[linux-2.6-block.git] / drivers / regulator / sy8106a-regulator.c

// SPDX-License-Identifier: GPL-2.0+
//
// sy8106a-regulator.c - Regulator device driver for SY8106A
//
// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define SY8106A_REG_VOUT1_SEL		0x01
#define SY8106A_REG_VOUT_COM		0x02
#define SY8106A_REG_VOUT1_SEL_MASK	0x7f
#define SY8106A_DISABLE_REG		BIT(0)
/*
 * The I2C controlled voltage will only work when this bit is set; otherwise
 * it will behave like a fixed regulator.
 */
#define SY8106A_GO_BIT			BIT(7)

static const struct regmap_config sy8106a_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static const struct regulator_ops sy8106a_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	/* Enabling/disabling the regulator is not yet implemented */
};

/* Default limits measured in millivolts */
#define SY8106A_MIN_MV		680
#define SY8106A_MAX_MV		1950
#define SY8106A_STEP_MV		10

static const struct regulator_desc sy8106a_reg = {
	.name = "SY8106A",
	.id = 0,
	.ops = &sy8106a_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
	.min_uV = (SY8106A_MIN_MV * 1000),
	.uV_step = (SY8106A_STEP_MV * 1000),
	.vsel_reg = SY8106A_REG_VOUT1_SEL,
	.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
	/*
	 * This ramp_delay is a conservative default value which works on
	 * H3/H5 boards VDD-CPUX situations.
	 */
	.ramp_delay = 200,
	.owner = THIS_MODULE,
};

/*
 * I2C driver interface functions
 */
static int sy8106a_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct device *dev = &i2c->dev;
	struct regulator_dev *rdev;
	struct regulator_config config = { };
	struct regmap *regmap;
	unsigned int reg, vsel;
	u32 fixed_voltage;
	int error;

	error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
				     &fixed_voltage);
	if (error)
		return error;

	if (fixed_voltage < SY8106A_MIN_MV * 1000 ||
	    fixed_voltage > SY8106A_MAX_MV * 1000)
		return -EINVAL;

	regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
	if (IS_ERR(regmap)) {
		error = PTR_ERR(regmap);
		dev_err(dev, "Failed to allocate register map: %d\n", error);
		return error;
	}

	config.dev = &i2c->dev;
	config.regmap = regmap;

	config.of_node = dev->of_node;
	config.init_data = of_get_regulator_init_data(dev, dev->of_node,
						      &sy8106a_reg);

	if (!config.init_data)
		return -ENOMEM;

	/* Ensure GO_BIT is enabled when probing */
	error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, &reg);
	if (error)
		return error;

	if (!(reg & SY8106A_GO_BIT)) {
		vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) /
		       SY8106A_STEP_MV;

		error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL,
				     vsel | SY8106A_GO_BIT);
		if (error)
			return error;
	}

	/* Probe regulator */
	rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
	if (IS_ERR(rdev)) {
		error = PTR_ERR(rdev);
		dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
		return error;
	}

	return 0;
}

static const struct of_device_id sy8106a_i2c_of_match[] = {
	{ .compatible = "silergy,sy8106a" },
	{ },
};
MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);

static const struct i2c_device_id sy8106a_i2c_id[] = {
	{ "sy8106a", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);

static struct i2c_driver sy8106a_regulator_driver = {
	.driver = {
		.name = "sy8106a",
		.of_match_table	= of_match_ptr(sy8106a_i2c_of_match),
	},
	.probe = sy8106a_i2c_probe,
	.id_table = sy8106a_i2c_id,
};

module_i2c_driver(sy8106a_regulator_driver);

MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
MODULE_LICENSE("GPL");
Commit	Line	Data
8878302e OJ	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// sy8106a-regulator.c - Regulator device driver for SY8106A
	4	//
	5	// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
	6	// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>
	7
	8	#include <linux/err.h>
	9	#include <linux/i2c.h>
	10	#include <linux/module.h>
	11	#include <linux/regmap.h>
	12	#include <linux/regulator/driver.h>
	13	#include <linux/regulator/of_regulator.h>
	14
	15	#define SY8106A_REG_VOUT1_SEL 0x01
	16	#define SY8106A_REG_VOUT_COM 0x02
	17	#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
	18	#define SY8106A_DISABLE_REG BIT(0)
	19	/*
	20	* The I2C controlled voltage will only work when this bit is set; otherwise
	21	* it will behave like a fixed regulator.
	22	*/
	23	#define SY8106A_GO_BIT BIT(7)
	24
8878302e OJ	25	static const struct regmap_config sy8106a_regmap_config = {
	26	.reg_bits = 8,
	27	.val_bits = 8,
	28	};
	29
	30	static const struct regulator_ops sy8106a_ops = {
	31	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	32	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	33	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	34	.list_voltage = regulator_list_voltage_linear,
	35	/* Enabling/disabling the regulator is not yet implemented */
	36	};
	37
	38	/* Default limits measured in millivolts */
	39	#define SY8106A_MIN_MV 680
	40	#define SY8106A_MAX_MV 1950
	41	#define SY8106A_STEP_MV 10
	42
	43	static const struct regulator_desc sy8106a_reg = {
	44	.name = "SY8106A",
	45	.id = 0,
	46	.ops = &sy8106a_ops,
	47	.type = REGULATOR_VOLTAGE,
	48	.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
	49	.min_uV = (SY8106A_MIN_MV * 1000),
	50	.uV_step = (SY8106A_STEP_MV * 1000),
	51	.vsel_reg = SY8106A_REG_VOUT1_SEL,
	52	.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
	53	/*
	54	* This ramp_delay is a conservative default value which works on
	55	* H3/H5 boards VDD-CPUX situations.
	56	*/
	57	.ramp_delay = 200,
	58	.owner = THIS_MODULE,
	59	};
	60
	61	/*
	62	* I2C driver interface functions
	63	*/
	64	static int sy8106a_i2c_probe(struct i2c_client *i2c,
	65	const struct i2c_device_id *id)
	66	{
8878302e	67	struct device *dev = &i2c->dev;
5d7ebba3	68	struct regulator_dev *rdev;
8878302e	69	struct regulator_config config = { };
5d7ebba3	70	struct regmap *regmap;
8878302e	71	unsigned int reg, vsel;
5d7ebba3	72	u32 fixed_voltage;
8878302e OJ	73	int error;
8878302e OJ	74
8878302e	75	error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
5d7ebba3	76	&fixed_voltage);
8878302e OJ	77	if (error)
	78	return error;
	79
5d7ebba3 AL	80	if (fixed_voltage < SY8106A_MIN_MV * 1000 \|\|
5d7ebba3 AL	81	fixed_voltage > SY8106A_MAX_MV * 1000)
8878302e OJ	82	return -EINVAL;
8878302e OJ	83
5d7ebba3 AL	84	regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
	85	if (IS_ERR(regmap)) {
	86	error = PTR_ERR(regmap);
8878302e OJ	87	dev_err(dev, "Failed to allocate register map: %d\n", error);
	88	return error;
	89	}
	90
	91	config.dev = &i2c->dev;
5d7ebba3	92	config.regmap = regmap;
8878302e OJ	93
	94	config.of_node = dev->of_node;
	95	config.init_data = of_get_regulator_init_data(dev, dev->of_node,
	96	&sy8106a_reg);
	97
	98	if (!config.init_data)
	99	return -ENOMEM;
	100
	101	/* Ensure GO_BIT is enabled when probing */
5d7ebba3	102	error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, &reg);
8878302e OJ	103	if (error)
	104	return error;
	105
	106	if (!(reg & SY8106A_GO_BIT)) {
5d7ebba3	107	vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) /
8878302e OJ	108	SY8106A_STEP_MV;
8878302e OJ	109
5d7ebba3	110	error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL,
8878302e OJ	111	vsel \| SY8106A_GO_BIT);
	112	if (error)
	113	return error;
	114	}
	115
	116	/* Probe regulator */
	117	rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
	118	if (IS_ERR(rdev)) {
	119	error = PTR_ERR(rdev);
	120	dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
	121	return error;
	122	}
	123
8878302e OJ	124	return 0;
	125	}
	126
	127	static const struct of_device_id sy8106a_i2c_of_match[] = {
	128	{ .compatible = "silergy,sy8106a" },
	129	{ },
	130	};
	131	MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);
	132
	133	static const struct i2c_device_id sy8106a_i2c_id[] = {
	134	{ "sy8106a", 0 },
	135	{ },
	136	};
	137	MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
	138
	139	static struct i2c_driver sy8106a_regulator_driver = {
	140	.driver = {
	141	.name = "sy8106a",
	142	.of_match_table = of_match_ptr(sy8106a_i2c_of_match),
	143	},
	144	.probe = sy8106a_i2c_probe,
	145	.id_table = sy8106a_i2c_id,
	146	};
	147
	148	module_i2c_driver(sy8106a_regulator_driver);
	149
	150	MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
	151	MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
	152	MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
	153	MODULE_LICENSE("GPL");