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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 | */ | |
77e29598 | 64 | static int sy8106a_i2c_probe(struct i2c_client *i2c) |
8878302e | 65 | { |
8878302e | 66 | struct device *dev = &i2c->dev; |
5d7ebba3 | 67 | struct regulator_dev *rdev; |
8878302e | 68 | struct regulator_config config = { }; |
5d7ebba3 | 69 | struct regmap *regmap; |
8878302e | 70 | unsigned int reg, vsel; |
5d7ebba3 | 71 | u32 fixed_voltage; |
8878302e OJ |
72 | int error; |
73 | ||
8878302e | 74 | error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt", |
5d7ebba3 | 75 | &fixed_voltage); |
8878302e OJ |
76 | if (error) |
77 | return error; | |
78 | ||
5d7ebba3 AL |
79 | if (fixed_voltage < SY8106A_MIN_MV * 1000 || |
80 | fixed_voltage > SY8106A_MAX_MV * 1000) | |
8878302e OJ |
81 | return -EINVAL; |
82 | ||
5d7ebba3 AL |
83 | regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config); |
84 | if (IS_ERR(regmap)) { | |
85 | error = PTR_ERR(regmap); | |
8878302e OJ |
86 | dev_err(dev, "Failed to allocate register map: %d\n", error); |
87 | return error; | |
88 | } | |
89 | ||
90 | config.dev = &i2c->dev; | |
5d7ebba3 | 91 | config.regmap = regmap; |
8878302e OJ |
92 | |
93 | config.of_node = dev->of_node; | |
94 | config.init_data = of_get_regulator_init_data(dev, dev->of_node, | |
95 | &sy8106a_reg); | |
96 | ||
97 | if (!config.init_data) | |
98 | return -ENOMEM; | |
99 | ||
100 | /* Ensure GO_BIT is enabled when probing */ | |
5d7ebba3 | 101 | error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, ®); |
8878302e OJ |
102 | if (error) |
103 | return error; | |
104 | ||
105 | if (!(reg & SY8106A_GO_BIT)) { | |
5d7ebba3 | 106 | vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) / |
8878302e OJ |
107 | SY8106A_STEP_MV; |
108 | ||
5d7ebba3 | 109 | error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL, |
8878302e OJ |
110 | vsel | SY8106A_GO_BIT); |
111 | if (error) | |
112 | return error; | |
113 | } | |
114 | ||
115 | /* Probe regulator */ | |
116 | rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config); | |
117 | if (IS_ERR(rdev)) { | |
118 | error = PTR_ERR(rdev); | |
119 | dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error); | |
120 | return error; | |
121 | } | |
122 | ||
8878302e OJ |
123 | return 0; |
124 | } | |
125 | ||
bbe26107 | 126 | static const struct of_device_id __maybe_unused sy8106a_i2c_of_match[] = { |
8878302e OJ |
127 | { .compatible = "silergy,sy8106a" }, |
128 | { }, | |
129 | }; | |
130 | MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match); | |
131 | ||
132 | static const struct i2c_device_id sy8106a_i2c_id[] = { | |
133 | { "sy8106a", 0 }, | |
134 | { }, | |
135 | }; | |
136 | MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id); | |
137 | ||
138 | static struct i2c_driver sy8106a_regulator_driver = { | |
139 | .driver = { | |
140 | .name = "sy8106a", | |
141 | .of_match_table = of_match_ptr(sy8106a_i2c_of_match), | |
142 | }, | |
77e29598 | 143 | .probe_new = sy8106a_i2c_probe, |
8878302e OJ |
144 | .id_table = sy8106a_i2c_id, |
145 | }; | |
146 | ||
147 | module_i2c_driver(sy8106a_regulator_driver); | |
148 | ||
149 | MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>"); | |
150 | MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); | |
151 | MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); | |
152 | MODULE_LICENSE("GPL"); |