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    Subject[PATCH] regulator: arizona: Add support for microphone supplies on Arizona devices
    Date
    The Wolfson Arizona platform is used for a range of low power audio hub
    CODECs. Many of these devices feature an integrated power supply for the
    microphone which is supported by this driver.

    Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
    ---
    drivers/regulator/Kconfig | 7 ++
    drivers/regulator/Makefile | 1 +
    drivers/regulator/arizona-micsupp.c | 184 +++++++++++++++++++++++++++++++++++
    3 files changed, 192 insertions(+)
    create mode 100644 drivers/regulator/arizona-micsupp.c

    diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
    index 00ffe05..3211176 100644
    --- a/drivers/regulator/Kconfig
    +++ b/drivers/regulator/Kconfig
    @@ -88,6 +88,13 @@ config REGULATOR_AAT2870
    If you have a AnalogicTech AAT2870 say Y to enable the
    regulator driver.

    +config REGULATOR_ARIZONA
    + tristate "Wolfson Arizona class devices"
    + depends on MFD_ARIZONA
    + help
    + Support for the regulators found on Wolfson Arizona class
    + devices.
    +
    config REGULATOR_DA903X
    tristate "Dialog Semiconductor DA9030/DA9034 regulators"
    depends on PMIC_DA903X
    diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
    index d8544539..f1bddce 100644
    --- a/drivers/regulator/Makefile
    +++ b/drivers/regulator/Makefile
    @@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
    obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
    obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
    obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
    +obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o
    obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
    obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
    obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
    diff --git a/drivers/regulator/arizona-micsupp.c b/drivers/regulator/arizona-micsupp.c
    new file mode 100644
    index 0000000..97d85b0
    --- /dev/null
    +++ b/drivers/regulator/arizona-micsupp.c
    @@ -0,0 +1,184 @@
    +/*
    + * arizona-micsupp.c -- Microphone supply for Arizona devices
    + *
    + * Copyright 2012 Wolfson Microelectronics PLC.
    + *
    + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
    + *
    + * 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 >= 3300000)
    + 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,
    +};
    +
    +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,
    +
    + .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;
    +
    + 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 <broonie@opensource.wolfsonmicro.com>");
    +MODULE_DESCRIPTION("Arizona microphone supply driver");
    +MODULE_LICENSE("GPL");
    +MODULE_ALIAS("platform:arizona-micsupp");
    --
    1.7.10


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