#!/bin/bash
########################################################################
# filename:	fan_ctrl	(PTT Supervision only -
#				See fan_ctrl2 for PTT & COS supervision)
#
# description:	This script is used to run in the background and will
#               count the time PTT line is active.  If active for more
#               that a preset time, fan will turn on.  PTT must then be
#               off for another preset time before fan is shut down.  A
#               locking mechanism is provided to keep fan running until
#               told to shutdown. 'touch $LOCAL/fan_lock' will start the
#               fan and hold it until 'rm -f $LOCAL/fan_lock' is done.
#               As these flags are in ramdisk, reboot will clear them.
#
#         ** Add script to startup file to run always as follows
#   ###################################################################
#   # edit file "~/custom/rc.irlp" as user repeater....               #
#   # Add these lines..                                               #
#   #    echo -n "Enabling cooling fan process... "                   #
#   #    /bin/su - -c "$CUSTOM/fan_ctrl" repeater >&/dev/null 2>&1 &  #
#   #    echo "(in background) done!"                                 #
#   #                                                                 #
#   ###################################################################
#
# arguments:	always.. but not with me!
#
# flags:        $LOCAL/fanrun   - flag is present whilst fan running.
#               $LOCAL/fan_lock - is present to lock fan ON
#                   (set and cleared by outside app)
#
# history:
# 20090704  V1.00    vk8sj  Original ...
# 20100228  V1.01    vk8sj  Added lock option
# 20110126  V1.02    vk8sj  Few mods to reduce CPU load when idle
# 20110820  V1.03    vk8sj  Mods to locking option
#
#
########################################################################
#
# test user & load environment
#
if [ `/usr/bin/whoami` != "repeater" ] ; then
	echo This program must be run as user REPEATER!
	exit 1
fi
. /home/irlp/custom/environment
#
tictoc_start=15                                         # PTT up for n seconds to start fan
tictoc_stop=30                                          # Overhang till off (n again)
fanon="aux3on"                                          # where is fan connected?
fanoff="aux3off"                                        #  (aux1, 2 or 3...)
#
rm -f $LOCAL/fanrun                                     # make sure flag file cleared
rm -f $LOCAL/fan_lock                                   # make sure lock removed
$fanoff                                                 # make sure fan is off now
echo "Fan Control Started.."

# Let's begin...

while true; do                                          # create endless loop
    if ! $BIN/pttstate ; then                           # wait for PTT active..
        echo "PTT Detected."                            # DEBUG ONLY - Test
        tictoc=0                                        # init var for loops
        while ! $BIN/pttstate ; do                      # if PTT still active..
            let tictoc+=1                               # crank counter
            echo "Start Timer - "$tictoc
            sleep 1                                     # Take a nap (Short!)
            if [ $tictoc -gt $tictoc_start ] ; then     # time up yet?
                $fanon                                  # fire up fan
                touch $LOCAL/fanrun                     # set flag active
                echo "Fan - ON."                        # DEBUG ONLY - test.
                break                                   # crash out of loop
            fi
        done                                            # loop till it drops or breaks
        if [ ! -f $LOCAL/fanrun ] ; then
            echo "PTT Dropped. - Timer "$tictoc         # DEBUG ONLY - Test.
        fi
        tictoc=0                                        # reset var to loop again
        while [ $tictoc -le $tictoc_stop ] ; do
            if [ ! -f $LOCAL/fanrun ] ; then
                break
            fi
            if ! $BIN/pttstate ; then                   # tx back up again..
                echo "Reset & hold. Timer "$tictoc      # DEBUG ONLY - Test.
                tictoc=0                                # reset counter
                while ! $BIN/pttstate ; do              # loop till PTT off
                    sleep 1                             # zzzzzzz
                done                                    # do nothing (good at that!)
                echo "Counting..."                      # DEBUG ONLY - Test.
            fi
            sleep 1
            let tictoc+=1                               # crank up the counter
            echo "Rundown Timer - "$tictoc
        done
        if [ -f $LOCAL/fanrun ] ; then                  # If the fan is running..
            if [ ! -f $LOCAL/fan_lock ] ; then
                $fanoff                                 # Kill fan if not locked on
                echo "Fan - OFF."
                rm -f $LOCAL/fanrun                     # remove test flag
            else
                echo "Fan - locked on, Waiting"         # DEBUG ONLY - test.
                while [ -f $LOCAL/fan_lock ] ; do       # wait for lock removal
                    sleep 1                             # zzzzzzz a sec..
                done
                $fanoff                                 # nuke breeze..
                echo "Lock removed.. FAN - OFF."
                rm -f $LOCAL/fanrun                     # remove flag
            fi
        fi
    fi
    if [ -f $LOCAL/fan_lock ] ; then                    # look for lock-on flag, fan stopped
        echo "Fan_Lock detected.. FAN - ON."
        $fanon                                          # Go! - Blow!
        touch $LOCAL/fanrun                             # Signal fan running
        while [ -f $LOCAL/fan_lock ] ; do               # wait for lock removal
            sleep 1                                     # zzzzzzz a sec..
        done
        $fanoff                                         # nuke breeze..
        echo "Lock removed.. FAN - OFF."
        rm -f $LOCAL/fanrun                             # remove flag
    fi
sleep 1
done                                                    # continue endless loop
echo "What? - Should never get here!!"
exit 1                                                  # should never get here!!