arizona-micsupp.c

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/*
 * arizona-micsupp.c  --  Microphone 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>

#define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f

struct arizona_micsupp {
    struct regulator_dev *regulator;
    struct arizona *arizona;

    struct regulator_consumer_supply supply;
    struct regulator_init_data init_data;
};

static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
                    unsigned int selector)
{
    if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
        return -EINVAL;

    if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
        return 3300000;
    else
        return (selector * 50000) + 1700000;
}

static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
                       int min_uV, int max_uV)
{
    unsigned int voltage;
    int selector;

    if (min_uV < 1700000)
        min_uV = 1700000;

    if (min_uV > 3200000)
        selector = ARIZONA_MICSUPP_MAX_SELECTOR;
    else
        selector = DIV_ROUND_UP(min_uV - 1700000, 50000);

    if (selector < 0)
        return -EINVAL;

    voltage = arizona_micsupp_list_voltage(rdev, selector);
    if (voltage < min_uV || voltage > max_uV)
        return -EINVAL;

    return selector;
}

static struct regulator_ops arizona_micsupp_ops = {
    .enable = regulator_enable_regmap,
    .disable = regulator_disable_regmap,
    .is_enabled = regulator_is_enabled_regmap,

    .list_voltage = arizona_micsupp_list_voltage,
    .map_voltage = arizona_micsupp_map_voltage,

    .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_micsupp = {
    .name = "MICVDD",
    .supply_name = "CPVDD",
    .type = REGULATOR_VOLTAGE,
    .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
    .ops = &arizona_micsupp_ops,

    .vsel_reg = ARIZONA_LDO2_CONTROL_1,
    .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
    .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
    .enable_mask = ARIZONA_CPMIC_ENA,
    .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
    .bypass_mask = ARIZONA_CPMIC_BYPASS,

    .owner = THIS_MODULE,
};

static const struct regulator_init_data arizona_micsupp_default = {
    .constraints = {
        .valid_ops_mask = REGULATOR_CHANGE_STATUS |
                REGULATOR_CHANGE_VOLTAGE,
        .min_uV = 1700000,
        .max_uV = 3300000,
    },

    .num_consumer_supplies = 1,
};

static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
{
    struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
    struct regulator_config config = { };
    struct arizona_micsupp *micsupp;
    int ret;

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

    micsupp->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.
     */
    micsupp->init_data = arizona_micsupp_default;
    micsupp->init_data.consumer_supplies = &micsupp->supply;
    micsupp->supply.supply = "MICVDD";
    micsupp->supply.dev_name = dev_name(arizona->dev);

    config.dev = arizona->dev;
    config.driver_data = micsupp;
    config.regmap = arizona->regmap;

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

    /* Default to regulated mode until the API supports bypass */
    regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
               ARIZONA_CPMIC_BYPASS, 0);

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

    platform_set_drvdata(pdev, micsupp);

    return 0;
}

static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
{
    struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);

    regulator_unregister(micsupp->regulator);

    return 0;
}

static struct platform_driver arizona_micsupp_driver = {
    .probe = arizona_micsupp_probe,
    .remove = __devexit_p(arizona_micsupp_remove),
    .driver     = {
        .name   = "arizona-micsupp",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(arizona_micsupp_driver);

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