code.delx.au - monosys/blob - hw/lenovo-m93p/etc/fancontrol

   1 #!/bin/bash
   2
   3 # https://www.kernel.org/doc/html/latest/hwmon/it87.html
   4 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2cbb9c370fe32b5de5243f7338dc6ce8747d495b
   5
   6 set -eux
   7
   8 modprobe it87
   9
  10 CT="$(grep -l coretemp /sys/class/hwmon/hwmon*/name | head -n1 | xargs dirname)/temp1_input"
  11 cd "$(grep -l it8792 /sys/class/hwmon/hwmon*/name | head -n1 | xargs dirname)"
  12
  13 grep . pwm1* temp1*
  14
  15 # automatic fan control - the chip seems to ignore these settings
  16 #echo 2          > pwm1_enable                  # automatic mode
  17 #echo 1          > pwm1_auto_channels_temp      # temperature channel
  18 #echo 127000     > pwm1_auto_point1_temp_hyst   # ??
  19 #echo 127000     > pwm1_auto_point1_temp        # fan off temp
  20 #echo 127000     > pwm1_auto_point2_temp        # fan start temp
  21 #echo 127000     > pwm1_auto_point3_temp        # fan max temperature
  22 #echo 100        > pwm1_auto_start              # start pwm value
  23 #echo 0          > pwm1_auto_slope              # pwm slope, 1/8th pwm
  24
  25 # manual fan control - magic incantation
  26 echo 1          > pwm1_enable                   # manual mode
  27 echo 200000     > pwm1_freq                     # quieter fan
  28 echo 0          > temp3_type                    # disabled unused sensor
  29 echo 4          > temp1_type                    # switch sensor to thermistor
  30 sleep 1                                         # wait for driver to write to chip
  31 echo 0          > temp1_type                    # disable the sensor
  32 echo 42         > pwm1                          # set the fan speed
  33
  34 grep . *pwm1* temp1*
  35
  36 set +x
  37 OLDPWM="$(cat pwm1)"
  38 while sleep 1; do
  39     TEMPC="$(cat "$CT")"
  40     if [ "$TEMPC" -ge 85000 ]; then
  41         NEWPWM=255
  42     elif [ "$TEMPC" -ge 80000 ]; then
  43         NEWPWM=180
  44     elif [ "$TEMPC" -ge 60000 ]; then
  45         NEWPWM=130
  46     else
  47         NEWPWM=100
  48     fi
  49     if [ "$OLDPWM" -ne "$NEWPWM" ]; then
  50         echo "Fan speed change: OLDPWM=$OLDPWM TEMPC=$TEMPC NEWPWM=$NEWPWM"
  51         echo "$NEWPWM" > pwm1
  52         OLDPWM="$NEWPWM"
  53         sleep 30
  54     fi
  55 done