summaryrefslogtreecommitdiff
path: root/drivers/regulator/mp8859.c
blob: f2300714d5a96ee9db591ab9941ba2203f752b22 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
// 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[] = {
	{.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",
		.of_match_table = of_match_ptr(mp8859_dt_id),
	},
	.probe_new = 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");