[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>

/*
 * Valid limits of current for max14577 and max77836 chargers.
 * They must correspond to MBCICHWRCL and MBCICHWRCH fields in CHGCTRL4
 * register for given chipset.
 */
struct maxim_charger_current {
	/* Minimal current, set in CHGCTRL4/MBCICHWRCL, uA */
	unsigned int min;
	/*
	 * Minimal current when high setting is active,
	 * set in CHGCTRL4/MBCICHWRCH, uA
	 */
	unsigned int high_start;
	/* Value of one step in high setting, uA */
	unsigned int high_step;
	/* Maximum current of high setting, uA */
	unsigned int max;
};

/* Table of valid charger currents for different Maxim chipsets */
static const struct maxim_charger_current maxim_charger_currents[] = {
	[MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
	[MAXIM_DEVICE_TYPE_MAX14577] = {
		.min		= MAX14577_REGULATOR_CURRENT_LIMIT_MIN,
		.high_start	= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START,
		.high_step	= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP,
		.max		= MAX14577_REGULATOR_CURRENT_LIMIT_MAX,
	},
	[MAXIM_DEVICE_TYPE_MAX77836] = {
		.min		= MAX77836_REGULATOR_CURRENT_LIMIT_MIN,
		.high_start	= MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START,
		.high_step	= MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP,
		.max		= MAX77836_REGULATOR_CURRENT_LIMIT_MAX,
	},
};

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)
{
	int i, current_bits = 0xf;
	u8 reg_data;
	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;

	if (min_uA > limits->max || max_uA < limits->min)
		return -EINVAL;

	if (max_uA < limits->high_start) {
		/*
		 * Less than high_start,
		 * so set the minimal current (turn only Low Bit off)
		 */
		u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
		return max14577_update_reg(rdev->regmap,
				MAX14577_CHG_REG_CHG_CTRL4,
				CHGCTRL4_MBCICHWRCL_MASK, reg_data);
	}

	/*
	 * max_uA is in range: <high_start, inifinite>, so search for
	 * valid current starting from maximum current.
	 */
	for (i = limits->max; i >= limits->high_start; i -= limits->high_step) {
		if (i <= max_uA)
			break;
		current_bits--;
	}
	BUG_ON(current_bits < 0); /* Cannot happen */

	/* Turn Low Bit on (use range high_start-max)... */
	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
	/* and set proper High Bits */
	reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;

	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)
{
	/* Check for valid values for charger */
	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
			MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
			MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
	BUILD_BUG_ON(MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START +
			MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
			MAX77836_REGULATOR_CURRENT_LIMIT_MAX);
	/* Valid charger current values must be provided for each chipset */
	BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);

	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
8a82b408 KK	25	/*
	26	* Valid limits of current for max14577 and max77836 chargers.
	27	* They must correspond to MBCICHWRCL and MBCICHWRCH fields in CHGCTRL4
	28	* register for given chipset.
	29	*/
	30	struct maxim_charger_current {
	31	/* Minimal current, set in CHGCTRL4/MBCICHWRCL, uA */
	32	unsigned int min;
	33	/*
	34	* Minimal current when high setting is active,
	35	* set in CHGCTRL4/MBCICHWRCH, uA
	36	*/
	37	unsigned int high_start;
	38	/* Value of one step in high setting, uA */
	39	unsigned int high_step;
	40	/* Maximum current of high setting, uA */
	41	unsigned int max;
	42	};
	43
	44	/* Table of valid charger currents for different Maxim chipsets */
	45	static const struct maxim_charger_current maxim_charger_currents[] = {
	46	[MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
	47	[MAXIM_DEVICE_TYPE_MAX14577] = {
	48	.min = MAX14577_REGULATOR_CURRENT_LIMIT_MIN,
	49	.high_start = MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START,
	50	.high_step = MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP,
	51	.max = MAX14577_REGULATOR_CURRENT_LIMIT_MAX,
	52	},
	53	[MAXIM_DEVICE_TYPE_MAX77836] = {
	54	.min = MAX77836_REGULATOR_CURRENT_LIMIT_MIN,
	55	.high_start = MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START,
	56	.high_step = MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP,
	57	.max = MAX77836_REGULATOR_CURRENT_LIMIT_MAX,
	58	},
	59	};
	60
b0902bbe KK	61	static int max14577_reg_is_enabled(struct regulator_dev *rdev)
	62	{
	63	int rid = rdev_get_id(rdev);
	64	struct regmap *rmap = rdev->regmap;
	65	u8 reg_data;
	66
	67	switch (rid) {
	68	case MAX14577_CHARGER:
	69	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
	70	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
	71	return 0;
	72	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	73	if ((reg_data & STATUS3_CGMBC_MASK) == 0)
	74	return 0;
	75	/* MBCHOSTEN and CGMBC are on */
	76	return 1;
	77	default:
	78	return -EINVAL;
	79	}
	80	}
	81
	82	static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
	83	{
	84	u8 reg_data;
	85	struct regmap *rmap = rdev->regmap;
8a82b408 KK	86	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	87	const struct maxim_charger_current *limits =
	88	&maxim_charger_currents[max14577->dev_type];
b0902bbe KK	89
	90	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	91	return -EINVAL;
	92
	93	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
	94
	95	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
8a82b408	96	return limits->min;
b0902bbe KK	97
	98	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
	99	CHGCTRL4_MBCICHWRCH_SHIFT);
8a82b408	100	return limits->high_start + reg_data * limits->high_step;
b0902bbe KK	101	}
	102
	103	static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
	104	int min_uA, int max_uA)
	105	{
	106	int i, current_bits = 0xf;
	107	u8 reg_data;
8a82b408 KK	108	struct max14577 *max14577 = rdev_get_drvdata(rdev);
	109	const struct maxim_charger_current *limits =
	110	&maxim_charger_currents[max14577->dev_type];
b0902bbe KK	111
	112	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	113	return -EINVAL;
	114
8a82b408	115	if (min_uA > limits->max \|\| max_uA < limits->min)
b0902bbe KK	116	return -EINVAL;
b0902bbe KK	117
8a82b408 KK	118	if (max_uA < limits->high_start) {
	119	/*
	120	* Less than high_start,
	121	* so set the minimal current (turn only Low Bit off)
	122	*/
b0902bbe KK	123	u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
	124	return max14577_update_reg(rdev->regmap,
	125	MAX14577_CHG_REG_CHG_CTRL4,
	126	CHGCTRL4_MBCICHWRCL_MASK, reg_data);
	127	}
	128
8a82b408 KK	129	/*
	130	* max_uA is in range: <high_start, inifinite>, so search for
	131	* valid current starting from maximum current.
	132	*/
	133	for (i = limits->max; i >= limits->high_start; i -= limits->high_step) {
b0902bbe KK	134	if (i <= max_uA)
	135	break;
	136	current_bits--;
	137	}
	138	BUG_ON(current_bits < 0); /* Cannot happen */
8a82b408 KK	139
8a82b408 KK	140	/* Turn Low Bit on (use range high_start-max)... */
b0902bbe KK	141	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
	142	/* and set proper High Bits */
	143	reg_data \|= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
	144
	145	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
	146	CHGCTRL4_MBCICHWRCL_MASK \| CHGCTRL4_MBCICHWRCH_MASK,
	147	reg_data);
	148	}
	149
	150	static struct regulator_ops max14577_safeout_ops = {
	151	.is_enabled = regulator_is_enabled_regmap,
	152	.enable = regulator_enable_regmap,
	153	.disable = regulator_disable_regmap,
	154	.list_voltage = regulator_list_voltage_linear,
	155	};
	156
	157	static struct regulator_ops max14577_charger_ops = {
	158	.is_enabled = max14577_reg_is_enabled,
	159	.enable = regulator_enable_regmap,
	160	.disable = regulator_disable_regmap,
	161	.get_current_limit = max14577_reg_get_current_limit,
	162	.set_current_limit = max14577_reg_set_current_limit,
	163	};
	164
8a82b408	165	static const struct regulator_desc max14577_supported_regulators[] = {
b0902bbe KK	166	[MAX14577_SAFEOUT] = {
	167	.name = "SAFEOUT",
	168	.id = MAX14577_SAFEOUT,
	169	.ops = &max14577_safeout_ops,
	170	.type = REGULATOR_VOLTAGE,
	171	.owner = THIS_MODULE,
	172	.n_voltages = 1,
	173	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
	174	.enable_reg = MAX14577_REG_CONTROL2,
	175	.enable_mask = CTRL2_SFOUTORD_MASK,
	176	},
	177	[MAX14577_CHARGER] = {
	178	.name = "CHARGER",
	179	.id = MAX14577_CHARGER,
	180	.ops = &max14577_charger_ops,
	181	.type = REGULATOR_CURRENT,
	182	.owner = THIS_MODULE,
	183	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
	184	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
	185	},
	186	};
	187
8a82b408 KK	188	static struct regulator_ops max77836_ldo_ops = {
	189	.is_enabled = regulator_is_enabled_regmap,
	190	.enable = regulator_enable_regmap,
	191	.disable = regulator_disable_regmap,
	192	.list_voltage = regulator_list_voltage_linear,
	193	.map_voltage = regulator_map_voltage_linear,
	194	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	195	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	196	/* TODO: add .set_suspend_mode */
	197	};
	198
	199	static const struct regulator_desc max77836_supported_regulators[] = {
	200	[MAX14577_SAFEOUT] = {
	201	.name = "SAFEOUT",
	202	.id = MAX14577_SAFEOUT,
	203	.ops = &max14577_safeout_ops,
	204	.type = REGULATOR_VOLTAGE,
	205	.owner = THIS_MODULE,
	206	.n_voltages = 1,
	207	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
	208	.enable_reg = MAX14577_REG_CONTROL2,
	209	.enable_mask = CTRL2_SFOUTORD_MASK,
	210	},
	211	[MAX14577_CHARGER] = {
	212	.name = "CHARGER",
	213	.id = MAX14577_CHARGER,
	214	.ops = &max14577_charger_ops,
	215	.type = REGULATOR_CURRENT,
	216	.owner = THIS_MODULE,
	217	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
	218	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
	219	},
	220	[MAX77836_LDO1] = {
	221	.name = "LDO1",
	222	.id = MAX77836_LDO1,
	223	.ops = &max77836_ldo_ops,
	224	.type = REGULATOR_VOLTAGE,
	225	.owner = THIS_MODULE,
	226	.n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
	227	.min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
	228	.uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
	229	.enable_reg = MAX77836_LDO_REG_CNFG1_LDO1,
	230	.enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK,
	231	.vsel_reg = MAX77836_LDO_REG_CNFG1_LDO1,
	232	.vsel_mask = MAX77836_CNFG1_LDO_TV_MASK,
	233	},
	234	[MAX77836_LDO2] = {
	235	.name = "LDO2",
	236	.id = MAX77836_LDO2,
	237	.ops = &max77836_ldo_ops,
	238	.type = REGULATOR_VOLTAGE,
	239	.owner = THIS_MODULE,
	240	.n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
	241	.min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
	242	.uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
	243	.enable_reg = MAX77836_LDO_REG_CNFG1_LDO2,
	244	.enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK,
	245	.vsel_reg = MAX77836_LDO_REG_CNFG1_LDO2,
	246	.vsel_mask = MAX77836_CNFG1_LDO_TV_MASK,
	247	},
	248	};
	249
b0902bbe KK	250	#ifdef CONFIG_OF
	251	static struct of_regulator_match max14577_regulator_matches[] = {
	252	{ .name = "SAFEOUT", },
	253	{ .name = "CHARGER", },
	254	};
	255
8a82b408 KK	256	static struct of_regulator_match max77836_regulator_matches[] = {
	257	{ .name = "SAFEOUT", },
	258	{ .name = "CHARGER", },
	259	{ .name = "LDO1", },
	260	{ .name = "LDO2", },
	261	};
	262
	263	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
	264	enum maxim_device_type dev_type)
b0902bbe KK	265	{
	266	int ret;
	267	struct device_node *np;
8a82b408 KK	268	struct of_regulator_match *regulator_matches;
8a82b408 KK	269	unsigned int regulator_matches_size;
b0902bbe KK	270
	271	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	272	if (!np) {
	273	dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
	274	return -EINVAL;
	275	}
	276
8a82b408 KK	277	switch (dev_type) {
	278	case MAXIM_DEVICE_TYPE_MAX77836:
	279	regulator_matches = max77836_regulator_matches;
	280	regulator_matches_size = ARRAY_SIZE(max77836_regulator_matches);
	281	break;
	282	case MAXIM_DEVICE_TYPE_MAX14577:
	283	default:
	284	regulator_matches = max14577_regulator_matches;
	285	regulator_matches_size = ARRAY_SIZE(max14577_regulator_matches);
	286	}
	287
	288	ret = of_regulator_match(&pdev->dev, np, regulator_matches,
	289	regulator_matches_size);
08221fc4	290	if (ret < 0)
b0902bbe	291	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
08221fc4 KK	292	else
08221fc4 KK	293	ret = 0;
b0902bbe	294
667a6b7a KK	295	of_node_put(np);
	296
	297	return ret;
b0902bbe KK	298	}
b0902bbe KK	299
8a82b408 KK	300	static inline struct regulator_init_data *match_init_data(int index,
8a82b408 KK	301	enum maxim_device_type dev_type)
b0902bbe	302	{
8a82b408 KK	303	switch (dev_type) {
	304	case MAXIM_DEVICE_TYPE_MAX77836:
	305	return max77836_regulator_matches[index].init_data;
	306
	307	case MAXIM_DEVICE_TYPE_MAX14577:
	308	default:
	309	return max14577_regulator_matches[index].init_data;
	310	}
b0902bbe KK	311	}
b0902bbe KK	312
8a82b408 KK	313	static inline struct device_node *match_of_node(int index,
8a82b408 KK	314	enum maxim_device_type dev_type)
b0902bbe	315	{
8a82b408 KK	316	switch (dev_type) {
	317	case MAXIM_DEVICE_TYPE_MAX77836:
	318	return max77836_regulator_matches[index].of_node;
	319
	320	case MAXIM_DEVICE_TYPE_MAX14577:
	321	default:
	322	return max14577_regulator_matches[index].of_node;
	323	}
b0902bbe KK	324	}
b0902bbe KK	325	#else /* CONFIG_OF */
8a82b408 KK	326	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
8a82b408 KK	327	enum maxim_device_type dev_type)
b0902bbe KK	328	{
	329	return 0;
	330	}
8a82b408 KK	331	static inline struct regulator_init_data *match_init_data(int index,
8a82b408 KK	332	enum maxim_device_type dev_type)
b0902bbe KK	333	{
	334	return NULL;
	335	}
	336
8a82b408 KK	337	static inline struct device_node *match_of_node(int index,
8a82b408 KK	338	enum maxim_device_type dev_type)
b0902bbe KK	339	{
	340	return NULL;
	341	}
	342	#endif /* CONFIG_OF */
	343
8a82b408 KK	344	/**
	345	* Registers for regulators of max77836 use different I2C slave addresses so
	346	* different regmaps must be used for them.
	347	*
	348	* Returns proper regmap for accessing regulator passed by id.
	349	*/
	350	static struct regmap max14577_get_regmap(struct max14577 max14577,
	351	int reg_id)
	352	{
	353	switch (max14577->dev_type) {
	354	case MAXIM_DEVICE_TYPE_MAX77836:
	355	switch (reg_id) {
	356	case MAX77836_SAFEOUT ... MAX77836_CHARGER:
	357	return max14577->regmap;
	358	default:
	359	/* MAX77836_LDO1 ... MAX77836_LDO2 */
	360	return max14577->regmap_pmic;
	361	}
	362
	363	case MAXIM_DEVICE_TYPE_MAX14577:
	364	default:
	365	return max14577->regmap;
	366	}
	367	}
b0902bbe KK	368
	369	static int max14577_regulator_probe(struct platform_device *pdev)
	370	{
	371	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	372	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	373	int i, ret;
	374	struct regulator_config config = {};
8a82b408 KK	375	const struct regulator_desc *supported_regulators;
	376	unsigned int supported_regulators_size;
	377	enum maxim_device_type dev_type = max14577->dev_type;
b0902bbe	378
8a82b408	379	ret = max14577_regulator_dt_parse_pdata(pdev, dev_type);
b0902bbe KK	380	if (ret)
	381	return ret;
	382
8a82b408 KK	383	switch (dev_type) {
	384	case MAXIM_DEVICE_TYPE_MAX77836:
	385	supported_regulators = max77836_supported_regulators;
	386	supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
	387	break;
	388	case MAXIM_DEVICE_TYPE_MAX14577:
	389	default:
	390	supported_regulators = max14577_supported_regulators;
	391	supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
	392	}
	393
b0902bbe	394	config.dev = &pdev->dev;
8a82b408	395	config.driver_data = max14577;
b0902bbe	396
8a82b408	397	for (i = 0; i < supported_regulators_size; i++) {
b0902bbe KK	398	struct regulator_dev *regulator;
	399	/*
	400	* Index of supported_regulators[] is also the id and must
	401	* match index of pdata->regulators[].
	402	*/
	403	if (pdata && pdata->regulators) {
	404	config.init_data = pdata->regulators[i].initdata;
	405	config.of_node = pdata->regulators[i].of_node;
	406	} else {
8a82b408 KK	407	config.init_data = match_init_data(i, dev_type);
8a82b408 KK	408	config.of_node = match_of_node(i, dev_type);
b0902bbe	409	}
8a82b408 KK	410	config.regmap = max14577_get_regmap(max14577,
8a82b408 KK	411	supported_regulators[i].id);
b0902bbe KK	412
	413	regulator = devm_regulator_register(&pdev->dev,
	414	&supported_regulators[i], &config);
	415	if (IS_ERR(regulator)) {
	416	ret = PTR_ERR(regulator);
	417	dev_err(&pdev->dev,
8a82b408 KK	418	"Regulator init failed for %d/%s with error: %d\n",
8a82b408 KK	419	i, supported_regulators[i].name, ret);
b0902bbe KK	420	return ret;
	421	}
	422	}
	423
	424	return ret;
	425	}
	426
8a82b408 KK	427	static const struct platform_device_id max14577_regulator_id[] = {
	428	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
	429	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
	430	{ }
	431	};
	432	MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
	433
b0902bbe KK	434	static struct platform_driver max14577_regulator_driver = {
	435	.driver = {
	436	.owner = THIS_MODULE,
	437	.name = "max14577-regulator",
	438	},
8a82b408 KK	439	.probe = max14577_regulator_probe,
8a82b408 KK	440	.id_table = max14577_regulator_id,
b0902bbe KK	441	};
	442
	443	static int __init max14577_regulator_init(void)
	444	{
8a82b408	445	/* Check for valid values for charger */
b0902bbe KK	446	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
	447	MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
	448	MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
8a82b408 KK	449	BUILD_BUG_ON(MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START +
	450	MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
	451	MAX77836_REGULATOR_CURRENT_LIMIT_MAX);
	452	/* Valid charger current values must be provided for each chipset */
	453	BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);
	454
	455	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
	456	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
	457
	458	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
	459	(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
	460	(MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
	461	MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
b0902bbe KK	462
	463	return platform_driver_register(&max14577_regulator_driver);
	464	}
	465	subsys_initcall(max14577_regulator_init);
	466
	467	static void __exit max14577_regulator_exit(void)
	468	{
	469	platform_driver_unregister(&max14577_regulator_driver);
	470	}
	471	module_exit(max14577_regulator_exit);
	472
	473	MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
8a82b408	474	MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
b0902bbe	475	MODULE_LICENSE("GPL");
9f45a3dd	476	MODULE_ALIAS("platform:max14577-regulator");