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/*
* 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 > 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,
};
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;
/* 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 <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Arizona microphone supply driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:arizona-micsupp");
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