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
158
159
160
161
162
163
164
165
166
167
|
// SPDX-License-Identifier: GPL-2.0+
//
// sy8106a-regulator.c - Regulator device driver for SY8106A
//
// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define SY8106A_REG_VOUT1_SEL 0x01
#define SY8106A_REG_VOUT_COM 0x02
#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
#define SY8106A_DISABLE_REG BIT(0)
/*
* The I2C controlled voltage will only work when this bit is set; otherwise
* it will behave like a fixed regulator.
*/
#define SY8106A_GO_BIT BIT(7)
struct sy8106a {
struct regulator_dev *rdev;
struct regmap *regmap;
u32 fixed_voltage;
};
static const struct regmap_config sy8106a_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static const struct regulator_ops sy8106a_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
/* Enabling/disabling the regulator is not yet implemented */
};
/* Default limits measured in millivolts */
#define SY8106A_MIN_MV 680
#define SY8106A_MAX_MV 1950
#define SY8106A_STEP_MV 10
static const struct regulator_desc sy8106a_reg = {
.name = "SY8106A",
.id = 0,
.ops = &sy8106a_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
.min_uV = (SY8106A_MIN_MV * 1000),
.uV_step = (SY8106A_STEP_MV * 1000),
.vsel_reg = SY8106A_REG_VOUT1_SEL,
.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
/*
* This ramp_delay is a conservative default value which works on
* H3/H5 boards VDD-CPUX situations.
*/
.ramp_delay = 200,
.owner = THIS_MODULE,
};
/*
* I2C driver interface functions
*/
static int sy8106a_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct sy8106a *chip;
struct device *dev = &i2c->dev;
struct regulator_dev *rdev = NULL;
struct regulator_config config = { };
unsigned int reg, vsel;
int error;
chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL);
if (!chip)
return -ENOMEM;
error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
&chip->fixed_voltage);
if (error)
return error;
if (chip->fixed_voltage < SY8106A_MIN_MV * 1000 ||
chip->fixed_voltage > SY8106A_MAX_MV * 1000)
return -EINVAL;
chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
if (IS_ERR(chip->regmap)) {
error = PTR_ERR(chip->regmap);
dev_err(dev, "Failed to allocate register map: %d\n", error);
return error;
}
config.dev = &i2c->dev;
config.regmap = chip->regmap;
config.driver_data = chip;
config.of_node = dev->of_node;
config.init_data = of_get_regulator_init_data(dev, dev->of_node,
&sy8106a_reg);
if (!config.init_data)
return -ENOMEM;
/* Ensure GO_BIT is enabled when probing */
error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, ®);
if (error)
return error;
if (!(reg & SY8106A_GO_BIT)) {
vsel = (chip->fixed_voltage / 1000 - SY8106A_MIN_MV) /
SY8106A_STEP_MV;
error = regmap_write(chip->regmap, SY8106A_REG_VOUT1_SEL,
vsel | SY8106A_GO_BIT);
if (error)
return error;
}
/* Probe regulator */
rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
if (IS_ERR(rdev)) {
error = PTR_ERR(rdev);
dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
return error;
}
chip->rdev = rdev;
i2c_set_clientdata(i2c, chip);
return 0;
}
static const struct of_device_id sy8106a_i2c_of_match[] = {
{ .compatible = "silergy,sy8106a" },
{ },
};
MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);
static const struct i2c_device_id sy8106a_i2c_id[] = {
{ "sy8106a", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
static struct i2c_driver sy8106a_regulator_driver = {
.driver = {
.name = "sy8106a",
.of_match_table = of_match_ptr(sy8106a_i2c_of_match),
},
.probe = sy8106a_i2c_probe,
.id_table = sy8106a_i2c_id,
};
module_i2c_driver(sy8106a_regulator_driver);
MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
MODULE_LICENSE("GPL");
|
