arizona-ldo1.c

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/*
 * arizona-ldo1.c  --  LDO1 supply for Arizona devices
 *
 * Copyright 2012 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/regulator/machine.h>
#include <linux/gpio.h>
#include <linux/slab.h>

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

struct arizona_ldo1 {
    struct regulator_dev *regulator;
    struct arizona *arizona;

    struct regulator_consumer_supply supply;
    struct regulator_init_data init_data;
};

static struct regulator_ops arizona_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,
    .get_bypass = regulator_get_bypass_regmap,
    .set_bypass = regulator_set_bypass_regmap,
};

static const struct regulator_desc arizona_ldo1 = {
    .name = "LDO1",
    .supply_name = "LDOVDD",
    .type = REGULATOR_VOLTAGE,
    .ops = &arizona_ldo1_ops,

    .vsel_reg = ARIZONA_LDO1_CONTROL_1,
    .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
    .bypass_reg = ARIZONA_LDO1_CONTROL_1,
    .bypass_mask = ARIZONA_LDO1_BYPASS,
    .min_uV = 900000,
    .uV_step = 50000,
    .n_voltages = 6,

    .owner = THIS_MODULE,
};

static const struct regulator_init_data arizona_ldo1_default = {
    .constraints = {
        .valid_ops_mask = REGULATOR_CHANGE_STATUS,
    },
    .num_consumer_supplies = 1,
};

static __devinit int arizona_ldo1_probe(struct platform_device *pdev)
{
    struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
    struct regulator_config config = { };
    struct arizona_ldo1 *ldo1;
    int ret;

    ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
    if (ldo1 == NULL) {
        dev_err(&pdev->dev, "Unable to allocate private data\n");
        return -ENOMEM;
    }

    ldo1->arizona = arizona;

    /*
     * Since the chip usually supplies itself we provide some
     * default init_data for it.  This will be overridden with
     * platform data if provided.
     */
    ldo1->init_data = arizona_ldo1_default;
    ldo1->init_data.consumer_supplies = &ldo1->supply;
    ldo1->supply.supply = "DCVDD";
    ldo1->supply.dev_name = dev_name(arizona->dev);

    config.dev = arizona->dev;
    config.driver_data = ldo1;
    config.regmap = arizona->regmap;
    config.ena_gpio = arizona->pdata.ldoena;

    if (arizona->pdata.ldo1)
        config.init_data = arizona->pdata.ldo1;
    else
        config.init_data = &ldo1->init_data;

    ldo1->regulator = regulator_register(&arizona_ldo1, &config);
    if (IS_ERR(ldo1->regulator)) {
        ret = PTR_ERR(ldo1->regulator);
        dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
            ret);
        return ret;
    }

    platform_set_drvdata(pdev, ldo1);

    return 0;
}

static __devexit int arizona_ldo1_remove(struct platform_device *pdev)
{
    struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);

    regulator_unregister(ldo1->regulator);

    return 0;
}

static struct platform_driver arizona_ldo1_driver = {
    .probe = arizona_ldo1_probe,
    .remove = __devexit_p(arizona_ldo1_remove),
    .driver     = {
        .name   = "arizona-ldo1",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(arizona_ldo1_driver);

/* Module information */
MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_DESCRIPTION("Arizona LDO1 driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:arizona-ldo1");