#!/usr/bin/python
#
# tempwatchd.py - temperature watching daemon
# licensed under... well, do whatever you want. I do not care. 
# No warranty. Any kind of warranty. Use at your own risk. 
# Romano Giannetti <romano@dea.icai.upco.es>

import syslog
import sys
import time
import os

#
# file frm where we read the temp and to which we do the throtthling
# they will change in 2.6/2.7 cycle, but I think t should't be a big 
# deal to adapt it
#

tempfile="/proc/acpi/thermal_zone/THRM/temperature"
throttfile="/proc/acpi/processor/CPU0/throttling"

#
# This are the temperature thresholds. CPU will be "throttled own"
# to the T level specified in status_low if temperature reach upper_t, 
# and going back to full speed when it cools down to lower_t.
# If your system does not cool down, try using an higher T-level
#

upper_t=74
lower_t=72
status_low=4

#
# you shouldn't need to change anything here. If yes, please tell me
#
def read_temp():
    fin=open(tempfile,"r")
    a=float(fin.readline().split()[1])
    fin.close()
    return a

def set_state(num):
    os.system("echo -n %d > %s" % (num, throttfile))
    syslog.syslog(syslog.LOG_WARNING, "Processor state set to %d" % num)
    return


syslog.openlog("test.py",syslog.LOG_PID)

status=0 #normal run T0
syslog.syslog(syslog.LOG_WARNING, "Thermal control starting, temp=%f" % read_temp())

while 1:
    t=read_temp()
    if (status==0) and (t >= upper_t):
        syslog.syslog(syslog.LOG_WARNING, "Too hot: temp=%f" % t)
        set_state(status_low)
        status=status_low
    if (status==status_low) and (t>upper_t):
        syslog.syslog(syslog.LOG_CRIT, "WARNING, temperature running up: temp=%f" % t)
    if (status==status_low) and (t<=lower_t):
        syslog.syslog(syslog.LOG_WARNING, "Cooled down, temp=%f" % t)
        set_state(0)
        status=0
    time.sleep(2)

# never exit