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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Battery pack vendor provided charging profile
*/
#include "battery_pack.h"
/* Design capacity
* Battery capacity = 8200 mAh
* 1C = 8200 mA
*/
#define C 8200
#define C_001 (int)(C * 0.01)
/*
* Common charging currents:
* #define C_01 (int)(C * 0.1) == 820mA
* #define C_02 (int)(C * 0.2) == 1640mA
* #define C_05 (int)(C * 0.5) == 4100mA
* #define C_07 (int)(C * 0.7) == 5740mA
*/
enum {
TEMP_RANGE_10,
TEMP_RANGE_23,
TEMP_RANGE_35,
TEMP_RANGE_45,
TEMP_RANGE_50,
TEMP_RANGE_MAX
};
enum {
VOLT_RANGE_7200,
VOLT_RANGE_8000,
VOLT_RANGE_8400,
VOLT_RANGE_MAX
};
/* Vendor provided charging method
* temp : < 7.2V, 7.2V ~ 8.0V, 8.0V ~ 8.4V
* - 0 ~ 10 : 0.8A 1.6A 0.8A
* - 10 ~ 23 : 1.6A 4.0A 1.6A
* - 23 ~ 35 : 4.0A 4.0A 4.0A
* - 35 ~ 45 : 1.6A 4.0A 1.6A
* - 45 ~ 50 : 0.8A 1.6A 0.8A
*/
static const int const current_limit[TEMP_RANGE_MAX][VOLT_RANGE_MAX] = {
{ 800, 1600, 800},
{1600, 4000, 1600},
{4000, 4000, 4000},
{1600, 4000, 1600},
{ 800, 1600, 800},
};
static const struct battery_info info = {
/* Designed voltage
* max = 8.4V
* normal = 7.4V
* min = 6.0V
*/
.voltage_max = 8400,
.voltage_normal = 7400,
.voltage_min = 6000,
/* Operation temperation range
* 0 <= T_charge <= 50 deg C
* -20 <= T_discharge <= 60 deg C
*
* The temperature values below should be deci-Kelvin
*/
.temp_charge_min = 0 * 10 + 2731,
.temp_charge_max = 50 * 10 + 2731,
.temp_discharge_min = -20 * 10 + 2731,
.temp_discharge_max = 60 * 10 + 2731,
/* Pre-charge voltage and current
* I <= 0.01C
*/
.precharge_current = C_001,
};
/* Convert Celsius degree to Deci Kelvin degree */
static inline int celsius_to_deci_kelvin(int degree_c)
{
return degree_c * 10 + 2731;
}
static inline void limit_value(int *val, int limit)
{
if (*val > limit)
*val = limit;
}
const struct battery_info *battery_get_info(void)
{
return &info;
}
/* Vendor provided parameters for battery charging */
void battery_vendor_params(struct batt_params *batt)
{
int *desired_current = &batt->desired_current;
int temp_range, volt_range;
/* Hard limits
* - charging voltage < 8.4V
* - charging temperature range 0 ~ 45 degree Celcius
* */
if (batt->desired_voltage > info.voltage_max)
batt->desired_voltage = info.voltage_max;
if (batt->temperature >= info.temp_charge_max ||
batt->temperature <= info.temp_charge_min) {
batt->desired_voltage = 0;
batt->desired_current = 0;
return;
}
if (batt->temperature <= celsius_to_deci_kelvin(10))
temp_range = TEMP_RANGE_10;
else if (batt->temperature <= celsius_to_deci_kelvin(23))
temp_range = TEMP_RANGE_23;
else if (batt->temperature <= celsius_to_deci_kelvin(35))
temp_range = TEMP_RANGE_35;
else if (batt->temperature <= celsius_to_deci_kelvin(45))
temp_range = TEMP_RANGE_45;
else
temp_range = TEMP_RANGE_50;
if (batt->voltage < 7200)
volt_range = VOLT_RANGE_7200;
else if (batt->voltage < 8000)
volt_range = VOLT_RANGE_8000;
else
volt_range = VOLT_RANGE_8400;
limit_value(desired_current, current_limit[temp_range][volt_range]);
#ifndef CONFIG_SLOW_PRECHARGE
/* Trickle charging and pre-charging current should be 0.01 C */
if (*desired_current < info.precharge_current)
*desired_current = info.precharge_current;
#endif /* CONFIG_SLOW_PRECHARGE */
}
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