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/* Copyright (c) 2013 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 bq24715 battery charger driver.
*/
#include "battery_smart.h"
#include "bq24715.h"
#include "charger.h"
#include "console.h"
#include "common.h"
#include "i2c.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)
/* Note: it is assumed that the sense resistors are 10mOhm. */
static const struct charger_info bq24725_charger_info = {
.name = "bq24715",
.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),
};
static inline int sbc_read(int cmd, int *param)
{
return i2c_read16__7bf(I2C_PORT_CHARGER, CHARGER_ADDR__7bf,
cmd, param);
}
static inline int sbc_write(int cmd, int param)
{
return i2c_write16__7bf(I2C_PORT_CHARGER, CHARGER_ADDR__7bf,
cmd, param);
}
int charger_set_input_current(int input_current)
{
return sbc_write(BQ24715_INPUT_CURRENT,
CURRENT_TO_REG(input_current, R_AC));
}
int charger_get_input_current(int *input_current)
{
int rv;
int reg;
rv = sbc_read(BQ24715_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(BQ24715_MANUFACTURER_ID, id);
}
int charger_device_id(int *id)
{
return sbc_read(BQ24715_DEVICE_ID, id);
}
int charger_get_option(int *option)
{
return sbc_read(BQ24715_CHARGE_OPTION, option);
}
int charger_set_option(int option)
{
return sbc_write(BQ24715_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 & OPT_CHARGE_INHIBIT_MASK) == OPT_CHARGE_DISABLE)
*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;
option &= ~OPT_CHARGE_INHIBIT_MASK;
if (mode & CHARGE_FLAG_INHIBIT_CHARGE)
option |= OPT_CHARGE_DISABLE;
else
option |= OPT_CHARGE_ENABLE;
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));
}
/* The voltage setting needs to be cached to work with the current
* charging infrastructure and state machine. The reason is that
* the state machine expects to be able to set a 0V charging voltage.
* The bq24715 does not allow this in the hardware register. Therefore
* 0V is handled specially to appease the state machine. */
static int cached_voltage;
int charger_get_voltage(int *voltage)
{
int ret;
if (cached_voltage == 0) {
*voltage = cached_voltage;
return EC_SUCCESS;
}
ret = sbc_read(SB_CHARGING_VOLTAGE, &cached_voltage);
if (ret == EC_SUCCESS)
*voltage = cached_voltage;
return ret;
}
int charger_set_voltage(int voltage)
{
cached_voltage = voltage;
return sbc_write(SB_CHARGING_VOLTAGE, voltage);
}
/* Charging power state initialization */
int charger_post_init(void)
{
int rv;
int option;
rv = charger_get_option(&option);
if (rv)
return rv;
/* Don't be noisy */
option |= OPT_AUDIO_FREQ_40KHZ_LIMIT;
/* Always monitor adapter current (40X multiplier). */
option |= OPT_FIX_IOUT_ALWAYS;
option &= ~OPT_IOUT_MASK;
option &= ~OPT_LEARN_MASK;
/* Enable dynamic power management */
option |= OPT_IDPM_ENABLE;
rv = charger_set_option(option);
if (rv)
return rv;
rv = charger_set_input_current(CONFIG_CHARGER_INPUT_CURRENT);
return rv;
}
int charger_discharge_on_ac(int enable)
{
int rv;
int option;
rv = charger_get_option(&option);
if (rv)
return rv;
option &= ~OPT_LEARN_MASK;
if (enable)
option |= OPT_LEARN_ENABLE;
else
option |= OPT_LEARN_DISABLE;
rv = charger_set_option(option);
return rv;
}
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