tps6105x-regulator.c

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/*
 * Driver for TPS61050/61052 boost converters, typically used for white LEDs
 * or audio amplifiers.
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <[email protected]>
 *
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6105x.h>

static const unsigned int tps6105x_voltages[] = {
    4500000,
    5000000,
    5250000,
    5000000, /* There is an additional 5V */
};

static int tps6105x_regulator_enable(struct regulator_dev *rdev)
{
    struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
    int ret;

    /* Activate voltage mode */
    ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
        TPS6105X_REG0_MODE_MASK,
        TPS6105X_REG0_MODE_VOLTAGE << TPS6105X_REG0_MODE_SHIFT);
    if (ret)
        return ret;

    return 0;
}

static int tps6105x_regulator_disable(struct regulator_dev *rdev)
{
    struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
    int ret;

    /* Set into shutdown mode */
    ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
        TPS6105X_REG0_MODE_MASK,
        TPS6105X_REG0_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
    if (ret)
        return ret;

    return 0;
}

static int tps6105x_regulator_is_enabled(struct regulator_dev *rdev)
{
    struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
    u8 regval;
    int ret;

    ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
    if (ret)
        return ret;
    regval &= TPS6105X_REG0_MODE_MASK;
    regval >>= TPS6105X_REG0_MODE_SHIFT;

    if (regval == TPS6105X_REG0_MODE_VOLTAGE)
        return 1;

    return 0;
}

static int tps6105x_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
    struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
    u8 regval;
    int ret;

    ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
    if (ret)
        return ret;

    regval &= TPS6105X_REG0_VOLTAGE_MASK;
    regval >>= TPS6105X_REG0_VOLTAGE_SHIFT;
    return (int) regval;
}

static int tps6105x_regulator_set_voltage_sel(struct regulator_dev *rdev,
                          unsigned selector)
{
    struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
    int ret;

    ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
                    TPS6105X_REG0_VOLTAGE_MASK,
                    selector << TPS6105X_REG0_VOLTAGE_SHIFT);
    if (ret)
        return ret;

    return 0;
}

static struct regulator_ops tps6105x_regulator_ops = {
    .enable     = tps6105x_regulator_enable,
    .disable    = tps6105x_regulator_disable,
    .is_enabled = tps6105x_regulator_is_enabled,
    .get_voltage_sel = tps6105x_regulator_get_voltage_sel,
    .set_voltage_sel = tps6105x_regulator_set_voltage_sel,
    .list_voltage   = regulator_list_voltage_table,
};

static const struct regulator_desc tps6105x_regulator_desc = {
    .name       = "tps6105x-boost",
    .ops        = &tps6105x_regulator_ops,
    .type       = REGULATOR_VOLTAGE,
    .id     = 0,
    .owner      = THIS_MODULE,
    .n_voltages = ARRAY_SIZE(tps6105x_voltages),
    .volt_table = tps6105x_voltages,
};

/*
 * Registers the chip as a voltage regulator
 */
static int __devinit tps6105x_regulator_probe(struct platform_device *pdev)
{
    struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
    struct tps6105x_platform_data *pdata = tps6105x->pdata;
    struct regulator_config config = { };
    int ret;

    /* This instance is not set for regulator mode so bail out */
    if (pdata->mode != TPS6105X_MODE_VOLTAGE) {
        dev_info(&pdev->dev,
             "chip not in voltage mode mode, exit probe \n");
        return 0;
    }

    config.dev = &tps6105x->client->dev;
    config.init_data = pdata->regulator_data;
    config.driver_data = tps6105x;

    /* Register regulator with framework */
    tps6105x->regulator = regulator_register(&tps6105x_regulator_desc,
                         &config);
    if (IS_ERR(tps6105x->regulator)) {
        ret = PTR_ERR(tps6105x->regulator);
        dev_err(&tps6105x->client->dev,
            "failed to register regulator\n");
        return ret;
    }
    platform_set_drvdata(pdev, tps6105x);

    return 0;
}

static int __devexit tps6105x_regulator_remove(struct platform_device *pdev)
{
    struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
    regulator_unregister(tps6105x->regulator);
    return 0;
}

static struct platform_driver tps6105x_regulator_driver = {
    .driver = {
        .name  = "tps6105x-regulator",
        .owner = THIS_MODULE,
    },
    .probe = tps6105x_regulator_probe,
    .remove = __devexit_p(tps6105x_regulator_remove),
};

static __init int tps6105x_regulator_init(void)
{
    return platform_driver_register(&tps6105x_regulator_driver);
}
subsys_initcall(tps6105x_regulator_init);

static __exit void tps6105x_regulator_exit(void)
{
    platform_driver_unregister(&tps6105x_regulator_driver);
}
module_exit(tps6105x_regulator_exit);

MODULE_AUTHOR("Linus Walleij <[email protected]>");
MODULE_DESCRIPTION("TPS6105x regulator driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps6105x-regulator");