| 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 0.70 |
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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, readlink, 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 "$1" ] |
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| 51 | then |
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| 52 | echo "Error: Can't read configuration file" >&2 |
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| 53 | exit 1 |
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| 54 | fi |
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| 55 | |
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| 56 | # grep configuration from file |
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| 57 | INTERVAL=`egrep '^INTERVAL=.*$' $1 | sed -e 's/INTERVAL=//g'` |
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| 58 | DEVPATH=`egrep '^DEVPATH=.*$' $1 | sed -e 's/DEVPATH= *//g'` |
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| 59 | DEVNAME=`egrep '^DEVNAME=.*$' $1 | sed -e 's/DEVNAME= *//g'` |
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| 60 | FCTEMPS=`egrep '^FCTEMPS=.*$' $1 | sed -e 's/FCTEMPS=//g'` |
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| 61 | MINTEMP=`egrep '^MINTEMP=.*$' $1 | sed -e 's/MINTEMP=//g'` |
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| 62 | MAXTEMP=`egrep '^MAXTEMP=.*$' $1 | sed -e 's/MAXTEMP=//g'` |
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| 63 | MINSTART=`egrep '^MINSTART=.*$' $1 | sed -e 's/MINSTART=//g'` |
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| 64 | MINSTOP=`egrep '^MINSTOP=.*$' $1 | sed -e 's/MINSTOP=//g'` |
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| 65 | # optional settings: |
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| 66 | FCFANS=`egrep '^FCFANS=.*$' $1 | sed -e 's/FCFANS=//g'` |
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| 67 | MINPWM=`egrep '^MINPWM=.*$' $1 | sed -e 's/MINPWM=//g'` |
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| 68 | MAXPWM=`egrep '^MAXPWM=.*$' $1 | sed -e 's/MAXPWM=//g'` |
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| 69 | |
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| 70 | # Check whether all mandatory settings are set |
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| 71 | if [[ -z ${INTERVAL} || -z ${FCTEMPS} || -z ${MINTEMP} || -z ${MAXTEMP} || -z ${MINSTART} || -z ${MINSTOP} ]] |
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| 72 | then |
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| 73 | echo "Some mandatory settings missing, please check your config file!" >&2 |
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| 74 | exit 1 |
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| 75 | fi |
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| 76 | if [ "$INTERVAL" -le 0 ] |
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| 77 | then |
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| 78 | echo "Error in configuration file:" >&2 |
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| 79 | echo "INTERVAL must be at least 1" >&2 |
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| 80 | exit 1 |
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| 81 | fi |
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| 82 | |
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| 83 | # write settings to arrays for easier use and print them |
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| 84 | echo |
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| 85 | echo "Common settings:" |
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| 86 | echo " INTERVAL=$INTERVAL" |
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| 87 | |
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| 88 | let fcvcount=0 |
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| 89 | for fcv in $FCTEMPS |
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| 90 | do |
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| 91 | if ! echo $fcv | egrep -q '=' |
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| 92 | then |
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| 93 | echo "Error in configuration file:" >&2 |
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| 94 | echo "FCTEMPS value is improperly formatted" >&2 |
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| 95 | exit 1 |
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| 96 | fi |
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| 97 | |
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| 98 | AFCPWM[$fcvcount]=`echo $fcv |cut -d'=' -f1` |
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| 99 | AFCTEMP[$fcvcount]=`echo $fcv |cut -d'=' -f2` |
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| 100 | AFCFAN[$fcvcount]=`echo $FCFANS |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 101 | AFCMINTEMP[$fcvcount]=`echo $MINTEMP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 102 | AFCMAXTEMP[$fcvcount]=`echo $MAXTEMP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 103 | AFCMINSTART[$fcvcount]=`echo $MINSTART |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 104 | AFCMINSTOP[$fcvcount]=`echo $MINSTOP |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 105 | AFCMINPWM[$fcvcount]=`echo $MINPWM |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 106 | [ -z "${AFCMINPWM[$fcvcount]}" ] && AFCMINPWM[$fcvcount]=0 |
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| 107 | AFCMAXPWM[$fcvcount]=`echo $MAXPWM |sed -e 's/ /\n/g' |egrep "${AFCPWM[$fcvcount]}" |cut -d'=' -f2` |
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| 108 | [ -z "${AFCMAXPWM[$fcvcount]}" ] && AFCMAXPWM[$fcvcount]=255 |
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| 109 | |
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| 110 | # verify the validity of the settings |
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| 111 | if [ "${AFCMINTEMP[$fcvcount]}" -ge "${AFCMAXTEMP[$fcvcount]}" ] |
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| 112 | then |
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| 113 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" >&2 |
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| 114 | echo "MINTEMP must be less than MAXTEMP" >&2 |
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| 115 | exit 1 |
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| 116 | fi |
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| 117 | if [ "${AFCMAXPWM[$fcvcount]}" -gt 255 ] |
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| 118 | then |
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| 119 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" >&2 |
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| 120 | echo "MAXPWM must be at most 255" >&2 |
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| 121 | exit 1 |
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| 122 | fi |
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| 123 | if [ "${AFCMINSTOP[$fcvcount]}" -ge "${AFCMAXPWM[$fcvcount]}" ] |
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| 124 | then |
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| 125 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" >&2 |
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| 126 | echo "MINSTOP must be less than MAXPWM" >&2 |
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| 127 | exit 1 |
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| 128 | fi |
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| 129 | if [ "${AFCMINSTOP[$fcvcount]}" -lt "${AFCMINPWM[$fcvcount]}" ] |
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| 130 | then |
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| 131 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" >&2 |
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| 132 | echo "MINSTOP must be greater than or equal to MINPWM" >&2 |
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| 133 | exit 1 |
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| 134 | fi |
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| 135 | if [ "${AFCMINPWM[$fcvcount]}" -lt 0 ] |
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| 136 | then |
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| 137 | echo "Error in configuration file (${AFCPWM[$fcvcount]}):" >&2 |
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| 138 | echo "MINPWM must be at least 0" >&2 |
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| 139 | exit 1 |
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| 140 | fi |
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| 141 | |
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| 142 | echo |
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| 143 | echo "Settings for ${AFCPWM[$fcvcount]}:" |
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| 144 | echo " Depends on ${AFCTEMP[$fcvcount]}" |
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| 145 | echo " Controls ${AFCFAN[$fcvcount]}" |
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| 146 | echo " MINTEMP=${AFCMINTEMP[$fcvcount]}" |
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| 147 | echo " MAXTEMP=${AFCMAXTEMP[$fcvcount]}" |
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| 148 | echo " MINSTART=${AFCMINSTART[$fcvcount]}" |
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| 149 | echo " MINSTOP=${AFCMINSTOP[$fcvcount]}" |
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| 150 | echo " MINPWM=${AFCMINPWM[$fcvcount]}" |
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| 151 | echo " MAXPWM=${AFCMAXPWM[$fcvcount]}" |
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| 152 | let fcvcount=fcvcount+1 |
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| 153 | done |
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| 154 | echo |
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| 155 | } |
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| 156 | |
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| 157 | function DevicePath() |
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| 158 | { |
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| 159 | if [ -h "$1/device" ] |
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| 160 | then |
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| 161 | readlink -f "$1/device" | sed -e 's/^\/sys\///' |
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| 162 | fi |
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| 163 | } |
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| 164 | |
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| 165 | function DeviceName() |
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| 166 | { |
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| 167 | if [ -r "$1/name" ] |
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| 168 | then |
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| 169 | cat "$1/name" | sed -e 's/[[:space:]=]/_/g' |
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| 170 | elif [ -r "$1/device/name" ] |
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| 171 | then |
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| 172 | cat "$1/device/name" | sed -e 's/[[:space:]=]/_/g' |
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| 173 | fi |
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| 174 | } |
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| 175 | |
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| 176 | function ValidateDevices() |
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| 177 | { |
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| 178 | local OLD_DEVPATH="$1" OLD_DEVNAME="$2" outdated=0 |
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| 179 | local entry device name path |
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| 180 | |
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| 181 | for entry in $OLD_DEVPATH |
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| 182 | do |
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| 183 | device=`echo "$entry" | sed -e 's/=[^=]*$//'` |
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| 184 | path=`echo "$entry" | sed -e 's/^[^=]*=//'` |
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| 185 | |
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| 186 | if [ "`DevicePath "$device"`" != "$path" ] |
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| 187 | then |
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| 188 | echo "Device path of $device has changed" >&2 |
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| 189 | outdated=1 |
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| 190 | fi |
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| 191 | done |
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| 192 | |
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| 193 | for entry in $OLD_DEVNAME |
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| 194 | do |
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| 195 | device=`echo "$entry" | sed -e 's/=[^=]*$//'` |
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| 196 | name=`echo "$entry" | sed -e 's/^[^=]*=//'` |
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| 197 | |
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| 198 | if [ "`DeviceName "$device"`" != "$name" ] |
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| 199 | then |
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| 200 | echo "Device name of $device has changed" >&2 |
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| 201 | outdated=1 |
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| 202 | fi |
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| 203 | done |
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| 204 | |
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| 205 | return $outdated |
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| 206 | } |
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| 207 | |
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| 208 | # Check that all referenced sysfs files exist |
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| 209 | function CheckFiles { |
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| 210 | local outdated=0 |
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| 211 | |
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| 212 | let fcvcount=0 |
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| 213 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 214 | do |
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| 215 | pwmo=${AFCPWM[$fcvcount]} |
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| 216 | if [ ! -w $pwmo ] |
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| 217 | then |
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| 218 | echo "Error: file $pwmo doesn't exist" >&2 |
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| 219 | outdated=1 |
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| 220 | fi |
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| 221 | let fcvcount=$fcvcount+1 |
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| 222 | done |
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| 223 | |
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| 224 | let fcvcount=0 |
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| 225 | while (( $fcvcount < ${#AFCTEMP[@]} )) # go through all temp inputs |
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| 226 | do |
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| 227 | tsen=${AFCTEMP[$fcvcount]} |
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| 228 | if [ ! -r $tsen ] |
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| 229 | then |
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| 230 | echo "Error: file $tsen doesn't exist" >&2 |
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| 231 | outdated=1 |
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| 232 | fi |
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| 233 | let fcvcount=$fcvcount+1 |
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| 234 | done |
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| 235 | |
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| 236 | let fcvcount=0 |
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| 237 | while (( $fcvcount < ${#AFCFAN[@]} )) # go through all fan inputs |
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| 238 | do |
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| 239 | # A given PWM output can control several fans |
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| 240 | for fan in $(echo ${AFCFAN[$fcvcount]} | sed -e 's/+/ /') |
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| 241 | do |
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| 242 | if [ ! -r $fan ] |
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| 243 | then |
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| 244 | echo "Error: file $fan doesn't exist" >&2 |
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| 245 | outdated=1 |
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| 246 | fi |
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| 247 | done |
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| 248 | let fcvcount=$fcvcount+1 |
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| 249 | done |
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| 250 | |
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| 251 | if [ $outdated -eq 1 ] |
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| 252 | then |
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| 253 | echo >&2 |
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| 254 | echo "At least one referenced file is missing. Either some required kernel" >&2 |
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| 255 | echo "modules haven't been loaded, or your configuration file is outdated." >&2 |
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| 256 | echo "In the latter case, you should run pwmconfig again." >&2 |
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| 257 | fi |
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| 258 | |
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| 259 | return $outdated |
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| 260 | } |
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| 261 | |
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| 262 | if [ -f "$1" ] |
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| 263 | then |
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| 264 | LoadConfig $1 |
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| 265 | else |
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| 266 | LoadConfig /etc/fancontrol |
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| 267 | fi |
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| 268 | |
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| 269 | # Detect path to sensors |
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| 270 | if echo "${AFCPWM[0]}" | egrep -q '^/' |
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| 271 | then |
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| 272 | DIR=/ |
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| 273 | elif echo "${AFCPWM[0]}" | egrep -q '^hwmon[0-9]' |
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| 274 | then |
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| 275 | DIR=/sys/class/hwmon |
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| 276 | elif echo "${AFCPWM[0]}" | egrep -q '^[1-9]*[0-9]-[0-9abcdef]{4}' |
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| 277 | then |
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| 278 | DIR=/sys/bus/i2c/devices |
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| 279 | else |
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| 280 | echo "$0: Invalid path to sensors" >&2 |
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| 281 | exit 1 |
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| 282 | fi |
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| 283 | |
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| 284 | if [ ! -d $DIR ] |
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| 285 | then |
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| 286 | echo $0: 'No sensors found! (did you load the necessary modules?)' >&2 |
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| 287 | exit 1 |
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| 288 | fi |
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| 289 | cd $DIR |
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| 290 | |
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| 291 | # Check for configuration change |
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| 292 | if [ -z "$DEVPATH" -o -z "$DEVNAME" ] |
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| 293 | then |
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| 294 | echo "Configuration is too old, please run pwmconfig again" >&2 |
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| 295 | exit 1 |
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| 296 | fi |
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| 297 | if ! ValidateDevices "$DEVPATH" "$DEVNAME" |
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| 298 | then |
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| 299 | echo "Configuration appears to be outdated, please run pwmconfig again" >&2 |
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| 300 | exit 1 |
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| 301 | fi |
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| 302 | CheckFiles || exit 1 |
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| 303 | |
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| 304 | if [ -f "$PIDFILE" ] |
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| 305 | then |
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| 306 | echo "File $PIDFILE exists, is fancontrol already running?" >&2 |
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| 307 | exit 1 |
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| 308 | fi |
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| 309 | echo $$ > "$PIDFILE" |
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| 310 | |
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| 311 | # $1 = pwm file name |
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| 312 | function pwmdisable() |
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| 313 | { |
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| 314 | ENABLE=${1}_enable |
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| 315 | # No enable file? Just set to max |
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| 316 | if [ ! -f $ENABLE ] |
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| 317 | then |
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| 318 | echo $MAX > $1 |
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| 319 | return 0 |
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| 320 | fi |
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| 321 | |
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| 322 | # Try pwmN_enable=0 |
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| 323 | echo 0 > $ENABLE 2> /dev/null |
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| 324 | if [ `cat $ENABLE` -eq 0 ] |
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| 325 | then |
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| 326 | # Success |
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| 327 | return 0 |
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| 328 | fi |
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| 329 | |
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| 330 | # It didn't work, try pwmN_enable=1 pwmN=255 |
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| 331 | echo 1 > $ENABLE 2> /dev/null |
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| 332 | echo $MAX > $1 |
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| 333 | if [ `cat $ENABLE` -eq 1 -a `cat $1` -ge 190 ] |
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| 334 | then |
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| 335 | # Success |
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| 336 | return 0 |
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| 337 | fi |
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| 338 | |
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| 339 | # Nothing worked |
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| 340 | echo "$ENABLE stuck to" `cat $ENABLE` >&2 |
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| 341 | return 1 |
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| 342 | } |
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| 343 | |
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| 344 | # $1 = pwm file name |
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| 345 | function pwmenable() |
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| 346 | { |
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| 347 | ENABLE=${1}_enable |
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| 348 | if [ -f $ENABLE ] |
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| 349 | then |
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| 350 | echo 1 > $ENABLE 2> /dev/null |
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| 351 | if [ $? -ne 0 ] |
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| 352 | then |
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| 353 | return 1 |
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| 354 | fi |
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| 355 | fi |
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| 356 | echo $MAX > $1 |
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| 357 | } |
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| 358 | |
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| 359 | function restorefans() |
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| 360 | { |
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| 361 | local status=$1 |
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| 362 | echo 'Aborting, restoring fans...' |
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| 363 | let fcvcount=0 |
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| 364 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 365 | do |
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| 366 | pwmo=${AFCPWM[$fcvcount]} |
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| 367 | pwmdisable $pwmo |
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| 368 | let fcvcount=$fcvcount+1 |
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| 369 | done |
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| 370 | echo 'Verify fans have returned to full speed' |
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| 371 | rm -f "$PIDFILE" |
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| 372 | exit $status |
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| 373 | } |
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| 374 | |
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| 375 | trap 'restorefans 0' SIGQUIT SIGTERM |
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| 376 | trap 'restorefans 1' SIGHUP SIGINT |
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| 377 | |
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| 378 | # main function |
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| 379 | function UpdateFanSpeeds { |
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| 380 | let fcvcount=0 |
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| 381 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 382 | do |
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| 383 | #hopefully shorter vars will improve readability: |
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| 384 | pwmo=${AFCPWM[$fcvcount]} |
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| 385 | tsens=${AFCTEMP[$fcvcount]} |
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| 386 | fan=${AFCFAN[$fcvcount]} |
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| 387 | let mint="${AFCMINTEMP[$fcvcount]}*1000" |
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| 388 | let maxt="${AFCMAXTEMP[$fcvcount]}*1000" |
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| 389 | minsa=${AFCMINSTART[$fcvcount]} |
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| 390 | minso=${AFCMINSTOP[$fcvcount]} |
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| 391 | minpwm=${AFCMINPWM[$fcvcount]} |
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| 392 | maxpwm=${AFCMAXPWM[$fcvcount]} |
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| 393 | |
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| 394 | read tval < ${tsens} |
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| 395 | if [ $? -ne 0 ] |
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| 396 | then |
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| 397 | echo "Error reading temperature from $DIR/$tsens" |
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| 398 | restorefans 1 |
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| 399 | fi |
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| 400 | |
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| 401 | read pwmpval < ${pwmo} |
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| 402 | if [ $? -ne 0 ] |
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| 403 | then |
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| 404 | echo "Error reading PWM value from $DIR/$pwmo" |
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| 405 | restorefans 1 |
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| 406 | fi |
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| 407 | |
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| 408 | # If fanspeed-sensor output shall be used, do it |
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| 409 | if [[ -n ${fan} ]] |
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| 410 | then |
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| 411 | min_fanval=100000 |
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| 412 | fanval= |
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| 413 | # A given PWM output can control several fans |
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| 414 | for one_fan in $(echo $fan | sed -e 's/+/ /') |
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| 415 | do |
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| 416 | read one_fanval < ${one_fan} |
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| 417 | if [ $? -ne 0 ] |
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| 418 | then |
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| 419 | echo "Error reading Fan value from $DIR/$one_fan" >&2 |
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| 420 | restorefans 1 |
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| 421 | fi |
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| 422 | |
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| 423 | # Remember the minimum, it only matters if it is 0 |
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| 424 | if [ $one_fanval -lt $min_fanval ] |
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| 425 | then |
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| 426 | min_fanval=$one_fanval |
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| 427 | fi |
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| 428 | |
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| 429 | if [ -z "$fanval" ] |
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| 430 | then |
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| 431 | fanval=$one_fanval |
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| 432 | else |
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| 433 | fanval="$fanval/$one_fanval" |
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| 434 | fi |
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| 435 | done |
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| 436 | else |
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| 437 | fanval=1 # set it to a non zero value, so the rest of the script still works |
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| 438 | fi |
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| 439 | |
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| 440 | # debug info |
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| 441 | if [ "$DEBUG" != "" ] |
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| 442 | then |
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| 443 | echo "pwmo=$pwmo" |
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| 444 | echo "tsens=$tsens" |
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| 445 | echo "fan=$fan" |
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| 446 | echo "mint=$mint" |
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| 447 | echo "maxt=$maxt" |
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| 448 | echo "minsa=$minsa" |
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| 449 | echo "minso=$minso" |
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| 450 | echo "minpwm=$minpwm" |
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| 451 | echo "maxpwm=$maxpwm" |
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| 452 | echo "tval=$tval" |
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| 453 | echo "pwmpval=$pwmpval" |
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| 454 | echo "fanval=$fanval" |
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| 455 | echo "min_fanval=$min_fanval" |
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| 456 | fi |
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| 457 | |
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| 458 | if (( $tval <= $mint )) |
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| 459 | then pwmval=$minpwm # below min temp, use defined min pwm |
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| 460 | elif (( $tval >= $maxt )) |
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| 461 | then pwmval=$maxpwm # over max temp, use defined max pwm |
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| 462 | else |
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| 463 | # calculate the new value from temperature and settings |
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| 464 | pwmval="(${tval}-${mint})*(${maxpwm}-${minso})/(${maxt}-${mint})+${minso}" |
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| 465 | if [ $pwmpval -eq 0 -o $min_fanval -eq 0 ] |
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| 466 | then # if fan was stopped start it using a safe value |
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| 467 | echo $minsa > $pwmo |
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| 468 | # Sleep while still handling signals |
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| 469 | sleep 1 & |
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| 470 | wait $! |
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| 471 | fi |
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| 472 | fi |
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| 473 | echo $pwmval > $pwmo # write new value to pwm output |
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| 474 | if [ $? -ne 0 ] |
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| 475 | then |
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| 476 | echo "Error writing PWM value to $DIR/$pwmo" >&2 |
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| 477 | restorefans 1 |
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| 478 | fi |
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| 479 | if [ "$DEBUG" != "" ] |
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| 480 | then |
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| 481 | echo "new pwmval=$pwmval" |
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| 482 | fi |
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| 483 | let fcvcount=$fcvcount+1 |
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| 484 | done |
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| 485 | } |
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| 486 | |
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| 487 | echo 'Enabling PWM on fans...' |
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| 488 | let fcvcount=0 |
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| 489 | while (( $fcvcount < ${#AFCPWM[@]} )) # go through all pwm outputs |
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| 490 | do |
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| 491 | pwmo=${AFCPWM[$fcvcount]} |
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| 492 | pwmenable $pwmo |
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| 493 | if [ $? -ne 0 ] |
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| 494 | then |
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| 495 | echo "Error enabling PWM on $DIR/$pwmo" >&2 |
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| 496 | restorefans 1 |
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| 497 | fi |
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| 498 | let fcvcount=$fcvcount+1 |
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| 499 | done |
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| 500 | |
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| 501 | echo 'Starting automatic fan control...' |
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| 502 | |
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| 503 | # main loop calling the main function at specified intervals |
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| 504 | while true |
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| 505 | do |
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| 506 | UpdateFanSpeeds |
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| 507 | # Sleep while still handling signals |
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| 508 | sleep $INTERVAL & |
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| 509 | wait $! |
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| 510 | done |
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