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#!/bin/bash
#
# vt1211_pwm - Manually control the PWM outputs of the VIA vt1211 Super-I/O
#
# Copyright (C) 2008 Juerg Haefliger (juergh at gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
function usage
{
echo "Usage: vt1211_pwm -i <pwm> | -r <pwm> | -s <pwm>,<val>"
echo
echo "DESCRIPTION"
echo " This tool provides manual control of the PWM outputs of the VIA "
echo " vt1211 Super-I/O."
echo
echo "OPTIONS"
echo " -d Display the current PWM settings of the vt1211."
echo " -i <pwm> Initialize the PWM output for manual control."
echo " -r <pwm> Restore the PWM output to the original settings."
echo " -s <pwm>,<val> Set the PWM output duty-cycle. "
echo
echo "WITH"
echo " <pwm> PWM output (1-2)."
echo " <val> PWM duty-cycle (0-255)."
echo
exit 2
}
function set_attr
{
local tmp
read tmp < $1
echo "echo $tmp > $1"
echo $2 > $1
}
# check if we have the right permissions to run
if [ $(whoami) != "root" ] ; then
echo "You must be root to run this script."
exit 1
fi
# parse the command line options
action=
nr=1
val=0
while getopts di:r:s: opt ; do
[ -z "$action" ] || usage
case $opt in
d) action="display"
;;
i) action="init"
nr=$OPTARG
;;
r) action="restore"
nr=$OPTARG
;;
s) action="set"
nr=${OPTARG%,*}
val=${OPTARG#*,}
;;
?) usage
;;
esac
done
[ -z "$action" ] && usage
[ $nr -lt 1 -o $nr -gt 2 ] && usage
[ $val -lt 0 -o $val -gt 255 ] && usage
# check hwmon device
dev=$(ls -d /sys/devices/platform/vt1211.*)
if [ -z "$dev" ] ; then
echo "Platform device vt1211 not found. Did you load the vt1211 module?"
exit 1
fi
# init file
initfile="/root/.vt1211_pwm${nr}"
# ACTION: display
if [ $action = "display" ] ; then
for nr in 1 2 ; do
read mode < ${dev}/pwm${nr}_enable
if [ $mode -eq 0 ] ; then
mode_txt="(disabled)"
elif [ $mode -eq 2 ] ; then
mode_txt="(auto) "
else
mode_txt="(unknown) "
fi
read val < ${dev}/pwm${nr}
dc=$((val * 100 / 255))
echo "pwm${nr}: mode = ${mode} ${mode_txt}, val = ${val} (${dc}%)"
done
fi
# ACTION: init
if [ $action = "init" ] ; then
# check for an init file
if [ -e $initfile ] ; then
echo " $initfile exists. Did you already initialize this PWM?"
exit 1
fi
(
# set the pwm-to-temp mapping
# use the internal temp as a reference
set_attr ${dev}/pwm${nr}_auto_channels_temp 2
# enable the pwm auto controller
set_attr ${dev}/pwm${nr}_enable 2
# set the PWM duty-cycle
set_attr ${dev}/pwm${nr}_auto_point2_pwm 0
set_attr ${dev}/pwm${nr}_auto_point3_pwm 255
# set the temp boundaries to extrem values
set_attr ${dev}/pwm1_auto_point1_temp 0
set_attr ${dev}/pwm1_auto_point2_temp 0
set_attr ${dev}/pwm1_auto_point3_temp 1000000
set_attr ${dev}/pwm1_auto_point4_temp 1000000
) > $initfile
exit 0
fi
# ACTION: restore
if [ $action = "restore" ] ; then
# check for an init file
if [ ! -e $initfile ] ; then
echo " $initfile not found. Nothing to restore."
exit 1
fi
sh $initfile
rm $initfile
exit 0
fi
# ACTION: set
if [ $action = "set" ] ; then
# check for an init file
if [ ! -e $initfile ] ; then
echo "$initfile not found. Did you initialize this PWM?"
exit 1
fi
# set the PWM duty-cycle
echo $val > ${dev}/pwm${nr}_auto_point3_pwm
# fool the vt1211 into believing there is a temp change
# otherwise the new PWM duty-cycle doesn't take effect
echo 0 > ${dev}/pwm1_auto_point3_temp
echo 1000000 > ${dev}/pwm1_auto_point3_temp
# read the new PWM duty-cycle back and print it
read val < ${dev}/pwm${nr}
dc=$((val * 100 / 255))
echo "pwm${nr} is now at ${val} (${dc}%)."
exit 0
fi
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