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# vt1211_pwm - Manually control the PWM outputs of the VIA vt1211 Super-I/O
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# Copyright (C) 2008 Juerg Haefliger (juergh at gmail.com>
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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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# 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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# 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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echo "Usage: vt1211_pwm -i <pwm> | -r <pwm> | -s <pwm>,<val>"
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echo " This tool provides manual control of the PWM outputs of the VIA "
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echo " vt1211 Super-I/O."
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echo " -d Display the current PWM settings of the vt1211."
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echo " -i <pwm> Initialize the PWM output for manual control."
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echo " -r <pwm> Restore the PWM output to the original settings."
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echo " -s <pwm>,<val> Set the PWM output duty-cycle. "
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echo " <pwm> PWM output (1-2)."
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echo " <val> PWM duty-cycle (0-255)."
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# check if we have the right permissions to run
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if [ `whoami` != "root" ] ; then
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echo "You must be root to run this script."
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# parse the command line options
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while getopts di:r:s: opt ; do
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[ -z "$action" ] || usage
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[ -z "$action" ] && usage
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[ $nr -lt 1 -o $nr -gt 2 ] && usage
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[ $val -lt 0 -o $val -gt 255 ] && usage
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dev=`ls -d /sys/devices/platform/vt1211.*`
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if [ -z "$dev" ] ; then
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echo "Platform device vt1211 not found. Did you load the vt1211 module?"
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initfile="/root/.vt1211_pwm${nr}"
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if [ $action = "display" ] ; then
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read mode < ${dev}/pwm${nr}_enable
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if [ $mode -eq 0 ] ; then
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mode_txt="(disabled)"
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elif [ $mode -eq 2 ] ; then
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mode_txt="(unknown) "
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read val < ${dev}/pwm${nr}
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dc=$((val * 100 / 255))
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echo "pwm${nr}: mode = ${mode} ${mode_txt}, val = ${val} (${dc}%)"
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if [ $action = "init" ] ; then
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# check for an init file
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if [ -e $initfile ] ; then
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echo " $initfile exists. Did you already initialize this PWM?"
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# set the pwm-to-temp mapping
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# use the internal temp as a reference
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set_attr ${dev}/pwm${nr}_auto_channels_temp 2
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# enable the pwm auto controller
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set_attr ${dev}/pwm${nr}_enable 2
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# set the PWM duty-cycle
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set_attr ${dev}/pwm${nr}_auto_point2_pwm 0
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set_attr ${dev}/pwm${nr}_auto_point3_pwm 255
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# set the temp boundaries to extrem values
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set_attr ${dev}/pwm1_auto_point1_temp 0
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set_attr ${dev}/pwm1_auto_point2_temp 0
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set_attr ${dev}/pwm1_auto_point3_temp 1000000
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set_attr ${dev}/pwm1_auto_point4_temp 1000000
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if [ $action = "restore" ] ; then
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# check for an init file
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if [ ! -e $initfile ] ; then
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echo " $initfile not found. Nothing to restore."
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if [ $action = "set" ] ; then
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# check for an init file
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if [ ! -e $initfile ] ; then
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echo "$initfile not found. Did you initialize this PWM?"
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# set the PWM duty-cycle
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echo $val > ${dev}/pwm${nr}_auto_point3_pwm
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# fool the vt1211 into believing there is a temp change
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# otherwise the new PWM duty-cycle doesn't take effect
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echo 0 > ${dev}/pwm1_auto_point3_temp
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echo 1000000 > ${dev}/pwm1_auto_point3_temp
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# read the new PWM duty-cycle back and print it
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read val < ${dev}/pwm${nr}
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dc=$((val * 100 / 255))
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echo "pwm${nr} is now at ${val} (${dc}%)."
added
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prog/pwm/vt1211_pwm
