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/* Copyright 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 "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)
/* ChargeCurrent Register - 0x14 (mA) */
#define CHARGE_I_OFF 0
#define CHARGE_I_MIN 128
#define CHARGE_I_MAX 8128
#define CHARGE_I_STEP 64
/* MaxChargeVoltage Register - 0x15 (mV) */
#define CHARGE_V_MIN 1024
#define CHARGE_V_MAX 19200
#define CHARGE_V_STEP 16
/* InputCurrent Register - 0x3f (mA) */
#define INPUT_I_MIN 128
#define INPUT_I_MAX 8128
#define INPUT_I_STEP 64
/* Charger parameters */
static const struct charger_info bq2477x_charger_info = {
.name = CHARGER_NAME,
.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),
};
#ifdef CONFIG_CHARGER_BQ24773
static inline enum ec_error_list raw_read8(int chgnum, int offset, int *value)
{
return i2c_read8(chg_chips[chgnum].i2c_port,
chg_chips[chgnum].i2c_addr_flags, offset, value);
}
static inline enum ec_error_list raw_write8(int chgnum, int offset, int value)
{
return i2c_write8(chg_chips[chgnum].i2c_port,
chg_chips[chgnum].i2c_addr_flags, offset, value);
}
#endif
static inline enum ec_error_list raw_read16(int chgnum, int offset, int *value)
{
return i2c_read16(chg_chips[chgnum].i2c_port,
chg_chips[chgnum].i2c_addr_flags, offset, value);
}
static inline enum ec_error_list raw_write16(int chgnum, int offset, int value)
{
return i2c_write16(chg_chips[chgnum].i2c_port,
chg_chips[chgnum].i2c_addr_flags, offset, value);
}
/* chip specific interfaces */
static enum ec_error_list bq2477x_set_input_current_limit(int chgnum,
int input_current)
{
#ifdef CONFIG_CHARGER_BQ24770
return raw_write16(chgnum, REG_INPUT_CURRENT,
CURRENT_TO_REG(input_current, R_AC));
#elif defined(CONFIG_CHARGER_BQ24773)
return raw_write8(chgnum, REG_INPUT_CURRENT,
CURRENT_TO_REG8(input_current, R_AC));
#endif
}
static enum ec_error_list bq2477x_get_input_current_limit(int chgnum,
int *input_current)
{
int rv;
int reg;
#ifdef CONFIG_CHARGER_BQ24770
rv = raw_read16(chgnum, REG_INPUT_CURRENT, ®);
#elif defined(CONFIG_CHARGER_BQ24773)
rv = raw_read8(chgnum, REG_INPUT_CURRENT, ®);
#endif
if (rv)
return rv;
#ifdef CONFIG_CHARGER_BQ24770
*input_current = REG_TO_CURRENT(reg, R_AC);
#elif defined(CONFIG_CHARGER_BQ24773)
*input_current = REG8_TO_CURRENT(reg, R_AC);
#endif
return EC_SUCCESS;
}
static enum ec_error_list bq2477x_manufacturer_id(int chgnum, int *id)
{
#ifdef CONFIG_CHARGER_BQ24770
return raw_read16(chgnum, REG_MANUFACTURE_ID, id);
#elif defined(CONFIG_CHARGER_BQ24773)
*id = 0x40; /* TI */
return EC_SUCCESS;
#endif
}
static enum ec_error_list bq2477x_device_id(int chgnum, int *id)
{
#ifdef CONFIG_CHARGER_BQ24770
return raw_read16(chgnum, REG_DEVICE_ADDRESS, id);
#elif defined(CONFIG_CHARGER_BQ24773)
return raw_read8(chgnum, REG_DEVICE_ADDRESS, id);
#endif
}
static enum ec_error_list bq2477x_get_option(int chgnum, int *option)
{
return raw_read16(chgnum, REG_CHARGE_OPTION0, option);
}
static enum ec_error_list bq2477x_set_option(int chgnum, int option)
{
return raw_write16(chgnum, REG_CHARGE_OPTION0, option);
}
/* Charger interfaces */
static const struct charger_info *bq2477x_get_info(int chgnum)
{
return &bq2477x_charger_info;
}
static enum ec_error_list bq2477x_get_status(int chgnum, int *status)
{
int rv;
int option;
rv = bq2477x_get_option(chgnum, &option);
if (rv)
return rv;
/* Default status */
*status = CHARGER_LEVEL_2;
if (option & OPTION0_CHARGE_INHIBIT)
*status |= CHARGER_CHARGE_INHIBITED;
return EC_SUCCESS;
}
static enum ec_error_list bq2477x_set_mode(int chgnum, int mode)
{
int rv;
int option;
rv = bq2477x_get_option(chgnum, &option);
if (rv)
return rv;
if (mode & CHARGE_FLAG_INHIBIT_CHARGE)
option |= OPTION0_CHARGE_INHIBIT;
else
option &= ~OPTION0_CHARGE_INHIBIT;
return bq2477x_set_option(chgnum, option);
}
static enum ec_error_list bq2477x_get_current(int chgnum, int *current)
{
int rv;
int reg;
rv = raw_read16(chgnum, REG_CHARGE_CURRENT, ®);
if (rv)
return rv;
*current = REG_TO_CURRENT(reg, R_SNS);
return EC_SUCCESS;
}
static enum ec_error_list bq2477x_set_current(int chgnum, int current)
{
current = charger_closest_current(current);
return raw_write16(chgnum, REG_CHARGE_CURRENT,
CURRENT_TO_REG(current, R_SNS));
}
static enum ec_error_list bq2477x_get_voltage(int chgnum, int *voltage)
{
return raw_read16(chgnum, REG_MAX_CHARGE_VOLTAGE, voltage);
}
static enum ec_error_list bq2477x_set_voltage(int chgnum, int voltage)
{
voltage = charger_closest_voltage(voltage);
return raw_write16(chgnum, REG_MAX_CHARGE_VOLTAGE, voltage);
}
/* Charging power state initialization */
static enum ec_error_list bq2477x_post_init(int chgnum)
{
int rv, option;
#ifdef CONFIG_CHARGER_ILIM_PIN_DISABLED
int option2;
#endif
rv = bq2477x_get_option(chgnum, &option);
if (rv)
return rv;
option &= ~OPTION0_LEARN_ENABLE;
rv = bq2477x_set_option(chgnum, option);
if (rv)
return rv;
/* Turn off PROCHOT warning */
rv = raw_read16(chgnum, REG_PROCHOT_OPTION1, &option);
if (rv)
return rv;
option &= ~PROCHOT_OPTION1_SELECTOR_MASK;
rv = raw_write16(chgnum, REG_PROCHOT_OPTION1, option);
if (rv)
return rv;
#ifdef CONFIG_CHARGER_ILIM_PIN_DISABLED
/* Read the external ILIM pin enabled flag. */
rv = raw_read16(chgnum, REG_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 = raw_write16(chgnum, REG_CHARGE_OPTION2, option2);
}
return rv;
#else
return EC_SUCCESS;
#endif
}
static enum ec_error_list bq2477x_discharge_on_ac(int chgnum, int enable)
{
int rv;
int option;
rv = bq2477x_get_option(chgnum, &option);
if (rv)
return rv;
if (enable)
rv = bq2477x_set_option(chgnum, option | OPTION0_LEARN_ENABLE);
else
rv = bq2477x_set_option(chgnum, option & ~OPTION0_LEARN_ENABLE);
return rv;
}
const struct charger_drv bq2477x_drv = {
.post_init = &bq2477x_post_init,
.get_info = &bq2477x_get_info,
.get_status = &bq2477x_get_status,
.set_mode = &bq2477x_set_mode,
.get_current = &bq2477x_get_current,
.set_current = &bq2477x_set_current,
.get_voltage = &bq2477x_get_voltage,
.set_voltage = &bq2477x_set_voltage,
.discharge_on_ac = &bq2477x_discharge_on_ac,
.set_input_current_limit = &bq2477x_set_input_current_limit,
.get_input_current_limit = &bq2477x_get_input_current_limit,
.manufacturer_id = &bq2477x_manufacturer_id,
.device_id = &bq2477x_device_id,
.get_option = &bq2477x_get_option,
.set_option = &bq2477x_set_option,
};
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