[net-next-2.6.git] / drivers / regulator / tps65023-regulator.c

/*
 * 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>

/* 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)

/* 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 VDCDC1_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,
};

static const u16 LDO1_VSEL_table[] = {
	1000, 1100, 1300, 1800,
	2200, 2600, 2800, 3150,
};

static const u16 LDO2_VSEL_table[] = {
	1050, 1200, 1300, 1800,
	2500, 2800, 3000, 3300,
};

static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
				0, 0, ARRAY_SIZE(LDO1_VSEL_table),
				ARRAY_SIZE(LDO2_VSEL_table)};

/* 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 mutex io_lock;
};

static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
{
	return i2c_smbus_read_byte_data(tps->client, reg);
}

static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
{
	return i2c_smbus_write_byte_data(tps->client, reg, val);
}

static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
{
	int err, data;

	mutex_lock(&tps->io_lock);

	data = tps_65023_read(tps, reg);
	if (data < 0) {
		dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
		err = data;
		goto out;
	}

	data |= mask;
	err = tps_65023_write(tps, reg, data);
	if (err)
		dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);

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

static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
{
	int err, data;

	mutex_lock(&tps->io_lock);

	data = tps_65023_read(tps, reg);
	if (data < 0) {
		dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
		err = data;
		goto out;
	}

	data &= ~mask;

	err = tps_65023_write(tps, reg, data);
	if (err)
		dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);

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

}

static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
{
	int data;

	mutex_lock(&tps->io_lock);

	data = tps_65023_read(tps, reg);
	if (data < 0)
		dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);

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

static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
{
	int err;

	mutex_lock(&tps->io_lock);

	err = tps_65023_write(tps, reg, val);
	if (err < 0)
		dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);

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

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);
	u8 shift;

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

	shift = TPS65023_NUM_REGULATOR - dcdc;
	data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);

	if (data < 0)
		return data;
	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);
	u8 shift;

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

	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
	data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);

	if (data < 0)
		return data;
	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 tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 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 tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
}

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 tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 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 tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
}

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

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

	if (dcdc == TPS65023_DCDC_1) {
		data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
		if (data < 0)
			return data;
		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)
{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int dcdc = rdev_get_id(dev);
	int vsel;

	if (dcdc != TPS65023_DCDC_1)
		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;
	}

	/* write to the register in case we found a match */
	if (vsel == tps->info[dcdc]->table_len)
		return -EINVAL;
	else
		return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
}

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);

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

	data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
	if (data < 0)
		return data;

	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)
{
	struct tps_pmic *tps = rdev_get_drvdata(dev);
	int data, vsel, ldo = rdev_get_id(dev);

	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;

	data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
	if (data < 0)
		return data;

	data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
	data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
	return tps_65023_reg_write(tps, 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 == TPS65023_DCDC_1) {
		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
int tps_65023_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	static int desc_id;
	const struct tps_info *info = (void *)id->driver_data;
	struct regulator_init_data *init_data;
	struct regulator_dev *rdev;
	struct tps_pmic *tps;
	int i;

	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;

	mutex_init(&tps->io_lock);

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

	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 = desc_id++;
		tps->desc[i].n_voltages = num_voltages[i];
		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);
		if (IS_ERR(rdev)) {
			dev_err(&client->dev, "failed to register %s\n",
				id->name);

			/* Unregister */
			while (i)
				regulator_unregister(tps->rdev[--i]);

			tps->client = NULL;

			/* clear the client data in i2c */
			i2c_set_clientdata(client, NULL);
			kfree(tps);
			return PTR_ERR(rdev);
		}

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

	i2c_set_clientdata(client, tps);

	return 0;
}

/**
 * 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]);

	tps->client = NULL;

	/* clear the client data in i2c */
	i2c_set_clientdata(client, NULL);
	kfree(tps);

	return 0;
}

static const struct tps_info tps65023_regs[] = {
	{
		.name = "VDCDC1",
		.min_uV =  800000,
		.max_uV = 1600000,
		.table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
		.table = VDCDC1_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(LDO1_VSEL_table),
		.table = LDO1_VSEL_table,
	},
	{
		.name = "LDO2",
		.min_uV = 1050000,
		.max_uV = 3300000,
		.table_len = ARRAY_SIZE(LDO2_VSEL_table),
		.table = LDO2_VSEL_table,
	},
};

static const struct i2c_device_id tps_65023_id[] = {
	{.name = "tps65023",
	.driver_data = (unsigned long) tps65023_regs,},
	{ },
};

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");
Commit	Line	Data
30e6599d AA	1	/*
	2	* tps65023-regulator.c
	3	*
	4	* Supports TPS65023 Regulator
	5	*
	6	* Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation version 2.
	11	*
	12	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	13	* whether express or implied; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/err.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/regulator/driver.h>
	24	#include <linux/regulator/machine.h>
	25	#include <linux/i2c.h>
	26	#include <linux/delay.h>
	27
	28	/* Register definitions */
	29	#define TPS65023_REG_VERSION 0
	30	#define TPS65023_REG_PGOODZ 1
	31	#define TPS65023_REG_MASK 2
	32	#define TPS65023_REG_REG_CTRL 3
	33	#define TPS65023_REG_CON_CTRL 4
	34	#define TPS65023_REG_CON_CTRL2 5
	35	#define TPS65023_REG_DEF_CORE 6
	36	#define TPS65023_REG_DEFSLEW 7
	37	#define TPS65023_REG_LDO_CTRL 8
	38
	39	/* PGOODZ bitfields */
	40	#define TPS65023_PGOODZ_PWRFAILZ BIT(7)
	41	#define TPS65023_PGOODZ_LOWBATTZ BIT(6)
	42	#define TPS65023_PGOODZ_VDCDC1 BIT(5)
	43	#define TPS65023_PGOODZ_VDCDC2 BIT(4)
	44	#define TPS65023_PGOODZ_VDCDC3 BIT(3)
	45	#define TPS65023_PGOODZ_LDO2 BIT(2)
	46	#define TPS65023_PGOODZ_LDO1 BIT(1)
	47
	48	/* MASK bitfields */
	49	#define TPS65023_MASK_PWRFAILZ BIT(7)
	50	#define TPS65023_MASK_LOWBATTZ BIT(6)
	51	#define TPS65023_MASK_VDCDC1 BIT(5)
	52	#define TPS65023_MASK_VDCDC2 BIT(4)
	53	#define TPS65023_MASK_VDCDC3 BIT(3)
	54	#define TPS65023_MASK_LDO2 BIT(2)
	55	#define TPS65023_MASK_LDO1 BIT(1)
	56
	57	/* REG_CTRL bitfields */
	58	#define TPS65023_REG_CTRL_VDCDC1_EN BIT(5)
	59	#define TPS65023_REG_CTRL_VDCDC2_EN BIT(4)
	60	#define TPS65023_REG_CTRL_VDCDC3_EN BIT(3)
	61	#define TPS65023_REG_CTRL_LDO2_EN BIT(2)
	62	#define TPS65023_REG_CTRL_LDO1_EN BIT(1)
	63
	64	/* LDO_CTRL bitfields */
65	#define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id) ((ldo_id)*4)
66	#define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id) (0xF0 >> ((ldo_id)*4))
67
68	/* Number of step-down converters available */
69	#define TPS65023_NUM_DCDC 3
70	/* Number of LDO voltage regulators available */
71	#define TPS65023_NUM_LDO 2
72	/* Number of total regulators available */
73	#define TPS65023_NUM_REGULATOR (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
74
75	/* DCDCs */
76	#define TPS65023_DCDC_1 0
77	#define TPS65023_DCDC_2 1
78	#define TPS65023_DCDC_3 2
79	/* LDOs */
80	#define TPS65023_LDO_1 3
81	#define TPS65023_LDO_2 4
82
83	#define TPS65023_MAX_REG_ID TPS65023_LDO_2
84
85	/* Supported voltage values for regulators */
86	static const u16 VDCDC1_VSEL_table[] = {
87	800, 825, 850, 875,
88	900, 925, 950, 975,
89	1000, 1025, 1050, 1075,
90	1100, 1125, 1150, 1175,
91	1200, 1225, 1250, 1275,
92	1300, 1325, 1350, 1375,
93	1400, 1425, 1450, 1475,
94	1500, 1525, 1550, 1600,
95	};
96
97	static const u16 LDO1_VSEL_table[] = {
98	1000, 1100, 1300, 1800,
99	2200, 2600, 2800, 3150,
100	};
101
102	static const u16 LDO2_VSEL_table[] = {
103	1050, 1200, 1300, 1800,
104	2500, 2800, 3000, 3300,
105	};
106
107	static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
108	0, 0, ARRAY_SIZE(LDO1_VSEL_table),
109	ARRAY_SIZE(LDO2_VSEL_table)};
110
111	/* Regulator specific details */
112	struct tps_info {
113	const char *name;
114	unsigned min_uV;
115	unsigned max_uV;
116	bool fixed;
117	u8 table_len;
118	const u16 *table;
119	};
120
121	/* PMIC details */
122	struct tps_pmic {
123	struct regulator_desc desc[TPS65023_NUM_REGULATOR];
124	struct i2c_client *client;
125	struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
126	const struct tps_info *info[TPS65023_NUM_REGULATOR];
127	struct mutex io_lock;
128	};
129
130	static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
131	{
132	return i2c_smbus_read_byte_data(tps->client, reg);
133	}
134
135	static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
136	{
137	return i2c_smbus_write_byte_data(tps->client, reg, val);
138	}
139
140	static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
141	{
142	int err, data;
143
144	mutex_lock(&tps->io_lock);
145
146	data = tps_65023_read(tps, reg);
147	if (data < 0) {
148	dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
149	err = data;
150	goto out;
151	}
152
153	data \|= mask;
154	err = tps_65023_write(tps, reg, data);
155	if (err)
156	dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
157
158	out:
159	mutex_unlock(&tps->io_lock);
160	return err;
161	}
162
163	static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
164	{
165	int err, data;
166
167	mutex_lock(&tps->io_lock);
168
169	data = tps_65023_read(tps, reg);
170	if (data < 0) {
171	dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
172	err = data;
173	goto out;
174	}
175
176	data &= ~mask;
177
178	err = tps_65023_write(tps, reg, data);
179	if (err)
180	dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
181
182	out:
183	mutex_unlock(&tps->io_lock);
184	return err;
185
186	}
187
188	static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
189	{
190	int data;
191
192	mutex_lock(&tps->io_lock);
193
194	data = tps_65023_read(tps, reg);
195	if (data < 0)
196	dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
197
198	mutex_unlock(&tps->io_lock);
199	return data;
200	}
201
202	static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
203	{
204	int err;
205
206	mutex_lock(&tps->io_lock);
207
208	err = tps_65023_write(tps, reg, val);
209	if (err < 0)
210	dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
211
212	mutex_unlock(&tps->io_lock);
213	return err;
214	}
215
216	static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
217	{
218	struct tps_pmic *tps = rdev_get_drvdata(dev);
219	int data, dcdc = rdev_get_id(dev);
220	u8 shift;
221
222	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
223	return -EINVAL;
224
225	shift = TPS65023_NUM_REGULATOR - dcdc;
226	data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
227
228	if (data < 0)
229	return data;
230	else
231	return (data & 1<<shift) ? 1 : 0;
232	}
233
234	static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
235	{
236	struct tps_pmic *tps = rdev_get_drvdata(dev);
237	int data, ldo = rdev_get_id(dev);
238	u8 shift;
239
240	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
241	return -EINVAL;
242
243	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
244	data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
245
246	if (data < 0)
247	return data;
248	else
249	return (data & 1<<shift) ? 1 : 0;
250	}
251
252	static int tps65023_dcdc_enable(struct regulator_dev *dev)
253	{
254	struct tps_pmic *tps = rdev_get_drvdata(dev);
255	int dcdc = rdev_get_id(dev);
256	u8 shift;
257
258	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
259	return -EINVAL;
260
261	shift = TPS65023_NUM_REGULATOR - dcdc;
262	return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
263	}
264
265	static int tps65023_dcdc_disable(struct regulator_dev *dev)
266	{
267	struct tps_pmic *tps = rdev_get_drvdata(dev);
268	int dcdc = rdev_get_id(dev);
269	u8 shift;
270
271	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
272	return -EINVAL;
273
274	shift = TPS65023_NUM_REGULATOR - dcdc;
275	return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
276	}
277
278	static int tps65023_ldo_enable(struct regulator_dev *dev)
279	{
280	struct tps_pmic *tps = rdev_get_drvdata(dev);
281	int ldo = rdev_get_id(dev);
282	u8 shift;
283
284	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
285	return -EINVAL;
286
287	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
288	return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
289	}
290
291	static int tps65023_ldo_disable(struct regulator_dev *dev)
292	{
293	struct tps_pmic *tps = rdev_get_drvdata(dev);
294	int ldo = rdev_get_id(dev);
295	u8 shift;
296
297	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
298	return -EINVAL;
299
300	shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
301	return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
302	}
303
304	static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
305	{
306	struct tps_pmic *tps = rdev_get_drvdata(dev);
307	int data, dcdc = rdev_get_id(dev);
308
309	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
310	return -EINVAL;
311
312	if (dcdc == TPS65023_DCDC_1) {
313	data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
314	if (data < 0)
315	return data;
316	data &= (tps->info[dcdc]->table_len - 1);
317	return tps->info[dcdc]->table[data] * 1000;
318	} else
319	return tps->info[dcdc]->min_uV;
320	}
321
322	static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
323	int min_uV, int max_uV)
324	{
325	struct tps_pmic *tps = rdev_get_drvdata(dev);
326	int dcdc = rdev_get_id(dev);
327	int vsel;
328
329	if (dcdc != TPS65023_DCDC_1)
330	return -EINVAL;
331
332	if (min_uV < tps->info[dcdc]->min_uV
333	\|\| min_uV > tps->info[dcdc]->max_uV)
334	return -EINVAL;
335	if (max_uV < tps->info[dcdc]->min_uV
336	\|\| max_uV > tps->info[dcdc]->max_uV)
337	return -EINVAL;
338
339	for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
340	int mV = tps->info[dcdc]->table[vsel];
341	int uV = mV * 1000;
342
343	/* Break at the first in-range value */
344	if (min_uV <= uV && uV <= max_uV)
345	break;
346	}
347
348	/* write to the register in case we found a match */
349	if (vsel == tps->info[dcdc]->table_len)
350	return -EINVAL;
351	else
352	return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
353	}
354
355	static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
356	{
357	struct tps_pmic *tps = rdev_get_drvdata(dev);
358	int data, ldo = rdev_get_id(dev);
359
360	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
361	return -EINVAL;
362
363	data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
364	if (data < 0)
365	return data;
366
367	data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
368	data &= (tps->info[ldo]->table_len - 1);
369	return tps->info[ldo]->table[data] * 1000;
370	}
371
372	static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
373	int min_uV, int max_uV)
374	{
375	struct tps_pmic *tps = rdev_get_drvdata(dev);
376	int data, vsel, ldo = rdev_get_id(dev);
377
378	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
379	return -EINVAL;
380
381	if (min_uV < tps->info[ldo]->min_uV \|\| min_uV > tps->info[ldo]->max_uV)
382	return -EINVAL;
383	if (max_uV < tps->info[ldo]->min_uV \|\| max_uV > tps->info[ldo]->max_uV)
384	return -EINVAL;
385
386	for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
387	int mV = tps->info[ldo]->table[vsel];
388	int uV = mV * 1000;
389
390	/* Break at the first in-range value */
391	if (min_uV <= uV && uV <= max_uV)
392	break;
393	}
394
395	if (vsel == tps->info[ldo]->table_len)
396	return -EINVAL;
397
398	data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
399	if (data < 0)
400	return data;
401
402	data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
403	data \|= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
404	return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
405	}
406
407	static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
408	unsigned selector)
409	{
410	struct tps_pmic *tps = rdev_get_drvdata(dev);
411	int dcdc = rdev_get_id(dev);
412
413	if (dcdc < TPS65023_DCDC_1 \|\| dcdc > TPS65023_DCDC_3)
414	return -EINVAL;
415
416	if (dcdc == TPS65023_DCDC_1) {
417	if (selector >= tps->info[dcdc]->table_len)
418	return -EINVAL;
419	else
420	return tps->info[dcdc]->table[selector] * 1000;
421	} else
422	return tps->info[dcdc]->min_uV;
423	}
424
425	static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
426	unsigned selector)
427	{
428	struct tps_pmic *tps = rdev_get_drvdata(dev);
429	int ldo = rdev_get_id(dev);
430
431	if (ldo < TPS65023_LDO_1 \|\| ldo > TPS65023_LDO_2)
432	return -EINVAL;
433
434	if (selector >= tps->info[ldo]->table_len)
435	return -EINVAL;
436	else
437	return tps->info[ldo]->table[selector] * 1000;
438	}
439
440	/* Operations permitted on VDCDCx */
441	static struct regulator_ops tps65023_dcdc_ops = {
442	.is_enabled = tps65023_dcdc_is_enabled,
443	.enable = tps65023_dcdc_enable,
444	.disable = tps65023_dcdc_disable,
445	.get_voltage = tps65023_dcdc_get_voltage,
446	.set_voltage = tps65023_dcdc_set_voltage,
447	.list_voltage = tps65023_dcdc_list_voltage,
448	};
449
450	/* Operations permitted on LDOx */
451	static struct regulator_ops tps65023_ldo_ops = {
452	.is_enabled = tps65023_ldo_is_enabled,
453	.enable = tps65023_ldo_enable,
454	.disable = tps65023_ldo_disable,
455	.get_voltage = tps65023_ldo_get_voltage,
456	.set_voltage = tps65023_ldo_set_voltage,
457	.list_voltage = tps65023_ldo_list_voltage,
458	};
459
460	static
461	int tps_65023_probe(struct i2c_client client, const struct i2c_device_id id)
462	{
463	static int desc_id;
464	const struct tps_info info = (void )id->driver_data;
465	struct regulator_init_data *init_data;
466	struct regulator_dev *rdev;
467	struct tps_pmic *tps;
468	int i;
469
470	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
471	return -EIO;
472
473	/**
474	* init_data points to array of regulator_init structures
475	* coming from the board-evm file.
476	*/
477	init_data = client->dev.platform_data;
478
479	if (!init_data)
480	return -EIO;
481
482	tps = kzalloc(sizeof(*tps), GFP_KERNEL);
483	if (!tps)
484	return -ENOMEM;
485
486	mutex_init(&tps->io_lock);
487
488	/* common for all regulators */
489	tps->client = client;
490
491	for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
492	/* Store regulator specific information */
493	tps->info[i] = info;
494
495	tps->desc[i].name = info->name;
496	tps->desc[i].id = desc_id++;
497	tps->desc[i].n_voltages = num_voltages[i];
498	tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
499	&tps65023_ldo_ops : &tps65023_dcdc_ops);
500	tps->desc[i].type = REGULATOR_VOLTAGE;
501	tps->desc[i].owner = THIS_MODULE;
502
503	/* Register the regulators */
504	rdev = regulator_register(&tps->desc[i], &client->dev,
505	init_data, tps);
506	if (IS_ERR(rdev)) {
507	dev_err(&client->dev, "failed to register %s\n",
508	id->name);
509
510	/* Unregister */
511	while (i)
512	regulator_unregister(tps->rdev[--i]);
513
514	tps->client = NULL;
515
516	/* clear the client data in i2c */
517	i2c_set_clientdata(client, NULL);
518	kfree(tps);
519	return PTR_ERR(rdev);
520	}
521
522	/* Save regulator for cleanup */
523	tps->rdev[i] = rdev;
524	}
525
526	i2c_set_clientdata(client, tps);
527
528	return 0;
529	}
530
531	/**
532	* tps_65023_remove - TPS65023 driver i2c remove handler
533	* @client: i2c driver client device structure
534	*
535	* Unregister TPS driver as an i2c client device driver
536	*/
537	static int __devexit tps_65023_remove(struct i2c_client *client)
538	{
539	struct tps_pmic *tps = i2c_get_clientdata(client);
540	int i;
541
542	for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
543	regulator_unregister(tps->rdev[i]);
544
545	tps->client = NULL;
546
547	/* clear the client data in i2c */
548	i2c_set_clientdata(client, NULL);
549	kfree(tps);
550
551	return 0;
552	}
553
554	static const struct tps_info tps65023_regs[] = {
555	{
556	.name = "VDCDC1",
557	.min_uV = 800000,
558	.max_uV = 1600000,
559	.table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
560	.table = VDCDC1_VSEL_table,
561	},
562	{
563	.name = "VDCDC2",
564	.min_uV = 3300000,
565	.max_uV = 3300000,
566	.fixed = 1,
567	},
568	{
569	.name = "VDCDC3",
570	.min_uV = 1800000,
571	.max_uV = 1800000,
572	.fixed = 1,
573	},
574	{
575	.name = "LDO1",
576	.min_uV = 1000000,
577	.max_uV = 3150000,
578	.table_len = ARRAY_SIZE(LDO1_VSEL_table),
579	.table = LDO1_VSEL_table,
580	},
581	{
582	.name = "LDO2",
583	.min_uV = 1050000,
584	.max_uV = 3300000,
585	.table_len = ARRAY_SIZE(LDO2_VSEL_table),
586	.table = LDO2_VSEL_table,
587	},
588	};
589
9e108d33 LG	590	static const struct i2c_device_id tps_65023_id[] = {
	591	{.name = "tps65023",
	592	.driver_data = (unsigned long) tps65023_regs,},
	593	{ },
30e6599d AA	594	};
	595
	596	MODULE_DEVICE_TABLE(i2c, tps_65023_id);
	597
	598	static struct i2c_driver tps_65023_i2c_driver = {
	599	.driver = {
	600	.name = "tps65023",
	601	.owner = THIS_MODULE,
	602	},
	603	.probe = tps_65023_probe,
	604	.remove = __devexit_p(tps_65023_remove),
9e108d33	605	.id_table = tps_65023_id,
30e6599d AA	606	};
	607
	608	/**
	609	* tps_65023_init
	610	*
	611	* Module init function
	612	*/
	613	static int __init tps_65023_init(void)
	614	{
	615	return i2c_add_driver(&tps_65023_i2c_driver);
	616	}
	617	subsys_initcall(tps_65023_init);
	618
	619	/**
	620	* tps_65023_cleanup
	621	*
	622	* Module exit function
	623	*/
	624	static void __exit tps_65023_cleanup(void)
	625	{
	626	i2c_del_driver(&tps_65023_i2c_driver);
	627	}
	628	module_exit(tps_65023_cleanup);
	629
	630	MODULE_AUTHOR("Texas Instruments");
	631	MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
9e108d33	632	MODULE_LICENSE("GPL v2");