wm8994-regulator.c

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/*
 * wm8994-regulator.c  --  Regulator driver for the WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <[email protected]>
 *
 *  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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/gpio.h>
#include <linux/slab.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/registers.h>
#include <linux/mfd/wm8994/pdata.h>

struct wm8994_ldo {
    struct regulator_dev *regulator;
    struct wm8994 *wm8994;
};

#define WM8994_LDO1_MAX_SELECTOR 0x7
#define WM8994_LDO2_MAX_SELECTOR 0x3

static struct regulator_ops wm8994_ldo1_ops = {
    .list_voltage = regulator_list_voltage_linear,
    .map_voltage = regulator_map_voltage_linear,
    .get_voltage_sel = regulator_get_voltage_sel_regmap,
    .set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
                    unsigned int selector)
{
    struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

    if (selector > WM8994_LDO2_MAX_SELECTOR)
        return -EINVAL;

    switch (ldo->wm8994->type) {
    case WM8994:
        return (selector * 100000) + 900000;
    case WM8958:
        return (selector * 100000) + 1000000;
    case WM1811:
        switch (selector) {
        case 0:
            return -EINVAL;
        default:
            return (selector * 100000) + 950000;
        }
        break;
    default:
        return -EINVAL;
    }
}

static struct regulator_ops wm8994_ldo2_ops = {
    .list_voltage = wm8994_ldo2_list_voltage,
    .get_voltage_sel = regulator_get_voltage_sel_regmap,
    .set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc wm8994_ldo_desc[] = {
    {
        .name = "LDO1",
        .id = 1,
        .type = REGULATOR_VOLTAGE,
        .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
        .vsel_reg = WM8994_LDO_1,
        .vsel_mask = WM8994_LDO1_VSEL_MASK,
        .ops = &wm8994_ldo1_ops,
        .min_uV = 2400000,
        .uV_step = 100000,
        .enable_time = 3000,
        .owner = THIS_MODULE,
    },
    {
        .name = "LDO2",
        .id = 2,
        .type = REGULATOR_VOLTAGE,
        .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
        .vsel_reg = WM8994_LDO_2,
        .vsel_mask = WM8994_LDO2_VSEL_MASK,
        .ops = &wm8994_ldo2_ops,
        .enable_time = 3000,
        .owner = THIS_MODULE,
    },
};

static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
{
    struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
    struct wm8994_pdata *pdata = wm8994->dev->platform_data;
    int id = pdev->id % ARRAY_SIZE(pdata->ldo);
    struct regulator_config config = { };
    struct wm8994_ldo *ldo;
    int ret;

    dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

    ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
    if (ldo == NULL) {
        dev_err(&pdev->dev, "Unable to allocate private data\n");
        return -ENOMEM;
    }

    ldo->wm8994 = wm8994;

    config.dev = wm8994->dev;
    config.driver_data = ldo;
    config.regmap = wm8994->regmap;
    if (pdata) {
        config.init_data = pdata->ldo[id].init_data;
        config.ena_gpio = pdata->ldo[id].enable;
    }

    ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
    if (IS_ERR(ldo->regulator)) {
        ret = PTR_ERR(ldo->regulator);
        dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
            id + 1, ret);
        goto err;
    }

    platform_set_drvdata(pdev, ldo);

    return 0;

err:
    return ret;
}

static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
{
    struct wm8994_ldo *ldo = platform_get_drvdata(pdev);

    platform_set_drvdata(pdev, NULL);

    regulator_unregister(ldo->regulator);

    return 0;
}

static struct platform_driver wm8994_ldo_driver = {
    .probe = wm8994_ldo_probe,
    .remove = __devexit_p(wm8994_ldo_remove),
    .driver     = {
        .name   = "wm8994-ldo",
        .owner  = THIS_MODULE,
    },
};

static int __init wm8994_ldo_init(void)
{
    int ret;

    ret = platform_driver_register(&wm8994_ldo_driver);
    if (ret != 0)
        pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);

    return ret;
}
subsys_initcall(wm8994_ldo_init);

static void __exit wm8994_ldo_exit(void)
{
    platform_driver_unregister(&wm8994_ldo_driver);
}
module_exit(wm8994_ldo_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_DESCRIPTION("WM8994 LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-ldo");