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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.
*
* TI bq24725 battery charger driver.
*/
#include "battery_smart.h"
#include "bq24725.h"
#include "charger.h"
#include "console.h"
#include "common.h"
#include "util.h"
/* Sense resistor configurations and macros */
#define DEFAULT_SENSE_RESISTOR 10
#define R_SNS CONFIG_CHARGER_SENSE_RESISTOR
#define R_AC CONFIG_CHARGER_SENSE_RESISTOR_AC
#define REG_TO_CURRENT(REG, RS) ((REG) * DEFAULT_SENSE_RESISTOR / (RS))
#define CURRENT_TO_REG(CUR, RS) ((CUR) * (RS) / DEFAULT_SENSE_RESISTOR)
/* Charger information
* charge voltage bitmask: 0111 1111 1111 0000
* charge current bitmask: 0001 1111 1000 0000
* input current bitmask : 0000 0000 1000 0000
*/
static const struct charger_info bq24725_charger_info = {
.name = "bq24725",
.voltage_max = 19200,
.voltage_min = 1024,
.voltage_step = 16,
.current_max = REG_TO_CURRENT(8128, R_SNS),
.current_min = REG_TO_CURRENT(128, R_SNS),
.current_step = REG_TO_CURRENT(128, R_SNS),
.input_current_max = REG_TO_CURRENT(8064, R_AC),
.input_current_min = REG_TO_CURRENT(128, R_AC),
.input_current_step = REG_TO_CURRENT(128, R_AC),
};
/* bq24725 specific interfaces */
int charger_set_input_current(int input_current)
{
return sbc_write(BQ24725_INPUT_CURRENT,
CURRENT_TO_REG(input_current, R_AC));
}
int charger_get_input_current(int *input_current)
{
int rv;
int reg;
rv = sbc_read(BQ24725_INPUT_CURRENT, ®);
if (rv)
return rv;
*input_current = REG_TO_CURRENT(reg, R_AC);
return EC_SUCCESS;
}
int charger_manufacturer_id(int *id)
{
return sbc_read(BQ24725_MANUFACTURE_ID, id);
}
int charger_device_id(int *id)
{
return sbc_read(BQ24725_DEVICE_ID, id);
}
int charger_get_option(int *option)
{
return sbc_read(BQ24725_CHARGE_OPTION, option);
}
int charger_set_option(int option)
{
return sbc_write(BQ24725_CHARGE_OPTION, option);
}
/* Charger interfaces */
const struct charger_info *charger_get_info(void)
{
return &bq24725_charger_info;
}
int charger_get_status(int *status)
{
int rv;
int option;
rv = charger_get_option(&option);
if (rv)
return rv;
/* Default status */
*status = CHARGER_LEVEL_2;
if (option & OPTION_CHARGE_INHIBIT)
*status |= CHARGER_CHARGE_INHIBITED;
return EC_SUCCESS;
}
int charger_set_mode(int mode)
{
int rv;
int option;
rv = charger_get_option(&option);
if (rv)
return rv;
if (mode & CHARGE_FLAG_INHIBIT_CHARGE)
option |= OPTION_CHARGE_INHIBIT;
else
option &= ~OPTION_CHARGE_INHIBIT;
return charger_set_option(option);
}
int charger_get_current(int *current)
{
int rv;
int reg;
rv = sbc_read(SB_CHARGING_CURRENT, ®);
if (rv)
return rv;
*current = REG_TO_CURRENT(reg, R_SNS);
return EC_SUCCESS;
}
int charger_set_current(int current)
{
current = charger_closest_current(current);
return sbc_write(SB_CHARGING_CURRENT, CURRENT_TO_REG(current, R_SNS));
}
int charger_get_voltage(int *voltage)
{
return sbc_read(SB_CHARGING_VOLTAGE, voltage);
}
int charger_set_voltage(int voltage)
{
return sbc_write(SB_CHARGING_VOLTAGE, voltage);
}
/* Charging power state initialization */
int charger_post_init(void)
{
/*
* Note: bq24725 power on reset state is:
* watch dog timer = 175 sec
* input current limit = ~1/2 maximum setting
* charging voltage = 0 mV
* charging current = 0 mA
*/
int rv, option;
rv = charger_get_option(&option);
if (rv)
return rv;
option &= ~OPTION_LEARN_ENABLE;
rv = charger_set_option(option);
if (rv)
return rv;
/* Set charger input current limit */
return charger_set_input_current(CONFIG_CHARGER_INPUT_CURRENT);
}
int charger_discharge_on_ac(int enable)
{
int rv;
int option;
rv = charger_get_option(&option);
if (rv)
return rv;
if (enable)
rv = charger_set_option(option | OPTION_LEARN_ENABLE);
else
rv = charger_set_option(option & ~OPTION_LEARN_ENABLE);
return rv;
}
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