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