drivers/regulator/da9211-regulator.c - kernel/common - Git at Google

 /*
  * da9211-regulator.c - Regulator device driver for DA9211/DA9212
  * /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
  * Copyright (C) 2015  Dialog Semiconductor Ltd.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  */

 #include <linux/err.h>
 #include <linux/gpio.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/of_gpio.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/da9211.h>
 #include "da9211-regulator.h"

 /* DEVICE IDs */
 #define DA9211_DEVICE_ID	0x22
 #define DA9213_DEVICE_ID	0x23
 #define DA9215_DEVICE_ID	0x24

 #define DA9211_BUCK_MODE_SLEEP	1
 #define DA9211_BUCK_MODE_SYNC	2
 #define DA9211_BUCK_MODE_AUTO	3

 /* DA9211 REGULATOR IDs */
 #define DA9211_ID_BUCKA	0
 #define DA9211_ID_BUCKB	1

 struct da9211 {
 	struct device *dev;
 	struct regmap *regmap;
 	struct da9211_pdata *pdata;
 	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
 	int num_regulator;
 	int chip_irq;
 	int chip_id;
 };

 static const struct regmap_range_cfg da9211_regmap_range[] = {
 	{
 		.selector_reg = DA9211_REG_PAGE_CON,
 		.selector_mask  = DA9211_REG_PAGE_MASK,
 		.selector_shift = DA9211_REG_PAGE_SHIFT,
 		.window_start = 0,
 		.window_len = 256,
 		.range_min = 0,
 		.range_max = 5*128,
 	},
 };

 static const struct regmap_config da9211_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 5 * 128,
 	.ranges = da9211_regmap_range,
 	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
 };

 /* Default limits measured in millivolts and milliamps */
 #define DA9211_MIN_MV		300
 #define DA9211_MAX_MV		1570
 #define DA9211_STEP_MV		10

 /* Current limits for DA9211 buck (uA) indices
  * corresponds with register values
  */
 static const int da9211_current_limits[] = {
 	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
 	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
 };
 /* Current limits for DA9213 buck (uA) indices
  * corresponds with register values
  */
 static const int da9213_current_limits[] = {
 	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
 	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
 };
 /* Current limits for DA9215 buck (uA) indices
  * corresponds with register values
  */
 static const int da9215_current_limits[] = {
 	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
 	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
 };

 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
 {
 	int id = rdev_get_id(rdev);
 	struct da9211 *chip = rdev_get_drvdata(rdev);
 	unsigned int data;
 	int ret, mode = 0;

 	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
 	if (ret < 0)
 		return ret;

 	switch (data & 0x03) {
 	case DA9211_BUCK_MODE_SYNC:
 		mode = REGULATOR_MODE_FAST;
 		break;
 	case DA9211_BUCK_MODE_AUTO:
 		mode = REGULATOR_MODE_NORMAL;
 		break;
 	case DA9211_BUCK_MODE_SLEEP:
 		mode = REGULATOR_MODE_STANDBY;
 		break;
 	}

 	return mode;
 }

 static int da9211_buck_set_mode(struct regulator_dev *rdev,
 					unsigned int mode)
 {
 	int id = rdev_get_id(rdev);
 	struct da9211 *chip = rdev_get_drvdata(rdev);
 	int val = 0;

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		val = DA9211_BUCK_MODE_SYNC;
 		break;
 	case REGULATOR_MODE_NORMAL:
 		val = DA9211_BUCK_MODE_AUTO;
 		break;
 	case REGULATOR_MODE_STANDBY:
 		val = DA9211_BUCK_MODE_SLEEP;
 		break;
 	}

 	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
 					0x03, val);
 }

 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
 				    int max)
 {
 	int id = rdev_get_id(rdev);
 	struct da9211 *chip = rdev_get_drvdata(rdev);
 	int i, max_size;
 	const int *current_limits;

 	switch (chip->chip_id) {
 	case DA9211:
 		current_limits = da9211_current_limits;
 		max_size = ARRAY_SIZE(da9211_current_limits)-1;
 		break;
 	case DA9213:
 		current_limits = da9213_current_limits;
 		max_size = ARRAY_SIZE(da9213_current_limits)-1;
 		break;
 	case DA9215:
 		current_limits = da9215_current_limits;
 		max_size = ARRAY_SIZE(da9215_current_limits)-1;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* search for closest to maximum */
 	for (i = max_size; i >= 0; i--) {
 		if (min <= current_limits[i] &&
 		    max >= current_limits[i]) {
 				return regmap_update_bits(chip->regmap,
 					DA9211_REG_BUCK_ILIM,
 					(0x0F << id*4), (i << id*4));
 		}
 	}

 	return -EINVAL;
 }

 static int da9211_get_current_limit(struct regulator_dev *rdev)
 {
 	int id = rdev_get_id(rdev);
 	struct da9211 *chip = rdev_get_drvdata(rdev);
 	unsigned int data;
 	int ret;
 	const int *current_limits;

 	switch (chip->chip_id) {
 	case DA9211:
 		current_limits = da9211_current_limits;
 		break;
 	case DA9213:
 		current_limits = da9213_current_limits;
 		break;
 	case DA9215:
 		current_limits = da9215_current_limits;
 		break;
 	default:
 		return -EINVAL;
 	}

 	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
 	if (ret < 0)
 		return ret;

 	/* select one of 16 values: 0000 (2000mA or 3000mA)
 	 * to 1111 (5000mA or 6000mA).
 	 */
 	data = (data >> id*4) & 0x0F;
 	return current_limits[data];
 }

 static const struct regulator_ops da9211_buck_ops = {
 	.get_mode = da9211_buck_get_mode,
 	.set_mode = da9211_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 = da9211_set_current_limit,
 	.get_current_limit = da9211_get_current_limit,
 };

 #define DA9211_BUCK(_id) \
 {\
 	.name = #_id,\
 	.ops = &da9211_buck_ops,\
 	.type = REGULATOR_VOLTAGE,\
 	.id = DA9211_ID_##_id,\
 	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
 	.min_uV = (DA9211_MIN_MV * 1000),\
 	.uV_step = (DA9211_STEP_MV * 1000),\
 	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
 	.enable_mask = DA9211_BUCKA_EN,\
 	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
 	.vsel_mask = DA9211_VBUCK_MASK,\
 	.owner = THIS_MODULE,\
 }

 static struct regulator_desc da9211_regulators[] = {
 	DA9211_BUCK(BUCKA),
 	DA9211_BUCK(BUCKB),
 };

 #ifdef CONFIG_OF
 static struct of_regulator_match da9211_matches[] = {
 	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
 	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
 	};

 static struct da9211_pdata *da9211_parse_regulators_dt(
 		struct device *dev)
 {
 	struct da9211_pdata *pdata;
 	struct device_node *node;
 	int i, num, n;

 	node = of_get_child_by_name(dev->of_node, "regulators");
 	if (!node) {
 		dev_err(dev, "regulators node not found\n");
 		return ERR_PTR(-ENODEV);
 	}

 	num = of_regulator_match(dev, node, da9211_matches,
 				 ARRAY_SIZE(da9211_matches));
 	of_node_put(node);
 	if (num < 0) {
 		dev_err(dev, "Failed to match regulators\n");
 		return ERR_PTR(-EINVAL);
 	}

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);

 	pdata->num_buck = num;

 	n = 0;
 	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
 		if (!da9211_matches[i].init_data)
 			continue;

 		pdata->init_data[n] = da9211_matches[i].init_data;
 		pdata->reg_node[n] = da9211_matches[i].of_node;
 		pdata->gpio_ren[n] =
 			of_get_named_gpio(da9211_matches[i].of_node,
 				"enable-gpios", 0);
 		n++;
 	}

 	return pdata;
 }
 #else
 static struct da9211_pdata *da9211_parse_regulators_dt(
 		struct device *dev)
 {
 	return ERR_PTR(-ENODEV);
 }
 #endif

 static irqreturn_t da9211_irq_handler(int irq, void *data)
 {
 	struct da9211 *chip = data;
 	int reg_val, err, ret = IRQ_NONE;

 	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
 	if (err < 0)
 		goto error_i2c;

 	if (reg_val & DA9211_E_OV_CURR_A) {
 		regulator_notifier_call_chain(chip->rdev[0],
 			REGULATOR_EVENT_OVER_CURRENT, NULL);

 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 			DA9211_E_OV_CURR_A);
 		if (err < 0)
 			goto error_i2c;

 		ret = IRQ_HANDLED;
 	}

 	if (reg_val & DA9211_E_OV_CURR_B) {
 		regulator_notifier_call_chain(chip->rdev[1],
 			REGULATOR_EVENT_OVER_CURRENT, NULL);

 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 			DA9211_E_OV_CURR_B);
 		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;
 }

 static int da9211_regulator_init(struct da9211 *chip)
 {
 	struct regulator_config config = { };
 	int i, ret;
 	unsigned int data;

 	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
 		return ret;
 	}

 	data &= DA9211_SLAVE_SEL;
 	/* If configuration for 1/2 bucks is different between platform data
 	 * and the register, driver should exit.
 	 */
 	if (chip->pdata->num_buck == 1 && data == 0x00)
 		chip->num_regulator = 1;
 	else if (chip->pdata->num_buck == 2 && data != 0x00)
 		chip->num_regulator = 2;
 	else {
 		dev_err(chip->dev, "Configuration is mismatched\n");
 		return -EINVAL;
 	}

 	for (i = 0; i < chip->num_regulator; i++) {
 		config.init_data = chip->pdata->init_data[i];
 		config.dev = chip->dev;
 		config.driver_data = chip;
 		config.regmap = chip->regmap;
 		config.of_node = chip->pdata->reg_node[i];

 		if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
 			config.ena_gpio = chip->pdata->gpio_ren[i];
 			config.ena_gpio_initialized = true;
 		} else {
 			config.ena_gpio = -EINVAL;
 			config.ena_gpio_initialized = false;
 		}

 		chip->rdev[i] = devm_regulator_register(chip->dev,
 			&da9211_regulators[i], &config);
 		if (IS_ERR(chip->rdev[i])) {
 			dev_err(chip->dev,
 				"Failed to register DA9211 regulator\n");
 			return PTR_ERR(chip->rdev[i]);
 		}

 		if (chip->chip_irq != 0) {
 			ret = regmap_update_bits(chip->regmap,
 				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
 			if (ret < 0) {
 				dev_err(chip->dev,
 					"Failed to update mask reg: %d\n", ret);
 				return ret;
 			}
 		}
 	}

 	return 0;
 }

 /*
  * I2C driver interface functions
  */
 static int da9211_i2c_probe(struct i2c_client *i2c,
 		const struct i2c_device_id *id)
 {
 	struct da9211 *chip;
 	int error, ret;
 	unsigned int data;

 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	chip->dev = &i2c->dev;
 	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_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);

 	chip->pdata = i2c->dev.platform_data;

 	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 		return ret;
 	}

 	switch (data) {
 	case DA9211_DEVICE_ID:
 		chip->chip_id = DA9211;
 		break;
 	case DA9213_DEVICE_ID:
 		chip->chip_id = DA9213;
 		break;
 	case DA9215_DEVICE_ID:
 		chip->chip_id = DA9215;
 		break;
 	default:
 		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
 		return -ENODEV;
 	}

 	if (!chip->pdata)
 		chip->pdata = da9211_parse_regulators_dt(chip->dev);

 	if (IS_ERR(chip->pdata)) {
 		dev_err(chip->dev, "No regulators defined for the platform\n");
 		return PTR_ERR(chip->pdata);
 	}

 	chip->chip_irq = i2c->irq;

 	if (chip->chip_irq != 0) {
 		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
 					da9211_irq_handler,
 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 					"da9211", chip);
 		if (ret != 0) {
 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
 				chip->chip_irq);
 			return ret;
 		}
 	} else {
 		dev_warn(chip->dev, "No IRQ configured\n");
 	}

 	ret = da9211_regulator_init(chip);

 	if (ret < 0)
 		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);

 	return ret;
 }

 static const struct i2c_device_id da9211_i2c_id[] = {
 	{"da9211", DA9211},
 	{"da9212", DA9212},
 	{"da9213", DA9213},
 	{"da9223", DA9223},
 	{"da9214", DA9214},
 	{"da9224", DA9224},
 	{"da9215", DA9215},
 	{"da9225", DA9225},
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);

 #ifdef CONFIG_OF
 static const struct of_device_id da9211_dt_ids[] = {
 	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
 	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
 	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
 	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
 	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
 	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
 	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
 	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
 	{},
 };
 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
 #endif

 static struct i2c_driver da9211_regulator_driver = {
 	.driver = {
 		.name = "da9211",
 		.of_match_table = of_match_ptr(da9211_dt_ids),
 	},
 	.probe = da9211_i2c_probe,
 	.id_table = da9211_i2c_id,
 };

 module_i2c_driver(da9211_regulator_driver);

 MODULE_AUTHOR("James Ban <[email protected]>");
 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
 MODULE_LICENSE("GPL");
	/*
	* da9211-regulator.c - Regulator device driver for DA9211/DA9212
	* /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
	* Copyright (C) 2015 Dialog Semiconductor Ltd.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*/

	#include <linux/err.h>
	#include <linux/gpio.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/of_gpio.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regulator/da9211.h>
	#include "da9211-regulator.h"

	/* DEVICE IDs */
	#define DA9211_DEVICE_ID 0x22
	#define DA9213_DEVICE_ID 0x23
	#define DA9215_DEVICE_ID 0x24

	#define DA9211_BUCK_MODE_SLEEP 1
	#define DA9211_BUCK_MODE_SYNC 2
	#define DA9211_BUCK_MODE_AUTO 3

	/* DA9211 REGULATOR IDs */
	#define DA9211_ID_BUCKA 0
	#define DA9211_ID_BUCKB 1

	struct da9211 {
	struct device *dev;
	struct regmap *regmap;
	struct da9211_pdata *pdata;
	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
	int num_regulator;
	int chip_irq;
	int chip_id;
	};

	static const struct regmap_range_cfg da9211_regmap_range[] = {
	{
	.selector_reg = DA9211_REG_PAGE_CON,
	.selector_mask = DA9211_REG_PAGE_MASK,
	.selector_shift = DA9211_REG_PAGE_SHIFT,
	.window_start = 0,
	.window_len = 256,
	.range_min = 0,
	.range_max = 5*128,
	},
	};

	static const struct regmap_config da9211_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 5 * 128,
	.ranges = da9211_regmap_range,
	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
	};

	/* Default limits measured in millivolts and milliamps */
	#define DA9211_MIN_MV 300
	#define DA9211_MAX_MV 1570
	#define DA9211_STEP_MV 10

	/* Current limits for DA9211 buck (uA) indices
	* corresponds with register values
	*/
	static const int da9211_current_limits[] = {
	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
	};
	/* Current limits for DA9213 buck (uA) indices
	* corresponds with register values
	*/
	static const int da9213_current_limits[] = {
	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
	};
	/* Current limits for DA9215 buck (uA) indices
	* corresponds with register values
	*/
	static const int da9215_current_limits[] = {
	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
	};

	static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
	{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret, mode = 0;

	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
	if (ret < 0)
	return ret;

	switch (data & 0x03) {
	case DA9211_BUCK_MODE_SYNC:
	mode = REGULATOR_MODE_FAST;
	break;
	case DA9211_BUCK_MODE_AUTO:
	mode = REGULATOR_MODE_NORMAL;
	break;
	case DA9211_BUCK_MODE_SLEEP:
	mode = REGULATOR_MODE_STANDBY;
	break;
	}

	return mode;
	}

	static int da9211_buck_set_mode(struct regulator_dev *rdev,
	unsigned int mode)
	{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
	val = DA9211_BUCK_MODE_SYNC;
	break;
	case REGULATOR_MODE_NORMAL:
	val = DA9211_BUCK_MODE_AUTO;
	break;
	case REGULATOR_MODE_STANDBY:
	val = DA9211_BUCK_MODE_SLEEP;
	break;
	}

	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
	0x03, val);
	}

	static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
	int max)
	{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int i, max_size;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
	current_limits = da9211_current_limits;
	max_size = ARRAY_SIZE(da9211_current_limits)-1;
	break;
	case DA9213:
	current_limits = da9213_current_limits;
	max_size = ARRAY_SIZE(da9213_current_limits)-1;
	break;
	case DA9215:
	current_limits = da9215_current_limits;
	max_size = ARRAY_SIZE(da9215_current_limits)-1;
	break;
	default:
	return -EINVAL;
	}

	/* search for closest to maximum */
	for (i = max_size; i >= 0; i--) {
	if (min <= current_limits[i] &&
	max >= current_limits[i]) {
	return regmap_update_bits(chip->regmap,
	DA9211_REG_BUCK_ILIM,
	(0x0F << id4), (i << id4));
	}
	}

	return -EINVAL;
	}

	static int da9211_get_current_limit(struct regulator_dev *rdev)
	{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
	current_limits = da9211_current_limits;
	break;
	case DA9213:
	current_limits = da9213_current_limits;
	break;
	case DA9215:
	current_limits = da9215_current_limits;
	break;
	default:
	return -EINVAL;
	}

	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
	if (ret < 0)
	return ret;

	/* select one of 16 values: 0000 (2000mA or 3000mA)
	* to 1111 (5000mA or 6000mA).
	*/
	data = (data >> id*4) & 0x0F;
	return current_limits[data];
	}

	static const struct regulator_ops da9211_buck_ops = {
	.get_mode = da9211_buck_get_mode,
	.set_mode = da9211_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 = da9211_set_current_limit,
	.get_current_limit = da9211_get_current_limit,
	};

	#define DA9211_BUCK(_id) \
	{\
	.name = #_id,\
	.ops = &da9211_buck_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9211_ID_##_id,\
	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
	.min_uV = (DA9211_MIN_MV * 1000),\
	.uV_step = (DA9211_STEP_MV * 1000),\
	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
	.enable_mask = DA9211_BUCKA_EN,\
	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
	.vsel_mask = DA9211_VBUCK_MASK,\
	.owner = THIS_MODULE,\
	}

	static struct regulator_desc da9211_regulators[] = {
	DA9211_BUCK(BUCKA),
	DA9211_BUCK(BUCKB),
	};

	#ifdef CONFIG_OF
	static struct of_regulator_match da9211_matches[] = {
	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
	};

	static struct da9211_pdata *da9211_parse_regulators_dt(
	struct device *dev)
	{
	struct da9211_pdata *pdata;
	struct device_node *node;
	int i, num, n;

	node = of_get_child_by_name(dev->of_node, "regulators");
	if (!node) {
	dev_err(dev, "regulators node not found\n");
	return ERR_PTR(-ENODEV);
	}

	num = of_regulator_match(dev, node, da9211_matches,
	ARRAY_SIZE(da9211_matches));
	of_node_put(node);
	if (num < 0) {
	dev_err(dev, "Failed to match regulators\n");
	return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return ERR_PTR(-ENOMEM);

	pdata->num_buck = num;

	n = 0;
	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
	if (!da9211_matches[i].init_data)
	continue;

	pdata->init_data[n] = da9211_matches[i].init_data;
	pdata->reg_node[n] = da9211_matches[i].of_node;
	pdata->gpio_ren[n] =
	of_get_named_gpio(da9211_matches[i].of_node,
	"enable-gpios", 0);
	n++;
	}

	return pdata;
	}
	#else
	static struct da9211_pdata *da9211_parse_regulators_dt(
	struct device *dev)
	{
	return ERR_PTR(-ENODEV);
	}
	#endif

	static irqreturn_t da9211_irq_handler(int irq, void *data)
	{
	struct da9211 *chip = data;
	int reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
	if (err < 0)
	goto error_i2c;

	if (reg_val & DA9211_E_OV_CURR_A) {
	regulator_notifier_call_chain(chip->rdev[0],
	REGULATOR_EVENT_OVER_CURRENT, NULL);

	err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
	DA9211_E_OV_CURR_A);
	if (err < 0)
	goto error_i2c;

	ret = IRQ_HANDLED;
	}

	if (reg_val & DA9211_E_OV_CURR_B) {
	regulator_notifier_call_chain(chip->rdev[1],
	REGULATOR_EVENT_OVER_CURRENT, NULL);

	err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
	DA9211_E_OV_CURR_B);
	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;
	}

	static int da9211_regulator_init(struct da9211 *chip)
	{
	struct regulator_config config = { };
	int i, ret;
	unsigned int data;

	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
	return ret;
	}

	data &= DA9211_SLAVE_SEL;
	/* If configuration for 1/2 bucks is different between platform data
	* and the register, driver should exit.
	*/
	if (chip->pdata->num_buck == 1 && data == 0x00)
	chip->num_regulator = 1;
	else if (chip->pdata->num_buck == 2 && data != 0x00)
	chip->num_regulator = 2;
	else {
	dev_err(chip->dev, "Configuration is mismatched\n");
	return -EINVAL;
	}

	for (i = 0; i < chip->num_regulator; i++) {
	config.init_data = chip->pdata->init_data[i];
	config.dev = chip->dev;
	config.driver_data = chip;
	config.regmap = chip->regmap;
	config.of_node = chip->pdata->reg_node[i];

	if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
	config.ena_gpio = chip->pdata->gpio_ren[i];
	config.ena_gpio_initialized = true;
	} else {
	config.ena_gpio = -EINVAL;
	config.ena_gpio_initialized = false;
	}

	chip->rdev[i] = devm_regulator_register(chip->dev,
	&da9211_regulators[i], &config);
	if (IS_ERR(chip->rdev[i])) {
	dev_err(chip->dev,
	"Failed to register DA9211 regulator\n");
	return PTR_ERR(chip->rdev[i]);
	}

	if (chip->chip_irq != 0) {
	ret = regmap_update_bits(chip->regmap,
	DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
	if (ret < 0) {
	dev_err(chip->dev,
	"Failed to update mask reg: %d\n", ret);
	return ret;
	}
	}
	}

	return 0;
	}

	/*
	* I2C driver interface functions
	*/
	static int da9211_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct da9211 *chip;
	int error, ret;
	unsigned int data;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	chip->dev = &i2c->dev;
	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_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);

	chip->pdata = i2c->dev.platform_data;

	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
	return ret;
	}

	switch (data) {
	case DA9211_DEVICE_ID:
	chip->chip_id = DA9211;
	break;
	case DA9213_DEVICE_ID:
	chip->chip_id = DA9213;
	break;
	case DA9215_DEVICE_ID:
	chip->chip_id = DA9215;
	break;
	default:
	dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
	return -ENODEV;
	}

	if (!chip->pdata)
	chip->pdata = da9211_parse_regulators_dt(chip->dev);

	if (IS_ERR(chip->pdata)) {
	dev_err(chip->dev, "No regulators defined for the platform\n");
	return PTR_ERR(chip->pdata);
	}

	chip->chip_irq = i2c->irq;

	if (chip->chip_irq != 0) {
	ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
	da9211_irq_handler,
	IRQF_TRIGGER_LOW\|IRQF_ONESHOT,
	"da9211", chip);
	if (ret != 0) {
	dev_err(chip->dev, "Failed to request IRQ: %d\n",
	chip->chip_irq);
	return ret;
	}
	} else {
	dev_warn(chip->dev, "No IRQ configured\n");
	}

	ret = da9211_regulator_init(chip);

	if (ret < 0)
	dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);

	return ret;
	}

	static const struct i2c_device_id da9211_i2c_id[] = {
	{"da9211", DA9211},
	{"da9212", DA9212},
	{"da9213", DA9213},
	{"da9223", DA9223},
	{"da9214", DA9214},
	{"da9224", DA9224},
	{"da9215", DA9215},
	{"da9225", DA9225},
	{},
	};
	MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);

	#ifdef CONFIG_OF
	static const struct of_device_id da9211_dt_ids[] = {
	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
	{},
	};
	MODULE_DEVICE_TABLE(of, da9211_dt_ids);
	#endif

	static struct i2c_driver da9211_regulator_driver = {
	.driver = {
	.name = "da9211",
	.of_match_table = of_match_ptr(da9211_dt_ids),
	},
	.probe = da9211_i2c_probe,
	.id_table = da9211_i2c_id,
	};

	module_i2c_driver(da9211_regulator_driver);

	MODULE_AUTHOR("James Ban <[email protected]>");
	MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
	MODULE_LICENSE("GPL");