Control the fan in ASUS laptops via ACPI

arch-asus-fancontrol.py

#!/usr/bin/env python2

import sys
import os

def call_acpi(command):
    with open('/proc/acpi/call', 'w') as acpi_call:
        acpi_call.write(command)
    
    # Response
    with open('/proc/acpi/call', 'r') as acpi_call:
        return acpi_call.read()

def set_fan(speed, fan=1):
    if speed < 0:
        speed = 0
    elif speed > 100:
        speed = 100

    raw_speed = round(speed * 2.55)
    call_acpi('\_SB.PCI0.SBRG.EC0.SFNV %d %s' % (fan, raw_speed))
    
    print 'Set fan speed to %d %%' % speed
    
def get_cpu_temp():
    return int(call_acpi('\_SB.PCI0.SBRG.EC0.ECPU')[:4], 16)

def cleanup(signal=None, frame=None):
    call_acpi('\_SB.PCI0.SBRG.EC0.SFNV 0 0')
    call_acpi('\_SB.ATKD.QMOD 0x02')
    
    print 'Reset fan control to automatic. Exiting...'

if __name__=='__main__':
    uid = os.geteuid()

    if uid == 0: 
        if len(sys.argv) == 2: 
            if sys.argv[1] == "auto": 
                cleanup()
            else: 
                set_fan(float(sys.argv[1]))
        else: 
            print "Usage: fan speed|auto"
    else: 
        os.system("sudo " + " ".join(sys.argv))