1 # Copyright (c) 2014 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 import logging, os 7 import math 8 from autotest_lib.client.bin import utils, test 9 from autotest_lib.client.common_lib import error 10 11 12 class kernel_CrosECSysfsAccel(test.test): 13 '''Make sure the EC sysfs accel interface provides meaningful output''' 14 version = 1 15 16 17 # For EC accelerometer, define the number of counts in 1G, and the number 18 # of counts that the magnitude of each sensor is allowed to be off from a 19 # magnitude of 1G. These values are not sensor dependent, they are based 20 # on the EC sysfs interface, which specifies number of counts in 1G. 21 _ACCEL_1G = 1024 22 _ACCEL_MAG_VALID_OFFSET = 250 23 24 25 sysfs_accel_search_path = '/sys/bus/iio/devices' 26 sysfs_accel_path = '' 27 28 29 def _read_sysfs_accel_file(self, filename): 30 """ 31 Read the contents of the given accel sysfs file or fail 32 33 @param filename Name of the file within the accel sysfs interface 34 directory 35 """ 36 fullpath = os.path.join(self.sysfs_accel_path, filename) 37 38 try: 39 content = utils.read_file(fullpath) 40 except Exception as err: 41 raise error.TestFail('sysfs file problem: %s' % err) 42 return content 43 44 45 def _find_sysfs_accel_dir(self): 46 """ 47 Return the sysfs directory for accessing EC accels 48 """ 49 for _, dirs, _ in os.walk(self.sysfs_accel_search_path): 50 for d in dirs: 51 namepath = os.path.join(self.sysfs_accel_search_path, d, 'name') 52 53 try: 54 content = utils.read_file(namepath) 55 except IOError as err: 56 # errno 2 is code for file does not exist, which is ok 57 # here, just continue on to next directory. Any other 58 # error is a problem, raise an error. 59 if (err.errno == 2): 60 continue 61 raise error.TestFail('IOError %d while searching for accel' 62 'sysfs dir in %s', err.errno, namepath) 63 64 # Correct directory has a file called 'name' with contents 65 # 'cros-ec-accel' 66 if content.strip() == 'cros-ec-accel': 67 return os.path.join(self.sysfs_accel_search_path, d) 68 69 raise error.TestFail('No sysfs interface to EC accels (cros-ec-accel)') 70 71 72 def _verify_accel_data(self, name): 73 """ 74 Verify one of the EC accelerometers through the sysfs interface. 75 """ 76 x = int(self._read_sysfs_accel_file('in_accel_x_' + name + '_raw')) 77 y = int(self._read_sysfs_accel_file('in_accel_y_' + name + '_raw')) 78 z = int(self._read_sysfs_accel_file('in_accel_z_' + name + '_raw')) 79 mag = math.sqrt(x*x + y*y + z*z) 80 81 # Accel data is out of range if magnitude is not close to 1G. 82 # Note, this means test will fail on the moon. 83 if (abs(mag - self._ACCEL_1G) <= self._ACCEL_MAG_VALID_OFFSET): 84 logging.info("%s accel passed. Magnitude is %d.", name, mag) 85 else: 86 logging.info("%s accel bad data. Magnitude is %d, expected " 87 "%d +/-%d. Raw data is x:%d, y:%d, z:%d.", name, 88 mag, self._ACCEL_1G, self._ACCEL_MAG_VALID_OFFSET, 89 x, y, z) 90 raise error.TestFail("Accel magnitude out of range.") 91 92 93 def run_once(self): 94 """ 95 Check for accelerometers, and if present, check data is valid 96 """ 97 # First make sure that the motion sensors are active. If this 98 # check fails it means the EC motion sense task is not running and 99 # therefore not updating acceleration values in shared memory. 100 active = utils.system_output('ectool motionsense active') 101 if active == "0": 102 raise error.TestFail("Motion sensing is inactive") 103 104 # Find the iio sysfs directory for EC accels 105 self.sysfs_accel_path = self._find_sysfs_accel_dir() 106 logging.info("EC accelerometers found at %s", self.sysfs_accel_path) 107 108 # Get all accelerometer data 109 accel_info = utils.system_output('ectool motionsense') 110 info = accel_info.splitlines() 111 112 # If the base accelerometer is present, then verify data 113 if 'None' not in info[1]: 114 self._verify_accel_data('base') 115 116 # If the lid accelerometer is present, then verify data 117 if 'None' not in info[2]: 118 self._verify_accel_data('lid') 119
