1# Copyright 2015 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import re
16import subprocess
17import sys
18import time
19
20DISPLAY_LEVEL = 96  # [0:255] Depends on tablet model. Adjust for best result.
21DISPLAY_CMD_WAIT = 0.5  # seconds. Screen commands take time to have effect
22DISPLAY_TIMEOUT = 1800000  # ms
23
24
25def main():
26    """Power up and unlock screen as needed."""
27    screen_id = None
28    display_level = DISPLAY_LEVEL
29    for s in sys.argv[1:]:
30        if s[:7] == 'screen=' and len(s) > 7:
31            screen_id = s[7:]
32        if s[:11] == 'brightness=' and len(s) > 11:
33            display_level = int(s[11:])
34            if display_level < 0 or display_level > 255:
35                print 'Invalid brightness value. Range is [0-255]'
36                display_level = DISPLAY_LEVEL
37
38    if not screen_id:
39        print 'Error: need to specify screen serial'
40        assert False
41
42    # turn on screen if necessary and unlock
43    cmd = ('adb -s %s shell dumpsys display | egrep "mScreenState"'
44           % screen_id)
45    process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
46    cmd_ret = process.stdout.read()
47    screen_state = re.split(r'[s|=]', cmd_ret)[-1]
48    power_event = ('adb -s %s shell input keyevent POWER' % screen_id)
49    subprocess.Popen(power_event.split())
50    time.sleep(DISPLAY_CMD_WAIT)
51    if 'ON' in screen_state:
52        print 'Screen was ON. Toggling to refresh.'
53        subprocess.Popen(power_event.split())
54        time.sleep(DISPLAY_CMD_WAIT)
55    else:
56        print 'Screen was OFF. Powered ON.'
57    unlock = ('adb -s %s wait-for-device shell wm dismiss-keyguard'
58              % screen_id)
59    subprocess.Popen(unlock.split())
60    time.sleep(DISPLAY_CMD_WAIT)
61
62    # set to manual mode and set brightness
63    manual = ('adb -s %s shell settings put system screen_brightness_mode 0'
64              % screen_id)
65    subprocess.Popen(manual.split())
66    time.sleep(DISPLAY_CMD_WAIT)
67    print 'Tablet display brightness set to %d' % display_level
68    bright = ('adb -s %s shell settings put system screen_brightness %d'
69              % (screen_id, display_level))
70    subprocess.Popen(bright.split())
71    time.sleep(DISPLAY_CMD_WAIT)
72
73    # set screen to dim at max time (30min)
74    stay_bright = ('adb -s %s shell settings put system screen_off_timeout %d'
75                   % (screen_id, DISPLAY_TIMEOUT))
76    subprocess.Popen(stay_bright.split())
77    time.sleep(DISPLAY_CMD_WAIT)
78
79if __name__ == '__main__':
80    main()
81