drivers/regulator/da9052-regulator.c - linux/kernel/git/viro/vfs - Git at Google

 /*
 * da9052-regulator.c: Regulator driver for DA9052
 *
 * Copyright(c) 2011 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #ifdef CONFIG_OF
 #include <linux/of.h>
 #include <linux/regulator/of_regulator.h>
 #endif

 #include <linux/mfd/da9052/da9052.h>
 #include <linux/mfd/da9052/reg.h>
 #include <linux/mfd/da9052/pdata.h>

 /* Buck step size */
 #define DA9052_BUCK_PERI_3uV_STEP		100000
 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV	24
 #define DA9052_CONST_3uV			3000000

 #define DA9052_MIN_UA		0
 #define DA9052_MAX_UA		3
 #define DA9052_CURRENT_RANGE	4

 /* Bit masks */
 #define DA9052_BUCK_ILIM_MASK_EVEN	0x0c
 #define DA9052_BUCK_ILIM_MASK_ODD	0xc0

 /* DA9052 REGULATOR IDs */
 #define DA9052_ID_BUCK1		0
 #define DA9052_ID_BUCK2		1
 #define DA9052_ID_BUCK3		2
 #define DA9052_ID_BUCK4		3
 #define DA9052_ID_LDO1		4
 #define DA9052_ID_LDO2		5
 #define DA9052_ID_LDO3		6
 #define DA9052_ID_LDO4		7
 #define DA9052_ID_LDO5		8
 #define DA9052_ID_LDO6		9
 #define DA9052_ID_LDO7		10
 #define DA9052_ID_LDO8		11
 #define DA9052_ID_LDO9		12
 #define DA9052_ID_LDO10		13

 static const u32 da9052_current_limits[3][4] = {
 	{700000, 800000, 1000000, 1200000},	/* DA9052-BC BUCKs */
 	{1600000, 2000000, 2400000, 3000000},	/* DA9053-AA/Bx BUCK-CORE */
 	{800000, 1000000, 1200000, 1500000},	/* DA9053-AA/Bx BUCK-PRO,
 						 * BUCK-MEM and BUCK-PERI
 						*/
 };

 struct da9052_regulator_info {
 	struct regulator_desc reg_desc;
 	int step_uV;
 	int min_uV;
 	int max_uV;
 	unsigned char activate_bit;
 };

 struct da9052_regulator {
 	struct da9052 *da9052;
 	struct da9052_regulator_info *info;
 	struct regulator_dev *rdev;
 };

 static int verify_range(struct da9052_regulator_info *info,
 			 int min_uV, int max_uV)
 {
 	if (min_uV > info->max_uV || max_uV < info->min_uV)
 		return -EINVAL;

 	return 0;
 }

 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
 {
 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 	int offset = rdev_get_id(rdev);
 	int ret, row = 2;

 	ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
 	if (ret < 0)
 		return ret;

 	/* Determine the even or odd position of the buck current limit
 	 * register field
 	*/
 	if (offset % 2 == 0)
 		ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
 	else
 		ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;

 	/* Select the appropriate current limit range */
 	if (regulator->da9052->chip_id == DA9052)
 		row = 0;
 	else if (offset == 0)
 		row = 1;

 	return da9052_current_limits[row][ret];
 }

 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
 					  int max_uA)
 {
 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 	int offset = rdev_get_id(rdev);
 	int reg_val = 0;
 	int i, row = 2;

 	/* Select the appropriate current limit range */
 	if (regulator->da9052->chip_id == DA9052)
 		row = 0;
 	else if (offset == 0)
 		row = 1;

 	for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
 		if ((min_uA <= da9052_current_limits[row][i]) &&
 		    (da9052_current_limits[row][i] <= max_uA)) {
 			reg_val = i;
 			break;
 		}
 	}

 	if (i < 0)
 		return -EINVAL;

 	/* Determine the even or odd position of the buck current limit
 	 * register field
 	*/
 	if (offset % 2 == 0)
 		return da9052_reg_update(regulator->da9052,
 					 DA9052_BUCKA_REG + offset/2,
 					 DA9052_BUCK_ILIM_MASK_EVEN,
 					 reg_val << 2);
 	else
 		return da9052_reg_update(regulator->da9052,
 					 DA9052_BUCKA_REG + offset/2,
 					 DA9052_BUCK_ILIM_MASK_ODD,
 					 reg_val << 6);
 }

 static int da9052_list_voltage(struct regulator_dev *rdev,
 				unsigned int selector)
 {
 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9052_regulator_info *info = regulator->info;
 	int id = rdev_get_id(rdev);
 	int volt_uV;

 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 		&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
 		volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
 			  + info->min_uV);
 		volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
 				    * (DA9052_BUCK_PERI_3uV_STEP);
 	} else {
 		volt_uV = (selector * info->step_uV) + info->min_uV;
 	}

 	if (volt_uV > info->max_uV)
 		return -EINVAL;

 	return volt_uV;
 }

 static int da9052_map_voltage(struct regulator_dev *rdev,
 			      int min_uV, int max_uV)
 {
 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9052_regulator_info *info = regulator->info;
 	int id = rdev_get_id(rdev);
 	int ret, sel;

 	ret = verify_range(info, min_uV, max_uV);
 	if (ret < 0)
 		return ret;

 	if (min_uV < info->min_uV)
 		min_uV = info->min_uV;

 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 		&& (min_uV >= DA9052_CONST_3uV)) {
 			sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
 			      DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
 					   DA9052_BUCK_PERI_3uV_STEP);
 	} else {
 		sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
 	}

 	ret = da9052_list_voltage(rdev, sel);
 	if (ret < 0)
 		return ret;

 	return sel;
 }

 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
 					    unsigned int selector)
 {
 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 	struct da9052_regulator_info *info = regulator->info;
 	int id = rdev_get_id(rdev);
 	int ret;

 	ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
 				rdev->desc->vsel_mask, selector);
 	if (ret < 0)
 		return ret;

 	/* Some LDOs and DCDCs are DVC controlled which requires enabling of
 	 * the activate bit to implment the changes on the output.
 	 */
 	switch (id) {
 	case DA9052_ID_BUCK1:
 	case DA9052_ID_BUCK2:
 	case DA9052_ID_BUCK3:
 	case DA9052_ID_LDO2:
 	case DA9052_ID_LDO3:
 		ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
 					info->activate_bit, info->activate_bit);
 		break;
 	}

 	return ret;
 }

 static struct regulator_ops da9052_dcdc_ops = {
 	.get_current_limit = da9052_dcdc_get_current_limit,
 	.set_current_limit = da9052_dcdc_set_current_limit,

 	.list_voltage = da9052_list_voltage,
 	.map_voltage = da9052_map_voltage,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 };

 static struct regulator_ops da9052_ldo_ops = {
 	.list_voltage = da9052_list_voltage,
 	.map_voltage = da9052_map_voltage,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 };

 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
 {\
 	.reg_desc = {\
 		.name = #_id,\
 		.ops = &da9052_ldo_ops,\
 		.type = REGULATOR_VOLTAGE,\
 		.id = DA9052_ID_##_id,\
 		.n_voltages = (max - min) / step + 1, \
 		.owner = THIS_MODULE,\
 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 		.vsel_mask = (1 << (sbits)) - 1,\
 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 		.enable_mask = 1 << (ebits),\
 	},\
 	.min_uV = (min) * 1000,\
 	.max_uV = (max) * 1000,\
 	.step_uV = (step) * 1000,\
 	.activate_bit = (abits),\
 }

 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
 {\
 	.reg_desc = {\
 		.name = #_id,\
 		.ops = &da9052_dcdc_ops,\
 		.type = REGULATOR_VOLTAGE,\
 		.id = DA9052_ID_##_id,\
 		.n_voltages = (max - min) / step + 1, \
 		.owner = THIS_MODULE,\
 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 		.vsel_mask = (1 << (sbits)) - 1,\
 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 		.enable_mask = 1 << (ebits),\
 	},\
 	.min_uV = (min) * 1000,\
 	.max_uV = (max) * 1000,\
 	.step_uV = (step) * 1000,\
 	.activate_bit = (abits),\
 }

 static struct da9052_regulator_info da9052_regulator_info[] = {
 	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 	DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
 	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 };

 static struct da9052_regulator_info da9053_regulator_info[] = {
 	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 	DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
 	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 };

 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
 								 int id)
 {
 	struct da9052_regulator_info *info;
 	int i;

 	switch (chip_id) {
 	case DA9052:
 		for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
 			info = &da9052_regulator_info[i];
 			if (info->reg_desc.id == id)
 				return info;
 		}
 		break;
 	case DA9053_AA:
 	case DA9053_BA:
 	case DA9053_BB:
 		for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
 			info = &da9053_regulator_info[i];
 			if (info->reg_desc.id == id)
 				return info;
 		}
 		break;
 	}

 	return NULL;
 }

 static int da9052_regulator_probe(struct platform_device *pdev)
 {
 	struct regulator_config config = { };
 	struct da9052_regulator *regulator;
 	struct da9052 *da9052;
 	struct da9052_pdata *pdata;

 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
 				 GFP_KERNEL);
 	if (!regulator)
 		return -ENOMEM;

 	da9052 = dev_get_drvdata(pdev->dev.parent);
 	pdata = dev_get_platdata(da9052->dev);
 	regulator->da9052 = da9052;

 	regulator->info = find_regulator_info(regulator->da9052->chip_id,
 					      pdev->id);
 	if (regulator->info == NULL) {
 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
 		return -EINVAL;
 	}

 	config.dev = &pdev->dev;
 	config.driver_data = regulator;
 	config.regmap = da9052->regmap;
 	if (pdata && pdata->regulators) {
 		config.init_data = pdata->regulators[pdev->id];
 	} else {
 #ifdef CONFIG_OF
 		struct device_node *nproot, *np;

 		nproot = of_node_get(da9052->dev->of_node);
 		if (!nproot)
 			return -ENODEV;

 		nproot = of_find_node_by_name(nproot, "regulators");
 		if (!nproot)
 			return -ENODEV;

 		for_each_child_of_node(nproot, np) {
 			if (!of_node_cmp(np->name,
 					 regulator->info->reg_desc.name)) {
 				config.init_data = of_get_regulator_init_data(
 					&pdev->dev, np);
 				config.of_node = np;
 				break;
 			}
 		}
 		of_node_put(nproot);
 #endif
 	}

 	regulator->rdev = devm_regulator_register(&pdev->dev,
 						  &regulator->info->reg_desc,
 						  &config);
 	if (IS_ERR(regulator->rdev)) {
 		dev_err(&pdev->dev, "failed to register regulator %s\n",
 			regulator->info->reg_desc.name);
 		return PTR_ERR(regulator->rdev);
 	}

 	platform_set_drvdata(pdev, regulator);

 	return 0;
 }

 static struct platform_driver da9052_regulator_driver = {
 	.probe = da9052_regulator_probe,
 	.driver = {
 		.name = "da9052-regulator",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init da9052_regulator_init(void)
 {
 	return platform_driver_register(&da9052_regulator_driver);
 }
 subsys_initcall(da9052_regulator_init);

 static void __exit da9052_regulator_exit(void)
 {
 	platform_driver_unregister(&da9052_regulator_driver);
 }
 module_exit(da9052_regulator_exit);

 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:da9052-regulator");
	/*
	* da9052-regulator.c: Regulator driver for DA9052
	*
	* Copyright(c) 2011 Dialog Semiconductor Ltd.
	*
	* Author: David Dajun Chen <dchen@diasemi.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#ifdef CONFIG_OF
	#include <linux/of.h>
	#include <linux/regulator/of_regulator.h>
	#endif

	#include <linux/mfd/da9052/da9052.h>
	#include <linux/mfd/da9052/reg.h>
	#include <linux/mfd/da9052/pdata.h>

	/* Buck step size */
	#define DA9052_BUCK_PERI_3uV_STEP 100000
	#define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV 24
	#define DA9052_CONST_3uV 3000000

	#define DA9052_MIN_UA 0
	#define DA9052_MAX_UA 3
	#define DA9052_CURRENT_RANGE 4

	/* Bit masks */
	#define DA9052_BUCK_ILIM_MASK_EVEN 0x0c
	#define DA9052_BUCK_ILIM_MASK_ODD 0xc0

	/* DA9052 REGULATOR IDs */
	#define DA9052_ID_BUCK1 0
	#define DA9052_ID_BUCK2 1
	#define DA9052_ID_BUCK3 2
	#define DA9052_ID_BUCK4 3
	#define DA9052_ID_LDO1 4
	#define DA9052_ID_LDO2 5
	#define DA9052_ID_LDO3 6
	#define DA9052_ID_LDO4 7
	#define DA9052_ID_LDO5 8
	#define DA9052_ID_LDO6 9
	#define DA9052_ID_LDO7 10
	#define DA9052_ID_LDO8 11
	#define DA9052_ID_LDO9 12
	#define DA9052_ID_LDO10 13

	static const u32 da9052_current_limits[3][4] = {
	{700000, 800000, 1000000, 1200000}, /* DA9052-BC BUCKs */
	{1600000, 2000000, 2400000, 3000000}, /* DA9053-AA/Bx BUCK-CORE */
	{800000, 1000000, 1200000, 1500000}, /* DA9053-AA/Bx BUCK-PRO,
	* BUCK-MEM and BUCK-PERI
	*/
	};

	struct da9052_regulator_info {
	struct regulator_desc reg_desc;
	int step_uV;
	int min_uV;
	int max_uV;
	unsigned char activate_bit;
	};

	struct da9052_regulator {
	struct da9052 *da9052;
	struct da9052_regulator_info *info;
	struct regulator_dev *rdev;
	};

	static int verify_range(struct da9052_regulator_info *info,
	int min_uV, int max_uV)
	{
	if (min_uV > info->max_uV \|\| max_uV < info->min_uV)
	return -EINVAL;

	return 0;
	}

	static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
	{
	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
	int offset = rdev_get_id(rdev);
	int ret, row = 2;

	ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
	if (ret < 0)
	return ret;

	/* Determine the even or odd position of the buck current limit
	* register field
	*/
	if (offset % 2 == 0)
	ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
	else
	ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;

	/* Select the appropriate current limit range */
	if (regulator->da9052->chip_id == DA9052)
	row = 0;
	else if (offset == 0)
	row = 1;

	return da9052_current_limits[row][ret];
	}

	static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
	int max_uA)
	{
	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
	int offset = rdev_get_id(rdev);
	int reg_val = 0;
	int i, row = 2;

	/* Select the appropriate current limit range */
	if (regulator->da9052->chip_id == DA9052)
	row = 0;
	else if (offset == 0)
	row = 1;

	for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
	if ((min_uA <= da9052_current_limits[row][i]) &&
	(da9052_current_limits[row][i] <= max_uA)) {
	reg_val = i;
	break;
	}
	}

	if (i < 0)
	return -EINVAL;

	/* Determine the even or odd position of the buck current limit
	* register field
	*/
	if (offset % 2 == 0)
	return da9052_reg_update(regulator->da9052,
	DA9052_BUCKA_REG + offset/2,
	DA9052_BUCK_ILIM_MASK_EVEN,
	reg_val << 2);
	else
	return da9052_reg_update(regulator->da9052,
	DA9052_BUCKA_REG + offset/2,
	DA9052_BUCK_ILIM_MASK_ODD,
	reg_val << 6);
	}

	static int da9052_list_voltage(struct regulator_dev *rdev,
	unsigned int selector)
	{
	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9052_regulator_info *info = regulator->info;
	int id = rdev_get_id(rdev);
	int volt_uV;

	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
	&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
	volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
	+ info->min_uV);
	volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
	* (DA9052_BUCK_PERI_3uV_STEP);
	} else {
	volt_uV = (selector * info->step_uV) + info->min_uV;
	}

	if (volt_uV > info->max_uV)
	return -EINVAL;

	return volt_uV;
	}

	static int da9052_map_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV)
	{
	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9052_regulator_info *info = regulator->info;
	int id = rdev_get_id(rdev);
	int ret, sel;

	ret = verify_range(info, min_uV, max_uV);
	if (ret < 0)
	return ret;

	if (min_uV < info->min_uV)
	min_uV = info->min_uV;

	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
	&& (min_uV >= DA9052_CONST_3uV)) {
	sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
	DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
	DA9052_BUCK_PERI_3uV_STEP);
	} else {
	sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
	}

	ret = da9052_list_voltage(rdev, sel);
	if (ret < 0)
	return ret;

	return sel;
	}

	static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
	unsigned int selector)
	{
	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
	struct da9052_regulator_info *info = regulator->info;
	int id = rdev_get_id(rdev);
	int ret;

	ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
	rdev->desc->vsel_mask, selector);
	if (ret < 0)
	return ret;

	/* Some LDOs and DCDCs are DVC controlled which requires enabling of
	* the activate bit to implment the changes on the output.
	*/
	switch (id) {
	case DA9052_ID_BUCK1:
	case DA9052_ID_BUCK2:
	case DA9052_ID_BUCK3:
	case DA9052_ID_LDO2:
	case DA9052_ID_LDO3:
	ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
	info->activate_bit, info->activate_bit);
	break;
	}

	return ret;
	}

	static struct regulator_ops da9052_dcdc_ops = {
	.get_current_limit = da9052_dcdc_get_current_limit,
	.set_current_limit = da9052_dcdc_set_current_limit,

	.list_voltage = da9052_list_voltage,
	.map_voltage = da9052_map_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = da9052_regulator_set_voltage_sel,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	};

	static struct regulator_ops da9052_ldo_ops = {
	.list_voltage = da9052_list_voltage,
	.map_voltage = da9052_map_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = da9052_regulator_set_voltage_sel,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	};

	#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
	{\
	.reg_desc = {\
	.name = #_id,\
	.ops = &da9052_ldo_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9052_ID_##_id,\
	.n_voltages = (max - min) / step + 1, \
	.owner = THIS_MODULE,\
	.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
	.vsel_mask = (1 << (sbits)) - 1,\
	.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
	.enable_mask = 1 << (ebits),\
	},\
	.min_uV = (min) * 1000,\
	.max_uV = (max) * 1000,\
	.step_uV = (step) * 1000,\
	.activate_bit = (abits),\
	}

	#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
	{\
	.reg_desc = {\
	.name = #_id,\
	.ops = &da9052_dcdc_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9052_ID_##_id,\
	.n_voltages = (max - min) / step + 1, \
	.owner = THIS_MODULE,\
	.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
	.vsel_mask = (1 << (sbits)) - 1,\
	.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
	.enable_mask = 1 << (ebits),\
	},\
	.min_uV = (min) * 1000,\
	.max_uV = (max) * 1000,\
	.step_uV = (step) * 1000,\
	.activate_bit = (abits),\
	}

	static struct da9052_regulator_info da9052_regulator_info[] = {
	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
	DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
	};

	static struct da9052_regulator_info da9053_regulator_info[] = {
	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
	DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
	};

	static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
	int id)
	{
	struct da9052_regulator_info *info;
	int i;

	switch (chip_id) {
	case DA9052:
	for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
	info = &da9052_regulator_info[i];
	if (info->reg_desc.id == id)
	return info;
	}
	break;
	case DA9053_AA:
	case DA9053_BA:
	case DA9053_BB:
	for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
	info = &da9053_regulator_info[i];
	if (info->reg_desc.id == id)
	return info;
	}
	break;
	}

	return NULL;
	}

	static int da9052_regulator_probe(struct platform_device *pdev)
	{
	struct regulator_config config = { };
	struct da9052_regulator *regulator;
	struct da9052 *da9052;
	struct da9052_pdata *pdata;

	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
	GFP_KERNEL);
	if (!regulator)
	return -ENOMEM;

	da9052 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(da9052->dev);
	regulator->da9052 = da9052;

	regulator->info = find_regulator_info(regulator->da9052->chip_id,
	pdev->id);
	if (regulator->info == NULL) {
	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	return -EINVAL;
	}

	config.dev = &pdev->dev;
	config.driver_data = regulator;
	config.regmap = da9052->regmap;
	if (pdata && pdata->regulators) {
	config.init_data = pdata->regulators[pdev->id];
	} else {
	#ifdef CONFIG_OF
	struct device_node nproot, np;

	nproot = of_node_get(da9052->dev->of_node);
	if (!nproot)
	return -ENODEV;

	nproot = of_find_node_by_name(nproot, "regulators");
	if (!nproot)
	return -ENODEV;

	for_each_child_of_node(nproot, np) {
	if (!of_node_cmp(np->name,
	regulator->info->reg_desc.name)) {
	config.init_data = of_get_regulator_init_data(
	&pdev->dev, np);
	config.of_node = np;
	break;
	}
	}
	of_node_put(nproot);
	#endif
	}

	regulator->rdev = devm_regulator_register(&pdev->dev,
	&regulator->info->reg_desc,
	&config);
	if (IS_ERR(regulator->rdev)) {
	dev_err(&pdev->dev, "failed to register regulator %s\n",
	regulator->info->reg_desc.name);
	return PTR_ERR(regulator->rdev);
	}

	platform_set_drvdata(pdev, regulator);

	return 0;
	}

	static struct platform_driver da9052_regulator_driver = {
	.probe = da9052_regulator_probe,
	.driver = {
	.name = "da9052-regulator",
	.owner = THIS_MODULE,
	},
	};

	static int __init da9052_regulator_init(void)
	{
	return platform_driver_register(&da9052_regulator_driver);
	}
	subsys_initcall(da9052_regulator_init);

	static void __exit da9052_regulator_exit(void)
	{
	platform_driver_unregister(&da9052_regulator_driver);
	}
	module_exit(da9052_regulator_exit);

	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:da9052-regulator");