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Message-Id: <20220218042038.15176-6-jagathjog1996@gmail.com>
Date: Fri, 18 Feb 2022 09:50:37 +0530
From: Jagath Jog J <jagathjog1996@...il.com>
To: jic23@...nel.org, lars@...afoo.de, andy.shevchenko@...il.com,
sst@...zta.fm, robh+dt@...nel.org
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 5/6] iio: potentiometer: Add support for Maxim DS3502
The DS3502 is a 7-bit, nonvolatile digital potentiometer featuring
an output voltage range of up to 15.5V.
DS3502 support is implemented into existing DS1803 driver.
Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3502.pdf
Signed-off-by: Jagath Jog J <jagathjog1996@...il.com>
---
drivers/iio/potentiometer/Kconfig | 6 ++--
drivers/iio/potentiometer/ds1803.c | 46 ++++++++++++++++++++++++------
2 files changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
index 832df8da2bc6..79c524640196 100644
--- a/drivers/iio/potentiometer/Kconfig
+++ b/drivers/iio/potentiometer/Kconfig
@@ -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 Devices DS1803 and
+ DS3502 digital potentiometer chip.
To compile this driver as a module, choose M here: the
module will be called ds1803.
diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
index ca28ad147402..ca903e9c2816 100644
--- a/drivers/iio/potentiometer/ds1803.c
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -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>
@@ -18,11 +21,13 @@
#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 {
@@ -36,6 +41,7 @@ struct ds1803_cfg {
struct ds1803_data {
struct i2c_client *client;
const struct ds1803_cfg *cfg;
+ enum ds1803_type chip_type;
};
#define DS1803_CHANNEL(ch, addr) { \
@@ -54,6 +60,10 @@ 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 const struct ds1803_cfg ds1803_cfg[] = {
[DS1803_010] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 10,
.channels = ds1803_channels,
@@ -64,6 +74,9 @@ static const struct ds1803_cfg ds1803_cfg[] = {
[DS1803_100] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100,
.channels = ds1803_channels,
.num_channels = ARRAY_SIZE(ds1803_channels) },
+ [DS3502] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10,
+ .channels = ds3502_channels,
+ .num_channels = ARRAY_SIZE(ds3502_channels) },
};
static int ds1803_read_raw(struct iio_dev *indio_dev,
@@ -77,13 +90,26 @@ static int ds1803_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
- ret = i2c_master_recv(data->client, result,
- indio_dev->num_channels);
- if (ret < 0)
- return ret;
-
- *val = result[pot];
- return IIO_VAL_INT;
+ switch (data->chip_type) {
+ case DS1803_010:
+ case DS1803_050:
+ case DS1803_100:
+ ret = i2c_master_recv(data->client, result,
+ indio_dev->num_channels);
+ if (ret < 0)
+ return ret;
+ *val = result[pot];
+ return IIO_VAL_INT;
+ case DS3502:
+ ret = i2c_smbus_read_byte_data(data->client,
+ chan->address);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
case IIO_CHAN_INFO_SCALE:
*val = 1000 * data->cfg->kohms;
@@ -156,6 +182,7 @@ static int ds1803_probe(struct i2c_client *client, const struct i2c_device_id *i
if (!data->cfg)
data->cfg = &ds1803_cfg[id->driver_data];
+ data->chip_type = id->driver_data;
indio_dev->info = &ds1803_info;
indio_dev->channels = data->cfg->channels;
indio_dev->num_channels = data->cfg->num_channels;
@@ -168,6 +195,7 @@ 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);
@@ -176,6 +204,7 @@ 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);
@@ -192,5 +221,6 @@ static struct i2c_driver ds1803_driver = {
module_i2c_driver(ds1803_driver);
MODULE_AUTHOR("Slawomir Stepien <sst@...zta.fm>");
+MODULE_AUTHOR("Jagath Jog J <jagathjog1996@...il.com>");
MODULE_DESCRIPTION("DS1803 digital potentiometer");
MODULE_LICENSE("GPL v2");
--
2.17.1
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