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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 = 8500 mAh
* 1C = 8500 mA
*/
#define C 8500
#define C_001 (int)(C * 0.01)
#define C_01 (int)(C * 0.1)
#define C_02 (int)(C * 0.2)
#define C_05 (int)(C * 0.5)
#define C_07 (int)(C * 0.7)
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 <= 45 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 = 45 * 10 + 2731,
.temp_discharge_min = -20 * 10 + 2731,
.temp_discharge_max = 60 * 10 + 2731,
/* Maximum discharging current
* TODO(rong): Check if we need this in power manager
*
* 1.0C
* 25 <= T_maxdischarge <= 45
*
* .current_discharge_max = C,
* .temp_maxdisch_max = 45,
* .temp_maxdisch_min = 25
*
*/
/* 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;
/* 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;
}
/* Vendor provided charging method
* temp : I - V , I - V
* - 0 ~ 10 : 0.2C - 8.0V, 0.1C to 8.4V
* - 10 ~ 23 : 0.5C - 8.0V, 0.2C to 8.4V
* - 23 ~ 45 : 0.7C - 8.0V, 0.2C to 8.4V
*/
if (batt->temperature <= celsius_to_deci_kelvin(10)) {
if (batt->voltage < 8000)
limit_value(desired_current, C_02);
else
limit_value(desired_current, C_01);
} else if (batt->temperature <= celsius_to_deci_kelvin(23)) {
if (batt->voltage < 8000)
limit_value(desired_current, C_05);
else
limit_value(desired_current, C_02);
} else {
if (batt->voltage < 8000)
limit_value(desired_current, C_07);
else
limit_value(desired_current, C_02);
}
#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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