drivers/regulator/max8998.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // max8998.c - Voltage regulator driver for the Maxim 8998
 //
 //  Copyright (C) 2009-2010 Samsung Electronics
 //  Kyungmin Park <kyungmin.park@samsung.com>
 //  Marek Szyprowski <m.szyprowski@samsung.com>

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/err.h>
 #include <linux/bits.h>
 #include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/mfd/max8998.h>
 #include <linux/mfd/max8998-private.h>

 struct max8998_data {
 	struct device		*dev;
 	struct max8998_dev	*iodev;
 	int			num_regulators;
 	u8                      buck1_vol[4]; /* voltages for selection */
 	u8                      buck2_vol[2];
 	unsigned int		buck1_idx; /* index to last changed voltage */
 					   /* value in a set */
 	unsigned int		buck2_idx;
 	struct gpio_desc	*buck1_gpio1;
 	struct gpio_desc	*buck1_gpio2;
 	struct gpio_desc	*buck2_gpio;
 };

 static const unsigned int charger_current_table[] = {
 	90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
 };

 static int max8998_get_enable_register(struct regulator_dev *rdev,
 					int *reg, int *shift)
 {
 	int ldo = rdev_get_id(rdev);

 	switch (ldo) {
 	case MAX8998_LDO2 ... MAX8998_LDO5:
 		*reg = MAX8998_REG_ONOFF1;
 		*shift = 3 - (ldo - MAX8998_LDO2);
 		break;
 	case MAX8998_LDO6 ... MAX8998_LDO13:
 		*reg = MAX8998_REG_ONOFF2;
 		*shift = 7 - (ldo - MAX8998_LDO6);
 		break;
 	case MAX8998_LDO14 ... MAX8998_LDO17:
 		*reg = MAX8998_REG_ONOFF3;
 		*shift = 7 - (ldo - MAX8998_LDO14);
 		break;
 	case MAX8998_BUCK1 ... MAX8998_BUCK4:
 		*reg = MAX8998_REG_ONOFF1;
 		*shift = 7 - (ldo - MAX8998_BUCK1);
 		break;
 	case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
 		*reg = MAX8998_REG_ONOFF4;
 		*shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
 		break;
 	case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
 		*reg = MAX8998_REG_CHGR2;
 		*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
 		break;
 	case MAX8998_CHARGER:
 		*reg = MAX8998_REG_CHGR2;
 		*shift = 0;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int ret, reg, shift = 8;
 	u8 val;

 	ret = max8998_get_enable_register(rdev, &reg, &shift);
 	if (ret)
 		return ret;

 	ret = max8998_read_reg(i2c, reg, &val);
 	if (ret)
 		return ret;

 	return val & (1 << shift);
 }

 static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
 {
 	return (!max8998_ldo_is_enabled(rdev));
 }

 static int max8998_ldo_enable(struct regulator_dev *rdev)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int reg, shift = 8, ret;

 	ret = max8998_get_enable_register(rdev, &reg, &shift);
 	if (ret)
 		return ret;

 	return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 }

 static int max8998_ldo_disable(struct regulator_dev *rdev)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int reg, shift = 8, ret;

 	ret = max8998_get_enable_register(rdev, &reg, &shift);
 	if (ret)
 		return ret;

 	return max8998_update_reg(i2c, reg, 0, 1<<shift);
 }

 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 				int *_reg, int *_shift, int *_mask)
 {
 	int ldo = rdev_get_id(rdev);
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	int reg, shift = 0, mask = 0xff;

 	switch (ldo) {
 	case MAX8998_LDO2 ... MAX8998_LDO3:
 		reg = MAX8998_REG_LDO2_LDO3;
 		mask = 0xf;
 		if (ldo == MAX8998_LDO2)
 			shift = 4;
 		else
 			shift = 0;
 		break;
 	case MAX8998_LDO4 ... MAX8998_LDO7:
 		reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 		break;
 	case MAX8998_LDO8 ... MAX8998_LDO9:
 		reg = MAX8998_REG_LDO8_LDO9;
 		mask = 0xf;
 		if (ldo == MAX8998_LDO8)
 			shift = 4;
 		else
 			shift = 0;
 		break;
 	case MAX8998_LDO10 ... MAX8998_LDO11:
 		reg = MAX8998_REG_LDO10_LDO11;
 		if (ldo == MAX8998_LDO10) {
 			shift = 5;
 			mask = 0x7;
 		} else {
 			shift = 0;
 			mask = 0x1f;
 		}
 		break;
 	case MAX8998_LDO12 ... MAX8998_LDO17:
 		reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 		break;
 	case MAX8998_BUCK1:
 		reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 		break;
 	case MAX8998_BUCK2:
 		reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 		break;
 	case MAX8998_BUCK3:
 		reg = MAX8998_REG_BUCK3;
 		break;
 	case MAX8998_BUCK4:
 		reg = MAX8998_REG_BUCK4;
 		break;
 	default:
 		return -EINVAL;
 	}

 	*_reg = reg;
 	*_shift = shift;
 	*_mask = mask;

 	return 0;
 }

 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int reg, shift = 0, mask, ret;
 	u8 val;

 	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 	if (ret)
 		return ret;

 	ret = max8998_read_reg(i2c, reg, &val);
 	if (ret)
 		return ret;

 	val >>= shift;
 	val &= mask;

 	return val;
 }

 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
 				       unsigned selector)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int reg, shift = 0, mask, ret;

 	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 	if (ret)
 		return ret;

 	ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);

 	return ret;
 }

 static inline void buck1_gpio_set(struct gpio_desc *gpio1, struct gpio_desc *gpio2, int v)
 {
 	gpiod_set_value(gpio1, v & 0x1);
 	gpiod_set_value(gpio2, (v >> 1) & 0x1);
 }

 static inline void buck2_gpio_set(struct gpio_desc *gpio, int v)
 {
 	gpiod_set_value(gpio, v & 0x1);
 }

 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
 					unsigned selector)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct max8998_platform_data *pdata = max8998->iodev->pdata;
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int buck = rdev_get_id(rdev);
 	int reg, shift = 0, mask, ret, j;
 	static u8 buck1_last_val;

 	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 	if (ret)
 		return ret;

 	switch (buck) {
 	case MAX8998_BUCK1:
 		dev_dbg(max8998->dev,
 			"BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 			"buck1_vol3:%d, buck1_vol4:%d\n",
 			selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
 			max8998->buck1_vol[2], max8998->buck1_vol[3]);

 		if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {

 			/* check if requested voltage */
 			/* value is already defined */
 			for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 				if (max8998->buck1_vol[j] == selector) {
 					max8998->buck1_idx = j;
 					buck1_gpio_set(max8998->buck1_gpio1,
 						       max8998->buck1_gpio2, j);
 					goto buck1_exit;
 				}
 			}

 			if (pdata->buck_voltage_lock)
 				return -EINVAL;

 			/* no predefine regulator found */
 			max8998->buck1_idx = (buck1_last_val % 2) + 2;
 			dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 				max8998->buck1_idx);
 			max8998->buck1_vol[max8998->buck1_idx] = selector;
 			ret = max8998_get_voltage_register(rdev, &reg,
 							   &shift,
 							   &mask);
 			ret = max8998_write_reg(i2c, reg, selector);
 			buck1_gpio_set(max8998->buck1_gpio1,
 				       max8998->buck1_gpio2, max8998->buck1_idx);
 			buck1_last_val++;
 buck1_exit:
 			dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 				i2c->name, gpiod_get_value(max8998->buck1_gpio1),
 				gpiod_get_value(max8998->buck1_gpio2));
 			break;
 		} else {
 			ret = max8998_write_reg(i2c, reg, selector);
 		}
 		break;

 	case MAX8998_BUCK2:
 		dev_dbg(max8998->dev,
 			"BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
 			selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 		if (max8998->buck2_gpio) {
 			/* check if requested voltage */
 			/* value is already defined */
 			for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 				if (max8998->buck2_vol[j] == selector) {
 					max8998->buck2_idx = j;
 					buck2_gpio_set(max8998->buck2_gpio, j);
 					goto buck2_exit;
 				}
 			}

 			if (pdata->buck_voltage_lock)
 				return -EINVAL;

 			max8998_get_voltage_register(rdev,
 					&reg, &shift, &mask);
 			ret = max8998_write_reg(i2c, reg, selector);
 			max8998->buck2_vol[max8998->buck2_idx] = selector;
 			buck2_gpio_set(max8998->buck2_gpio, max8998->buck2_idx);
 buck2_exit:
 			dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 				gpiod_get_value(max8998->buck2_gpio));
 		} else {
 			ret = max8998_write_reg(i2c, reg, selector);
 		}
 		break;

 	case MAX8998_BUCK3:
 	case MAX8998_BUCK4:
 		ret = max8998_update_reg(i2c, reg, selector<<shift,
 					 mask<<shift);
 		break;
 	}

 	return ret;
 }

 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 					     unsigned int old_selector,
 					     unsigned int new_selector)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	int buck = rdev_get_id(rdev);
 	u8 val = 0;
 	int difference, ret;

 	if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
 		return -EINVAL;

 	/* Voltage stabilization */
 	ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 	if (ret)
 		return ret;

 	/* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 	/* MAX8998 has ENRAMP bit implemented, so test it*/
 	if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 		return 0;

 	difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
 	if (difference > 0)
 		return DIV_ROUND_UP(difference, (val & 0x0f) + 1);

 	return 0;
 }

 static int max8998_set_current_limit(struct regulator_dev *rdev,
 				     int min_uA, int max_uA)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	unsigned int n_currents = rdev->desc->n_current_limits;
 	int i, sel = -1;

 	if (n_currents == 0)
 		return -EINVAL;

 	if (rdev->desc->curr_table) {
 		const unsigned int *curr_table = rdev->desc->curr_table;
 		bool ascend = curr_table[n_currents - 1] > curr_table[0];

 		/* search for closest to maximum */
 		if (ascend) {
 			for (i = n_currents - 1; i >= 0; i--) {
 				if (min_uA <= curr_table[i] &&
 				    curr_table[i] <= max_uA) {
 					sel = i;
 					break;
 				}
 			}
 		} else {
 			for (i = 0; i < n_currents; i++) {
 				if (min_uA <= curr_table[i] &&
 				    curr_table[i] <= max_uA) {
 					sel = i;
 					break;
 				}
 			}
 		}
 	}

 	if (sel < 0)
 		return -EINVAL;

 	sel <<= ffs(rdev->desc->csel_mask) - 1;

 	return max8998_update_reg(i2c, rdev->desc->csel_reg,
 				  sel, rdev->desc->csel_mask);
 }

 static int max8998_get_current_limit(struct regulator_dev *rdev)
 {
 	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8998->iodev->i2c;
 	u8 val;
 	int ret;

 	ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
 	if (ret != 0)
 		return ret;

 	val &= rdev->desc->csel_mask;
 	val >>= ffs(rdev->desc->csel_mask) - 1;

 	if (rdev->desc->curr_table) {
 		if (val >= rdev->desc->n_current_limits)
 			return -EINVAL;

 		return rdev->desc->curr_table[val];
 	}

 	return -EINVAL;
 }

 static const struct regulator_ops max8998_ldo_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= max8998_ldo_is_enabled,
 	.enable			= max8998_ldo_enable,
 	.disable		= max8998_ldo_disable,
 	.get_voltage_sel	= max8998_get_voltage_sel,
 	.set_voltage_sel	= max8998_set_voltage_ldo_sel,
 };

 static const struct regulator_ops max8998_buck_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= max8998_ldo_is_enabled,
 	.enable			= max8998_ldo_enable,
 	.disable		= max8998_ldo_disable,
 	.get_voltage_sel	= max8998_get_voltage_sel,
 	.set_voltage_sel	= max8998_set_voltage_buck_sel,
 	.set_voltage_time_sel	= max8998_set_voltage_buck_time_sel,
 };

 static const struct regulator_ops max8998_charger_ops = {
 	.set_current_limit	= max8998_set_current_limit,
 	.get_current_limit	= max8998_get_current_limit,
 	.is_enabled		= max8998_ldo_is_enabled_inverted,
 	/* Swapped as register is inverted */
 	.enable			= max8998_ldo_disable,
 	.disable		= max8998_ldo_enable,
 };

 static const struct regulator_ops max8998_others_ops = {
 	.is_enabled		= max8998_ldo_is_enabled,
 	.enable			= max8998_ldo_enable,
 	.disable		= max8998_ldo_disable,
 };

 #define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
 	{ \
 		.name = #_name, \
 		.id = MAX8998_##_name, \
 		.ops = _ops, \
 		.min_uV = (_min), \
 		.uV_step = (_step), \
 		.n_voltages = ((_max) - (_min)) / (_step) + 1, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 	}

 #define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
 	{ \
 		.name = #_name, \
 		.id = MAX8998_##_name, \
 		.ops = _ops, \
 		.curr_table = _table, \
 		.n_current_limits = ARRAY_SIZE(_table), \
 		.csel_reg = _reg, \
 		.csel_mask = _mask, \
 		.type = REGULATOR_CURRENT, \
 		.owner = THIS_MODULE, \
 	}

 #define MAX8998_OTHERS_REG(_name, _id) \
 	{ \
 		.name = #_name, \
 		.id = _id, \
 		.ops = &max8998_others_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 	}

 static const struct regulator_desc regulators[] = {
 	MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
 	MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
 	MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
 	MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
 	MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
 	MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
 	MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
 	MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
 	MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
 	MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
 	MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
 	MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
 	MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
 	MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
 	MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
 	MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
 	MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
 	MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
 			    charger_current_table, MAX8998_REG_CHGR1, 0x7),
 };

 static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
 					struct max8998_platform_data *pdata)
 {
 	struct device_node *pmic_np = iodev->dev->of_node;
 	struct device_node *regulators_np, *reg_np;
 	struct max8998_regulator_data *rdata;
 	unsigned int i;
 	int ret;

 	regulators_np = of_get_child_by_name(pmic_np, "regulators");
 	if (!regulators_np) {
 		dev_err(iodev->dev, "could not find regulators sub-node\n");
 		return -EINVAL;
 	}

 	/* count the number of regulators to be supported in pmic */
 	pdata->num_regulators = of_get_child_count(regulators_np);

 	rdata = devm_kcalloc(iodev->dev,
 			     pdata->num_regulators, sizeof(*rdata),
 			     GFP_KERNEL);
 	if (!rdata) {
 		of_node_put(regulators_np);
 		return -ENOMEM;
 	}

 	pdata->regulators = rdata;
 	for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
 		reg_np = of_get_child_by_name(regulators_np,
 							regulators[i].name);
 		if (!reg_np)
 			continue;

 		rdata->id = regulators[i].id;
 		rdata->initdata = of_get_regulator_init_data(iodev->dev,
 							     reg_np,
 							     &regulators[i]);
 		rdata->reg_node = reg_np;
 		++rdata;
 	}
 	pdata->num_regulators = rdata - pdata->regulators;

 	of_node_put(reg_np);
 	of_node_put(regulators_np);

 	pdata->buck_voltage_lock = of_property_read_bool(pmic_np, "max8998,pmic-buck-voltage-lock");

 	ret = of_property_read_u32(pmic_np,
 					"max8998,pmic-buck1-default-dvs-idx",
 					&pdata->buck1_default_idx);
 	if (!ret && pdata->buck1_default_idx >= 4) {
 		pdata->buck1_default_idx = 0;
 		dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 	}

 	ret = of_property_read_u32(pmic_np,
 					"max8998,pmic-buck2-default-dvs-idx",
 					&pdata->buck2_default_idx);
 	if (!ret && pdata->buck2_default_idx >= 2) {
 		pdata->buck2_default_idx = 0;
 		dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 	}

 	ret = of_property_read_u32_array(pmic_np,
 					"max8998,pmic-buck1-dvs-voltage",
 					pdata->buck1_voltage,
 					ARRAY_SIZE(pdata->buck1_voltage));
 	if (ret) {
 		dev_err(iodev->dev, "buck1 voltages not specified\n");
 		return -EINVAL;
 	}

 	ret = of_property_read_u32_array(pmic_np,
 					"max8998,pmic-buck2-dvs-voltage",
 					pdata->buck2_voltage,
 					ARRAY_SIZE(pdata->buck2_voltage));
 	if (ret) {
 		dev_err(iodev->dev, "buck2 voltages not specified\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int max8998_pmic_probe(struct platform_device *pdev)
 {
 	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct max8998_platform_data *pdata = iodev->pdata;
 	struct regulator_config config = { };
 	struct regulator_dev *rdev;
 	struct max8998_data *max8998;
 	struct i2c_client *i2c;
 	enum gpiod_flags flags;
 	int i, ret;
 	unsigned int v;

 	if (!pdata) {
 		dev_err(pdev->dev.parent, "No platform init data supplied\n");
 		return -ENODEV;
 	}

 	if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
 		ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
 		if (ret)
 			return ret;
 	}

 	max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
 			       GFP_KERNEL);
 	if (!max8998)
 		return -ENOMEM;

 	max8998->dev = &pdev->dev;
 	max8998->iodev = iodev;
 	max8998->num_regulators = pdata->num_regulators;
 	platform_set_drvdata(pdev, max8998);
 	i2c = max8998->iodev->i2c;

 	max8998->buck1_idx = pdata->buck1_default_idx;
 	max8998->buck2_idx = pdata->buck2_default_idx;

 	/* Check if MAX8998 voltage selection GPIOs are defined */
 	flags = (max8998->buck1_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 	max8998->buck1_gpio1 = devm_gpiod_get_index_optional(iodev->dev,
 							     "max8998,pmic-buck1-dvs",
 							     0,
 							     flags);
 	if (IS_ERR(max8998->buck1_gpio1))
 		return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck1_gpio1),
 				     "could not get BUCK1 GPIO1\n");
 	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK1_SET1");

 	flags = (max8998->buck1_idx & BIT(1)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 	max8998->buck1_gpio2 = devm_gpiod_get_index_optional(iodev->dev,
 							     "max8998,pmic-buck1-dvs",
 							     1,
 							     flags);
 	if (IS_ERR(max8998->buck1_gpio2))
 		return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck1_gpio2),
 				     "could not get BUCK1 GPIO2\n");
 	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK1_SET2");

 	flags = (max8998->buck2_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 	max8998->buck2_gpio = devm_gpiod_get_index_optional(iodev->dev,
 							     "max8998,pmic-buck2-dvs",
 							     0,
 							     flags);
 	if (IS_ERR(max8998->buck2_gpio))
 		return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck2_gpio),
 				     "could not get BUCK2 GPIO\n");
 	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK2_SET3");

 	if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {
 		/* Set predefined values for BUCK1 registers */
 		for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
 			int index = MAX8998_BUCK1 - MAX8998_LDO2;

 			i = 0;
 			while (regulators[index].min_uV +
 			       regulators[index].uV_step * i
 			       < pdata->buck1_voltage[v])
 				i++;

 			max8998->buck1_vol[v] = i;
 			ret = max8998_write_reg(i2c,
 					MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
 			if (ret)
 				return ret;
 		}
 	}

 	if (max8998->buck2_gpio) {
 		/* Set predefined values for BUCK2 registers */
 		for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
 			int index = MAX8998_BUCK2 - MAX8998_LDO2;

 			i = 0;
 			while (regulators[index].min_uV +
 			       regulators[index].uV_step * i
 			       < pdata->buck2_voltage[v])
 				i++;

 			max8998->buck2_vol[v] = i;
 			ret = max8998_write_reg(i2c,
 					MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
 			if (ret)
 				return ret;
 		}
 	}

 	for (i = 0; i < pdata->num_regulators; i++) {
 		int index = pdata->regulators[i].id - MAX8998_LDO2;

 		config.dev = max8998->dev;
 		config.of_node = pdata->regulators[i].reg_node;
 		config.init_data = pdata->regulators[i].initdata;
 		config.driver_data = max8998;

 		rdev = devm_regulator_register(&pdev->dev, &regulators[index],
 					       &config);
 		if (IS_ERR(rdev)) {
 			ret = PTR_ERR(rdev);
 			dev_err(max8998->dev, "regulator %s init failed (%d)\n",
 						regulators[index].name, ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static const struct platform_device_id max8998_pmic_id[] = {
 	{ "max8998-pmic", TYPE_MAX8998 },
 	{ "lp3974-pmic", TYPE_LP3974 },
 	{ }
 };
 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);

 static struct platform_driver max8998_pmic_driver = {
 	.driver = {
 		.name = "max8998-pmic",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe = max8998_pmic_probe,
 	.id_table = max8998_pmic_id,
 };

 static int __init max8998_pmic_init(void)
 {
 	return platform_driver_register(&max8998_pmic_driver);
 }
 subsys_initcall(max8998_pmic_init);

 static void __exit max8998_pmic_cleanup(void)
 {
 	platform_driver_unregister(&max8998_pmic_driver);
 }
 module_exit(max8998_pmic_cleanup);

 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	//
	// max8998.c - Voltage regulator driver for the Maxim 8998
	//
	// Copyright (C) 2009-2010 Samsung Electronics
	// Kyungmin Park <kyungmin.park@samsung.com>
	// Marek Szyprowski <m.szyprowski@samsung.com>

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/err.h>
	#include <linux/bits.h>
	#include <linux/gpio/consumer.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/mfd/max8998.h>
	#include <linux/mfd/max8998-private.h>

	struct max8998_data {
	struct device *dev;
	struct max8998_dev *iodev;
	int num_regulators;
	u8 buck1_vol[4]; /* voltages for selection */
	u8 buck2_vol[2];
	unsigned int buck1_idx; /* index to last changed voltage */
	/* value in a set */
	unsigned int buck2_idx;
	struct gpio_desc *buck1_gpio1;
	struct gpio_desc *buck1_gpio2;
	struct gpio_desc *buck2_gpio;
	};

	static const unsigned int charger_current_table[] = {
	90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
	};

	static int max8998_get_enable_register(struct regulator_dev *rdev,
	int reg, int shift)
	{
	int ldo = rdev_get_id(rdev);

	switch (ldo) {
	case MAX8998_LDO2 ... MAX8998_LDO5:
	*reg = MAX8998_REG_ONOFF1;
	*shift = 3 - (ldo - MAX8998_LDO2);
	break;
	case MAX8998_LDO6 ... MAX8998_LDO13:
	*reg = MAX8998_REG_ONOFF2;
	*shift = 7 - (ldo - MAX8998_LDO6);
	break;
	case MAX8998_LDO14 ... MAX8998_LDO17:
	*reg = MAX8998_REG_ONOFF3;
	*shift = 7 - (ldo - MAX8998_LDO14);
	break;
	case MAX8998_BUCK1 ... MAX8998_BUCK4:
	*reg = MAX8998_REG_ONOFF1;
	*shift = 7 - (ldo - MAX8998_BUCK1);
	break;
	case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
	*reg = MAX8998_REG_ONOFF4;
	*shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
	break;
	case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
	*reg = MAX8998_REG_CHGR2;
	*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
	break;
	case MAX8998_CHARGER:
	*reg = MAX8998_REG_CHGR2;
	*shift = 0;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int ret, reg, shift = 8;
	u8 val;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
	return ret;

	ret = max8998_read_reg(i2c, reg, &val);
	if (ret)
	return ret;

	return val & (1 << shift);
	}

	static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
	{
	return (!max8998_ldo_is_enabled(rdev));
	}

	static int max8998_ldo_enable(struct regulator_dev *rdev)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 8, ret;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
	return ret;

	return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
	}

	static int max8998_ldo_disable(struct regulator_dev *rdev)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 8, ret;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
	return ret;

	return max8998_update_reg(i2c, reg, 0, 1<<shift);
	}

	static int max8998_get_voltage_register(struct regulator_dev *rdev,
	int _reg, int _shift, int *_mask)
	{
	int ldo = rdev_get_id(rdev);
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	int reg, shift = 0, mask = 0xff;

	switch (ldo) {
	case MAX8998_LDO2 ... MAX8998_LDO3:
	reg = MAX8998_REG_LDO2_LDO3;
	mask = 0xf;
	if (ldo == MAX8998_LDO2)
	shift = 4;
	else
	shift = 0;
	break;
	case MAX8998_LDO4 ... MAX8998_LDO7:
	reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
	break;
	case MAX8998_LDO8 ... MAX8998_LDO9:
	reg = MAX8998_REG_LDO8_LDO9;
	mask = 0xf;
	if (ldo == MAX8998_LDO8)
	shift = 4;
	else
	shift = 0;
	break;
	case MAX8998_LDO10 ... MAX8998_LDO11:
	reg = MAX8998_REG_LDO10_LDO11;
	if (ldo == MAX8998_LDO10) {
	shift = 5;
	mask = 0x7;
	} else {
	shift = 0;
	mask = 0x1f;
	}
	break;
	case MAX8998_LDO12 ... MAX8998_LDO17:
	reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
	break;
	case MAX8998_BUCK1:
	reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
	break;
	case MAX8998_BUCK2:
	reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
	break;
	case MAX8998_BUCK3:
	reg = MAX8998_REG_BUCK3;
	break;
	case MAX8998_BUCK4:
	reg = MAX8998_REG_BUCK4;
	break;
	default:
	return -EINVAL;
	}

	*_reg = reg;
	*_shift = shift;
	*_mask = mask;

	return 0;
	}

	static int max8998_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 0, mask, ret;
	u8 val;

	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	if (ret)
	return ret;

	ret = max8998_read_reg(i2c, reg, &val);
	if (ret)
	return ret;

	val >>= shift;
	val &= mask;

	return val;
	}

	static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
	unsigned selector)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 0, mask, ret;

	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	if (ret)
	return ret;

	ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);

	return ret;
	}

	static inline void buck1_gpio_set(struct gpio_desc gpio1, struct gpio_desc gpio2, int v)
	{
	gpiod_set_value(gpio1, v & 0x1);
	gpiod_set_value(gpio2, (v >> 1) & 0x1);
	}

	static inline void buck2_gpio_set(struct gpio_desc *gpio, int v)
	{
	gpiod_set_value(gpio, v & 0x1);
	}

	static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
	unsigned selector)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct max8998_platform_data *pdata = max8998->iodev->pdata;
	struct i2c_client *i2c = max8998->iodev->i2c;
	int buck = rdev_get_id(rdev);
	int reg, shift = 0, mask, ret, j;
	static u8 buck1_last_val;

	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	if (ret)
	return ret;

	switch (buck) {
	case MAX8998_BUCK1:
	dev_dbg(max8998->dev,
	"BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
	"buck1_vol3:%d, buck1_vol4:%d\n",
	selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
	max8998->buck1_vol[2], max8998->buck1_vol[3]);

	if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {

	/* check if requested voltage */
	/* value is already defined */
	for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
	if (max8998->buck1_vol[j] == selector) {
	max8998->buck1_idx = j;
	buck1_gpio_set(max8998->buck1_gpio1,
	max8998->buck1_gpio2, j);
	goto buck1_exit;
	}
	}

	if (pdata->buck_voltage_lock)
	return -EINVAL;

	/* no predefine regulator found */
	max8998->buck1_idx = (buck1_last_val % 2) + 2;
	dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
	max8998->buck1_idx);
	max8998->buck1_vol[max8998->buck1_idx] = selector;
	ret = max8998_get_voltage_register(rdev, &reg,
	&shift,
	&mask);
	ret = max8998_write_reg(i2c, reg, selector);
	buck1_gpio_set(max8998->buck1_gpio1,
	max8998->buck1_gpio2, max8998->buck1_idx);
	buck1_last_val++;
	buck1_exit:
	dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
	i2c->name, gpiod_get_value(max8998->buck1_gpio1),
	gpiod_get_value(max8998->buck1_gpio2));
	break;
	} else {
	ret = max8998_write_reg(i2c, reg, selector);
	}
	break;

	case MAX8998_BUCK2:
	dev_dbg(max8998->dev,
	"BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
	selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
	if (max8998->buck2_gpio) {
	/* check if requested voltage */
	/* value is already defined */
	for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
	if (max8998->buck2_vol[j] == selector) {
	max8998->buck2_idx = j;
	buck2_gpio_set(max8998->buck2_gpio, j);
	goto buck2_exit;
	}
	}

	if (pdata->buck_voltage_lock)
	return -EINVAL;

	max8998_get_voltage_register(rdev,
	&reg, &shift, &mask);
	ret = max8998_write_reg(i2c, reg, selector);
	max8998->buck2_vol[max8998->buck2_idx] = selector;
	buck2_gpio_set(max8998->buck2_gpio, max8998->buck2_idx);
	buck2_exit:
	dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
	gpiod_get_value(max8998->buck2_gpio));
	} else {
	ret = max8998_write_reg(i2c, reg, selector);
	}
	break;

	case MAX8998_BUCK3:
	case MAX8998_BUCK4:
	ret = max8998_update_reg(i2c, reg, selector<<shift,
	mask<<shift);
	break;
	}

	return ret;
	}

	static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
	unsigned int old_selector,
	unsigned int new_selector)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int buck = rdev_get_id(rdev);
	u8 val = 0;
	int difference, ret;

	if (buck < MAX8998_BUCK1 \|\| buck > MAX8998_BUCK4)
	return -EINVAL;

	/* Voltage stabilization */
	ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
	if (ret)
	return ret;

	/* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
	/* MAX8998 has ENRAMP bit implemented, so test it*/
	if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
	return 0;

	difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
	if (difference > 0)
	return DIV_ROUND_UP(difference, (val & 0x0f) + 1);

	return 0;
	}

	static int max8998_set_current_limit(struct regulator_dev *rdev,
	int min_uA, int max_uA)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	unsigned int n_currents = rdev->desc->n_current_limits;
	int i, sel = -1;

	if (n_currents == 0)
	return -EINVAL;

	if (rdev->desc->curr_table) {
	const unsigned int *curr_table = rdev->desc->curr_table;
	bool ascend = curr_table[n_currents - 1] > curr_table[0];

	/* search for closest to maximum */
	if (ascend) {
	for (i = n_currents - 1; i >= 0; i--) {
	if (min_uA <= curr_table[i] &&
	curr_table[i] <= max_uA) {
	sel = i;
	break;
	}
	}
	} else {
	for (i = 0; i < n_currents; i++) {
	if (min_uA <= curr_table[i] &&
	curr_table[i] <= max_uA) {
	sel = i;
	break;
	}
	}
	}
	}

	if (sel < 0)
	return -EINVAL;

	sel <<= ffs(rdev->desc->csel_mask) - 1;

	return max8998_update_reg(i2c, rdev->desc->csel_reg,
	sel, rdev->desc->csel_mask);
	}

	static int max8998_get_current_limit(struct regulator_dev *rdev)
	{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	u8 val;
	int ret;

	ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
	if (ret != 0)
	return ret;

	val &= rdev->desc->csel_mask;
	val >>= ffs(rdev->desc->csel_mask) - 1;

	if (rdev->desc->curr_table) {
	if (val >= rdev->desc->n_current_limits)
	return -EINVAL;

	return rdev->desc->curr_table[val];
	}

	return -EINVAL;
	}

	static const struct regulator_ops max8998_ldo_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = max8998_ldo_is_enabled,
	.enable = max8998_ldo_enable,
	.disable = max8998_ldo_disable,
	.get_voltage_sel = max8998_get_voltage_sel,
	.set_voltage_sel = max8998_set_voltage_ldo_sel,
	};

	static const struct regulator_ops max8998_buck_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = max8998_ldo_is_enabled,
	.enable = max8998_ldo_enable,
	.disable = max8998_ldo_disable,
	.get_voltage_sel = max8998_get_voltage_sel,
	.set_voltage_sel = max8998_set_voltage_buck_sel,
	.set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
	};

	static const struct regulator_ops max8998_charger_ops = {
	.set_current_limit = max8998_set_current_limit,
	.get_current_limit = max8998_get_current_limit,
	.is_enabled = max8998_ldo_is_enabled_inverted,
	/* Swapped as register is inverted */
	.enable = max8998_ldo_disable,
	.disable = max8998_ldo_enable,
	};

	static const struct regulator_ops max8998_others_ops = {
	.is_enabled = max8998_ldo_is_enabled,
	.enable = max8998_ldo_enable,
	.disable = max8998_ldo_disable,
	};

	#define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
	{ \
	.name = #_name, \
	.id = MAX8998_##_name, \
	.ops = _ops, \
	.min_uV = (_min), \
	.uV_step = (_step), \
	.n_voltages = ((_max) - (_min)) / (_step) + 1, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	#define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
	{ \
	.name = #_name, \
	.id = MAX8998_##_name, \
	.ops = _ops, \
	.curr_table = _table, \
	.n_current_limits = ARRAY_SIZE(_table), \
	.csel_reg = _reg, \
	.csel_mask = _mask, \
	.type = REGULATOR_CURRENT, \
	.owner = THIS_MODULE, \
	}

	#define MAX8998_OTHERS_REG(_name, _id) \
	{ \
	.name = #_name, \
	.id = _id, \
	.ops = &max8998_others_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	static const struct regulator_desc regulators[] = {
	MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
	MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
	MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
	MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
	MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
	MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
	MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
	MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
	MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
	MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
	MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
	MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
	MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
	MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
	MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
	MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
	MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
	MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
	charger_current_table, MAX8998_REG_CHGR1, 0x7),
	};

	static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
	struct max8998_platform_data *pdata)
	{
	struct device_node *pmic_np = iodev->dev->of_node;
	struct device_node regulators_np, reg_np;
	struct max8998_regulator_data *rdata;
	unsigned int i;
	int ret;

	regulators_np = of_get_child_by_name(pmic_np, "regulators");
	if (!regulators_np) {
	dev_err(iodev->dev, "could not find regulators sub-node\n");
	return -EINVAL;
	}

	/* count the number of regulators to be supported in pmic */
	pdata->num_regulators = of_get_child_count(regulators_np);

	rdata = devm_kcalloc(iodev->dev,
	pdata->num_regulators, sizeof(*rdata),
	GFP_KERNEL);
	if (!rdata) {
	of_node_put(regulators_np);
	return -ENOMEM;
	}

	pdata->regulators = rdata;
	for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
	reg_np = of_get_child_by_name(regulators_np,
	regulators[i].name);
	if (!reg_np)
	continue;

	rdata->id = regulators[i].id;
	rdata->initdata = of_get_regulator_init_data(iodev->dev,
	reg_np,
	&regulators[i]);
	rdata->reg_node = reg_np;
	++rdata;
	}
	pdata->num_regulators = rdata - pdata->regulators;

	of_node_put(reg_np);
	of_node_put(regulators_np);

	pdata->buck_voltage_lock = of_property_read_bool(pmic_np, "max8998,pmic-buck-voltage-lock");

	ret = of_property_read_u32(pmic_np,
	"max8998,pmic-buck1-default-dvs-idx",
	&pdata->buck1_default_idx);
	if (!ret && pdata->buck1_default_idx >= 4) {
	pdata->buck1_default_idx = 0;
	dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
	}

	ret = of_property_read_u32(pmic_np,
	"max8998,pmic-buck2-default-dvs-idx",
	&pdata->buck2_default_idx);
	if (!ret && pdata->buck2_default_idx >= 2) {
	pdata->buck2_default_idx = 0;
	dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
	}

	ret = of_property_read_u32_array(pmic_np,
	"max8998,pmic-buck1-dvs-voltage",
	pdata->buck1_voltage,
	ARRAY_SIZE(pdata->buck1_voltage));
	if (ret) {
	dev_err(iodev->dev, "buck1 voltages not specified\n");
	return -EINVAL;
	}

	ret = of_property_read_u32_array(pmic_np,
	"max8998,pmic-buck2-dvs-voltage",
	pdata->buck2_voltage,
	ARRAY_SIZE(pdata->buck2_voltage));
	if (ret) {
	dev_err(iodev->dev, "buck2 voltages not specified\n");
	return -EINVAL;
	}

	return 0;
	}

	static int max8998_pmic_probe(struct platform_device *pdev)
	{
	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8998_platform_data *pdata = iodev->pdata;
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct max8998_data *max8998;
	struct i2c_client *i2c;
	enum gpiod_flags flags;
	int i, ret;
	unsigned int v;

	if (!pdata) {
	dev_err(pdev->dev.parent, "No platform init data supplied\n");
	return -ENODEV;
	}

	if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
	ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
	if (ret)
	return ret;
	}

	max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
	GFP_KERNEL);
	if (!max8998)
	return -ENOMEM;

	max8998->dev = &pdev->dev;
	max8998->iodev = iodev;
	max8998->num_regulators = pdata->num_regulators;
	platform_set_drvdata(pdev, max8998);
	i2c = max8998->iodev->i2c;

	max8998->buck1_idx = pdata->buck1_default_idx;
	max8998->buck2_idx = pdata->buck2_default_idx;

	/* Check if MAX8998 voltage selection GPIOs are defined */
	flags = (max8998->buck1_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	max8998->buck1_gpio1 = devm_gpiod_get_index_optional(iodev->dev,
	"max8998,pmic-buck1-dvs",
	0,
	flags);
	if (IS_ERR(max8998->buck1_gpio1))
	return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck1_gpio1),
	"could not get BUCK1 GPIO1\n");
	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK1_SET1");

	flags = (max8998->buck1_idx & BIT(1)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	max8998->buck1_gpio2 = devm_gpiod_get_index_optional(iodev->dev,
	"max8998,pmic-buck1-dvs",
	1,
	flags);
	if (IS_ERR(max8998->buck1_gpio2))
	return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck1_gpio2),
	"could not get BUCK1 GPIO2\n");
	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK1_SET2");

	flags = (max8998->buck2_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	max8998->buck2_gpio = devm_gpiod_get_index_optional(iodev->dev,
	"max8998,pmic-buck2-dvs",
	0,
	flags);
	if (IS_ERR(max8998->buck2_gpio))
	return dev_err_probe(&pdev->dev, PTR_ERR(max8998->buck2_gpio),
	"could not get BUCK2 GPIO\n");
	gpiod_set_consumer_name(max8998->buck1_gpio1, "MAX8998 BUCK2_SET3");

	if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {
	/* Set predefined values for BUCK1 registers */
	for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
	int index = MAX8998_BUCK1 - MAX8998_LDO2;

	i = 0;
	while (regulators[index].min_uV +
	regulators[index].uV_step * i
	< pdata->buck1_voltage[v])
	i++;

	max8998->buck1_vol[v] = i;
	ret = max8998_write_reg(i2c,
	MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
	if (ret)
	return ret;
	}
	}

	if (max8998->buck2_gpio) {
	/* Set predefined values for BUCK2 registers */
	for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
	int index = MAX8998_BUCK2 - MAX8998_LDO2;

	i = 0;
	while (regulators[index].min_uV +
	regulators[index].uV_step * i
	< pdata->buck2_voltage[v])
	i++;

	max8998->buck2_vol[v] = i;
	ret = max8998_write_reg(i2c,
	MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
	if (ret)
	return ret;
	}
	}

	for (i = 0; i < pdata->num_regulators; i++) {
	int index = pdata->regulators[i].id - MAX8998_LDO2;

	config.dev = max8998->dev;
	config.of_node = pdata->regulators[i].reg_node;
	config.init_data = pdata->regulators[i].initdata;
	config.driver_data = max8998;

	rdev = devm_regulator_register(&pdev->dev, &regulators[index],
	&config);
	if (IS_ERR(rdev)) {
	ret = PTR_ERR(rdev);
	dev_err(max8998->dev, "regulator %s init failed (%d)\n",
	regulators[index].name, ret);
	return ret;
	}
	}

	return 0;
	}

	static const struct platform_device_id max8998_pmic_id[] = {
	{ "max8998-pmic", TYPE_MAX8998 },
	{ "lp3974-pmic", TYPE_LP3974 },
	{ }
	};
	MODULE_DEVICE_TABLE(platform, max8998_pmic_id);

	static struct platform_driver max8998_pmic_driver = {
	.driver = {
	.name = "max8998-pmic",
	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	},
	.probe = max8998_pmic_probe,
	.id_table = max8998_pmic_id,
	};

	static int __init max8998_pmic_init(void)
	{
	return platform_driver_register(&max8998_pmic_driver);
	}
	subsys_initcall(max8998_pmic_init);

	static void __exit max8998_pmic_cleanup(void)
	{
	platform_driver_unregister(&max8998_pmic_driver);
	}
	module_exit(max8998_pmic_cleanup);

	MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	MODULE_LICENSE("GPL");