kotel

#!/bin/bash

RELAY_A=24
RELAY_B=23
RELAY_C=17
RELAY_D=22

GPIO_PATH="/sys/class/gpio/"

function is_initialized {
    if [[ -d ${GPIO_PATH}/gpio${RELAY_A} ]]; then
        if [[ -d ${GPIO_PATH}/gpio${RELAY_B} ]]; then
            return 0
        fi
    fi
    return 1
}

function initialize {
    # If we are already did the initialization, then ignore this
    if is_initialized; then
        return 0
    fi

    # Initialize the relay ports
    (echo ${RELAY_A} > ${GPIO_PATH}/export) 2> /dev/null
    (echo ${RELAY_B} > ${GPIO_PATH}/export) 2> /dev/null

    echo out > ${GPIO_PATH}/gpio${RELAY_A}/direction
    echo out > ${GPIO_PATH}/gpio${RELAY_B}/direction
}

function start_kotel {
    echo 1 > ${GPIO_PATH}/gpio${RELAY_A}/value
    echo 1 > ${GPIO_PATH}/gpio${RELAY_B}/value
}

function stop_kotel {
    echo 1 > ${GPIO_PATH}/gpio${RELAY_A}/value
    echo 0 > ${GPIO_PATH}/gpio${RELAY_B}/value
}

function manual_kotel {
    echo 0 > ${GPIO_PATH}/gpio${RELAY_A}/value
    echo 0 > ${GPIO_PATH}/gpio${RELAY_B}/value
}

function status_kotel {
    A=$(cat ${GPIO_PATH}/gpio${RELAY_A}/value)
    B=$(cat ${GPIO_PATH}/gpio${RELAY_B}/value)

    if [[ ${B} -ne 0 ]]; then
            echo "started"
            return 0
    fi
    if [[ ${A} -ne 0 ]]; then
            echo "stopped"
            return 0
    fi
    echo "manual"
    return 0
}

function print_help {
    echo "Usage:"
    echo "  $(basename $0) start|stop|manual|status"
}

# Parse argument
case "$1" in
    start*)
        initialize
        start_kotel
        ;;
    stop*)
        initialize
        stop_kotel
        ;;
    manual)
        initialize
        manual_kotel
        ;;
    ""|status)
        initialize
        status_kotel
        ;;
    *)
        print_help
        exit 1
        ;;
esac
exit 0