1 # Copyright 2018 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 15 import os 16 import subprocess 17 import sys 18 19 CHARGE_PERCENT_START = 40 20 CHARGE_PERCENT_STOP = 60 21 22 23 def set_device_charging_limits(device_id): 24 """Set the start/stop percentages for charging. 25 26 This can keep battery from overcharging. 27 Args: 28 device_id: str; device ID to set limits 29 """ 30 print 'Rooting device %s' % device_id 31 cmd = ('adb -s %s root' % device_id) 32 process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, 33 stderr=subprocess.PIPE) 34 pout, perr = process.communicate() 35 if 'cannot' in pout.lower() or perr: # 'cannot root' returns no error 36 print ' Warning: unable to root %s and set charging limits.' % device_id 37 else: 38 print ' Setting charging limits on %s' % device_id 39 cmd = ('adb -s %s shell setprop persist.vendor.charge.start.level %d' % ( 40 device_id, CHARGE_PERCENT_START)) 41 process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, 42 stderr=subprocess.PIPE) 43 _, perr = process.communicate() 44 if not perr: 45 print ' Min: %d%%' % CHARGE_PERCENT_START 46 else: 47 print ' Warning: unable to set charging start limit.' 48 49 cmd = ('adb -s %s shell setprop persist.vendor.charge.stop.level %d' % ( 50 device_id, CHARGE_PERCENT_STOP)) 51 process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, 52 stderr=subprocess.PIPE) 53 _, perr = process.communicate() 54 if not perr: 55 print ' Max: %d%%' % CHARGE_PERCENT_STOP 56 else: 57 print ' Warning: unable to set charging stop limit.' 58 59 print 'Unrooting device %s' % device_id 60 cmd = ('adb -s %s unroot' % device_id) 61 subprocess.call(cmd.split(), stdout=subprocess.PIPE) 62 63 64 def main(): 65 """Set charging limits for battery.""" 66 67 device_id = None 68 for s in sys.argv[1:]: 69 if s[:7] == 'device=' and len(s) > 7: 70 device_id = s[7:] 71 72 if device_id: 73 set_device_charging_limits(device_id) 74 else: 75 print 'Usage: python %s device=$DEVICE_ID' % os.path.basename(__file__) 76 77 if __name__ == '__main__': 78 main() 79
