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/* Copyright (c) 2014 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 bq24773 battery charger driver.
*/
#include "battery_smart.h"
#include "bq24773.h"
#include "charger.h"
#include "console.h"
#include "common.h"
#include "i2c.h"
#include "util.h"
/*
* on the I2C version of the charger,
* some registers are 8-bit only (eg input current)
* and they are shifted by 6 bits compared to the SMBUS version (bq24770).
*/
#define REG8_SHIFT 6
#define R8 (1 << (REG8_SHIFT))
/* 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)
#define REG8_TO_CURRENT(REG, RS) ((REG) * DEFAULT_SENSE_RESISTOR / (RS) * R8)
#define CURRENT_TO_REG8(CUR, RS) ((CUR) * (RS) / DEFAULT_SENSE_RESISTOR / R8)
/* Charger parameters */
static const struct charger_info bq24773_charger_info = {
.name = "bq24773",
.voltage_max = CHARGE_V_MAX,
.voltage_min = CHARGE_V_MIN,
.voltage_step = CHARGE_V_STEP,
.current_max = REG_TO_CURRENT(CHARGE_I_MAX, R_SNS),
.current_min = REG_TO_CURRENT(CHARGE_I_MIN, R_SNS),
.current_step = REG_TO_CURRENT(CHARGE_I_STEP, R_SNS),
.input_current_max = REG_TO_CURRENT(INPUT_I_MAX, R_AC),
.input_current_min = REG_TO_CURRENT(INPUT_I_MIN, R_AC),
.input_current_step = REG_TO_CURRENT(INPUT_I_STEP, R_AC),
};
/* bq24773 specific interfaces */
int charger_set_input_current(int input_current)
{
return i2c_write8(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_INPUT_CURRENT,
CURRENT_TO_REG8(input_current, R_AC));
}
int charger_get_input_current(int *input_current)
{
int rv;
int reg;
rv = i2c_read8(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_INPUT_CURRENT, ®);
if (rv)
return rv;
*input_current = REG8_TO_CURRENT(reg, R_AC);
return EC_SUCCESS;
}
int charger_manufacturer_id(int *id)
{
*id = 0x40; /* TI */
return EC_SUCCESS;
}
int charger_device_id(int *id)
{
return i2c_read8(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_DEVICE_ADDRESS, id);
}
int charger_get_option(int *option)
{
return i2c_read16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_OPTION0, option);
}
int charger_set_option(int option)
{
return i2c_write16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_OPTION0, option);
}
/* Charger interfaces */
const struct charger_info *charger_get_info(void)
{
return &bq24773_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 & OPTION0_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 |= OPTION0_CHARGE_INHIBIT;
else
option &= ~OPTION0_CHARGE_INHIBIT;
return charger_set_option(option);
}
int charger_get_current(int *current)
{
int rv;
int reg;
rv = i2c_read16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_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 i2c_write16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_CURRENT, CURRENT_TO_REG(current, R_SNS));
}
int charger_get_voltage(int *voltage)
{
return i2c_read16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_MAX_CHARGE_VOLTAGE, voltage);
}
int charger_set_voltage(int voltage)
{
return i2c_write16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_MAX_CHARGE_VOLTAGE, voltage);
}
/* Charging power state initialization */
int charger_post_init(void)
{
#ifdef CONFIG_CHARGER_ILIM_PIN_DISABLED
int rv;
int option2;
#endif
#ifdef CONFIG_CHARGER_ILIM_PIN_DISABLED
/* Read the external ILIM pin enabled flag. */
rv = i2c_read16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_OPTION2, &option2);
if (rv)
return rv;
/* Set ILIM pin disabled if it is currently enabled. */
if (option2 & OPTION2_EN_EXTILIM) {
option2 &= ~OPTION2_EN_EXTILIM;
rv = i2c_write16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_OPTION2, option2);
}
return rv;
#else
return EC_SUCCESS;
#endif
}
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 | OPTION0_LEARN_ENABLE);
else
rv = charger_set_option(option & ~OPTION0_LEARN_ENABLE);
return rv;
}
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