summaryrefslogtreecommitdiff
path: root/drivers/iio/potentiometer/ds1803.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iio/potentiometer/ds1803.c')
-rw-r--r--drivers/iio/potentiometer/ds1803.c169
1 files changed, 133 insertions, 36 deletions
diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
index 20b45407eaac..5c212ed7a931 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>
@@ -15,24 +18,27 @@
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
+#include <linux/property.h>
-#define DS1803_MAX_POS 255
-#define DS1803_WRITE(chan) (0xa8 | ((chan) + 1))
+#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 {
+ int wipers;
+ int avail[3];
int kohms;
-};
-
-static const struct ds1803_cfg ds1803_cfg[] = {
- [DS1803_010] = { .kohms = 10, },
- [DS1803_050] = { .kohms = 50, },
- [DS1803_100] = { .kohms = 100, },
+ const struct iio_chan_spec *channels;
+ u8 num_channels;
+ int (*read)(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val);
};
struct ds1803_data {
@@ -40,42 +46,110 @@ struct ds1803_data {
const struct ds1803_cfg *cfg;
};
-#define DS1803_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), \
+#define DS1803_CHANNEL(ch, addr) { \
+ .type = IIO_RESISTANCE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = (ch), \
+ .address = (addr), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec ds1803_channels[] = {
- DS1803_CHANNEL(0),
- DS1803_CHANNEL(1),
+ DS1803_CHANNEL(0, DS1803_WIPER_0),
+ DS1803_CHANNEL(1, DS1803_WIPER_1),
};
-static int ds1803_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2, long mask)
+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)
{
struct ds1803_data *data = iio_priv(indio_dev);
- int pot = chan->channel;
int ret;
u8 result[ARRAY_SIZE(ds1803_channels)];
+ ret = i2c_master_recv(data->client, result, indio_dev->num_channels);
+ if (ret < 0)
+ return ret;
+
+ *val = result[chan->channel];
+ 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,
+ .avail = { 0, 1, 255 },
+ .kohms = 10,
+ .channels = ds1803_channels,
+ .num_channels = ARRAY_SIZE(ds1803_channels),
+ .read = ds1803_read,
+ },
+ [DS1803_050] = {
+ .wipers = 2,
+ .avail = { 0, 1, 255 },
+ .kohms = 50,
+ .channels = ds1803_channels,
+ .num_channels = ARRAY_SIZE(ds1803_channels),
+ .read = ds1803_read,
+ },
+ [DS1803_100] = {
+ .wipers = 2,
+ .avail = { 0, 1, 255 },
+ .kohms = 100,
+ .channels = ds1803_channels,
+ .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,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct ds1803_data *data = iio_priv(indio_dev);
+ int ret;
+
switch (mask) {
case IIO_CHAN_INFO_RAW:
- ret = i2c_master_recv(data->client, result,
- indio_dev->num_channels);
+ ret = data->cfg->read(indio_dev, chan, val);
if (ret < 0)
return ret;
- *val = result[pot];
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 1000 * data->cfg->kohms;
- *val2 = DS1803_MAX_POS;
+ *val2 = data->cfg->avail[2]; /* Max wiper position */
return IIO_VAL_FRACTIONAL;
}
@@ -83,34 +157,52 @@ static int ds1803_read_raw(struct iio_dev *indio_dev,
}
static int ds1803_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val, int val2, long mask)
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
{
struct ds1803_data *data = iio_priv(indio_dev);
- int pot = chan->channel;
+ u8 addr = chan->address;
+ int max_pos = data->cfg->avail[2];
if (val2 != 0)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
- if (val > DS1803_MAX_POS || val < 0)
+ if (val > max_pos || val < 0)
return -EINVAL;
break;
default:
return -EINVAL;
}
- return i2c_smbus_write_byte_data(data->client, DS1803_WRITE(pot), val);
+ return i2c_smbus_write_byte_data(data->client, addr, val);
+}
+
+static int ds1803_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type,
+ int *length, long mask)
+{
+ struct ds1803_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ *vals = data->cfg->avail;
+ *length = ARRAY_SIZE(data->cfg->avail);
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_RANGE;
+ }
+ return -EINVAL;
}
static const struct iio_info ds1803_info = {
.read_raw = ds1803_read_raw,
.write_raw = ds1803_write_raw,
+ .read_avail = ds1803_read_avail,
};
-static int ds1803_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int ds1803_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct ds1803_data *data;
@@ -124,11 +216,13 @@ static int ds1803_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
data->client = client;
- data->cfg = &ds1803_cfg[id->driver_data];
+ data->cfg = device_get_match_data(dev);
+ if (!data->cfg)
+ data->cfg = &ds1803_cfg[id->driver_data];
indio_dev->info = &ds1803_info;
- indio_dev->channels = ds1803_channels;
- indio_dev->num_channels = ARRAY_SIZE(ds1803_channels);
+ indio_dev->channels = data->cfg->channels;
+ indio_dev->num_channels = data->cfg->num_channels;
indio_dev->name = client->name;
return devm_iio_device_register(dev, indio_dev);
@@ -138,6 +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);
@@ -146,6 +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);
@@ -162,5 +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");
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-11 09:33:18 +0000