| # Copyright 2018 The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import os |
| import subprocess |
| import sys |
| |
| CHARGE_PERCENT_START = 40 |
| CHARGE_PERCENT_STOP = 60 |
| |
| |
| def set_device_charging_limits(device_id): |
| """Set the start/stop percentages for charging. |
| |
| This can keep battery from overcharging. |
| Args: |
| device_id: str; device ID to set limits |
| """ |
| print 'Rooting device %s' % device_id |
| cmd = ('adb -s %s root' % device_id) |
| process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, |
| stderr=subprocess.PIPE) |
| pout, perr = process.communicate() |
| if 'cannot' in pout.lower() or perr: # 'cannot root' returns no error |
| print ' Warning: unable to root %s and set charging limits.' % device_id |
| else: |
| print ' Setting charging limits on %s' % device_id |
| cmd = ('adb -s %s shell setprop persist.vendor.charge.start.level %d' % ( |
| device_id, CHARGE_PERCENT_START)) |
| process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, |
| stderr=subprocess.PIPE) |
| _, perr = process.communicate() |
| if not perr: |
| print ' Min: %d%%' % CHARGE_PERCENT_START |
| else: |
| print ' Warning: unable to set charging start limit.' |
| |
| cmd = ('adb -s %s shell setprop persist.vendor.charge.stop.level %d' % ( |
| device_id, CHARGE_PERCENT_STOP)) |
| process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, |
| stderr=subprocess.PIPE) |
| _, perr = process.communicate() |
| if not perr: |
| print ' Max: %d%%' % CHARGE_PERCENT_STOP |
| else: |
| print ' Warning: unable to set charging stop limit.' |
| |
| print 'Unrooting device %s' % device_id |
| cmd = ('adb -s %s unroot' % device_id) |
| subprocess.call(cmd.split(), stdout=subprocess.PIPE) |
| |
| |
| def main(): |
| """Set charging limits for battery.""" |
| |
| device_id = None |
| for s in sys.argv[1:]: |
| if s[:7] == 'device=' and len(s) > 7: |
| device_id = s[7:] |
| |
| if device_id: |
| set_device_charging_limits(device_id) |
| else: |
| print 'Usage: python %s device=$DEVICE_ID' % os.path.basename(__file__) |
| |
| if __name__ == '__main__': |
| main() |