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build/android/pylib/device/battery_utils.py

Index: build/android/pylib/device/battery_utils.py
diff --git a/build/android/pylib/device/battery_utils.py b/build/android/pylib/device/battery_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..eab558ea9a687685f0420de18827626c6955766a
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+++ b/build/android/pylib/device/battery_utils.py
@@ -0,0 +1,593 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Provides a variety of device interactions with power.
+"""
+# pylint: disable=unused-argument
+
+import collections
+import contextlib
+import csv
+import logging
+
+from pylib import constants
+from pylib.device import decorators
+from pylib.device import device_errors
+from pylib.device import device_utils
+from pylib.utils import timeout_retry
+
+_DEFAULT_TIMEOUT = 30
+_DEFAULT_RETRIES = 3
+
+
+_DEVICE_PROFILES = [
+  {
+    'name': 'Nexus 4',
+    'witness_file': '/sys/module/pm8921_charger/parameters/disabled',
+    'enable_command': (
+        'echo 0 > /sys/module/pm8921_charger/parameters/disabled && '
+        'dumpsys battery reset'),
+    'disable_command': (
+        'echo 1 > /sys/module/pm8921_charger/parameters/disabled && '
+        'dumpsys battery set ac 0 && dumpsys battery set usb 0'),
+    'charge_counter': None,
+    'voltage': None,
+    'current': None,
+  },
+  {
+    'name': 'Nexus 5',
+    # Nexus 5
+    # Setting the HIZ bit of the bq24192 causes the charger to actually ignore
+    # energy coming from USB. Setting the power_supply offline just updates the
+    # Android system to reflect that.
+    'witness_file': '/sys/kernel/debug/bq24192/INPUT_SRC_CONT',
+    'enable_command': (
+        'echo 0x4A > /sys/kernel/debug/bq24192/INPUT_SRC_CONT && '
+        'echo 1 > /sys/class/power_supply/usb/online &&'
+        'dumpsys battery reset'),
+    'disable_command': (
+        'echo 0xCA > /sys/kernel/debug/bq24192/INPUT_SRC_CONT && '
+        'chmod 644 /sys/class/power_supply/usb/online && '
+        'echo 0 > /sys/class/power_supply/usb/online && '
+        'dumpsys battery set ac 0 && dumpsys battery set usb 0'),
+    'charge_counter': None,
+    'voltage': None,
+    'current': None,
+  },
+  {
+    'name': 'Nexus 6',
+    'witness_file': None,
+    'enable_command': (
+        'echo 1 > /sys/class/power_supply/battery/charging_enabled && '
+        'dumpsys battery reset'),
+    'disable_command': (
+        'echo 0 > /sys/class/power_supply/battery/charging_enabled && '
+        'dumpsys battery set ac 0 && dumpsys battery set usb 0'),
+    'charge_counter': (
+        '/sys/class/power_supply/max170xx_battery/charge_counter_ext'),
+    'voltage': '/sys/class/power_supply/max170xx_battery/voltage_now',
+    'current': '/sys/class/power_supply/max170xx_battery/current_now',
+  },
+  {
+    'name': 'Nexus 9',
+    'witness_file': None,
+    'enable_command': (
+        'echo Disconnected > '
+        '/sys/bus/i2c/drivers/bq2419x/0-006b/input_cable_state && '
+        'dumpsys battery reset'),
+    'disable_command': (
+        'echo Connected > '
+        '/sys/bus/i2c/drivers/bq2419x/0-006b/input_cable_state && '
+        'dumpsys battery set ac 0 && dumpsys battery set usb 0'),
+    'charge_counter': '/sys/class/power_supply/battery/charge_counter_ext',
+    'voltage': '/sys/class/power_supply/battery/voltage_now',
+    'current': '/sys/class/power_supply/battery/current_now',
+  },
+  {
+    'name': 'Nexus 10',
+    'witness_file': None,
+    'enable_command': None,
+    'disable_command': None,
+    'charge_counter': None,
+    'voltage': '/sys/class/power_supply/ds2784-fuelgauge/voltage_now',
+    'current': '/sys/class/power_supply/ds2784-fuelgauge/current_now',
+
+  },
+]
+
+# The list of useful dumpsys columns.
+# Index of the column containing the format version.
+_DUMP_VERSION_INDEX = 0
+# Index of the column containing the type of the row.
+_ROW_TYPE_INDEX = 3
+# Index of the column containing the uid.
+_PACKAGE_UID_INDEX = 4
+# Index of the column containing the application package.
+_PACKAGE_NAME_INDEX = 5
+# The column containing the uid of the power data.
+_PWI_UID_INDEX = 1
+# The column containing the type of consumption. Only consumtion since last
+# charge are of interest here.
+_PWI_AGGREGATION_INDEX = 2
+# The column containing the amount of power used, in mah.
+_PWI_POWER_CONSUMPTION_INDEX = 5
+
+
+class BatteryUtils(object):
+
+  def __init__(self, device, default_timeout=_DEFAULT_TIMEOUT,
+               default_retries=_DEFAULT_RETRIES):
+    """BatteryUtils constructor.
+
+      Args:
+        device: A DeviceUtils instance.
+        default_timeout: An integer containing the default number of seconds to
+                         wait for an operation to complete if no explicit value
+                         is provided.
+        default_retries: An integer containing the default number or times an
+                         operation should be retried on failure if no explicit
+                         value is provided.
+
+      Raises:
+        TypeError: If it is not passed a DeviceUtils instance.
+    """
+    if not isinstance(device, device_utils.DeviceUtils):
+      raise TypeError('Must be initialized with DeviceUtils object.')
+    self._device = device
+    self._cache = device.GetClientCache(self.__class__.__name__)
+    self._default_timeout = default_timeout
+    self._default_retries = default_retries
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def SupportsFuelGauge(self, timeout=None, retries=None):
+    """Detect if fuel gauge chip is present.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Returns:
+      True if known fuel gauge files are present.
+      False otherwise.
+    """
+    self._DiscoverDeviceProfile()
+    return (self._cache['profile']['enable_command'] != None
+        and self._cache['profile']['charge_counter'] != None)
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetFuelGaugeChargeCounter(self, timeout=None, retries=None):
+    """Get value of charge_counter on fuel gauge chip.
+
+    Device must have charging disabled for this, not just battery updates
+    disabled. The only device that this currently works with is the nexus 5.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Returns:
+      value of charge_counter for fuel gauge chip in units of nAh.
+
+    Raises:
+      device_errors.CommandFailedError: If fuel gauge chip not found.
+    """
+    if self.SupportsFuelGauge():
+       return int(self._device.ReadFile(
+          self._cache['profile']['charge_counter']))
+    raise device_errors.CommandFailedError(
+        'Unable to find fuel gauge.')
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetNetworkData(self, package, timeout=None, retries=None):
+    """Get network data for specific package.
+
+    Args:
+      package: package name you want network data for.
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Returns:
+      Tuple of (sent_data, recieved_data)
+      None if no network data found
+    """
+    # If device_utils clears cache, cache['uids'] doesn't exist
+    if 'uids' not in self._cache:
+      self._cache['uids'] = {}
+    if package not in self._cache['uids']:
+      self.GetPowerData()
+      if package not in self._cache['uids']:
+        logging.warning('No UID found for %s. Can\'t get network data.',
+                        package)
+        return None
+
+    network_data_path = '/proc/uid_stat/%s/' % self._cache['uids'][package]
+    try:
+      send_data = int(self._device.ReadFile(network_data_path + 'tcp_snd'))
+    # If ReadFile throws exception, it means no network data usage file for
+    # package has been recorded. Return 0 sent and 0 received.
+    except device_errors.AdbShellCommandFailedError:
+      logging.warning('No sent data found for package %s', package)
+      send_data = 0
+    try:
+      recv_data = int(self._device.ReadFile(network_data_path + 'tcp_rcv'))
+    except device_errors.AdbShellCommandFailedError:
+      logging.warning('No received data found for package %s', package)
+      recv_data = 0
+    return (send_data, recv_data)
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetPowerData(self, timeout=None, retries=None):
+    """Get power data for device.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Returns:
+      Dict of power data, keyed on package names.
+      {
+        package_name: {
+          'uid': uid,
+          'data': [1,2,3]
+        },
+      }
+    """
+    if 'uids' not in self._cache:
+      self._cache['uids'] = {}
+    dumpsys_output = self._device.RunShellCommand(
+        ['dumpsys', 'batterystats', '-c'], check_return=True)
+    csvreader = csv.reader(dumpsys_output)
+    pwi_entries = collections.defaultdict(list)
+    for entry in csvreader:
+      if entry[_DUMP_VERSION_INDEX] not in ['8', '9']:
+        # Wrong dumpsys version.
+        raise device_errors.DeviceVersionError(
+            'Dumpsys version must be 8 or 9. %s found.'
+            % entry[_DUMP_VERSION_INDEX])
+      if _ROW_TYPE_INDEX < len(entry) and entry[_ROW_TYPE_INDEX] == 'uid':
+        current_package = entry[_PACKAGE_NAME_INDEX]
+        if (self._cache['uids'].get(current_package)
+            and self._cache['uids'].get(current_package)
+            != entry[_PACKAGE_UID_INDEX]):
+          raise device_errors.CommandFailedError(
+              'Package %s found multiple times with differnt UIDs %s and %s'
+               % (current_package, self._cache['uids'][current_package],
+               entry[_PACKAGE_UID_INDEX]))
+        self._cache['uids'][current_package] = entry[_PACKAGE_UID_INDEX]
+      elif (_PWI_POWER_CONSUMPTION_INDEX < len(entry)
+          and entry[_ROW_TYPE_INDEX] == 'pwi'
+          and entry[_PWI_AGGREGATION_INDEX] == 'l'):
+        pwi_entries[entry[_PWI_UID_INDEX]].append(
+            float(entry[_PWI_POWER_CONSUMPTION_INDEX]))
+
+    return {p: {'uid': uid, 'data': pwi_entries[uid]}
+            for p, uid in self._cache['uids'].iteritems()}
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetPackagePowerData(self, package, timeout=None, retries=None):
+    """Get power data for particular package.
+
+    Args:
+      package: Package to get power data on.
+
+    returns:
+      Dict of UID and power data.
+      {
+        'uid': uid,
+        'data': [1,2,3]
+      }
+      None if the package is not found in the power data.
+    """
+    return self.GetPowerData().get(package)
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetBatteryInfo(self, timeout=None, retries=None):
+    """Gets battery info for the device.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+    Returns:
+      A dict containing various battery information as reported by dumpsys
+      battery.
+    """
+    result = {}
+    # Skip the first line, which is just a header.
+    for line in self._device.RunShellCommand(
+        ['dumpsys', 'battery'], check_return=True)[1:]:
+      # If usb charging has been disabled, an extra line of header exists.
+      if 'UPDATES STOPPED' in line:
+        logging.warning('Dumpsys battery not receiving updates. '
+                        'Run dumpsys battery reset if this is in error.')
+      elif ':' not in line:
+        logging.warning('Unknown line found in dumpsys battery: "%s"', line)
+      else:
+        k, v = line.split(':', 1)
+        result[k.strip()] = v.strip()
+    return result
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def GetCharging(self, timeout=None, retries=None):
+    """Gets the charging state of the device.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+    Returns:
+      True if the device is charging, false otherwise.
+    """
+    battery_info = self.GetBatteryInfo()
+    for k in ('AC powered', 'USB powered', 'Wireless powered'):
+      if (k in battery_info and
+          battery_info[k].lower() in ('true', '1', 'yes')):
+        return True
+    return False
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def SetCharging(self, enabled, timeout=None, retries=None):
+    """Enables or disables charging on the device.
+
+    Args:
+      enabled: A boolean indicating whether charging should be enabled or
+        disabled.
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      device_errors.CommandFailedError: If method of disabling charging cannot
+        be determined.
+    """
+    self._DiscoverDeviceProfile()
+    if not self._cache['profile']['enable_command']:
+      raise device_errors.CommandFailedError(
+          'Unable to find charging commands.')
+
+    if enabled:
+      command = self._cache['profile']['enable_command']
+    else:
+      command = self._cache['profile']['disable_command']
+
+    def set_and_verify_charging():
+      self._device.RunShellCommand(command, check_return=True)
+      return self.GetCharging() == enabled
+
+    timeout_retry.WaitFor(set_and_verify_charging, wait_period=1)
+
+  # TODO(rnephew): Make private when all use cases can use the context manager.
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def DisableBatteryUpdates(self, timeout=None, retries=None):
+    """Resets battery data and makes device appear like it is not
+    charging so that it will collect power data since last charge.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      device_errors.CommandFailedError: When resetting batterystats fails to
+        reset power values.
+      device_errors.DeviceVersionError: If device is not L or higher.
+    """
+    def battery_updates_disabled():
+      return self.GetCharging() is False
+
+    self._ClearPowerData()
+    self._device.RunShellCommand(['dumpsys', 'battery', 'set', 'ac', '0'],
+                                 check_return=True)
+    self._device.RunShellCommand(['dumpsys', 'battery', 'set', 'usb', '0'],
+                                 check_return=True)
+    timeout_retry.WaitFor(battery_updates_disabled, wait_period=1)
+
+  # TODO(rnephew): Make private when all use cases can use the context manager.
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def EnableBatteryUpdates(self, timeout=None, retries=None):
+    """Restarts device charging so that dumpsys no longer collects power data.
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      device_errors.DeviceVersionError: If device is not L or higher.
+    """
+    def battery_updates_enabled():
+      return (self.GetCharging()
+              or not bool('UPDATES STOPPED' in self._device.RunShellCommand(
+                  ['dumpsys', 'battery'], check_return=True)))
+
+    self._device.RunShellCommand(['dumpsys', 'battery', 'reset'],
+                                 check_return=True)
+    timeout_retry.WaitFor(battery_updates_enabled, wait_period=1)
+
+  @contextlib.contextmanager
+  def BatteryMeasurement(self, timeout=None, retries=None):
+    """Context manager that enables battery data collection. It makes
+    the device appear to stop charging so that dumpsys will start collecting
+    power data since last charge. Once the with block is exited, charging is
+    resumed and power data since last charge is no longer collected.
+
+    Only for devices L and higher.
+
+    Example usage:
+      with BatteryMeasurement():
+        browser_actions()
+        get_power_data() # report usage within this block
+      after_measurements() # Anything that runs after power
+                           # measurements are collected
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      device_errors.DeviceVersionError: If device is not L or higher.
+    """
+    if (self._device.build_version_sdk <
+        constants.ANDROID_SDK_VERSION_CODES.LOLLIPOP):
+      raise device_errors.DeviceVersionError('Device must be L or higher.')
+    try:
+      self.DisableBatteryUpdates(timeout=timeout, retries=retries)
+      yield
+    finally:
+      self.EnableBatteryUpdates(timeout=timeout, retries=retries)
+
+  def ChargeDeviceToLevel(self, level, wait_period=60):
+    """Enables charging and waits for device to be charged to given level.
+
+    Args:
+      level: level of charge to wait for.
+      wait_period: time in seconds to wait between checking.
+    """
+    self.SetCharging(True)
+
+    def device_charged():
+      battery_level = self.GetBatteryInfo().get('level')
+      if battery_level is None:
+        logging.warning('Unable to find current battery level.')
+        battery_level = 100
+      else:
+        logging.info('current battery level: %s', battery_level)
+        battery_level = int(battery_level)
+      return battery_level >= level
+
+    timeout_retry.WaitFor(device_charged, wait_period=wait_period)
+
+  def LetBatteryCoolToTemperature(self, target_temp, wait_period=60):
+    """Lets device sit to give battery time to cool down
+    Args:
+      temp: maximum temperature to allow in tenths of degrees c.
+      wait_period: time in seconds to wait between checking.
+    """
+    def cool_device():
+      temp = self.GetBatteryInfo().get('temperature')
+      if temp is None:
+        logging.warning('Unable to find current battery temperature.')
+        temp = 0
+      else:
+        logging.info('Current battery temperature: %s', temp)
+      return int(temp) <= target_temp
+    self.EnableBatteryUpdates()
+    logging.info('Waiting for the device to cool down to %s (0.1 C)',
+                 target_temp)
+    timeout_retry.WaitFor(cool_device, wait_period=wait_period)
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def TieredSetCharging(self, enabled, timeout=None, retries=None):
+    """Enables or disables charging on the device.
+
+    Args:
+      enabled: A boolean indicating whether charging should be enabled or
+        disabled.
+      timeout: timeout in seconds
+      retries: number of retries
+    """
+    if self.GetCharging() == enabled:
+      logging.warning('Device charging already in expected state: %s', enabled)
+      return
+
+    if enabled:
+      try:
+        self.SetCharging(enabled)
+      except device_errors.CommandFailedError:
+        logging.info('Unable to enable charging via hardware.'
+                     ' Falling back to software enabling.')
+        self.EnableBatteryUpdates()
+    else:
+      try:
+        self._ClearPowerData()
+        self.SetCharging(enabled)
+      except device_errors.CommandFailedError:
+        logging.info('Unable to disable charging via hardware.'
+                     ' Falling back to software disabling.')
+        self.DisableBatteryUpdates()
+
+  @contextlib.contextmanager
+  def PowerMeasurement(self, timeout=None, retries=None):
+    """Context manager that enables battery power collection.
+
+    Once the with block is exited, charging is resumed. Will attempt to disable
+    charging at the hardware level, and if that fails will fall back to software
+    disabling of battery updates.
+
+    Only for devices L and higher.
+
+    Example usage:
+      with PowerMeasurement():
+        browser_actions()
+        get_power_data() # report usage within this block
+      after_measurements() # Anything that runs after power
+                           # measurements are collected
+
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+    """
+    try:
+      self.TieredSetCharging(False, timeout=timeout, retries=retries)
+      yield
+    finally:
+      self.TieredSetCharging(True, timeout=timeout, retries=retries)
+
+  def _ClearPowerData(self):
+    """Resets battery data and makes device appear like it is not
+    charging so that it will collect power data since last charge.
+
+    Returns:
+      True if power data cleared.
+      False if power data clearing is not supported (pre-L)
+
+    Raises:
+      device_errors.DeviceVersionError: If power clearing is supported,
+        but fails.
+    """
+    if (self._device.build_version_sdk <
+        constants.ANDROID_SDK_VERSION_CODES.LOLLIPOP):
+      logging.warning('Dumpsys power data only available on 5.0 and above. '
+                      'Cannot clear power data.')
+      return False
+
+    self._device.RunShellCommand(
+        ['dumpsys', 'battery', 'set', 'usb', '1'], check_return=True)
+    self._device.RunShellCommand(
+        ['dumpsys', 'battery', 'set', 'ac', '1'], check_return=True)
+    self._device.RunShellCommand(
+        ['dumpsys', 'batterystats', '--reset'], check_return=True)
+    battery_data = self._device.RunShellCommand(
+        ['dumpsys', 'batterystats', '--charged', '--checkin'],
+        check_return=True, large_output=True)
+    for line in battery_data:
+      l = line.split(',')
+      if (len(l) > _PWI_POWER_CONSUMPTION_INDEX and l[_ROW_TYPE_INDEX] == 'pwi'
+          and l[_PWI_POWER_CONSUMPTION_INDEX] != 0):
+        self._device.RunShellCommand(
+            ['dumpsys', 'battery', 'reset'], check_return=True)
+        raise device_errors.CommandFailedError(
+            'Non-zero pmi value found after reset.')
+    self._device.RunShellCommand(
+        ['dumpsys', 'battery', 'reset'], check_return=True)
+    return True
+
+  def _DiscoverDeviceProfile(self):
+    """Checks and caches device information.
+
+    Returns:
+      True if profile is found, false otherwise.
+    """
+
+    if 'profile' in self._cache:
+      return True
+    for profile in _DEVICE_PROFILES:
+      if self._device.product_model == profile['name']:
+        self._cache['profile'] = profile
+        return True
+    self._cache['profile'] = {
+        'name': None,
+        'witness_file': None,
+        'enable_command': None,
+        'disable_command': None,
+        'charge_counter': None,
+        'voltage': None,
+        'current': None,
+    }
+    return False