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iio: potentiometer: ds1803: Add support for Maxim DS3502

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The DS3502 is a 7-bit, nonvolatile digital potentiometer featuring
an output voltage range of up to 15.5V. DS3502 support is added
into existing DS1803 driver.

Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3502.pdf
Signed-off-by: Jagath Jog J <jagathjog1996@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220223163525.13399-7-jagathjog1996@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jagath Jog J 2022-02-23 22:05:24 +05:30 committed by Jonathan Cameron
parent 9b68725e90
commit 73c169857c
2 changed files with 39 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/iio/potentiometer/Kconfig
View File

@ -27,11 +27,11 @@ config AD5272
module will be called ad5272.
config DS1803
tristate "Maxim Integrated DS1803 Digital Potentiometer driver"
tristate "Maxim Integrated DS1803 and similar Digital Potentiometer driver"
depends on I2C
help
Say yes here to build support for the Maxim Integrated DS1803
digital potentiometer chip.
Say yes here to build support for the Maxim Integrated DS1803 and
DS3502 digital potentiometer chip.
To compile this driver as a module, choose M here: the
module will be called ds1803.

37
drivers/iio/potentiometer/ds1803.c
View File

@ -1,12 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Maxim Integrated DS1803 digital potentiometer driver
* Maxim Integrated DS1803 and similar digital potentiometer driver
* Copyright (c) 2016 Slawomir Stepien
* Copyright (c) 2022 Jagath Jog J
*
* Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
* Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3502.pdf
*
* DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
* ds1803 2 256 10, 50, 100 0101xxx
* ds3502 1 128 10 01010xx
*/
#include <linux/err.h>
@ -19,11 +22,13 @@
#define DS1803_WIPER_0 0xA9
#define DS1803_WIPER_1 0xAA
#define DS3502_WR_IVR 0x00
enum ds1803_type {
DS1803_010,
DS1803_050,
DS1803_100,
DS3502,
};
struct ds1803_cfg {
@ -57,6 +62,10 @@ static const struct iio_chan_spec ds1803_channels[] = {
DS1803_CHANNEL(1, DS1803_WIPER_1),
};
static const struct iio_chan_spec ds3502_channels[] = {
DS1803_CHANNEL(0, DS3502_WR_IVR),
};
static int ds1803_read(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val)
@ -73,6 +82,21 @@ static int ds1803_read(struct iio_dev *indio_dev,
return ret;
}
static int ds3502_read(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val)
{
struct ds1803_data *data = iio_priv(indio_dev);
int ret;
ret = i2c_smbus_read_byte_data(data->client, chan->address);
if (ret < 0)
return ret;
*val = ret;
return ret;
}
static const struct ds1803_cfg ds1803_cfg[] = {
[DS1803_010] = {
.wipers = 2,
@ -98,6 +122,14 @@ static const struct ds1803_cfg ds1803_cfg[] = {
.num_channels = ARRAY_SIZE(ds1803_channels),
.read = ds1803_read,
},
[DS3502] = {
.wipers = 1,
.avail = { 0, 1, 127 },
.kohms = 10,
.channels = ds3502_channels,
.num_channels = ARRAY_SIZE(ds3502_channels),
.read = ds3502_read,
},
};
static int ds1803_read_raw(struct iio_dev *indio_dev,
@ -200,6 +232,7 @@ static const struct of_device_id ds1803_dt_ids[] = {
{ .compatible = "maxim,ds1803-010", .data = &ds1803_cfg[DS1803_010] },
{ .compatible = "maxim,ds1803-050", .data = &ds1803_cfg[DS1803_050] },
{ .compatible = "maxim,ds1803-100", .data = &ds1803_cfg[DS1803_100] },
{ .compatible = "maxim,ds3502", .data = &ds1803_cfg[DS3502] },
{}
};
MODULE_DEVICE_TABLE(of, ds1803_dt_ids);
@ -208,6 +241,7 @@ static const struct i2c_device_id ds1803_id[] = {
{ "ds1803-010", DS1803_010 },
{ "ds1803-050", DS1803_050 },
{ "ds1803-100", DS1803_100 },
{ "ds3502", DS3502 },
{}
};
MODULE_DEVICE_TABLE(i2c, ds1803_id);
@ -224,5 +258,6 @@ static struct i2c_driver ds1803_driver = {
module_i2c_driver(ds1803_driver);
MODULE_AUTHOR("Slawomir Stepien <sst@poczta.fm>");
MODULE_AUTHOR("Jagath Jog J <jagathjog1996@gmail.com>");
MODULE_DESCRIPTION("DS1803 digital potentiometer");
MODULE_LICENSE("GPL v2");