drivers/regulator/max77693.c - linux - Git at Google

 /*
  * max77693.c - Regulator driver for the Maxim 77693
  *
  * Copyright (C) 2013 Samsung Electronics
  * Jonghwa Lee <jonghwa3.lee@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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * This driver is based on max77686.c
  */

 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/export.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/mfd/max77693.h>
 #include <linux/mfd/max77693-private.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regmap.h>

 #define CHGIN_ILIM_STEP_20mA			20000

 /* CHARGER regulator ops */
 /* CHARGER regulator uses two bits for enabling */
 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
 {
 	int ret;
 	unsigned int val;

 	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
 	if (ret)
 		return ret;

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

 /*
  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  * 0x00, 0x01, 0x2, 0x03	= 60 mA
  * 0x04 ~ 0x7E			= (60 + (X - 3) * 20) mA
  */
 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
 {
 	unsigned int chg_min_uA = rdev->constraints->min_uA;
 	unsigned int chg_max_uA = rdev->constraints->max_uA;
 	unsigned int reg, sel;
 	unsigned int val;
 	int ret;

 	ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, &reg);
 	if (ret < 0)
 		return ret;

 	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;

 	/* the first four codes for charger current are all 60mA */
 	if (sel <= 3)
 		sel = 0;
 	else
 		sel -= 3;

 	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
 	if (val > chg_max_uA)
 		return -EINVAL;

 	return val;
 }

 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
 						int min_uA, int max_uA)
 {
 	unsigned int chg_min_uA = rdev->constraints->min_uA;
 	int sel = 0;

 	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
 		sel++;

 	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
 		return -EINVAL;

 	/* the first four codes for charger current are all 60mA */
 	sel += 3;

 	return regmap_write(rdev->regmap,
 				MAX77693_CHG_REG_CHG_CNFG_09, sel);
 }
 /* end of CHARGER regulator ops */

 static const unsigned int max77693_safeout_table[] = {
 	4850000,
 	4900000,
 	4950000,
 	3300000,
 };

 static struct regulator_ops max77693_safeout_ops = {
 	.list_voltage		= regulator_list_voltage_table,
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 };

 static struct regulator_ops max77693_charger_ops = {
 	.is_enabled		= max77693_chg_is_enabled,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_current_limit	= max77693_chg_get_current_limit,
 	.set_current_limit	= max77693_chg_set_current_limit,
 };

 #define regulator_desc_esafeout(_num)	{			\
 	.name		= "ESAFEOUT"#_num,			\
 	.id		= MAX77693_ESAFEOUT##_num,		\
 	.n_voltages	= 4,					\
 	.ops		= &max77693_safeout_ops,		\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.volt_table	= max77693_safeout_table,		\
 	.vsel_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
 	.vsel_mask	= SAFEOUT_CTRL_SAFEOUT##_num##_MASK,	\
 	.enable_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
 	.enable_mask	= SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK ,	\
 }

 static const struct regulator_desc regulators[] = {
 	regulator_desc_esafeout(1),
 	regulator_desc_esafeout(2),
 	{
 		.name = "CHARGER",
 		.id = MAX77693_CHARGER,
 		.ops = &max77693_charger_ops,
 		.type = REGULATOR_CURRENT,
 		.owner = THIS_MODULE,
 		.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 		.enable_mask = CHG_CNFG_00_CHG_MASK |
 				CHG_CNFG_00_BUCK_MASK,
 	},
 };

 #ifdef CONFIG_OF
 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 					struct max77693_regulator_data **rdata)
 {
 	struct device_node *np;
 	struct of_regulator_match *rmatch;
 	struct max77693_regulator_data *tmp;
 	int i, matched = 0;

 	np = of_get_child_by_name(dev->parent->of_node, "regulators");
 	if (!np)
 		return -EINVAL;

 	rmatch = devm_kzalloc(dev,
 		 sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
 	if (!rmatch) {
 		of_node_put(np);
 		return -ENOMEM;
 	}

 	for (i = 0; i < ARRAY_SIZE(regulators); i++)
 		rmatch[i].name = regulators[i].name;

 	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
 	of_node_put(np);
 	if (matched <= 0)
 		return matched;
 	*rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
 	if (!(*rdata))
 		return -ENOMEM;

 	tmp = *rdata;

 	for (i = 0; i < matched; i++) {
 		tmp->initdata = rmatch[i].init_data;
 		tmp->of_node = rmatch[i].of_node;
 		tmp->id = regulators[i].id;
 		tmp++;
 	}

 	return matched;
 }
 #else
 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 					struct max77693_regulator_data **rdata)
 {
 	return 0;
 }
 #endif /* CONFIG_OF */

 static int max77693_pmic_init_rdata(struct device *dev,
 				    struct max77693_regulator_data **rdata)
 {
 	struct max77693_platform_data *pdata;
 	int num_regulators = 0;

 	pdata = dev_get_platdata(dev->parent);
 	if (pdata) {
 		*rdata = pdata->regulators;
 		num_regulators = pdata->num_regulators;
 	}

 	if (!(*rdata) && dev->parent->of_node)
 		num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);

 	return num_regulators;
 }

 static int max77693_pmic_probe(struct platform_device *pdev)
 {
 	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct max77693_regulator_data *rdata = NULL;
 	int num_rdata, i;
 	struct regulator_config config = { };

 	num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
 	if (!rdata || num_rdata <= 0) {
 		dev_err(&pdev->dev, "No init data supplied.\n");
 		return -ENODEV;
 	}

 	config.dev = &pdev->dev;
 	config.regmap = iodev->regmap;

 	for (i = 0; i < num_rdata; i++) {
 		int id = rdata[i].id;
 		struct regulator_dev *rdev;

 		config.init_data = rdata[i].initdata;
 		config.of_node = rdata[i].of_node;

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

 	return 0;
 }

 static const struct platform_device_id max77693_pmic_id[] = {
 	{"max77693-pmic", 0},
 	{},
 };

 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);

 static struct platform_driver max77693_pmic_driver = {
 	.driver = {
 		   .name = "max77693-pmic",
 		   .owner = THIS_MODULE,
 		   },
 	.probe = max77693_pmic_probe,
 	.id_table = max77693_pmic_id,
 };

 module_platform_driver(max77693_pmic_driver);

 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 MODULE_LICENSE("GPL");
	/*
	* max77693.c - Regulator driver for the Maxim 77693
	*
	* Copyright (C) 2013 Samsung Electronics
	* Jonghwa Lee <jonghwa3.lee@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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* This driver is based on max77686.c
	*/

	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/module.h>
	#include <linux/export.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/mfd/max77693.h>
	#include <linux/mfd/max77693-private.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regmap.h>

	#define CHGIN_ILIM_STEP_20mA 20000

	/* CHARGER regulator ops */
	/* CHARGER regulator uses two bits for enabling */
	static int max77693_chg_is_enabled(struct regulator_dev *rdev)
	{
	int ret;
	unsigned int val;

	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
	if (ret)
	return ret;

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

	/*
	* CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
	* 0x00, 0x01, 0x2, 0x03 = 60 mA
	* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
	*/
	static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
	{
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	unsigned int chg_max_uA = rdev->constraints->max_uA;
	unsigned int reg, sel;
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, &reg);
	if (ret < 0)
	return ret;

	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;

	/* the first four codes for charger current are all 60mA */
	if (sel <= 3)
	sel = 0;
	else
	sel -= 3;

	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
	if (val > chg_max_uA)
	return -EINVAL;

	return val;
	}

	static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
	int min_uA, int max_uA)
	{
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	int sel = 0;

	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
	sel++;

	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
	return -EINVAL;

	/* the first four codes for charger current are all 60mA */
	sel += 3;

	return regmap_write(rdev->regmap,
	MAX77693_CHG_REG_CHG_CNFG_09, sel);
	}
	/* end of CHARGER regulator ops */

	static const unsigned int max77693_safeout_table[] = {
	4850000,
	4900000,
	4950000,
	3300000,
	};

	static struct regulator_ops max77693_safeout_ops = {
	.list_voltage = regulator_list_voltage_table,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	};

	static struct regulator_ops max77693_charger_ops = {
	.is_enabled = max77693_chg_is_enabled,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_current_limit = max77693_chg_get_current_limit,
	.set_current_limit = max77693_chg_set_current_limit,
	};

	#define regulator_desc_esafeout(_num) { \
	.name = "ESAFEOUT"#_num, \
	.id = MAX77693_ESAFEOUT##_num, \
	.n_voltages = 4, \
	.ops = &max77693_safeout_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.volt_table = max77693_safeout_table, \
	.vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
	.vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
	.enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
	.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
	}

	static const struct regulator_desc regulators[] = {
	regulator_desc_esafeout(1),
	regulator_desc_esafeout(2),
	{
	.name = "CHARGER",
	.id = MAX77693_CHARGER,
	.ops = &max77693_charger_ops,
	.type = REGULATOR_CURRENT,
	.owner = THIS_MODULE,
	.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
	.enable_mask = CHG_CNFG_00_CHG_MASK \|
	CHG_CNFG_00_BUCK_MASK,
	},
	};

	#ifdef CONFIG_OF
	static int max77693_pmic_dt_parse_rdata(struct device *dev,
	struct max77693_regulator_data **rdata)
	{
	struct device_node *np;
	struct of_regulator_match *rmatch;
	struct max77693_regulator_data *tmp;
	int i, matched = 0;

	np = of_get_child_by_name(dev->parent->of_node, "regulators");
	if (!np)
	return -EINVAL;

	rmatch = devm_kzalloc(dev,
	sizeof(rmatch) ARRAY_SIZE(regulators), GFP_KERNEL);
	if (!rmatch) {
	of_node_put(np);
	return -ENOMEM;
	}

	for (i = 0; i < ARRAY_SIZE(regulators); i++)
	rmatch[i].name = regulators[i].name;

	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
	of_node_put(np);
	if (matched <= 0)
	return matched;
	rdata = devm_kzalloc(dev, sizeof(rdata) matched, GFP_KERNEL);
	if (!(*rdata))
	return -ENOMEM;

	tmp = *rdata;

	for (i = 0; i < matched; i++) {
	tmp->initdata = rmatch[i].init_data;
	tmp->of_node = rmatch[i].of_node;
	tmp->id = regulators[i].id;
	tmp++;
	}

	return matched;
	}
	#else
	static int max77693_pmic_dt_parse_rdata(struct device *dev,
	struct max77693_regulator_data **rdata)
	{
	return 0;
	}
	#endif /* CONFIG_OF */

	static int max77693_pmic_init_rdata(struct device *dev,
	struct max77693_regulator_data **rdata)
	{
	struct max77693_platform_data *pdata;
	int num_regulators = 0;

	pdata = dev_get_platdata(dev->parent);
	if (pdata) {
	*rdata = pdata->regulators;
	num_regulators = pdata->num_regulators;
	}

	if (!(*rdata) && dev->parent->of_node)
	num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);

	return num_regulators;
	}

	static int max77693_pmic_probe(struct platform_device *pdev)
	{
	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max77693_regulator_data *rdata = NULL;
	int num_rdata, i;
	struct regulator_config config = { };

	num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
	if (!rdata \|\| num_rdata <= 0) {
	dev_err(&pdev->dev, "No init data supplied.\n");
	return -ENODEV;
	}

	config.dev = &pdev->dev;
	config.regmap = iodev->regmap;

	for (i = 0; i < num_rdata; i++) {
	int id = rdata[i].id;
	struct regulator_dev *rdev;

	config.init_data = rdata[i].initdata;
	config.of_node = rdata[i].of_node;

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

	return 0;
	}

	static const struct platform_device_id max77693_pmic_id[] = {
	{"max77693-pmic", 0},
	{},
	};

	MODULE_DEVICE_TABLE(platform, max77693_pmic_id);

	static struct platform_driver max77693_pmic_driver = {
	.driver = {
	.name = "max77693-pmic",
	.owner = THIS_MODULE,
	},
	.probe = max77693_pmic_probe,
	.id_table = max77693_pmic_id,
	};

	module_platform_driver(max77693_pmic_driver);

	MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
	MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
	MODULE_LICENSE("GPL");