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6156c1b904
Change vendor specific charging current table to meet battery specification. Signed-off-by: Rong Chang <rongchang@chromium.org> BUG=chrome-os-partner:12012 TEST=run firmware_ECCharging Change-Id: I41a8060834bd02153d8c722ae5ffed7749226b83 Reviewed-on: https://gerrit.chromium.org/gerrit/29258 Reviewed-by: Vic Yang <victoryang@chromium.org> Tested-by: Rong Chang <rongchang@chromium.org> Commit-Ready: Rong Chang <rongchang@chromium.org>
148 lines
3.5 KiB
C
148 lines
3.5 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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/* 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 C 8200
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#define C_001 (int)(C * 0.01)
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/*
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* Common charging currents:
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* #define C_01 (int)(C * 0.1) == 820mA
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* #define C_02 (int)(C * 0.2) == 1640mA
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* #define C_05 (int)(C * 0.5) == 4100mA
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* #define C_07 (int)(C * 0.7) == 5740mA
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*/
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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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/* 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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/* Designed 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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/* Operation temperation 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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* The temperature values below should be deci-Kelvin
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*/
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.temp_charge_min = 0 * 10 + 2731,
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.temp_charge_max = 50 * 10 + 2731,
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.temp_discharge_min = -20 * 10 + 2731,
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.temp_discharge_max = 60 * 10 + 2731,
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/* Pre-charge voltage and current
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* I <= 0.01C
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*/
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.precharge_current = C_001,
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};
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/* Convert Celsius degree to Deci Kelvin degree */
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static inline int celsius_to_deci_kelvin(int degree_c)
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{
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return degree_c * 10 + 2731;
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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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/* Vendor provided parameters for battery charging */
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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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/* Hard limits
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* - charging voltage < 8.4V
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* - charging temperature range 0 ~ 45 degree Celcius
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* */
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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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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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/* Trickle charging and pre-charging current should be 0.01 C */
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if (*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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