OpenWrt – Rev 1

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#!/bin/sh
# Copyright (C) 2013 OpenWrt.org

get_dt_led() {
        local label
        local ledpath
        local basepath="/proc/device-tree"
        local nodepath="$basepath/aliases/led-$1"

        [ -f "$nodepath" ] && ledpath=$(cat "$nodepath")
        [ -n "$ledpath" ] && \
                label=$(cat "$basepath$ledpath/label" 2>/dev/null) || \
                label=$(cat "$basepath$ledpath/chan-name" 2>/dev/null)

        echo "$label"
}

led_set_attr() {
        [ -f "/sys/class/leds/$1/$2" ] && echo "$3" > "/sys/class/leds/$1/$2"
}

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

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_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
}