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-rw-r--r--drivers/iio/potentiometer/Kconfig105
-rw-r--r--drivers/iio/potentiometer/Makefile14
-rw-r--r--drivers/iio/potentiometer/ad5272.c231
-rw-r--r--drivers/iio/potentiometer/ds1803.c172
-rw-r--r--drivers/iio/potentiometer/max5481.c221
-rw-r--r--drivers/iio/potentiometer/max5487.c159
-rw-r--r--drivers/iio/potentiometer/mcp4018.c193
-rw-r--r--drivers/iio/potentiometer/mcp4131.c493
-rw-r--r--drivers/iio/potentiometer/mcp4531.c406
-rw-r--r--drivers/iio/potentiometer/tpl0102.c153
10 files changed, 2147 insertions, 0 deletions
diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
new file mode 100644
index 000000000..79ec2eba4
--- /dev/null
+++ b/drivers/iio/potentiometer/Kconfig
@@ -0,0 +1,105 @@
+#
+# Potentiometer drivers
+#
+# When adding new entries keep the list in alphabetical order
+
+menu "Digital potentiometers"
+
+config AD5272
+ tristate "Analog Devices AD5272 and similar Digital Potentiometer driver"
+ depends on I2C
+ help
+ Say yes here to build support for the Analog Devices AD5272 and AD5274
+ digital potentiometer chip.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad5272.
+
+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 potentiometer chip.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ds1803.
+
+config MAX5481
+ tristate "Maxim MAX5481-MAX5484 Digital Potentiometer driver"
+ depends on SPI
+ help
+ Say yes here to build support for the Maxim
+ MAX5481, MAX5482, MAX5483, MAX5484 digital potentiometer
+ chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called max5481.
+
+config MAX5487
+ tristate "Maxim MAX5487/MAX5488/MAX5489 Digital Potentiometer driver"
+ depends on SPI
+ help
+ Say yes here to build support for the Maxim
+ MAX5487, MAX5488, MAX5489 digital potentiometer
+ chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called max5487.
+
+config MCP4018
+ tristate "Microchip MCP4017/18/19 Digital Potentiometer driver"
+ depends on I2C
+ help
+ Say yes here to build support for the Microchip
+ MCP4017, MCP4018, MCP4019
+ digital potentiometer chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mcp4018.
+
+config MCP4131
+ tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer driver"
+ depends on SPI
+ help
+ Say yes here to build support for the Microchip
+ MCP4131, MCP4132,
+ MCP4141, MCP4142,
+ MCP4151, MCP4152,
+ MCP4161, MCP4162,
+ MCP4231, MCP4232,
+ MCP4241, MCP4242,
+ MCP4251, MCP4252,
+ MCP4261, MCP4262,
+ digital potentiometer chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mcp4131.
+
+config MCP4531
+ tristate "Microchip MCP45xx/MCP46xx Digital Potentiometer driver"
+ depends on I2C
+ help
+ Say yes here to build support for the Microchip
+ MCP4531, MCP4532, MCP4541, MCP4542,
+ MCP4551, MCP4552, MCP4561, MCP4562,
+ MCP4631, MCP4632, MCP4641, MCP4642,
+ MCP4651, MCP4652, MCP4661, MCP4662
+ digital potentiometer chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mcp4531.
+
+config TPL0102
+ tristate "Texas Instruments digital potentiometer driver"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say yes here to build support for the Texas Instruments
+ TPL0102, TPL0402
+ digital potentiometer chips.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tpl0102.
+
+endmenu
diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
new file mode 100644
index 000000000..4af657883
--- /dev/null
+++ b/drivers/iio/potentiometer/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for industrial I/O potentiometer drivers
+#
+
+# When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_AD5272) += ad5272.o
+obj-$(CONFIG_DS1803) += ds1803.o
+obj-$(CONFIG_MAX5481) += max5481.o
+obj-$(CONFIG_MAX5487) += max5487.o
+obj-$(CONFIG_MCP4018) += mcp4018.o
+obj-$(CONFIG_MCP4131) += mcp4131.o
+obj-$(CONFIG_MCP4531) += mcp4531.o
+obj-$(CONFIG_TPL0102) += tpl0102.o
diff --git a/drivers/iio/potentiometer/ad5272.c b/drivers/iio/potentiometer/ad5272.c
new file mode 100644
index 000000000..154f9a5da
--- /dev/null
+++ b/drivers/iio/potentiometer/ad5272.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Analog Devices AD5272 digital potentiometer driver
+ * Copyright (C) 2018 Phil Reid <preid@electromag.com.au>
+ *
+ * Datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5272_5274.pdf
+ *
+ * DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
+ * ad5272 1 1024 20, 50, 100 01011xx
+ * ad5274 1 256 20, 100 01011xx
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+
+#define AD5272_RDAC_WR 1
+#define AD5272_RDAC_RD 2
+#define AD5272_RESET 4
+#define AD5272_CTL 7
+
+#define AD5272_RDAC_WR_EN BIT(1)
+
+struct ad5272_cfg {
+ int max_pos;
+ int kohms;
+ int shift;
+};
+
+enum ad5272_type {
+ AD5272_020,
+ AD5272_050,
+ AD5272_100,
+ AD5274_020,
+ AD5274_100,
+};
+
+static const struct ad5272_cfg ad5272_cfg[] = {
+ [AD5272_020] = { .max_pos = 1024, .kohms = 20 },
+ [AD5272_050] = { .max_pos = 1024, .kohms = 50 },
+ [AD5272_100] = { .max_pos = 1024, .kohms = 100 },
+ [AD5274_020] = { .max_pos = 256, .kohms = 20, .shift = 2 },
+ [AD5274_100] = { .max_pos = 256, .kohms = 100, .shift = 2 },
+};
+
+struct ad5272_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ const struct ad5272_cfg *cfg;
+ u8 buf[2] ____cacheline_aligned;
+};
+
+static const struct iio_chan_spec ad5272_channel = {
+ .type = IIO_RESISTANCE,
+ .output = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+};
+
+static int ad5272_write(struct ad5272_data *data, int reg, int val)
+{
+ int ret;
+
+ data->buf[0] = (reg << 2) | ((val >> 8) & 0x3);
+ data->buf[1] = (u8)val;
+
+ mutex_lock(&data->lock);
+ ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));
+ mutex_unlock(&data->lock);
+ return ret < 0 ? ret : 0;
+}
+
+static int ad5272_read(struct ad5272_data *data, int reg, int *val)
+{
+ int ret;
+
+ data->buf[0] = reg << 2;
+ data->buf[1] = 0;
+
+ mutex_lock(&data->lock);
+ ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));
+ if (ret < 0)
+ goto error;
+
+ ret = i2c_master_recv(data->client, data->buf, sizeof(data->buf));
+ if (ret < 0)
+ goto error;
+
+ *val = ((data->buf[0] & 0x3) << 8) | data->buf[1];
+ ret = 0;
+error:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int ad5272_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct ad5272_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: {
+ ret = ad5272_read(data, AD5272_RDAC_RD, val);
+ *val = *val >> data->cfg->shift;
+ return ret ? ret : IIO_VAL_INT;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000 * data->cfg->kohms;
+ *val2 = data->cfg->max_pos;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int ad5272_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct ad5272_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_RAW)
+ return -EINVAL;
+
+ if (val >= data->cfg->max_pos || val < 0 || val2)
+ return -EINVAL;
+
+ return ad5272_write(data, AD5272_RDAC_WR, val << data->cfg->shift);
+}
+
+static const struct iio_info ad5272_info = {
+ .read_raw = ad5272_read_raw,
+ .write_raw = ad5272_write_raw,
+};
+
+static int ad5272_reset(struct ad5272_data *data)
+{
+ struct gpio_desc *reset_gpio;
+
+ reset_gpio = devm_gpiod_get_optional(&data->client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ if (reset_gpio) {
+ udelay(1);
+ gpiod_set_value(reset_gpio, 1);
+ } else {
+ ad5272_write(data, AD5272_RESET, 0);
+ }
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
+static int ad5272_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct iio_dev *indio_dev;
+ struct ad5272_data *data;
+ int ret;
+
+ 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;
+ mutex_init(&data->lock);
+ data->cfg = &ad5272_cfg[id->driver_data];
+
+ ret = ad5272_reset(data);
+ if (ret)
+ return ret;
+
+ ret = ad5272_write(data, AD5272_CTL, AD5272_RDAC_WR_EN);
+ if (ret < 0)
+ return -ENODEV;
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &ad5272_info;
+ indio_dev->channels = &ad5272_channel;
+ indio_dev->num_channels = 1;
+ indio_dev->name = client->name;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id ad5272_dt_ids[] = {
+ { .compatible = "adi,ad5272-020", .data = (void *)AD5272_020 },
+ { .compatible = "adi,ad5272-050", .data = (void *)AD5272_050 },
+ { .compatible = "adi,ad5272-100", .data = (void *)AD5272_100 },
+ { .compatible = "adi,ad5274-020", .data = (void *)AD5274_020 },
+ { .compatible = "adi,ad5274-100", .data = (void *)AD5274_100 },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ad5272_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct i2c_device_id ad5272_id[] = {
+ { "ad5272-020", AD5272_020 },
+ { "ad5272-050", AD5272_050 },
+ { "ad5272-100", AD5272_100 },
+ { "ad5274-020", AD5274_020 },
+ { "ad5274-100", AD5274_100 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ad5272_id);
+
+static struct i2c_driver ad5272_driver = {
+ .driver = {
+ .name = "ad5272",
+ .of_match_table = of_match_ptr(ad5272_dt_ids),
+ },
+ .probe = ad5272_probe,
+ .id_table = ad5272_id,
+};
+
+module_i2c_driver(ad5272_driver);
+
+MODULE_AUTHOR("Phil Reid <preid@eletromag.com.au>");
+MODULE_DESCRIPTION("AD5272 digital potentiometer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
new file mode 100644
index 000000000..6bf12c9ec
--- /dev/null
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -0,0 +1,172 @@
+/*
+ * 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[ARRAY_SIZE(ds1803_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,
+};
+
+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");
diff --git a/drivers/iio/potentiometer/max5481.c b/drivers/iio/potentiometer/max5481.c
new file mode 100644
index 000000000..ffe276133
--- /dev/null
+++ b/drivers/iio/potentiometer/max5481.c
@@ -0,0 +1,221 @@
+/*
+ * Maxim Integrated MAX5481-MAX5484 digital potentiometer driver
+ * Copyright 2016 Rockwell Collins
+ *
+ * Datasheet:
+ * http://datasheets.maximintegrated.com/en/ds/MAX5481-MAX5484.pdf
+ *
+ * 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/acpi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/spi/spi.h>
+
+/* write wiper reg */
+#define MAX5481_WRITE_WIPER (0 << 4)
+/* copy wiper reg to NV reg */
+#define MAX5481_COPY_AB_TO_NV (2 << 4)
+/* copy NV reg to wiper reg */
+#define MAX5481_COPY_NV_TO_AB (3 << 4)
+
+#define MAX5481_MAX_POS 1023
+
+enum max5481_variant {
+ max5481,
+ max5482,
+ max5483,
+ max5484,
+};
+
+struct max5481_cfg {
+ int kohms;
+};
+
+static const struct max5481_cfg max5481_cfg[] = {
+ [max5481] = { .kohms = 10, },
+ [max5482] = { .kohms = 50, },
+ [max5483] = { .kohms = 10, },
+ [max5484] = { .kohms = 50, },
+};
+
+struct max5481_data {
+ struct spi_device *spi;
+ const struct max5481_cfg *cfg;
+ u8 msg[3] ____cacheline_aligned;
+};
+
+#define MAX5481_CHANNEL { \
+ .type = IIO_RESISTANCE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = 0, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+}
+
+static const struct iio_chan_spec max5481_channels[] = {
+ MAX5481_CHANNEL,
+};
+
+static int max5481_write_cmd(struct max5481_data *data, u8 cmd, u16 val)
+{
+ struct spi_device *spi = data->spi;
+
+ data->msg[0] = cmd;
+
+ switch (cmd) {
+ case MAX5481_WRITE_WIPER:
+ data->msg[1] = val >> 2;
+ data->msg[2] = (val & 0x3) << 6;
+ return spi_write(spi, data->msg, 3);
+
+ case MAX5481_COPY_AB_TO_NV:
+ case MAX5481_COPY_NV_TO_AB:
+ return spi_write(spi, data->msg, 1);
+
+ default:
+ return -EIO;
+ }
+}
+
+static int max5481_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct max5481_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_SCALE)
+ return -EINVAL;
+
+ *val = 1000 * data->cfg->kohms;
+ *val2 = MAX5481_MAX_POS;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int max5481_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct max5481_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_RAW)
+ return -EINVAL;
+
+ if (val < 0 || val > MAX5481_MAX_POS)
+ return -EINVAL;
+
+ return max5481_write_cmd(data, MAX5481_WRITE_WIPER, val);
+}
+
+static const struct iio_info max5481_info = {
+ .read_raw = max5481_read_raw,
+ .write_raw = max5481_write_raw,
+};
+
+#if defined(CONFIG_OF)
+static const struct of_device_id max5481_match[] = {
+ { .compatible = "maxim,max5481", .data = &max5481_cfg[max5481] },
+ { .compatible = "maxim,max5482", .data = &max5481_cfg[max5482] },
+ { .compatible = "maxim,max5483", .data = &max5481_cfg[max5483] },
+ { .compatible = "maxim,max5484", .data = &max5481_cfg[max5484] },
+ { }
+};
+MODULE_DEVICE_TABLE(of, max5481_match);
+#endif
+
+static int max5481_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ struct max5481_data *data;
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ const struct of_device_id *match;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ dev_set_drvdata(&spi->dev, indio_dev);
+ data = iio_priv(indio_dev);
+
+ data->spi = spi;
+
+ match = of_match_device(of_match_ptr(max5481_match), &spi->dev);
+ if (match)
+ data->cfg = of_device_get_match_data(&spi->dev);
+ else
+ data->cfg = &max5481_cfg[id->driver_data];
+
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ /* variant specific configuration */
+ indio_dev->info = &max5481_info;
+ indio_dev->channels = max5481_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max5481_channels);
+
+ /* restore wiper from NV */
+ ret = max5481_write_cmd(data, MAX5481_COPY_NV_TO_AB, 0);
+ if (ret < 0)
+ return ret;
+
+ return iio_device_register(indio_dev);
+}
+
+static int max5481_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
+ struct max5481_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ /* save wiper reg to NV reg */
+ return max5481_write_cmd(data, MAX5481_COPY_AB_TO_NV, 0);
+}
+
+static const struct spi_device_id max5481_id_table[] = {
+ { "max5481", max5481 },
+ { "max5482", max5482 },
+ { "max5483", max5483 },
+ { "max5484", max5484 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, max5481_id_table);
+
+#if defined(CONFIG_ACPI)
+static const struct acpi_device_id max5481_acpi_match[] = {
+ { "max5481", max5481 },
+ { "max5482", max5482 },
+ { "max5483", max5483 },
+ { "max5484", max5484 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, max5481_acpi_match);
+#endif
+
+static struct spi_driver max5481_driver = {
+ .driver = {
+ .name = "max5481",
+ .of_match_table = of_match_ptr(max5481_match),
+ .acpi_match_table = ACPI_PTR(max5481_acpi_match),
+ },
+ .probe = max5481_probe,
+ .remove = max5481_remove,
+ .id_table = max5481_id_table,
+};
+
+module_spi_driver(max5481_driver);
+
+MODULE_AUTHOR("Maury Anderson <maury.anderson@rockwellcollins.com>");
+MODULE_DESCRIPTION("max5481 SPI driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/potentiometer/max5487.c b/drivers/iio/potentiometer/max5487.c
new file mode 100644
index 000000000..5042d3e09
--- /dev/null
+++ b/drivers/iio/potentiometer/max5487.c
@@ -0,0 +1,159 @@
+/*
+ * max5487.c - Support for MAX5487, MAX5488, MAX5489 digital potentiometers
+ *
+ * Copyright (C) 2016 Cristina-Gabriela Moraru <cristina.moraru09@gmail.com>
+ *
+ * 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/module.h>
+#include <linux/spi/spi.h>
+#include <linux/acpi.h>
+
+#include <linux/iio/sysfs.h>
+#include <linux/iio/iio.h>
+
+#define MAX5487_WRITE_WIPER_A (0x01 << 8)
+#define MAX5487_WRITE_WIPER_B (0x02 << 8)
+
+/* copy both wiper regs to NV regs */
+#define MAX5487_COPY_AB_TO_NV (0x23 << 8)
+/* copy both NV regs to wiper regs */
+#define MAX5487_COPY_NV_TO_AB (0x33 << 8)
+
+#define MAX5487_MAX_POS 255
+
+struct max5487_data {
+ struct spi_device *spi;
+ int kohms;
+};
+
+#define MAX5487_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), \
+}
+
+static const struct iio_chan_spec max5487_channels[] = {
+ MAX5487_CHANNEL(0, MAX5487_WRITE_WIPER_A),
+ MAX5487_CHANNEL(1, MAX5487_WRITE_WIPER_B),
+};
+
+static int max5487_write_cmd(struct spi_device *spi, u16 cmd)
+{
+ return spi_write(spi, (const void *) &cmd, sizeof(u16));
+}
+
+static int max5487_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct max5487_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_SCALE)
+ return -EINVAL;
+
+ *val = 1000 * data->kohms;
+ *val2 = MAX5487_MAX_POS;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int max5487_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct max5487_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_RAW)
+ return -EINVAL;
+
+ if (val < 0 || val > MAX5487_MAX_POS)
+ return -EINVAL;
+
+ return max5487_write_cmd(data->spi, chan->address | val);
+}
+
+static const struct iio_info max5487_info = {
+ .read_raw = max5487_read_raw,
+ .write_raw = max5487_write_raw,
+};
+
+static int max5487_spi_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ struct max5487_data *data;
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ dev_set_drvdata(&spi->dev, indio_dev);
+ data = iio_priv(indio_dev);
+
+ data->spi = spi;
+ data->kohms = id->driver_data;
+
+ indio_dev->info = &max5487_info;
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = max5487_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max5487_channels);
+
+ /* restore both wiper regs from NV regs */
+ ret = max5487_write_cmd(data->spi, MAX5487_COPY_NV_TO_AB);
+ if (ret < 0)
+ return ret;
+
+ return iio_device_register(indio_dev);
+}
+
+static int max5487_spi_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
+
+ iio_device_unregister(indio_dev);
+
+ /* save both wiper regs to NV regs */
+ return max5487_write_cmd(spi, MAX5487_COPY_AB_TO_NV);
+}
+
+static const struct spi_device_id max5487_id[] = {
+ { "MAX5487", 10 },
+ { "MAX5488", 50 },
+ { "MAX5489", 100 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, max5487_id);
+
+static const struct acpi_device_id max5487_acpi_match[] = {
+ { "MAX5487", 10 },
+ { "MAX5488", 50 },
+ { "MAX5489", 100 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, max5487_acpi_match);
+
+static struct spi_driver max5487_driver = {
+ .driver = {
+ .name = "max5487",
+ .acpi_match_table = ACPI_PTR(max5487_acpi_match),
+ },
+ .id_table = max5487_id,
+ .probe = max5487_spi_probe,
+ .remove = max5487_spi_remove
+};
+module_spi_driver(max5487_driver);
+
+MODULE_AUTHOR("Cristina-Gabriela Moraru <cristina.moraru09@gmail.com>");
+MODULE_DESCRIPTION("max5487 SPI driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/potentiometer/mcp4018.c b/drivers/iio/potentiometer/mcp4018.c
new file mode 100644
index 000000000..320a7c929
--- /dev/null
+++ b/drivers/iio/potentiometer/mcp4018.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Industrial I/O driver for Microchip digital potentiometers
+ * Copyright (c) 2018 Axentia Technologies AB
+ * Author: Peter Rosin <peda@axentia.se>
+ *
+ * Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22147a.pdf
+ *
+ * DEVID #Wipers #Positions Resistor Opts (kOhm)
+ * mcp4017 1 128 5, 10, 50, 100
+ * mcp4018 1 128 5, 10, 50, 100
+ * mcp4019 1 128 5, 10, 50, 100
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#define MCP4018_WIPER_MAX 127
+
+struct mcp4018_cfg {
+ int kohms;
+};
+
+enum mcp4018_type {
+ MCP4018_502,
+ MCP4018_103,
+ MCP4018_503,
+ MCP4018_104,
+};
+
+static const struct mcp4018_cfg mcp4018_cfg[] = {
+ [MCP4018_502] = { .kohms = 5, },
+ [MCP4018_103] = { .kohms = 10, },
+ [MCP4018_503] = { .kohms = 50, },
+ [MCP4018_104] = { .kohms = 100, },
+};
+
+struct mcp4018_data {
+ struct i2c_client *client;
+ const struct mcp4018_cfg *cfg;
+};
+
+static const struct iio_chan_spec mcp4018_channel = {
+ .type = IIO_RESISTANCE,
+ .indexed = 1,
+ .output = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+};
+
+static int mcp4018_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct mcp4018_data *data = iio_priv(indio_dev);
+ s32 ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_byte(data->client);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000 * data->cfg->kohms;
+ *val2 = MCP4018_WIPER_MAX;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int mcp4018_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct mcp4018_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (val > MCP4018_WIPER_MAX || val < 0)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return i2c_smbus_write_byte(data->client, val);
+}
+
+static const struct iio_info mcp4018_info = {
+ .read_raw = mcp4018_read_raw,
+ .write_raw = mcp4018_write_raw,
+};
+
+static const struct i2c_device_id mcp4018_id[] = {
+ { "mcp4017-502", MCP4018_502 },
+ { "mcp4017-103", MCP4018_103 },
+ { "mcp4017-503", MCP4018_503 },
+ { "mcp4017-104", MCP4018_104 },
+ { "mcp4018-502", MCP4018_502 },
+ { "mcp4018-103", MCP4018_103 },
+ { "mcp4018-503", MCP4018_503 },
+ { "mcp4018-104", MCP4018_104 },
+ { "mcp4019-502", MCP4018_502 },
+ { "mcp4019-103", MCP4018_103 },
+ { "mcp4019-503", MCP4018_503 },
+ { "mcp4019-104", MCP4018_104 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mcp4018_id);
+
+#ifdef CONFIG_OF
+
+#define MCP4018_COMPATIBLE(of_compatible, cfg) { \
+ .compatible = of_compatible, \
+ .data = &mcp4018_cfg[cfg], \
+}
+
+static const struct of_device_id mcp4018_of_match[] = {
+ MCP4018_COMPATIBLE("microchip,mcp4017-502", MCP4018_502),
+ MCP4018_COMPATIBLE("microchip,mcp4017-103", MCP4018_103),
+ MCP4018_COMPATIBLE("microchip,mcp4017-503", MCP4018_503),
+ MCP4018_COMPATIBLE("microchip,mcp4017-104", MCP4018_104),
+ MCP4018_COMPATIBLE("microchip,mcp4018-502", MCP4018_502),
+ MCP4018_COMPATIBLE("microchip,mcp4018-103", MCP4018_103),
+ MCP4018_COMPATIBLE("microchip,mcp4018-503", MCP4018_503),
+ MCP4018_COMPATIBLE("microchip,mcp4018-104", MCP4018_104),
+ MCP4018_COMPATIBLE("microchip,mcp4019-502", MCP4018_502),
+ MCP4018_COMPATIBLE("microchip,mcp4019-103", MCP4018_103),
+ MCP4018_COMPATIBLE("microchip,mcp4019-503", MCP4018_503),
+ MCP4018_COMPATIBLE("microchip,mcp4019-104", MCP4018_104),
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mcp4018_of_match);
+
+#endif
+
+static int mcp4018_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct mcp4018_data *data;
+ struct iio_dev *indio_dev;
+ const struct of_device_id *match;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE)) {
+ dev_err(dev, "SMBUS Byte transfers not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ match = of_match_device(of_match_ptr(mcp4018_of_match), dev);
+ if (match)
+ data->cfg = of_device_get_match_data(dev);
+ else
+ data->cfg = &mcp4018_cfg[i2c_match_id(mcp4018_id, client)->driver_data];
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &mcp4018_info;
+ indio_dev->channels = &mcp4018_channel;
+ indio_dev->num_channels = 1;
+ indio_dev->name = client->name;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct i2c_driver mcp4018_driver = {
+ .driver = {
+ .name = "mcp4018",
+ .of_match_table = of_match_ptr(mcp4018_of_match),
+ },
+ .probe_new = mcp4018_probe,
+ .id_table = mcp4018_id,
+};
+
+module_i2c_driver(mcp4018_driver);
+
+MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
+MODULE_DESCRIPTION("MCP4018 digital potentiometer");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c
new file mode 100644
index 000000000..b3e30db24
--- /dev/null
+++ b/drivers/iio/potentiometer/mcp4131.c
@@ -0,0 +1,493 @@
+/*
+ * Industrial I/O driver for Microchip digital potentiometers
+ *
+ * Copyright (c) 2016 Slawomir Stepien
+ * Based on: Peter Rosin's code from mcp4531.c
+ *
+ * Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
+ *
+ * DEVID #Wipers #Positions Resistor Opts (kOhm)
+ * mcp4131 1 129 5, 10, 50, 100
+ * mcp4132 1 129 5, 10, 50, 100
+ * mcp4141 1 129 5, 10, 50, 100
+ * mcp4142 1 129 5, 10, 50, 100
+ * mcp4151 1 257 5, 10, 50, 100
+ * mcp4152 1 257 5, 10, 50, 100
+ * mcp4161 1 257 5, 10, 50, 100
+ * mcp4162 1 257 5, 10, 50, 100
+ * mcp4231 2 129 5, 10, 50, 100
+ * mcp4232 2 129 5, 10, 50, 100
+ * mcp4241 2 129 5, 10, 50, 100
+ * mcp4242 2 129 5, 10, 50, 100
+ * mcp4251 2 257 5, 10, 50, 100
+ * mcp4252 2 257 5, 10, 50, 100
+ * mcp4261 2 257 5, 10, 50, 100
+ * mcp4262 2 257 5, 10, 50, 100
+ *
+ * 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.
+ */
+
+/*
+ * TODO:
+ * 1. Write wiper setting to EEPROM for EEPROM capable models.
+ */
+
+#include <linux/cache.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+#define MCP4131_WRITE (0x00 << 2)
+#define MCP4131_READ (0x03 << 2)
+
+#define MCP4131_WIPER_SHIFT 4
+#define MCP4131_CMDERR(r) ((r[0]) & 0x02)
+#define MCP4131_RAW(r) ((r[0]) == 0xff ? 0x100 : (r[1]))
+
+struct mcp4131_cfg {
+ int wipers;
+ int max_pos;
+ int kohms;
+};
+
+enum mcp4131_type {
+ MCP413x_502 = 0,
+ MCP413x_103,
+ MCP413x_503,
+ MCP413x_104,
+ MCP414x_502,
+ MCP414x_103,
+ MCP414x_503,
+ MCP414x_104,
+ MCP415x_502,
+ MCP415x_103,
+ MCP415x_503,
+ MCP415x_104,
+ MCP416x_502,
+ MCP416x_103,
+ MCP416x_503,
+ MCP416x_104,
+ MCP423x_502,
+ MCP423x_103,
+ MCP423x_503,
+ MCP423x_104,
+ MCP424x_502,
+ MCP424x_103,
+ MCP424x_503,
+ MCP424x_104,
+ MCP425x_502,
+ MCP425x_103,
+ MCP425x_503,
+ MCP425x_104,
+ MCP426x_502,
+ MCP426x_103,
+ MCP426x_503,
+ MCP426x_104,
+};
+
+static const struct mcp4131_cfg mcp4131_cfg[] = {
+ [MCP413x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
+ [MCP413x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
+ [MCP413x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
+ [MCP413x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
+ [MCP414x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
+ [MCP414x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
+ [MCP414x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
+ [MCP414x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
+ [MCP415x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
+ [MCP415x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
+ [MCP415x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
+ [MCP415x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
+ [MCP416x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
+ [MCP416x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
+ [MCP416x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
+ [MCP416x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
+ [MCP423x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
+ [MCP423x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
+ [MCP423x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
+ [MCP423x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
+ [MCP424x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
+ [MCP424x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
+ [MCP424x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
+ [MCP424x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
+ [MCP425x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
+ [MCP425x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
+ [MCP425x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
+ [MCP425x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
+ [MCP426x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
+ [MCP426x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
+ [MCP426x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
+ [MCP426x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
+};
+
+struct mcp4131_data {
+ struct spi_device *spi;
+ const struct mcp4131_cfg *cfg;
+ struct mutex lock;
+ u8 buf[2] ____cacheline_aligned;
+};
+
+#define MCP4131_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 mcp4131_channels[] = {
+ MCP4131_CHANNEL(0),
+ MCP4131_CHANNEL(1),
+};
+
+static int mcp4131_read(struct spi_device *spi, void *buf, size_t len)
+{
+ struct spi_transfer t = {
+ .tx_buf = buf, /* We need to send addr, cmd and 12 bits */
+ .rx_buf = buf,
+ .len = len,
+ };
+ struct spi_message m;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&t, &m);
+
+ return spi_sync(spi, &m);
+}
+
+static int mcp4131_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int err;
+ struct mcp4131_data *data = iio_priv(indio_dev);
+ int address = chan->channel;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->lock);
+
+ data->buf[0] = (address << MCP4131_WIPER_SHIFT) | MCP4131_READ;
+ data->buf[1] = 0;
+
+ err = mcp4131_read(data->spi, data->buf, 2);
+ if (err) {
+ mutex_unlock(&data->lock);
+ return err;
+ }
+
+ /* Error, bad address/command combination */
+ if (!MCP4131_CMDERR(data->buf)) {
+ mutex_unlock(&data->lock);
+ return -EIO;
+ }
+
+ *val = MCP4131_RAW(data->buf);
+ mutex_unlock(&data->lock);
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000 * data->cfg->kohms;
+ *val2 = data->cfg->max_pos;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int mcp4131_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ int err;
+ struct mcp4131_data *data = iio_priv(indio_dev);
+ int address = chan->channel << MCP4131_WIPER_SHIFT;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (val > data->cfg->max_pos || val < 0)
+ return -EINVAL;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ mutex_lock(&data->lock);
+
+ data->buf[0] = address << MCP4131_WIPER_SHIFT;
+ data->buf[0] |= MCP4131_WRITE | (val >> 8);
+ data->buf[1] = val & 0xFF; /* 8 bits here */
+
+ err = spi_write(data->spi, data->buf, 2);
+ mutex_unlock(&data->lock);
+
+ return err;
+}
+
+static const struct iio_info mcp4131_info = {
+ .read_raw = mcp4131_read_raw,
+ .write_raw = mcp4131_write_raw,
+};
+
+static int mcp4131_probe(struct spi_device *spi)
+{
+ int err;
+ struct device *dev = &spi->dev;
+ unsigned long devid = spi_get_device_id(spi)->driver_data;
+ struct mcp4131_data *data;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ spi_set_drvdata(spi, indio_dev);
+ data->spi = spi;
+ data->cfg = &mcp4131_cfg[devid];
+
+ mutex_init(&data->lock);
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &mcp4131_info;
+ indio_dev->channels = mcp4131_channels;
+ indio_dev->num_channels = data->cfg->wipers;
+ indio_dev->name = spi_get_device_id(spi)->name;
+
+ err = devm_iio_device_register(dev, indio_dev);
+ if (err) {
+ dev_info(&spi->dev, "Unable to register %s\n", indio_dev->name);
+ return err;
+ }
+
+ return 0;
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id mcp4131_dt_ids[] = {
+ { .compatible = "microchip,mcp4131-502",
+ .data = &mcp4131_cfg[MCP413x_502] },
+ { .compatible = "microchip,mcp4131-103",
+ .data = &mcp4131_cfg[MCP413x_103] },
+ { .compatible = "microchip,mcp4131-503",
+ .data = &mcp4131_cfg[MCP413x_503] },
+ { .compatible = "microchip,mcp4131-104",
+ .data = &mcp4131_cfg[MCP413x_104] },
+ { .compatible = "microchip,mcp4132-502",
+ .data = &mcp4131_cfg[MCP413x_502] },
+ { .compatible = "microchip,mcp4132-103",
+ .data = &mcp4131_cfg[MCP413x_103] },
+ { .compatible = "microchip,mcp4132-503",
+ .data = &mcp4131_cfg[MCP413x_503] },
+ { .compatible = "microchip,mcp4132-104",
+ .data = &mcp4131_cfg[MCP413x_104] },
+ { .compatible = "microchip,mcp4141-502",
+ .data = &mcp4131_cfg[MCP414x_502] },
+ { .compatible = "microchip,mcp4141-103",
+ .data = &mcp4131_cfg[MCP414x_103] },
+ { .compatible = "microchip,mcp4141-503",
+ .data = &mcp4131_cfg[MCP414x_503] },
+ { .compatible = "microchip,mcp4141-104",
+ .data = &mcp4131_cfg[MCP414x_104] },
+ { .compatible = "microchip,mcp4142-502",
+ .data = &mcp4131_cfg[MCP414x_502] },
+ { .compatible = "microchip,mcp4142-103",
+ .data = &mcp4131_cfg[MCP414x_103] },
+ { .compatible = "microchip,mcp4142-503",
+ .data = &mcp4131_cfg[MCP414x_503] },
+ { .compatible = "microchip,mcp4142-104",
+ .data = &mcp4131_cfg[MCP414x_104] },
+ { .compatible = "microchip,mcp4151-502",
+ .data = &mcp4131_cfg[MCP415x_502] },
+ { .compatible = "microchip,mcp4151-103",
+ .data = &mcp4131_cfg[MCP415x_103] },
+ { .compatible = "microchip,mcp4151-503",
+ .data = &mcp4131_cfg[MCP415x_503] },
+ { .compatible = "microchip,mcp4151-104",
+ .data = &mcp4131_cfg[MCP415x_104] },
+ { .compatible = "microchip,mcp4152-502",
+ .data = &mcp4131_cfg[MCP415x_502] },
+ { .compatible = "microchip,mcp4152-103",
+ .data = &mcp4131_cfg[MCP415x_103] },
+ { .compatible = "microchip,mcp4152-503",
+ .data = &mcp4131_cfg[MCP415x_503] },
+ { .compatible = "microchip,mcp4152-104",
+ .data = &mcp4131_cfg[MCP415x_104] },
+ { .compatible = "microchip,mcp4161-502",
+ .data = &mcp4131_cfg[MCP416x_502] },
+ { .compatible = "microchip,mcp4161-103",
+ .data = &mcp4131_cfg[MCP416x_103] },
+ { .compatible = "microchip,mcp4161-503",
+ .data = &mcp4131_cfg[MCP416x_503] },
+ { .compatible = "microchip,mcp4161-104",
+ .data = &mcp4131_cfg[MCP416x_104] },
+ { .compatible = "microchip,mcp4162-502",
+ .data = &mcp4131_cfg[MCP416x_502] },
+ { .compatible = "microchip,mcp4162-103",
+ .data = &mcp4131_cfg[MCP416x_103] },
+ { .compatible = "microchip,mcp4162-503",
+ .data = &mcp4131_cfg[MCP416x_503] },
+ { .compatible = "microchip,mcp4162-104",
+ .data = &mcp4131_cfg[MCP416x_104] },
+ { .compatible = "microchip,mcp4231-502",
+ .data = &mcp4131_cfg[MCP423x_502] },
+ { .compatible = "microchip,mcp4231-103",
+ .data = &mcp4131_cfg[MCP423x_103] },
+ { .compatible = "microchip,mcp4231-503",
+ .data = &mcp4131_cfg[MCP423x_503] },
+ { .compatible = "microchip,mcp4231-104",
+ .data = &mcp4131_cfg[MCP423x_104] },
+ { .compatible = "microchip,mcp4232-502",
+ .data = &mcp4131_cfg[MCP423x_502] },
+ { .compatible = "microchip,mcp4232-103",
+ .data = &mcp4131_cfg[MCP423x_103] },
+ { .compatible = "microchip,mcp4232-503",
+ .data = &mcp4131_cfg[MCP423x_503] },
+ { .compatible = "microchip,mcp4232-104",
+ .data = &mcp4131_cfg[MCP423x_104] },
+ { .compatible = "microchip,mcp4241-502",
+ .data = &mcp4131_cfg[MCP424x_502] },
+ { .compatible = "microchip,mcp4241-103",
+ .data = &mcp4131_cfg[MCP424x_103] },
+ { .compatible = "microchip,mcp4241-503",
+ .data = &mcp4131_cfg[MCP424x_503] },
+ { .compatible = "microchip,mcp4241-104",
+ .data = &mcp4131_cfg[MCP424x_104] },
+ { .compatible = "microchip,mcp4242-502",
+ .data = &mcp4131_cfg[MCP424x_502] },
+ { .compatible = "microchip,mcp4242-103",
+ .data = &mcp4131_cfg[MCP424x_103] },
+ { .compatible = "microchip,mcp4242-503",
+ .data = &mcp4131_cfg[MCP424x_503] },
+ { .compatible = "microchip,mcp4242-104",
+ .data = &mcp4131_cfg[MCP424x_104] },
+ { .compatible = "microchip,mcp4251-502",
+ .data = &mcp4131_cfg[MCP425x_502] },
+ { .compatible = "microchip,mcp4251-103",
+ .data = &mcp4131_cfg[MCP425x_103] },
+ { .compatible = "microchip,mcp4251-503",
+ .data = &mcp4131_cfg[MCP425x_503] },
+ { .compatible = "microchip,mcp4251-104",
+ .data = &mcp4131_cfg[MCP425x_104] },
+ { .compatible = "microchip,mcp4252-502",
+ .data = &mcp4131_cfg[MCP425x_502] },
+ { .compatible = "microchip,mcp4252-103",
+ .data = &mcp4131_cfg[MCP425x_103] },
+ { .compatible = "microchip,mcp4252-503",
+ .data = &mcp4131_cfg[MCP425x_503] },
+ { .compatible = "microchip,mcp4252-104",
+ .data = &mcp4131_cfg[MCP425x_104] },
+ { .compatible = "microchip,mcp4261-502",
+ .data = &mcp4131_cfg[MCP426x_502] },
+ { .compatible = "microchip,mcp4261-103",
+ .data = &mcp4131_cfg[MCP426x_103] },
+ { .compatible = "microchip,mcp4261-503",
+ .data = &mcp4131_cfg[MCP426x_503] },
+ { .compatible = "microchip,mcp4261-104",
+ .data = &mcp4131_cfg[MCP426x_104] },
+ { .compatible = "microchip,mcp4262-502",
+ .data = &mcp4131_cfg[MCP426x_502] },
+ { .compatible = "microchip,mcp4262-103",
+ .data = &mcp4131_cfg[MCP426x_103] },
+ { .compatible = "microchip,mcp4262-503",
+ .data = &mcp4131_cfg[MCP426x_503] },
+ { .compatible = "microchip,mcp4262-104",
+ .data = &mcp4131_cfg[MCP426x_104] },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mcp4131_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct spi_device_id mcp4131_id[] = {
+ { "mcp4131-502", MCP413x_502 },
+ { "mcp4131-103", MCP413x_103 },
+ { "mcp4131-503", MCP413x_503 },
+ { "mcp4131-104", MCP413x_104 },
+ { "mcp4132-502", MCP413x_502 },
+ { "mcp4132-103", MCP413x_103 },
+ { "mcp4132-503", MCP413x_503 },
+ { "mcp4132-104", MCP413x_104 },
+ { "mcp4141-502", MCP414x_502 },
+ { "mcp4141-103", MCP414x_103 },
+ { "mcp4141-503", MCP414x_503 },
+ { "mcp4141-104", MCP414x_104 },
+ { "mcp4142-502", MCP414x_502 },
+ { "mcp4142-103", MCP414x_103 },
+ { "mcp4142-503", MCP414x_503 },
+ { "mcp4142-104", MCP414x_104 },
+ { "mcp4151-502", MCP415x_502 },
+ { "mcp4151-103", MCP415x_103 },
+ { "mcp4151-503", MCP415x_503 },
+ { "mcp4151-104", MCP415x_104 },
+ { "mcp4152-502", MCP415x_502 },
+ { "mcp4152-103", MCP415x_103 },
+ { "mcp4152-503", MCP415x_503 },
+ { "mcp4152-104", MCP415x_104 },
+ { "mcp4161-502", MCP416x_502 },
+ { "mcp4161-103", MCP416x_103 },
+ { "mcp4161-503", MCP416x_503 },
+ { "mcp4161-104", MCP416x_104 },
+ { "mcp4162-502", MCP416x_502 },
+ { "mcp4162-103", MCP416x_103 },
+ { "mcp4162-503", MCP416x_503 },
+ { "mcp4162-104", MCP416x_104 },
+ { "mcp4231-502", MCP423x_502 },
+ { "mcp4231-103", MCP423x_103 },
+ { "mcp4231-503", MCP423x_503 },
+ { "mcp4231-104", MCP423x_104 },
+ { "mcp4232-502", MCP423x_502 },
+ { "mcp4232-103", MCP423x_103 },
+ { "mcp4232-503", MCP423x_503 },
+ { "mcp4232-104", MCP423x_104 },
+ { "mcp4241-502", MCP424x_502 },
+ { "mcp4241-103", MCP424x_103 },
+ { "mcp4241-503", MCP424x_503 },
+ { "mcp4241-104", MCP424x_104 },
+ { "mcp4242-502", MCP424x_502 },
+ { "mcp4242-103", MCP424x_103 },
+ { "mcp4242-503", MCP424x_503 },
+ { "mcp4242-104", MCP424x_104 },
+ { "mcp4251-502", MCP425x_502 },
+ { "mcp4251-103", MCP425x_103 },
+ { "mcp4251-503", MCP425x_503 },
+ { "mcp4251-104", MCP425x_104 },
+ { "mcp4252-502", MCP425x_502 },
+ { "mcp4252-103", MCP425x_103 },
+ { "mcp4252-503", MCP425x_503 },
+ { "mcp4252-104", MCP425x_104 },
+ { "mcp4261-502", MCP426x_502 },
+ { "mcp4261-103", MCP426x_103 },
+ { "mcp4261-503", MCP426x_503 },
+ { "mcp4261-104", MCP426x_104 },
+ { "mcp4262-502", MCP426x_502 },
+ { "mcp4262-103", MCP426x_103 },
+ { "mcp4262-503", MCP426x_503 },
+ { "mcp4262-104", MCP426x_104 },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, mcp4131_id);
+
+static struct spi_driver mcp4131_driver = {
+ .driver = {
+ .name = "mcp4131",
+ .of_match_table = of_match_ptr(mcp4131_dt_ids),
+ },
+ .probe = mcp4131_probe,
+ .id_table = mcp4131_id,
+};
+
+module_spi_driver(mcp4131_driver);
+
+MODULE_AUTHOR("Slawomir Stepien <sst@poczta.fm>");
+MODULE_DESCRIPTION("MCP4131 digital potentiometer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
new file mode 100644
index 000000000..df894af6c
--- /dev/null
+++ b/drivers/iio/potentiometer/mcp4531.c
@@ -0,0 +1,406 @@
+/*
+ * Industrial I/O driver for Microchip digital potentiometers
+ * Copyright (c) 2015 Axentia Technologies AB
+ * Author: Peter Rosin <peda@axentia.se>
+ *
+ * Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf
+ *
+ * DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
+ * mcp4531 1 129 5, 10, 50, 100 010111x
+ * mcp4532 1 129 5, 10, 50, 100 01011xx
+ * mcp4541 1 129 5, 10, 50, 100 010111x
+ * mcp4542 1 129 5, 10, 50, 100 01011xx
+ * mcp4551 1 257 5, 10, 50, 100 010111x
+ * mcp4552 1 257 5, 10, 50, 100 01011xx
+ * mcp4561 1 257 5, 10, 50, 100 010111x
+ * mcp4562 1 257 5, 10, 50, 100 01011xx
+ * mcp4631 2 129 5, 10, 50, 100 0101xxx
+ * mcp4632 2 129 5, 10, 50, 100 01011xx
+ * mcp4641 2 129 5, 10, 50, 100 0101xxx
+ * mcp4642 2 129 5, 10, 50, 100 01011xx
+ * mcp4651 2 257 5, 10, 50, 100 0101xxx
+ * mcp4652 2 257 5, 10, 50, 100 01011xx
+ * mcp4661 2 257 5, 10, 50, 100 0101xxx
+ * mcp4662 2 257 5, 10, 50, 100 01011xx
+ *
+ * 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/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <linux/iio/iio.h>
+
+struct mcp4531_cfg {
+ int wipers;
+ int avail[3];
+ int kohms;
+};
+
+enum mcp4531_type {
+ MCP453x_502,
+ MCP453x_103,
+ MCP453x_503,
+ MCP453x_104,
+ MCP454x_502,
+ MCP454x_103,
+ MCP454x_503,
+ MCP454x_104,
+ MCP455x_502,
+ MCP455x_103,
+ MCP455x_503,
+ MCP455x_104,
+ MCP456x_502,
+ MCP456x_103,
+ MCP456x_503,
+ MCP456x_104,
+ MCP463x_502,
+ MCP463x_103,
+ MCP463x_503,
+ MCP463x_104,
+ MCP464x_502,
+ MCP464x_103,
+ MCP464x_503,
+ MCP464x_104,
+ MCP465x_502,
+ MCP465x_103,
+ MCP465x_503,
+ MCP465x_104,
+ MCP466x_502,
+ MCP466x_103,
+ MCP466x_503,
+ MCP466x_104,
+};
+
+static const struct mcp4531_cfg mcp4531_cfg[] = {
+ [MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
+ [MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
+ [MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
+ [MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
+ [MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
+ [MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
+ [MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
+ [MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
+ [MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
+ [MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
+ [MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
+ [MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
+ [MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
+ [MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
+ [MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
+ [MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
+ [MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
+ [MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
+ [MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
+ [MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
+ [MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
+ [MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
+ [MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
+ [MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
+ [MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
+ [MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
+ [MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
+ [MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
+ [MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
+ [MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
+ [MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
+ [MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
+};
+
+#define MCP4531_WRITE (0 << 2)
+#define MCP4531_INCR (1 << 2)
+#define MCP4531_DECR (2 << 2)
+#define MCP4531_READ (3 << 2)
+
+#define MCP4531_WIPER_SHIFT (4)
+
+struct mcp4531_data {
+ struct i2c_client *client;
+ const struct mcp4531_cfg *cfg;
+};
+
+#define MCP4531_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), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
+}
+
+static const struct iio_chan_spec mcp4531_channels[] = {
+ MCP4531_CHANNEL(0),
+ MCP4531_CHANNEL(1),
+};
+
+static int mcp4531_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct mcp4531_data *data = iio_priv(indio_dev);
+ int address = chan->channel << MCP4531_WIPER_SHIFT;
+ s32 ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_word_swapped(data->client,
+ MCP4531_READ | address);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000 * data->cfg->kohms;
+ *val2 = data->cfg->avail[2];
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int mcp4531_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ struct mcp4531_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ *length = ARRAY_SIZE(data->cfg->avail);
+ *vals = data->cfg->avail;
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_RANGE;
+ }
+
+ return -EINVAL;
+}
+
+static int mcp4531_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct mcp4531_data *data = iio_priv(indio_dev);
+ int address = chan->channel << MCP4531_WIPER_SHIFT;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (val > data->cfg->avail[2] || val < 0)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return i2c_smbus_write_byte_data(data->client,
+ MCP4531_WRITE | address | (val >> 8),
+ val & 0xff);
+}
+
+static const struct iio_info mcp4531_info = {
+ .read_raw = mcp4531_read_raw,
+ .read_avail = mcp4531_read_avail,
+ .write_raw = mcp4531_write_raw,
+};
+
+static const struct i2c_device_id mcp4531_id[] = {
+ { "mcp4531-502", MCP453x_502 },
+ { "mcp4531-103", MCP453x_103 },
+ { "mcp4531-503", MCP453x_503 },
+ { "mcp4531-104", MCP453x_104 },
+ { "mcp4532-502", MCP453x_502 },
+ { "mcp4532-103", MCP453x_103 },
+ { "mcp4532-503", MCP453x_503 },
+ { "mcp4532-104", MCP453x_104 },
+ { "mcp4541-502", MCP454x_502 },
+ { "mcp4541-103", MCP454x_103 },
+ { "mcp4541-503", MCP454x_503 },
+ { "mcp4541-104", MCP454x_104 },
+ { "mcp4542-502", MCP454x_502 },
+ { "mcp4542-103", MCP454x_103 },
+ { "mcp4542-503", MCP454x_503 },
+ { "mcp4542-104", MCP454x_104 },
+ { "mcp4551-502", MCP455x_502 },
+ { "mcp4551-103", MCP455x_103 },
+ { "mcp4551-503", MCP455x_503 },
+ { "mcp4551-104", MCP455x_104 },
+ { "mcp4552-502", MCP455x_502 },
+ { "mcp4552-103", MCP455x_103 },
+ { "mcp4552-503", MCP455x_503 },
+ { "mcp4552-104", MCP455x_104 },
+ { "mcp4561-502", MCP456x_502 },
+ { "mcp4561-103", MCP456x_103 },
+ { "mcp4561-503", MCP456x_503 },
+ { "mcp4561-104", MCP456x_104 },
+ { "mcp4562-502", MCP456x_502 },
+ { "mcp4562-103", MCP456x_103 },
+ { "mcp4562-503", MCP456x_503 },
+ { "mcp4562-104", MCP456x_104 },
+ { "mcp4631-502", MCP463x_502 },
+ { "mcp4631-103", MCP463x_103 },
+ { "mcp4631-503", MCP463x_503 },
+ { "mcp4631-104", MCP463x_104 },
+ { "mcp4632-502", MCP463x_502 },
+ { "mcp4632-103", MCP463x_103 },
+ { "mcp4632-503", MCP463x_503 },
+ { "mcp4632-104", MCP463x_104 },
+ { "mcp4641-502", MCP464x_502 },
+ { "mcp4641-103", MCP464x_103 },
+ { "mcp4641-503", MCP464x_503 },
+ { "mcp4641-104", MCP464x_104 },
+ { "mcp4642-502", MCP464x_502 },
+ { "mcp4642-103", MCP464x_103 },
+ { "mcp4642-503", MCP464x_503 },
+ { "mcp4642-104", MCP464x_104 },
+ { "mcp4651-502", MCP465x_502 },
+ { "mcp4651-103", MCP465x_103 },
+ { "mcp4651-503", MCP465x_503 },
+ { "mcp4651-104", MCP465x_104 },
+ { "mcp4652-502", MCP465x_502 },
+ { "mcp4652-103", MCP465x_103 },
+ { "mcp4652-503", MCP465x_503 },
+ { "mcp4652-104", MCP465x_104 },
+ { "mcp4661-502", MCP466x_502 },
+ { "mcp4661-103", MCP466x_103 },
+ { "mcp4661-503", MCP466x_503 },
+ { "mcp4661-104", MCP466x_104 },
+ { "mcp4662-502", MCP466x_502 },
+ { "mcp4662-103", MCP466x_103 },
+ { "mcp4662-503", MCP466x_503 },
+ { "mcp4662-104", MCP466x_104 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mcp4531_id);
+
+#ifdef CONFIG_OF
+
+#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
+ .compatible = of_compatible, \
+ .data = &mcp4531_cfg[cfg], \
+}
+
+static const struct of_device_id mcp4531_of_match[] = {
+ MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104),
+ MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502),
+ MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103),
+ MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503),
+ MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104),
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mcp4531_of_match);
+#endif
+
+static int mcp4531_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct mcp4531_data *data;
+ struct iio_dev *indio_dev;
+ const struct of_device_id *match;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_err(dev, "SMBUS Word Data not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ match = of_match_device(of_match_ptr(mcp4531_of_match), dev);
+ if (match)
+ data->cfg = of_device_get_match_data(dev);
+ else
+ data->cfg = &mcp4531_cfg[i2c_match_id(mcp4531_id, client)->driver_data];
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &mcp4531_info;
+ indio_dev->channels = mcp4531_channels;
+ indio_dev->num_channels = data->cfg->wipers;
+ indio_dev->name = client->name;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct i2c_driver mcp4531_driver = {
+ .driver = {
+ .name = "mcp4531",
+ .of_match_table = of_match_ptr(mcp4531_of_match),
+ },
+ .probe_new = mcp4531_probe,
+ .id_table = mcp4531_id,
+};
+
+module_i2c_driver(mcp4531_driver);
+
+MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
+MODULE_DESCRIPTION("MCP4531 digital potentiometer");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/potentiometer/tpl0102.c b/drivers/iio/potentiometer/tpl0102.c
new file mode 100644
index 000000000..ca1cce58f
--- /dev/null
+++ b/drivers/iio/potentiometer/tpl0102.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * tpl0102.c - Support for Texas Instruments digital potentiometers
+ *
+ * Copyright (C) 2016, 2018
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * TODO: enable/disable hi-z output control
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+
+struct tpl0102_cfg {
+ int wipers;
+ int max_pos;
+ int kohms;
+};
+
+enum tpl0102_type {
+ CAT5140_503,
+ CAT5140_104,
+ TPL0102_104,
+ TPL0401_103,
+};
+
+static const struct tpl0102_cfg tpl0102_cfg[] = {
+ /* on-semiconductor parts */
+ [CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
+ [CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
+ /* ti parts */
+ [TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
+ [TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
+};
+
+struct tpl0102_data {
+ struct regmap *regmap;
+ unsigned long devid;
+};
+
+static const struct regmap_config tpl0102_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+#define TPL0102_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 tpl0102_channels[] = {
+ TPL0102_CHANNEL(0),
+ TPL0102_CHANNEL(1),
+};
+
+static int tpl0102_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct tpl0102_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: {
+ int ret = regmap_read(data->regmap, chan->channel, val);
+
+ return ret ? ret : IIO_VAL_INT;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000 * tpl0102_cfg[data->devid].kohms;
+ *val2 = tpl0102_cfg[data->devid].max_pos;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int tpl0102_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct tpl0102_data *data = iio_priv(indio_dev);
+
+ if (mask != IIO_CHAN_INFO_RAW)
+ return -EINVAL;
+
+ if (val >= tpl0102_cfg[data->devid].max_pos || val < 0)
+ return -EINVAL;
+
+ return regmap_write(data->regmap, chan->channel, val);
+}
+
+static const struct iio_info tpl0102_info = {
+ .read_raw = tpl0102_read_raw,
+ .write_raw = tpl0102_write_raw,
+};
+
+static int tpl0102_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct tpl0102_data *data;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+
+ data->devid = id->driver_data;
+ data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "regmap initialization failed\n");
+ return PTR_ERR(data->regmap);
+ }
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &tpl0102_info;
+ indio_dev->channels = tpl0102_channels;
+ indio_dev->num_channels = tpl0102_cfg[data->devid].wipers;
+ indio_dev->name = client->name;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct i2c_device_id tpl0102_id[] = {
+ { "cat5140-503", CAT5140_503 },
+ { "cat5140-104", CAT5140_104 },
+ { "tpl0102-104", TPL0102_104 },
+ { "tpl0401-103", TPL0401_103 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, tpl0102_id);
+
+static struct i2c_driver tpl0102_driver = {
+ .driver = {
+ .name = "tpl0102",
+ },
+ .probe = tpl0102_probe,
+ .id_table = tpl0102_id,
+};
+
+module_i2c_driver(tpl0102_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("TPL0102 digital potentiometer");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 10:31:33 +0000