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regulator: max77843: Add max77843 regulator driver
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This patch adds new regulator driver to support max77843
MFD(Multi Function Device) chip`s regulators.
The Max77843 has two voltage regulators for USB safeout.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Jaewon Kim authored and Mark Brown committed Feb 5, 2015
1 parent 97bf6af commit 9dfffb7
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8 changes: 8 additions & 0 deletions drivers/regulator/Kconfig
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Expand Up @@ -414,6 +414,14 @@ config REGULATOR_MAX77802
Exynos5420/Exynos5800 SoCs to control various voltages.
It includes support for control of voltage and ramp speed.

config REGULATOR_MAX77843
tristate "Maxim 77843 regulator"
depends on MFD_MAX77843
help
This driver controls a Maxim 77843 regulator.
The regulator include two 'SAFEOUT' for USB(Universal Serial Bus)
This is suitable for Exynos5433 SoC chips.

config REGULATOR_MC13XXX_CORE
tristate

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1 change: 1 addition & 0 deletions drivers/regulator/Makefile
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Expand Up @@ -55,6 +55,7 @@ obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
obj-$(CONFIG_REGULATOR_MAX77843) += max77843.o
obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
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227 changes: 227 additions & 0 deletions drivers/regulator/max77843.c
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/*
* max77843.c - Regulator driver for the Maxim MAX77843
*
* Copyright (C) 2015 Samsung Electronics
* Author: Jaewon Kim <jaewon02.kim@samsung.com>
* Author: Beomho Seo <beomho.seo@samsung.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/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77843-private.h>
#include <linux/regulator/of_regulator.h>

enum max77843_regulator_type {
MAX77843_SAFEOUT1 = 0,
MAX77843_SAFEOUT2,
MAX77843_CHARGER,

MAX77843_NUM,
};

static const unsigned int max77843_safeout_voltage_table[] = {
4850000,
4900000,
4950000,
3300000,
};

static int max77843_reg_is_enabled(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev->regmap;
int ret;
unsigned int reg;

ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
if (ret) {
dev_err(&rdev->dev, "Fialed to read charger register\n");
return ret;
}

return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
}

static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev->regmap;
unsigned int chg_min_uA = rdev->constraints->min_uA;
unsigned int chg_max_uA = rdev->constraints->max_uA;
unsigned int val;
int ret;
unsigned int reg, sel;

ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
if (ret) {
dev_err(&rdev->dev, "Failed to read charger register\n");
return ret;
}

sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;

if (sel < 0x03)
sel = 0;
else
sel -= 2;

val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
if (val > chg_max_uA)
return -EINVAL;

return val;
}

static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
struct regmap *regmap = rdev->regmap;
unsigned int chg_min_uA = rdev->constraints->min_uA;
int sel = 0;

while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
sel++;

if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
return -EINVAL;

sel += 2;

return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
}

static struct regulator_ops max77843_charger_ops = {
.is_enabled = max77843_reg_is_enabled,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_current_limit = max77843_reg_get_current_limit,
.set_current_limit = max77843_reg_set_current_limit,
};

static struct regulator_ops max77843_regulator_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_table,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc max77843_supported_regulators[] = {
[MAX77843_SAFEOUT1] = {
.name = "SAFEOUT1",
.id = MAX77843_SAFEOUT1,
.ops = &max77843_regulator_ops,
.of_match = of_match_ptr("SAFEOUT1"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
.volt_table = max77843_safeout_voltage_table,
.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
},
[MAX77843_SAFEOUT2] = {
.name = "SAFEOUT2",
.id = MAX77843_SAFEOUT2,
.ops = &max77843_regulator_ops,
.of_match = of_match_ptr("SAFEOUT2"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
.volt_table = max77843_safeout_voltage_table,
.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
},
[MAX77843_CHARGER] = {
.name = "CHARGER",
.id = MAX77843_CHARGER,
.ops = &max77843_charger_ops,
.of_match = of_match_ptr("CHARGER"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
.enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
.enable_mask = MAX77843_CHG_MASK,
},
};

static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
{
switch (reg_id) {
case MAX77843_SAFEOUT1:
case MAX77843_SAFEOUT2:
return max77843->regmap;
case MAX77843_CHARGER:
return max77843->regmap_chg;
default:
return max77843->regmap;
}
}

static int max77843_regulator_probe(struct platform_device *pdev)
{
struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = {};
int i;

config.dev = max77843->dev;
config.driver_data = max77843;

for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
struct regulator_dev *regulator;

config.regmap = max77843_get_regmap(max77843,
max77843_supported_regulators[i].id);

regulator = devm_regulator_register(&pdev->dev,
&max77843_supported_regulators[i], &config);
if (IS_ERR(regulator)) {
dev_err(&pdev->dev,
"Failed to regiser regulator-%d\n", i);
return PTR_ERR(regulator);
}
}

return 0;
}

static const struct platform_device_id max77843_regulator_id[] = {
{ "max77843-regulator", },
{ /* sentinel */ },
};

static struct platform_driver max77843_regulator_driver = {
.driver = {
.name = "max77843-regulator",
},
.probe = max77843_regulator_probe,
.id_table = max77843_regulator_id,
};

static int __init max77843_regulator_init(void)
{
return platform_driver_register(&max77843_regulator_driver);
}
subsys_initcall(max77843_regulator_init);

static void __exit max77843_regulator_exit(void)
{
platform_driver_unregister(&max77843_regulator_driver);
}
module_exit(max77843_regulator_exit);

MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
MODULE_LICENSE("GPL");

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