1 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import logging, time 6 from autotest_lib.client.bin import test 7 from autotest_lib.client.bin import utils 8 from autotest_lib.client.cros.power import power_status 9 10 11 class power_Draw(test.test): 12 version = 1 13 14 15 def run_once(self, seconds=200, sleep=10): 16 status = power_status.get_status() 17 if status.on_ac(): 18 logging.warning('AC power is online -- ' 19 'unable to monitor energy consumption') 20 return 21 22 # If powerd is running, stop it, so that it cannot interfere with the 23 # backlight adjustments in this test. 24 if utils.system_output('status powerd').find('start/running') != -1: 25 powerd_running = True 26 utils.system_output('stop powerd') 27 else: 28 powerd_running = False 29 30 start_energy = status.battery[0].energy 31 self._tlog = power_status.TempLogger([], seconds_period=sleep) 32 self._tlog.start() 33 34 # Let the test run 35 for i in range(0, seconds, sleep): 36 time.sleep(sleep) 37 status.refresh() 38 39 status.refresh() 40 end_energy = status.battery[0].energy 41 42 consumed_energy = start_energy - end_energy 43 energy_rate = consumed_energy * 60 * 60 / seconds 44 45 keyvals = self._tlog.calc() 46 keyvals['wh_energy_full'] = status.battery[0].energy_full 47 keyvals['wh_start_energy'] = start_energy 48 keyvals['wh_end_energy'] = end_energy 49 keyvals['wh_consumed_energy'] = consumed_energy 50 keyvals['w_average_energy_rate'] = energy_rate 51 keyvals['w_end_energy_rate'] = status.battery[0].energy_rate 52 53 self.write_perf_keyval(keyvals) 54 55 # Restore powerd if it was originally running. 56 if powerd_running: 57 utils.system_output('start powerd'); 58
