drivers/regulator/tps6507x-regulator.c - linux/kernel/git/davem/net - Git at Google

 /*
  * tps6507x-regulator.c
  *
  * Regulator driver for TPS65073 PMIC
  *
  * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  * whether express or implied; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/tps6507x.h>
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/mfd/tps6507x.h>
 #include <linux/regulator/of_regulator.h>

 /* DCDC's */
 #define TPS6507X_DCDC_1				0
 #define TPS6507X_DCDC_2				1
 #define TPS6507X_DCDC_3				2
 /* LDOs */
 #define TPS6507X_LDO_1				3
 #define TPS6507X_LDO_2				4

 #define TPS6507X_MAX_REG_ID			TPS6507X_LDO_2

 /* Number of step-down converters available */
 #define TPS6507X_NUM_DCDC			3
 /* Number of LDO voltage regulators  available */
 #define TPS6507X_NUM_LDO			2
 /* Number of total regulators available */
 #define TPS6507X_NUM_REGULATOR		(TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)

 /* Supported voltage values for regulators (in microVolts) */
 static const unsigned int VDCDCx_VSEL_table[] = {
 	725000, 750000, 775000, 800000,
 	825000, 850000, 875000, 900000,
 	925000, 950000, 975000, 1000000,
 	1025000, 1050000, 1075000, 1100000,
 	1125000, 1150000, 1175000, 1200000,
 	1225000, 1250000, 1275000, 1300000,
 	1325000, 1350000, 1375000, 1400000,
 	1425000, 1450000, 1475000, 1500000,
 	1550000, 1600000, 1650000, 1700000,
 	1750000, 1800000, 1850000, 1900000,
 	1950000, 2000000, 2050000, 2100000,
 	2150000, 2200000, 2250000, 2300000,
 	2350000, 2400000, 2450000, 2500000,
 	2550000, 2600000, 2650000, 2700000,
 	2750000, 2800000, 2850000, 2900000,
 	3000000, 3100000, 3200000, 3300000,
 };

 static const unsigned int LDO1_VSEL_table[] = {
 	1000000, 1100000, 1200000, 1250000,
 	1300000, 1350000, 1400000, 1500000,
 	1600000, 1800000, 2500000, 2750000,
 	2800000, 3000000, 3100000, 3300000,
 };

 /* The voltage mapping table for LDO2 is the same as VDCDCx */
 #define LDO2_VSEL_table VDCDCx_VSEL_table

 struct tps_info {
 	const char *name;
 	u8 table_len;
 	const unsigned int *table;

 	/* Does DCDC high or the low register defines output voltage? */
 	bool defdcdc_default;
 };

 static struct tps_info tps6507x_pmic_regs[] = {
 	{
 		.name = "VDCDC1",
 		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 		.table = VDCDCx_VSEL_table,
 	},
 	{
 		.name = "VDCDC2",
 		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 		.table = VDCDCx_VSEL_table,
 	},
 	{
 		.name = "VDCDC3",
 		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 		.table = VDCDCx_VSEL_table,
 	},
 	{
 		.name = "LDO1",
 		.table_len = ARRAY_SIZE(LDO1_VSEL_table),
 		.table = LDO1_VSEL_table,
 	},
 	{
 		.name = "LDO2",
 		.table_len = ARRAY_SIZE(LDO2_VSEL_table),
 		.table = LDO2_VSEL_table,
 	},
 };

 struct tps6507x_pmic {
 	struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
 	struct tps6507x_dev *mfd;
 	struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
 	struct tps_info *info[TPS6507X_NUM_REGULATOR];
 	struct mutex io_lock;
 };
 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
 {
 	u8 val;
 	int err;

 	err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);

 	if (err)
 		return err;

 	return val;
 }

 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 {
 	return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
 }

 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 {
 	int err, data;

 	mutex_lock(&tps->io_lock);

 	data = tps6507x_pmic_read(tps, reg);
 	if (data < 0) {
 		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 		err = data;
 		goto out;
 	}

 	data |= mask;
 	err = tps6507x_pmic_write(tps, reg, data);
 	if (err)
 		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

 out:
 	mutex_unlock(&tps->io_lock);
 	return err;
 }

 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 {
 	int err, data;

 	mutex_lock(&tps->io_lock);

 	data = tps6507x_pmic_read(tps, reg);
 	if (data < 0) {
 		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 		err = data;
 		goto out;
 	}

 	data &= ~mask;
 	err = tps6507x_pmic_write(tps, reg, data);
 	if (err)
 		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

 out:
 	mutex_unlock(&tps->io_lock);
 	return err;
 }

 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
 {
 	int data;

 	mutex_lock(&tps->io_lock);

 	data = tps6507x_pmic_read(tps, reg);
 	if (data < 0)
 		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);

 	mutex_unlock(&tps->io_lock);
 	return data;
 }

 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 {
 	int err;

 	mutex_lock(&tps->io_lock);

 	err = tps6507x_pmic_write(tps, reg, val);
 	if (err < 0)
 		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

 	mutex_unlock(&tps->io_lock);
 	return err;
 }

 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
 {
 	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 	int data, rid = rdev_get_id(dev);
 	u8 shift;

 	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 		return -EINVAL;

 	shift = TPS6507X_MAX_REG_ID - rid;
 	data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);

 	if (data < 0)
 		return data;
 	else
 		return (data & 1<<shift) ? 1 : 0;
 }

 static int tps6507x_pmic_enable(struct regulator_dev *dev)
 {
 	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 	int rid = rdev_get_id(dev);
 	u8 shift;

 	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 		return -EINVAL;

 	shift = TPS6507X_MAX_REG_ID - rid;
 	return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 }

 static int tps6507x_pmic_disable(struct regulator_dev *dev)
 {
 	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 	int rid = rdev_get_id(dev);
 	u8 shift;

 	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 		return -EINVAL;

 	shift = TPS6507X_MAX_REG_ID - rid;
 	return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
 					1 << shift);
 }

 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
 {
 	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 	int data, rid = rdev_get_id(dev);
 	u8 reg, mask;

 	switch (rid) {
 	case TPS6507X_DCDC_1:
 		reg = TPS6507X_REG_DEFDCDC1;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_DCDC_2:
 		if (tps->info[rid]->defdcdc_default)
 			reg = TPS6507X_REG_DEFDCDC2_HIGH;
 		else
 			reg = TPS6507X_REG_DEFDCDC2_LOW;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_DCDC_3:
 		if (tps->info[rid]->defdcdc_default)
 			reg = TPS6507X_REG_DEFDCDC3_HIGH;
 		else
 			reg = TPS6507X_REG_DEFDCDC3_LOW;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_LDO_1:
 		reg = TPS6507X_REG_LDO_CTRL1;
 		mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 		break;
 	case TPS6507X_LDO_2:
 		reg = TPS6507X_REG_DEFLDO2;
 		mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	data = tps6507x_pmic_reg_read(tps, reg);
 	if (data < 0)
 		return data;

 	data &= mask;
 	return data;
 }

 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
 					  unsigned selector)
 {
 	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 	int data, rid = rdev_get_id(dev);
 	u8 reg, mask;

 	switch (rid) {
 	case TPS6507X_DCDC_1:
 		reg = TPS6507X_REG_DEFDCDC1;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_DCDC_2:
 		if (tps->info[rid]->defdcdc_default)
 			reg = TPS6507X_REG_DEFDCDC2_HIGH;
 		else
 			reg = TPS6507X_REG_DEFDCDC2_LOW;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_DCDC_3:
 		if (tps->info[rid]->defdcdc_default)
 			reg = TPS6507X_REG_DEFDCDC3_HIGH;
 		else
 			reg = TPS6507X_REG_DEFDCDC3_LOW;
 		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 		break;
 	case TPS6507X_LDO_1:
 		reg = TPS6507X_REG_LDO_CTRL1;
 		mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 		break;
 	case TPS6507X_LDO_2:
 		reg = TPS6507X_REG_DEFLDO2;
 		mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	data = tps6507x_pmic_reg_read(tps, reg);
 	if (data < 0)
 		return data;

 	data &= ~mask;
 	data |= selector;

 	return tps6507x_pmic_reg_write(tps, reg, data);
 }

 static struct regulator_ops tps6507x_pmic_ops = {
 	.is_enabled = tps6507x_pmic_is_enabled,
 	.enable = tps6507x_pmic_enable,
 	.disable = tps6507x_pmic_disable,
 	.get_voltage_sel = tps6507x_pmic_get_voltage_sel,
 	.set_voltage_sel = tps6507x_pmic_set_voltage_sel,
 	.list_voltage = regulator_list_voltage_table,
 	.map_voltage = regulator_map_voltage_ascend,
 };

 #ifdef CONFIG_OF
 static struct of_regulator_match tps6507x_matches[] = {
 	{ .name = "VDCDC1"},
 	{ .name = "VDCDC2"},
 	{ .name = "VDCDC3"},
 	{ .name = "LDO1"},
 	{ .name = "LDO2"},
 };

 static struct tps6507x_board *tps6507x_parse_dt_reg_data(
 		struct platform_device *pdev,
 		struct of_regulator_match **tps6507x_reg_matches)
 {
 	struct tps6507x_board *tps_board;
 	struct device_node *np = pdev->dev.parent->of_node;
 	struct device_node *regulators;
 	struct of_regulator_match *matches;
 	static struct regulator_init_data *reg_data;
 	int idx = 0, count, ret;

 	tps_board = devm_kzalloc(&pdev->dev, sizeof(*tps_board),
 					GFP_KERNEL);
 	if (!tps_board) {
 		dev_err(&pdev->dev, "Failure to alloc pdata for regulators.\n");
 		return NULL;
 	}

 	regulators = of_find_node_by_name(np, "regulators");
 	if (!regulators) {
 		dev_err(&pdev->dev, "regulator node not found\n");
 		return NULL;
 	}

 	count = ARRAY_SIZE(tps6507x_matches);
 	matches = tps6507x_matches;

 	ret = of_regulator_match(&pdev->dev, regulators, matches, count);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 			ret);
 		return NULL;
 	}

 	*tps6507x_reg_matches = matches;

 	reg_data = devm_kzalloc(&pdev->dev, (sizeof(struct regulator_init_data)
 					* TPS6507X_NUM_REGULATOR), GFP_KERNEL);
 	if (!reg_data) {
 		dev_err(&pdev->dev, "Failure to alloc init data for regulators.\n");
 		return NULL;
 	}

 	tps_board->tps6507x_pmic_init_data = reg_data;

 	for (idx = 0; idx < count; idx++) {
 		if (!matches[idx].init_data || !matches[idx].of_node)
 			continue;

 		memcpy(&reg_data[idx], matches[idx].init_data,
 				sizeof(struct regulator_init_data));

 	}

 	return tps_board;
 }
 #else
 static inline struct tps6507x_board *tps6507x_parse_dt_reg_data(
 			struct platform_device *pdev,
 			struct of_regulator_match **tps6507x_reg_matches)
 {
 	*tps6507x_reg_matches = NULL;
 	return NULL;
 }
 #endif
 static int tps6507x_pmic_probe(struct platform_device *pdev)
 {
 	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 	struct tps_info *info = &tps6507x_pmic_regs[0];
 	struct regulator_config config = { };
 	struct regulator_init_data *init_data;
 	struct regulator_dev *rdev;
 	struct tps6507x_pmic *tps;
 	struct tps6507x_board *tps_board;
 	struct of_regulator_match *tps6507x_reg_matches = NULL;
 	int i;
 	int error;
 	unsigned int prop;

 	/**
 	 * tps_board points to pmic related constants
 	 * coming from the board-evm file.
 	 */

 	tps_board = dev_get_platdata(tps6507x_dev->dev);
 	if (!tps_board && tps6507x_dev->dev->of_node)
 		tps_board = tps6507x_parse_dt_reg_data(pdev,
 						&tps6507x_reg_matches);
 	if (!tps_board)
 		return -EINVAL;

 	/**
 	 * init_data points to array of regulator_init structures
 	 * coming from the board-evm file.
 	 */
 	init_data = tps_board->tps6507x_pmic_init_data;
 	if (!init_data)
 		return -EINVAL;

 	tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
 	if (!tps)
 		return -ENOMEM;

 	mutex_init(&tps->io_lock);

 	/* common for all regulators */
 	tps->mfd = tps6507x_dev;

 	for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 		/* Register the regulators */
 		tps->info[i] = info;
 		if (init_data->driver_data) {
 			struct tps6507x_reg_platform_data *data =
 							init_data->driver_data;
 			tps->info[i]->defdcdc_default = data->defdcdc_default;
 		}

 		tps->desc[i].name = info->name;
 		tps->desc[i].id = i;
 		tps->desc[i].n_voltages = info->table_len;
 		tps->desc[i].volt_table = info->table;
 		tps->desc[i].ops = &tps6507x_pmic_ops;
 		tps->desc[i].type = REGULATOR_VOLTAGE;
 		tps->desc[i].owner = THIS_MODULE;

 		config.dev = tps6507x_dev->dev;
 		config.init_data = init_data;
 		config.driver_data = tps;

 		if (tps6507x_reg_matches) {
 			error = of_property_read_u32(
 				tps6507x_reg_matches[i].of_node,
 					"ti,defdcdc_default", &prop);

 			if (!error)
 				tps->info[i]->defdcdc_default = prop;

 			config.of_node = tps6507x_reg_matches[i].of_node;
 		}

 		rdev = regulator_register(&tps->desc[i], &config);
 		if (IS_ERR(rdev)) {
 			dev_err(tps6507x_dev->dev,
 				"failed to register %s regulator\n",
 				pdev->name);
 			error = PTR_ERR(rdev);
 			goto fail;
 		}

 		/* Save regulator for cleanup */
 		tps->rdev[i] = rdev;
 	}

 	tps6507x_dev->pmic = tps;
 	platform_set_drvdata(pdev, tps6507x_dev);

 	return 0;

 fail:
 	while (--i >= 0)
 		regulator_unregister(tps->rdev[i]);
 	return error;
 }

 static int tps6507x_pmic_remove(struct platform_device *pdev)
 {
 	struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
 	struct tps6507x_pmic *tps = tps6507x_dev->pmic;
 	int i;

 	for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
 		regulator_unregister(tps->rdev[i]);
 	return 0;
 }

 static struct platform_driver tps6507x_pmic_driver = {
 	.driver = {
 		.name = "tps6507x-pmic",
 		.owner = THIS_MODULE,
 	},
 	.probe = tps6507x_pmic_probe,
 	.remove = tps6507x_pmic_remove,
 };

 static int __init tps6507x_pmic_init(void)
 {
 	return platform_driver_register(&tps6507x_pmic_driver);
 }
 subsys_initcall(tps6507x_pmic_init);

 static void __exit tps6507x_pmic_cleanup(void)
 {
 	platform_driver_unregister(&tps6507x_pmic_driver);
 }
 module_exit(tps6507x_pmic_cleanup);

 MODULE_AUTHOR("Texas Instruments");
 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:tps6507x-pmic");
	/*
	* tps6507x-regulator.c
	*
	* Regulator driver for TPS65073 PMIC
	*
	* Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	* whether express or implied; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/tps6507x.h>
	#include <linux/of.h>
	#include <linux/slab.h>
	#include <linux/mfd/tps6507x.h>
	#include <linux/regulator/of_regulator.h>

	/* DCDC's */
	#define TPS6507X_DCDC_1 0
	#define TPS6507X_DCDC_2 1
	#define TPS6507X_DCDC_3 2
	/* LDOs */
	#define TPS6507X_LDO_1 3
	#define TPS6507X_LDO_2 4

	#define TPS6507X_MAX_REG_ID TPS6507X_LDO_2

	/* Number of step-down converters available */
	#define TPS6507X_NUM_DCDC 3
	/* Number of LDO voltage regulators available */
	#define TPS6507X_NUM_LDO 2
	/* Number of total regulators available */
	#define TPS6507X_NUM_REGULATOR (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)

	/* Supported voltage values for regulators (in microVolts) */
	static const unsigned int VDCDCx_VSEL_table[] = {
	725000, 750000, 775000, 800000,
	825000, 850000, 875000, 900000,
	925000, 950000, 975000, 1000000,
	1025000, 1050000, 1075000, 1100000,
	1125000, 1150000, 1175000, 1200000,
	1225000, 1250000, 1275000, 1300000,
	1325000, 1350000, 1375000, 1400000,
	1425000, 1450000, 1475000, 1500000,
	1550000, 1600000, 1650000, 1700000,
	1750000, 1800000, 1850000, 1900000,
	1950000, 2000000, 2050000, 2100000,
	2150000, 2200000, 2250000, 2300000,
	2350000, 2400000, 2450000, 2500000,
	2550000, 2600000, 2650000, 2700000,
	2750000, 2800000, 2850000, 2900000,
	3000000, 3100000, 3200000, 3300000,
	};

	static const unsigned int LDO1_VSEL_table[] = {
	1000000, 1100000, 1200000, 1250000,
	1300000, 1350000, 1400000, 1500000,
	1600000, 1800000, 2500000, 2750000,
	2800000, 3000000, 3100000, 3300000,
	};

	/* The voltage mapping table for LDO2 is the same as VDCDCx */
	#define LDO2_VSEL_table VDCDCx_VSEL_table

	struct tps_info {
	const char *name;
	u8 table_len;
	const unsigned int *table;

	/* Does DCDC high or the low register defines output voltage? */
	bool defdcdc_default;
	};

	static struct tps_info tps6507x_pmic_regs[] = {
	{
	.name = "VDCDC1",
	.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
	.table = VDCDCx_VSEL_table,
	},
	{
	.name = "VDCDC2",
	.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
	.table = VDCDCx_VSEL_table,
	},
	{
	.name = "VDCDC3",
	.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
	.table = VDCDCx_VSEL_table,
	},
	{
	.name = "LDO1",
	.table_len = ARRAY_SIZE(LDO1_VSEL_table),
	.table = LDO1_VSEL_table,
	},
	{
	.name = "LDO2",
	.table_len = ARRAY_SIZE(LDO2_VSEL_table),
	.table = LDO2_VSEL_table,
	},
	};

	struct tps6507x_pmic {
	struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
	struct tps6507x_dev *mfd;
	struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
	struct tps_info *info[TPS6507X_NUM_REGULATOR];
	struct mutex io_lock;
	};
	static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
	{
	u8 val;
	int err;

	err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);

	if (err)
	return err;

	return val;
	}

	static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
	{
	return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
	}

	static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
	{
	int err, data;

	mutex_lock(&tps->io_lock);

	data = tps6507x_pmic_read(tps, reg);
	if (data < 0) {
	dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
	err = data;
	goto out;
	}

	data \|= mask;
	err = tps6507x_pmic_write(tps, reg, data);
	if (err)
	dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

	out:
	mutex_unlock(&tps->io_lock);
	return err;
	}

	static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
	{
	int err, data;

	mutex_lock(&tps->io_lock);

	data = tps6507x_pmic_read(tps, reg);
	if (data < 0) {
	dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
	err = data;
	goto out;
	}

	data &= ~mask;
	err = tps6507x_pmic_write(tps, reg, data);
	if (err)
	dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

	out:
	mutex_unlock(&tps->io_lock);
	return err;
	}

	static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
	{
	int data;

	mutex_lock(&tps->io_lock);

	data = tps6507x_pmic_read(tps, reg);
	if (data < 0)
	dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);

	mutex_unlock(&tps->io_lock);
	return data;
	}

	static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
	{
	int err;

	mutex_lock(&tps->io_lock);

	err = tps6507x_pmic_write(tps, reg, val);
	if (err < 0)
	dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);

	mutex_unlock(&tps->io_lock);
	return err;
	}

	static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
	{
	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
	int data, rid = rdev_get_id(dev);
	u8 shift;

	if (rid < TPS6507X_DCDC_1 \|\| rid > TPS6507X_LDO_2)
	return -EINVAL;

	shift = TPS6507X_MAX_REG_ID - rid;
	data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);

	if (data < 0)
	return data;
	else
	return (data & 1<<shift) ? 1 : 0;
	}

	static int tps6507x_pmic_enable(struct regulator_dev *dev)
	{
	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
	int rid = rdev_get_id(dev);
	u8 shift;

	if (rid < TPS6507X_DCDC_1 \|\| rid > TPS6507X_LDO_2)
	return -EINVAL;

	shift = TPS6507X_MAX_REG_ID - rid;
	return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
	}

	static int tps6507x_pmic_disable(struct regulator_dev *dev)
	{
	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
	int rid = rdev_get_id(dev);
	u8 shift;

	if (rid < TPS6507X_DCDC_1 \|\| rid > TPS6507X_LDO_2)
	return -EINVAL;

	shift = TPS6507X_MAX_REG_ID - rid;
	return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
	1 << shift);
	}

	static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
	{
	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
	int data, rid = rdev_get_id(dev);
	u8 reg, mask;

	switch (rid) {
	case TPS6507X_DCDC_1:
	reg = TPS6507X_REG_DEFDCDC1;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_DCDC_2:
	if (tps->info[rid]->defdcdc_default)
	reg = TPS6507X_REG_DEFDCDC2_HIGH;
	else
	reg = TPS6507X_REG_DEFDCDC2_LOW;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_DCDC_3:
	if (tps->info[rid]->defdcdc_default)
	reg = TPS6507X_REG_DEFDCDC3_HIGH;
	else
	reg = TPS6507X_REG_DEFDCDC3_LOW;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_LDO_1:
	reg = TPS6507X_REG_LDO_CTRL1;
	mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
	break;
	case TPS6507X_LDO_2:
	reg = TPS6507X_REG_DEFLDO2;
	mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
	break;
	default:
	return -EINVAL;
	}

	data = tps6507x_pmic_reg_read(tps, reg);
	if (data < 0)
	return data;

	data &= mask;
	return data;
	}

	static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
	unsigned selector)
	{
	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
	int data, rid = rdev_get_id(dev);
	u8 reg, mask;

	switch (rid) {
	case TPS6507X_DCDC_1:
	reg = TPS6507X_REG_DEFDCDC1;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_DCDC_2:
	if (tps->info[rid]->defdcdc_default)
	reg = TPS6507X_REG_DEFDCDC2_HIGH;
	else
	reg = TPS6507X_REG_DEFDCDC2_LOW;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_DCDC_3:
	if (tps->info[rid]->defdcdc_default)
	reg = TPS6507X_REG_DEFDCDC3_HIGH;
	else
	reg = TPS6507X_REG_DEFDCDC3_LOW;
	mask = TPS6507X_DEFDCDCX_DCDC_MASK;
	break;
	case TPS6507X_LDO_1:
	reg = TPS6507X_REG_LDO_CTRL1;
	mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
	break;
	case TPS6507X_LDO_2:
	reg = TPS6507X_REG_DEFLDO2;
	mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
	break;
	default:
	return -EINVAL;
	}

	data = tps6507x_pmic_reg_read(tps, reg);
	if (data < 0)
	return data;

	data &= ~mask;
	data \|= selector;

	return tps6507x_pmic_reg_write(tps, reg, data);
	}

	static struct regulator_ops tps6507x_pmic_ops = {
	.is_enabled = tps6507x_pmic_is_enabled,
	.enable = tps6507x_pmic_enable,
	.disable = tps6507x_pmic_disable,
	.get_voltage_sel = tps6507x_pmic_get_voltage_sel,
	.set_voltage_sel = tps6507x_pmic_set_voltage_sel,
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_ascend,
	};

	#ifdef CONFIG_OF
	static struct of_regulator_match tps6507x_matches[] = {
	{ .name = "VDCDC1"},
	{ .name = "VDCDC2"},
	{ .name = "VDCDC3"},
	{ .name = "LDO1"},
	{ .name = "LDO2"},
	};

	static struct tps6507x_board *tps6507x_parse_dt_reg_data(
	struct platform_device *pdev,
	struct of_regulator_match **tps6507x_reg_matches)
	{
	struct tps6507x_board *tps_board;
	struct device_node *np = pdev->dev.parent->of_node;
	struct device_node *regulators;
	struct of_regulator_match *matches;
	static struct regulator_init_data *reg_data;
	int idx = 0, count, ret;

	tps_board = devm_kzalloc(&pdev->dev, sizeof(*tps_board),
	GFP_KERNEL);
	if (!tps_board) {
	dev_err(&pdev->dev, "Failure to alloc pdata for regulators.\n");
	return NULL;
	}

	regulators = of_find_node_by_name(np, "regulators");
	if (!regulators) {
	dev_err(&pdev->dev, "regulator node not found\n");
	return NULL;
	}

	count = ARRAY_SIZE(tps6507x_matches);
	matches = tps6507x_matches;

	ret = of_regulator_match(&pdev->dev, regulators, matches, count);
	if (ret < 0) {
	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
	ret);
	return NULL;
	}

	*tps6507x_reg_matches = matches;

	reg_data = devm_kzalloc(&pdev->dev, (sizeof(struct regulator_init_data)
	* TPS6507X_NUM_REGULATOR), GFP_KERNEL);
	if (!reg_data) {
	dev_err(&pdev->dev, "Failure to alloc init data for regulators.\n");
	return NULL;
	}

	tps_board->tps6507x_pmic_init_data = reg_data;

	for (idx = 0; idx < count; idx++) {
	if (!matches[idx].init_data \|\| !matches[idx].of_node)
	continue;

	memcpy(&reg_data[idx], matches[idx].init_data,
	sizeof(struct regulator_init_data));

	}

	return tps_board;
	}
	#else
	static inline struct tps6507x_board *tps6507x_parse_dt_reg_data(
	struct platform_device *pdev,
	struct of_regulator_match **tps6507x_reg_matches)
	{
	*tps6507x_reg_matches = NULL;
	return NULL;
	}
	#endif
	static int tps6507x_pmic_probe(struct platform_device *pdev)
	{
	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
	struct tps_info *info = &tps6507x_pmic_regs[0];
	struct regulator_config config = { };
	struct regulator_init_data *init_data;
	struct regulator_dev *rdev;
	struct tps6507x_pmic *tps;
	struct tps6507x_board *tps_board;
	struct of_regulator_match *tps6507x_reg_matches = NULL;
	int i;
	int error;
	unsigned int prop;

	/**
	* tps_board points to pmic related constants
	* coming from the board-evm file.
	*/

	tps_board = dev_get_platdata(tps6507x_dev->dev);
	if (!tps_board && tps6507x_dev->dev->of_node)
	tps_board = tps6507x_parse_dt_reg_data(pdev,
	&tps6507x_reg_matches);
	if (!tps_board)
	return -EINVAL;

	/**
	* init_data points to array of regulator_init structures
	* coming from the board-evm file.
	*/
	init_data = tps_board->tps6507x_pmic_init_data;
	if (!init_data)
	return -EINVAL;

	tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
	if (!tps)
	return -ENOMEM;

	mutex_init(&tps->io_lock);

	/* common for all regulators */
	tps->mfd = tps6507x_dev;

	for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
	/* Register the regulators */
	tps->info[i] = info;
	if (init_data->driver_data) {
	struct tps6507x_reg_platform_data *data =
	init_data->driver_data;
	tps->info[i]->defdcdc_default = data->defdcdc_default;
	}

	tps->desc[i].name = info->name;
	tps->desc[i].id = i;
	tps->desc[i].n_voltages = info->table_len;
	tps->desc[i].volt_table = info->table;
	tps->desc[i].ops = &tps6507x_pmic_ops;
	tps->desc[i].type = REGULATOR_VOLTAGE;
	tps->desc[i].owner = THIS_MODULE;

	config.dev = tps6507x_dev->dev;
	config.init_data = init_data;
	config.driver_data = tps;

	if (tps6507x_reg_matches) {
	error = of_property_read_u32(
	tps6507x_reg_matches[i].of_node,
	"ti,defdcdc_default", &prop);

	if (!error)
	tps->info[i]->defdcdc_default = prop;

	config.of_node = tps6507x_reg_matches[i].of_node;
	}

	rdev = regulator_register(&tps->desc[i], &config);
	if (IS_ERR(rdev)) {
	dev_err(tps6507x_dev->dev,
	"failed to register %s regulator\n",
	pdev->name);
	error = PTR_ERR(rdev);
	goto fail;
	}

	/* Save regulator for cleanup */
	tps->rdev[i] = rdev;
	}

	tps6507x_dev->pmic = tps;
	platform_set_drvdata(pdev, tps6507x_dev);

	return 0;

	fail:
	while (--i >= 0)
	regulator_unregister(tps->rdev[i]);
	return error;
	}

	static int tps6507x_pmic_remove(struct platform_device *pdev)
	{
	struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
	struct tps6507x_pmic *tps = tps6507x_dev->pmic;
	int i;

	for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
	regulator_unregister(tps->rdev[i]);
	return 0;
	}

	static struct platform_driver tps6507x_pmic_driver = {
	.driver = {
	.name = "tps6507x-pmic",
	.owner = THIS_MODULE,
	},
	.probe = tps6507x_pmic_probe,
	.remove = tps6507x_pmic_remove,
	};

	static int __init tps6507x_pmic_init(void)
	{
	return platform_driver_register(&tps6507x_pmic_driver);
	}
	subsys_initcall(tps6507x_pmic_init);

	static void __exit tps6507x_pmic_cleanup(void)
	{
	platform_driver_unregister(&tps6507x_pmic_driver);
	}
	module_exit(tps6507x_pmic_cleanup);

	MODULE_AUTHOR("Texas Instruments");
	MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:tps6507x-pmic");