Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 30e6599d authored by Anuj Aggarwal's avatar Anuj Aggarwal Committed by Liam Girdwood
Browse files

Regulator: Add TPS65023 regulator driver 



Adding support for TI TPS65023 regulator driver

Signed-off-by: default avatarAnuj Aggarwal <anuj.aggarwal@ti.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent e9d62698

drivers/regulator/tps65023-regulator.c

0 → 100644
+631 −0
Original line number Diff line number Diff line 
/*

 * 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[0],

};



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("GPLv2");