leds.sh supporting multiple leds

# Copyright (C) 2013 OpenWrt.org

get_dt_led_path() {
    local basepath="/proc/device-tree"
    local nodepath="$basepath/aliases/led-$1"
    local ledlist

    for ledpath in $(ls -1 "$nodepath"* 2>/dev/null); do
        [ -f "$ledpath" ] && ledpath=$(cat "$ledpath")
        [ -n "$ledpath" ] && ledpath="$basepath$ledpath"
        ledlist="${ledlist} ${ledpath}"
    done

    echo "$ledlist" | sed 's/ /\n/g' | sort | uniq
}

get_dt_led() {
    local label
    local ledpaths=$(get_dt_led_path $1 | sed 's/ /\n/g')
    local ledpathlist

    for ledpath in ${ledpaths}; do
        [ -n "$ledpath" ] && \
            label=$(cat "$ledpath/label" 2>/dev/null) || \
            label=$(cat "$ledpath/chan-name" 2>/dev/null) || \
            label=$(basename "$ledpath")
        ledpathlist="${ledpathlist} ${label}"
    done

    echo "$ledpathlist" | awk '{$1=$1};1'
}

led_set_attr() {
    for ledpath in $(echo "$1" | sed 's/ /\n/g'); do
        [ -f "/sys/class/leds/$ledpath/$2" ] && echo "$3" > "/sys/class/leds/$ledpath/$2"
    done
}

led_timer() {
    led_set_attr "${1}" "delay_on" "$2"
    led_set_attr "${1}" "delay_off" "$3"
    led_set_attr "${1}" "trigger" "timer"
}

led_on() {
    led_set_attr "${1}" "trigger" "none"
    led_set_attr "${1}" "brightness" 255
}

led_off() {
    led_set_attr "${1}" "trigger" "none"
    led_set_attr "${1}" "brightness" 0
}

status_led_restore_trigger() {
    local trigger
    local ledpaths=$(get_dt_led_path $1 | sed 's/ /\n/g')

    for ledpath in ${ledpaths}; do
        [ -n "$ledpath" ] && \
            trigger=$(cat "$ledpath/linux,default-trigger" 2>/dev/null)

        [ -n "$trigger" ] && \
            led_set_attr "$(get_dt_led $1)" "trigger" "$trigger"
    done
}

status_led_set_timer() {
    led_timer "${status_led}" "$1" "$2"
    [ -n "$status_led2" ] && led_timer $status_led2 "$1" "$2"
}

status_led_set_heartbeat() {
    led_set_attr "${status_led}" "trigger" "heartbeat"
}

status_led_on() {
    led_on "${status_led}"
    [ -n "$status_led2" ] && led_on $status_led2
}

status_led_off() {
    led_off "${status_led}"
    [ -n "$status_led2" ] && led_off $status_led2
}

status_led_blink_slow() {
    led_timer "${status_led}" 1000 1000
}

status_led_blink_fast() {
    led_timer "${status_led}" 100 100
}

status_led_blink_preinit() {
    led_timer "${status_led}" 100 100
}

status_led_blink_failsafe() {
    led_timer "${status_led}" 50 50
}

status_led_blink_preinit_regular() {
    led_timer "${status_led}" 200 200
}