Show /etc/fancontrol in a more human-readable format

show-fancontrol-config.sh

#!/bin/bash

awk '
BEGIN {
  FS = "=";
  section_order[1] = "CURRENT";
  section_order[2] = "MINTEMP";
  section_order[3] = "MAXTEMP";
  section_order[4] = "MINPWM";
  section_order[5] = "MINSTART";
  section_order[6] = "MINSTOP";
  section_order[7] = "FCTEMPS";
  section_order[8] = "FCFANS";

  COMMENT["MINTEMP"]  = "Below this, the fan can run at minimum speed";
  COMMENT["MAXTEMP"]  = "Fan reaches full speed at this point"
  COMMENT["MINPWM"]   = "Fan’s lowest reliable speed without stalling";
  COMMENT["MINSTART"] = "PWM value needed to reliably start the fan from a stop";
  COMMENT["MINSTOP"]  = "PWM below this stops the fan. This should be a bit lower than MINSTART";
}

{
  if ($1 ~ /^#/) next;
  if ($1 ~ /^INTERVAL/) next;
  section = $1;
  value = substr($0, index($0, "=")+1);
  n = split(value, arr, " ");
  for (i = 1; i <= n; i++) {
    split(arr[i], kv, "=");
    if (length(kv[2]) > 0) {
      data[kv[1]][section] = kv[2];
    } else {
      data[kv[1]][section] = "";  # for single values
    }
  }
}

END {
  print "==== device list ====\n";
  for (dev in data) {
    if (dev ~ /\//) continue;  # exclude fans
    print dev ":";
    for (section in data[dev]) {
      printf "  %-10s -> %s\n", section, data[dev][section];
    }
    print "";
  }

  print "==== fan configuration ====\n";
  for (fan in data) {
    if (fan !~ /\//) continue; # only show fan data
    desc=""
    if (fan == "hwmon3/pwm2") desc=" (CPU)";
    if (fan == "hwmon3/pwm7") desc=" (MOBO)";
    if (fan == "hwmon3/pwm3") desc=" (Back of case)";
    if (fan == "hwmon3/pwm4") desc=" (Side wall - top)";
    if (fan == "hwmon3/pwm5") desc=" (Side wall - bottom)";
    if (fan == "hwmon3/pwm6") desc=" (Side wall - middle)";

    # get the current fan speed
    cmd="cat /sys/class/hwmon/" fan;
    cmd | getline current_value;
    close(cmd);

    data[fan]["CURRENT"]=sprintf("%d (%d%% power)", current_value, current_value/255*100);

    print fan desc ":";

    for (so = 1; so in section_order; so++) {
      sec = section_order[so];
      if (sec in data[fan]) {
        if (sec == "FCTEMPS" || sec == "FCFANS") {
          # get the value of the temp monitor
          cmd="cat /sys/class/hwmon/" data[fan][sec];
          cmd | getline current_value;
          close(cmd);

          if (sec == "FCTEMPS") {
            current_value=current_value/1000
            current_value=sprintf("%d °C", current_value)
          }

          line = sprintf("%-10s -> %s (%s)", sec, data[fan][sec], current_value);
        } else {
          line = sprintf("%-10s -> %s", sec, data[fan][sec]);
        }

        if (COMMENT[sec] != "") {
          printf "  %-42s # %s\n", line, COMMENT[sec];
        } else {
          printf "  %-42s\n", line;
        }
      }
    }

    for (section in data[fan]) {
      found = 0;
      for (so = 1; so in section_order; so++) {
        if (section == section_order[so]) {
          found = 1;
          break;
        }
      }

      if (!found) {
        printf "  %-10s -> %s\n", section, data[fan][section];
      }
    }

    print "";
  }
}
' /etc/fancontrol

example output:

==== device list ====

hwmon1:
  DEVNAME    -> k10temp
  DEVPATH    -> devices/pci0000:00/0000:00:18.3

hwmon3:
  DEVNAME    -> nct6797
  DEVPATH    -> devices/platform/nct6775.2592

==== fan configuration ====

hwmon3/pwm6 (Side wall - middle):
  CURRENT    -> 177 (69% power)             
  MINTEMP    -> 40                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINSTART   -> 150                          # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 60                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon1/temp1_input (68 °C)  
  FCFANS     -> hwmon3/fan6_input (1206)    

hwmon3/pwm7 (MOBO):
  CURRENT    -> 0 (0% power)                
  MINTEMP    -> 45                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINSTART   -> 40                           # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 30                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon3/temp1_input (32 °C)  
  FCFANS     -> hwmon3/fan7_input (0)       

hwmon3/pwm2 (CPU):
  CURRENT    -> 149 (58% power)             
  MINTEMP    -> 55                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINPWM     -> 34                           # Fan’s lowest reliable speed without stalling
  MINSTART   -> 75                           # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 70                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon1/temp1_input (68 °C)  
  FCFANS     -> hwmon3/fan2_input (1785)    

hwmon3/pwm3 (Back of case):
  CURRENT    -> 169 (66% power)             
  MINTEMP    -> 40                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINSTART   -> 50                           # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 40                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon1/temp1_input (68 °C)  
  FCFANS     -> hwmon3/fan3_input (1272)    

hwmon3/pwm4 (Side wall - top):
  CURRENT    -> 169 (66% power)             
  MINTEMP    -> 40                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINSTART   -> 50                           # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 40                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon1/temp1_input (68 °C)  
  FCFANS     -> hwmon3/fan4_input (1451)    

hwmon3/pwm5 (Side wall - bottom):
  CURRENT    -> 169 (66% power)             
  MINTEMP    -> 40                           # Below this, the fan can run at minimum speed
  MAXTEMP    -> 90                           # Fan reaches full speed at this point
  MINSTART   -> 50                           # PWM value needed to reliably start the fan from a stop
  MINSTOP    -> 40                           # PWM below this stops the fan. This should be a bit lower than MINSTART
  FCTEMPS    -> hwmon1/temp1_input (68 °C)  
  FCFANS     -> hwmon3/fan5_input (1112)