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
|
/*
* tpl0102.c - Support for Texas Instruments digital potentiometers
*
* Copyright (C) 2016 Matt Ranostay <mranostay@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* TODO: enable/disable hi-z output control
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
struct tpl0102_cfg {
int wipers;
int max_pos;
int kohms;
};
enum tpl0102_type {
CAT5140_503,
CAT5140_104,
TPL0102_104,
TPL0401_103,
};
static const struct tpl0102_cfg tpl0102_cfg[] = {
/* on-semiconductor parts */
[CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
[CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
/* ti parts */
[TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
[TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
};
struct tpl0102_data {
struct regmap *regmap;
unsigned long devid;
};
static const struct regmap_config tpl0102_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
#define TPL0102_CHANNEL(ch) { \
.type = IIO_RESISTANCE, \
.indexed = 1, \
.output = 1, \
.channel = (ch), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
}
static const struct iio_chan_spec tpl0102_channels[] = {
TPL0102_CHANNEL(0),
TPL0102_CHANNEL(1),
};
static int tpl0102_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct tpl0102_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW: {
int ret = regmap_read(data->regmap, chan->channel, val);
return ret ? ret : IIO_VAL_INT;
}
case IIO_CHAN_INFO_SCALE:
*val = 1000 * tpl0102_cfg[data->devid].kohms;
*val2 = tpl0102_cfg[data->devid].max_pos;
return IIO_VAL_FRACTIONAL;
}
return -EINVAL;
}
static int tpl0102_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct tpl0102_data *data = iio_priv(indio_dev);
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
if (val >= tpl0102_cfg[data->devid].max_pos || val < 0)
return -EINVAL;
return regmap_write(data->regmap, chan->channel, val);
}
static const struct iio_info tpl0102_info = {
.read_raw = tpl0102_read_raw,
.write_raw = tpl0102_write_raw,
.driver_module = THIS_MODULE,
};
static int tpl0102_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct tpl0102_data *data;
struct iio_dev *indio_dev;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA))
return -EOPNOTSUPP;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->devid = id->driver_data;
data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
if (IS_ERR(data->regmap)) {
dev_err(dev, "regmap initialization failed\n");
return PTR_ERR(data->regmap);
}
indio_dev->dev.parent = dev;
indio_dev->info = &tpl0102_info;
indio_dev->channels = tpl0102_channels;
indio_dev->num_channels = tpl0102_cfg[data->devid].wipers;
indio_dev->name = client->name;
return devm_iio_device_register(dev, indio_dev);
}
static const struct i2c_device_id tpl0102_id[] = {
{ "cat5140-503", CAT5140_503 },
{ "cat5140-104", CAT5140_104 },
{ "tpl0102-104", TPL0102_104 },
{ "tpl0401-103", TPL0401_103 },
{}
};
MODULE_DEVICE_TABLE(i2c, tpl0102_id);
static struct i2c_driver tpl0102_driver = {
.driver = {
.name = "tpl0102",
},
.probe = tpl0102_probe,
.id_table = tpl0102_id,
};
module_i2c_driver(tpl0102_driver);
MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>");
MODULE_DESCRIPTION("TPL0102 digital potentiometer");
MODULE_LICENSE("GPL");
|
