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 
7 enum fan53880_regulator_ids {
8 	FAN53880_LDO1,
9 	FAN53880_LDO2,
10 	FAN53880_LDO3,
11 	FAN53880_LDO4,
12 	FAN53880_BUCK,
13 	FAN53880_BOOST,
14 };
15 
16 enum 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 
32 static 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 
64 static 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 
111 static const struct regmap_config fan53880_regmap = {
112 	.reg_bits = 8,
113 	.val_bits = 8,
114 	.max_register = FAN53880_ENABLE_BOOST,
115 };
116 
fan53880_i2c_probe(struct i2c_client * i2c)117 static 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 
160 static const struct of_device_id fan53880_dt_ids[] = {
161 	{ .compatible = "onnn,fan53880", },
162 	{}
163 };
164 MODULE_DEVICE_TABLE(of, fan53880_dt_ids);
165 
166 static const struct i2c_device_id fan53880_i2c_id[] = {
167 	{ "fan53880", },
168 	{}
169 };
170 MODULE_DEVICE_TABLE(i2c, fan53880_i2c_id);
171 
172 static struct i2c_driver fan53880_regulator_driver = {
173 	.driver = {
174 		.name = "fan53880",
175 		.of_match_table	= fan53880_dt_ids,
176 	},
177 	.probe_new = fan53880_i2c_probe,
178 	.id_table = fan53880_i2c_id,
179 };
180 module_i2c_driver(fan53880_regulator_driver);
181 
182 MODULE_DESCRIPTION("FAN53880 PMIC voltage regulator driver");
183 MODULE_AUTHOR("Christoph Fritz <chf.fritz@googlemail.com>");
184 MODULE_LICENSE("GPL");
185