// SPDX-License-Identifier: GPL-2.0+
//
// Fuel gauge driver for Maxim 17042 / 8966 / 8997
// Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
//
// Copyright (C) 2011 Samsung Electronics
// MyungJoo Ham <myungjoo.ham@samsung.com>
//
// This driver is based on max17040_battery.c
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
#include <linux/of.h>
#include <linux/regmap.h>
/* Status register bits */
#define STATUS_POR_BIT (1 << 1)
#define STATUS_BST_BIT (1 << 3)
#define STATUS_VMN_BIT (1 << 8)
#define STATUS_TMN_BIT (1 << 9)
#define STATUS_SMN_BIT (1 << 10)
#define STATUS_BI_BIT (1 << 11)
#define STATUS_VMX_BIT (1 << 12)
#define STATUS_TMX_BIT (1 << 13)
#define STATUS_SMX_BIT (1 << 14)
#define STATUS_BR_BIT (1 << 15)
/* Interrupt mask bits */
#define CONFIG_ALRT_BIT_ENBL (1 << 2)
#define STATUS_INTR_SOCMIN_BIT (1 << 10)
#define STATUS_INTR_SOCMAX_BIT (1 << 14)
#define VFSOC0_LOCK 0x0000
#define VFSOC0_UNLOCK 0x0080
#define MODEL_UNLOCK1 0X0059
#define MODEL_UNLOCK2 0X00C4
#define MODEL_LOCK1 0X0000
#define MODEL_LOCK2 0X0000
#define dQ_ACC_DIV 0x4
#define dP_ACC_100 0x1900
#define dP_ACC_200 0x3200
#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
struct max17042_chip {
struct i2c_client *client;
struct regmap *regmap;
struct power_supply *battery;
enum max170xx_chip_type chip_type;
struct max17042_platform_data *pdata;
struct work_struct work;
int init_complete;
};
static enum power_supply_property max17042_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_COUNTER,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
POWER_SUPPLY_PROP_TEMP_MIN,
POWER_SUPPLY_PROP_TEMP_MAX,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_SCOPE,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
};
static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
{
int ret;
u32 data;
struct regmap *map = chip->regmap;
ret = regmap_read(map, MAX17042_TEMP, &data);
if (ret < 0)
return ret;
*temp = sign_extend32(data, 15);
/* The value is converted into deci-centigrade scale */
/* Units of LSB = 1 / 256 degree Celsius */
*temp = *temp * 10 / 256;
return 0;
}
static int max17042_get_status(struct max17042_chip *chip, int *status)
{
int ret, charge_full, charge_now;
int avg_current;
u32 data;
ret = power_supply_am_i_supplied(chip->battery);
if (ret < 0) {
*status = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
if (ret == 0) {
*status = POWER_SUPPLY_STATUS_DISCHARGING;
return 0;
}
/*
* The MAX170xx has builtin end-of-charge detection and will update
* FullCAP to match RepCap when it detects end of charging.
*
* When this cycle the battery gets charged to a higher (calculated)
* capacity then the previous cycle then FullCAP will get updated
* contineously once end-of-charge detection kicks in, so allow the
* 2 to differ a bit.
*/
ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
if (ret < 0)
return ret;
ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
if (ret < 0)