| 1 | #!/bin/bash |
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| 2 | # |
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| 3 | # Simple script implementing a temperature dependent fan speed control |
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| 4 | # Supported Linux kernel versions: 2.6.5 and later |
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| 5 | # |
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| 6 | # Version 0.68 |
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| 7 | # |
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| 8 | # Usage: fancontrol [CONFIGFILE] |
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| 9 | # |
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| 10 | # Dependencies: |
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| 11 | # bash, egrep, sed, cut, sleep, lm_sensors :) |
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| 12 | # |
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| 13 | # Please send any questions, comments or success stories to |
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| 14 | # marius.reiner@hdev.de |
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| 15 | # Thanks! |
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| 16 | # |
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| 17 | # For configuration instructions and warnings please see fancontrol.txt, which |
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| 18 | # can be found in the doc/ directory or at the website mentioned above. |
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| 19 | # |
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| 20 | # |
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| 21 | # Copyright 2003 Marius Reiner <marius.reiner@hdev.de> |
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| 22 | # Copyright (C) 2007-2009 Jean Delvare <khali@linux-fr.org> |
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| 23 | # |
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| 24 | # This program is free software; you can redistribute it and/or modify |
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| 25 | # it under the terms of the GNU General Public License as published by |
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| 26 | # the Free Software Foundation; either version 2 of the License, or |
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| 27 | # (at your option) any later version. |
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| 28 | # |
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| 29 | # This program is distributed in the hope that it will be useful, |
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| 30 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 31 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 32 | # GNU General Public License for more details. |
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| 33 | # |
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| 34 | # You should have received a copy of the GNU General Public License |
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| 35 | # along with this program; if not, write to the Free Software |
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| 36 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
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| 37 | # MA 02110-1301 USA. |
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| 38 | # |
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| 39 | # |
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| 40 | |
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| 41 | PIDFILE="/var/run/fancontrol.pid" |
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| 42 | |
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| 43 | #DEBUG=1 |
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| 44 | MAX=255 |
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| 45 | |
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| 46 | declare -i pwmval |
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| 47 | |
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| 48 | function LoadConfig { |
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| 49 | echo "Loading configuration from $1 ..." |
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| 50 | if [ ! -r "$1" ] |
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| 51 | then |
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| 52 | echo "Error: Can't read configuration file" |
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| 53 | exit 1 |
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| 54 | fi |
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| 55 | |
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| 56 | # grep configuration from file |
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| 57 | INTERVAL=`egrep '^INTERVAL=.*$' $1 | sed -e 's/INTERVAL=//g'` |
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| 58 | FCTEMPS=`egrep '^FCTEMPS=.*$' $1 | sed -e 's/FCTEMPS=//g'` |
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| 59 | MINTEMP=`egrep '^MINTEMP=.*$' $1 | sed -e 's/MINTEMP=//g'` |
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| 60 | MAXTEMP=`egrep '^MAXTEMP=.*$' $1 | sed -e 's/MAXTEMP=//g'` |
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| 61 | MINSTART=`egrep '^MINSTART=.*$' $1 | sed -e 's/MINSTART=//g'` |
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| 62 | MINSTOP=`egrep '^MINSTOP=.*$' $1 | sed -e 's/MINSTOP=//g'` |
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| 63 | # optional settings: |
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| 64 | FCFANS=`egrep '^FCFANS=.*$' $1 | sed -e 's/FCFANS=//g'` |
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| 65 | MINPWM=`egrep '^MINPWM=.*$' $1 | sed -e 's/MINPWM=//g'` |
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| 66 | MAXPWM=`egrep '^MAXPWM=.*$' $1 | sed -e 's/MAXPWM=//g'` |
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| 67 | |
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| 68 | # Check whether all mandatory settings are set |
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| 69 | if [[ -z ${INTERVAL} || -z ${FCTEMPS} || -z ${MINTEMP} || -z ${MAXTEMP} || -z ${MINSTART} || -z ${MINSTOP} ]] |
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| 70 | then |
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| 71 | echo "Some mandatory settings missing, please check your config file!" |
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| 72 | exit 1 |
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| 73 | fi |
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| 74 | if [ "$INTERVAL" -le 0 ] |
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| 75 | then |
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| 76 | echo "Error in configuration file:" |
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| 77 | echo "INTERVAL must be at least 1" |
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| 78 | exit 1 |
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| 79 | fi |
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| 80 | |
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| 81 | # write settings to arrays for easier use and print them |
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| 82 | echo |
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| 83 | echo "Common settings:" |
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| 84 | echo " INTERVAL=$INTERVAL" |
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| 85 | |
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| 86 | let fcvcount=0 |
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| 87 | for fcv in $FCTEMPS |
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| 88 | do |
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| 89 | if ! echo $fcv | egrep -q '=' |
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| 90 | then |
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| 91 | echo "Error in configuration file:" |
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| 92 | echo "FCTEMPS value is improperly formatted" |
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| 93 | exit 1 |
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| 94 | fi |
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| 95 | |
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| 96 | AFCPWM[$fcvcount]=`echo $fcv |cut -d'=' -f1` |
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| 97 | AFCTEMP[$fcvcount]=`echo $fcv |cut -d'=' -f2` |
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| 98 | AFCFAN[$fcvcount]=`echo $FCFANS |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 99 | AFCMINTEMP[$fcvcount]=`echo $MINTEMP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 100 | AFCMAXTEMP[$fcvcount]=`echo $MAXTEMP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 101 | AFCMINSTART[$fcvcount]=`echo $MINSTART |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 102 | AFCMINSTOP[$fcvcount]=`echo $MINSTOP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 103 | AFCMINPWM[$fcvcount]=`echo $MINPWM |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 104 | [ -z "${AFCMINPWM[$fcvcount]}" ] && AFCMINPWM[$fcvcount]=0 |
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| 105 | AFCMAXPWM[$fcvcount]=`echo $MAXPWM |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 106 | [ -z "${AFCMAXPWM[$fcvcount]}" ] && AFCMAXPWM[$fcvcount]=255 |
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| 107 | |
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| 108 | # verify the validity of the settings |
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| 109 | if [ "${AFCMINTEMP[$fcvcount]}" -ge "${AFCMAXTEMP[$fcvcount]}" ] |
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| 110 | then |
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| 111 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" |
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| 112 | echo "MINTEMP must be less than MAXTEMP" |
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| 113 | exit 1 |
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| 114 | fi |
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| 115 | if [ "${AFCMAXPWM[$fcvcount]}" -gt 255 ] |
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| 116 | then |
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| 117 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" |
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| 118 | echo "MAXPWM must be at most 255" |
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| 119 | exit 1 |
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| 120 | fi |
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| 121 | if [ "${AFCMINSTOP[$fcvcount]}" -ge "${AFCMAXPWM[$fcvcount]}" ] |
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| 122 | then |
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| 123 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" |
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| 124 | echo "MINSTOP must be less than MAXPWM" |
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| 125 | exit 1 |
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| 126 | fi |
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| 127 | if [ "${AFCMINSTOP[$fcvcount]}" -lt "${AFCMINPWM[$fcvcount]}" ] |
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| 128 | then |
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| 129 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" |
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| 130 | echo "MINSTOP must be greater than or equal to MINPWM" |
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| 131 | exit 1 |
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| 132 | fi |
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| 133 | if [ "${AFCMINPWM[$fcvcount]}" -lt 0 ] |
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| 134 | then |
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| 135 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" |
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| 136 | echo "MINPWM must be at least 0" |
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| 137 | exit 1 |
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| 138 | fi |
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| 139 | |
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| 140 | echo |
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| 141 | echo "Settings for ${AFCPWM[$fcvcount]}:" |
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| 142 | echo " Depends on ${AFCTEMP[$fcvcount]}" |
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| 143 | echo " Controls ${AFCFAN[$fcvcount]}" |
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| 144 | echo " MINTEMP=${AFCMINTEMP[$fcvcount]}" |
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| 145 | echo " MAXTEMP=${AFCMAXTEMP[$fcvcount]}" |
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| 146 | echo " MINSTART=${AFCMINSTART[$fcvcount]}" |
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| 147 | echo " MINSTOP=${AFCMINSTOP[$fcvcount]}" |
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| 148 | echo " MINPWM=${AFCMINPWM[$fcvcount]}" |
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| 149 | echo " MAXPWM=${AFCMAXPWM[$fcvcount]}" |
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| 150 | let fcvcount=fcvcount+1 |
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| 151 | done |
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| 152 | echo |
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| 153 | } |
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| 154 | |
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| 155 | if [ -f "$1" ] |
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| 156 | then |
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| 157 | LoadConfig $1 |
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| 158 | else |
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| 159 | LoadConfig /etc/fancontrol |
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| 160 | fi |
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| 161 | |
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| 162 | # Detect if config file uses the hwmon class or not yet |
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| 163 | if echo "${AFCPWM[0]}" | egrep -q '^hwmon[0-9]' |
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| 164 | then |
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| 165 | DIR=/sys/class/hwmon |
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| 166 | else |
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| 167 | DIR=/sys/bus/i2c/devices |
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| 168 | fi |
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| 169 | |
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| 170 | if [ ! -d $DIR ] |
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| 171 | then |
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| 172 | echo $0: 'No sensors found! (did you load the necessary modules?)' |
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| 173 | exit 1 |
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| 174 | fi |
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| 175 | cd $DIR |
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| 176 | |
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| 177 | if [ -f "$PIDFILE" ] |
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| 178 | then |
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| 179 | echo "File $PIDFILE exists, is fancontrol already running?" |
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| 180 | exit 1 |
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| 181 | fi |
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| 182 | echo $$ > "$PIDFILE" |
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| 183 | |
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| 184 | # $1 = pwm file name |
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| 185 | function pwmdisable() |
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| 186 | { |
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| 187 | ENABLE=${1}_enable |
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| 188 | # No enable file? Just set to max |
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| 189 | if [ ! -f $ENABLE ] |
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| 190 | then |
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| 191 | echo $MAX > $1 |
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| 192 | return 0 |
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| 193 | fi |
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| 194 | |
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| 195 | # Try pwmN_enable=0 |
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| 196 | echo 0 > $ENABLE 2> /dev/null |
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| 197 | if [ `cat $ENABLE` -eq 0 ] |
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| 198 | then |
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| 199 | # Success |
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| 200 | return 0 |
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| 201 | fi |
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| 202 | |
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| 203 | # It didn't work, try pwmN_enable=1 pwmN=255 |
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| 204 | echo 1 > $ENABLE 2> /dev/null |
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| 205 | echo $MAX > $1 |
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| 206 | if [ `cat $ENABLE` -eq 1 -a `cat $1` -ge 190 ] |
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| 207 | then |
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| 208 | # Success |
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| 209 | return 0 |
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| 210 | fi |
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| 211 | |
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| 212 | # Nothing worked |
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| 213 | echo "$ENABLE stuck to" `cat $ENABLE` >&2 |
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| 214 | return 1 |
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| 215 | } |
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| 216 | |
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| 217 | # $1 = pwm file name |
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| 218 | function pwmenable() |
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| 219 | { |
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| 220 | ENABLE=${1}_enable |
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| 221 | if [ -f $ENABLE ] |
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| 222 | then |
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| 223 | echo 1 > $ENABLE 2> /dev/null |
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| 224 | if [ $? -ne 0 ] |
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| 225 | then |
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| 226 | return 1 |
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| 227 | fi |
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| 228 | fi |
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| 229 | echo $MAX > $1 |
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| 230 | } |
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| 231 | |
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| 232 | function restorefans() |
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| 233 | { |
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| 234 | local status=$1 |
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| 235 | echo 'Aborting, restoring fans...' |
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| 236 | let fcvcount=0 |
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| 237 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 238 | do |
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| 239 | pwmo=${AFCPWM[$fcvcount]} |
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| 240 | pwmdisable $pwmo |
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| 241 | let fcvcount=$fcvcount+1 |
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| 242 | done |
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| 243 | echo 'Verify fans have returned to full speed' |
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| 244 | rm -f "$PIDFILE" |
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| 245 | exit $status |
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| 246 | } |
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| 247 | |
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| 248 | trap 'restorefans 0' SIGQUIT SIGTERM |
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| 249 | trap 'restorefans 1' SIGHUP SIGINT |
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| 250 | |
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| 251 | # main function |
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| 252 | function UpdateFanSpeeds { |
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| 253 | let fcvcount=0 |
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| 254 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 255 | do |
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| 256 | #hopefully shorter vars will improve readability: |
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| 257 | pwmo=${AFCPWM[$fcvcount]} |
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| 258 | tsens=${AFCTEMP[$fcvcount]} |
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| 259 | fan=${AFCFAN[$fcvcount]} |
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| 260 | let mint="${AFCMINTEMP[$fcvcount]}*1000" |
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| 261 | let maxt="${AFCMAXTEMP[$fcvcount]}*1000" |
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| 262 | minsa=${AFCMINSTART[$fcvcount]} |
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| 263 | minso=${AFCMINSTOP[$fcvcount]} |
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| 264 | minpwm=${AFCMINPWM[$fcvcount]} |
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| 265 | maxpwm=${AFCMAXPWM[$fcvcount]} |
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| 266 | |
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| 267 | read tval < ${tsens} |
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| 268 | if [ $? -ne 0 ] |
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| 269 | then |
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| 270 | echo "Error reading temperature from $DIR/$tsens" |
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| 271 | restorefans 1 |
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| 272 | fi |
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| 273 | |
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| 274 | read pwmpval < ${pwmo} |
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| 275 | if [ $? -ne 0 ] |
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| 276 | then |
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| 277 | echo "Error reading PWM value from $DIR/$pwmo" |
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| 278 | restorefans 1 |
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| 279 | fi |
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| 280 | |
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| 281 | # If fanspeed-sensor output shall be used, do it |
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| 282 | if [[ -n ${fan} ]] |
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| 283 | then |
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| 284 | read fanval < ${fan} |
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| 285 | if [ $? -ne 0 ] |
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| 286 | then |
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| 287 | echo "Error reading Fan value from $DIR/$fan" |
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| 288 | restorefans 1 |
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| 289 | fi |
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| 290 | else |
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| 291 | fanval=1 # set it to a non zero value, so the rest of the script still works |
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| 292 | fi |
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| 293 | |
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| 294 | # debug info |
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| 295 | if [ "$DEBUG" != "" ] |
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| 296 | then |
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| 297 | echo "pwmo=$pwmo" |
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| 298 | echo "tsens=$tsens" |
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| 299 | echo "fan=$fan" |
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| 300 | echo "mint=$mint" |
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| 301 | echo "maxt=$maxt" |
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| 302 | echo "minsa=$minsa" |
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| 303 | echo "minso=$minso" |
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| 304 | echo "minpwm=$minpwm" |
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| 305 | echo "maxpwm=$maxpwm" |
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| 306 | echo "tval=$tval" |
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| 307 | echo "pwmpval=$pwmpval" |
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| 308 | echo "fanval=$fanval" |
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| 309 | fi |
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| 310 | |
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| 311 | if (( $tval <= $mint )) |
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| 312 | then pwmval=$minpwm # below min temp, use defined min pwm |
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| 313 | elif (( $tval >= $maxt )) |
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| 314 | then pwmval=$maxpwm # over max temp, use defined max pwm |
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| 315 | else |
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| 316 | # calculate the new value from temperature and settings |
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| 317 | pwmval="(${tval}-${mint})*(${maxpwm}-${minso})/(${maxt}-${mint})+${minso}" |
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| 318 | if [ $pwmpval -eq 0 -o $fanval -eq 0 ] |
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| 319 | then # if fan was stopped start it using a safe value |
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| 320 | echo $minsa > $pwmo |
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| 321 | # Sleep while still handling signals |
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| 322 | sleep 1 & |
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| 323 | wait $! |
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| 324 | fi |
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| 325 | fi |
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| 326 | echo $pwmval > $pwmo # write new value to pwm output |
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| 327 | if [ $? -ne 0 ] |
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| 328 | then |
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| 329 | echo "Error writing PWM value to $DIR/$pwmo" |
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| 330 | restorefans 1 |
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| 331 | fi |
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| 332 | if [ "$DEBUG" != "" ] |
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| 333 | then |
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| 334 | echo "new pwmval=$pwmval" |
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| 335 | fi |
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| 336 | let fcvcount=$fcvcount+1 |
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| 337 | done |
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| 338 | } |
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| 339 | |
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| 340 | echo 'Enabling PWM on fans...' |
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| 341 | let fcvcount=0 |
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| 342 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 343 | do |
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| 344 | pwmo=${AFCPWM[$fcvcount]} |
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| 345 | pwmenable $pwmo |
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| 346 | if [ $? -ne 0 ] |
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| 347 | then |
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| 348 | echo "Error enabling PWM on $DIR/$pwmo" |
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| 349 | restorefans 1 |
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| 350 | fi |
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| 351 | let fcvcount=$fcvcount+1 |
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| 352 | done |
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| 353 | |
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| 354 | echo 'Starting automatic fan control...' |
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| 355 | |
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| 356 | # main loop calling the main function at specified intervals |
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| 357 | while true |
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| 358 | do |
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| 359 | UpdateFanSpeeds |
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| 360 | # Sleep while still handling signals |
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| 361 | sleep $INTERVAL & |
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| 362 | wait $! |
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| 363 | done |
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