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      1 # Copyright 2016 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
      6 import time
      7 
      8 from autotest_lib.client.bin import test
      9 from autotest_lib.client.bin import utils
     10 from autotest_lib.client.common_lib import error
     11 from autotest_lib.client.common_lib.cros import chrome
     12 from autotest_lib.client.cros.graphics import graphics_utils
     13 from autotest_lib.client.cros.input_playback import input_playback
     14 
     15 BRIGHTNESS_LEVELS = 16
     16 
     17 class platform_InputBrightness(test.test):
     18     """Tests if device suspends using shortcut keys."""
     19     version = 1
     20     BRIGHTNESS_CMD = "backlight_tool --get_brightness_percent"
     21     RESET_BRIGHTNESS_CMD = "backlight_tool --set_brightness_percent=70.0"
     22     WAIT_TIME = 1
     23 
     24     def warmup(self):
     25         """Test setup."""
     26         # Emulate keyboard.
     27         # See input_playback. The keyboard is used to play back shortcuts.
     28         self._player = input_playback.InputPlayback()
     29         self._player.emulate(input_type='keyboard')
     30         self._player.find_connected_inputs()
     31 
     32     def test_brightness_down(self, verify_brightness=True):
     33         """
     34         Use keyboard shortcut to test brightness Down (F6) key.
     35 
     36         @raises: error.TestFail if system brightness did not decrease.
     37 
     38         """
     39         for level in range(0, BRIGHTNESS_LEVELS):
     40             logging.debug("Decreasing the brightness. Level %s", level)
     41             sys_brightness = self.get_system_brightness()
     42             self._player.blocking_playback_of_default_file(
     43                 input_type='keyboard', filename='keyboard_f6')
     44             time.sleep(self.WAIT_TIME)
     45             if verify_brightness:
     46                 if not sys_brightness > self.get_system_brightness():
     47                     raise error.TestFail("Brightness did not decrease from: "
     48                                          "%s" % sys_brightness)
     49 
     50     def test_brightness_up(self, verify_brightness=True):
     51         """
     52         Use keyboard shortcut to test brightness Up (F7) key.
     53 
     54         @raises: error.TestFail if system brightness did not increase.
     55 
     56         """
     57         for level in range(0, BRIGHTNESS_LEVELS):
     58             logging.debug("Increasing the brightness. Level %s", level)
     59             sys_brightness = self.get_system_brightness()
     60             self._player.blocking_playback_of_default_file(
     61                 input_type='keyboard', filename='keyboard_f7')
     62             time.sleep(self.WAIT_TIME)
     63             if verify_brightness:
     64                 if not sys_brightness < self.get_system_brightness():
     65                     raise error.TestFail("Brightness did not increase from: "
     66                                          "%s" % sys_brightness)
     67 
     68     def get_system_brightness(self):
     69         """
     70         Get current system brightness percent (0.0-100.0).
     71 
     72         @returns: current system brightness.
     73         """
     74         sys_brightness = utils.system_output(self.BRIGHTNESS_CMD)
     75         return float(sys_brightness)
     76 
     77 
     78     def run_once(self):
     79         """
     80         Open browser, and affect brightness using  up and down functions.
     81 
     82         @raises: error.TestFail if brightness keys (F6/F7) did not work.
     83 
     84         """
     85         # Check for internal_display
     86         if not graphics_utils.has_internal_display():
     87             raise error.TestNAError('Test can not proceed on '
     88                                     'devices without internal display.')
     89         with chrome.Chrome():
     90             logging.info("Increasing the initial brightness to max without "
     91                          "verifying brightness.")
     92             # Not using command to set max brightness because
     93             # the brightness button stays at the current level
     94             # only irrespective of the command
     95             self.test_brightness_up(verify_brightness=False)
     96             # Actual test starts from here.
     97             self.test_brightness_down(verify_brightness=True)
     98             self.test_brightness_up(verify_brightness=True)
     99 
    100 
    101     def cleanup(self):
    102         """Test cleanup."""
    103         self._player.close()
    104         utils.system_output(self.RESET_BRIGHTNESS_CMD)
    105