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https://github.com/Telecominfraproject/OpenCellular.git
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61ebbbbbd7
Previously, the battery charging algorithm would give the battery current even when it was requesting 0 mA. BUG=chrome-os-partner:15573 BRANCH=link TEST=charge battery and leave AC plugged in Battery will eventually drop to 99% charged. At that point, it should request 0mA, not 84mA or 85mA. (When it drops farther, it will really start requesting charge.) Change-Id: I464a7c8e857c928dbb9f9595f9c947d565b5f5c6 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/36526 Reviewed-by: Rong Chang <rongchang@chromium.org>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
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 pack vendor provided charging profile
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*/
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#include "battery_pack.h"
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/*
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* Design capacity
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* Battery capacity = 8200 mAh
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* 1C = 8200 mA
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*/
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#define DESIGN_CAPACITY 8200
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#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731)
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enum {
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TEMP_RANGE_10,
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TEMP_RANGE_23,
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TEMP_RANGE_35,
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TEMP_RANGE_45,
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TEMP_RANGE_50,
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TEMP_RANGE_MAX
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};
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enum {
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VOLT_RANGE_7200,
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VOLT_RANGE_8000,
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VOLT_RANGE_8400,
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VOLT_RANGE_MAX
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};
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/*
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* Vendor provided charging method
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* temp : < 7.2V, 7.2V ~ 8.0V, 8.0V ~ 8.4V
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* - 0 ~ 10 : 0.8A 1.6A 0.8A
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* - 10 ~ 23 : 1.6A 4.0A 1.6A
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* - 23 ~ 35 : 4.0A 4.0A 4.0A
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* - 35 ~ 45 : 1.6A 4.0A 1.6A
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* - 45 ~ 50 : 0.8A 1.6A 0.8A
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*/
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static const int const current_limit[TEMP_RANGE_MAX][VOLT_RANGE_MAX] = {
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{ 800, 1600, 800},
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{1600, 4000, 1600},
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{4000, 4000, 4000},
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{1600, 4000, 1600},
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{ 800, 1600, 800},
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};
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static const struct battery_info info = {
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/*
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* Design voltage
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* max = 8.4V
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* normal = 7.4V
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* min = 6.0V
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*/
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.voltage_max = 8400,
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.voltage_normal = 7400,
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.voltage_min = 6000,
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/*
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* Operational temperature range
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* 0 <= T_charge <= 50 deg C
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* -20 <= T_discharge <= 60 deg C
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*/
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.temp_charge_min = CELSIUS_TO_DECI_KELVIN(0),
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.temp_charge_max = CELSIUS_TO_DECI_KELVIN(50),
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.temp_discharge_min = CELSIUS_TO_DECI_KELVIN(-20),
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.temp_discharge_max = CELSIUS_TO_DECI_KELVIN(60),
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/* Pre-charge current: I <= 0.01C */
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.precharge_current = (int)(DESIGN_CAPACITY * 0.01),
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};
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static inline void limit_value(int *val, int limit)
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{
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if (*val > limit)
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*val = limit;
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}
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const struct battery_info *battery_get_info(void)
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{
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return &info;
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}
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void battery_vendor_params(struct batt_params *batt)
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{
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int *desired_current = &batt->desired_current;
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int temp_range, volt_range;
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/* Limit charging voltage */
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if (batt->desired_voltage > info.voltage_max)
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batt->desired_voltage = info.voltage_max;
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/* Don't charge if outside of allowable temperature range */
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if (batt->temperature >= info.temp_charge_max ||
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batt->temperature <= info.temp_charge_min) {
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batt->desired_voltage = 0;
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batt->desired_current = 0;
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return;
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}
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if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(10))
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temp_range = TEMP_RANGE_10;
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else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(23))
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temp_range = TEMP_RANGE_23;
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else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(35))
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temp_range = TEMP_RANGE_35;
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else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(45))
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temp_range = TEMP_RANGE_45;
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else
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temp_range = TEMP_RANGE_50;
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if (batt->voltage < 7200)
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volt_range = VOLT_RANGE_7200;
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else if (batt->voltage < 8000)
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volt_range = VOLT_RANGE_8000;
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else
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volt_range = VOLT_RANGE_8400;
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limit_value(desired_current, current_limit[temp_range][volt_range]);
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#ifndef CONFIG_SLOW_PRECHARGE
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/* If battery wants current, give it at least the precharge current */
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if (*desired_current > 0 && *desired_current < info.precharge_current)
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*desired_current = info.precharge_current;
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#endif /* CONFIG_SLOW_PRECHARGE */
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}
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