path: root/drivers/iio/dac/mcp47feb02.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface
 *
 * Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
 *
 * Author: Ariana Lazar <ariana.lazar@microchip.com>
 *
 * Datasheet links:
 * [MCP47FEBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005375A.pdf
 * [MCP47FVBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005405A.pdf
 * [MCP47FxBx4/8] https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP47FXBX48-Data-Sheet-DS200006368A.pdf
 */
#include <linux/array_size.h>
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/time64.h>
#include <linux/types.h>
#include <linux/units.h>

/* Register addresses must be left shifted with 3 positions in order to append command mask */
#define MCP47FEB02_DAC0_REG_ADDR			0x00
#define MCP47FEB02_VREF_REG_ADDR			0x40
#define MCP47FEB02_POWER_DOWN_REG_ADDR			0x48
#define MCP47FEB02_DAC_CTRL_MASK			GENMASK(1, 0)

#define MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR		0x50
#define MCP47FEB02_GAIN_BIT_MASK			BIT(0)
#define MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK		BIT(6)
#define MCP47FEB02_GAIN_BITS_MASK			GENMASK(15, 8)

#define MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR		0x58

#define MCP47FEB02_NV_DAC0_REG_ADDR			0x80
#define MCP47FEB02_NV_VREF_REG_ADDR			0xC0
#define MCP47FEB02_NV_POWER_DOWN_REG_ADDR		0xC8
#define MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR	0xD0
#define MCP47FEB02_NV_I2C_SLAVE_ADDR_MASK		GENMASK(7, 0)

/* Voltage reference, Power-Down control register and DAC Wiperlock status register fields */
#define DAC_CTRL_MASK(ch)				(GENMASK(1, 0) << (2 * (ch)))
#define DAC_CTRL_VAL(ch, val)				((val) << (2 * (ch)))

/* Gain Control and I2C Slave Address Reguster fields */
#define DAC_GAIN_MASK(ch)				(BIT(0) << (8 + (ch)))
#define DAC_GAIN_VAL(ch, val)				((val) << (8 + (ch)))

#define REG_ADDR(reg)					((reg) << 3)
#define NV_REG_ADDR(reg)				((NV_DAC_ADDR_OFFSET + (reg)) << 3)
#define READFLAG_MASK					GENMASK(2, 1)

#define MCP47FEB02_MAX_CH				8
#define MCP47FEB02_MAX_SCALES_CH			3
#define MCP47FEB02_DAC_WIPER_UNLOCKED			0
#define MCP47FEB02_NORMAL_OPERATION			0
#define MCP47FEB02_INTERNAL_BAND_GAP_mV			2440
#define NV_DAC_ADDR_OFFSET				0x10

enum mcp47feb02_vref_mode {
	MCP47FEB02_VREF_VDD = 0,
	MCP47FEB02_INTERNAL_BAND_GAP = 1,
	MCP47FEB02_EXTERNAL_VREF_UNBUFFERED = 2,
	MCP47FEB02_EXTERNAL_VREF_BUFFERED = 3,
};

enum mcp47feb02_scale {
	MCP47FEB02_SCALE_VDD = 0,
	MCP47FEB02_SCALE_GAIN_X1 = 1,
	MCP47FEB02_SCALE_GAIN_X2 = 2,
};

enum mcp47feb02_gain_bit_mode {
	MCP47FEB02_GAIN_BIT_X1 = 0,
	MCP47FEB02_GAIN_BIT_X2 = 1,
};

static const char * const mcp47feb02_powerdown_modes[] = {
	"1kohm_to_gnd",
	"100kohm_to_gnd",
	"open_circuit",
};

/**
 * struct mcp47feb02_features - chip specific data
 * @name: device name
 * @phys_channels: number of hardware channels
 * @resolution: DAC resolution
 * @have_ext_vref1: does the hardware have an the second external voltage reference?
 * @have_eeprom: does the hardware have an internal eeprom?
 */
struct mcp47feb02_features {
	const char *name;
	unsigned int phys_channels;
	unsigned int resolution;
	bool have_ext_vref1;
	bool have_eeprom;
};

static const struct mcp47feb02_features mcp47feb01_chip_features = {
	.name = "mcp47feb01",
	.phys_channels = 1,
	.resolution = 8,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb02_chip_features = {
	.name = "mcp47feb02",
	.phys_channels = 2,
	.resolution = 8,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb04_chip_features = {
	.name = "mcp47feb04",
	.phys_channels = 4,
	.resolution = 8,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb08_chip_features = {
	.name = "mcp47feb08",
	.phys_channels = 8,
	.resolution = 8,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb11_chip_features = {
	.name = "mcp47feb11",
	.phys_channels = 1,
	.resolution = 10,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb12_chip_features = {
	.name = "mcp47feb12",
	.phys_channels = 2,
	.resolution = 10,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb14_chip_features = {
	.name = "mcp47feb14",
	.phys_channels = 4,
	.resolution = 10,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb18_chip_features = {
	.name = "mcp47feb18",
	.phys_channels = 8,
	.resolution = 10,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb21_chip_features = {
	.name = "mcp47feb21",
	.phys_channels = 1,
	.resolution = 12,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb22_chip_features = {
	.name = "mcp47feb22",
	.phys_channels = 2,
	.resolution = 12,
	.have_ext_vref1 = false,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb24_chip_features = {
	.name = "mcp47feb24",
	.phys_channels = 4,
	.resolution = 12,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47feb28_chip_features = {
	.name = "mcp47feb28",
	.phys_channels = 8,
	.resolution = 12,
	.have_ext_vref1 = true,
	.have_eeprom = true,
};

static const struct mcp47feb02_features mcp47fvb01_chip_features = {
	.name = "mcp47fvb01",
	.phys_channels = 1,
	.resolution = 8,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb02_chip_features = {
	.name = "mcp47fvb02",
	.phys_channels = 2,
	.resolution = 8,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb04_chip_features = {
	.name = "mcp47fvb04",
	.phys_channels = 4,
	.resolution = 8,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb08_chip_features = {
	.name = "mcp47fvb08",
	.phys_channels = 8,
	.resolution = 8,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb11_chip_features = {
	.name = "mcp47fvb11",
	.phys_channels = 1,
	.resolution = 10,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb12_chip_features = {
	.name = "mcp47fvb12",
	.phys_channels = 2,
	.resolution = 10,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb14_chip_features = {
	.name = "mcp47fvb14",
	.phys_channels = 4,
	.resolution = 10,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb18_chip_features = {
	.name = "mcp47fvb18",
	.phys_channels = 8,
	.resolution = 10,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb21_chip_features = {
	.name = "mcp47fvb21",
	.phys_channels = 1,
	.resolution = 12,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb22_chip_features = {
	.name = "mcp47fvb22",
	.phys_channels = 2,
	.resolution = 12,
	.have_ext_vref1 = false,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb24_chip_features = {
	.name = "mcp47fvb24",
	.phys_channels = 4,
	.resolution = 12,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

static const struct mcp47feb02_features mcp47fvb28_chip_features = {
	.name = "mcp47fvb28",
	.phys_channels = 8,
	.resolution = 12,
	.have_ext_vref1 = true,
	.have_eeprom = false,
};

/**
 * struct mcp47feb02_channel_data - channel configuration
 * @ref_mode: chosen voltage for reference
 * @use_2x_gain: output driver gain control
 * @powerdown: is false if the channel is in normal operation mode
 * @powerdown_mode: selected power-down mode
 * @dac_data: dac value
 */
struct mcp47feb02_channel_data {
	u8 ref_mode;
	bool use_2x_gain;
	bool powerdown;
	u8 powerdown_mode;
	u16 dac_data;
};

/**
 * struct mcp47feb02_data - chip configuration
 * @chdata: options configured for each channel on the device
 * @lock: prevents concurrent reads/writes to driver's state members
 * @chip_features: pointer to features struct
 * @scale_1: scales set on channels that are based on Vref1
 * @scale: scales set on channels that are based on Vref/Vref0
 * @active_channels_mask: enabled channels
 * @regmap: regmap for directly accessing device register
 * @labels: table with channels labels
 * @phys_channels: physical channels on the device
 * @vref1_buffered: Vref1 buffer is enabled
 * @vref_buffered: Vref/Vref0 buffer is enabled
 * @use_vref1: vref1-supply is defined
 * @use_vref: vref-supply is defined
 */
struct mcp47feb02_data {
	struct mcp47feb02_channel_data chdata[MCP47FEB02_MAX_CH];
	struct mutex lock; /* prevents concurrent reads/writes to driver's state members */
	const struct mcp47feb02_features *chip_features;
	int scale_1[2 * MCP47FEB02_MAX_SCALES_CH];
	int scale[2 * MCP47FEB02_MAX_SCALES_CH];
	unsigned long active_channels_mask;
	struct regmap *regmap;
	const char *labels[MCP47FEB02_MAX_CH];
	u16 phys_channels;
	bool vref1_buffered;
	bool vref_buffered;
	bool use_vref1;
	bool use_vref;
};

static const struct regmap_range mcp47feb02_readable_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
	regmap_reg_range(MCP47FEB02_NV_DAC0_REG_ADDR, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR),
};

static const struct regmap_range mcp47feb02_writable_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
	regmap_reg_range(MCP47FEB02_NV_DAC0_REG_ADDR, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR),
};

static const struct regmap_range mcp47feb02_volatile_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
	regmap_reg_range(MCP47FEB02_NV_DAC0_REG_ADDR, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR),
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
	regmap_reg_range(MCP47FEB02_NV_DAC0_REG_ADDR, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR),
};

static const struct regmap_access_table mcp47feb02_readable_table = {
	.yes_ranges = mcp47feb02_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47feb02_readable_ranges),
};

static const struct regmap_access_table mcp47feb02_writable_table = {
	.yes_ranges = mcp47feb02_writable_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47feb02_writable_ranges),
};

static const struct regmap_access_table mcp47feb02_volatile_table = {
	.yes_ranges = mcp47feb02_volatile_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47feb02_volatile_ranges),
};

static const struct regmap_config mcp47feb02_regmap_config = {
	.name = "mcp47feb02_regmap",
	.reg_bits = 8,
	.val_bits = 16,
	.rd_table = &mcp47feb02_readable_table,
	.wr_table = &mcp47feb02_writable_table,
	.volatile_table = &mcp47feb02_volatile_table,
	.max_register = MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR,
	.read_flag_mask = READFLAG_MASK,
	.cache_type = REGCACHE_MAPLE,
	.val_format_endian = REGMAP_ENDIAN_BIG,
};

/* For devices that doesn't have nonvolatile memory */
static const struct regmap_range mcp47fvb02_readable_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
};

static const struct regmap_range mcp47fvb02_writable_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
};

static const struct regmap_range mcp47fvb02_volatile_ranges[] = {
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
	regmap_reg_range(MCP47FEB02_DAC0_REG_ADDR, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR),
};

static const struct regmap_access_table mcp47fvb02_readable_table = {
	.yes_ranges = mcp47fvb02_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47fvb02_readable_ranges),
};

static const struct regmap_access_table mcp47fvb02_writable_table = {
	.yes_ranges = mcp47fvb02_writable_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47fvb02_writable_ranges),
};

static const struct regmap_access_table mcp47fvb02_volatile_table = {
	.yes_ranges = mcp47fvb02_volatile_ranges,
	.n_yes_ranges = ARRAY_SIZE(mcp47fvb02_volatile_ranges),
};

static const struct regmap_config mcp47fvb02_regmap_config = {
	.name = "mcp47fvb02_regmap",
	.reg_bits = 8,
	.val_bits = 16,
	.rd_table = &mcp47fvb02_readable_table,
	.wr_table = &mcp47fvb02_writable_table,
	.volatile_table = &mcp47fvb02_volatile_table,
	.max_register = MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR,
	.read_flag_mask = READFLAG_MASK,
	.cache_type = REGCACHE_MAPLE,
	.val_format_endian = REGMAP_ENDIAN_BIG,
};

static int mcp47feb02_write_to_eeprom(struct mcp47feb02_data *data, unsigned int reg,
				      unsigned int val)
{
	int eewa_val, ret;

	/*
	 * Wait until the currently occurring EEPROM Write Cycle is completed.
	 * Only serial commands to the volatile memory are allowed.
	 */
	guard(mutex)(&data->lock);

	ret = regmap_read_poll_timeout(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR,
				       eewa_val,
				       !(eewa_val & MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK),
				       USEC_PER_MSEC, USEC_PER_MSEC * 5);
	if (ret)
		return ret;

	return regmap_write(data->regmap, reg, val);
}

static ssize_t store_eeprom_store(struct device *dev, struct device_attribute *attr,
				  const char *buf, size_t len)
{
	struct mcp47feb02_data *data = iio_priv(dev_to_iio_dev(dev));
	unsigned int i, val, val1, eewa_val;
	bool state;
	int ret;

	ret = kstrtobool(buf, &state);
	if (ret)
		return ret;

	if (!state)
		return 0;

	/*
	 * Verify DAC Wiper and DAC Configuration are unlocked. If both are disabled,
	 * writing to EEPROM is available.
	 */
	ret = regmap_read(data->regmap, MCP47FEB02_WIPERLOCK_STATUS_REG_ADDR, &val);
	if (ret)
		return ret;

	if (val) {
		dev_err(dev, "DAC Wiper and DAC Configuration not are unlocked.\n");
		return -EINVAL;
	}

	for_each_set_bit(i, &data->active_channels_mask, data->phys_channels) {
		ret = mcp47feb02_write_to_eeprom(data, NV_REG_ADDR(i),
						 data->chdata[i].dac_data);
		if (ret)
			return ret;
	}

	ret = regmap_read(data->regmap, MCP47FEB02_VREF_REG_ADDR, &val);
	if (ret)
		return ret;

	ret = mcp47feb02_write_to_eeprom(data, MCP47FEB02_NV_VREF_REG_ADDR, val);
	if (ret)
		return ret;

	ret = regmap_read(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR, &val);
	if (ret)
		return ret;

	ret = mcp47feb02_write_to_eeprom(data, MCP47FEB02_NV_POWER_DOWN_REG_ADDR, val);
	if (ret)
		return ret;

	ret = regmap_read_poll_timeout(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR, eewa_val,
				       !(eewa_val & MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK),
				       USEC_PER_MSEC, USEC_PER_MSEC * 5);
	if (ret)
		return ret;

	ret = regmap_read(data->regmap, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR, &val);
	if (ret)
		return ret;

	ret = regmap_read(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR, &val1);
	if (ret)
		return ret;

	ret = mcp47feb02_write_to_eeprom(data, MCP47FEB02_NV_GAIN_CTRL_I2C_SLAVE_REG_ADDR,
					 (val1 & MCP47FEB02_GAIN_BITS_MASK) |
					 (val & MCP47FEB02_NV_I2C_SLAVE_ADDR_MASK));
	if (ret)
		return ret;

	return len;
}

static IIO_DEVICE_ATTR_WO(store_eeprom, 0);

static struct attribute *mcp47feb02_attributes[] = {
	&iio_dev_attr_store_eeprom.dev_attr.attr,
	NULL
};

static const struct attribute_group mcp47feb02_attribute_group = {
	.attrs = mcp47feb02_attributes,
};

static int mcp47feb02_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	int ret;
	u8 ch;

	guard(mutex)(&data->lock);

	for_each_set_bit(ch, &data->active_channels_mask, data->phys_channels) {
		u8 pd_mode;

		data->chdata[ch].powerdown = true;
		pd_mode = data->chdata[ch].powerdown_mode + 1;
		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
		if (ret)
			return ret;

		ret = regmap_write(data->regmap, REG_ADDR(ch), data->chdata[ch].dac_data);
		if (ret)
			return ret;
	}

	return 0;
}

static int mcp47feb02_resume(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	u8 ch;

	guard(mutex)(&data->lock);

	for_each_set_bit(ch, &data->active_channels_mask, data->phys_channels) {
		u8 pd_mode;
		int ret;

		data->chdata[ch].powerdown = false;
		pd_mode = data->chdata[ch].powerdown_mode + 1;

		ret = regmap_write(data->regmap, REG_ADDR(ch), data->chdata[ch].dac_data);
		if (ret)
			return ret;

		ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
		if (ret)
			return ret;

		ret = regmap_update_bits(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR,
					 DAC_GAIN_MASK(ch),
					 DAC_GAIN_VAL(ch, data->chdata[ch].use_2x_gain));
		if (ret)
			return ret;

		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
					 DAC_CTRL_MASK(ch),
					 DAC_CTRL_VAL(ch, MCP47FEB02_NORMAL_OPERATION));
		if (ret)
			return ret;
	}

	return 0;
}

static int mcp47feb02_get_powerdown_mode(struct iio_dev *indio_dev,
					 const struct iio_chan_spec *chan)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);

	return data->chdata[chan->address].powerdown_mode;
}

static int mcp47feb02_set_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *ch,
					 unsigned int mode)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);

	data->chdata[ch->address].powerdown_mode = mode;

	return 0;
}

static ssize_t mcp47feb02_read_powerdown(struct iio_dev *indio_dev, uintptr_t private,
					 const struct iio_chan_spec *ch, char *buf)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);

	/* Print if channel is in a power-down mode or not */
	return sysfs_emit(buf, "%d\n", data->chdata[ch->address].powerdown);
}

static ssize_t mcp47feb02_write_powerdown(struct iio_dev *indio_dev, uintptr_t private,
					  const struct iio_chan_spec *ch, const char *buf,
					  size_t len)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	u32 reg = ch->address;
	u8 tmp_pd_mode;
	bool state;
	int ret;

	guard(mutex)(&data->lock);

	ret = kstrtobool(buf, &state);
	if (ret)
		return ret;

	/*
	 * Set the channel to the specified power-down mode. Exiting power-down mode
	 * requires writing normal operation mode (0) to the channel-specific register bits.
	 */
	tmp_pd_mode = state ? (data->chdata[reg].powerdown_mode + 1) : MCP47FEB02_NORMAL_OPERATION;
	ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
				 DAC_CTRL_MASK(reg), DAC_CTRL_VAL(reg, tmp_pd_mode));
	if (ret)
		return ret;

	data->chdata[reg].powerdown = state;

	return len;
}

static DEFINE_SIMPLE_DEV_PM_OPS(mcp47feb02_pm_ops, mcp47feb02_suspend, mcp47feb02_resume);

static const struct iio_enum mcp47febxx_powerdown_mode_enum = {
	.items = mcp47feb02_powerdown_modes,
	.num_items = ARRAY_SIZE(mcp47feb02_powerdown_modes),
	.get = mcp47feb02_get_powerdown_mode,
	.set = mcp47feb02_set_powerdown_mode,
};

static const struct iio_chan_spec_ext_info mcp47feb02_ext_info[] = {
	{
		.name = "powerdown",
		.read = mcp47feb02_read_powerdown,
		.write = mcp47feb02_write_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &mcp47febxx_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &mcp47febxx_powerdown_mode_enum),
	{ }
};

static const struct iio_chan_spec mcp47febxx_ch_template = {
	.type = IIO_VOLTAGE,
	.output = 1,
	.indexed = 1,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
	.info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE),
	.ext_info = mcp47feb02_ext_info,
};

static void mcp47feb02_init_scale(struct mcp47feb02_data *data, enum mcp47feb02_scale scale,
				  int vref_mV, int scale_avail[])
{
	u32 value_micro, value_int;
	u64 tmp;

	/* vref_mV should not be negative */
	tmp = (u64)vref_mV * MICRO >> data->chip_features->resolution;
	value_int = div_u64_rem(tmp, MICRO, &value_micro);
	scale_avail[scale * 2] = value_int;
	scale_avail[scale * 2 + 1] = value_micro;
}

static int mcp47feb02_init_scales_avail(struct mcp47feb02_data *data, int vdd_mV,
					int vref_mV, int vref1_mV)
{
	struct device *dev = regmap_get_device(data->regmap);
	int tmp_vref;

	mcp47feb02_init_scale(data, MCP47FEB02_SCALE_VDD, vdd_mV, data->scale);

	if (data->use_vref)
		tmp_vref = vref_mV;
	else
		tmp_vref = MCP47FEB02_INTERNAL_BAND_GAP_mV;

	mcp47feb02_init_scale(data, MCP47FEB02_SCALE_GAIN_X1, tmp_vref, data->scale);
	mcp47feb02_init_scale(data, MCP47FEB02_SCALE_GAIN_X2, tmp_vref * 2, data->scale);

	if (data->phys_channels >= 4) {
		mcp47feb02_init_scale(data, MCP47FEB02_SCALE_VDD, vdd_mV, data->scale_1);

		if (data->use_vref1 && vref1_mV <= 0)
			return dev_err_probe(dev, vref1_mV, "Invalid voltage for Vref1\n");

		if (data->use_vref1)
			tmp_vref = vref1_mV;
		else
			tmp_vref = MCP47FEB02_INTERNAL_BAND_GAP_mV;

		mcp47feb02_init_scale(data, MCP47FEB02_SCALE_GAIN_X1,
				      tmp_vref, data->scale_1);
		mcp47feb02_init_scale(data, MCP47FEB02_SCALE_GAIN_X2,
				      tmp_vref * 2, data->scale_1);
	}

	return 0;
}

static int mcp47feb02_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *ch,
				 const int **vals, int *type, int *length, long info)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);

	switch (info) {
	case IIO_CHAN_INFO_SCALE:
		switch (ch->type) {
		case IIO_VOLTAGE:
			if (data->phys_channels >= 4 && (ch->address % 2))
				*vals = data->scale_1;
			else
				*vals = data->scale;

			*length = 2 * MCP47FEB02_MAX_SCALES_CH;
			*type = IIO_VAL_INT_PLUS_MICRO;
			return IIO_AVAIL_LIST;
		default:
			return -EINVAL;
		}
	default:
		return -EINVAL;
	}
}

static void mcp47feb02_get_scale(int ch, struct mcp47feb02_data *data, int *val, int *val2)
{
	enum mcp47feb02_scale current_scale;

	if (data->chdata[ch].ref_mode == MCP47FEB02_VREF_VDD)
		current_scale = MCP47FEB02_SCALE_VDD;
	else if (data->chdata[ch].use_2x_gain)
		current_scale = MCP47FEB02_SCALE_GAIN_X2;
	else
		current_scale = MCP47FEB02_SCALE_GAIN_X1;

	if (data->phys_channels >= 4 && (ch % 2)) {
		*val = data->scale_1[current_scale * 2];
		*val2 = data->scale_1[current_scale * 2 + 1];
	} else {
		*val = data->scale[current_scale * 2];
		*val2 = data->scale[current_scale * 2 + 1];
	}
}

static int mcp47feb02_check_scale(struct mcp47feb02_data *data, int val, int val2, int scale[])
{
	unsigned int i;

	for (i = 0; i < MCP47FEB02_MAX_SCALES_CH; i++) {
		if (scale[i * 2] == val && scale[i * 2 + 1] == val2)
			return i;
	}

	return -EINVAL;
}

static int mcp47feb02_ch_scale(struct mcp47feb02_data *data, int ch, int scale)
{
	int tmp_val, ret;

	if (scale == MCP47FEB02_SCALE_VDD) {
		tmp_val = MCP47FEB02_VREF_VDD;
	} else if (data->phys_channels >= 4 && (ch % 2)) {
		if (data->use_vref1) {
			if (data->vref1_buffered)
				tmp_val = MCP47FEB02_EXTERNAL_VREF_BUFFERED;
			else
				tmp_val = MCP47FEB02_EXTERNAL_VREF_UNBUFFERED;
		} else {
			tmp_val = MCP47FEB02_INTERNAL_BAND_GAP;
		}
	} else if (data->use_vref) {
		if (data->vref_buffered)
			tmp_val = MCP47FEB02_EXTERNAL_VREF_BUFFERED;
		else
			tmp_val = MCP47FEB02_EXTERNAL_VREF_UNBUFFERED;
	} else {
		tmp_val = MCP47FEB02_INTERNAL_BAND_GAP;
	}

	ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
				 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, tmp_val));
	if (ret)
		return ret;

	data->chdata[ch].ref_mode = tmp_val;

	return 0;
}

/*
 * Setting the scale in order to choose between VDD and (Vref or Band Gap) from the user
 * space. The VREF pin is either an input or an output, therefore the user cannot
 * simultaneously connect an external voltage reference to the pin and select the
 * internal Band Gap.
 * When the DAC’s voltage reference is configured as the VREF pin, the pin is an input.
 * When the DAC’s voltage reference is configured as the internal Band Gap,
 * the VREF pin is an output.
 * If Vref/Vref1 voltage is not available, then the internal Band Gap will be used
 * to calculate the values for the scale.
 */
static int mcp47feb02_set_scale(struct mcp47feb02_data *data, int ch, int scale)
{
	int tmp_val, ret;

	ret = mcp47feb02_ch_scale(data, ch, scale);
	if (ret)
		return ret;

	if (scale == MCP47FEB02_SCALE_GAIN_X2)
		tmp_val = MCP47FEB02_GAIN_BIT_X2;
	else
		tmp_val = MCP47FEB02_GAIN_BIT_X1;

	ret = regmap_update_bits(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR,
				 DAC_GAIN_MASK(ch), DAC_GAIN_VAL(ch, tmp_val));
	if (ret)
		return ret;

	data->chdata[ch].use_2x_gain = tmp_val;

	return 0;
}

static int mcp47feb02_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *ch,
			       int *val, int *val2, long mask)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = regmap_read(data->regmap, REG_ADDR(ch->address), val);
		if (ret)
			return ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		mcp47feb02_get_scale(ch->address, data, val, val2);
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static int mcp47feb02_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *ch,
				int val, int val2, long mask)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	int *tmp_scale, ret;

	guard(mutex)(&data->lock);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = regmap_write(data->regmap, REG_ADDR(ch->address), val);
		if (ret)
			return ret;

		data->chdata[ch->address].dac_data = val;
		return 0;
	case IIO_CHAN_INFO_SCALE:
		if (data->phys_channels >= 4 && (ch->address % 2))
			tmp_scale = data->scale_1;
		else
			tmp_scale = data->scale;

		ret = mcp47feb02_check_scale(data, val, val2, tmp_scale);
		if (ret < 0)
			return ret;

		return mcp47feb02_set_scale(data, ch->address, ret);
	default:
		return -EINVAL;
	}
}

static int mcp47feb02_read_label(struct iio_dev *indio_dev, struct iio_chan_spec const *ch,
				 char *label)
{
	struct mcp47feb02_data *data = iio_priv(indio_dev);

	return sysfs_emit(label, "%s\n", data->labels[ch->address]);
}

static const struct iio_info mcp47feb02_info = {
	.read_raw = mcp47feb02_read_raw,
	.write_raw = mcp47feb02_write_raw,
	.read_label = mcp47feb02_read_label,
	.read_avail = &mcp47feb02_read_avail,
	.attrs = &mcp47feb02_attribute_group,
};

static const struct iio_info mcp47fvb02_info = {
	.read_raw = mcp47feb02_read_raw,
	.write_raw = mcp47feb02_write_raw,
	.read_label = mcp47feb02_read_label,
	.read_avail = &mcp47feb02_read_avail,
};

static int mcp47feb02_parse_fw(struct iio_dev *indio_dev,
			       const struct mcp47feb02_features *chip_features)
{
	struct iio_chan_spec chanspec = mcp47febxx_ch_template;
	struct mcp47feb02_data *data = iio_priv(indio_dev);
	struct device *dev = regmap_get_device(data->regmap);
	struct iio_chan_spec *channels;
	u32 num_channels;
	u8 chan_idx = 0;

	guard(mutex)(&data->lock);

	num_channels = device_get_child_node_count(dev);
	if (num_channels > chip_features->phys_channels)
		return dev_err_probe(dev, -EINVAL, "More channels than the chip supports\n");

	if (!num_channels)
		return dev_err_probe(dev, -EINVAL, "No channel specified in the devicetree.\n");

	channels = devm_kcalloc(dev, num_channels, sizeof(*channels), GFP_KERNEL);
	if (!channels)
		return -ENOMEM;

	device_for_each_child_node_scoped(dev, child) {
		u32 reg = 0;
		int ret;

		ret = fwnode_property_read_u32(child, "reg", &reg);
		if (ret)
			return dev_err_probe(dev, ret, "Invalid channel number\n");

		if (reg >= chip_features->phys_channels)
			return dev_err_probe(dev, -EINVAL,
					     "The index of the channels does not match the chip\n");

		set_bit(reg, &data->active_channels_mask);

		ret = fwnode_property_read_string(child, "label", &data->labels[reg]);
		if (ret)
			return dev_err_probe(dev, ret, "%pfw: invalid label\n",
					     fwnode_get_name(child));

		chanspec.address = reg;
		chanspec.channel = reg;
		channels[chan_idx] = chanspec;
		chan_idx++;
	}

	indio_dev->num_channels = num_channels;
	indio_dev->channels = channels;
	indio_dev->modes = INDIO_DIRECT_MODE;
	data->phys_channels = chip_features->phys_channels;

	data->vref_buffered = device_property_read_bool(dev, "microchip,vref-buffered");

	if (chip_features->have_ext_vref1)
		data->vref1_buffered = device_property_read_bool(dev, "microchip,vref1-buffered");

	return 0;
}

static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
{
	unsigned int i, vref_ch, gain_ch, pd_ch;
	int ret;

	ret = regmap_read(data->regmap, MCP47FEB02_VREF_REG_ADDR, &vref_ch);
	if (ret)
		return ret;

	ret = regmap_read(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR, &gain_ch);
	if (ret)
		return ret;

	ret = regmap_read(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR, &pd_ch);
	if (ret)
		return ret;

	gain_ch = gain_ch & MCP47FEB02_GAIN_BITS_MASK;
	for_each_set_bit(i, &data->active_channels_mask, data->phys_channels) {
		struct device *dev = regmap_get_device(data->regmap);
		unsigned int pd_tmp;

		data->chdata[i].ref_mode = (vref_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
		data->chdata[i].use_2x_gain = (gain_ch >> i)  & MCP47FEB02_GAIN_BIT_MASK;

		/*
		 * Inform the user that the current voltage reference read from the volatile
		 * register of the chip is different from the one specified in the device tree.
		 * Considering that the user cannot have an external voltage reference connected
		 * to the pin and select the internal Band Gap at the same time, in order to avoid
		 * miscofiguring the reference voltage, the volatile register will not be written.
		 * In order to overwrite the setting from volatile register with the one from the
		 * device tree, the user needs to write the chosen scale.
		 */
		switch (data->chdata[i].ref_mode) {
		case MCP47FEB02_INTERNAL_BAND_GAP:
			if (data->phys_channels >= 4 && (i % 2) && data->use_vref1) {
				dev_dbg(dev, "ch[%u]: was configured to use internal band gap", i);
				dev_dbg(dev, "ch[%u]: reference voltage set to VREF1", i);
				break;
			}
			if ((data->phys_channels < 4 || (data->phys_channels >= 4 && !(i % 2))) &&
			    data->use_vref) {
				dev_dbg(dev, "ch[%u]: was configured to use internal band gap", i);
				dev_dbg(dev, "ch[%u]: reference voltage set to VREF", i);
				break;
			}
			break;
		case MCP47FEB02_EXTERNAL_VREF_UNBUFFERED:
		case MCP47FEB02_EXTERNAL_VREF_BUFFERED:
			if (data->phys_channels >= 4 && (i % 2) && !data->use_vref1) {
				dev_dbg(dev, "ch[%u]: was configured to use VREF1", i);
				dev_dbg(dev,
					"ch[%u]: reference voltage set to internal band gap", i);
				break;
			}
			if ((data->phys_channels < 4 || (data->phys_channels >= 4 && !(i % 2))) &&
			    !data->use_vref) {
				dev_dbg(dev, "ch[%u]: was configured to use VREF", i);
				dev_dbg(dev,
					"ch[%u]: reference voltage set to internal band gap", i);
				break;
			}
			break;
		}

		pd_tmp = (pd_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
		data->chdata[i].powerdown_mode = pd_tmp ? (pd_tmp - 1) : pd_tmp;
		data->chdata[i].powerdown = !!(data->chdata[i].powerdown_mode);
	}

	return 0;
}

static int mcp47feb02_init_ch_scales(struct mcp47feb02_data *data, int vdd_mV,
				     int vref_mV, int vref1_mV)
{
	unsigned int i;

	for_each_set_bit(i, &data->active_channels_mask, data->phys_channels) {
		struct device *dev = regmap_get_device(data->regmap);
		int ret;

		ret = mcp47feb02_init_scales_avail(data, vdd_mV, vref_mV, vref1_mV);
		if (ret)
			return dev_err_probe(dev, ret, "failed to init scales for ch %u\n", i);
	}

	return 0;
}

static int mcp47feb02_probe(struct i2c_client *client)
{
	const struct mcp47feb02_features *chip_features;
	struct device *dev = &client->dev;
	struct mcp47feb02_data *data;
	struct iio_dev *indio_dev;
	int vref1_mV = 0;
	int vref_mV = 0;
	int vdd_mV;
	int ret;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	chip_features = i2c_get_match_data(client);
	if (!chip_features)
		return -EINVAL;

	data->chip_features = chip_features;

	if (chip_features->have_eeprom) {
		data->regmap = devm_regmap_init_i2c(client, &mcp47feb02_regmap_config);
		indio_dev->info = &mcp47feb02_info;
	} else {
		data->regmap = devm_regmap_init_i2c(client, &mcp47fvb02_regmap_config);
		indio_dev->info = &mcp47fvb02_info;
	}
	if (IS_ERR(data->regmap))
		return dev_err_probe(dev, PTR_ERR(data->regmap), "Error initializing i2c regmap\n");

	indio_dev->name = chip_features->name;

	ret = mcp47feb02_parse_fw(indio_dev, chip_features);
	if (ret)
		return dev_err_probe(dev, ret, "Error parsing firmware data\n");

	ret = devm_mutex_init(dev, &data->lock);
	if (ret)
		return ret;

	ret = devm_regulator_get_enable_read_voltage(dev, "vdd");
	if (ret < 0)
		return ret;

	vdd_mV = ret / MILLI;

	ret = devm_regulator_get_enable_read_voltage(dev, "vref");
	if (ret > 0) {
		vref_mV = ret / MILLI;
		data->use_vref = true;
	} else {
		dev_dbg(dev, "using internal band gap as voltage reference.\n");
		dev_dbg(dev, "Vref is unavailable.\n");
	}

	if (chip_features->have_ext_vref1) {
		ret = devm_regulator_get_enable_read_voltage(dev, "vref1");
		if (ret > 0) {
			vref1_mV = ret / MILLI;
			data->use_vref1 = true;
		} else {
			dev_dbg(dev, "using internal band gap as voltage reference 1.\n");
			dev_dbg(dev, "Vref1 is unavailable.\n");
		}
	}

	ret = mcp47feb02_init_ctrl_regs(data);
	if (ret)
		return dev_err_probe(dev, ret, "Error initialising vref register\n");

	ret = mcp47feb02_init_ch_scales(data, vdd_mV, vref_mV, vref1_mV);
	if (ret)
		return ret;

	return devm_iio_device_register(dev, indio_dev);
}

static const struct i2c_device_id mcp47feb02_id[] = {
	{ "mcp47feb01", (kernel_ulong_t)&mcp47feb01_chip_features },
	{ "mcp47feb02", (kernel_ulong_t)&mcp47feb02_chip_features },
	{ "mcp47feb04", (kernel_ulong_t)&mcp47feb04_chip_features },
	{ "mcp47feb08", (kernel_ulong_t)&mcp47feb08_chip_features },
	{ "mcp47feb11", (kernel_ulong_t)&mcp47feb11_chip_features },
	{ "mcp47feb12", (kernel_ulong_t)&mcp47feb12_chip_features },
	{ "mcp47feb14", (kernel_ulong_t)&mcp47feb14_chip_features },
	{ "mcp47feb18", (kernel_ulong_t)&mcp47feb18_chip_features },
	{ "mcp47feb21", (kernel_ulong_t)&mcp47feb21_chip_features },
	{ "mcp47feb22", (kernel_ulong_t)&mcp47feb22_chip_features },
	{ "mcp47feb24", (kernel_ulong_t)&mcp47feb24_chip_features },
	{ "mcp47feb28", (kernel_ulong_t)&mcp47feb28_chip_features },
	{ "mcp47fvb01", (kernel_ulong_t)&mcp47fvb01_chip_features },
	{ "mcp47fvb02", (kernel_ulong_t)&mcp47fvb02_chip_features },
	{ "mcp47fvb04", (kernel_ulong_t)&mcp47fvb04_chip_features },
	{ "mcp47fvb08", (kernel_ulong_t)&mcp47fvb08_chip_features },
	{ "mcp47fvb11", (kernel_ulong_t)&mcp47fvb11_chip_features },
	{ "mcp47fvb12", (kernel_ulong_t)&mcp47fvb12_chip_features },
	{ "mcp47fvb14", (kernel_ulong_t)&mcp47fvb14_chip_features },
	{ "mcp47fvb18", (kernel_ulong_t)&mcp47fvb18_chip_features },
	{ "mcp47fvb21", (kernel_ulong_t)&mcp47fvb21_chip_features },
	{ "mcp47fvb22", (kernel_ulong_t)&mcp47fvb22_chip_features },
	{ "mcp47fvb24", (kernel_ulong_t)&mcp47fvb24_chip_features },
	{ "mcp47fvb28", (kernel_ulong_t)&mcp47fvb28_chip_features },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mcp47feb02_id);

static const struct of_device_id mcp47feb02_of_match[] = {
	{ .compatible = "microchip,mcp47feb01", .data = &mcp47feb01_chip_features },
	{ .compatible = "microchip,mcp47feb02", .data = &mcp47feb02_chip_features },
	{ .compatible = "microchip,mcp47feb04", .data = &mcp47feb04_chip_features },
	{ .compatible = "microchip,mcp47feb08", .data = &mcp47feb08_chip_features },
	{ .compatible = "microchip,mcp47feb11", .data = &mcp47feb11_chip_features },
	{ .compatible = "microchip,mcp47feb12", .data = &mcp47feb12_chip_features },
	{ .compatible = "microchip,mcp47feb14", .data = &mcp47feb14_chip_features },
	{ .compatible = "microchip,mcp47feb18", .data = &mcp47feb18_chip_features },
	{ .compatible = "microchip,mcp47feb21", .data = &mcp47feb21_chip_features },
	{ .compatible = "microchip,mcp47feb22", .data = &mcp47feb22_chip_features },
	{ .compatible = "microchip,mcp47feb24", .data = &mcp47feb24_chip_features },
	{ .compatible = "microchip,mcp47feb28", .data = &mcp47feb28_chip_features },
	{ .compatible = "microchip,mcp47fvb01", .data = &mcp47fvb01_chip_features },
	{ .compatible = "microchip,mcp47fvb02", .data = &mcp47fvb02_chip_features },
	{ .compatible = "microchip,mcp47fvb04", .data = &mcp47fvb04_chip_features },
	{ .compatible = "microchip,mcp47fvb08", .data = &mcp47fvb08_chip_features },
	{ .compatible = "microchip,mcp47fvb11", .data = &mcp47fvb11_chip_features },
	{ .compatible = "microchip,mcp47fvb12", .data = &mcp47fvb12_chip_features },
	{ .compatible = "microchip,mcp47fvb14",	.data = &mcp47fvb14_chip_features },
	{ .compatible = "microchip,mcp47fvb18", .data = &mcp47fvb18_chip_features },
	{ .compatible = "microchip,mcp47fvb21", .data = &mcp47fvb21_chip_features },
	{ .compatible = "microchip,mcp47fvb22", .data = &mcp47fvb22_chip_features },
	{ .compatible = "microchip,mcp47fvb24", .data = &mcp47fvb24_chip_features },
	{ .compatible = "microchip,mcp47fvb28", .data = &mcp47fvb28_chip_features },
	{ }
};
MODULE_DEVICE_TABLE(of, mcp47feb02_of_match);

static struct i2c_driver mcp47feb02_driver = {
	.driver = {
		.name	= "mcp47feb02",
		.of_match_table = mcp47feb02_of_match,
		.pm	= pm_sleep_ptr(&mcp47feb02_pm_ops),
	},
	.probe		= mcp47feb02_probe,
	.id_table	= mcp47feb02_id,
};
module_i2c_driver(mcp47feb02_driver);

MODULE_AUTHOR("Ariana Lazar <ariana.lazar@microchip.com>");
MODULE_DESCRIPTION("IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface");
MODULE_LICENSE("GPL");