linux-imx

/*

 * max8952.c - Voltage and current regulation for the Maxim 8952

 *

 * Copyright (C) 2010 Samsung Electronics

 * MyungJoo Ham <myungjoo.ham@samsung.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; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/i2c.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/max8952.h>

#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/regulator/of_regulator.h>

#include <linux/slab.h>

​

/* Registers */

enum {

    MAX8952_REG_MODE0,

    MAX8952_REG_MODE1,

    MAX8952_REG_MODE2,

    MAX8952_REG_MODE3,

    MAX8952_REG_CONTROL,

    MAX8952_REG_SYNC,

    MAX8952_REG_RAMP,

    MAX8952_REG_CHIP_ID1,

    MAX8952_REG_CHIP_ID2,

};

​

struct max8952_data {

    struct i2c_client   *client;

    struct max8952_platform_data *pdata;

​

    bool vid0;

    bool vid1;

};

​

static int max8952_read_reg(struct max8952_data *max8952, u8 reg)

{

    int ret = i2c_smbus_read_byte_data(max8952->client, reg);

​

    if (ret > 0)

        ret &= 0xff;

​

    return ret;

}

​

static int max8952_write_reg(struct max8952_data *max8952,

        u8 reg, u8 value)

{

    return i2c_smbus_write_byte_data(max8952->client, reg, value);

}

​

static int max8952_list_voltage(struct regulator_dev *rdev,

        unsigned int selector)

{

    struct max8952_data *max8952 = rdev_get_drvdata(rdev);

​

    if (rdev_get_id(rdev) != 0)

        return -EINVAL;

​

    return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;

}

​

static int max8952_get_voltage_sel(struct regulator_dev *rdev)

{

    struct max8952_data *max8952 = rdev_get_drvdata(rdev);

    u8 vid = 0;

​

    if (max8952->vid0)

        vid += 1;

    if (max8952->vid1)