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3c06f602b6
Tell the host the battery is no longer charging when it hits 97%, and set the power adapter LED to green. This solves several problems: 1) The last 3% of charge takes a looong time. Kernel/ACPI/UI already have a hack to show the battery as charged when it's about 3% from full, but the EC still showed a yellow LED. 2) If the system is charged and you briefly unplug the adapter, the LED turned yellow for a long time as it slowly trickle-charged. Now it goes right to green. 3) A fully-charged battery will drop below 100% charge as it settles, but won't accept more current at that time. This caused the LED to turn yellow and stay there until the battery finally settled down to ~96%, at which point it'd accept more current and top itself off. The whole time it did this, the kernel/ACPI/UI hack from (1) would keep reporting "battery full". Now the LED stays green too. BUG=chrome-os-partner:11248 BRANCH=link TEST=manual - Discharge system to <95% full. - Plug adapter in. LED should come on yellow. - At around 97% full, the LED should turn green. - Around that the UI will display "battery full". (Note that due to rounding, the UI may take a few minutes to display "battery full" after the LED goes green; that's ok) - Unplug and replug adapter. LED should come on green. UI still reports "battery full". Change-Id: Ie56fbf3a05239e73d2c765bb98d36aa5cfedc2ef Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/34452
32 lines
981 B
C
32 lines
981 B
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Battery charging parameters and constraints
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*/
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#ifndef __CROS_EC_BATTERY_H
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#define __CROS_EC_BATTERY_H
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/* Design capacities, percentage */
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#define BATTERY_LEVEL_WARNING 15
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#define BATTERY_LEVEL_LOW 10
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#define BATTERY_LEVEL_CRITICAL 5
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#define BATTERY_LEVEL_SHUTDOWN 3
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/* Stop charge when state of charge reaches this percentage */
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#define STOP_CHARGE_THRESHOLD 100
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/* Tell host we're charged at this percentage */
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#define NEAR_FULL_THRESHOLD 97
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/* Precharge only when state of charge is below this level */
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#define PRE_CHARGE_THRESHOLD 25
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/* Define the lightbar color thresholds, percentage */
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#define LIGHTBAR_POWER_THRESHOLD_FULL 99
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#define LIGHTBAR_POWER_THRESHOLD_HIGH 40
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#define LIGHTBAR_POWER_THRESHOLD_MEDIUM 25
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/* LOW is anything below MEDIUM */
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#endif /* __CROS_EC_BATTERY_H */
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