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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
* Copyright (c) 2023, Linaro Limited
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#define REG_BATID 0x00 /* This one is very unclear */
#define BATID_101 0x0101 /* 107kOhm */
#define BATID_102 0x0102 /* 10kOhm */
#define REG_TEMPERATURE 0x06
#define REG_VOLTAGE 0x08
#define REG_FLAGS 0x0a
#define MM8013_FLAG_OTC BIT(15)
#define MM8013_FLAG_OTD BIT(14)
#define MM8013_FLAG_BATHI BIT(13)
#define MM8013_FLAG_BATLOW BIT(12)
#define MM8013_FLAG_CHG_INH BIT(11)
#define MM8013_FLAG_FC BIT(9)
#define MM8013_FLAG_CHG BIT(8)
#define MM8013_FLAG_OCC BIT(6)
#define MM8013_FLAG_ODC BIT(5)
#define MM8013_FLAG_OT BIT(4)
#define MM8013_FLAG_UT BIT(3)
#define MM8013_FLAG_DSG BIT(0)
#define REG_FULL_CHARGE_CAPACITY 0x0e
#define REG_NOMINAL_CHARGE_CAPACITY 0x0c
#define REG_AVERAGE_CURRENT 0x14
#define REG_AVERAGE_TIME_TO_EMPTY 0x16
#define REG_AVERAGE_TIME_TO_FULL 0x18
#define REG_MAX_LOAD_CURRENT 0x1e
#define REG_CYCLE_COUNT 0x2a
#define REG_STATE_OF_CHARGE 0x2c
#define REG_DESIGN_CAPACITY 0x3c
/* TODO: 0x62-0x68 seem to contain 'MM8013C' in a length-prefixed, non-terminated string */
#define DECIKELVIN_TO_DECIDEGC(t) (t - 2731)
struct mm8013_chip {
struct i2c_client *client;
struct regmap *regmap;
};
static int mm8013_checkdevice(struct mm8013_chip *chip)
{
int battery_id, ret;
u32 val;
ret = regmap_write(chip->regmap, REG_BATID, 0x0008);
if (ret < 0)
return ret;
ret = regmap_read(chip->regmap, REG_BATID, &val);
if (ret < 0)
return ret;
if (val == BATID_102)
battery_id = 2;
else if (val == BATID_101)
battery_id = 1;
else
return -EINVAL;
dev_dbg(&chip->client->dev, "battery_id: %d\n", battery_id);
return 0;
}
static enum power_supply_property mm8013_battery_props[] = {
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
};
static int mm8013_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct mm8013_chip *chip = psy->drv_data;
int ret = 0;
u32 regval;
switch (psp) {
case POWER_SUPPLY_PROP_CAPACITY:
ret = regmap_read(chip->regmap, REG_STATE_OF_CHARGE, ®val);
if (ret < 0)
return ret;
val->intval = regval;
break;
case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
ret = regmap_read(chip->regmap, REG_FLAGS, ®val);
if (ret < 0)
return ret;
if (regval & MM8013_FLAG_CHG_INH)
val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
else
val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
ret = regmap_read(chip->regmap, REG_FULL_CHARGE_CAPACITY, ®val);
if (ret < 0)
return ret;
val->intval = 1000 * regval;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
ret = regmap_read(chip->regmap, REG_DESIGN_CAPACITY, ®val);
if (ret < 0)
return ret;
val->intval = 1000 * regval;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
ret = regmap_read(chip->regmap, REG_NOMINAL_CHARGE_CAPACITY, ®val);
if (ret < 0)
return ret;
val->intval = 1000 * regval;
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
ret = regmap_read(chip->regmap, REG_MAX_LOAD_CURRENT, ®val);
if (ret < 0)
return ret;
val->intval = -1000 * (s16)regval;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = regmap_read(chip->regmap, REG_AVERAGE_CURRENT, ®val);
if (ret < 0)
return ret;
val->intval = -1000 * (s16)regval;
break;
case POWER_SUPPLY_PROP_CYCLE_COUNT:
ret = regmap_read(chip->regmap, REG_CYCLE_COUNT, ®val);
if (ret < 0)
return ret;
val->intval = regval;
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = regmap_read(chip->regmap, REG_FLAGS, ®val);
if (ret < 0)
return ret;
if (regval & MM8013_FLAG_UT)
val->intval = POWER_SUPPLY_HEALTH_COLD;
else if (regval & (MM8013_FLAG_ODC | MM8013_FLAG_OCC))
val->intval = POWER_SUPPLY_HEALTH_OVERCURRENT;
else if (regval & (MM8013_FLAG_BATLOW))
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
else if (regval & MM8013_FLAG_BATHI)
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else if (regval & (MM8013_FLAG_OT | MM8013_FLAG_OTD | MM8013_FLAG_OTC))
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_PRESENT:
ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);
if (ret < 0)
return ret;
val->intval = ((s16)regval > 0);
break;
case POWER_SUPPLY_PROP_STATUS:
ret = regmap_read(chip->regmap, REG_FLAGS, ®val);
if (ret < 0)
return ret;
if (regval & MM8013_FLAG_DSG)
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
else if (regval & MM8013_FLAG_CHG)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (regval & MM8013_FLAG_FC)
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
break;
case POWER_SUPPLY_PROP_TEMP:
ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);
if (ret < 0)
return ret;
val->intval = DECIKELVIN_TO_DECIDEGC(regval);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_EMPTY, ®val);
if (ret < 0)
return ret;
/* The estimation is not yet ready */
if (regval == U16_MAX)
return -ENODATA;
val->intval = regval;
break;
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_FULL, ®val);
if (ret < 0)
return ret;
/* The estimation is not yet ready */
if (regval == U16_MAX)
return -ENODATA;
val->intval = regval;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = regmap_read(chip->regmap, REG_VOLTAGE, ®val);
if (ret < 0)
return ret;
val->intval = 1000 * regval;
break;
default:
return -EINVAL;
}
return 0;
}
static const struct power_supply_desc mm8013_desc = {
.name = "mm8013",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = mm8013_battery_props,
.num_properties = ARRAY_SIZE(mm8013_battery_props),
.get_property = mm8013_get_property,
};
static const struct regmap_config mm8013_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = 0x68,
.use_single_read = true,
.use_single_write = true,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int mm8013_probe(struct i2c_client *client)
{
struct power_supply_config psy_cfg = {};
struct device *dev = &client->dev;
struct power_supply *psy;
struct mm8013_chip *chip;
int ret = 0;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
return dev_err_probe(dev, -EIO,
"I2C_FUNC_SMBUS_WORD_DATA not supported\n");
chip = devm_kzalloc(dev, sizeof(struct mm8013_chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
chip->regmap = devm_regmap_init_i2c(client, &mm8013_regmap_config);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
return dev_err_probe(dev, ret, "Couldn't initialize regmap\n");
}
ret = mm8013_checkdevice(chip);
if (ret)
return dev_err_probe(dev, ret, "MM8013 not found\n");
psy_cfg.drv_data = chip;
psy_cfg.of_node = dev->of_node;
psy = devm_power_supply_register(dev, &mm8013_desc, &psy_cfg);
if (IS_ERR(psy))
return PTR_ERR(psy);
return 0;
}
static const struct i2c_device_id mm8013_id_table[] = {
{ "mm8013", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, mm8013_id_table);
static const struct of_device_id mm8013_match_table[] = {
{ .compatible = "mitsumi,mm8013" },
{}
};
static struct i2c_driver mm8013_i2c_driver = {
.probe = mm8013_probe,
.id_table = mm8013_id_table,
.driver = {
.name = "mm8013",
.of_match_table = mm8013_match_table,
},
};
module_i2c_driver(mm8013_i2c_driver);
MODULE_DESCRIPTION("MM8013 fuel gauge driver");
MODULE_LICENSE("GPL");
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