1# Copyright 2016 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
20TURN_OFF_DELAY = 1  # seconds. Needed for back to back runs
21
22
23def main():
24    """Put screen to sleep."""
25    screen_id = ''
26    for s in sys.argv[1:]:
27        if s[:7] == 'screen=' and len(s) > 7:
28            screen_id = s[7:]
29
30    if not screen_id:
31        print 'Error: need to specify screen serial'
32        assert False
33
34    cmd = ('adb -s %s shell dumpsys power | egrep "Display Power"'
35           % screen_id)
36    process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
37    cmd_ret = process.stdout.read()
38    screen_state = re.split(r'[s|=]', cmd_ret)[-1]
39    if 'OFF' in screen_state:
40        print 'Screen already OFF.'
41    else:
42        pwrdn = ('adb -s %s shell input keyevent POWER' % screen_id)
43        subprocess.Popen(pwrdn.split())
44        time.sleep(TURN_OFF_DELAY)
45
46if __name__ == '__main__':
47    main()
48