]>
Commit | Line | Data |
---|---|---|
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 | ||
25 | struct sy8106a { | |
26 | struct regulator_dev *rdev; | |
27 | struct regmap *regmap; | |
28 | u32 fixed_voltage; | |
29 | }; | |
30 | ||
31 | static const struct regmap_config sy8106a_regmap_config = { | |
32 | .reg_bits = 8, | |
33 | .val_bits = 8, | |
34 | }; | |
35 | ||
36 | static const struct regulator_ops sy8106a_ops = { | |
37 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
38 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
39 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
40 | .list_voltage = regulator_list_voltage_linear, | |
41 | /* Enabling/disabling the regulator is not yet implemented */ | |
42 | }; | |
43 | ||
44 | /* Default limits measured in millivolts */ | |
45 | #define SY8106A_MIN_MV 680 | |
46 | #define SY8106A_MAX_MV 1950 | |
47 | #define SY8106A_STEP_MV 10 | |
48 | ||
49 | static const struct regulator_desc sy8106a_reg = { | |
50 | .name = "SY8106A", | |
51 | .id = 0, | |
52 | .ops = &sy8106a_ops, | |
53 | .type = REGULATOR_VOLTAGE, | |
54 | .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1, | |
55 | .min_uV = (SY8106A_MIN_MV * 1000), | |
56 | .uV_step = (SY8106A_STEP_MV * 1000), | |
57 | .vsel_reg = SY8106A_REG_VOUT1_SEL, | |
58 | .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK, | |
59 | /* | |
60 | * This ramp_delay is a conservative default value which works on | |
61 | * H3/H5 boards VDD-CPUX situations. | |
62 | */ | |
63 | .ramp_delay = 200, | |
64 | .owner = THIS_MODULE, | |
65 | }; | |
66 | ||
67 | /* | |
68 | * I2C driver interface functions | |
69 | */ | |
70 | static int sy8106a_i2c_probe(struct i2c_client *i2c, | |
71 | const struct i2c_device_id *id) | |
72 | { | |
73 | struct sy8106a *chip; | |
74 | struct device *dev = &i2c->dev; | |
75 | struct regulator_dev *rdev = NULL; | |
76 | struct regulator_config config = { }; | |
77 | unsigned int reg, vsel; | |
78 | int error; | |
79 | ||
80 | chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL); | |
81 | if (!chip) | |
82 | return -ENOMEM; | |
83 | ||
84 | error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt", | |
85 | &chip->fixed_voltage); | |
86 | if (error) | |
87 | return error; | |
88 | ||
89 | if (chip->fixed_voltage < SY8106A_MIN_MV * 1000 || | |
90 | chip->fixed_voltage > SY8106A_MAX_MV * 1000) | |
91 | return -EINVAL; | |
92 | ||
93 | chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config); | |
94 | if (IS_ERR(chip->regmap)) { | |
95 | error = PTR_ERR(chip->regmap); | |
96 | dev_err(dev, "Failed to allocate register map: %d\n", error); | |
97 | return error; | |
98 | } | |
99 | ||
100 | config.dev = &i2c->dev; | |
101 | config.regmap = chip->regmap; | |
102 | config.driver_data = chip; | |
103 | ||
104 | config.of_node = dev->of_node; | |
105 | config.init_data = of_get_regulator_init_data(dev, dev->of_node, | |
106 | &sy8106a_reg); | |
107 | ||
108 | if (!config.init_data) | |
109 | return -ENOMEM; | |
110 | ||
111 | /* Ensure GO_BIT is enabled when probing */ | |
112 | error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, ®); | |
113 | if (error) | |
114 | return error; | |
115 | ||
116 | if (!(reg & SY8106A_GO_BIT)) { | |
117 | vsel = (chip->fixed_voltage / 1000 - SY8106A_MIN_MV) / | |
118 | SY8106A_STEP_MV; | |
119 | ||
120 | error = regmap_write(chip->regmap, SY8106A_REG_VOUT1_SEL, | |
121 | vsel | SY8106A_GO_BIT); | |
122 | if (error) | |
123 | return error; | |
124 | } | |
125 | ||
126 | /* Probe regulator */ | |
127 | rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config); | |
128 | if (IS_ERR(rdev)) { | |
129 | error = PTR_ERR(rdev); | |
130 | dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error); | |
131 | return error; | |
132 | } | |
133 | ||
134 | chip->rdev = rdev; | |
135 | ||
136 | i2c_set_clientdata(i2c, chip); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static const struct of_device_id sy8106a_i2c_of_match[] = { | |
142 | { .compatible = "silergy,sy8106a" }, | |
143 | { }, | |
144 | }; | |
145 | MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match); | |
146 | ||
147 | static const struct i2c_device_id sy8106a_i2c_id[] = { | |
148 | { "sy8106a", 0 }, | |
149 | { }, | |
150 | }; | |
151 | MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id); | |
152 | ||
153 | static struct i2c_driver sy8106a_regulator_driver = { | |
154 | .driver = { | |
155 | .name = "sy8106a", | |
156 | .of_match_table = of_match_ptr(sy8106a_i2c_of_match), | |
157 | }, | |
158 | .probe = sy8106a_i2c_probe, | |
159 | .id_table = sy8106a_i2c_id, | |
160 | }; | |
161 | ||
162 | module_i2c_driver(sy8106a_regulator_driver); | |
163 | ||
164 | MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>"); | |
165 | MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); | |
166 | MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); | |
167 | MODULE_LICENSE("GPL"); |