// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#define MAX77650_CHARGER_ENABLED BIT(0)
#define MAX77650_CHARGER_DISABLED 0x00
#define MAX77650_CHARGER_CHG_EN_MASK BIT(0)
#define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4)
#define MAX77650_CHG_DETAILS_BITS(_reg) \
(((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
/* Charger is OFF. */
#define MAX77650_CHG_OFF 0x00
/* Charger is in prequalification mode. */
#define MAX77650_CHG_PREQ 0x01
/* Charger is in fast-charge constant current mode. */
#define MAX77650_CHG_ON_CURR 0x02
/* Charger is in JEITA modified fast-charge constant-current mode. */
#define MAX77650_CHG_ON_CURR_JEITA 0x03
/* Charger is in fast-charge constant-voltage mode. */
#define MAX77650_CHG_ON_VOLT 0x04
/* Charger is in JEITA modified fast-charge constant-voltage mode. */
#define MAX77650_CHG_ON_VOLT_JEITA 0x05
/* Charger is in top-off mode. */
#define MAX77650_CHG_ON_TOPOFF 0x06
/* Charger is in JEITA modified top-off mode. */
#define MAX77650_CHG_ON_TOPOFF_JEITA 0x07
/* Charger is done. */
#define MAX77650_CHG_DONE 0x08
/* Charger is JEITA modified done. */
#define MAX77650_CHG_DONE_JEITA 0x09
/* Charger is suspended due to a prequalification timer fault. */
#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a
/* Charger is suspended due to a fast-charge timer fault. */
#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b
/* Charger is suspended due to a battery temperature fault. */
#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c
#define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2)
#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
(((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00
#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01
#define MAX77650_CHGIN_OKAY 0x11
#define MAX77650_CHARGER_CHG_MASK BIT(1)
#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
(((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
#define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0
#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5)
#define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c
#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2)
struct max77650_charger_data {
struct regmap *map;
struct device *dev;
};
static enum power_supply_property max77650_charger_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CHARGE_TYPE
};
static const unsigned int max77650_charger_vchgin_min_table[] = {
4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
};
static const unsigned int max77650_charger_ichgin_lim_table[] = {
95000, 190000, 285000, 380000, 475000
};
static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
unsigned int val)
{
int i, rv;
for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
if (val == max77650_charger_vchgin_min_table[i]) {
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_VCHGIN_MIN_MASK,
MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
if (rv)
return rv;
return 0;
}
}
return -EINVAL;
}
static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
unsigned int val)
{
int i, rv;
for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
if (val == max77650_charger_ichgin_lim_table[i]) {
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_ICHGIN_LIM_MASK,
MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
if (rv)
return rv;
return 0;
}
}
return -EINVAL;
}
static int max77650_charger_enable(struct max77650_charger_data *chg)
{
int rv;
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_CHG_EN_MASK,
MAX77650_CHARGER_ENABLED);
if (rv)
dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
return rv;
}
static void max77650_charger_disable(struct max77650_charger_data *chg)
{
int rv;
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_CHG_EN_MASK,
MAX77650_CHARGER_DISABLED);
if (rv)
dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
}
static irqreturn_t max77650_charger_check_status(int irq, void *data)
{
struct max77650_charger_data *chg = data;
int rv, reg;
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv) {
dev_err(chg->dev,
"unable to read the charger status: %d\n", rv);
return IRQ_HANDLED;
}
switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
max77650_charger_disable(chg);
break;
case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
max77650_charger_disable(chg);
break;
case MAX77650_CHGIN_OKAY:
max77650_charger_enable(chg);
break;
default:
/* May be 0x10 - debouncing */
break;
}
return IRQ_HANDLED;
}
static int max77650_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max77650_charger_data *chg = power_supply_get_drvdata(psy);
int rv, reg;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
}
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
case MAX77650_CHG_OFF:
case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case MAX77650_CHG_PREQ:
case MAX77650_CHG_ON_CURR:
case MAX77650_CHG_ON_CURR_JEITA:
case MAX77650_CHG_ON_VOLT:
case MAX77650_CHG_ON_VOLT_JEITA:
case MAX77650_CHG_ON_TOPOFF:
case MAX77650_CHG_ON_TOPOFF_JEITA:
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
case MAX77650_CHG_DONE:
val->intval = POWER_SUPPLY_STATUS_FULL;
break;
default:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
}
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
case MAX77650_CHG_PREQ:
case MAX77650_CHG_ON_CURR:
case MAX77650_CHG_ON_CURR_JEITA:
case MAX77650_CHG_ON_VOLT:
case MAX77650_CHG_ON_VOLT_JEITA:
val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case MAX77650_CHG_ON_TOPOFF:
case MAX77650_CHG_ON_TOPOFF_JEITA:
val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
default:
val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
}
break;
default:
return -EINVAL;
}
return 0;
}
static const struct power_supply_desc max77650_battery_desc = {
.name = "max77650",
.type = POWER_SUPPLY_TYPE_USB,
.get_property = max77650_charger_get_property,
.properties = max77650_charger_properties,
.num_properties = ARRAY_SIZE(max77650_charger_properties),
};
static int max77650_charger_probe(struct platform_device *pdev)
{
struct power_supply_config pscfg = {};
struct max77650_charger_data *chg;
struct power_supply *battery;
struct device *dev, *parent;
int rv, chg_irq, chgin_irq;
unsigned int prop;
dev = &pdev->dev;
parent = dev->parent;
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
if (!chg)
return -ENOMEM;
platform_set_drvdata(pdev, chg);
chg->map = dev_get_regmap(parent, NULL);
if (!chg->map)
return -ENODEV;
chg->dev = dev;
pscfg.of_node = dev->of_node;
pscfg.drv_data = chg;
chg_irq = platform_get_irq_byname(pdev, "CHG");
if (chg_irq < 0)
return chg_irq;
chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
if (chgin_irq < 0)
return chgin_irq;
rv = devm_request_any_context_irq(dev, chg_irq,
max77650_charger_check_status,
IRQF_ONESHOT, "chg", chg);
if (rv < 0)
return rv;
rv = devm_request_any_context_irq(dev, chgin_irq,
max77650_charger_check_status,
IRQF_ONESHOT, "chgin", chg);
if (rv < 0)
return rv;
battery = devm_power_supply_register(dev,
&max77650_battery_desc, &pscfg);
if (IS_ERR(battery))
return PTR_ERR(battery);
rv = of_property_read_u32(dev->of_node,
"input-voltage-min-microvolt", &prop);
if (rv == 0) {
rv = max77650_charger_set_vchgin_min(chg, prop);
if (rv)
return rv;
}
rv = of_property_read_u32(dev->of_node,
"input-current-limit-microamp", &prop);
if (rv == 0) {
rv = max77650_charger_set_ichgin_lim(chg, prop);
if (rv)
return rv;
}
return max77650_charger_enable(chg);
}
static int max77650_charger_remove(struct platform_device *pdev)
{
struct max77650_charger_data *chg = platform_get_drvdata(pdev);
max77650_charger_disable(chg);
return 0;
}
static const struct of_device_id max77650_charger_of_match[] = {
{ .compatible = "maxim,max77650-charger" },
{ }
};
MODULE_DEVICE_TABLE(of, max77650_charger_of_match);
static struct platform_driver max77650_charger_driver = {
.driver = {
.name = "max77650-charger",
.of_match_table = max77650_charger_of_match,
},
.probe = max77650_charger_probe,
.remove = max77650_charger_remove,
};
module_platform_driver(max77650_charger_driver);
MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:max77650-charger");
