linux-imx

/*

 * 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/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 mutex        mtx;

};

​

static int isl6271a_get_voltage_sel(struct regulator_dev *dev)

{

    struct isl_pmic *pmic = rdev_get_drvdata(dev);

    int idx;

​

    mutex_lock(&pmic->mtx);

​

    idx = i2c_smbus_read_byte(pmic->client);

    if (idx < 0)

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

​

    mutex_unlock(&pmic->mtx);

    return idx;

}

​

static int isl6271a_set_voltage_sel(struct regulator_dev *dev,

                    unsigned selector)

{

    struct isl_pmic *pmic = rdev_get_drvdata(dev);

    int err;

​

    mutex_lock(&pmic->mtx);

​

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

    if (err < 0)

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

​