/
fan_reading.go
110 lines (99 loc) · 2.36 KB
/
fan_reading.go
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package main
import (
"bufio"
"fmt"
"log"
"log/syslog"
"os"
"strconv"
"time"
)
func moduleExists() bool {
file, err := os.Open(FAN_PATH)
if err != nil {
fmt.Println("Error: thinkpad_acpi option fan_control is not enabled.")
return false
}
defer file.Close()
return true
}
func getTemp() uint16 {
var file *os.File
validPath := false
for _, path := range tempPaths {
var err error
file, err = os.Open(path)
if err != nil {
continue
}
validPath = true
}
if !validPath {
log.Fatal("Error: could not find temperature readings")
}
var read string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
read = scanner.Text()
}
temp, _ := strconv.Atoi(read)
return uint16(temp / 1000)
}
func getFanLevel(cfg *config, currTemp uint16, prevTemp uint16, prevLvl uint16) uint16 {
currLvl := prevLvl
temp_diff := currTemp - prevTemp
if temp_diff > 0 {
if currTemp <= cfg.incLowTemp {
currLvl = cfg.baseLvl
} else if currTemp <= cfg.incHighTemp {
currLvl = cfg.incLowLvl
} else if currTemp <= cfg.incMaxTemp {
currLvl = cfg.incHighLvl
} else {
currLvl = cfg.incMaxLvl
}
} else if temp_diff <= 0 {
if currTemp > cfg.decMaxTemp {
currLvl = cfg.decMaxLvl
} else if currTemp > cfg.decHighTemp {
currLvl = cfg.decHighLvl
} else if currTemp > cfg.decLowTemp {
currLvl = cfg.decLowLvl
} else {
currLvl = cfg.baseLvl
}
}
return currLvl
}
func setFanLevel(lvl uint16) {
lvlStr := "level " + strconv.Itoa(int(lvl))
file, err := os.OpenFile(FAN_PATH, os.O_WRONLY, 0600)
if err != nil {
log.Fatal("Error: could not open the fan path.")
}
defer file.Close()
_, err = file.Write([]byte(lvlStr))
if err != nil {
log.Fatal("Error: could not write to fan level.")
}
}
func fanControl(cfg *config, mainLogger *syslog.Writer) {
currTemp := getTemp()
prevTemp := currTemp
prevLvl := uint16(1)
currLvl := getFanLevel(cfg, currTemp, prevTemp, prevLvl)
for {
if prevLvl != currLvl {
setFanLevel(currLvl)
mainLogger.Debug(fmt.Sprintf("Fan level changed: %d -> %d (%d -> %d)",
prevLvl, currLvl, prevTemp, currTemp))
} else {
mainLogger.Debug(fmt.Sprintf("Fan level remained: %d (%d -> %d)", currLvl, prevTemp, currTemp))
}
time.Sleep(time.Second * time.Duration(cfg.pollInterval))
prevTemp = currTemp
currTemp = getTemp()
prevLvl = currLvl
currLvl = getFanLevel(cfg, currTemp, prevTemp, prevLvl)
}
}