release/src/router/apcupsd/examples/offbattery.cpufreq

   1 #!/bin/sh
   2 #
   3 # This shell script if placed in /etc/apcupsd will be
   4 # called by /etc/apcupsd/apccontrol when the UPS goes
   5 # back on to the mains after a power failure.
   6 #
   7 # We scale the CPU clock frequency to maximum and
   8 # send an email message to root to notify him.
   9 #
  10 # NOTE: Assumes Linux-2.6.x kernel with CPUFREQ
  11 # support for your chipset.
  12 SYSADMIN=root
  13 APCUPSD_MAIL="/bin/mail"
  14
  15 # Iterate over all CPUs, enabling the userspace governor
  16 # and programming the current clock speed to the maximum.
  17 # This is redundant on hyperthread siblings, but it
  18 # doesn't hurt anything and it keeps the code simple.
  19 for CPU in /sys/devices/system/cpu/cpu*/cpufreq ; do
  20         echo -n userspace > $CPU/scaling_governor
  21         cat $CPU/scaling_max_freq > $CPU/scaling_setspeed
  22 done
  23
  24 # Send an email to root
  25 HOSTNAME=`hostname`
  26 MSG="$HOSTNAME Power has returned"
  27 #
  28 (
  29    echo "Subject: $MSG"
  30    echo " "
  31    echo "$MSG"
  32    echo " "
  33    for CPU in `ls -1 /sys/devices/system/cpu` ; do
  34       echo -n "$CPU freq scaled to "
  35       cat /sys/devices/system/cpu/$CPU/cpufreq/scaling_setspeed | tr -d '\n'
  36       echo " MHz"
  37    done
  38    echo " "
  39    /sbin/apcaccess status
  40 ) | $APCUPSD_MAIL -s "$MSG" $SYSADMIN
  41 exit 0
  42