iio: potentiometer: add driver for Maxim Integrated DS1803

The following functions are supported:
 - write, read potentiometer value
 - potentiometer scale

Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf

Signed-off-by: Slawomir Stepien <sst@poczta.fm>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
new file mode 100644 (file)
index 0000000..df77bf5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
@@ -0,0 +1,21 @@
+* Maxim Integrated DS1803 digital potentiometer driver
+
+The node for this driver must be a child node of a I2C controller, hence
+all mandatory properties for your controller must be specified. See directory:
+
+        Documentation/devicetree/bindings/i2c
+
+for more details.
+
+Required properties:
+       - compatible:   Must be one of the following, depending on the
+                       model:
+                       "maxim,ds1803-010",
+                       "maxim,ds1803-050",
+                       "maxim,ds1803-100"
+
+Example:
+ds1803: ds1803@1 {
+       reg = <0x28>;
+       compatible = "maxim,ds1803-010";
+};

diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
index 7ea069b..6acb238 100644 (file)
--- a/drivers/iio/potentiometer/Kconfig
+++ b/drivers/iio/potentiometer/Kconfig
@@ -5,6 +5,16 @@
 
 menu "Digital potentiometers"
 
+config DS1803
+       tristate "Maxim Integrated DS1803 Digital Potentiometer driver"
+       depends on I2C
+       help
+         Say yes here to build support for the Maxim Integrated DS1803
+         digital potentiomenter chip.
+
+         To compile this driver as a module, choose M here: the
+         module will be called ds1803.
+
 config MCP4131
        tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer driver"
        depends on SPI

diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
index 91a80f8..6007faa 100644 (file)
--- a/drivers/iio/potentiometer/Makefile
+++ b/drivers/iio/potentiometer/Makefile
@@ -3,6 +3,7 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_DS1803) += ds1803.o
 obj-$(CONFIG_MCP4131) += mcp4131.o
 obj-$(CONFIG_MCP4531) += mcp4531.o
 obj-$(CONFIG_TPL0102) += tpl0102.o

diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
new file mode 100644 (file)
index 0000000..fb9e2a3
--- /dev/null
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -0,0 +1,173 @@
+/*
+ * Maxim Integrated DS1803 digital potentiometer driver
+ * Copyright (c) 2016 Slawomir Stepien
+ *
+ * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
+ *
+ * DEVID       #Wipers #Positions      Resistor Opts (kOhm)    i2c address
+ * ds1803      2       256             10, 50, 100             0101xxx
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#define DS1803_MAX_POS         255
+#define DS1803_WRITE(chan)     (0xa8 | ((chan) + 1))
+
+enum ds1803_type {
+       DS1803_010,
+       DS1803_050,
+       DS1803_100,
+};
+
+struct ds1803_cfg {
+       int kohms;
+};
+
+static const struct ds1803_cfg ds1803_cfg[] = {
+       [DS1803_010] = { .kohms =  10, },
+       [DS1803_050] = { .kohms =  50, },
+       [DS1803_100] = { .kohms = 100, },
+};
+
+struct ds1803_data {
+       struct i2c_client *client;
+       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),   \
+}
+
+static const struct iio_chan_spec ds1803_channels[] = {
+       DS1803_CHANNEL(0),
+       DS1803_CHANNEL(1),
+};
+
+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 pot = chan->channel;
+       int ret;
+       u8 result[indio_dev->num_channels];
+
+       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;
+
+       case IIO_CHAN_INFO_SCALE:
+               *val = 1000 * data->cfg->kohms;
+               *val2 = DS1803_MAX_POS;
+               return IIO_VAL_FRACTIONAL;
+       }
+
+       return -EINVAL;
+}
+
+static int ds1803_write_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 pot = chan->channel;
+
+       if (val2 != 0)
+               return -EINVAL;
+
+       switch (mask) {
+       case IIO_CHAN_INFO_RAW:
+               if (val > DS1803_MAX_POS || val < 0)
+                       return -EINVAL;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return i2c_smbus_write_byte_data(data->client, DS1803_WRITE(pot), val);
+}
+
+static const struct iio_info ds1803_info = {
+       .read_raw = ds1803_read_raw,
+       .write_raw = ds1803_write_raw,
+       .driver_module = THIS_MODULE,
+};
+
+static int ds1803_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct device *dev = &client->dev;
+       struct ds1803_data *data;
+       struct iio_dev *indio_dev;
+
+       indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+       if (!indio_dev)
+               return -ENOMEM;
+
+       i2c_set_clientdata(client, indio_dev);
+
+       data = iio_priv(indio_dev);
+       data->client = client;
+       data->cfg = &ds1803_cfg[id->driver_data];
+
+       indio_dev->dev.parent = dev;
+       indio_dev->info = &ds1803_info;
+       indio_dev->channels = ds1803_channels;
+       indio_dev->num_channels = ARRAY_SIZE(ds1803_channels);
+       indio_dev->name = client->name;
+
+       return devm_iio_device_register(dev, indio_dev);
+}
+
+#if defined(CONFIG_OF)
+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] },
+       {}
+};
+MODULE_DEVICE_TABLE(of, ds1803_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct i2c_device_id ds1803_id[] = {
+       { "ds1803-010", DS1803_010 },
+       { "ds1803-050", DS1803_050 },
+       { "ds1803-100", DS1803_100 },
+       {}
+};
+MODULE_DEVICE_TABLE(i2c, ds1803_id);
+
+static struct i2c_driver ds1803_driver = {
+       .driver = {
+               .name   = "ds1803",
+               .of_match_table = of_match_ptr(ds1803_dt_ids),
+       },
+       .probe          = ds1803_probe,
+       .id_table       = ds1803_id,
+};
+
+module_i2c_driver(ds1803_driver);
+
+MODULE_AUTHOR("Slawomir Stepien <sst@poczta.fm>");
+MODULE_DESCRIPTION("DS1803 digital potentiometer");
+MODULE_LICENSE("GPL v2");