Commit 5214ad6d authored by Peter Rosin's avatar Peter Rosin Committed by Jonathan Cameron
Browse files

iio: potentiometer: mcp4018: driver for Microchip digital potentiometers 

Add support for Microchip digital potentiometers and rheostats
	MCP4017, MCP4018, MCP4019

They all have one wiper with 128 steps and come in 5, 10, 50 and 100 kOhm
variations.

Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22147a.pdf



Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d90f2140

MAINTAINERS

+2 −1
Original line number Diff line number Diff line
@@ -8586,11 +8586,12 @@ W: https://linuxtv.org 
S:	Maintained

F:	drivers/media/radio/radio-maxiradio*



MCP4531 MICROCHIP DIGITAL POTENTIOMETER DRIVER

MCP4018 AND MCP4531 MICROCHIP DIGITAL POTENTIOMETER DRIVERS

M:	Peter Rosin <peda@axentia.se>

L:	linux-iio@vger.kernel.org

S:	Maintained

F:	Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531

F:	drivers/iio/potentiometer/mcp4018.c

F:	drivers/iio/potentiometer/mcp4531.c



MEASUREMENT COMPUTING CIO-DAC IIO DRIVER

drivers/iio/potentiometer/Kconfig

+11 −0
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@@ -47,6 +47,17 @@ config MAX5487 
          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

drivers/iio/potentiometer/Makefile

+1 −0
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@@ -8,6 +8,7 @@ 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

drivers/iio/potentiometer/mcp4018.c

0 → 100644
+194 −0
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// 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,

};



#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,

			 const struct i2c_device_id *id)

{

	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[id->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 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);



static struct i2c_driver mcp4018_driver = {

	.driver = {

		.name	= "mcp4018",

		.of_match_table = of_match_ptr(mcp4018_of_match),

	},

	.probe		= 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");

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