piframe-go/cmd/fan/fan.go

package main

import (
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	argonFan "git.sungo.io/sungo/argon/fan"

	"git.kemonine.info/PiFrame/utils"
)

const (
	BUS     = 1
	ADDRESS = 0x1a
)

const (
	POLL_INTERVAL                   = "1m"
	SPEED_OFF_TEMP                  = 40.0
	SPEED_TWENTY_FIVE_PERCENT_TEMP  = 45.0
	SPEED_FIFTY_PERCENT_TEMP        = 50.0
	SPEED_SEVENTY_FIVE_PERCENT_TEMP = 55.0
	SPEED_FULL_TEMP                 = 57.0
)

func main() {
	// Setup fan and bail if we can't see it
	fan, err := argonFan.New(ADDRESS, BUS)
	if err != nil {
		log.Fatalf("Error working with fan : %s", err)
	}

	// Safe exit
	defer fan.SafeClose()
	sigc := make(chan os.Signal, 1)
	signal.Notify(
		sigc,
		syscall.SIGHUP,
		syscall.SIGINT,
		syscall.SIGTERM,
		syscall.SIGQUIT,
	)
	go func() {
		<-sigc
		fan.SafeClose()
		os.Exit(1)
	}()

	// Control fan speed based on temps via a ticker / timeout
	pollInterval, err := time.ParseDuration(POLL_INTERVAL)
	if err != nil {
		log.Fatalf("Error parsing interval duration : %s", err)
	}
	ticker := time.NewTicker(pollInterval)
	for range ticker.C {
		cpuTemp := utils.GetCPUTemp()
		gpuTemp := utils.GetGPUTemp()

		log.Printf("CPU Temp : %.2f", cpuTemp)
		log.Printf("GPU Temp : %.2f", gpuTemp)

		if cpuTemp >= SPEED_FULL_TEMP || gpuTemp >= SPEED_FULL_TEMP {
			fan.SetSpeed(100)
			log.Print("Setting fan speed to 100%")
			continue
		}
		if cpuTemp >= SPEED_SEVENTY_FIVE_PERCENT_TEMP || gpuTemp >= SPEED_SEVENTY_FIVE_PERCENT_TEMP {
			fan.SetSpeed(75)
			log.Print("Setting fan speed to 75%")
			continue
		}
		if cpuTemp >= SPEED_FIFTY_PERCENT_TEMP || gpuTemp >= SPEED_FIFTY_PERCENT_TEMP {
			fan.SetSpeed(50)
			log.Print("Setting fan speed to 50%")
			continue
		}
		if cpuTemp >= SPEED_TWENTY_FIVE_PERCENT_TEMP || gpuTemp >= SPEED_TWENTY_FIVE_PERCENT_TEMP {
			fan.SetSpeed(25)
			log.Print("Setting fan speed to 25%")
			continue
		}
		if cpuTemp <= SPEED_OFF_TEMP || gpuTemp <= SPEED_OFF_TEMP {
			fan.SetSpeed(0)
			log.Print("Setting fan speed to 0%")
			continue
		}
		// We should never get here but...
		log.Print("Shouldn't see this but here we are")
		fan.SetSpeed(100)
	}
}