drivers/regulator/max77857-regulator.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2023 Analog Devices, Inc.
  * ADI Regulator driver for the MAX77857
  * MAX77859 and MAX77831.
  */
 #include <linux/bitfield.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/util_macros.h>

 #define MAX77857_REG_INT_SRC		0x10
 #define MAX77857_REG_INT_MASK		0x11
 #define MAX77857_REG_CONT1		0x12
 #define MAX77857_REG_CONT2		0x13
 #define MAX77857_REG_CONT3		0x14

 #define MAX77857_INT_SRC_OCP		BIT(0)
 #define MAX77857_INT_SRC_THS		BIT(1)
 #define MAX77857_INT_SRC_HARDSHORT	BIT(2)
 #define MAX77857_INT_SRC_OVP		BIT(3)
 #define MAX77857_INT_SRC_POK		BIT(4)

 #define MAX77857_ILIM_MASK		GENMASK(2, 0)
 #define MAX77857_CONT1_FREQ		GENMASK(4, 3)
 #define MAX77857_CONT3_FPWM		BIT(5)

 #define MAX77859_REG_INT_SRC		0x11
 #define MAX77859_REG_CONT1		0x13
 #define MAX77859_REG_CONT2		0x14
 #define MAX77859_REG_CONT3		0x15
 #define MAX77859_REG_CONT5		0x17
 #define MAX77859_CONT2_FPWM		BIT(2)
 #define MAX77859_CONT2_INTB		BIT(3)
 #define MAX77859_CONT3_DVS_START	BIT(2)
 #define MAX77859_VOLTAGE_SEL_MASK	GENMASK(9, 0)

 #define MAX77859_CURRENT_MIN		1000000
 #define MAX77859_CURRENT_MAX		5000000
 #define MAX77859_CURRENT_STEP		50000

 enum max77857_id {
 	ID_MAX77831 = 1,
 	ID_MAX77857,
 	ID_MAX77859,
 	ID_MAX77859A,
 };

 static bool max77857_volatile_reg(struct device *dev, unsigned int reg)
 {
 	enum max77857_id id = (uintptr_t)dev_get_drvdata(dev);

 	switch (id) {
 	case ID_MAX77831:
 	case ID_MAX77857:
 		return reg == MAX77857_REG_INT_SRC;
 	case ID_MAX77859:
 	case ID_MAX77859A:
 		return reg == MAX77859_REG_INT_SRC;
 	default:
 		return true;
 	}
 }

 static struct regmap_config max77857_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.cache_type = REGCACHE_MAPLE,
 	.volatile_reg = max77857_volatile_reg,
 };

 static int max77857_get_status(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;

 	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
 	if (ret)
 		return ret;

 	if (FIELD_GET(MAX77857_INT_SRC_POK, val))
 		return REGULATOR_STATUS_ON;

 	return REGULATOR_STATUS_ERROR;
 }

 static unsigned int max77857_get_mode(struct regulator_dev *rdev)
 {
 	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
 	unsigned int regval;
 	int ret;

 	switch (id) {
 	case ID_MAX77831:
 	case ID_MAX77857:
 		ret = regmap_read(rdev->regmap, MAX77857_REG_CONT3, &regval);
 		if (ret)
 			return ret;

 		if (FIELD_GET(MAX77857_CONT3_FPWM, regval))
 			return REGULATOR_MODE_FAST;

 		break;
 	case ID_MAX77859:
 	case ID_MAX77859A:
 		ret = regmap_read(rdev->regmap, MAX77859_REG_CONT2, &regval);
 		if (ret)
 			return ret;

 		if (FIELD_GET(MAX77859_CONT2_FPWM, regval))
 			return REGULATOR_MODE_FAST;

 		break;
 	default:
 		return -EINVAL;
 	}

 	return REGULATOR_MODE_NORMAL;
 }

 static int max77857_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
 	unsigned int reg, val;

 	switch (id) {
 	case ID_MAX77831:
 	case ID_MAX77857:
 		reg = MAX77857_REG_CONT3;
 		val = MAX77857_CONT3_FPWM;
 		break;
 	case ID_MAX77859:
 	case ID_MAX77859A:
 		reg = MAX77859_REG_CONT2;
 		val = MAX77859_CONT2_FPWM;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		return regmap_set_bits(rdev->regmap, reg, val);
 	case REGULATOR_MODE_NORMAL:
 		return regmap_clear_bits(rdev->regmap, reg, val);
 	default:
 		return -EINVAL;
 	}
 }

 static int max77857_get_error_flags(struct regulator_dev *rdev,
 				    unsigned int *flags)
 {
 	unsigned int val;
 	int ret;

 	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
 	if (ret)
 		return ret;

 	*flags = 0;

 	if (FIELD_GET(MAX77857_INT_SRC_OVP, val))
 		*flags |= REGULATOR_ERROR_OVER_VOLTAGE_WARN;

 	if (FIELD_GET(MAX77857_INT_SRC_OCP, val) ||
 	    FIELD_GET(MAX77857_INT_SRC_HARDSHORT, val))
 		*flags |= REGULATOR_ERROR_OVER_CURRENT;

 	if (FIELD_GET(MAX77857_INT_SRC_THS, val))
 		*flags |= REGULATOR_ERROR_OVER_TEMP;

 	if (!FIELD_GET(MAX77857_INT_SRC_POK, val))
 		*flags |= REGULATOR_ERROR_FAIL;

 	return 0;
 }

 static struct linear_range max77859_lin_ranges[] = {
 	REGULATOR_LINEAR_RANGE(3200000, 0x0A0, 0x320, 20000)
 };

 static const unsigned int max77859_ramp_table[4] = {
 	1000, 500, 250, 125
 };

 static int max77859_set_voltage_sel(struct regulator_dev *rdev,
 				    unsigned int sel)
 {
 	__be16 reg;
 	int ret;

 	reg = cpu_to_be16(sel);

 	ret = regmap_bulk_write(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
 	if (ret)
 		return ret;

 	/* actually apply new voltage */
 	return regmap_set_bits(rdev->regmap, MAX77859_REG_CONT3,
 			       MAX77859_CONT3_DVS_START);
 }

 static int max77859_get_voltage_sel(struct regulator_dev *rdev)
 {
 	__be16 reg;
 	int ret;

 	ret = regmap_bulk_read(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
 	if (ret)
 		return ret;

 	return FIELD_GET(MAX77859_VOLTAGE_SEL_MASK, __be16_to_cpu(reg));
 }

 static int max77859_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
 {
 	u32 selector;

 	if (max_uA < MAX77859_CURRENT_MIN)
 		return -EINVAL;

 	selector = 0x12 + (max_uA - MAX77859_CURRENT_MIN) / MAX77859_CURRENT_STEP;

 	selector = clamp_val(selector, 0x00, 0x7F);

 	return regmap_write(rdev->regmap, MAX77859_REG_CONT5, selector);
 }

 static int max77859_get_current_limit(struct regulator_dev *rdev)
 {
 	u32 selector;
 	int ret;

 	ret = regmap_read(rdev->regmap, MAX77859_REG_CONT5, &selector);
 	if (ret)
 		return ret;

 	if (selector <= 0x12)
 		return MAX77859_CURRENT_MIN;

 	if (selector >= 0x64)
 		return MAX77859_CURRENT_MAX;

 	return MAX77859_CURRENT_MIN + (selector - 0x12) * MAX77859_CURRENT_STEP;
 }

 static const struct regulator_ops max77859_regulator_ops = {
 	.list_voltage = regulator_list_voltage_linear_range,
 	.set_voltage_sel = max77859_set_voltage_sel,
 	.get_voltage_sel = max77859_get_voltage_sel,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 	.get_status = max77857_get_status,
 	.set_mode = max77857_set_mode,
 	.get_mode = max77857_get_mode,
 	.get_error_flags = max77857_get_error_flags,
 };

 static const struct regulator_ops max77859a_regulator_ops = {
 	.list_voltage = regulator_list_voltage_linear_range,
 	.set_voltage_sel = max77859_set_voltage_sel,
 	.get_voltage_sel = max77859_get_voltage_sel,
 	.set_current_limit = max77859_set_current_limit,
 	.get_current_limit = max77859_get_current_limit,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 	.get_status = max77857_get_status,
 	.set_mode = max77857_set_mode,
 	.get_mode = max77857_get_mode,
 	.get_error_flags = max77857_get_error_flags,
 };

 static const struct regulator_ops max77857_regulator_ops = {
 	.list_voltage = regulator_list_voltage_linear_range,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 	.get_status = max77857_get_status,
 	.set_mode = max77857_set_mode,
 	.get_mode = max77857_get_mode,
 	.get_error_flags = max77857_get_error_flags,
 };

 static struct linear_range max77857_lin_ranges[] = {
 	REGULATOR_LINEAR_RANGE(4485000, 0x3D, 0xCC, 73500)
 };

 static const unsigned int max77857_switch_freq[] = {
 	1200000, 1500000, 1800000, 2100000
 };

 #define RAMAP_DELAY_INIT_VAL 1333

 static const unsigned int max77857_ramp_table[2][4] = {
 	{ RAMAP_DELAY_INIT_VAL, 667, 333, 227 }, /* when switch freq is 1.8MHz or 2.1MHz */
 	{ 1166, 667, 333, 167 }, /* when switch freq is 1.2MHz or 1.5MHz */
 };

 static struct regulator_desc max77857_regulator_desc = {
 	.ops = &max77857_regulator_ops,
 	.name = "max77857",
 	.linear_ranges = max77857_lin_ranges,
 	.n_linear_ranges = ARRAY_SIZE(max77857_lin_ranges),
 	.vsel_mask = 0xFF,
 	.vsel_reg = MAX77857_REG_CONT2,
 	.ramp_delay_table = max77857_ramp_table[0],
 	.n_ramp_values = ARRAY_SIZE(max77857_ramp_table[0]),
 	.ramp_reg = MAX77857_REG_CONT3,
 	.ramp_mask = GENMASK(1, 0),
 	.ramp_delay = RAMAP_DELAY_INIT_VAL,
 	.owner = THIS_MODULE,
 };

 static void max77857_calc_range(struct device *dev, enum max77857_id id)
 {
 	struct linear_range *range;
 	unsigned long vref_step;
 	u32 rtop = 0;
 	u32 rbot = 0;

 	device_property_read_u32(dev, "adi,rtop-ohms", &rtop);
 	device_property_read_u32(dev, "adi,rbot-ohms", &rbot);

 	if (!rbot || !rtop)
 		return;

 	switch (id) {
 	case ID_MAX77831:
 	case ID_MAX77857:
 		range = max77857_lin_ranges;
 		vref_step = 4900UL;
 		break;
 	case ID_MAX77859:
 	case ID_MAX77859A:
 		range = max77859_lin_ranges;
 		vref_step = 1250UL;
 		break;
 	}

 	range->step = DIV_ROUND_CLOSEST(vref_step * (rbot + rtop), rbot);
 	range->min = range->step * range->min_sel;
 }

 static int max77857_probe(struct i2c_client *client)
 {
 	const struct i2c_device_id *i2c_id;
 	struct device *dev = &client->dev;
 	struct regulator_config cfg = { };
 	struct regulator_dev *rdev;
 	struct regmap *regmap;
 	enum max77857_id id;
 	u32 switch_freq = 0;
 	int ret;

 	i2c_id = i2c_client_get_device_id(client);
 	if (!i2c_id)
 		return -EINVAL;

 	id = i2c_id->driver_data;

 	dev_set_drvdata(dev, (void *)id);

 	if (id == ID_MAX77859 || id == ID_MAX77859A) {
 		max77857_regulator_desc.ops = &max77859_regulator_ops;
 		max77857_regulator_desc.linear_ranges = max77859_lin_ranges;
 		max77857_regulator_desc.ramp_delay_table = max77859_ramp_table;
 		max77857_regulator_desc.ramp_delay = max77859_ramp_table[0];
 	}

 	if (id == ID_MAX77859A)
 		max77857_regulator_desc.ops = &max77859a_regulator_ops;

 	max77857_calc_range(dev, id);

 	regmap = devm_regmap_init_i2c(client, &max77857_regmap_config);
 	if (IS_ERR(regmap))
 		return dev_err_probe(dev, PTR_ERR(regmap),
 				     "cannot initialize regmap\n");

 	device_property_read_u32(dev, "adi,switch-frequency-hz", &switch_freq);
 	if (switch_freq) {
 		switch_freq = find_closest(switch_freq, max77857_switch_freq,
 					   ARRAY_SIZE(max77857_switch_freq));

 		if (id == ID_MAX77831 && switch_freq == 3)
 			switch_freq = 2;

 		switch (id) {
 		case ID_MAX77831:
 		case ID_MAX77857:
 			ret = regmap_update_bits(regmap, MAX77857_REG_CONT1,
 						 MAX77857_CONT1_FREQ, switch_freq);

 			if (switch_freq >= 2)
 				break;

 			max77857_regulator_desc.ramp_delay_table = max77857_ramp_table[1];
 			max77857_regulator_desc.ramp_delay = max77857_ramp_table[1][0];
 			break;
 		case ID_MAX77859:
 		case ID_MAX77859A:
 			ret = regmap_update_bits(regmap, MAX77859_REG_CONT1,
 						 MAX77857_CONT1_FREQ, switch_freq);
 			break;
 		}
 		if (ret)
 			return ret;
 	}

 	cfg.dev = dev;
 	cfg.driver_data = (void *)id;
 	cfg.regmap = regmap;
 	cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
 						   &max77857_regulator_desc);
 	if (!cfg.init_data)
 		return -ENOMEM;

 	rdev = devm_regulator_register(dev, &max77857_regulator_desc, &cfg);
 	if (IS_ERR(rdev))
 		return dev_err_probe(dev, PTR_ERR(rdev),
 				     "cannot register regulator\n");

 	return 0;
 }

 const struct i2c_device_id max77857_id[] = {
 	{ "max77831", ID_MAX77831 },
 	{ "max77857", ID_MAX77857 },
 	{ "max77859", ID_MAX77859 },
 	{ "max77859a", ID_MAX77859A },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max77857_id);

 static const struct of_device_id max77857_of_id[] = {
 	{ .compatible = "adi,max77831", .data = (void *)ID_MAX77831 },
 	{ .compatible = "adi,max77857", .data = (void *)ID_MAX77857 },
 	{ .compatible = "adi,max77859", .data = (void *)ID_MAX77859 },
 	{ .compatible = "adi,max77859a", .data = (void *)ID_MAX77859A },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, max77857_of_id);

 static struct i2c_driver max77857_driver = {
 	.driver = {
 		.name = "max77857",
 		.of_match_table = max77857_of_id,
 	},
 	.id_table = max77857_id,
 	.probe = max77857_probe,
 };
 module_i2c_driver(max77857_driver);

 MODULE_DESCRIPTION("Analog Devices MAX77857 Buck-Boost Converter Driver");
 MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@analog.com>");
 MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2023 Analog Devices, Inc.
	* ADI Regulator driver for the MAX77857
	* MAX77859 and MAX77831.
	*/
	#include <linux/bitfield.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/util_macros.h>

	#define MAX77857_REG_INT_SRC 0x10
	#define MAX77857_REG_INT_MASK 0x11
	#define MAX77857_REG_CONT1 0x12
	#define MAX77857_REG_CONT2 0x13
	#define MAX77857_REG_CONT3 0x14

	#define MAX77857_INT_SRC_OCP BIT(0)
	#define MAX77857_INT_SRC_THS BIT(1)
	#define MAX77857_INT_SRC_HARDSHORT BIT(2)
	#define MAX77857_INT_SRC_OVP BIT(3)
	#define MAX77857_INT_SRC_POK BIT(4)

	#define MAX77857_ILIM_MASK GENMASK(2, 0)
	#define MAX77857_CONT1_FREQ GENMASK(4, 3)
	#define MAX77857_CONT3_FPWM BIT(5)

	#define MAX77859_REG_INT_SRC 0x11
	#define MAX77859_REG_CONT1 0x13
	#define MAX77859_REG_CONT2 0x14
	#define MAX77859_REG_CONT3 0x15
	#define MAX77859_REG_CONT5 0x17
	#define MAX77859_CONT2_FPWM BIT(2)
	#define MAX77859_CONT2_INTB BIT(3)
	#define MAX77859_CONT3_DVS_START BIT(2)
	#define MAX77859_VOLTAGE_SEL_MASK GENMASK(9, 0)

	#define MAX77859_CURRENT_MIN 1000000
	#define MAX77859_CURRENT_MAX 5000000
	#define MAX77859_CURRENT_STEP 50000

	enum max77857_id {
	ID_MAX77831 = 1,
	ID_MAX77857,
	ID_MAX77859,
	ID_MAX77859A,
	};

	static bool max77857_volatile_reg(struct device *dev, unsigned int reg)
	{
	enum max77857_id id = (uintptr_t)dev_get_drvdata(dev);

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
	return reg == MAX77857_REG_INT_SRC;
	case ID_MAX77859:
	case ID_MAX77859A:
	return reg == MAX77859_REG_INT_SRC;
	default:
	return true;
	}
	}

	static struct regmap_config max77857_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_MAPLE,
	.volatile_reg = max77857_volatile_reg,
	};

	static int max77857_get_status(struct regulator_dev *rdev)
	{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
	if (ret)
	return ret;

	if (FIELD_GET(MAX77857_INT_SRC_POK, val))
	return REGULATOR_STATUS_ON;

	return REGULATOR_STATUS_ERROR;
	}

	static unsigned int max77857_get_mode(struct regulator_dev *rdev)
	{
	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
	unsigned int regval;
	int ret;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
	ret = regmap_read(rdev->regmap, MAX77857_REG_CONT3, &regval);
	if (ret)
	return ret;

	if (FIELD_GET(MAX77857_CONT3_FPWM, regval))
	return REGULATOR_MODE_FAST;

	break;
	case ID_MAX77859:
	case ID_MAX77859A:
	ret = regmap_read(rdev->regmap, MAX77859_REG_CONT2, &regval);
	if (ret)
	return ret;

	if (FIELD_GET(MAX77859_CONT2_FPWM, regval))
	return REGULATOR_MODE_FAST;

	break;
	default:
	return -EINVAL;
	}

	return REGULATOR_MODE_NORMAL;
	}

	static int max77857_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
	unsigned int reg, val;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
	reg = MAX77857_REG_CONT3;
	val = MAX77857_CONT3_FPWM;
	break;
	case ID_MAX77859:
	case ID_MAX77859A:
	reg = MAX77859_REG_CONT2;
	val = MAX77859_CONT2_FPWM;
	break;
	default:
	return -EINVAL;
	}

	switch (mode) {
	case REGULATOR_MODE_FAST:
	return regmap_set_bits(rdev->regmap, reg, val);
	case REGULATOR_MODE_NORMAL:
	return regmap_clear_bits(rdev->regmap, reg, val);
	default:
	return -EINVAL;
	}
	}

	static int max77857_get_error_flags(struct regulator_dev *rdev,
	unsigned int *flags)
	{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
	if (ret)
	return ret;

	*flags = 0;

	if (FIELD_GET(MAX77857_INT_SRC_OVP, val))
	*flags \|= REGULATOR_ERROR_OVER_VOLTAGE_WARN;

	if (FIELD_GET(MAX77857_INT_SRC_OCP, val) \|\|
	FIELD_GET(MAX77857_INT_SRC_HARDSHORT, val))
	*flags \|= REGULATOR_ERROR_OVER_CURRENT;

	if (FIELD_GET(MAX77857_INT_SRC_THS, val))
	*flags \|= REGULATOR_ERROR_OVER_TEMP;

	if (!FIELD_GET(MAX77857_INT_SRC_POK, val))
	*flags \|= REGULATOR_ERROR_FAIL;

	return 0;
	}

	static struct linear_range max77859_lin_ranges[] = {
	REGULATOR_LINEAR_RANGE(3200000, 0x0A0, 0x320, 20000)
	};

	static const unsigned int max77859_ramp_table[4] = {
	1000, 500, 250, 125
	};

	static int max77859_set_voltage_sel(struct regulator_dev *rdev,
	unsigned int sel)
	{
	__be16 reg;
	int ret;

	reg = cpu_to_be16(sel);

	ret = regmap_bulk_write(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
	if (ret)
	return ret;

	/* actually apply new voltage */
	return regmap_set_bits(rdev->regmap, MAX77859_REG_CONT3,
	MAX77859_CONT3_DVS_START);
	}

	static int max77859_get_voltage_sel(struct regulator_dev *rdev)
	{
	__be16 reg;
	int ret;

	ret = regmap_bulk_read(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
	if (ret)
	return ret;

	return FIELD_GET(MAX77859_VOLTAGE_SEL_MASK, __be16_to_cpu(reg));
	}

	static int max77859_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
	{
	u32 selector;

	if (max_uA < MAX77859_CURRENT_MIN)
	return -EINVAL;

	selector = 0x12 + (max_uA - MAX77859_CURRENT_MIN) / MAX77859_CURRENT_STEP;

	selector = clamp_val(selector, 0x00, 0x7F);

	return regmap_write(rdev->regmap, MAX77859_REG_CONT5, selector);
	}

	static int max77859_get_current_limit(struct regulator_dev *rdev)
	{
	u32 selector;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77859_REG_CONT5, &selector);
	if (ret)
	return ret;

	if (selector <= 0x12)
	return MAX77859_CURRENT_MIN;

	if (selector >= 0x64)
	return MAX77859_CURRENT_MAX;

	return MAX77859_CURRENT_MIN + (selector - 0x12) * MAX77859_CURRENT_STEP;
	}

	static const struct regulator_ops max77859_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = max77859_set_voltage_sel,
	.get_voltage_sel = max77859_get_voltage_sel,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
	};

	static const struct regulator_ops max77859a_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = max77859_set_voltage_sel,
	.get_voltage_sel = max77859_get_voltage_sel,
	.set_current_limit = max77859_set_current_limit,
	.get_current_limit = max77859_get_current_limit,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
	};

	static const struct regulator_ops max77857_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
	};

	static struct linear_range max77857_lin_ranges[] = {
	REGULATOR_LINEAR_RANGE(4485000, 0x3D, 0xCC, 73500)
	};

	static const unsigned int max77857_switch_freq[] = {
	1200000, 1500000, 1800000, 2100000
	};

	#define RAMAP_DELAY_INIT_VAL 1333

	static const unsigned int max77857_ramp_table[2][4] = {
	{ RAMAP_DELAY_INIT_VAL, 667, 333, 227 }, /* when switch freq is 1.8MHz or 2.1MHz */
	{ 1166, 667, 333, 167 }, /* when switch freq is 1.2MHz or 1.5MHz */
	};

	static struct regulator_desc max77857_regulator_desc = {
	.ops = &max77857_regulator_ops,
	.name = "max77857",
	.linear_ranges = max77857_lin_ranges,
	.n_linear_ranges = ARRAY_SIZE(max77857_lin_ranges),
	.vsel_mask = 0xFF,
	.vsel_reg = MAX77857_REG_CONT2,
	.ramp_delay_table = max77857_ramp_table[0],
	.n_ramp_values = ARRAY_SIZE(max77857_ramp_table[0]),
	.ramp_reg = MAX77857_REG_CONT3,
	.ramp_mask = GENMASK(1, 0),
	.ramp_delay = RAMAP_DELAY_INIT_VAL,
	.owner = THIS_MODULE,
	};

	static void max77857_calc_range(struct device *dev, enum max77857_id id)
	{
	struct linear_range *range;
	unsigned long vref_step;
	u32 rtop = 0;
	u32 rbot = 0;

	device_property_read_u32(dev, "adi,rtop-ohms", &rtop);
	device_property_read_u32(dev, "adi,rbot-ohms", &rbot);

	if (!rbot \|\| !rtop)
	return;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
	range = max77857_lin_ranges;
	vref_step = 4900UL;
	break;
	case ID_MAX77859:
	case ID_MAX77859A:
	range = max77859_lin_ranges;
	vref_step = 1250UL;
	break;
	}

	range->step = DIV_ROUND_CLOSEST(vref_step * (rbot + rtop), rbot);
	range->min = range->step * range->min_sel;
	}

	static int max77857_probe(struct i2c_client *client)
	{
	const struct i2c_device_id *i2c_id;
	struct device *dev = &client->dev;
	struct regulator_config cfg = { };
	struct regulator_dev *rdev;
	struct regmap *regmap;
	enum max77857_id id;
	u32 switch_freq = 0;
	int ret;

	i2c_id = i2c_client_get_device_id(client);
	if (!i2c_id)
	return -EINVAL;

	id = i2c_id->driver_data;

	dev_set_drvdata(dev, (void *)id);

	if (id == ID_MAX77859 \|\| id == ID_MAX77859A) {
	max77857_regulator_desc.ops = &max77859_regulator_ops;
	max77857_regulator_desc.linear_ranges = max77859_lin_ranges;
	max77857_regulator_desc.ramp_delay_table = max77859_ramp_table;
	max77857_regulator_desc.ramp_delay = max77859_ramp_table[0];
	}

	if (id == ID_MAX77859A)
	max77857_regulator_desc.ops = &max77859a_regulator_ops;

	max77857_calc_range(dev, id);

	regmap = devm_regmap_init_i2c(client, &max77857_regmap_config);
	if (IS_ERR(regmap))
	return dev_err_probe(dev, PTR_ERR(regmap),
	"cannot initialize regmap\n");

	device_property_read_u32(dev, "adi,switch-frequency-hz", &switch_freq);
	if (switch_freq) {
	switch_freq = find_closest(switch_freq, max77857_switch_freq,
	ARRAY_SIZE(max77857_switch_freq));

	if (id == ID_MAX77831 && switch_freq == 3)
	switch_freq = 2;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
	ret = regmap_update_bits(regmap, MAX77857_REG_CONT1,
	MAX77857_CONT1_FREQ, switch_freq);

	if (switch_freq >= 2)
	break;

	max77857_regulator_desc.ramp_delay_table = max77857_ramp_table[1];
	max77857_regulator_desc.ramp_delay = max77857_ramp_table[1][0];
	break;
	case ID_MAX77859:
	case ID_MAX77859A:
	ret = regmap_update_bits(regmap, MAX77859_REG_CONT1,
	MAX77857_CONT1_FREQ, switch_freq);
	break;
	}
	if (ret)
	return ret;
	}

	cfg.dev = dev;
	cfg.driver_data = (void *)id;
	cfg.regmap = regmap;
	cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
	&max77857_regulator_desc);
	if (!cfg.init_data)
	return -ENOMEM;

	rdev = devm_regulator_register(dev, &max77857_regulator_desc, &cfg);
	if (IS_ERR(rdev))
	return dev_err_probe(dev, PTR_ERR(rdev),
	"cannot register regulator\n");

	return 0;
	}

	const struct i2c_device_id max77857_id[] = {
	{ "max77831", ID_MAX77831 },
	{ "max77857", ID_MAX77857 },
	{ "max77859", ID_MAX77859 },
	{ "max77859a", ID_MAX77859A },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, max77857_id);

	static const struct of_device_id max77857_of_id[] = {
	{ .compatible = "adi,max77831", .data = (void *)ID_MAX77831 },
	{ .compatible = "adi,max77857", .data = (void *)ID_MAX77857 },
	{ .compatible = "adi,max77859", .data = (void *)ID_MAX77859 },
	{ .compatible = "adi,max77859a", .data = (void *)ID_MAX77859A },
	{ }
	};
	MODULE_DEVICE_TABLE(of, max77857_of_id);

	static struct i2c_driver max77857_driver = {
	.driver = {
	.name = "max77857",
	.of_match_table = max77857_of_id,
	},
	.id_table = max77857_id,
	.probe = max77857_probe,
	};
	module_i2c_driver(max77857_driver);

	MODULE_DESCRIPTION("Analog Devices MAX77857 Buck-Boost Converter Driver");
	MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@analog.com>");
	MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
	MODULE_LICENSE("GPL");