1 # Copyright (c) 2011 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 6 # DESCRIPTION : 7 # 8 # This is a hardware test for system fan. The test first sets the fan to max 9 # speed, turns off the fan, and then sets to 50% speed. The test sleeps for a 10 # few seconds after setting the fan speed, which allows the fan some time to 11 # spin up/down and ensures the correctness of the test. The test restores fan 12 # setting when finished. This test uses mosys to read and control fan settings. 13 14 15 import re 16 import time 17 18 from autotest_lib.client.bin import test, utils 19 from autotest_lib.client.common_lib import error 20 21 22 class FanControl(object): 23 MOSYS_OUTPUT_RE = re.compile('(\w+)="(.*?)"') 24 25 def __init__(self, fan_name='system'): 26 self._fan_name = fan_name 27 28 def get_values(self): 29 values = {} 30 cmd = 'mosys -k sensor print fantach %s' % self._fan_name 31 for kv in self.MOSYS_OUTPUT_RE.finditer(utils.system_output(cmd)): 32 key, value = kv.groups() 33 if key == 'reading': 34 value = int(value) 35 values[key] = value 36 return values 37 38 def get_mode(self): 39 return self.get_values()['mode'] 40 41 def get_reading(self): 42 return self.get_values()['reading'] 43 44 def set_percent(self, percent): 45 cmd = 'mosys sensor set fantach %s %s' % (self._fan_name, percent) 46 utils.system_output(cmd) 47 48 49 class hardware_Fan(test.test): 50 version = 1 51 DELAY = 3 52 53 def run_once(self): 54 fan = FanControl() 55 original_values = fan.get_values() 56 max_reading = 0 57 58 try: 59 fan.set_percent('100') 60 time.sleep(self.DELAY) 61 if fan.get_mode() != 'manual': 62 raise error.TestError('Unable to manually set fan speed') 63 if fan.get_reading() == 0: 64 raise error.TestError('Fan cannot be turned on') 65 max_reading = fan.get_reading() 66 67 fan.set_percent('off') 68 time.sleep(self.DELAY) 69 if fan.get_reading() != 0: 70 raise error.TestError('Unable to turn off fan') 71 72 fan.set_percent('50') 73 time.sleep(self.DELAY) 74 if not 0 < fan.get_reading() < max_reading: 75 raise error.TestError('Fan speed not in reasonable range') 76 finally: 77 if original_values['mode'] == 'manual' and max_reading > 0: 78 fan.set_percent(100 * original_values['reading'] / max_reading) 79 else: 80 fan.set_percent('auto') 81
