drivers/regulator/pv88090-regulator.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // pv88090-regulator.c - Regulator device driver for PV88090
 // Copyright (C) 2015  Powerventure Semiconductor Ltd.

 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regmap.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/regulator/of_regulator.h>
 #include "pv88090-regulator.h"

 #define PV88090_MAX_REGULATORS	5

 /* PV88090 REGULATOR IDs */
 enum {
 	/* BUCKs */
 	PV88090_ID_BUCK1,
 	PV88090_ID_BUCK2,
 	PV88090_ID_BUCK3,

 	/* LDOs */
 	PV88090_ID_LDO1,
 	PV88090_ID_LDO2,
 };

 struct pv88090_regulator {
 	struct regulator_desc desc;
 	unsigned int conf;
 	unsigned int conf2;
 };

 struct pv88090 {
 	struct device *dev;
 	struct regmap *regmap;
 	struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
 };

 struct pv88090_buck_voltage {
 	int min_uV;
 	int max_uV;
 	int uV_step;
 };

 static const struct regmap_config pv88090_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
  *  Entry indexes corresponds to register values.
  */

 static const unsigned int pv88090_buck1_limits[] = {
 	 220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
 	1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
 	3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
 	5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
 };

 static const unsigned int pv88090_buck23_limits[] = {
 	1496000, 2393000, 3291000, 4189000
 };

 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
 	{
 		.min_uV = 600000,
 		.max_uV = 1393750,
 		.uV_step = 6250,
 	},

 	{
 		.min_uV = 1400000,
 		.max_uV = 2193750,
 		.uV_step = 6250,
 	},
 	{
 		.min_uV = 1250000,
 		.max_uV = 2837500,
 		.uV_step = 12500,
 	},
 };

 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
 {
 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 	unsigned int data;
 	int ret, mode = 0;

 	ret = regmap_read(rdev->regmap, info->conf, &data);
 	if (ret < 0)
 		return ret;

 	switch (data & PV88090_BUCK1_MODE_MASK) {
 	case PV88090_BUCK_MODE_SYNC:
 		mode = REGULATOR_MODE_FAST;
 		break;
 	case PV88090_BUCK_MODE_AUTO:
 		mode = REGULATOR_MODE_NORMAL;
 		break;
 	case PV88090_BUCK_MODE_SLEEP:
 		mode = REGULATOR_MODE_STANDBY;
 		break;
 	}

 	return mode;
 }

 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
 					unsigned int mode)
 {
 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 	int val = 0;

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		val = PV88090_BUCK_MODE_SYNC;
 		break;
 	case REGULATOR_MODE_NORMAL:
 		val = PV88090_BUCK_MODE_AUTO;
 		break;
 	case REGULATOR_MODE_STANDBY:
 		val = PV88090_BUCK_MODE_SLEEP;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return regmap_update_bits(rdev->regmap, info->conf,
 					PV88090_BUCK1_MODE_MASK, val);
 }

 static const struct regulator_ops pv88090_buck_ops = {
 	.get_mode = pv88090_buck_get_mode,
 	.set_mode = pv88090_buck_set_mode,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.list_voltage = regulator_list_voltage_linear,
 	.set_current_limit = regulator_set_current_limit_regmap,
 	.get_current_limit = regulator_get_current_limit_regmap,
 };

 static const struct regulator_ops pv88090_ldo_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.list_voltage = regulator_list_voltage_linear,
 };

 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
 {\
 	.desc	=	{\
 		.id = chip##_ID_##regl_name,\
 		.name = __stringify(chip##_##regl_name),\
 		.of_match = of_match_ptr(#regl_name),\
 		.regulators_node = of_match_ptr("regulators"),\
 		.type = REGULATOR_VOLTAGE,\
 		.owner = THIS_MODULE,\
 		.ops = &pv88090_buck_ops,\
 		.min_uV = min, \
 		.uV_step = step, \
 		.n_voltages = ((max) - (min))/(step) + 1, \
 		.enable_reg = PV88090_REG_##regl_name##_CONF0, \
 		.enable_mask = PV88090_##regl_name##_EN, \
 		.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
 		.vsel_mask = PV88090_V##regl_name##_MASK, \
 		.curr_table = limits_array, \
 		.n_current_limits = ARRAY_SIZE(limits_array), \
 		.csel_reg = PV88090_REG_##regl_name##_CONF1, \
 		.csel_mask = PV88090_##regl_name##_ILIM_MASK, \
 	},\
 	.conf = PV88090_REG_##regl_name##_CONF1, \
 	.conf2 = PV88090_REG_##regl_name##_CONF2, \
 }

 #define PV88090_LDO(chip, regl_name, min, step, max) \
 {\
 	.desc	=	{\
 		.id = chip##_ID_##regl_name,\
 		.name = __stringify(chip##_##regl_name),\
 		.of_match = of_match_ptr(#regl_name),\
 		.regulators_node = of_match_ptr("regulators"),\
 		.type = REGULATOR_VOLTAGE,\
 		.owner = THIS_MODULE,\
 		.ops = &pv88090_ldo_ops,\
 		.min_uV = min, \
 		.uV_step = step, \
 		.n_voltages = ((max) - (min))/(step) + 1, \
 		.enable_reg = PV88090_REG_##regl_name##_CONT, \
 		.enable_mask = PV88090_##regl_name##_EN, \
 		.vsel_reg = PV88090_REG_##regl_name##_CONT, \
 		.vsel_mask = PV88090_V##regl_name##_MASK, \
 	},\
 }

 static struct pv88090_regulator pv88090_regulator_info[] = {
 	PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
 		pv88090_buck1_limits),
 	PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
 		pv88090_buck23_limits),
 	PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
 		pv88090_buck23_limits),
 	PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
 	PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
 };

 static irqreturn_t pv88090_irq_handler(int irq, void *data)
 {
 	struct pv88090 *chip = data;
 	int i, reg_val, err, ret = IRQ_NONE;

 	err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
 	if (err < 0)
 		goto error_i2c;

 	if (reg_val & PV88090_E_VDD_FLT) {
 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 			if (chip->rdev[i] != NULL) {
 			        regulator_lock(chip->rdev[i]);
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_UNDER_VOLTAGE,
 					NULL);
 			        regulator_unlock(chip->rdev[i]);
 			}
 		}

 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 			PV88090_E_VDD_FLT);
 		if (err < 0)
 			goto error_i2c;

 		ret = IRQ_HANDLED;
 	}

 	if (reg_val & PV88090_E_OVER_TEMP) {
 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 			if (chip->rdev[i] != NULL) {
 			        regulator_lock(chip->rdev[i]);
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_OVER_TEMP,
 					NULL);
 			        regulator_unlock(chip->rdev[i]);
 			}
 		}

 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 			PV88090_E_OVER_TEMP);
 		if (err < 0)
 			goto error_i2c;

 		ret = IRQ_HANDLED;
 	}

 	return ret;

 error_i2c:
 	dev_err(chip->dev, "I2C error : %d\n", err);
 	return IRQ_NONE;
 }

 /*
  * I2C driver interface functions
  */
 static int pv88090_i2c_probe(struct i2c_client *i2c)
 {
 	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 	struct pv88090 *chip;
 	struct regulator_config config = { };
 	int error, i, ret = 0;
 	unsigned int conf2, range, index;

 	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	chip->dev = &i2c->dev;
 	chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
 	if (IS_ERR(chip->regmap)) {
 		error = PTR_ERR(chip->regmap);
 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
 			error);
 		return error;
 	}

 	i2c_set_clientdata(i2c, chip);

 	if (i2c->irq != 0) {
 		ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
 		if (ret < 0) {
 			dev_err(chip->dev,
 				"Failed to mask A reg: %d\n", ret);
 			return ret;
 		}

 		ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
 		if (ret < 0) {
 			dev_err(chip->dev,
 				"Failed to mask B reg: %d\n", ret);
 			return ret;
 		}

 		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 					pv88090_irq_handler,
 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 					"pv88090", chip);
 		if (ret != 0) {
 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
 				i2c->irq);
 			return ret;
 		}

 		ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
 			PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
 		if (ret < 0) {
 			dev_err(chip->dev,
 				"Failed to update mask reg: %d\n", ret);
 			return ret;
 		}

 	} else {
 		dev_warn(chip->dev, "No IRQ configured\n");
 	}

 	config.dev = chip->dev;
 	config.regmap = chip->regmap;

 	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 		if (init_data)
 			config.init_data = &init_data[i];

 		if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
 			ret = regmap_read(chip->regmap,
 				pv88090_regulator_info[i].conf2, &conf2);
 			if (ret < 0)
 				return ret;

 			conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
 				PV88090_BUCK_VDAC_RANGE_MASK;

 			ret = regmap_read(chip->regmap,
 				PV88090_REG_BUCK_FOLD_RANGE, &range);
 			if (ret < 0)
 				return ret;

 			range = (range >>
 				 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
 				PV88090_BUCK_VRANGE_GAIN_MASK;
 			index = ((range << 1) | conf2);
 			if (index > PV88090_ID_BUCK3) {
 				dev_err(chip->dev,
 					"Invalid index(%d)\n", index);
 				return -EINVAL;
 			}

 			pv88090_regulator_info[i].desc.min_uV
 				= pv88090_buck_vol[index].min_uV;
 			pv88090_regulator_info[i].desc.uV_step
 				= pv88090_buck_vol[index].uV_step;
 			pv88090_regulator_info[i].desc.n_voltages
 				= ((pv88090_buck_vol[index].max_uV)
 				- (pv88090_buck_vol[index].min_uV))
 				/(pv88090_buck_vol[index].uV_step) + 1;
 		}

 		config.driver_data = (void *)&pv88090_regulator_info[i];
 		chip->rdev[i] = devm_regulator_register(chip->dev,
 			&pv88090_regulator_info[i].desc, &config);
 		if (IS_ERR(chip->rdev[i])) {
 			dev_err(chip->dev,
 				"Failed to register PV88090 regulator\n");
 			return PTR_ERR(chip->rdev[i]);
 		}
 	}

 	return 0;
 }

 static const struct i2c_device_id pv88090_i2c_id[] = {
 	{"pv88090", 0},
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);

 #ifdef CONFIG_OF
 static const struct of_device_id pv88090_dt_ids[] = {
 	{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
 	{},
 };
 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
 #endif

 static struct i2c_driver pv88090_regulator_driver = {
 	.driver = {
 		.name = "pv88090",
 		.of_match_table = of_match_ptr(pv88090_dt_ids),
 	},
 	.probe_new = pv88090_i2c_probe,
 	.id_table = pv88090_i2c_id,
 };

 module_i2c_driver(pv88090_regulator_driver);

 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	//
	// pv88090-regulator.c - Regulator device driver for PV88090
	// Copyright (C) 2015 Powerventure Semiconductor Ltd.

	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regmap.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/regulator/of_regulator.h>
	#include "pv88090-regulator.h"

	#define PV88090_MAX_REGULATORS 5

	/* PV88090 REGULATOR IDs */
	enum {
	/* BUCKs */
	PV88090_ID_BUCK1,
	PV88090_ID_BUCK2,
	PV88090_ID_BUCK3,

	/* LDOs */
	PV88090_ID_LDO1,
	PV88090_ID_LDO2,
	};

	struct pv88090_regulator {
	struct regulator_desc desc;
	unsigned int conf;
	unsigned int conf2;
	};

	struct pv88090 {
	struct device *dev;
	struct regmap *regmap;
	struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
	};

	struct pv88090_buck_voltage {
	int min_uV;
	int max_uV;
	int uV_step;
	};

	static const struct regmap_config pv88090_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
	* Entry indexes corresponds to register values.
	*/

	static const unsigned int pv88090_buck1_limits[] = {
	220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
	1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
	3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
	5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
	};

	static const unsigned int pv88090_buck23_limits[] = {
	1496000, 2393000, 3291000, 4189000
	};

	static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
	{
	.min_uV = 600000,
	.max_uV = 1393750,
	.uV_step = 6250,
	},

	{
	.min_uV = 1400000,
	.max_uV = 2193750,
	.uV_step = 6250,
	},
	{
	.min_uV = 1250000,
	.max_uV = 2837500,
	.uV_step = 12500,
	},
	};

	static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
	{
	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret, mode = 0;

	ret = regmap_read(rdev->regmap, info->conf, &data);
	if (ret < 0)
	return ret;

	switch (data & PV88090_BUCK1_MODE_MASK) {
	case PV88090_BUCK_MODE_SYNC:
	mode = REGULATOR_MODE_FAST;
	break;
	case PV88090_BUCK_MODE_AUTO:
	mode = REGULATOR_MODE_NORMAL;
	break;
	case PV88090_BUCK_MODE_SLEEP:
	mode = REGULATOR_MODE_STANDBY;
	break;
	}

	return mode;
	}

	static int pv88090_buck_set_mode(struct regulator_dev *rdev,
	unsigned int mode)
	{
	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
	val = PV88090_BUCK_MODE_SYNC;
	break;
	case REGULATOR_MODE_NORMAL:
	val = PV88090_BUCK_MODE_AUTO;
	break;
	case REGULATOR_MODE_STANDBY:
	val = PV88090_BUCK_MODE_SLEEP;
	break;
	default:
	return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, info->conf,
	PV88090_BUCK1_MODE_MASK, val);
	}

	static const struct regulator_ops pv88090_buck_ops = {
	.get_mode = pv88090_buck_get_mode,
	.set_mode = pv88090_buck_set_mode,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_current_limit = regulator_set_current_limit_regmap,
	.get_current_limit = regulator_get_current_limit_regmap,
	};

	static const struct regulator_ops pv88090_ldo_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	};

	#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
	{\
	.desc = {\
	.id = chip##_ID_##regl_name,\
	.name = __stringify(chip##_##regl_name),\
	.of_match = of_match_ptr(#regl_name),\
	.regulators_node = of_match_ptr("regulators"),\
	.type = REGULATOR_VOLTAGE,\
	.owner = THIS_MODULE,\
	.ops = &pv88090_buck_ops,\
	.min_uV = min, \
	.uV_step = step, \
	.n_voltages = ((max) - (min))/(step) + 1, \
	.enable_reg = PV88090_REG_##regl_name##_CONF0, \
	.enable_mask = PV88090_##regl_name##_EN, \
	.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
	.vsel_mask = PV88090_V##regl_name##_MASK, \
	.curr_table = limits_array, \
	.n_current_limits = ARRAY_SIZE(limits_array), \
	.csel_reg = PV88090_REG_##regl_name##_CONF1, \
	.csel_mask = PV88090_##regl_name##_ILIM_MASK, \
	},\
	.conf = PV88090_REG_##regl_name##_CONF1, \
	.conf2 = PV88090_REG_##regl_name##_CONF2, \
	}

	#define PV88090_LDO(chip, regl_name, min, step, max) \
	{\
	.desc = {\
	.id = chip##_ID_##regl_name,\
	.name = __stringify(chip##_##regl_name),\
	.of_match = of_match_ptr(#regl_name),\
	.regulators_node = of_match_ptr("regulators"),\
	.type = REGULATOR_VOLTAGE,\
	.owner = THIS_MODULE,\
	.ops = &pv88090_ldo_ops,\
	.min_uV = min, \
	.uV_step = step, \
	.n_voltages = ((max) - (min))/(step) + 1, \
	.enable_reg = PV88090_REG_##regl_name##_CONT, \
	.enable_mask = PV88090_##regl_name##_EN, \
	.vsel_reg = PV88090_REG_##regl_name##_CONT, \
	.vsel_mask = PV88090_V##regl_name##_MASK, \
	},\
	}

	static struct pv88090_regulator pv88090_regulator_info[] = {
	PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
	pv88090_buck1_limits),
	PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
	pv88090_buck23_limits),
	PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
	pv88090_buck23_limits),
	PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
	PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
	};

	static irqreturn_t pv88090_irq_handler(int irq, void *data)
	{
	struct pv88090 *chip = data;
	int i, reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
	if (err < 0)
	goto error_i2c;

	if (reg_val & PV88090_E_VDD_FLT) {
	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
	if (chip->rdev[i] != NULL) {
	regulator_lock(chip->rdev[i]);
	regulator_notifier_call_chain(chip->rdev[i],
	REGULATOR_EVENT_UNDER_VOLTAGE,
	NULL);
	regulator_unlock(chip->rdev[i]);
	}
	}

	err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
	PV88090_E_VDD_FLT);
	if (err < 0)
	goto error_i2c;

	ret = IRQ_HANDLED;
	}

	if (reg_val & PV88090_E_OVER_TEMP) {
	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
	if (chip->rdev[i] != NULL) {
	regulator_lock(chip->rdev[i]);
	regulator_notifier_call_chain(chip->rdev[i],
	REGULATOR_EVENT_OVER_TEMP,
	NULL);
	regulator_unlock(chip->rdev[i]);
	}
	}

	err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
	PV88090_E_OVER_TEMP);
	if (err < 0)
	goto error_i2c;

	ret = IRQ_HANDLED;
	}

	return ret;

	error_i2c:
	dev_err(chip->dev, "I2C error : %d\n", err);
	return IRQ_NONE;
	}

	/*
	* I2C driver interface functions
	*/
	static int pv88090_i2c_probe(struct i2c_client *i2c)
	{
	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
	struct pv88090 *chip;
	struct regulator_config config = { };
	int error, i, ret = 0;
	unsigned int conf2, range, index;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	chip->dev = &i2c->dev;
	chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
	if (IS_ERR(chip->regmap)) {
	error = PTR_ERR(chip->regmap);
	dev_err(chip->dev, "Failed to allocate register map: %d\n",
	error);
	return error;
	}

	i2c_set_clientdata(i2c, chip);

	if (i2c->irq != 0) {
	ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
	if (ret < 0) {
	dev_err(chip->dev,
	"Failed to mask A reg: %d\n", ret);
	return ret;
	}

	ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
	if (ret < 0) {
	dev_err(chip->dev,
	"Failed to mask B reg: %d\n", ret);
	return ret;
	}

	ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
	pv88090_irq_handler,
	IRQF_TRIGGER_LOW\|IRQF_ONESHOT,
	"pv88090", chip);
	if (ret != 0) {
	dev_err(chip->dev, "Failed to request IRQ: %d\n",
	i2c->irq);
	return ret;
	}

	ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
	PV88090_M_VDD_FLT \| PV88090_M_OVER_TEMP, 0);
	if (ret < 0) {
	dev_err(chip->dev,
	"Failed to update mask reg: %d\n", ret);
	return ret;
	}

	} else {
	dev_warn(chip->dev, "No IRQ configured\n");
	}

	config.dev = chip->dev;
	config.regmap = chip->regmap;

	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
	if (init_data)
	config.init_data = &init_data[i];

	if (i == PV88090_ID_BUCK2 \|\| i == PV88090_ID_BUCK3) {
	ret = regmap_read(chip->regmap,
	pv88090_regulator_info[i].conf2, &conf2);
	if (ret < 0)
	return ret;

	conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
	PV88090_BUCK_VDAC_RANGE_MASK;

	ret = regmap_read(chip->regmap,
	PV88090_REG_BUCK_FOLD_RANGE, &range);
	if (ret < 0)
	return ret;

	range = (range >>
	(PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
	PV88090_BUCK_VRANGE_GAIN_MASK;
	index = ((range << 1) \| conf2);
	if (index > PV88090_ID_BUCK3) {
	dev_err(chip->dev,
	"Invalid index(%d)\n", index);
	return -EINVAL;
	}

	pv88090_regulator_info[i].desc.min_uV
	= pv88090_buck_vol[index].min_uV;
	pv88090_regulator_info[i].desc.uV_step
	= pv88090_buck_vol[index].uV_step;
	pv88090_regulator_info[i].desc.n_voltages
	= ((pv88090_buck_vol[index].max_uV)
	- (pv88090_buck_vol[index].min_uV))
	/(pv88090_buck_vol[index].uV_step) + 1;
	}

	config.driver_data = (void *)&pv88090_regulator_info[i];
	chip->rdev[i] = devm_regulator_register(chip->dev,
	&pv88090_regulator_info[i].desc, &config);
	if (IS_ERR(chip->rdev[i])) {
	dev_err(chip->dev,
	"Failed to register PV88090 regulator\n");
	return PTR_ERR(chip->rdev[i]);
	}
	}

	return 0;
	}

	static const struct i2c_device_id pv88090_i2c_id[] = {
	{"pv88090", 0},
	{},
	};
	MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);

	#ifdef CONFIG_OF
	static const struct of_device_id pv88090_dt_ids[] = {
	{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
	{},
	};
	MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
	#endif

	static struct i2c_driver pv88090_regulator_driver = {
	.driver = {
	.name = "pv88090",
	.of_match_table = of_match_ptr(pv88090_dt_ids),
	},
	.probe_new = pv88090_i2c_probe,
	.id_table = pv88090_i2c_id,
	};

	module_i2c_driver(pv88090_regulator_driver);

	MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
	MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
	MODULE_LICENSE("GPL");