drivers/regulator/tps65023-regulator.c - linux - Git at Google

 /*
  * tps65023-regulator.c
  *
  * Supports TPS65023 Regulator
  *
  * 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/i2c.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>

 /* Register definitions */
 #define	TPS65023_REG_VERSION		0
 #define	TPS65023_REG_PGOODZ		1
 #define	TPS65023_REG_MASK		2
 #define	TPS65023_REG_REG_CTRL		3
 #define	TPS65023_REG_CON_CTRL		4
 #define	TPS65023_REG_CON_CTRL2		5
 #define	TPS65023_REG_DEF_CORE		6
 #define	TPS65023_REG_DEFSLEW		7
 #define	TPS65023_REG_LDO_CTRL		8

 /* PGOODZ bitfields */
 #define	TPS65023_PGOODZ_PWRFAILZ	BIT(7)
 #define	TPS65023_PGOODZ_LOWBATTZ	BIT(6)
 #define	TPS65023_PGOODZ_VDCDC1		BIT(5)
 #define	TPS65023_PGOODZ_VDCDC2		BIT(4)
 #define	TPS65023_PGOODZ_VDCDC3		BIT(3)
 #define	TPS65023_PGOODZ_LDO2		BIT(2)
 #define	TPS65023_PGOODZ_LDO1		BIT(1)

 /* MASK bitfields */
 #define	TPS65023_MASK_PWRFAILZ		BIT(7)
 #define	TPS65023_MASK_LOWBATTZ		BIT(6)
 #define	TPS65023_MASK_VDCDC1		BIT(5)
 #define	TPS65023_MASK_VDCDC2		BIT(4)
 #define	TPS65023_MASK_VDCDC3		BIT(3)
 #define	TPS65023_MASK_LDO2		BIT(2)
 #define	TPS65023_MASK_LDO1		BIT(1)

 /* REG_CTRL bitfields */
 #define TPS65023_REG_CTRL_VDCDC1_EN	BIT(5)
 #define TPS65023_REG_CTRL_VDCDC2_EN	BIT(4)
 #define TPS65023_REG_CTRL_VDCDC3_EN	BIT(3)
 #define TPS65023_REG_CTRL_LDO2_EN	BIT(2)
 #define TPS65023_REG_CTRL_LDO1_EN	BIT(1)

 /* REG_CTRL2 bitfields */
 #define TPS65023_REG_CTRL2_GO		BIT(7)
 #define TPS65023_REG_CTRL2_CORE_ADJ	BIT(6)
 #define TPS65023_REG_CTRL2_DCDC2	BIT(2)
 #define TPS65023_REG_CTRL2_DCDC1	BIT(1)
 #define TPS65023_REG_CTRL2_DCDC3	BIT(0)

 /* LDO_CTRL bitfields */
 #define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id)	((ldo_id)*4)
 #define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id)	(0xF0 >> ((ldo_id)*4))

 /* Number of step-down converters available */
 #define TPS65023_NUM_DCDC		3
 /* Number of LDO voltage regulators  available */
 #define TPS65023_NUM_LDO		2
 /* Number of total regulators available */
 #define TPS65023_NUM_REGULATOR	(TPS65023_NUM_DCDC + TPS65023_NUM_LDO)

 /* DCDCs */
 #define TPS65023_DCDC_1			0
 #define TPS65023_DCDC_2			1
 #define TPS65023_DCDC_3			2
 /* LDOs */
 #define TPS65023_LDO_1			3
 #define TPS65023_LDO_2			4

 #define TPS65023_MAX_REG_ID		TPS65023_LDO_2

 /* Supported voltage values for regulators */
 static const u16 VCORE_VSEL_table[] = {
 	800, 825, 850, 875,
 	900, 925, 950, 975,
 	1000, 1025, 1050, 1075,
 	1100, 1125, 1150, 1175,
 	1200, 1225, 1250, 1275,
 	1300, 1325, 1350, 1375,
 	1400, 1425, 1450, 1475,
 	1500, 1525, 1550, 1600,
 };

 /* Supported voltage values for LDO regulators for tps65020 */
 static const u16 TPS65020_LDO1_VSEL_table[] = {
 	1000, 1050, 1100, 1300,
 	1800, 2500, 3000, 3300,
 };

 static const u16 TPS65020_LDO2_VSEL_table[] = {
 	1000, 1050, 1100, 1300,
 	1800, 2500, 3000, 3300,
 };

 /* Supported voltage values for LDO regulators
  * for tps65021 and tps65023 */
 static const u16 TPS65023_LDO1_VSEL_table[] = {
 	1000, 1100, 1300, 1800,
 	2200, 2600, 2800, 3150,
 };

 static const u16 TPS65023_LDO2_VSEL_table[] = {
 	1050, 1200, 1300, 1800,
 	2500, 2800, 3000, 3300,
 };

 /* Regulator specific details */
 struct tps_info {
 	const char *name;
 	unsigned min_uV;
 	unsigned max_uV;
 	bool fixed;
 	u8 table_len;
 	const u16 *table;
 };

 /* PMIC details */
 struct tps_pmic {
 	struct regulator_desc desc[TPS65023_NUM_REGULATOR];
 	struct i2c_client *client;
 	struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
 	const struct tps_info *info[TPS65023_NUM_REGULATOR];
 	struct regmap *regmap;
 	u8 core_regulator;
 };

 /* Struct passed as driver data */
 struct tps_driver_data {
 	const struct tps_info *info;
 	u8 core_regulator;
 };

 static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int data, dcdc = rdev_get_id(dev);
 	int ret;
 	u8 shift;

 	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 		return -EINVAL;

 	shift = TPS65023_NUM_REGULATOR - dcdc;
 	ret = regmap_read(tps->regmap, TPS65023_REG_REG_CTRL, &data);

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

 static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int data, ldo = rdev_get_id(dev);
 	int ret;
 	u8 shift;

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 	ret = regmap_read(tps->regmap, TPS65023_REG_REG_CTRL, &data);

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

 static int tps65023_dcdc_enable(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int dcdc = rdev_get_id(dev);
 	u8 shift;

 	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 		return -EINVAL;

 	shift = TPS65023_NUM_REGULATOR - dcdc;
 	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 1 << shift);
 }

 static int tps65023_dcdc_disable(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int dcdc = rdev_get_id(dev);
 	u8 shift;

 	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 		return -EINVAL;

 	shift = TPS65023_NUM_REGULATOR - dcdc;
 	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 0);
 }

 static int tps65023_ldo_enable(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int ldo = rdev_get_id(dev);
 	u8 shift;

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 1 << shift);
 }

 static int tps65023_ldo_disable(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int ldo = rdev_get_id(dev);
 	u8 shift;

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 0);
 }

 static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int ret;
 	int data, dcdc = rdev_get_id(dev);

 	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 		return -EINVAL;

 	if (dcdc == tps->core_regulator) {
 		ret = regmap_read(tps->regmap, TPS65023_REG_DEF_CORE, &data);
 		if (ret != 0)
 			return ret;
 		data &= (tps->info[dcdc]->table_len - 1);
 		return tps->info[dcdc]->table[data] * 1000;
 	} else
 		return tps->info[dcdc]->min_uV;
 }

 static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
 				     int min_uV, int max_uV,
 				     unsigned *selector)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int dcdc = rdev_get_id(dev);
 	int vsel;
 	int ret;

 	if (dcdc != tps->core_regulator)
 		return -EINVAL;
 	if (min_uV < tps->info[dcdc]->min_uV
 			|| min_uV > tps->info[dcdc]->max_uV)
 		return -EINVAL;
 	if (max_uV < tps->info[dcdc]->min_uV
 			|| max_uV > tps->info[dcdc]->max_uV)
 		return -EINVAL;

 	for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
 		int mV = tps->info[dcdc]->table[vsel];
 		int uV = mV * 1000;

 		/* Break at the first in-range value */
 		if (min_uV <= uV && uV <= max_uV)
 			break;
 	}

 	*selector = vsel;

 	if (vsel == tps->info[dcdc]->table_len)
 		goto failed;

 	ret = regmap_write(tps->regmap, TPS65023_REG_DEF_CORE, vsel);

 	/* Tell the chip that we have changed the value in DEFCORE
 	 * and its time to update the core voltage
 	 */
 	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 			TPS65023_REG_CTRL2_GO, TPS65023_REG_CTRL2_GO);

 	return ret;

 failed:
 	return -EINVAL;
 }

 static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int data, ldo = rdev_get_id(dev);
 	int ret;

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	ret = regmap_read(tps->regmap, TPS65023_REG_LDO_CTRL, &data);
 	if (ret != 0)
 		return ret;

 	data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
 	data &= (tps->info[ldo]->table_len - 1);
 	return tps->info[ldo]->table[data] * 1000;
 }

 static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
 				    int min_uV, int max_uV, unsigned *selector)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int data, vsel, ldo = rdev_get_id(dev);
 	int ret;

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
 		return -EINVAL;
 	if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
 		return -EINVAL;

 	for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
 		int mV = tps->info[ldo]->table[vsel];
 		int uV = mV * 1000;

 		/* Break at the first in-range value */
 		if (min_uV <= uV && uV <= max_uV)
 			break;
 	}

 	if (vsel == tps->info[ldo]->table_len)
 		return -EINVAL;

 	*selector = vsel;

 	ret = regmap_read(tps->regmap, TPS65023_REG_LDO_CTRL, &data);
 	if (ret != 0)
 		return ret;

 	data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
 	data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
 	return regmap_write(tps->regmap, TPS65023_REG_LDO_CTRL, data);
 }

 static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
 					unsigned selector)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int dcdc = rdev_get_id(dev);

 	if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 		return -EINVAL;

 	if (dcdc == tps->core_regulator) {
 		if (selector >= tps->info[dcdc]->table_len)
 			return -EINVAL;
 		else
 			return tps->info[dcdc]->table[selector] * 1000;
 	} else
 		return tps->info[dcdc]->min_uV;
 }

 static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
 					unsigned selector)
 {
 	struct tps_pmic *tps = rdev_get_drvdata(dev);
 	int ldo = rdev_get_id(dev);

 	if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 		return -EINVAL;

 	if (selector >= tps->info[ldo]->table_len)
 		return -EINVAL;
 	else
 		return tps->info[ldo]->table[selector] * 1000;
 }

 /* Operations permitted on VDCDCx */
 static struct regulator_ops tps65023_dcdc_ops = {
 	.is_enabled = tps65023_dcdc_is_enabled,
 	.enable = tps65023_dcdc_enable,
 	.disable = tps65023_dcdc_disable,
 	.get_voltage = tps65023_dcdc_get_voltage,
 	.set_voltage = tps65023_dcdc_set_voltage,
 	.list_voltage = tps65023_dcdc_list_voltage,
 };

 /* Operations permitted on LDOx */
 static struct regulator_ops tps65023_ldo_ops = {
 	.is_enabled = tps65023_ldo_is_enabled,
 	.enable = tps65023_ldo_enable,
 	.disable = tps65023_ldo_disable,
 	.get_voltage = tps65023_ldo_get_voltage,
 	.set_voltage = tps65023_ldo_set_voltage,
 	.list_voltage = tps65023_ldo_list_voltage,
 };

 static struct regmap_config tps65023_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int __devinit tps_65023_probe(struct i2c_client *client,
 				     const struct i2c_device_id *id)
 {
 	const struct tps_driver_data *drv_data = (void *)id->driver_data;
 	const struct tps_info *info = drv_data->info;
 	struct regulator_init_data *init_data;
 	struct regulator_dev *rdev;
 	struct tps_pmic *tps;
 	int i;
 	int error;

 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EIO;

 	/**
 	 * init_data points to array of regulator_init structures
 	 * coming from the board-evm file.
 	 */
 	init_data = client->dev.platform_data;
 	if (!init_data)
 		return -EIO;

 	tps = kzalloc(sizeof(*tps), GFP_KERNEL);
 	if (!tps)
 		return -ENOMEM;

 	tps->regmap = regmap_init_i2c(client, &tps65023_regmap_config);
 	if (IS_ERR(tps->regmap)) {
 		error = PTR_ERR(tps->regmap);
 		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 			error);
 		goto fail_alloc;
 	}

 	/* common for all regulators */
 	tps->client = client;
 	tps->core_regulator = drv_data->core_regulator;

 	for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
 		/* Store regulator specific information */
 		tps->info[i] = info;

 		tps->desc[i].name = info->name;
 		tps->desc[i].id = i;
 		tps->desc[i].n_voltages = info->table_len;
 		tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
 					&tps65023_ldo_ops : &tps65023_dcdc_ops);
 		tps->desc[i].type = REGULATOR_VOLTAGE;
 		tps->desc[i].owner = THIS_MODULE;

 		/* Register the regulators */
 		rdev = regulator_register(&tps->desc[i], &client->dev,
 					  init_data, tps, NULL);
 		if (IS_ERR(rdev)) {
 			dev_err(&client->dev, "failed to register %s\n",
 				id->name);
 			error = PTR_ERR(rdev);
 			goto fail;
 		}

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

 	i2c_set_clientdata(client, tps);

 	/* Enable setting output voltage by I2C */
 	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 			TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);

 	/* Enable setting output voltage by I2C */
 	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 			TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);

 	return 0;

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

 	regmap_exit(tps->regmap);
  fail_alloc:
 	kfree(tps);
 	return error;
 }

 /**
  * tps_65023_remove - TPS65023 driver i2c remove handler
  * @client: i2c driver client device structure
  *
  * Unregister TPS driver as an i2c client device driver
  */
 static int __devexit tps_65023_remove(struct i2c_client *client)
 {
 	struct tps_pmic *tps = i2c_get_clientdata(client);
 	int i;

 	for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
 		regulator_unregister(tps->rdev[i]);

 	regmap_exit(tps->regmap);
 	kfree(tps);

 	return 0;
 }

 static const struct tps_info tps65020_regs[] = {
 	{
 		.name = "VDCDC1",
 		.min_uV = 3300000,
 		.max_uV = 3300000,
 		.fixed	= 1,
 	},
 	{
 		.name = "VDCDC2",
 		.min_uV =  1800000,
 		.max_uV = 1800000,
 		.fixed = 1,
 	},
 	{
 		.name = "VDCDC3",
 		.min_uV =  800000,
 		.max_uV = 1600000,
 		.table_len = ARRAY_SIZE(VCORE_VSEL_table),
 		.table = VCORE_VSEL_table,
 	},

 	{
 		.name = "LDO1",
 		.min_uV = 1000000,
 		.max_uV = 3150000,
 		.table_len = ARRAY_SIZE(TPS65020_LDO1_VSEL_table),
 		.table = TPS65020_LDO1_VSEL_table,
 	},
 	{
 		.name = "LDO2",
 		.min_uV = 1050000,
 		.max_uV = 3300000,
 		.table_len = ARRAY_SIZE(TPS65020_LDO2_VSEL_table),
 		.table = TPS65020_LDO2_VSEL_table,
 	},
 };

 static const struct tps_info tps65021_regs[] = {
 	{
 		.name = "VDCDC1",
 		.min_uV =  3300000,
 		.max_uV = 3300000,
 		.fixed = 1,
 	},
 	{
 		.name = "VDCDC2",
 		.min_uV =  1800000,
 		.max_uV = 1800000,
 		.fixed = 1,
 	},
 	{
 		.name = "VDCDC3",
 		.min_uV =  800000,
 		.max_uV = 1600000,
 		.table_len = ARRAY_SIZE(VCORE_VSEL_table),
 		.table = VCORE_VSEL_table,
 	},
 	{
 		.name = "LDO1",
 		.min_uV = 1000000,
 		.max_uV = 3150000,
 		.table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 		.table = TPS65023_LDO1_VSEL_table,
 	},
 	{
 		.name = "LDO2",
 		.min_uV = 1050000,
 		.max_uV = 3300000,
 		.table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 		.table = TPS65023_LDO2_VSEL_table,
 	},
 };

 static const struct tps_info tps65023_regs[] = {
 	{
 		.name = "VDCDC1",
 		.min_uV =  800000,
 		.max_uV = 1600000,
 		.table_len = ARRAY_SIZE(VCORE_VSEL_table),
 		.table = VCORE_VSEL_table,
 	},
 	{
 		.name = "VDCDC2",
 		.min_uV =  3300000,
 		.max_uV = 3300000,
 		.fixed = 1,
 	},
 	{
 		.name = "VDCDC3",
 		.min_uV =  1800000,
 		.max_uV = 1800000,
 		.fixed = 1,
 	},
 	{
 		.name = "LDO1",
 		.min_uV = 1000000,
 		.max_uV = 3150000,
 		.table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 		.table = TPS65023_LDO1_VSEL_table,
 	},
 	{
 		.name = "LDO2",
 		.min_uV = 1050000,
 		.max_uV = 3300000,
 		.table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 		.table = TPS65023_LDO2_VSEL_table,
 	},
 };

 static struct tps_driver_data tps65020_drv_data = {
 	.info = tps65020_regs,
 	.core_regulator = TPS65023_DCDC_3,
 };

 static struct tps_driver_data tps65021_drv_data = {
 		.info = tps65021_regs,
 		.core_regulator = TPS65023_DCDC_3,
 };

 static struct tps_driver_data tps65023_drv_data = {
 		.info = tps65023_regs,
 		.core_regulator = TPS65023_DCDC_1,
 };

 static const struct i2c_device_id tps_65023_id[] = {
 	{.name = "tps65023",
 	.driver_data = (unsigned long) &tps65023_drv_data},
 	{.name = "tps65021",
 	.driver_data = (unsigned long) &tps65021_drv_data,},
 	{.name = "tps65020",
 	.driver_data = (unsigned long) &tps65020_drv_data},
 	{ },
 };

 MODULE_DEVICE_TABLE(i2c, tps_65023_id);

 static struct i2c_driver tps_65023_i2c_driver = {
 	.driver = {
 		.name = "tps65023",
 		.owner = THIS_MODULE,
 	},
 	.probe = tps_65023_probe,
 	.remove = __devexit_p(tps_65023_remove),
 	.id_table = tps_65023_id,
 };

 /**
  * tps_65023_init
  *
  * Module init function
  */
 static int __init tps_65023_init(void)
 {
 	return i2c_add_driver(&tps_65023_i2c_driver);
 }
 subsys_initcall(tps_65023_init);

 /**
  * tps_65023_cleanup
  *
  * Module exit function
  */
 static void __exit tps_65023_cleanup(void)
 {
 	i2c_del_driver(&tps_65023_i2c_driver);
 }
 module_exit(tps_65023_cleanup);

 MODULE_AUTHOR("Texas Instruments");
 MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
 MODULE_LICENSE("GPL v2");
	/*
	* tps65023-regulator.c
	*
	* Supports TPS65023 Regulator
	*
	* 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/i2c.h>
	#include <linux/delay.h>
	#include <linux/slab.h>
	#include <linux/regmap.h>

	/* Register definitions */
	#define TPS65023_REG_VERSION 0
	#define TPS65023_REG_PGOODZ 1
	#define TPS65023_REG_MASK 2
	#define TPS65023_REG_REG_CTRL 3
	#define TPS65023_REG_CON_CTRL 4
	#define TPS65023_REG_CON_CTRL2 5
	#define TPS65023_REG_DEF_CORE 6
	#define TPS65023_REG_DEFSLEW 7
	#define TPS65023_REG_LDO_CTRL 8

	/* PGOODZ bitfields */
	#define TPS65023_PGOODZ_PWRFAILZ BIT(7)
	#define TPS65023_PGOODZ_LOWBATTZ BIT(6)
	#define TPS65023_PGOODZ_VDCDC1 BIT(5)
	#define TPS65023_PGOODZ_VDCDC2 BIT(4)
	#define TPS65023_PGOODZ_VDCDC3 BIT(3)
	#define TPS65023_PGOODZ_LDO2 BIT(2)
	#define TPS65023_PGOODZ_LDO1 BIT(1)

	/* MASK bitfields */
	#define TPS65023_MASK_PWRFAILZ BIT(7)
	#define TPS65023_MASK_LOWBATTZ BIT(6)
	#define TPS65023_MASK_VDCDC1 BIT(5)
	#define TPS65023_MASK_VDCDC2 BIT(4)
	#define TPS65023_MASK_VDCDC3 BIT(3)
	#define TPS65023_MASK_LDO2 BIT(2)
	#define TPS65023_MASK_LDO1 BIT(1)

	/* REG_CTRL bitfields */
	#define TPS65023_REG_CTRL_VDCDC1_EN BIT(5)
	#define TPS65023_REG_CTRL_VDCDC2_EN BIT(4)
	#define TPS65023_REG_CTRL_VDCDC3_EN BIT(3)
	#define TPS65023_REG_CTRL_LDO2_EN BIT(2)
	#define TPS65023_REG_CTRL_LDO1_EN BIT(1)

	/* REG_CTRL2 bitfields */
	#define TPS65023_REG_CTRL2_GO BIT(7)
	#define TPS65023_REG_CTRL2_CORE_ADJ BIT(6)
	#define TPS65023_REG_CTRL2_DCDC2 BIT(2)
	#define TPS65023_REG_CTRL2_DCDC1 BIT(1)
	#define TPS65023_REG_CTRL2_DCDC3 BIT(0)

	/* LDO_CTRL bitfields */
	#define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id) ((ldo_id)*4)
	#define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id) (0xF0 >> ((ldo_id)*4))

	/* Number of step-down converters available */
	#define TPS65023_NUM_DCDC 3
	/* Number of LDO voltage regulators available */
	#define TPS65023_NUM_LDO 2
	/* Number of total regulators available */
	#define TPS65023_NUM_REGULATOR (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)

	/* DCDCs */
	#define TPS65023_DCDC_1 0
	#define TPS65023_DCDC_2 1
	#define TPS65023_DCDC_3 2
	/* LDOs */
	#define TPS65023_LDO_1 3
	#define TPS65023_LDO_2 4

	#define TPS65023_MAX_REG_ID TPS65023_LDO_2

	/* Supported voltage values for regulators */
	static const u16 VCORE_VSEL_table[] = {
	800, 825, 850, 875,
	900, 925, 950, 975,
	1000, 1025, 1050, 1075,
	1100, 1125, 1150, 1175,
	1200, 1225, 1250, 1275,
	1300, 1325, 1350, 1375,
	1400, 1425, 1450, 1475,
	1500, 1525, 1550, 1600,
	};

	/* Supported voltage values for LDO regulators for tps65020 */
	static const u16 TPS65020_LDO1_VSEL_table[] = {
	1000, 1050, 1100, 1300,
	1800, 2500, 3000, 3300,
	};

	static const u16 TPS65020_LDO2_VSEL_table[] = {
	1000, 1050, 1100, 1300,
	1800, 2500, 3000, 3300,
	};

	/* Supported voltage values for LDO regulators
	* for tps65021 and tps65023 */
	static const u16 TPS65023_LDO1_VSEL_table[] = {
	1000, 1100, 1300, 1800,
	2200, 2600, 2800, 3150,
	};

	static const u16 TPS65023_LDO2_VSEL_table[] = {
	1050, 1200, 1300, 1800,
	2500, 2800, 3000, 3300,
	};

	/* Regulator specific details */
	struct tps_info {
	const char *name;
	unsigned min_uV;
	unsigned max_uV;
	bool fixed;
	u8 table_len;
	const u16 *table;
	};

	/* PMIC details */
	struct tps_pmic {
	struct regulator_desc desc[TPS65023_NUM_REGULATOR];
	struct i2c_client *client;
	struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
	const struct tps_info *info[TPS65023_NUM_REGULATOR];
	struct regmap *regmap;
	u8 core_regulator;
	};

	/* Struct passed as driver data */
	struct tps_driver_data {
	const struct tps_info *info;
	u8 core_regulator;
	};

	static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int data, dcdc = rdev_get_id(dev);
	int ret;
	u8 shift;

	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
	return -EINVAL;

	shift = TPS65023_NUM_REGULATOR - dcdc;
	ret = regmap_read(tps->regmap, TPS65023_REG_REG_CTRL, &data);

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

	static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int data, ldo = rdev_get_id(dev);
	int ret;
	u8 shift;

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
	ret = regmap_read(tps->regmap, TPS65023_REG_REG_CTRL, &data);

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

	static int tps65023_dcdc_enable(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int dcdc = rdev_get_id(dev);
	u8 shift;

	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
	return -EINVAL;

	shift = TPS65023_NUM_REGULATOR - dcdc;
	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 1 << shift);
	}

	static int tps65023_dcdc_disable(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int dcdc = rdev_get_id(dev);
	u8 shift;

	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
	return -EINVAL;

	shift = TPS65023_NUM_REGULATOR - dcdc;
	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 0);
	}

	static int tps65023_ldo_enable(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev);
	u8 shift;

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 1 << shift);
	}

	static int tps65023_ldo_disable(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev);
	u8 shift;

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
	return regmap_update_bits(tps->regmap, TPS65023_REG_REG_CTRL, 1 << shift, 0);
	}

	static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int ret;
	int data, dcdc = rdev_get_id(dev);

	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
	return -EINVAL;

	if (dcdc == tps->core_regulator) {
	ret = regmap_read(tps->regmap, TPS65023_REG_DEF_CORE, &data);
	if (ret != 0)
	return ret;
	data &= (tps->info[dcdc]->table_len - 1);
	return tps->info[dcdc]->table[data] * 1000;
	} else
	return tps->info[dcdc]->min_uV;
	}

	static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
	int min_uV, int max_uV,
	unsigned *selector)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int dcdc = rdev_get_id(dev);
	int vsel;
	int ret;

	if (dcdc != tps->core_regulator)
	return -EINVAL;
	if (min_uV < tps->info[dcdc]->min_uV
	\|\| min_uV > tps->info[dcdc]->max_uV)
	return -EINVAL;
	if (max_uV < tps->info[dcdc]->min_uV
	\|\| max_uV > tps->info[dcdc]->max_uV)
	return -EINVAL;

	for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
	int mV = tps->info[dcdc]->table[vsel];
	int uV = mV * 1000;

	/* Break at the first in-range value */
	if (min_uV <= uV && uV <= max_uV)
	break;
	}

	*selector = vsel;

	if (vsel == tps->info[dcdc]->table_len)
	goto failed;

	ret = regmap_write(tps->regmap, TPS65023_REG_DEF_CORE, vsel);

	/* Tell the chip that we have changed the value in DEFCORE
	* and its time to update the core voltage
	*/
	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
	TPS65023_REG_CTRL2_GO, TPS65023_REG_CTRL2_GO);

	return ret;

	failed:
	return -EINVAL;
	}

	static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int data, ldo = rdev_get_id(dev);
	int ret;

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	ret = regmap_read(tps->regmap, TPS65023_REG_LDO_CTRL, &data);
	if (ret != 0)
	return ret;

	data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
	data &= (tps->info[ldo]->table_len - 1);
	return tps->info[ldo]->table[data] * 1000;
	}

	static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
	int min_uV, int max_uV, unsigned *selector)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int data, vsel, ldo = rdev_get_id(dev);
	int ret;

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	if (min_uV < tps->info[ldo]->min_uV \|\| min_uV > tps->info[ldo]->max_uV)
	return -EINVAL;
	if (max_uV < tps->info[ldo]->min_uV \|\| max_uV > tps->info[ldo]->max_uV)
	return -EINVAL;

	for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
	int mV = tps->info[ldo]->table[vsel];
	int uV = mV * 1000;

	/* Break at the first in-range value */
	if (min_uV <= uV && uV <= max_uV)
	break;
	}

	if (vsel == tps->info[ldo]->table_len)
	return -EINVAL;

	*selector = vsel;

	ret = regmap_read(tps->regmap, TPS65023_REG_LDO_CTRL, &data);
	if (ret != 0)
	return ret;

	data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
	data \|= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
	return regmap_write(tps->regmap, TPS65023_REG_LDO_CTRL, data);
	}

	static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
	unsigned selector)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int dcdc = rdev_get_id(dev);

	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
	return -EINVAL;

	if (dcdc == tps->core_regulator) {
	if (selector >= tps->info[dcdc]->table_len)
	return -EINVAL;
	else
	return tps->info[dcdc]->table[selector] * 1000;
	} else
	return tps->info[dcdc]->min_uV;
	}

	static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
	unsigned selector)
	{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev);

	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
	return -EINVAL;

	if (selector >= tps->info[ldo]->table_len)
	return -EINVAL;
	else
	return tps->info[ldo]->table[selector] * 1000;
	}

	/* Operations permitted on VDCDCx */
	static struct regulator_ops tps65023_dcdc_ops = {
	.is_enabled = tps65023_dcdc_is_enabled,
	.enable = tps65023_dcdc_enable,
	.disable = tps65023_dcdc_disable,
	.get_voltage = tps65023_dcdc_get_voltage,
	.set_voltage = tps65023_dcdc_set_voltage,
	.list_voltage = tps65023_dcdc_list_voltage,
	};

	/* Operations permitted on LDOx */
	static struct regulator_ops tps65023_ldo_ops = {
	.is_enabled = tps65023_ldo_is_enabled,
	.enable = tps65023_ldo_enable,
	.disable = tps65023_ldo_disable,
	.get_voltage = tps65023_ldo_get_voltage,
	.set_voltage = tps65023_ldo_set_voltage,
	.list_voltage = tps65023_ldo_list_voltage,
	};

	static struct regmap_config tps65023_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int __devinit tps_65023_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	const struct tps_driver_data drv_data = (void )id->driver_data;
	const struct tps_info *info = drv_data->info;
	struct regulator_init_data *init_data;
	struct regulator_dev *rdev;
	struct tps_pmic *tps;
	int i;
	int error;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	return -EIO;

	/**
	* init_data points to array of regulator_init structures
	* coming from the board-evm file.
	*/
	init_data = client->dev.platform_data;
	if (!init_data)
	return -EIO;

	tps = kzalloc(sizeof(*tps), GFP_KERNEL);
	if (!tps)
	return -ENOMEM;

	tps->regmap = regmap_init_i2c(client, &tps65023_regmap_config);
	if (IS_ERR(tps->regmap)) {
	error = PTR_ERR(tps->regmap);
	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	error);
	goto fail_alloc;
	}

	/* common for all regulators */
	tps->client = client;
	tps->core_regulator = drv_data->core_regulator;

	for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
	/* Store regulator specific information */
	tps->info[i] = info;

	tps->desc[i].name = info->name;
	tps->desc[i].id = i;
	tps->desc[i].n_voltages = info->table_len;
	tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
	&tps65023_ldo_ops : &tps65023_dcdc_ops);
	tps->desc[i].type = REGULATOR_VOLTAGE;
	tps->desc[i].owner = THIS_MODULE;

	/* Register the regulators */
	rdev = regulator_register(&tps->desc[i], &client->dev,
	init_data, tps, NULL);
	if (IS_ERR(rdev)) {
	dev_err(&client->dev, "failed to register %s\n",
	id->name);
	error = PTR_ERR(rdev);
	goto fail;
	}

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

	i2c_set_clientdata(client, tps);

	/* Enable setting output voltage by I2C */
	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
	TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);

	/* Enable setting output voltage by I2C */
	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
	TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);

	return 0;

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

	regmap_exit(tps->regmap);
	fail_alloc:
	kfree(tps);
	return error;
	}

	/**
	* tps_65023_remove - TPS65023 driver i2c remove handler
	* @client: i2c driver client device structure
	*
	* Unregister TPS driver as an i2c client device driver
	*/
	static int __devexit tps_65023_remove(struct i2c_client *client)
	{
	struct tps_pmic *tps = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
	regulator_unregister(tps->rdev[i]);

	regmap_exit(tps->regmap);
	kfree(tps);

	return 0;
	}

	static const struct tps_info tps65020_regs[] = {
	{
	.name = "VDCDC1",
	.min_uV = 3300000,
	.max_uV = 3300000,
	.fixed = 1,
	},
	{
	.name = "VDCDC2",
	.min_uV = 1800000,
	.max_uV = 1800000,
	.fixed = 1,
	},
	{
	.name = "VDCDC3",
	.min_uV = 800000,
	.max_uV = 1600000,
	.table_len = ARRAY_SIZE(VCORE_VSEL_table),
	.table = VCORE_VSEL_table,
	},

	{
	.name = "LDO1",
	.min_uV = 1000000,
	.max_uV = 3150000,
	.table_len = ARRAY_SIZE(TPS65020_LDO1_VSEL_table),
	.table = TPS65020_LDO1_VSEL_table,
	},
	{
	.name = "LDO2",
	.min_uV = 1050000,
	.max_uV = 3300000,
	.table_len = ARRAY_SIZE(TPS65020_LDO2_VSEL_table),
	.table = TPS65020_LDO2_VSEL_table,
	},
	};

	static const struct tps_info tps65021_regs[] = {
	{
	.name = "VDCDC1",
	.min_uV = 3300000,
	.max_uV = 3300000,
	.fixed = 1,
	},
	{
	.name = "VDCDC2",
	.min_uV = 1800000,
	.max_uV = 1800000,
	.fixed = 1,
	},
	{
	.name = "VDCDC3",
	.min_uV = 800000,
	.max_uV = 1600000,
	.table_len = ARRAY_SIZE(VCORE_VSEL_table),
	.table = VCORE_VSEL_table,
	},
	{
	.name = "LDO1",
	.min_uV = 1000000,
	.max_uV = 3150000,
	.table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
	.table = TPS65023_LDO1_VSEL_table,
	},
	{
	.name = "LDO2",
	.min_uV = 1050000,
	.max_uV = 3300000,
	.table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
	.table = TPS65023_LDO2_VSEL_table,
	},
	};

	static const struct tps_info tps65023_regs[] = {
	{
	.name = "VDCDC1",
	.min_uV = 800000,
	.max_uV = 1600000,
	.table_len = ARRAY_SIZE(VCORE_VSEL_table),
	.table = VCORE_VSEL_table,
	},
	{
	.name = "VDCDC2",
	.min_uV = 3300000,
	.max_uV = 3300000,
	.fixed = 1,
	},
	{
	.name = "VDCDC3",
	.min_uV = 1800000,
	.max_uV = 1800000,
	.fixed = 1,
	},
	{
	.name = "LDO1",
	.min_uV = 1000000,
	.max_uV = 3150000,
	.table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
	.table = TPS65023_LDO1_VSEL_table,
	},
	{
	.name = "LDO2",
	.min_uV = 1050000,
	.max_uV = 3300000,
	.table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
	.table = TPS65023_LDO2_VSEL_table,
	},
	};

	static struct tps_driver_data tps65020_drv_data = {
	.info = tps65020_regs,
	.core_regulator = TPS65023_DCDC_3,
	};

	static struct tps_driver_data tps65021_drv_data = {
	.info = tps65021_regs,
	.core_regulator = TPS65023_DCDC_3,
	};

	static struct tps_driver_data tps65023_drv_data = {
	.info = tps65023_regs,
	.core_regulator = TPS65023_DCDC_1,
	};

	static const struct i2c_device_id tps_65023_id[] = {
	{.name = "tps65023",
	.driver_data = (unsigned long) &tps65023_drv_data},
	{.name = "tps65021",
	.driver_data = (unsigned long) &tps65021_drv_data,},
	{.name = "tps65020",
	.driver_data = (unsigned long) &tps65020_drv_data},
	{ },
	};

	MODULE_DEVICE_TABLE(i2c, tps_65023_id);

	static struct i2c_driver tps_65023_i2c_driver = {
	.driver = {
	.name = "tps65023",
	.owner = THIS_MODULE,
	},
	.probe = tps_65023_probe,
	.remove = __devexit_p(tps_65023_remove),
	.id_table = tps_65023_id,
	};

	/**
	* tps_65023_init
	*
	* Module init function
	*/
	static int __init tps_65023_init(void)
	{
	return i2c_add_driver(&tps_65023_i2c_driver);
	}
	subsys_initcall(tps_65023_init);

	/**
	* tps_65023_cleanup
	*
	* Module exit function
	*/
	static void __exit tps_65023_cleanup(void)
	{
	i2c_del_driver(&tps_65023_i2c_driver);
	}
	module_exit(tps_65023_cleanup);

	MODULE_AUTHOR("Texas Instruments");
	MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
	MODULE_LICENSE("GPL v2");