[deliverable/linux.git] / drivers / regulator / max14577.c

/*
 * max14577.c - Regulator driver for the Maxim 14577/77836
 *
 * Copyright (C) 2013,2014 Samsung Electronics
 * Krzysztof Kozlowski <k.kozlowski@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.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/max14577.h>
#include <linux/mfd/max14577-private.h>
#include <linux/regulator/of_regulator.h>

static int max14577_reg_is_enabled(struct regulator_dev *rdev)
{
	int rid = rdev_get_id(rdev);
	struct regmap *rmap = rdev->regmap;
	u8 reg_data;

	switch (rid) {
	case MAX14577_CHARGER:
		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
			return 0;
		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
			return 0;
		/* MBCHOSTEN and CGMBC are on */
		return 1;
	default:
		return -EINVAL;
	}
}

static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
{
	u8 reg_data;
	struct regmap *rmap = rdev->regmap;
	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	const struct maxim_charger_current *limits =
		&maxim_charger_currents[max14577->dev_type];

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
		return -EINVAL;

	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);

	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
		return limits->min;

	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
			CHGCTRL4_MBCICHWRCH_SHIFT);
	return limits->high_start + reg_data * limits->high_step;
}

static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
		int min_uA, int max_uA)
{
	u8 reg_data;
	int ret;
	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	const struct maxim_charger_current *limits =
		&maxim_charger_currents[max14577->dev_type];

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
		return -EINVAL;

	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
	if (ret)
		return ret;

	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
			reg_data);
}

static struct regulator_ops max14577_safeout_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

static struct regulator_ops max14577_charger_ops = {
	.is_enabled		= max14577_reg_is_enabled,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_current_limit	= max14577_reg_get_current_limit,
	.set_current_limit	= max14577_reg_set_current_limit,
};

static const struct regulator_desc max14577_supported_regulators[] = {
	[MAX14577_SAFEOUT] = {
		.name		= "SAFEOUT",
		.id		= MAX14577_SAFEOUT,
		.ops		= &max14577_safeout_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= 1,
		.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
		.enable_reg	= MAX14577_REG_CONTROL2,
		.enable_mask	= CTRL2_SFOUTORD_MASK,
	},
	[MAX14577_CHARGER] = {
		.name		= "CHARGER",
		.id		= MAX14577_CHARGER,
		.ops		= &max14577_charger_ops,
		.type		= REGULATOR_CURRENT,
		.owner		= THIS_MODULE,
		.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2,
		.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK,
	},
};

static struct regulator_ops max77836_ldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	/* TODO: add .set_suspend_mode */
};

static const struct regulator_desc max77836_supported_regulators[] = {
	[MAX14577_SAFEOUT] = {
		.name		= "SAFEOUT",
		.id		= MAX14577_SAFEOUT,
		.ops		= &max14577_safeout_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= 1,
		.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
		.enable_reg	= MAX14577_REG_CONTROL2,
		.enable_mask	= CTRL2_SFOUTORD_MASK,
	},
	[MAX14577_CHARGER] = {
		.name		= "CHARGER",
		.id		= MAX14577_CHARGER,
		.ops		= &max14577_charger_ops,
		.type		= REGULATOR_CURRENT,
		.owner		= THIS_MODULE,
		.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2,
		.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK,
	},
	[MAX77836_LDO1] = {
		.name		= "LDO1",
		.id		= MAX77836_LDO1,
		.ops		= &max77836_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
		.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
		.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
		.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO1,
		.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK,
		.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO1,
		.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK,
	},
	[MAX77836_LDO2] = {
		.name		= "LDO2",
		.id		= MAX77836_LDO2,
		.ops		= &max77836_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
		.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
		.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
		.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO2,
		.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK,
		.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO2,
		.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK,
	},
};

#ifdef CONFIG_OF
static struct of_regulator_match max14577_regulator_matches[] = {
	{ .name	= "SAFEOUT", },
	{ .name = "CHARGER", },
};

static struct of_regulator_match max77836_regulator_matches[] = {
	{ .name	= "SAFEOUT", },
	{ .name = "CHARGER", },
	{ .name = "LDO1", },
	{ .name = "LDO2", },
};

static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
		enum maxim_device_type dev_type)
{
	int ret;
	struct device_node *np;
	struct of_regulator_match *regulator_matches;
	unsigned int regulator_matches_size;

	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	if (!np) {
		dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
		return -EINVAL;
	}

	switch (dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		regulator_matches = max77836_regulator_matches;
		regulator_matches_size = ARRAY_SIZE(max77836_regulator_matches);
		break;
	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		regulator_matches = max14577_regulator_matches;
		regulator_matches_size = ARRAY_SIZE(max14577_regulator_matches);
	}

	ret = of_regulator_match(&pdev->dev, np, regulator_matches,
			regulator_matches_size);
	if (ret < 0)
		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
	else
		ret = 0;

	of_node_put(np);

	return ret;
}

static inline struct regulator_init_data *match_init_data(int index,
		enum maxim_device_type dev_type)
{
	switch (dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		return max77836_regulator_matches[index].init_data;

	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		return max14577_regulator_matches[index].init_data;
	}
}

static inline struct device_node *match_of_node(int index,
		enum maxim_device_type dev_type)
{
	switch (dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		return max77836_regulator_matches[index].of_node;

	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		return max14577_regulator_matches[index].of_node;
	}
}
#else /* CONFIG_OF */
static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
		enum maxim_device_type dev_type)
{
	return 0;
}
static inline struct regulator_init_data *match_init_data(int index,
		enum maxim_device_type dev_type)
{
	return NULL;
}

static inline struct device_node *match_of_node(int index,
		enum maxim_device_type dev_type)
{
	return NULL;
}
#endif /* CONFIG_OF */

/**
 * Registers for regulators of max77836 use different I2C slave addresses so
 * different regmaps must be used for them.
 *
 * Returns proper regmap for accessing regulator passed by id.
 */
static struct regmap *max14577_get_regmap(struct max14577 *max14577,
		int reg_id)
{
	switch (max14577->dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		switch (reg_id) {
		case MAX77836_SAFEOUT ... MAX77836_CHARGER:
			return max14577->regmap;
		default:
			/* MAX77836_LDO1 ... MAX77836_LDO2 */
			return max14577->regmap_pmic;
		}

	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		return max14577->regmap;
	}
}

static int max14577_regulator_probe(struct platform_device *pdev)
{
	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	int i, ret;
	struct regulator_config config = {};
	const struct regulator_desc *supported_regulators;
	unsigned int supported_regulators_size;
	enum maxim_device_type dev_type = max14577->dev_type;

	ret = max14577_regulator_dt_parse_pdata(pdev, dev_type);
	if (ret)
		return ret;

	switch (dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		supported_regulators = max77836_supported_regulators;
		supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
		break;
	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		supported_regulators = max14577_supported_regulators;
		supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
	}

	config.dev = &pdev->dev;
	config.driver_data = max14577;

	for (i = 0; i < supported_regulators_size; i++) {
		struct regulator_dev *regulator;
		/*
		 * Index of supported_regulators[] is also the id and must
		 * match index of pdata->regulators[].
		 */
		if (pdata && pdata->regulators) {
			config.init_data = pdata->regulators[i].initdata;
			config.of_node = pdata->regulators[i].of_node;
		} else {
			config.init_data = match_init_data(i, dev_type);
			config.of_node = match_of_node(i, dev_type);
		}
		config.regmap = max14577_get_regmap(max14577,
				supported_regulators[i].id);

		regulator = devm_regulator_register(&pdev->dev,
				&supported_regulators[i], &config);
		if (IS_ERR(regulator)) {
			ret = PTR_ERR(regulator);
			dev_err(&pdev->dev,
					"Regulator init failed for %d/%s with error: %d\n",
					i, supported_regulators[i].name, ret);
			return ret;
		}
	}

	return ret;
}

static const struct platform_device_id max14577_regulator_id[] = {
	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
	{ }
};
MODULE_DEVICE_TABLE(platform, max14577_regulator_id);

static struct platform_driver max14577_regulator_driver = {
	.driver = {
		   .owner = THIS_MODULE,
		   .name = "max14577-regulator",
		   },
	.probe		= max14577_regulator_probe,
	.id_table	= max14577_regulator_id,
};

static int __init max14577_regulator_init(void)
{
	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);

	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
			(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
			  (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
			MAX77836_REGULATOR_LDO_VOLTAGE_MAX);

	return platform_driver_register(&max14577_regulator_driver);
}
subsys_initcall(max14577_regulator_init);

static void __exit max14577_regulator_exit(void)
{
	platform_driver_unregister(&max14577_regulator_driver);
}
module_exit(max14577_regulator_exit);

MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max14577-regulator");
Commit	Line	Data
b0902bbe	1	/*
8a82b408	2	* max14577.c - Regulator driver for the Maxim 14577/77836
b0902bbe	3	*
4d047d6c	4	* Copyright (C) 2013,2014 Samsung Electronics
b0902bbe KK	5	* Krzysztof Kozlowski <k.kozlowski@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/mfd/max14577.h>
	22	#include <linux/mfd/max14577-private.h>
	23	#include <linux/regulator/of_regulator.h>
	24
b0902bbe KK	25	static int max14577_reg_is_enabled(struct regulator_dev *rdev)
	26	{
	27	int rid = rdev_get_id(rdev);
	28	struct regmap *rmap = rdev->regmap;
	29	u8 reg_data;
	30
	31	switch (rid) {
	32	case MAX14577_CHARGER:
	33	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
	34	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
	35	return 0;
	36	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	37	if ((reg_data & STATUS3_CGMBC_MASK) == 0)
	38	return 0;
	39	/* MBCHOSTEN and CGMBC are on */
	40	return 1;
	41	default:
	42	return -EINVAL;
	43	}
	44	}
	45
	46	static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
	47	{
	48	u8 reg_data;
	49	struct regmap *rmap = rdev->regmap;
8a82b408 KK	50	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	51	const struct maxim_charger_current *limits =
	52	&maxim_charger_currents[max14577->dev_type];
b0902bbe KK	53
	54	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	55	return -EINVAL;
	56
	57	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
	58
	59	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
8a82b408	60	return limits->min;
b0902bbe KK	61
	62	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
	63	CHGCTRL4_MBCICHWRCH_SHIFT);
8a82b408	64	return limits->high_start + reg_data * limits->high_step;
b0902bbe KK	65	}
	66
	67	static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
	68	int min_uA, int max_uA)
	69	{
b0902bbe	70	u8 reg_data;
b8f139f6	71	int ret;
8a82b408 KK	72	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	73	const struct maxim_charger_current *limits =
	74	&maxim_charger_currents[max14577->dev_type];
b0902bbe KK	75
	76	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	77	return -EINVAL;
	78
b8f139f6 KK	79	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
	80	if (ret)
	81	return ret;
b0902bbe KK	82
	83	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
	84	CHGCTRL4_MBCICHWRCL_MASK \| CHGCTRL4_MBCICHWRCH_MASK,
	85	reg_data);
	86	}
	87
	88	static struct regulator_ops max14577_safeout_ops = {
	89	.is_enabled = regulator_is_enabled_regmap,
	90	.enable = regulator_enable_regmap,
	91	.disable = regulator_disable_regmap,
	92	.list_voltage = regulator_list_voltage_linear,
	93	};
	94
	95	static struct regulator_ops max14577_charger_ops = {
	96	.is_enabled = max14577_reg_is_enabled,
	97	.enable = regulator_enable_regmap,
	98	.disable = regulator_disable_regmap,
	99	.get_current_limit = max14577_reg_get_current_limit,
	100	.set_current_limit = max14577_reg_set_current_limit,
	101	};
	102
8a82b408	103	static const struct regulator_desc max14577_supported_regulators[] = {
b0902bbe KK	104	[MAX14577_SAFEOUT] = {
	105	.name = "SAFEOUT",
	106	.id = MAX14577_SAFEOUT,
	107	.ops = &max14577_safeout_ops,
	108	.type = REGULATOR_VOLTAGE,
	109	.owner = THIS_MODULE,
	110	.n_voltages = 1,
	111	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
	112	.enable_reg = MAX14577_REG_CONTROL2,
	113	.enable_mask = CTRL2_SFOUTORD_MASK,
	114	},
	115	[MAX14577_CHARGER] = {
	116	.name = "CHARGER",
	117	.id = MAX14577_CHARGER,
	118	.ops = &max14577_charger_ops,
	119	.type = REGULATOR_CURRENT,
	120	.owner = THIS_MODULE,
	121	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
	122	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
	123	},
	124	};
	125
8a82b408 KK	126	static struct regulator_ops max77836_ldo_ops = {
	127	.is_enabled = regulator_is_enabled_regmap,
	128	.enable = regulator_enable_regmap,
	129	.disable = regulator_disable_regmap,
	130	.list_voltage = regulator_list_voltage_linear,
	131	.map_voltage = regulator_map_voltage_linear,
	132	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	133	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	134	/* TODO: add .set_suspend_mode */
	135	};
	136
	137	static const struct regulator_desc max77836_supported_regulators[] = {
	138	[MAX14577_SAFEOUT] = {
	139	.name = "SAFEOUT",
	140	.id = MAX14577_SAFEOUT,
	141	.ops = &max14577_safeout_ops,
	142	.type = REGULATOR_VOLTAGE,
	143	.owner = THIS_MODULE,
	144	.n_voltages = 1,
	145	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
	146	.enable_reg = MAX14577_REG_CONTROL2,
	147	.enable_mask = CTRL2_SFOUTORD_MASK,
	148	},
	149	[MAX14577_CHARGER] = {
	150	.name = "CHARGER",
	151	.id = MAX14577_CHARGER,
	152	.ops = &max14577_charger_ops,
	153	.type = REGULATOR_CURRENT,
	154	.owner = THIS_MODULE,
	155	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
	156	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
	157	},
	158	[MAX77836_LDO1] = {
	159	.name = "LDO1",
	160	.id = MAX77836_LDO1,
	161	.ops = &max77836_ldo_ops,
	162	.type = REGULATOR_VOLTAGE,
	163	.owner = THIS_MODULE,
	164	.n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
	165	.min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
	166	.uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
	167	.enable_reg = MAX77836_LDO_REG_CNFG1_LDO1,
	168	.enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK,
	169	.vsel_reg = MAX77836_LDO_REG_CNFG1_LDO1,
	170	.vsel_mask = MAX77836_CNFG1_LDO_TV_MASK,
	171	},
	172	[MAX77836_LDO2] = {
	173	.name = "LDO2",
	174	.id = MAX77836_LDO2,
	175	.ops = &max77836_ldo_ops,
	176	.type = REGULATOR_VOLTAGE,
	177	.owner = THIS_MODULE,
	178	.n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
	179	.min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
	180	.uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
	181	.enable_reg = MAX77836_LDO_REG_CNFG1_LDO2,
	182	.enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK,
	183	.vsel_reg = MAX77836_LDO_REG_CNFG1_LDO2,
	184	.vsel_mask = MAX77836_CNFG1_LDO_TV_MASK,
	185	},
	186	};
	187
b0902bbe KK	188	#ifdef CONFIG_OF
	189	static struct of_regulator_match max14577_regulator_matches[] = {
	190	{ .name = "SAFEOUT", },
	191	{ .name = "CHARGER", },
	192	};
	193
8a82b408 KK	194	static struct of_regulator_match max77836_regulator_matches[] = {
	195	{ .name = "SAFEOUT", },
	196	{ .name = "CHARGER", },
	197	{ .name = "LDO1", },
	198	{ .name = "LDO2", },
	199	};
	200
	201	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
	202	enum maxim_device_type dev_type)
b0902bbe KK	203	{
	204	int ret;
	205	struct device_node *np;
8a82b408 KK	206	struct of_regulator_match *regulator_matches;
8a82b408 KK	207	unsigned int regulator_matches_size;
b0902bbe KK	208
	209	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	210	if (!np) {
	211	dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
	212	return -EINVAL;
	213	}
	214
8a82b408 KK	215	switch (dev_type) {
	216	case MAXIM_DEVICE_TYPE_MAX77836:
	217	regulator_matches = max77836_regulator_matches;
	218	regulator_matches_size = ARRAY_SIZE(max77836_regulator_matches);
	219	break;
	220	case MAXIM_DEVICE_TYPE_MAX14577:
	221	default:
	222	regulator_matches = max14577_regulator_matches;
	223	regulator_matches_size = ARRAY_SIZE(max14577_regulator_matches);
	224	}
	225
	226	ret = of_regulator_match(&pdev->dev, np, regulator_matches,
	227	regulator_matches_size);
08221fc4	228	if (ret < 0)
b0902bbe	229	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
08221fc4 KK	230	else
08221fc4 KK	231	ret = 0;
b0902bbe	232
667a6b7a KK	233	of_node_put(np);
	234
	235	return ret;
b0902bbe KK	236	}
b0902bbe KK	237
8a82b408 KK	238	static inline struct regulator_init_data *match_init_data(int index,
8a82b408 KK	239	enum maxim_device_type dev_type)
b0902bbe	240	{
8a82b408 KK	241	switch (dev_type) {
	242	case MAXIM_DEVICE_TYPE_MAX77836:
	243	return max77836_regulator_matches[index].init_data;
	244
	245	case MAXIM_DEVICE_TYPE_MAX14577:
	246	default:
	247	return max14577_regulator_matches[index].init_data;
	248	}
b0902bbe KK	249	}
b0902bbe KK	250
8a82b408 KK	251	static inline struct device_node *match_of_node(int index,
8a82b408 KK	252	enum maxim_device_type dev_type)
b0902bbe	253	{
8a82b408 KK	254	switch (dev_type) {
	255	case MAXIM_DEVICE_TYPE_MAX77836:
	256	return max77836_regulator_matches[index].of_node;
	257
	258	case MAXIM_DEVICE_TYPE_MAX14577:
	259	default:
	260	return max14577_regulator_matches[index].of_node;
	261	}
b0902bbe KK	262	}
b0902bbe KK	263	#else /* CONFIG_OF */
8a82b408 KK	264	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
8a82b408 KK	265	enum maxim_device_type dev_type)
b0902bbe KK	266	{
	267	return 0;
	268	}
8a82b408 KK	269	static inline struct regulator_init_data *match_init_data(int index,
8a82b408 KK	270	enum maxim_device_type dev_type)
b0902bbe KK	271	{
	272	return NULL;
	273	}
	274
8a82b408 KK	275	static inline struct device_node *match_of_node(int index,
8a82b408 KK	276	enum maxim_device_type dev_type)
b0902bbe KK	277	{
	278	return NULL;
	279	}
	280	#endif /* CONFIG_OF */
	281
8a82b408 KK	282	/**
	283	* Registers for regulators of max77836 use different I2C slave addresses so
	284	* different regmaps must be used for them.
	285	*
	286	* Returns proper regmap for accessing regulator passed by id.
	287	*/
	288	static struct regmap max14577_get_regmap(struct max14577 max14577,
	289	int reg_id)
	290	{
	291	switch (max14577->dev_type) {
	292	case MAXIM_DEVICE_TYPE_MAX77836:
	293	switch (reg_id) {
	294	case MAX77836_SAFEOUT ... MAX77836_CHARGER:
	295	return max14577->regmap;
	296	default:
	297	/* MAX77836_LDO1 ... MAX77836_LDO2 */
	298	return max14577->regmap_pmic;
	299	}
	300
	301	case MAXIM_DEVICE_TYPE_MAX14577:
	302	default:
	303	return max14577->regmap;
	304	}
	305	}
b0902bbe KK	306
	307	static int max14577_regulator_probe(struct platform_device *pdev)
	308	{
	309	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	310	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	311	int i, ret;
	312	struct regulator_config config = {};
8a82b408 KK	313	const struct regulator_desc *supported_regulators;
	314	unsigned int supported_regulators_size;
	315	enum maxim_device_type dev_type = max14577->dev_type;
b0902bbe	316
8a82b408	317	ret = max14577_regulator_dt_parse_pdata(pdev, dev_type);
b0902bbe KK	318	if (ret)
	319	return ret;
	320
8a82b408 KK	321	switch (dev_type) {
	322	case MAXIM_DEVICE_TYPE_MAX77836:
	323	supported_regulators = max77836_supported_regulators;
	324	supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
	325	break;
	326	case MAXIM_DEVICE_TYPE_MAX14577:
	327	default:
	328	supported_regulators = max14577_supported_regulators;
	329	supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
	330	}
	331
b0902bbe	332	config.dev = &pdev->dev;
8a82b408	333	config.driver_data = max14577;
b0902bbe	334
8a82b408	335	for (i = 0; i < supported_regulators_size; i++) {
b0902bbe KK	336	struct regulator_dev *regulator;
	337	/*
	338	* Index of supported_regulators[] is also the id and must
	339	* match index of pdata->regulators[].
	340	*/
	341	if (pdata && pdata->regulators) {
	342	config.init_data = pdata->regulators[i].initdata;
	343	config.of_node = pdata->regulators[i].of_node;
	344	} else {
8a82b408 KK	345	config.init_data = match_init_data(i, dev_type);
8a82b408 KK	346	config.of_node = match_of_node(i, dev_type);
b0902bbe	347	}
8a82b408 KK	348	config.regmap = max14577_get_regmap(max14577,
8a82b408 KK	349	supported_regulators[i].id);
b0902bbe KK	350
	351	regulator = devm_regulator_register(&pdev->dev,
	352	&supported_regulators[i], &config);
	353	if (IS_ERR(regulator)) {
	354	ret = PTR_ERR(regulator);
	355	dev_err(&pdev->dev,
8a82b408 KK	356	"Regulator init failed for %d/%s with error: %d\n",
8a82b408 KK	357	i, supported_regulators[i].name, ret);
b0902bbe KK	358	return ret;
	359	}
	360	}
	361
	362	return ret;
	363	}
	364
8a82b408 KK	365	static const struct platform_device_id max14577_regulator_id[] = {
	366	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
	367	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
	368	{ }
	369	};
	370	MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
	371
b0902bbe KK	372	static struct platform_driver max14577_regulator_driver = {
	373	.driver = {
	374	.owner = THIS_MODULE,
	375	.name = "max14577-regulator",
	376	},
8a82b408 KK	377	.probe = max14577_regulator_probe,
8a82b408 KK	378	.id_table = max14577_regulator_id,
b0902bbe KK	379	};
	380
	381	static int __init max14577_regulator_init(void)
	382	{
8a82b408 KK	383	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
	384	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
	385
	386	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
	387	(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
	388	(MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
	389	MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
b0902bbe KK	390
	391	return platform_driver_register(&max14577_regulator_driver);
	392	}
	393	subsys_initcall(max14577_regulator_init);
	394
	395	static void __exit max14577_regulator_exit(void)
	396	{
	397	platform_driver_unregister(&max14577_regulator_driver);
	398	}
	399	module_exit(max14577_regulator_exit);
	400
	401	MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
8a82b408	402	MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
b0902bbe	403	MODULE_LICENSE("GPL");
9f45a3dd	404	MODULE_ALIAS("platform:max14577-regulator");