1// SPDX-License-Identifier: GPL-2.0+
2#include <linux/module.h>
3#include <linux/i2c.h>
4#include <linux/regmap.h>
5#include <linux/regulator/driver.h>
6
7enum fan53880_regulator_ids {
8	FAN53880_LDO1,
9	FAN53880_LDO2,
10	FAN53880_LDO3,
11	FAN53880_LDO4,
12	FAN53880_BUCK,
13	FAN53880_BOOST,
14};
15
16enum fan53880_registers {
17	FAN53880_PRODUCT_ID = 0x00,
18	FAN53880_SILICON_REV,
19	FAN53880_BUCKVOUT,
20	FAN53880_BOOSTVOUT,
21	FAN53880_LDO1VOUT,
22	FAN53880_LDO2VOUT,
23	FAN53880_LDO3VOUT,
24	FAN53880_LDO4VOUT,
25	FAN53880_IOUT,
26	FAN53880_ENABLE,
27	FAN53880_ENABLE_BOOST,
28};
29
30#define FAN53880_ID	0x01
31
32static const struct regulator_ops fan53880_ops = {
33	.list_voltage = regulator_list_voltage_linear_range,
34	.map_voltage = regulator_map_voltage_linear_range,
35	.set_voltage_sel = regulator_set_voltage_sel_regmap,
36	.get_voltage_sel = regulator_get_voltage_sel_regmap,
37	.enable = regulator_enable_regmap,
38	.disable = regulator_disable_regmap,
39	.is_enabled = regulator_is_enabled_regmap,
40};
41
42#define FAN53880_LDO(_num, _supply, _default)				\
43	[FAN53880_LDO ## _num] = {					\
44		.name =		   "LDO"#_num,				\
45		.of_match =	   "LDO"#_num,		\
46		.regulators_node = "regulators",		\
47		.type =		   REGULATOR_VOLTAGE,			\
48		.owner =	   THIS_MODULE,				\
49		.linear_ranges =   (struct linear_range[]) {		\
50		      REGULATOR_LINEAR_RANGE(_default, 0x0, 0x0, 0),	\
51		      REGULATOR_LINEAR_RANGE(800000, 0xf, 0x73, 25000),	\
52		},							\
53		.n_linear_ranges = 2,					\
54		.n_voltages =	   0x74,				\
55		.vsel_reg =	   FAN53880_LDO ## _num ## VOUT,	\
56		.vsel_mask =	   0x7f,				\
57		.enable_reg =	   FAN53880_ENABLE,			\
58		.enable_mask =	   BIT(_num - 1),			\
59		.enable_time =	   150,					\
60		.supply_name =	   _supply,				\
61		.ops =		   &fan53880_ops,			\
62	}
63
64static const struct regulator_desc fan53880_regulators[] = {
65	FAN53880_LDO(1, "VIN12", 2800000),
66	FAN53880_LDO(2, "VIN12", 2800000),
67	FAN53880_LDO(3, "VIN3", 1800000),
68	FAN53880_LDO(4, "VIN4", 1800000),
69	[FAN53880_BUCK] = {
70		.name =		   "BUCK",
71		.of_match =	   "BUCK",
72		.regulators_node = "regulators",
73		.type =		   REGULATOR_VOLTAGE,
74		.owner =	   THIS_MODULE,
75		.linear_ranges =   (struct linear_range[]) {
76		      REGULATOR_LINEAR_RANGE(1100000, 0x0, 0x0, 0),
77		      REGULATOR_LINEAR_RANGE(600000, 0x1f, 0xf7, 12500),
78		},
79		.n_linear_ranges = 2,
80		.n_voltages =	   0xf8,
81		.vsel_reg =	   FAN53880_BUCKVOUT,
82		.vsel_mask =	   0xff,
83		.enable_reg =	   FAN53880_ENABLE,
84		.enable_mask =	   0x10,
85		.enable_time =	   480,
86		.supply_name =	   "PVIN",
87		.ops =		   &fan53880_ops,
88	},
89	[FAN53880_BOOST] = {
90		.name =		   "BOOST",
91		.of_match =	   "BOOST",
92		.regulators_node = "regulators",
93		.type =		   REGULATOR_VOLTAGE,
94		.owner =	   THIS_MODULE,
95		.linear_ranges =   (struct linear_range[]) {
96		      REGULATOR_LINEAR_RANGE(5000000, 0x0, 0x0, 0),
97		      REGULATOR_LINEAR_RANGE(3000000, 0x4, 0x70, 25000),
98		},
99		.n_linear_ranges = 2,
100		.n_voltages =	   0x71,
101		.vsel_reg =	   FAN53880_BOOSTVOUT,
102		.vsel_mask =	   0x7f,
103		.enable_reg =	   FAN53880_ENABLE_BOOST,
104		.enable_mask =	   0xff,
105		.enable_time =	   580,
106		.supply_name =	   "PVIN",
107		.ops =		   &fan53880_ops,
108	},
109};
110
111static const struct regmap_config fan53880_regmap = {
112	.reg_bits = 8,
113	.val_bits = 8,
114	.max_register = FAN53880_ENABLE_BOOST,
115};
116
117static int fan53880_i2c_probe(struct i2c_client *i2c)
118{
119	struct regulator_config config = { };
120	struct regulator_dev *rdev;
121	struct regmap *regmap;
122	int i, ret;
123	unsigned int data;
124
125	regmap = devm_regmap_init_i2c(i2c, &fan53880_regmap);
126	if (IS_ERR(regmap)) {
127		ret = PTR_ERR(regmap);
128		dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
129		return ret;
130	}
131
132	ret = regmap_read(regmap, FAN53880_PRODUCT_ID, &data);
133	if (ret < 0) {
134		dev_err(&i2c->dev, "Failed to read PRODUCT_ID: %d\n", ret);
135		return ret;
136	}
137	if (data != FAN53880_ID) {
138		dev_err(&i2c->dev, "Unsupported device id: 0x%x.\n", data);
139		return -ENODEV;
140	}
141
142	config.dev = &i2c->dev;
143	config.init_data = NULL;
144
145	for (i = 0; i < ARRAY_SIZE(fan53880_regulators); i++) {
146		rdev = devm_regulator_register(&i2c->dev,
147					       &fan53880_regulators[i],
148					       &config);
149		if (IS_ERR(rdev)) {
150			ret = PTR_ERR(rdev);
151			dev_err(&i2c->dev, "Failed to register %s: %d\n",
152				fan53880_regulators[i].name, ret);
153			return ret;
154		}
155	}
156
157	return 0;
158}
159
160static const struct of_device_id fan53880_dt_ids[] = {
161	{ .compatible = "onnn,fan53880", },
162	{}
163};
164MODULE_DEVICE_TABLE(of, fan53880_dt_ids);
165
166static const struct i2c_device_id fan53880_i2c_id[] = {
167	{ "fan53880", },
168	{}
169};
170MODULE_DEVICE_TABLE(i2c, fan53880_i2c_id);
171
172static struct i2c_driver fan53880_regulator_driver = {
173	.driver = {
174		.name = "fan53880",
175		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
176		.of_match_table	= fan53880_dt_ids,
177	},
178	.probe = fan53880_i2c_probe,
179	.id_table = fan53880_i2c_id,
180};
181module_i2c_driver(fan53880_regulator_driver);
182
183MODULE_DESCRIPTION("FAN53880 PMIC voltage regulator driver");
184MODULE_AUTHOR("Christoph Fritz <chf.fritz@googlemail.com>");
185MODULE_LICENSE("GPL");
186