[linux-2.6-block.git] / drivers / iio / potentiometer / mcp4531.c

/*
 * 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,
};

#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,
			 const struct i2c_device_id *id)
{
	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[id->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 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);

static struct i2c_driver mcp4531_driver = {
	.driver = {
		.name	= "mcp4531",
		.of_match_table = of_match_ptr(mcp4531_of_match),
	},
	.probe		= 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");
Commit	Line	Data
c05dc2cc PR	1	/*
	2	* Industrial I/O driver for Microchip digital potentiometers
	3	* Copyright (c) 2015 Axentia Technologies AB
	4	* Author: Peter Rosin <peda@axentia.se>
	5	*
	6	* Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf
	7	*
	8	* DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
	9	* mcp4531 1 129 5, 10, 50, 100 010111x
	10	* mcp4532 1 129 5, 10, 50, 100 01011xx
294ea6f3 FV	11	* mcp4541 1 129 5, 10, 50, 100 010111x
294ea6f3 FV	12	* mcp4542 1 129 5, 10, 50, 100 01011xx
c05dc2cc PR	13	* mcp4551 1 257 5, 10, 50, 100 010111x
c05dc2cc PR	14	* mcp4552 1 257 5, 10, 50, 100 01011xx
294ea6f3 FV	15	* mcp4561 1 257 5, 10, 50, 100 010111x
294ea6f3 FV	16	* mcp4562 1 257 5, 10, 50, 100 01011xx
c05dc2cc PR	17	* mcp4631 2 129 5, 10, 50, 100 0101xxx
c05dc2cc PR	18	* mcp4632 2 129 5, 10, 50, 100 01011xx
294ea6f3 FV	19	* mcp4641 2 129 5, 10, 50, 100 0101xxx
294ea6f3 FV	20	* mcp4642 2 129 5, 10, 50, 100 01011xx
c05dc2cc PR	21	* mcp4651 2 257 5, 10, 50, 100 0101xxx
c05dc2cc PR	22	* mcp4652 2 257 5, 10, 50, 100 01011xx
294ea6f3 FV	23	* mcp4661 2 257 5, 10, 50, 100 0101xxx
294ea6f3 FV	24	* mcp4662 2 257 5, 10, 50, 100 01011xx
c05dc2cc PR	25	*
	26	* This program is free software; you can redistribute it and/or modify it
	27	* under the terms of the GNU General Public License version 2 as published by
	28	* the Free Software Foundation.
	29	*/
	30
	31	#include <linux/module.h>
	32	#include <linux/i2c.h>
	33	#include <linux/err.h>
2dc2e189 FV	34	#include <linux/of.h>
2dc2e189 FV	35	#include <linux/of_device.h>
c05dc2cc PR	36
	37	#include <linux/iio/iio.h>
	38
	39	struct mcp4531_cfg {
	40	int wipers;
2704e300	41	int avail[3];
c05dc2cc PR	42	int kohms;
	43	};
	44
	45	enum mcp4531_type {
	46	MCP453x_502,
	47	MCP453x_103,
	48	MCP453x_503,
	49	MCP453x_104,
294ea6f3 FV	50	MCP454x_502,
	51	MCP454x_103,
	52	MCP454x_503,
	53	MCP454x_104,
c05dc2cc PR	54	MCP455x_502,
	55	MCP455x_103,
	56	MCP455x_503,
	57	MCP455x_104,
294ea6f3 FV	58	MCP456x_502,
	59	MCP456x_103,
	60	MCP456x_503,
	61	MCP456x_104,
c05dc2cc PR	62	MCP463x_502,
	63	MCP463x_103,
	64	MCP463x_503,
	65	MCP463x_104,
294ea6f3 FV	66	MCP464x_502,
	67	MCP464x_103,
	68	MCP464x_503,
	69	MCP464x_104,
c05dc2cc PR	70	MCP465x_502,
	71	MCP465x_103,
	72	MCP465x_503,
	73	MCP465x_104,
294ea6f3 FV	74	MCP466x_502,
	75	MCP466x_103,
	76	MCP466x_503,
	77	MCP466x_104,
c05dc2cc PR	78	};
	79
	80	static const struct mcp4531_cfg mcp4531_cfg[] = {
2704e300 PR	81	[MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
	82	[MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
	83	[MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
	84	[MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
	85	[MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
	86	[MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
	87	[MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
	88	[MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
	89	[MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
	90	[MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
	91	[MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
	92	[MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
	93	[MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
	94	[MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
	95	[MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
	96	[MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
	97	[MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
	98	[MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
	99	[MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
	100	[MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
	101	[MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
	102	[MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
	103	[MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
	104	[MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
	105	[MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
	106	[MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
	107	[MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
	108	[MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
	109	[MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
	110	[MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
	111	[MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
	112	[MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
c05dc2cc PR	113	};
	114
	115	#define MCP4531_WRITE (0 << 2)
	116	#define MCP4531_INCR (1 << 2)
	117	#define MCP4531_DECR (2 << 2)
	118	#define MCP4531_READ (3 << 2)
	119
	120	#define MCP4531_WIPER_SHIFT (4)
	121
	122	struct mcp4531_data {
	123	struct i2c_client *client;
91307cbe	124	const struct mcp4531_cfg *cfg;
c05dc2cc PR	125	};
c05dc2cc PR	126
2704e300 PR	127	#define MCP4531_CHANNEL(ch) { \
	128	.type = IIO_RESISTANCE, \
	129	.indexed = 1, \
	130	.output = 1, \
	131	.channel = (ch), \
	132	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	133	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	134	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
c05dc2cc PR	135	}
	136
	137	static const struct iio_chan_spec mcp4531_channels[] = {
	138	MCP4531_CHANNEL(0),
	139	MCP4531_CHANNEL(1),
	140	};
	141
	142	static int mcp4531_read_raw(struct iio_dev *indio_dev,
	143	struct iio_chan_spec const *chan,
	144	int val, int val2, long mask)
	145	{
	146	struct mcp4531_data *data = iio_priv(indio_dev);
	147	int address = chan->channel << MCP4531_WIPER_SHIFT;
	148	s32 ret;
	149
	150	switch (mask) {
	151	case IIO_CHAN_INFO_RAW:
	152	ret = i2c_smbus_read_word_swapped(data->client,
	153	MCP4531_READ \| address);
	154	if (ret < 0)
	155	return ret;
	156	*val = ret;
	157	return IIO_VAL_INT;
	158	case IIO_CHAN_INFO_SCALE:
91307cbe	159	val = 1000 data->cfg->kohms;
2704e300	160	*val2 = data->cfg->avail[2];
c05dc2cc PR	161	return IIO_VAL_FRACTIONAL;
	162	}
	163
	164	return -EINVAL;
	165	}
	166
2704e300 PR	167	static int mcp4531_read_avail(struct iio_dev *indio_dev,
	168	struct iio_chan_spec const *chan,
	169	const int *vals, int type, int *length,
	170	long mask)
	171	{
	172	struct mcp4531_data *data = iio_priv(indio_dev);
	173
	174	switch (mask) {
	175	case IIO_CHAN_INFO_RAW:
	176	*length = ARRAY_SIZE(data->cfg->avail);
	177	*vals = data->cfg->avail;
	178	*type = IIO_VAL_INT;
	179	return IIO_AVAIL_RANGE;
	180	}
	181
	182	return -EINVAL;
	183	}
	184
c05dc2cc PR	185	static int mcp4531_write_raw(struct iio_dev *indio_dev,
	186	struct iio_chan_spec const *chan,
	187	int val, int val2, long mask)
	188	{
	189	struct mcp4531_data *data = iio_priv(indio_dev);
	190	int address = chan->channel << MCP4531_WIPER_SHIFT;
	191
	192	switch (mask) {
	193	case IIO_CHAN_INFO_RAW:
2704e300	194	if (val > data->cfg->avail[2] \|\| val < 0)
c05dc2cc PR	195	return -EINVAL;
	196	break;
	197	default:
	198	return -EINVAL;
	199	}
	200
	201	return i2c_smbus_write_byte_data(data->client,
	202	MCP4531_WRITE \| address \| (val >> 8),
	203	val & 0xff);
	204	}
	205
	206	static const struct iio_info mcp4531_info = {
	207	.read_raw = mcp4531_read_raw,
2704e300	208	.read_avail = mcp4531_read_avail,
c05dc2cc	209	.write_raw = mcp4531_write_raw,
c05dc2cc PR	210	};
c05dc2cc PR	211
2dc2e189 FV	212	#ifdef CONFIG_OF
	213
	214	#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
	215	.compatible = of_compatible, \
	216	.data = &mcp4531_cfg[cfg], \
	217	}
	218
	219	static const struct of_device_id mcp4531_of_match[] = {
	220	MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
	221	MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
	222	MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
	223	MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104),
	224	MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502),
	225	MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103),
	226	MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503),
	227	MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104),
	228	MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502),
	229	MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103),
	230	MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503),
	231	MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104),
	232	MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502),
	233	MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103),
	234	MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503),
	235	MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104),
	236	MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502),
	237	MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103),
	238	MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503),
	239	MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104),
	240	MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502),
	241	MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103),
	242	MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503),
	243	MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104),
	244	MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502),
	245	MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103),
	246	MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503),
	247	MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104),
	248	MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502),
	249	MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103),
	250	MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503),
	251	MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104),
	252	MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502),
	253	MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103),
	254	MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503),
	255	MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104),
	256	MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502),
	257	MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103),
	258	MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503),
	259	MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104),
	260	MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502),
	261	MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103),
	262	MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503),
	263	MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104),
	264	MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502),
	265	MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103),
	266	MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503),
	267	MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104),
	268	MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502),
	269	MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103),
	270	MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503),
	271	MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104),
	272	MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502),
	273	MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103),
	274	MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503),
	275	MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104),
276	MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502),
277	MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103),
278	MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503),
279	MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104),
280	MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502),
281	MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103),
282	MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503),
283	MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104),
284	{ /* sentinel */ }
285	};
9c6e4efd	286	MODULE_DEVICE_TABLE(of, mcp4531_of_match);
2dc2e189 FV	287	#endif
2dc2e189 FV	288
c05dc2cc PR	289	static int mcp4531_probe(struct i2c_client *client,
	290	const struct i2c_device_id *id)
	291	{
	292	struct device *dev = &client->dev;
c05dc2cc PR	293	struct mcp4531_data *data;
c05dc2cc PR	294	struct iio_dev *indio_dev;
2dc2e189	295	const struct of_device_id *match;
c05dc2cc PR	296
	297	if (!i2c_check_functionality(client->adapter,
	298	I2C_FUNC_SMBUS_WORD_DATA)) {
	299	dev_err(dev, "SMBUS Word Data not supported\n");
f8d9d3b4	300	return -EOPNOTSUPP;
c05dc2cc PR	301	}
	302
	303	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
	304	if (!indio_dev)
	305	return -ENOMEM;
	306	data = iio_priv(indio_dev);
	307	i2c_set_clientdata(client, indio_dev);
	308	data->client = client;
2dc2e189 FV	309
	310	match = of_match_device(of_match_ptr(mcp4531_of_match), dev);
	311	if (match)
	312	data->cfg = of_device_get_match_data(dev);
	313	else
	314	data->cfg = &mcp4531_cfg[id->driver_data];
c05dc2cc PR	315
	316	indio_dev->dev.parent = dev;
	317	indio_dev->info = &mcp4531_info;
	318	indio_dev->channels = mcp4531_channels;
91307cbe	319	indio_dev->num_channels = data->cfg->wipers;
c05dc2cc PR	320	indio_dev->name = client->name;
	321
	322	return devm_iio_device_register(dev, indio_dev);
	323	}
	324
	325	static const struct i2c_device_id mcp4531_id[] = {
	326	{ "mcp4531-502", MCP453x_502 },
	327	{ "mcp4531-103", MCP453x_103 },
	328	{ "mcp4531-503", MCP453x_503 },
	329	{ "mcp4531-104", MCP453x_104 },
	330	{ "mcp4532-502", MCP453x_502 },
	331	{ "mcp4532-103", MCP453x_103 },
	332	{ "mcp4532-503", MCP453x_503 },
	333	{ "mcp4532-104", MCP453x_104 },
294ea6f3 FV	334	{ "mcp4541-502", MCP454x_502 },
	335	{ "mcp4541-103", MCP454x_103 },
	336	{ "mcp4541-503", MCP454x_503 },
	337	{ "mcp4541-104", MCP454x_104 },
	338	{ "mcp4542-502", MCP454x_502 },
	339	{ "mcp4542-103", MCP454x_103 },
	340	{ "mcp4542-503", MCP454x_503 },
	341	{ "mcp4542-104", MCP454x_104 },
c05dc2cc PR	342	{ "mcp4551-502", MCP455x_502 },
	343	{ "mcp4551-103", MCP455x_103 },
	344	{ "mcp4551-503", MCP455x_503 },
	345	{ "mcp4551-104", MCP455x_104 },
	346	{ "mcp4552-502", MCP455x_502 },
	347	{ "mcp4552-103", MCP455x_103 },
	348	{ "mcp4552-503", MCP455x_503 },
	349	{ "mcp4552-104", MCP455x_104 },
294ea6f3 FV	350	{ "mcp4561-502", MCP456x_502 },
	351	{ "mcp4561-103", MCP456x_103 },
	352	{ "mcp4561-503", MCP456x_503 },
	353	{ "mcp4561-104", MCP456x_104 },
	354	{ "mcp4562-502", MCP456x_502 },
	355	{ "mcp4562-103", MCP456x_103 },
	356	{ "mcp4562-503", MCP456x_503 },
	357	{ "mcp4562-104", MCP456x_104 },
c05dc2cc PR	358	{ "mcp4631-502", MCP463x_502 },
	359	{ "mcp4631-103", MCP463x_103 },
	360	{ "mcp4631-503", MCP463x_503 },
	361	{ "mcp4631-104", MCP463x_104 },
	362	{ "mcp4632-502", MCP463x_502 },
	363	{ "mcp4632-103", MCP463x_103 },
	364	{ "mcp4632-503", MCP463x_503 },
	365	{ "mcp4632-104", MCP463x_104 },
294ea6f3 FV	366	{ "mcp4641-502", MCP464x_502 },
	367	{ "mcp4641-103", MCP464x_103 },
	368	{ "mcp4641-503", MCP464x_503 },
	369	{ "mcp4641-104", MCP464x_104 },
	370	{ "mcp4642-502", MCP464x_502 },
	371	{ "mcp4642-103", MCP464x_103 },
	372	{ "mcp4642-503", MCP464x_503 },
	373	{ "mcp4642-104", MCP464x_104 },
c05dc2cc PR	374	{ "mcp4651-502", MCP465x_502 },
	375	{ "mcp4651-103", MCP465x_103 },
	376	{ "mcp4651-503", MCP465x_503 },
	377	{ "mcp4651-104", MCP465x_104 },
	378	{ "mcp4652-502", MCP465x_502 },
	379	{ "mcp4652-103", MCP465x_103 },
	380	{ "mcp4652-503", MCP465x_503 },
	381	{ "mcp4652-104", MCP465x_104 },
294ea6f3 FV	382	{ "mcp4661-502", MCP466x_502 },
	383	{ "mcp4661-103", MCP466x_103 },
	384	{ "mcp4661-503", MCP466x_503 },
	385	{ "mcp4661-104", MCP466x_104 },
	386	{ "mcp4662-502", MCP466x_502 },
	387	{ "mcp4662-103", MCP466x_103 },
	388	{ "mcp4662-503", MCP466x_503 },
	389	{ "mcp4662-104", MCP466x_104 },
c05dc2cc PR	390	{}
	391	};
	392	MODULE_DEVICE_TABLE(i2c, mcp4531_id);
	393
	394	static struct i2c_driver mcp4531_driver = {
	395	.driver = {
	396	.name = "mcp4531",
2dc2e189	397	.of_match_table = of_match_ptr(mcp4531_of_match),
c05dc2cc PR	398	},
	399	.probe = mcp4531_probe,
	400	.id_table = mcp4531_id,
	401	};
	402
	403	module_i2c_driver(mcp4531_driver);
	404
	405	MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
	406	MODULE_DESCRIPTION("MCP4531 digital potentiometer");
	407	MODULE_LICENSE("GPL");