tps65090-regulator.c

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/*
 * Regulator driver for tps65090 power management chip.
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps65090.h>
#include <linux/regulator/tps65090-regulator.h>

struct tps65090_regulator {
    int     id;
    /* used by regulator core */
    struct regulator_desc   desc;

    /* Device */
    struct device       *dev;
};

static struct regulator_ops tps65090_ops = {
    .enable = regulator_enable_regmap,
    .disable = regulator_disable_regmap,
    .is_enabled = regulator_is_enabled_regmap,
};

#define tps65090_REG(_id)               \
{                           \
    .id     = TPS65090_ID_##_id,        \
    .desc = {                   \
        .name = tps65090_rails(_id),        \
        .id = TPS65090_ID_##_id,        \
        .ops = &tps65090_ops,           \
        .type = REGULATOR_VOLTAGE,      \
        .owner = THIS_MODULE,           \
        .enable_reg = (TPS65090_ID_##_id) + 12, \
        .enable_mask = BIT(0),          \
    },                      \
}

static struct tps65090_regulator TPS65090_regulator[] = {
    tps65090_REG(DCDC1),
    tps65090_REG(DCDC2),
    tps65090_REG(DCDC3),
    tps65090_REG(FET1),
    tps65090_REG(FET2),
    tps65090_REG(FET3),
    tps65090_REG(FET4),
    tps65090_REG(FET5),
    tps65090_REG(FET6),
    tps65090_REG(FET7),
};

static inline struct tps65090_regulator *find_regulator_info(int id)
{
    struct tps65090_regulator *ri;
    int i;

    for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
        ri = &TPS65090_regulator[i];
        if (ri->desc.id == id)
            return ri;
    }
    return NULL;
}

static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
{
    struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
    struct tps65090_regulator *ri = NULL;
    struct regulator_config config = { };
    struct regulator_dev *rdev;
    struct tps65090_regulator_platform_data *tps_pdata;
    int id = pdev->id;

    dev_dbg(&pdev->dev, "Probing regulator %d\n", id);

    ri = find_regulator_info(id);
    if (ri == NULL) {
        dev_err(&pdev->dev, "invalid regulator ID specified\n");
        return -EINVAL;
    }
    tps_pdata = pdev->dev.platform_data;
    ri->dev = &pdev->dev;

    config.dev = &pdev->dev;
    config.init_data = &tps_pdata->regulator;
    config.driver_data = ri;
    config.regmap = tps65090_mfd->rmap;

    rdev = regulator_register(&ri->desc, &config);
    if (IS_ERR(rdev)) {
        dev_err(&pdev->dev, "failed to register regulator %s\n",
                ri->desc.name);
        return PTR_ERR(rdev);
    }

    platform_set_drvdata(pdev, rdev);
    return 0;
}

static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
{
    struct regulator_dev *rdev = platform_get_drvdata(pdev);

    regulator_unregister(rdev);
    return 0;
}

static struct platform_driver tps65090_regulator_driver = {
    .driver = {
        .name   = "tps65090-regulator",
        .owner  = THIS_MODULE,
    },
    .probe      = tps65090_regulator_probe,
    .remove     = __devexit_p(tps65090_regulator_remove),
};

static int __init tps65090_regulator_init(void)
{
    return platform_driver_register(&tps65090_regulator_driver);
}
subsys_initcall(tps65090_regulator_init);

static void __exit tps65090_regulator_exit(void)
{
    platform_driver_unregister(&tps65090_regulator_driver);
}
module_exit(tps65090_regulator_exit);

MODULE_DESCRIPTION("tps65090 regulator driver");
MODULE_AUTHOR("Venu Byravarasu <[email protected]>");
MODULE_LICENSE("GPL v2");