@@ -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.
@@ -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,
@@ -199,6 +231,7 @@ 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);
@@ -207,6 +240,7 @@ 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);
@@ -223,5 +257,6 @@ 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");
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> --- drivers/iio/potentiometer/Kconfig | 6 ++--- drivers/iio/potentiometer/ds1803.c | 37 +++++++++++++++++++++++++++++- 2 files changed, 39 insertions(+), 4 deletions(-)