Hardware control script for PR2100/PR4100

wdhws.sh

#!/bin/bash
#
# Post-init script for FreeNAS on Western Digital PR2100/PR4100 
# wdhws v1.0 by TFL
# 
# BSD 3 LICENSE
#
# thanks unix stackexchange question 231975

setup_tty() {
    tty=/dev/cuau3
    exec 4<$tty 5>$tty
}

setup_i2c() {
    # load kernel modules required for the temperature sensor on the RAM modules
    kldload -n iicbus smbus smb ichsmb
}

send() {
    setup_tty
    # send a command to the PMC module and echo the answer
    echo -ne "$1\r" >&5
    read ans <&4
    if [ "$ans" = "ALERT" ]; then
        echo -ne ALERT >&2
        exit 2 
    else
        # keep this for debugging failing commands
        if [ "$ans" = "ERR" ] || [ -z "$ans" ]; then
            echo "CMD $1 gives ERR at $2" >&2
            send_empty
            ans=$(send "$1" $(($2 + 1)))
            #exit 1
        fi
    fi
    # only echo the result for retries ($2 not empty)
    if [ ! -z $2 ]; then 
        echo "CMD $1 gives '$ans' at $2" >&2 
    fi 
    echo $ans
    send_empty
    # deconstruct tty file pointers, otherwise this script breaks on sleep 
    exec 4<&- 5>&-
}

send_empty() {
    # send a empty command to clear the output
    echo -ne "\r" >&5
    read ignore <&4
}

get_ncpu() {
    # get the number of CPUs
    sysctl -n hw.ncpu
}

get_coretemp() {
    # get the CPU temperature and strip of the Celsius
    sysctl -n dev.cpu.$1.temperature | cut -d'.' -f1
}

get_disktemp() {
    # get the disk $i temperature only if it is spinning
    smartctl -n standby -A /dev/ada$1 | grep Temperature_Celsius | awk '{print $NF}'
}

get_ramtemp() {
    # get the memory temperature from the I2C sensor
    smbmsg -s 0x98 -c 0x0$1 -i 1 -F %d
}

get_pmc() {
    # get a value from the PMC
    # e.g. TMP returns TMP=25 --> 25
    send $1 | cut -d'=' -f2
}

init() {
    setup_tty
    setup_i2c

    echo "get system status and firmware"
    send VER
    send CFG 
    send STA
    
    show_welcome
    stop_powerled
}

show_welcome() {
    # set welcome message
    # maximum  "xxx xxx xxx xxx " 
    send   "LN1=    FreeNAS     "
    send   "LN2= go go go go go " 
}

stop_powerled() {
    # stop blinking power LED
    send PLS=00
    send LED=00  # set to 01 to enable it
    send BLK=00
}

show_ip() {
    send "LN1=Interface re$1"
    ip=$(ifconfig re$1 | grep inet | awk '{printf $2}')
    send "LN2=$ip"
}

monitor() {
    lvl="COOL"

    # check RPM (fan may get stuck) and convert hex to dec
    fan=$(get_pmc FAN)
    rpm=$((0x$(get_pmc RPM)))
    echo "Got rpm $rpm"
    if [ "$rpm" != ERR ]; then
        if [ "$rpm" -lt 400 ]; then
            echo "WARNING: low RPM - $rpm - clean dust!"
        fi
    fi
    
    # check pmc  
    tmp=$((0x$(get_pmc TMP)))
    if [ "$tmp" -gt 64 ]; then
        lvl="HOT"
    fi

    # check disks [adjust this for PR2100!!]
    for i in 0 1 2 3 ; do
        tmp=$(get_disktemp $i)
        echo "disk $i is $tmp"
        if [ ! -z $tmp ] && [ "$tmp" -gt 40 ]; then
            echo "Disk $i temperature is $tmp" 
            lvl="HOT"
        fi
    done

    # check cpu
    for i in $(seq $(get_ncpu)); do
        tmp=$(get_coretemp $((i-1)))
        echo "cpu $i is $tmp"
        if [ "$tmp" -gt 50 ]; then
            echo "CPU $i temperature is $tmp"
            lvl="HOT"
        fi
    done
 
    # check ram
    for i in 0 1; do
        tmp=$(get_ramtemp $i)
        echo "ram temp is $tmp for $i"
        if [ "$tmp" -gt 40 ]; then
            echo "RAM $i temperature is $tmp"
            lvl="HOT"
        fi
    done 

    echo "Temperature LVL is $lvl"
    if [ "$lvl" == HOT ] ; then
        if [ "$fan" != 40 ]; then
            send FAN=40
        fi
    else
        if [ "$fan" != 20 ]; then
            send FAN=20 
        fi
    fi
}

check_btn_pressed() {
    btn=$(get_pmc ISR) 
    #echo "Btn is .$btn."
    
    case $btn in
    20*)
        echo "Button up pressed!"
        menu=$(( ($menu + 1) % 3 ))
        ;;
    40*) 
        echo "Button down pressed!"
        menu=$(( ($menu + 2) % 3 ))
        ;;
    *)
        return    
    esac
    
    case "$menu" in
    0)
        show_welcome
        ;;
    1)
        show_ip 0
        ;;
    2)
        show_ip 1
        ;;
    # if you add menu items here, update mod 3 uses above    
    esac        
}

# initial setup
init

while true; do
    # adjust fan speed every 30 seconds
    monitor

    # check for button presses
    for i in $(seq 30); do 
        sleep 1
        check_btn_pressed
    done
done

Hi, Stefaang!
Thank you very much for script, it does a great job!
Something changed in smartctl command, and get_disktemp gives something like 24/55 (it is minimum and maximum lifetime temperature)
I changed script line 65 a little and it worked well by now:
smartctl -n standby -A /dev/ada$1 | grep Temperature_Celsius | cut -d'/' -f37 | awk '{print $NF}'
I don't have a bash scripting experience at all, please correct if needed.
edit:corrected by forum post

use for dsm 6.1.7
I think you'll need another tty port, but yes.

Can anyone explain how to do this? I am running dsm7.1 on a pr4100, and would love to use this script.... please help

Can anyone explain how to do this? I am running dsm7.1 on a pr4100, and would love to use this script.... please help

You should find tty, which used by pr4100 screen, and correct script in row 11.
How to find correct tty (or at least limiting the results)
https://stackoverflow.com/questions/2530096/how-to-find-all-serial-devices-ttys-ttyusb-on-linux-without-opening-them

Can anyone explain how to do this? I am running dsm7.1 on a pr4100, and would love to use this script.... please help

You should find tty, which used by pr4100 screen, and correct script in row 11. How to find correct tty (or at least limiting the results) https://stackoverflow.com/questions/2530096/how-to-find-all-serial-devices-ttys-ttyusb-on-linux-without-opening-them

root@PR4100:/# ll /sys/class/tty/*/device/driver
lrwxrwxrwx 1 root root 0 Apr 19 03:57 /sys/class/tty/ttyS0/device/driver -> ../../../bus/platform/drivers/serial8250
lrwxrwxrwx 1 root root 0 Apr 19 03:57 /sys/class/tty/ttyS1/device/driver -> ../../../bus/platform/drivers/serial8250
lrwxrwxrwx 1 root root 0 Apr 19 03:57 /sys/class/tty/ttyS2/device/driver -> ../../../bus/pci/drivers/serial
lrwxrwxrwx 1 root root 0 Apr 19 03:57 /sys/class/tty/ttyS3/device/driver -> ../../../bus/pci/drivers/serial

How do I know which one is talking to the screen?

Hey stefan! Thank you for your post on the forum and this script!

Running TrueNAS-13.0-U4, I had to change line 65 to
smartctl -n standby -A /dev/ada$1 | grep Temperature_Celsius | awk '{print $NF-1}'
In order to get the correct value for disk temperature

Hey Everyone, have any of you moved to Scale from Core? If so, how did you handle hardware as this script appears to no longer work.

FYI for anyone looking for the Scale answer, Scale is now Debian Linux instead of FreeBSD. TrueNAS Core is FreeBSD. In any event, I had to change the tty from tty=/dev/cuau3 to tty=/dev/ttyS2. That appears to the correct setting for Linux on the PR4100.