[linux-2.6-block.git] / drivers / regulator / mp8859.c

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 five technologies GmbH
// Author: Markus Reichl <m.reichl@fivetechno.de>

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


#define VOL_MIN_IDX			0x00
#define VOL_MAX_IDX			0x7ff

/* Register definitions */
#define MP8859_VOUT_L_REG		0    //3 lo Bits
#define MP8859_VOUT_H_REG		1    //8 hi Bits
#define MP8859_VOUT_GO_REG		2
#define MP8859_IOUT_LIM_REG		3
#define MP8859_CTL1_REG			4
#define MP8859_CTL2_REG			5
#define MP8859_RESERVED1_REG		6
#define MP8859_RESERVED2_REG		7
#define MP8859_RESERVED3_REG		8
#define MP8859_STATUS_REG		9
#define MP8859_INTERRUPT_REG		0x0A
#define MP8859_MASK_REG			0x0B
#define MP8859_ID1_REG			0x0C
#define MP8859_MFR_ID_REG		0x27
#define MP8859_DEV_ID_REG		0x28
#define MP8859_IC_REV_REG		0x29

#define MP8859_MAX_REG			0x29

#define MP8859_GO_BIT			0x01


static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
	int ret;

	ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);

	if (ret)
		return ret;
	ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);

	if (ret)
		return ret;
	ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
					MP8859_GO_BIT, 1);
	return ret;
}

static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
{
	unsigned int val_tmp;
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);

	if (ret)
		return ret;
	val = val_tmp << 3;

	ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);

	if (ret)
		return ret;
	val |= val_tmp & 0x07;
	return val;
}

static const struct linear_range mp8859_dcdc_ranges[] = {
	REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
};

static const struct regmap_config mp8859_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MP8859_MAX_REG,
	.cache_type = REGCACHE_RBTREE,
};

static const struct regulator_ops mp8859_ops = {
	.set_voltage_sel = mp8859_set_voltage_sel,
	.get_voltage_sel = mp8859_get_voltage_sel,
	.list_voltage = regulator_list_voltage_linear_range,
};

static const struct regulator_desc mp8859_regulators[] = {
	{
		.id = 0,
		.type = REGULATOR_VOLTAGE,
		.name = "mp8859_dcdc",
		.supply_name = "vin",
		.of_match = of_match_ptr("mp8859_dcdc"),
		.n_voltages = VOL_MAX_IDX + 1,
		.linear_ranges = mp8859_dcdc_ranges,
		.n_linear_ranges = 1,
		.ops = &mp8859_ops,
		.owner = THIS_MODULE,
	},
};

static int mp8859_i2c_probe(struct i2c_client *i2c)
{
	int ret;
	struct regulator_config config = {.dev = &i2c->dev};
	struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
	struct regulator_dev *rdev;

	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
		return ret;
	}
	rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
					&config);

	if (IS_ERR(rdev)) {
		ret = PTR_ERR(rdev);
		dev_err(&i2c->dev, "failed to register %s: %d\n",
			mp8859_regulators[0].name, ret);
		return ret;
	}
	return 0;
}

static const struct of_device_id mp8859_dt_id[] __maybe_unused = {
	{.compatible =  "mps,mp8859"},
	{},
};
MODULE_DEVICE_TABLE(of, mp8859_dt_id);

static const struct i2c_device_id mp8859_i2c_id[] = {
	{ "mp8859", },
	{  },
};
MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);

static struct i2c_driver mp8859_regulator_driver = {
	.driver = {
		.name = "mp8859",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = of_match_ptr(mp8859_dt_id),
	},
	.probe = mp8859_i2c_probe,
	.id_table = mp8859_i2c_id,
};

module_i2c_driver(mp8859_regulator_driver);

MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4444a1c1 MR	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// Copyright (c) 2019 five technologies GmbH
	4	// Author: Markus Reichl <m.reichl@fivetechno.de>
	5
	6	#include <linux/module.h>
	7	#include <linux/i2c.h>
	8	#include <linux/of.h>
	9	#include <linux/regulator/driver.h>
	10	#include <linux/regmap.h>
	11
	12
	13	#define VOL_MIN_IDX 0x00
	14	#define VOL_MAX_IDX 0x7ff
	15
	16	/* Register definitions */
	17	#define MP8859_VOUT_L_REG 0 //3 lo Bits
	18	#define MP8859_VOUT_H_REG 1 //8 hi Bits
	19	#define MP8859_VOUT_GO_REG 2
	20	#define MP8859_IOUT_LIM_REG 3
	21	#define MP8859_CTL1_REG 4
	22	#define MP8859_CTL2_REG 5
	23	#define MP8859_RESERVED1_REG 6
	24	#define MP8859_RESERVED2_REG 7
	25	#define MP8859_RESERVED3_REG 8
	26	#define MP8859_STATUS_REG 9
	27	#define MP8859_INTERRUPT_REG 0x0A
	28	#define MP8859_MASK_REG 0x0B
	29	#define MP8859_ID1_REG 0x0C
	30	#define MP8859_MFR_ID_REG 0x27
	31	#define MP8859_DEV_ID_REG 0x28
	32	#define MP8859_IC_REV_REG 0x29
	33
	34	#define MP8859_MAX_REG 0x29
	35
	36	#define MP8859_GO_BIT 0x01
	37
	38
	39	static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
	40	{
	41	int ret;
	42
	43	ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
	44
	45	if (ret)
	46	return ret;
	47	ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
	48
	49	if (ret)
	50	return ret;
	51	ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
	52	MP8859_GO_BIT, 1);
	53	return ret;
	54	}
	55
	56	static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
	57	{
	58	unsigned int val_tmp;
	59	unsigned int val;
	60	int ret;
	61
	62	ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
	63
	64	if (ret)
65	return ret;
66	val = val_tmp << 3;
67
68	ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
69
70	if (ret)
71	return ret;
72	val \|= val_tmp & 0x07;
73	return val;
74	}
75
60ab7f41	76	static const struct linear_range mp8859_dcdc_ranges[] = {
4444a1c1 MR	77	REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
	78	};
	79
	80	static const struct regmap_config mp8859_regmap = {
	81	.reg_bits = 8,
	82	.val_bits = 8,
	83	.max_register = MP8859_MAX_REG,
	84	.cache_type = REGCACHE_RBTREE,
	85	};
	86
	87	static const struct regulator_ops mp8859_ops = {
	88	.set_voltage_sel = mp8859_set_voltage_sel,
	89	.get_voltage_sel = mp8859_get_voltage_sel,
	90	.list_voltage = regulator_list_voltage_linear_range,
	91	};
	92
	93	static const struct regulator_desc mp8859_regulators[] = {
	94	{
	95	.id = 0,
	96	.type = REGULATOR_VOLTAGE,
	97	.name = "mp8859_dcdc",
4d49177f	98	.supply_name = "vin",
4444a1c1 MR	99	.of_match = of_match_ptr("mp8859_dcdc"),
	100	.n_voltages = VOL_MAX_IDX + 1,
	101	.linear_ranges = mp8859_dcdc_ranges,
	102	.n_linear_ranges = 1,
	103	.ops = &mp8859_ops,
	104	.owner = THIS_MODULE,
	105	},
	106	};
	107
	108	static int mp8859_i2c_probe(struct i2c_client *i2c)
	109	{
	110	int ret;
	111	struct regulator_config config = {.dev = &i2c->dev};
	112	struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
	113	struct regulator_dev *rdev;
	114
	115	if (IS_ERR(regmap)) {
	116	ret = PTR_ERR(regmap);
	117	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	118	return ret;
	119	}
	120	rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
	121	&config);
	122
	123	if (IS_ERR(rdev)) {
	124	ret = PTR_ERR(rdev);
	125	dev_err(&i2c->dev, "failed to register %s: %d\n",
	126	mp8859_regulators[0].name, ret);
b8338051 DC	127	return ret;
b8338051 DC	128	}
4444a1c1 MR	129	return 0;
	130	}
	131
334e6b85	132	static const struct of_device_id mp8859_dt_id[] __maybe_unused = {
4444a1c1 MR	133	{.compatible = "mps,mp8859"},
	134	{},
	135	};
	136	MODULE_DEVICE_TABLE(of, mp8859_dt_id);
	137
	138	static const struct i2c_device_id mp8859_i2c_id[] = {
	139	{ "mp8859", },
	140	{ },
	141	};
	142	MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
	143
	144	static struct i2c_driver mp8859_regulator_driver = {
	145	.driver = {
	146	.name = "mp8859",
67dc71c6	147	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
4444a1c1 MR	148	.of_match_table = of_match_ptr(mp8859_dt_id),
4444a1c1 MR	149	},
964e1865	150	.probe = mp8859_i2c_probe,
4444a1c1 MR	151	.id_table = mp8859_i2c_id,
	152	};
	153
	154	module_i2c_driver(mp8859_regulator_driver);
	155
	156	MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
	157	MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
	158	MODULE_LICENSE("GPL v2");