1 // SPDX-License-Identifier: GPL-2.0+
3 * tpl0102.c - Support for Texas Instruments digital potentiometers
5 * Copyright (C) 2016, 2018
6 * Author: Matt Ranostay <matt.ranostay@konsulko.com>
8 * TODO: enable/disable hi-z output control
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/regmap.h>
14 #include <linux/iio/iio.h>
29 static const struct tpl0102_cfg tpl0102_cfg[] = {
30 /* on-semiconductor parts */
31 [CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
32 [CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
34 [TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
35 [TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
39 struct regmap *regmap;
43 static const struct regmap_config tpl0102_regmap_config = {
48 #define TPL0102_CHANNEL(ch) { \
49 .type = IIO_RESISTANCE, \
53 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
54 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
57 static const struct iio_chan_spec tpl0102_channels[] = {
62 static int tpl0102_read_raw(struct iio_dev *indio_dev,
63 struct iio_chan_spec const *chan,
64 int *val, int *val2, long mask)
66 struct tpl0102_data *data = iio_priv(indio_dev);
69 case IIO_CHAN_INFO_RAW: {
70 int ret = regmap_read(data->regmap, chan->channel, val);
72 return ret ? ret : IIO_VAL_INT;
74 case IIO_CHAN_INFO_SCALE:
75 *val = 1000 * tpl0102_cfg[data->devid].kohms;
76 *val2 = tpl0102_cfg[data->devid].max_pos;
77 return IIO_VAL_FRACTIONAL;
83 static int tpl0102_write_raw(struct iio_dev *indio_dev,
84 struct iio_chan_spec const *chan,
85 int val, int val2, long mask)
87 struct tpl0102_data *data = iio_priv(indio_dev);
89 if (mask != IIO_CHAN_INFO_RAW)
92 if (val >= tpl0102_cfg[data->devid].max_pos || val < 0)
95 return regmap_write(data->regmap, chan->channel, val);
98 static const struct iio_info tpl0102_info = {
99 .read_raw = tpl0102_read_raw,
100 .write_raw = tpl0102_write_raw,
103 static int tpl0102_probe(struct i2c_client *client,
104 const struct i2c_device_id *id)
106 struct device *dev = &client->dev;
107 struct tpl0102_data *data;
108 struct iio_dev *indio_dev;
110 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
113 data = iio_priv(indio_dev);
114 i2c_set_clientdata(client, indio_dev);
116 data->devid = id->driver_data;
117 data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
118 if (IS_ERR(data->regmap)) {
119 dev_err(dev, "regmap initialization failed\n");
120 return PTR_ERR(data->regmap);
123 indio_dev->dev.parent = dev;
124 indio_dev->info = &tpl0102_info;
125 indio_dev->channels = tpl0102_channels;
126 indio_dev->num_channels = tpl0102_cfg[data->devid].wipers;
127 indio_dev->name = client->name;
129 return devm_iio_device_register(dev, indio_dev);
132 static const struct i2c_device_id tpl0102_id[] = {
133 { "cat5140-503", CAT5140_503 },
134 { "cat5140-104", CAT5140_104 },
135 { "tpl0102-104", TPL0102_104 },
136 { "tpl0401-103", TPL0401_103 },
139 MODULE_DEVICE_TABLE(i2c, tpl0102_id);
141 static struct i2c_driver tpl0102_driver = {
145 .probe = tpl0102_probe,
146 .id_table = tpl0102_id,
149 module_i2c_driver(tpl0102_driver);
151 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
152 MODULE_DESCRIPTION("TPL0102 digital potentiometer");
153 MODULE_LICENSE("GPL");