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Update fancontrol to save original pwm values

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Update fancontrol script to save the values of pwmN_enable and pwmN
when it starts and restore the values, when it exits.
Closes groeck/lm-sensors#47.

Signed-off-by: Roland Ramthun <bts@roland-ramthun.de>
[groeck: Split description into multiple lines]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Roland Ramthun authored and Guenter Roeck committed 2018-02-04 08:56:58 -08:00
1 parent 7547870646
commit 34627e4666
1 file changed
+58
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prog/pwm/fancontrol
+58
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@@ -378,6 +378,11 @@ then
fi
echo $$ > "$PIDFILE"
# associative arrays to hold pwmN device name as key, and as value the
# pwmN_enable and pwmN values as they were before fancontrol was started
declare -A PWM_ENABLE_ORIG_STATE
declare -A PWM_ORIG_STATE
# $1 = pwm file name
function pwmdisable()
{
@@ -390,6 +395,43 @@ function pwmdisable()
return 0
fi
# Try to restore pwmN and pwmN_enable value to the same state as before
# fancontrol start. Restoring the pwmN value is tried first, before the
# pwmN_enable mode switch.
# Some chips seem to need this to properly restore fan operation,
# when activating automatic (2) mode.
if [ ${PWM_ENABLE_ORIG_STATE[${1}]} ]
then
#restore the pwmN value
if [ "$DEBUG" != "" ]
then
echo "Restoring ${1} original value of ${PWM_ORIG_STATE[${1}]}"
fi
echo ${PWM_ORIG_STATE[${1}]} > ${1} 2> /dev/null
# restore the pwmN_enable value, if it is not 1.
# 1 is already set through fancontrol and setting it again might just
# reset the pwmN value.
if [ ${PWM_ENABLE_ORIG_STATE[${1}]} != 1 ]
then
if [ "$DEBUG" != "" ]
then
echo "Restoring $ENABLE original value of ${PWM_ENABLE_ORIG_STATE[${1}]}"
fi
echo ${PWM_ENABLE_ORIG_STATE[${1}]} > $ENABLE 2> /dev/null
# check if setting pwmN_enable value was successful. Checking the
# pwmN value makes no sense, as it might already have been altered
# by the chip.
if [ `cat $ENABLE` = ${PWM_ENABLE_ORIG_STATE[${1}]} ]
then
return 0
fi
# if pwmN_enable is manual (1), check if restoring the pwmN value worked
elif [ `cat ${1}` = ${PWM_ORIG_STATE[${1}]} ]
then
return 0
fi
fi
# Try pwmN_enable=0
echo 0 > $ENABLE 2> /dev/null
if [ `cat $ENABLE` -eq 0 ]
@@ -419,6 +461,22 @@ function pwmenable()
if [ -f $ENABLE ]
then
# save the original pwmN_control state, e.g. 1 for manual or 2 for auto,
# and the value from pwmN
local PWM_CONTROL_ORIG=`cat $ENABLE`
local PWM_ORIG=`cat ${1}`
if [ "$DEBUG" != "" ]
then
echo "Saving $ENABLE original value as $PWM_CONTROL_ORIG"
echo "Saving ${1} original value as $PWM_ORIG"
fi
#check for degenerate case where these values might be empty
if [ $PWM_CONTROL_ORIG ] && [ $PWM_ORIG ]
then
PWM_ENABLE_ORIG_STATE[${1}]=$PWM_CONTROL_ORIG
PWM_ORIG_STATE[${1}]=$PWM_ORIG
fi
# enable manual control by fancontrol
echo 1 > $ENABLE 2> /dev/null
if [ $? -ne 0 ]
then