_status_on_suspend
else
    echo OnAC > $power_status_on_suspend
    if suspend_cancel; then
        log_msg "Cancel suspend at USB autosuspend"
    else
        # - enables autosuspend for USB devices. This shaves about 300ms
        #   from resume time.
        force_usb_autosuspend=1
        for i in /sys/bus/usb/devices/*/power/level; do echo auto > $i; done
    fi
fi

# - deletes hwclock snapshot from previous resumes
rm -f /tmp/hwclock-on-resume

# - suspends the cryptohome device
#CRYPTOHOME=/dev/mapper/cryptohome
#/usr/bin/test -b $CRYPTOHOME && /sbin/dmsetup suspend $CRYPTOHOME

log_msg "Explicit sync"
sync

if suspend_cancel; then
    log_msg "Cancel suspend at kernel"
else
    log_msg "Finalizing suspend"
    # - suspends to ram
    echo -n mem > /sys/power/state
fi

if [ $cancel -eq 0 ]; then
    # On resume:
    # - records the hwclock time at resume
    /sbin/hwclock --utc --debug > /tmp/hwclock-on-resume &

    # - sends UMA metrics on resume
    /usr/bin/send_metrics_on_resume &
fi

# - announces the event
/usr/bin/dbus-send --type=signal --system / \
    org.chromium.PowerManager.PowerStateChanged string:on &

cleanup_for_resume

#  - re-kicks laptop mode since AC<->Battery transition might've happened
#    while the system was suspended. Sleep a bit, though, to take care of
#    racing with USB stack coming up.
(sleep 10 && /usr/sbin/laptop_mode force) > /dev/null &

# - resumes cryptohome device
#/usr/bin/test -b $CRYPTOHOME && /sbin/dmsetup resume $CRYPTOHOME

log_msg "Resume finished"