drivers/power/supply/max77650-charger.c - linux - Git at Google

 // 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 int 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);

 	return 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, &reg);
 	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, &reg);
 		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, &reg);
 		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, &reg);
 		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);

 	return max77650_charger_disable(chg);
 }

 static struct platform_driver max77650_charger_driver = {
 	.driver = {
 		.name = "max77650-charger",
 	},
 	.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");
	// 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 int 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);

	return 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, &reg);
	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, &reg);
	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, &reg);
	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, &reg);
	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);

	return max77650_charger_disable(chg);
	}

	static struct platform_driver max77650_charger_driver = {
	.driver = {
	.name = "max77650-charger",
	},
	.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");