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Commit 51bd6943 authored by Marek Vasut's avatar Marek Vasut Committed by Liam Girdwood
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ISL6271A voltage regulator support. 



This device is very simple, it supports one buck and two LDOs. The LDOs are
fixed-voltage. Only the buck is programable over the I2C bus to 16 possible
voltages.

Signed-off-by: default avatarMarek Vasut <marek.vasut@gmail.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 839b8362

drivers/regulator/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -201,6 +201,12 @@ config REGULATOR_88PM8607 
	help

	  This driver supports 88PM8607 voltage regulator chips.



config REGULATOR_ISL6271A

	tristate "Intersil ISL6271A Power regulator"

	depends on I2C

	help

	  This driver supports ISL6271A voltage regulator chip.



config REGULATOR_AD5398

	tristate "Analog Devices AD5398/AD5821 regulators"

	depends on I2C

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -32,5 +32,6 @@ obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o 
obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o

obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o

obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o

obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o



ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/isl6271a-regulator.c

0 → 100644
+236 −0
Original line number Diff line number Diff line 
/*

 * isl6271a-regulator.c

 *

 * Support for Intersil ISL6271A voltage regulator

 *

 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.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/i2c.h>

#include <linux/delay.h>

#include <linux/slab.h>



#define	ISL6271A_VOLTAGE_MIN	850000

#define	ISL6271A_VOLTAGE_MAX	1600000

#define	ISL6271A_VOLTAGE_STEP	50000



/* PMIC details */

struct isl_pmic {

	struct i2c_client	*client;

	struct regulator_dev	*rdev[3];

	struct mutex		mtx;

};



static int isl6271a_get_voltage(struct regulator_dev *dev)

{

	struct isl_pmic *pmic = rdev_get_drvdata(dev);

	int idx, data;



	mutex_lock(&pmic->mtx);



	idx = i2c_smbus_read_byte(pmic->client);

	if (idx < 0) {

		dev_err(&pmic->client->dev, "Error getting voltage\n");

		data = idx;

		goto out;

	}



	/* Convert the data from chip to microvolts */

	data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));



out:

	mutex_unlock(&pmic->mtx);

	return data;

}



static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV)

{

	struct isl_pmic *pmic = rdev_get_drvdata(dev);

	int vsel, err, data;



	if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)

		return -EINVAL;

	if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)

		return -EINVAL;



	/* Align to 50000 mV */

	vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);



	/* If the result fell out of [minuV,maxuV] range, put it back */

	if (vsel < minuV)

		vsel += ISL6271A_VOLTAGE_STEP;



	/* Convert the microvolts to data for the chip */

	data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;



	mutex_lock(&pmic->mtx);



	err = i2c_smbus_write_byte(pmic->client, data);

	if (err < 0)

		dev_err(&pmic->client->dev, "Error setting voltage\n");



	mutex_unlock(&pmic->mtx);

	return err;

}



static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)

{

	return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);

}



static struct regulator_ops isl_core_ops = {

	.get_voltage	= isl6271a_get_voltage,

	.set_voltage	= isl6271a_set_voltage,

	.list_voltage	= isl6271a_list_voltage,

};



static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)

{

	int id = rdev_get_id(dev);

	return (id == 1) ? 1100000 : 1300000;

}



static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)

{

	int id = rdev_get_id(dev);

	return (id == 1) ? 1100000 : 1300000;

}



static struct regulator_ops isl_fixed_ops = {

	.get_voltage	= isl6271a_get_fixed_voltage,

	.list_voltage	= isl6271a_list_fixed_voltage,

};



static struct regulator_desc isl_rd[] = {

	{

		.name		= "Core Buck",

		.id		= 0,

		.n_voltages	= 16,

		.ops		= &isl_core_ops,

		.type		= REGULATOR_VOLTAGE,

		.owner		= THIS_MODULE,

	}, {

		.name		= "LDO1",

		.id		= 1,

		.n_voltages	= 1,

		.ops		= &isl_fixed_ops,

		.type		= REGULATOR_VOLTAGE,

		.owner		= THIS_MODULE,

	}, {

		.name		= "LDO2",

		.id		= 2,

		.n_voltages	= 1,

		.ops		= &isl_fixed_ops,

		.type		= REGULATOR_VOLTAGE,

		.owner		= THIS_MODULE,

	},

};



static int __devinit isl6271a_probe(struct i2c_client *i2c,

				     const struct i2c_device_id *id)

{

	struct regulator_init_data *init_data	= i2c->dev.platform_data;

	struct isl_pmic *pmic;

	int err, i;



	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -EIO;



	if (!init_data) {

		dev_err(&i2c->dev, "no platform data supplied\n");

		return -EIO;

	}



	pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);

	if (!pmic)

		return -ENOMEM;



	pmic->client = i2c;



	mutex_init(&pmic->mtx);



	for (i = 0; i < 3; i++) {

		pmic->rdev[i] = regulator_register(&isl_rd[0], &i2c->dev,

						init_data, pmic);

		if (IS_ERR(pmic->rdev[i])) {

			dev_err(&i2c->dev, "failed to register %s\n", id->name);

			err = PTR_ERR(pmic->rdev);

			goto error;

		}

	}



	i2c_set_clientdata(i2c, pmic);



	return 0;



error:

	while (--i >= 0)

		regulator_unregister(pmic->rdev[i]);



	kfree(pmic);

	return err;

}



static int __devexit isl6271a_remove(struct i2c_client *i2c)

{

	struct isl_pmic *pmic = i2c_get_clientdata(i2c);

	int i;



	i2c_set_clientdata(i2c, NULL);



	for (i = 0; i < 3; i++)

		regulator_unregister(pmic->rdev[i]);



	kfree(pmic);



	return 0;

}



static const struct i2c_device_id isl6271a_id[] = {

	{.name = "isl6271a", 0 },

	{ },

};



MODULE_DEVICE_TABLE(i2c, isl6271a_id);



static struct i2c_driver isl6271a_i2c_driver = {

	.driver = {

		.name = "isl6271a",

		.owner = THIS_MODULE,

	},

	.probe = isl6271a_probe,

	.remove = __devexit_p(isl6271a_remove),

	.id_table = isl6271a_id,

};



static int __init isl6271a_init(void)

{

	return i2c_add_driver(&isl6271a_i2c_driver);

}



static void __exit isl6271a_cleanup(void)

{

	i2c_del_driver(&isl6271a_i2c_driver);

}



subsys_initcall(isl6271a_init);

module_exit(isl6271a_cleanup);



MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");

MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");

MODULE_LICENSE("GPL v2");