mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-11-11 16:40:16 +00:00
Jean Delvare
fd9077bd03
This is simpler and will work better in most cases. For example this should address at least part of ticket #2224. It seems that quadratic was used to lower the average noise level, but I don't think this is a valid reason. The new MINPWM and MAXPWM parameters will also let the user control the noise level if really needed. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4588 7894878c-1315-0410-8ee3-d5d059ff63e0
429 lines
10 KiB
Perl
Executable File
429 lines
10 KiB
Perl
Executable File
#!/usr/bin/perl -wT
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# $Id$
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#
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# Perl script for temperature dependent fan speed control.
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#
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# Copyright 2004 dean takemori <deant@hawaii.rr.com>
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#
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# This is a reimplementation in perl of Marius Reiner's bash script for
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# fan speed control. It has advantages in that it can daemonize itself
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# and needn't spawn subprocesses for grep, sleep etc. Much of the structure
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# of the bash script is preserved to make mirroring changes easier, so
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# this is seriously non-idiomatic perl but at the same time it should not
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# be considered a a direct bash to perl translation.
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#
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# Usage: fancontrol [CONFIGFILE]
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#
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# For configuration instructions and warnings please see fancontrol.txt,
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# which can be found in the doc/ directory or at the website mentioned
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# elsewhere.
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#
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# This script is derived from Marius Reiner's bash version, so it is
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# hereby placed under the GPL.
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#
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# Copyright 2003 Marius Reiner <marius.reiner@hdev.de>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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use warnings;
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use strict;
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use IO::Handle;
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use Getopt::Std;
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use POSIX;
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$ENV{PATH} = "/bin:/usr/bin";
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##### Configuration #####
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use constant DEBUG => 0;
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use constant MAX => 255;
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use constant PIDFILE => '/var/run/fancontrol.pid';
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use constant CONFFILE => '/etc/fancontrol';
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use constant LOGFILE => '/var/log/fancontrol/fancontrol.log';
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use constant ERRFILE => '/var/log/fancontrol/fancontrol.err';
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### End Configuration ###
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our $interval;
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our $pwmo;
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our @afcpwm;
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our @afctemp;
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our @afcfan;
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our @afcmaxtemp;
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our @afcmintemp;
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our @afcminstart;
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our @afcminstop;
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sub loadconfig($);
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sub pwmdisable($);
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sub pwmenable($);
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sub restorefans();
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sub calc(@);
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sub UpdateFanSpeeds();
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END { restorefans(); }
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our $opt_d;
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getopts('d');
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my $config = shift;
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if (defined($config))
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{ loadconfig($config); }
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else
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{ loadconfig(CONFFILE); }
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### Daemonize
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if ( defined($opt_d) && ($opt_d == 1) )
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{
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my $pid = fork;
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POSIX::_exit(0) if $pid;
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unless (defined($pid))
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{ die("Couldn't fork: $!"); }
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open(*STDERR, '>', ERRFILE);
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IO::Handle::autoflush(*STDERR);
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open(*STDOUT, '>>', LOGFILE);
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IO::Handle::autoflush(*STDOUT);
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unless (POSIX::setsid())
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{ die("Couldn't open new session: $!"); }
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}
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### Pidfile
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if (open(FILE, ">" . PIDFILE))
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{
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print(FILE "$$\n");
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close(FILE);
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}
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else
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{ print(PIDFILE . ": $!\n"); }
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### What kind of interface?
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our $sysfs = 0;
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our $dir = '/proc/sys/dev/sensors';
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if (!(-d $dir))
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{
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if ($afcpwm[0] =~ m/^hwmon\d/)
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{
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$dir = '/sys/class/hwmon';
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}
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else
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{
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$dir = '/sys/bus/i2c/devices';
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}
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if (!(-d $dir))
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{ die("No sensors found! (are the necessary modules loaded?) :
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$!\n"); }
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else
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{
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$sysfs = 1;
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}
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}
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### Trap signals
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$SIG{TERM} = \&restorefans;
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$SIG{HUP} = \&restorefans;
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$SIG{INT} = \&restorefans;
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$SIG{QUIT} = \&restorefans;
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### Enable PWM
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print("Enabling PWM on fans...\n");
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my $fcvcount = 0;
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while ($fcvcount < $#afcpwm+1)
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{
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$pwmo = $afcpwm[$fcvcount];
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unless (pwmenable($pwmo))
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{ die("Error enabling PWM on $dir/$pwmo : $!\n"); }
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$fcvcount++;
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}
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print("Starting automatic fan control...\n");
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while(1)
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{
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UpdateFanSpeeds();
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sleep($interval);
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}
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1;
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################################################################
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sub loadconfig($)
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{
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my $file = shift;
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print("Loading configuration from $file ...\n");
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unless ( (-e $file) && (-r $file) )
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{ die("Unable to read config file $file: $!"); }
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open(F, $file);
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our ($interval, $fctemps, $fcfans, $mintemp, $maxtemp, $minstart,
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$minstop);
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while($_ = <F>)
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{
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if ($_ =~ /^\s+$/) { next; }
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elsif ($_ =~ /^INTERVAL=\s*(.*)$/) { $interval = $1; next; }
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elsif ($_ =~ /^FCTEMPS=\s*(.*)$/) { $fctemps = $1; next; }
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elsif ($_ =~ /^FCFANS=\s*(.*)$/) { $fcfans = $1; next; }
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elsif ($_ =~ /^MINTEMP=\s*(.*)$/) { $mintemp = $1; next; }
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elsif ($_ =~ /^MAXTEMP=\s*(.*)$/) { $maxtemp = $1; next; }
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elsif ($_ =~ /^MINSTART=\s*(.*)$/) { $minstart = $1; next; }
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elsif ($_ =~ /^MINSTOP=\s*(.*)$/) { $minstop = $1; next; }
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}
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close(F);
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unless (defined($interval))
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{ die("Some settings missing ..."); }
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print("\nCommon settings:\n");
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print(" INTERVAL=$interval\n");
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my $fcvcount = 0;
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foreach my $fcv (split(/\s+/, $fctemps))
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{
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($afcpwm[$fcvcount], $afctemp[$fcvcount]) = split(/=/, $fcv);
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$fcfans =~ s/^\S*=(\S+)\s*//; $afcfan[$fcvcount] = $1;
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$mintemp =~ s/^\S*=(\S+)\s*//; $afcmintemp[$fcvcount] = $1;
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$maxtemp =~ s/^\S*=(\S+)\s*//; $afcmaxtemp[$fcvcount] = $1;
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$minstart =~ s/^\S*=(\S+)\s*//; $afcminstart[$fcvcount] = $1;
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$minstop =~ s/^\S*=(\S+)\s*//; $afcminstop[$fcvcount] = $1;
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print("\nSettings for $afcpwm[$fcvcount]:\n");
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print(" Depends on $afctemp[$fcvcount]\n");
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print(" Controls $afcfan[$fcvcount]\n");
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print(" MINTEMP = $afcmintemp[$fcvcount]\n");
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print(" MAXTEMP = $afcmaxtemp[$fcvcount]\n");
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print(" MINSTART = $afcminstart[$fcvcount]\n");
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print(" MINSTOP = $afcminstop[$fcvcount]\n");
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$fcvcount++;
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}
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}
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################################################################
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sub pwmdisable($)
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{
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my $p = shift;
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if ($sysfs == 1)
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{
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if (open(F, ">$dir/$p"))
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{
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print(F MAX . '\n');
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close(F);
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}
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else
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{ die("$dir/$p : $!"); }
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my $enable = "$dir/${p}_enable";
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if (-f $enable)
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{
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if (open(F, ">$enable"))
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{
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print(F '0');
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close(F);
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}
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else
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{ die("$enable : $!"); }
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}
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}
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else
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{
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if (open(F, ">$dir/$p"))
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{
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print(F MAX . ' 0');
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close(F);
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}
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else
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{ die("$dir/$p : $!"); }
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}
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return(1);
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}
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#################################################################
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sub pwmenable($)
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{
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my $p = shift;
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if ($sysfs == 1)
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{
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my $enable = "$dir/${p}_enable";
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if (-f $enable)
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{
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if (open(F, ">$enable"))
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{
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print(F "1\n");
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close(F);
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}
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else
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{ die("$enable : $!\n"); }
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}
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}
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else
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{
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if (open(F, ">$dir/$p"))
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{
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print(F MAX . " 1\n");
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close(F);
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}
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else
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{ die("$dir/$p : $!\n"); }
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}
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return(1);
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}
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################################################################
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sub restorefans()
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{
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$SIG{TERM} = 'IGNORE';
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$SIG{HUP} = 'IGNORE';
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$SIG{INT} = 'IGNORE';
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$SIG{QUIT} = 'IGNORE';
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print("Aborting, restoring fans...\n");
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my $fcvcount = 0;
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while ( $fcvcount < $#afcpwm+1)
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{
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my $pwmo = $afcpwm[$fcvcount];
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&pwmdisable($afcpwm[$fcvcount]);
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$fcvcount++;
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}
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print("Verify fans have returned to full speed\n");
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POSIX:_exit(-1);
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}
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############################################################
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sub UpdateFanSpeeds()
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{
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my $fcvcount = 0;
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while ($fcvcount < $#afcpwm+1)
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{
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my $pwmo = $afcpwm[$fcvcount];
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my $tsens = $afctemp[$fcvcount];
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my $fan = $afcfan[$fcvcount];
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my $mint = $afcmintemp[$fcvcount];
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my $maxt = $afcmaxtemp[$fcvcount];
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my $minsa = $afcminstart[$fcvcount];
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my $minso = $afcminstop[$fcvcount];
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### tval
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my $tval = 0;
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if (open(F, "$dir/$tsens"))
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{
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$tval = <F>;
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close(F);
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}
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else
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{ die("Error reading temperature from $dir/$tsens"); }
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$tval =~ /([.\d]+)\s*$/;
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$tval = int($1);
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if ($sysfs == 1)
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{ $tval /= 1000; }
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### pwmpval
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my $pwmpval = 0;
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if (open(F, "$dir/$pwmo"))
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{
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$pwmpval = <F>;
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close(F);
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}
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else
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{ die("Error reading PWM value from $dir/$pwmo"); }
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($pwmpval) = split(/\s/, $pwmpval);
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### fanval
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my $fanval = 0;
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if (open(F, "$dir/$fan"))
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{
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$fanval = <F>;
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close(F);
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}
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else
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{ die("Error reading Fan value from $dir/$fan"); }
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$fanval =~ /(\d+)\s$/;
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$fanval = $1;
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### DEBUG
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if (DEBUG == 1)
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{
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print("pwmo=$pwmo\n");
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print("tsens=$tsens\n");
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print("fan=$fan\n");
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print("mint=$mint\n");
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print("maxt=$maxt\n");
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print("minsa=$minsa\n");
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print("minso=$minso\n");
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print("tval=$tval\n");
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print("pwmpval=$pwmpval\n");
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print("fanval=$fanval\n");
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print("\n");
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}
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my $pwmval;
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if ($tval <= $mint)
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{ $pwmval = 0; }
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elsif ($tval >= $maxt)
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{ $pwmval = MAX; }
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else
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{
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$pwmval = eval ( ($tval - $mint) / ($maxt - $mint) );
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$pwmval *= (255 - $minso);
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$pwmval += $minso;
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$pwmval = int($pwmval);
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if ( ($pwmval == 0) || ($fanval == 0) )
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{
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if (open(F, ">$dir/$pwmo"))
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{
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print(F "$minsa\n");
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close(F);
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}
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else
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{ die("Error writing PWM value to $dir/$pwmo : $!\n"); }
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sleep 1;
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}
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}
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if (open(F, ">$dir/$pwmo"))
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{
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print(F "$pwmval\n");
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close(F);
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}
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else
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{ die("Error writing PWM value to $dir/$pwmo : $!\n"); }
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if (DEBUG == 1)
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{ print("new pwmval = $pwmval\n"); }
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$fcvcount++;
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}
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}
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1;
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