forked from Minki/linux
ee2303515e
More concise to have a pointer to tpl0102_cfg struct in the iio_priv data than an integer to an index of an array. Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com> Reviewed-by: Slawomir Stepien <sst@poczta.fm> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* tpl0102.c - Support for Texas Instruments digital potentiometers
|
|
*
|
|
* Copyright (C) 2016, 2018
|
|
* Author: Matt Ranostay <matt.ranostay@konsulko.com>
|
|
*
|
|
* 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;
|
|
const struct tpl0102_cfg *cfg;
|
|
};
|
|
|
|
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 * data->cfg->kohms;
|
|
*val2 = data->cfg->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 >= data->cfg->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,
|
|
};
|
|
|
|
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;
|
|
|
|
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->cfg = &tpl0102_cfg[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 = data->cfg->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 <matt.ranostay@konsulko.com>");
|
|
MODULE_DESCRIPTION("TPL0102 digital potentiometer");
|
|
MODULE_LICENSE("GPL");
|