wm831x-ldo.c

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/*
 * wm831x-ldo.c  --  LDO driver for the WM831x series
 *
 * 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/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>

#define WM831X_LDO_MAX_NAME 9

#define WM831X_LDO_CONTROL       0
#define WM831X_LDO_ON_CONTROL    1
#define WM831X_LDO_SLEEP_CONTROL 2

#define WM831X_ALIVE_LDO_ON_CONTROL    0
#define WM831X_ALIVE_LDO_SLEEP_CONTROL 1

struct wm831x_ldo {
    char name[WM831X_LDO_MAX_NAME];
    char supply_name[WM831X_LDO_MAX_NAME];
    struct regulator_desc desc;
    int base;
    struct wm831x *wm831x;
    struct regulator_dev *regulator;
};

/*
 * Shared
 */

static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
{
    struct wm831x_ldo *ldo = data;

    regulator_notifier_call_chain(ldo->regulator,
                      REGULATOR_EVENT_UNDER_VOLTAGE,
                      NULL);

    return IRQ_HANDLED;
}

/*
 * General purpose LDOs
 */

#define WM831X_GP_LDO_SELECTOR_LOW 0xe
#define WM831X_GP_LDO_MAX_SELECTOR 0x1f

static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
                      unsigned int selector)
{
    /* 0.9-1.6V in 50mV steps */
    if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
        return 900000 + (selector * 50000);
    /* 1.7-3.3V in 100mV steps */
    if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
        return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
                  * 100000);
    return -EINVAL;
}

static int wm831x_gp_ldo_map_voltage(struct regulator_dev *rdev,
                     int min_uV, int max_uV)
{
    int volt, vsel;

    if (min_uV < 900000)
        vsel = 0;
    else if (min_uV < 1700000)
        vsel = ((min_uV - 900000) / 50000);
    else
        vsel = ((min_uV - 1700000) / 100000)
            + WM831X_GP_LDO_SELECTOR_LOW + 1;

    volt = wm831x_gp_ldo_list_voltage(rdev, vsel);
    if (volt < min_uV || volt > max_uV)
        return -EINVAL;

    return vsel;
}

static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
                         int uV)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

    sel = wm831x_gp_ldo_map_voltage(rdev, uV, uV);
    if (sel < 0)
        return sel;

    return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
}

static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
    int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    int ret;

    ret = wm831x_reg_read(wm831x, on_reg);
    if (ret < 0)
        return ret;

    if (!(ret & WM831X_LDO1_ON_MODE))
        return REGULATOR_MODE_NORMAL;

    ret = wm831x_reg_read(wm831x, ctrl_reg);
    if (ret < 0)
        return ret;

    if (ret & WM831X_LDO1_LP_MODE)
        return REGULATOR_MODE_STANDBY;
    else
        return REGULATOR_MODE_IDLE;
}

static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
                  unsigned int mode)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
    int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    int ret;


    switch (mode) {
    case REGULATOR_MODE_NORMAL:
        ret = wm831x_set_bits(wm831x, on_reg,
                      WM831X_LDO1_ON_MODE, 0);
        if (ret < 0)
            return ret;
        break;

    case REGULATOR_MODE_IDLE:
        ret = wm831x_set_bits(wm831x, ctrl_reg,
                      WM831X_LDO1_LP_MODE, 0);
        if (ret < 0)
            return ret;

        ret = wm831x_set_bits(wm831x, on_reg,
                      WM831X_LDO1_ON_MODE,
                      WM831X_LDO1_ON_MODE);
        if (ret < 0)
            return ret;
        break;

    case REGULATOR_MODE_STANDBY:
        ret = wm831x_set_bits(wm831x, ctrl_reg,
                      WM831X_LDO1_LP_MODE,
                      WM831X_LDO1_LP_MODE);
        if (ret < 0)
            return ret;

        ret = wm831x_set_bits(wm831x, on_reg,
                      WM831X_LDO1_ON_MODE,
                      WM831X_LDO1_ON_MODE);
        if (ret < 0)
            return ret;
        break;

    default:
        return -EINVAL;
    }

    return 0;
}

static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int mask = 1 << rdev_get_id(rdev);
    int ret;

    /* Is the regulator on? */
    ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
    if (ret < 0)
        return ret;
    if (!(ret & mask))
        return REGULATOR_STATUS_OFF;

    /* Is it reporting under voltage? */
    ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
    if (ret < 0)
        return ret;
    if (ret & mask)
        return REGULATOR_STATUS_ERROR;

    ret = wm831x_gp_ldo_get_mode(rdev);
    if (ret < 0)
        return ret;
    else
        return regulator_mode_to_status(ret);
}

static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
                           int input_uV,
                           int output_uV, int load_uA)
{
    if (load_uA < 20000)
        return REGULATOR_MODE_STANDBY;
    if (load_uA < 50000)
        return REGULATOR_MODE_IDLE;
    return REGULATOR_MODE_NORMAL;
}


static struct regulator_ops wm831x_gp_ldo_ops = {
    .list_voltage = wm831x_gp_ldo_list_voltage,
    .map_voltage = wm831x_gp_ldo_map_voltage,
    .get_voltage_sel = regulator_get_voltage_sel_regmap,
    .set_voltage_sel = regulator_set_voltage_sel_regmap,
    .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
    .get_mode = wm831x_gp_ldo_get_mode,
    .set_mode = wm831x_gp_ldo_set_mode,
    .get_status = wm831x_gp_ldo_get_status,
    .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
    .get_bypass = regulator_get_bypass_regmap,
    .set_bypass = regulator_set_bypass_regmap,

    .is_enabled = regulator_is_enabled_regmap,
    .enable = regulator_enable_regmap,
    .disable = regulator_disable_regmap,
};

static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
{
    struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
    struct wm831x_pdata *pdata = wm831x->dev->platform_data;
    struct regulator_config config = { };
    int id;
    struct wm831x_ldo *ldo;
    struct resource *res;
    int ret, irq;

    if (pdata && pdata->wm831x_num)
        id = (pdata->wm831x_num * 10) + 1;
    else
        id = 0;
    id = pdev->id - id;

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

    ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
    if (ldo == NULL) {
        dev_err(&pdev->dev, "Unable to allocate private data\n");
        return -ENOMEM;
    }

    ldo->wm831x = wm831x;

    res = platform_get_resource(pdev, IORESOURCE_REG, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "No REG resource\n");
        ret = -EINVAL;
        goto err;
    }
    ldo->base = res->start;

    snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
    ldo->desc.name = ldo->name;

    snprintf(ldo->supply_name, sizeof(ldo->supply_name),
         "LDO%dVDD", id + 1);
    ldo->desc.supply_name = ldo->supply_name;

    ldo->desc.id = id;
    ldo->desc.type = REGULATOR_VOLTAGE;
    ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
    ldo->desc.ops = &wm831x_gp_ldo_ops;
    ldo->desc.owner = THIS_MODULE;
    ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
    ldo->desc.enable_reg = WM831X_LDO_ENABLE;
    ldo->desc.enable_mask = 1 << id;
    ldo->desc.bypass_reg = ldo->base;
    ldo->desc.bypass_mask = WM831X_LDO1_SWI;

    config.dev = pdev->dev.parent;
    if (pdata)
        config.init_data = pdata->ldo[id];
    config.driver_data = ldo;
    config.regmap = wm831x->regmap;

    ldo->regulator = regulator_register(&ldo->desc, &config);
    if (IS_ERR(ldo->regulator)) {
        ret = PTR_ERR(ldo->regulator);
        dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
            id + 1, ret);
        goto err;
    }

    irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
    ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
                   IRQF_TRIGGER_RISING, ldo->name,
                   ldo);
    if (ret != 0) {
        dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
            irq, ret);
        goto err_regulator;
    }

    platform_set_drvdata(pdev, ldo);

    return 0;

err_regulator:
    regulator_unregister(ldo->regulator);
err:
    return ret;
}

static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
{
    struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

    platform_set_drvdata(pdev, NULL);

    free_irq(wm831x_irq(ldo->wm831x,
                platform_get_irq_byname(pdev, "UV")), ldo);
    regulator_unregister(ldo->regulator);

    return 0;
}

static struct platform_driver wm831x_gp_ldo_driver = {
    .probe = wm831x_gp_ldo_probe,
    .remove = __devexit_p(wm831x_gp_ldo_remove),
    .driver     = {
        .name   = "wm831x-ldo",
        .owner  = THIS_MODULE,
    },
};

/*
 * Analogue LDOs
 */


#define WM831X_ALDO_SELECTOR_LOW 0xc
#define WM831X_ALDO_MAX_SELECTOR 0x1f

static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
                      unsigned int selector)
{
    /* 1-1.6V in 50mV steps */
    if (selector <= WM831X_ALDO_SELECTOR_LOW)
        return 1000000 + (selector * 50000);
    /* 1.7-3.5V in 100mV steps */
    if (selector <= WM831X_ALDO_MAX_SELECTOR)
        return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
                  * 100000);
    return -EINVAL;
}

static int wm831x_aldo_map_voltage(struct regulator_dev *rdev,
                   int min_uV, int max_uV)
{
    int volt, vsel;

    if (min_uV < 1000000)
        vsel = 0;
    else if (min_uV < 1700000)
        vsel = ((min_uV - 1000000) / 50000);
    else
        vsel = ((min_uV - 1700000) / 100000)
            + WM831X_ALDO_SELECTOR_LOW + 1;

    volt = wm831x_aldo_list_voltage(rdev, vsel);
    if (volt < min_uV || volt > max_uV)
        return -EINVAL;

    return vsel;

}

static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
                         int uV)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

    sel = wm831x_aldo_map_voltage(rdev, uV, uV);
    if (sel < 0)
        return sel;

    return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
}

static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    int ret;

    ret = wm831x_reg_read(wm831x, on_reg);
    if (ret < 0)
        return 0;

    if (ret & WM831X_LDO7_ON_MODE)
        return REGULATOR_MODE_IDLE;
    else
        return REGULATOR_MODE_NORMAL;
}

static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
                  unsigned int mode)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    int ret;


    switch (mode) {
    case REGULATOR_MODE_NORMAL:
        ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
        if (ret < 0)
            return ret;
        break;

    case REGULATOR_MODE_IDLE:
        ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
                      WM831X_LDO7_ON_MODE);
        if (ret < 0)
            return ret;
        break;

    default:
        return -EINVAL;
    }

    return 0;
}

static int wm831x_aldo_get_status(struct regulator_dev *rdev)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int mask = 1 << rdev_get_id(rdev);
    int ret;

    /* Is the regulator on? */
    ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
    if (ret < 0)
        return ret;
    if (!(ret & mask))
        return REGULATOR_STATUS_OFF;

    /* Is it reporting under voltage? */
    ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
    if (ret < 0)
        return ret;
    if (ret & mask)
        return REGULATOR_STATUS_ERROR;

    ret = wm831x_aldo_get_mode(rdev);
    if (ret < 0)
        return ret;
    else
        return regulator_mode_to_status(ret);
}

static struct regulator_ops wm831x_aldo_ops = {
    .list_voltage = wm831x_aldo_list_voltage,
    .map_voltage = wm831x_aldo_map_voltage,
    .get_voltage_sel = regulator_get_voltage_sel_regmap,
    .set_voltage_sel = regulator_set_voltage_sel_regmap,
    .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
    .get_mode = wm831x_aldo_get_mode,
    .set_mode = wm831x_aldo_set_mode,
    .get_status = wm831x_aldo_get_status,
    .set_bypass = regulator_set_bypass_regmap,
    .get_bypass = regulator_get_bypass_regmap,

    .is_enabled = regulator_is_enabled_regmap,
    .enable = regulator_enable_regmap,
    .disable = regulator_disable_regmap,
};

static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
{
    struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
    struct wm831x_pdata *pdata = wm831x->dev->platform_data;
    struct regulator_config config = { };
    int id;
    struct wm831x_ldo *ldo;
    struct resource *res;
    int ret, irq;

    if (pdata && pdata->wm831x_num)
        id = (pdata->wm831x_num * 10) + 1;
    else
        id = 0;
    id = pdev->id - id;

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

    ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
    if (ldo == NULL) {
        dev_err(&pdev->dev, "Unable to allocate private data\n");
        return -ENOMEM;
    }

    ldo->wm831x = wm831x;

    res = platform_get_resource(pdev, IORESOURCE_REG, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "No REG resource\n");
        ret = -EINVAL;
        goto err;
    }
    ldo->base = res->start;

    snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
    ldo->desc.name = ldo->name;

    snprintf(ldo->supply_name, sizeof(ldo->supply_name),
         "LDO%dVDD", id + 1);
    ldo->desc.supply_name = ldo->supply_name;

    ldo->desc.id = id;
    ldo->desc.type = REGULATOR_VOLTAGE;
    ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
    ldo->desc.ops = &wm831x_aldo_ops;
    ldo->desc.owner = THIS_MODULE;
    ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
    ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
    ldo->desc.enable_reg = WM831X_LDO_ENABLE;
    ldo->desc.enable_mask = 1 << id;
    ldo->desc.bypass_reg = ldo->base;
    ldo->desc.bypass_mask = WM831X_LDO7_SWI;

    config.dev = pdev->dev.parent;
    if (pdata)
        config.init_data = pdata->ldo[id];
    config.driver_data = ldo;
    config.regmap = wm831x->regmap;

    ldo->regulator = regulator_register(&ldo->desc, &config);
    if (IS_ERR(ldo->regulator)) {
        ret = PTR_ERR(ldo->regulator);
        dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
            id + 1, ret);
        goto err;
    }

    irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
    ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
                   IRQF_TRIGGER_RISING, ldo->name, ldo);
    if (ret != 0) {
        dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
            irq, ret);
        goto err_regulator;
    }

    platform_set_drvdata(pdev, ldo);

    return 0;

err_regulator:
    regulator_unregister(ldo->regulator);
err:
    return ret;
}

static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
{
    struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

    free_irq(wm831x_irq(ldo->wm831x, platform_get_irq_byname(pdev, "UV")),
         ldo);
    regulator_unregister(ldo->regulator);

    return 0;
}

static struct platform_driver wm831x_aldo_driver = {
    .probe = wm831x_aldo_probe,
    .remove = __devexit_p(wm831x_aldo_remove),
    .driver     = {
        .name   = "wm831x-aldo",
        .owner  = THIS_MODULE,
    },
};

/*
 * Alive LDO
 */

#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf

static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
                         int uV)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;

    sel = regulator_map_voltage_linear(rdev, uV, uV);
    if (sel < 0)
        return sel;

    return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
}

static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
{
    struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
    struct wm831x *wm831x = ldo->wm831x;
    int mask = 1 << rdev_get_id(rdev);
    int ret;

    /* Is the regulator on? */
    ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
    if (ret < 0)
        return ret;
    if (ret & mask)
        return REGULATOR_STATUS_ON;
    else
        return REGULATOR_STATUS_OFF;
}

static struct regulator_ops wm831x_alive_ldo_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,
    .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
    .get_status = wm831x_alive_ldo_get_status,

    .is_enabled = regulator_is_enabled_regmap,
    .enable = regulator_enable_regmap,
    .disable = regulator_disable_regmap,
};

static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
{
    struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
    struct wm831x_pdata *pdata = wm831x->dev->platform_data;
    struct regulator_config config = { };
    int id;
    struct wm831x_ldo *ldo;
    struct resource *res;
    int ret;

    if (pdata && pdata->wm831x_num)
        id = (pdata->wm831x_num * 10) + 1;
    else
        id = 0;
    id = pdev->id - id;


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

    ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
    if (ldo == NULL) {
        dev_err(&pdev->dev, "Unable to allocate private data\n");
        return -ENOMEM;
    }

    ldo->wm831x = wm831x;

    res = platform_get_resource(pdev, IORESOURCE_REG, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "No REG resource\n");
        ret = -EINVAL;
        goto err;
    }
    ldo->base = res->start;

    snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
    ldo->desc.name = ldo->name;

    snprintf(ldo->supply_name, sizeof(ldo->supply_name),
         "LDO%dVDD", id + 1);
    ldo->desc.supply_name = ldo->supply_name;

    ldo->desc.id = id;
    ldo->desc.type = REGULATOR_VOLTAGE;
    ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
    ldo->desc.ops = &wm831x_alive_ldo_ops;
    ldo->desc.owner = THIS_MODULE;
    ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
    ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
    ldo->desc.enable_reg = WM831X_LDO_ENABLE;
    ldo->desc.enable_mask = 1 << id;
    ldo->desc.min_uV = 800000;
    ldo->desc.uV_step = 50000;
    ldo->desc.enable_time = 1000;

    config.dev = pdev->dev.parent;
    if (pdata)
        config.init_data = pdata->ldo[id];
    config.driver_data = ldo;
    config.regmap = wm831x->regmap;

    ldo->regulator = regulator_register(&ldo->desc, &config);
    if (IS_ERR(ldo->regulator)) {
        ret = PTR_ERR(ldo->regulator);
        dev_err(wm831x->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 wm831x_alive_ldo_remove(struct platform_device *pdev)
{
    struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

    regulator_unregister(ldo->regulator);

    return 0;
}

static struct platform_driver wm831x_alive_ldo_driver = {
    .probe = wm831x_alive_ldo_probe,
    .remove = __devexit_p(wm831x_alive_ldo_remove),
    .driver     = {
        .name   = "wm831x-alive-ldo",
        .owner  = THIS_MODULE,
    },
};

static int __init wm831x_ldo_init(void)
{
    int ret;

    ret = platform_driver_register(&wm831x_gp_ldo_driver);
    if (ret != 0)
        pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);

    ret = platform_driver_register(&wm831x_aldo_driver);
    if (ret != 0)
        pr_err("Failed to register WM831x ALDO driver: %d\n", ret);

    ret = platform_driver_register(&wm831x_alive_ldo_driver);
    if (ret != 0)
        pr_err("Failed to register WM831x alive LDO driver: %d\n",
               ret);

    return 0;
}
subsys_initcall(wm831x_ldo_init);

static void __exit wm831x_ldo_exit(void)
{
    platform_driver_unregister(&wm831x_alive_ldo_driver);
    platform_driver_unregister(&wm831x_aldo_driver);
    platform_driver_unregister(&wm831x_gp_ldo_driver);
}
module_exit(wm831x_ldo_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_DESCRIPTION("WM831x LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-ldo");
MODULE_ALIAS("platform:wm831x-aldo");
MODULE_ALIAS("platform:wm831x-aliveldo");