drivers/iio/adc/ad7780.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver
  *
  * Copyright 2011 Analog Devices Inc.
  * Copyright 2019 Renato Lui Geh
  */

 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/spi/spi.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/bits.h>

 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/adc/ad_sigma_delta.h>

 #define AD7780_RDY		BIT(7)
 #define AD7780_FILTER		BIT(6)
 #define AD7780_ERR		BIT(5)
 #define AD7780_ID1		BIT(4)
 #define AD7780_ID0		BIT(3)
 #define AD7780_GAIN		BIT(2)

 #define AD7170_ID		0
 #define AD7171_ID		1
 #define AD7780_ID		1
 #define AD7781_ID		0

 #define AD7780_ID_MASK		(AD7780_ID0 | AD7780_ID1)

 #define AD7780_PATTERN_GOOD	1
 #define AD7780_PATTERN_MASK	GENMASK(1, 0)

 #define AD7170_PATTERN_GOOD	5
 #define AD7170_PATTERN_MASK	GENMASK(2, 0)

 #define AD7780_GAIN_MIDPOINT	64
 #define AD7780_FILTER_MIDPOINT	13350

 static const unsigned int ad778x_gain[2]      = { 1, 128 };
 static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 };

 struct ad7780_chip_info {
 	struct iio_chan_spec	channel;
 	unsigned int		pattern_mask;
 	unsigned int		pattern;
 	bool			is_ad778x;
 };

 struct ad7780_state {
 	const struct ad7780_chip_info	*chip_info;
 	struct regulator		*reg;
 	struct gpio_desc		*powerdown_gpio;
 	struct gpio_desc		*gain_gpio;
 	struct gpio_desc		*filter_gpio;
 	unsigned int			gain;
 	unsigned int			odr;
 	unsigned int			int_vref_mv;

 	struct ad_sigma_delta sd;
 };

 enum ad7780_supported_device_ids {
 	ID_AD7170,
 	ID_AD7171,
 	ID_AD7780,
 	ID_AD7781,
 };

 static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd)
 {
 	return container_of(sd, struct ad7780_state, sd);
 }

 static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta,
 			   enum ad_sigma_delta_mode mode)
 {
 	struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta);
 	unsigned int val;

 	switch (mode) {
 	case AD_SD_MODE_SINGLE:
 	case AD_SD_MODE_CONTINUOUS:
 		val = 1;
 		break;
 	default:
 		val = 0;
 		break;
 	}

 	gpiod_set_value(st->powerdown_gpio, val);

 	return 0;
 }

 static int ad7780_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val,
 			   int *val2,
 			   long m)
 {
 	struct ad7780_state *st = iio_priv(indio_dev);
 	int voltage_uv;

 	switch (m) {
 	case IIO_CHAN_INFO_RAW:
 		return ad_sigma_delta_single_conversion(indio_dev, chan, val);
 	case IIO_CHAN_INFO_SCALE:
 		voltage_uv = regulator_get_voltage(st->reg);
 		if (voltage_uv < 0)
 			return voltage_uv;
 		voltage_uv /= 1000;
 		*val = voltage_uv * st->gain;
 		*val2 = chan->scan_type.realbits - 1;
 		st->int_vref_mv = voltage_uv;
 		return IIO_VAL_FRACTIONAL_LOG2;
 	case IIO_CHAN_INFO_OFFSET:
 		*val = -(1 << (chan->scan_type.realbits - 1));
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		*val = st->odr;
 		return IIO_VAL_INT;
 	default:
 		break;
 	}

 	return -EINVAL;
 }

 static int ad7780_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int val,
 			    int val2,
 			    long m)
 {
 	struct ad7780_state *st = iio_priv(indio_dev);
 	const struct ad7780_chip_info *chip_info = st->chip_info;
 	unsigned long long vref;
 	unsigned int full_scale, gain;

 	if (!chip_info->is_ad778x)
 		return -EINVAL;

 	switch (m) {
 	case IIO_CHAN_INFO_SCALE:
 		if (val != 0)
 			return -EINVAL;

 		vref = st->int_vref_mv * 1000000LL;
 		full_scale = 1 << (chip_info->channel.scan_type.realbits - 1);
 		gain = DIV_ROUND_CLOSEST_ULL(vref, full_scale);
 		gain = DIV_ROUND_CLOSEST(gain, val2);
 		st->gain = gain;
 		if (gain < AD7780_GAIN_MIDPOINT)
 			gain = 0;
 		else
 			gain = 1;
 		gpiod_set_value(st->gain_gpio, gain);
 		break;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT)
 			val = 0;
 		else
 			val = 1;
 		st->odr = ad778x_odr_avail[val];
 		gpiod_set_value(st->filter_gpio, val);
 		break;
 	default:
 		break;
 	}

 	return 0;
 }

 static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
 				     unsigned int raw_sample)
 {
 	struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta);
 	const struct ad7780_chip_info *chip_info = st->chip_info;

 	if ((raw_sample & AD7780_ERR) ||
 	    ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
 		return -EIO;

 	if (chip_info->is_ad778x) {
 		st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
 		st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER];
 	}

 	return 0;
 }

 static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
 	.set_mode = ad7780_set_mode,
 	.postprocess_sample = ad7780_postprocess_sample,
 	.has_registers = false,
 	.irq_flags = IRQF_TRIGGER_FALLING,
 };

 #define _AD7780_CHANNEL(_bits, _wordsize, _mask_all)		\
 {								\
 	.type = IIO_VOLTAGE,					\
 	.indexed = 1,						\
 	.channel = 0,						\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
 		BIT(IIO_CHAN_INFO_OFFSET),			\
 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
 	.info_mask_shared_by_all = _mask_all,			\
 	.scan_index = 1,					\
 	.scan_type = {						\
 		.sign = 'u',					\
 		.realbits = (_bits),				\
 		.storagebits = 32,				\
 		.shift = (_wordsize) - (_bits),			\
 		.endianness = IIO_BE,				\
 	},							\
 }

 #define AD7780_CHANNEL(_bits, _wordsize)	\
 	_AD7780_CHANNEL(_bits, _wordsize, BIT(IIO_CHAN_INFO_SAMP_FREQ))
 #define AD7170_CHANNEL(_bits, _wordsize)	\
 	_AD7780_CHANNEL(_bits, _wordsize, 0)

 static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
 	[ID_AD7170] = {
 		.channel = AD7170_CHANNEL(12, 24),
 		.pattern = AD7170_PATTERN_GOOD,
 		.pattern_mask = AD7170_PATTERN_MASK,
 		.is_ad778x = false,
 	},
 	[ID_AD7171] = {
 		.channel = AD7170_CHANNEL(16, 24),
 		.pattern = AD7170_PATTERN_GOOD,
 		.pattern_mask = AD7170_PATTERN_MASK,
 		.is_ad778x = false,
 	},
 	[ID_AD7780] = {
 		.channel = AD7780_CHANNEL(24, 32),
 		.pattern = AD7780_PATTERN_GOOD,
 		.pattern_mask = AD7780_PATTERN_MASK,
 		.is_ad778x = true,
 	},
 	[ID_AD7781] = {
 		.channel = AD7780_CHANNEL(20, 32),
 		.pattern = AD7780_PATTERN_GOOD,
 		.pattern_mask = AD7780_PATTERN_MASK,
 		.is_ad778x = true,
 	},
 };

 static const struct iio_info ad7780_info = {
 	.read_raw = ad7780_read_raw,
 	.write_raw = ad7780_write_raw,
 };

 static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st)
 {
 	int ret;

 	st->powerdown_gpio = devm_gpiod_get_optional(dev,
 						     "powerdown",
 						     GPIOD_OUT_LOW);
 	if (IS_ERR(st->powerdown_gpio)) {
 		ret = PTR_ERR(st->powerdown_gpio);
 		dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret);
 		return ret;
 	}

 	if (!st->chip_info->is_ad778x)
 		return 0;


 	st->gain_gpio = devm_gpiod_get_optional(dev,
 						"adi,gain",
 						GPIOD_OUT_HIGH);
 	if (IS_ERR(st->gain_gpio)) {
 		ret = PTR_ERR(st->gain_gpio);
 		dev_err(dev, "Failed to request gain GPIO: %d\n", ret);
 		return ret;
 	}

 	st->filter_gpio = devm_gpiod_get_optional(dev,
 						  "adi,filter",
 						  GPIOD_OUT_HIGH);
 	if (IS_ERR(st->filter_gpio)) {
 		ret = PTR_ERR(st->filter_gpio);
 		dev_err(dev, "Failed to request filter GPIO: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static void ad7780_reg_disable(void *reg)
 {
 	regulator_disable(reg);
 }

 static int ad7780_probe(struct spi_device *spi)
 {
 	struct ad7780_state *st;
 	struct iio_dev *indio_dev;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;

 	st = iio_priv(indio_dev);
 	st->gain = 1;

 	ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);

 	st->chip_info =
 		&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];

 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = &st->chip_info->channel;
 	indio_dev->num_channels = 1;
 	indio_dev->info = &ad7780_info;

 	ret = ad7780_init_gpios(&spi->dev, st);
 	if (ret)
 		return ret;

 	st->reg = devm_regulator_get(&spi->dev, "avdd");
 	if (IS_ERR(st->reg))
 		return PTR_ERR(st->reg);

 	ret = regulator_enable(st->reg);
 	if (ret) {
 		dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
 		return ret;
 	}

 	ret = devm_add_action_or_reset(&spi->dev, ad7780_reg_disable, st->reg);
 	if (ret)
 		return ret;

 	ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
 	if (ret)
 		return ret;

 	return devm_iio_device_register(&spi->dev, indio_dev);
 }

 static const struct spi_device_id ad7780_id[] = {
 	{"ad7170", ID_AD7170},
 	{"ad7171", ID_AD7171},
 	{"ad7780", ID_AD7780},
 	{"ad7781", ID_AD7781},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7780_id);

 static struct spi_driver ad7780_driver = {
 	.driver = {
 		.name	= "ad7780",
 	},
 	.probe		= ad7780_probe,
 	.id_table	= ad7780_id,
 };
 module_spi_driver(ad7780_driver);

 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* AD7170/AD7171 and AD7780/AD7781 SPI ADC driver
	*
	* Copyright 2011 Analog Devices Inc.
	* Copyright 2019 Renato Lui Geh
	*/

	#include <linux/interrupt.h>
	#include <linux/device.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/spi/spi.h>
	#include <linux/regulator/consumer.h>
	#include <linux/err.h>
	#include <linux/sched.h>
	#include <linux/gpio/consumer.h>
	#include <linux/module.h>
	#include <linux/bits.h>

	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/iio/adc/ad_sigma_delta.h>

	#define AD7780_RDY BIT(7)
	#define AD7780_FILTER BIT(6)
	#define AD7780_ERR BIT(5)
	#define AD7780_ID1 BIT(4)
	#define AD7780_ID0 BIT(3)
	#define AD7780_GAIN BIT(2)

	#define AD7170_ID 0
	#define AD7171_ID 1
	#define AD7780_ID 1
	#define AD7781_ID 0

	#define AD7780_ID_MASK (AD7780_ID0 \| AD7780_ID1)

	#define AD7780_PATTERN_GOOD 1
	#define AD7780_PATTERN_MASK GENMASK(1, 0)

	#define AD7170_PATTERN_GOOD 5
	#define AD7170_PATTERN_MASK GENMASK(2, 0)

	#define AD7780_GAIN_MIDPOINT 64
	#define AD7780_FILTER_MIDPOINT 13350

	static const unsigned int ad778x_gain[2] = { 1, 128 };
	static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 };

	struct ad7780_chip_info {
	struct iio_chan_spec channel;
	unsigned int pattern_mask;
	unsigned int pattern;
	bool is_ad778x;
	};

	struct ad7780_state {
	const struct ad7780_chip_info *chip_info;
	struct regulator *reg;
	struct gpio_desc *powerdown_gpio;
	struct gpio_desc *gain_gpio;
	struct gpio_desc *filter_gpio;
	unsigned int gain;
	unsigned int odr;
	unsigned int int_vref_mv;

	struct ad_sigma_delta sd;
	};

	enum ad7780_supported_device_ids {
	ID_AD7170,
	ID_AD7171,
	ID_AD7780,
	ID_AD7781,
	};

	static struct ad7780_state ad_sigma_delta_to_ad7780(struct ad_sigma_delta sd)
	{
	return container_of(sd, struct ad7780_state, sd);
	}

	static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta,
	enum ad_sigma_delta_mode mode)
	{
	struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta);
	unsigned int val;

	switch (mode) {
	case AD_SD_MODE_SINGLE:
	case AD_SD_MODE_CONTINUOUS:
	val = 1;
	break;
	default:
	val = 0;
	break;
	}

	gpiod_set_value(st->powerdown_gpio, val);

	return 0;
	}

	static int ad7780_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int *val,
	int *val2,
	long m)
	{
	struct ad7780_state *st = iio_priv(indio_dev);
	int voltage_uv;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
	return ad_sigma_delta_single_conversion(indio_dev, chan, val);
	case IIO_CHAN_INFO_SCALE:
	voltage_uv = regulator_get_voltage(st->reg);
	if (voltage_uv < 0)
	return voltage_uv;
	voltage_uv /= 1000;
	val = voltage_uv st->gain;
	*val2 = chan->scan_type.realbits - 1;
	st->int_vref_mv = voltage_uv;
	return IIO_VAL_FRACTIONAL_LOG2;
	case IIO_CHAN_INFO_OFFSET:
	*val = -(1 << (chan->scan_type.realbits - 1));
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_SAMP_FREQ:
	*val = st->odr;
	return IIO_VAL_INT;
	default:
	break;
	}

	return -EINVAL;
	}

	static int ad7780_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val,
	int val2,
	long m)
	{
	struct ad7780_state *st = iio_priv(indio_dev);
	const struct ad7780_chip_info *chip_info = st->chip_info;
	unsigned long long vref;
	unsigned int full_scale, gain;

	if (!chip_info->is_ad778x)
	return -EINVAL;

	switch (m) {
	case IIO_CHAN_INFO_SCALE:
	if (val != 0)
	return -EINVAL;

	vref = st->int_vref_mv * 1000000LL;
	full_scale = 1 << (chip_info->channel.scan_type.realbits - 1);
	gain = DIV_ROUND_CLOSEST_ULL(vref, full_scale);
	gain = DIV_ROUND_CLOSEST(gain, val2);
	st->gain = gain;
	if (gain < AD7780_GAIN_MIDPOINT)
	gain = 0;
	else
	gain = 1;
	gpiod_set_value(st->gain_gpio, gain);
	break;
	case IIO_CHAN_INFO_SAMP_FREQ:
	if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT)
	val = 0;
	else
	val = 1;
	st->odr = ad778x_odr_avail[val];
	gpiod_set_value(st->filter_gpio, val);
	break;
	default:
	break;
	}

	return 0;
	}

	static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
	unsigned int raw_sample)
	{
	struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta);
	const struct ad7780_chip_info *chip_info = st->chip_info;

	if ((raw_sample & AD7780_ERR) \|\|
	((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
	return -EIO;

	if (chip_info->is_ad778x) {
	st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
	st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER];
	}

	return 0;
	}

	static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
	.set_mode = ad7780_set_mode,
	.postprocess_sample = ad7780_postprocess_sample,
	.has_registers = false,
	.irq_flags = IRQF_TRIGGER_FALLING,
	};

	#define _AD7780_CHANNEL(_bits, _wordsize, _mask_all) \
	{ \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.channel = 0, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \| \
	BIT(IIO_CHAN_INFO_OFFSET), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = _mask_all, \
	.scan_index = 1, \
	.scan_type = { \
	.sign = 'u', \
	.realbits = (_bits), \
	.storagebits = 32, \
	.shift = (_wordsize) - (_bits), \
	.endianness = IIO_BE, \
	}, \
	}

	#define AD7780_CHANNEL(_bits, _wordsize) \
	_AD7780_CHANNEL(_bits, _wordsize, BIT(IIO_CHAN_INFO_SAMP_FREQ))
	#define AD7170_CHANNEL(_bits, _wordsize) \
	_AD7780_CHANNEL(_bits, _wordsize, 0)

	static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
	[ID_AD7170] = {
	.channel = AD7170_CHANNEL(12, 24),
	.pattern = AD7170_PATTERN_GOOD,
	.pattern_mask = AD7170_PATTERN_MASK,
	.is_ad778x = false,
	},
	[ID_AD7171] = {
	.channel = AD7170_CHANNEL(16, 24),
	.pattern = AD7170_PATTERN_GOOD,
	.pattern_mask = AD7170_PATTERN_MASK,
	.is_ad778x = false,
	},
	[ID_AD7780] = {
	.channel = AD7780_CHANNEL(24, 32),
	.pattern = AD7780_PATTERN_GOOD,
	.pattern_mask = AD7780_PATTERN_MASK,
	.is_ad778x = true,
	},
	[ID_AD7781] = {
	.channel = AD7780_CHANNEL(20, 32),
	.pattern = AD7780_PATTERN_GOOD,
	.pattern_mask = AD7780_PATTERN_MASK,
	.is_ad778x = true,
	},
	};

	static const struct iio_info ad7780_info = {
	.read_raw = ad7780_read_raw,
	.write_raw = ad7780_write_raw,
	};

	static int ad7780_init_gpios(struct device dev, struct ad7780_state st)
	{
	int ret;

	st->powerdown_gpio = devm_gpiod_get_optional(dev,
	"powerdown",
	GPIOD_OUT_LOW);
	if (IS_ERR(st->powerdown_gpio)) {
	ret = PTR_ERR(st->powerdown_gpio);
	dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret);
	return ret;
	}

	if (!st->chip_info->is_ad778x)
	return 0;


	st->gain_gpio = devm_gpiod_get_optional(dev,
	"adi,gain",
	GPIOD_OUT_HIGH);
	if (IS_ERR(st->gain_gpio)) {
	ret = PTR_ERR(st->gain_gpio);
	dev_err(dev, "Failed to request gain GPIO: %d\n", ret);
	return ret;
	}

	st->filter_gpio = devm_gpiod_get_optional(dev,
	"adi,filter",
	GPIOD_OUT_HIGH);
	if (IS_ERR(st->filter_gpio)) {
	ret = PTR_ERR(st->filter_gpio);
	dev_err(dev, "Failed to request filter GPIO: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static void ad7780_reg_disable(void *reg)
	{
	regulator_disable(reg);
	}

	static int ad7780_probe(struct spi_device *spi)
	{
	struct ad7780_state *st;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	if (!indio_dev)
	return -ENOMEM;

	st = iio_priv(indio_dev);
	st->gain = 1;

	ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);

	st->chip_info =
	&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];

	indio_dev->name = spi_get_device_id(spi)->name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = &st->chip_info->channel;
	indio_dev->num_channels = 1;
	indio_dev->info = &ad7780_info;

	ret = ad7780_init_gpios(&spi->dev, st);
	if (ret)
	return ret;

	st->reg = devm_regulator_get(&spi->dev, "avdd");
	if (IS_ERR(st->reg))
	return PTR_ERR(st->reg);

	ret = regulator_enable(st->reg);
	if (ret) {
	dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
	return ret;
	}

	ret = devm_add_action_or_reset(&spi->dev, ad7780_reg_disable, st->reg);
	if (ret)
	return ret;

	ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
	if (ret)
	return ret;

	return devm_iio_device_register(&spi->dev, indio_dev);
	}

	static const struct spi_device_id ad7780_id[] = {
	{"ad7170", ID_AD7170},
	{"ad7171", ID_AD7171},
	{"ad7780", ID_AD7780},
	{"ad7781", ID_AD7781},
	{}
	};
	MODULE_DEVICE_TABLE(spi, ad7780_id);

	static struct spi_driver ad7780_driver = {
	.driver = {
	.name = "ad7780",
	},
	.probe = ad7780_probe,
	.id_table = ad7780_id,
	};
	module_spi_driver(ad7780_driver);

	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs");
	MODULE_LICENSE("GPL v2");