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
|
// SPDX-License-Identifier: GPL-2.0+
//
// Functions to access SY3686A power management chip voltages
//
// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
//
// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
// Alistair Francis <alistair@alistair23.me>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/mfd/sy7636a.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
struct sy7636a_data {
struct regmap *regmap;
struct gpio_desc *pgood_gpio;
};
static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev)
{
int ret;
unsigned int val, val_h;
ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val);
if (ret)
return ret;
ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h);
if (ret)
return ret;
val |= (val_h << VCOM_ADJUST_CTRL_SHIFT);
return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL;
}
static int sy7636a_get_status(struct regulator_dev *rdev)
{
struct sy7636a_data *data = dev_get_drvdata(rdev->dev.parent);
int ret = 0;
ret = gpiod_get_value_cansleep(data->pgood_gpio);
if (ret < 0)
dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret);
return ret;
}
static const struct regulator_ops sy7636a_vcom_volt_ops = {
.get_voltage = sy7636a_get_vcom_voltage_op,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = sy7636a_get_status,
};
static const struct regulator_desc desc = {
.name = "vcom",
.id = 0,
.ops = &sy7636a_vcom_volt_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = SY7636A_REG_OPERATION_MODE_CRL,
.enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF,
.regulators_node = of_match_ptr("regulators"),
.of_match = of_match_ptr("vcom"),
};
static int sy7636a_regulator_probe(struct platform_device *pdev)
{
struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
struct regulator_config config = { };
struct regulator_dev *rdev;
struct gpio_desc *gdp;
struct sy7636a_data *data;
int ret;
if (!regmap)
return -EPROBE_DEFER;
gdp = devm_gpiod_get(pdev->dev.parent, "epd-pwr-good", GPIOD_IN);
if (IS_ERR(gdp)) {
dev_err(pdev->dev.parent, "Power good GPIO fault %ld\n", PTR_ERR(gdp));
return PTR_ERR(gdp);
}
data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regmap = regmap;
data->pgood_gpio = gdp;
platform_set_drvdata(pdev, data);
ret = regmap_write(regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0);
if (ret) {
dev_err(pdev->dev.parent, "Failed to initialize regulator: %d\n", ret);
return ret;
}
config.dev = &pdev->dev;
config.dev->of_node = pdev->dev.parent->of_node;
config.regmap = regmap;
rdev = devm_regulator_register(&pdev->dev, &desc, &config);
if (IS_ERR(rdev)) {
dev_err(pdev->dev.parent, "Failed to register %s regulator\n",
pdev->name);
return PTR_ERR(rdev);
}
return 0;
}
static const struct platform_device_id sy7636a_regulator_id_table[] = {
{ "sy7636a-regulator", },
{ }
};
MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table);
static struct platform_driver sy7636a_regulator_driver = {
.driver = {
.name = "sy7636a-regulator",
},
.probe = sy7636a_regulator_probe,
.id_table = sy7636a_regulator_id_table,
};
module_platform_driver(sy7636a_regulator_driver);
MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>");
MODULE_DESCRIPTION("SY7636A voltage regulator driver");
MODULE_LICENSE("GPL v2");
|
