N900 DBus monitory to increase CPU speed during VoIP calls

voipspdy.py

#! /usr/bin/python
import gobject
import dbus
import pyinotify
from dbus.mainloop.glib import DBusGMainLoop

class CpufreqController(pyinotify.ProcessEvent):
	minfreq = 125000

	def getMinfreq(self):
		return self.minfreq

	def setMinfreq(self, v):
		self.minfreq = v;
		if self.getSystemMinfreq() != v:
			self.setSystemMinfreq(v)

	def getSystemMinfreq(self):
		f = open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq', 'r')
		return int(f.read(), 10)

	def setSystemMinfreq(self, newFreq):
		f = open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq', 'w')
		f.write(str(newFreq))

	def process_IN_MODIFY(self, event):
		if self.getSystemMinfreq() < self.minfreq:
			self.setSystemMinfreq(self.minfreq)

class DbusHandler:
	def __init__(self, cpufreq):
		self.cpufreq = cpufreq;

	def call_request(self, _bus, msg):
		if not (msg.get_type() == 1 and msg.get_member() == 'call_request') and \
		   not (msg.get_type() == 4 and msg.get_member() == 'call_ended'):
			return

		args = msg.get_args_list()
		if args[0].find("sip") < 0:
			return		# don't care for non-sip connections

		if msg.get_member() == 'call_request':
			self.cpufreq.setMinfreq(600000)
		else:
			self.cpufreq.setMinfreq(125000)

if __name__ == '__main__':
	gobject.threads_init()
	DBusGMainLoop(set_as_default = True)
	freq = CpufreqController()

	wm = pyinotify.WatchManager()
	wm.add_watch('/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq', pyinotify.IN_MODIFY)
	notifier = pyinotify.ThreadedNotifier(wm, freq)
	notifier.start()

	bus = dbus.SessionBus()
	bus.add_match_string("interface='com.nokia.policy.telephony'")

	dbh = DbusHandler(freq)
	bus.add_message_filter(dbh.call_request)
	gobject.MainLoop().run()