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Commit 9dfffb7a authored by Jaewon Kim's avatar Jaewon Kim Committed by Mark Brown
Browse files

regulator: max77843: Add max77843 regulator driver 



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: default avatarJaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: default avatarBeomho Seo <beomho.seo@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 97bf6af1

drivers/regulator/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/regulator/max77843.c

0 → 100644
+227 −0
Original line number Diff line number Diff line 
/*

 * 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");