drivers/iio/dac/ad5686.c - kernel/msm-4.19 - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * AD5686R, AD5685R, AD5684R Digital to analog converters  driver
  *
  * Copyright 2011 Analog Devices Inc.
  */

 #include <linux/interrupt.h>
 #include <linux/fs.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>

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

 #include "ad5686.h"

 static const char * const ad5686_powerdown_modes[] = {
 	"1kohm_to_gnd",
 	"100kohm_to_gnd",
 	"three_state"
 };

 static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
 				     const struct iio_chan_spec *chan)
 {
 	struct ad5686_state *st = iio_priv(indio_dev);

 	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
 }

 static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
 				     const struct iio_chan_spec *chan,
 				     unsigned int mode)
 {
 	struct ad5686_state *st = iio_priv(indio_dev);

 	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
 	st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));

 	return 0;
 }

 static const struct iio_enum ad5686_powerdown_mode_enum = {
 	.items = ad5686_powerdown_modes,
 	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),
 	.get = ad5686_get_powerdown_mode,
 	.set = ad5686_set_powerdown_mode,
 };

 static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
 		uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 {
 	struct ad5686_state *st = iio_priv(indio_dev);

 	return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
 				       (0x3 << (chan->channel * 2))));
 }

 static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
 					  uintptr_t private,
 					  const struct iio_chan_spec *chan,
 					  const char *buf,
 					  size_t len)
 {
 	bool readin;
 	int ret;
 	struct ad5686_state *st = iio_priv(indio_dev);
 	unsigned int val, ref_bit_msk;
 	u8 shift;

 	ret = strtobool(buf, &readin);
 	if (ret)
 		return ret;

 	if (readin)
 		st->pwr_down_mask |= (0x3 << (chan->channel * 2));
 	else
 		st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));

 	switch (st->chip_info->regmap_type) {
 	case AD5683_REGMAP:
 		shift = 13;
 		ref_bit_msk = AD5683_REF_BIT_MSK;
 		break;
 	case AD5686_REGMAP:
 		shift = 0;
 		ref_bit_msk = 0;
 		break;
 	case AD5693_REGMAP:
 		shift = 13;
 		ref_bit_msk = AD5693_REF_BIT_MSK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
 	if (!st->use_internal_vref)
 		val |= ref_bit_msk;

 	ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);

 	return ret ? ret : len;
 }

 static int ad5686_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val,
 			   int *val2,
 			   long m)
 {
 	struct ad5686_state *st = iio_priv(indio_dev);
 	int ret;

 	switch (m) {
 	case IIO_CHAN_INFO_RAW:
 		mutex_lock(&indio_dev->mlock);
 		ret = st->read(st, chan->address);
 		mutex_unlock(&indio_dev->mlock);
 		if (ret < 0)
 			return ret;
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->vref_mv;
 		*val2 = chan->scan_type.realbits;
 		return IIO_VAL_FRACTIONAL_LOG2;
 	}
 	return -EINVAL;
 }

 static int ad5686_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int val,
 			    int val2,
 			    long mask)
 {
 	struct ad5686_state *st = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		if (val > (1 << chan->scan_type.realbits) || val < 0)
 			return -EINVAL;

 		mutex_lock(&indio_dev->mlock);
 		ret = st->write(st,
 				AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
 				chan->address,
 				val << chan->scan_type.shift);
 		mutex_unlock(&indio_dev->mlock);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static const struct iio_info ad5686_info = {
 	.read_raw = ad5686_read_raw,
 	.write_raw = ad5686_write_raw,
 };

 static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
 	{
 		.name = "powerdown",
 		.read = ad5686_read_dac_powerdown,
 		.write = ad5686_write_dac_powerdown,
 		.shared = IIO_SEPARATE,
 	},
 	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
 	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
 	{ },
 };

 #define AD5868_CHANNEL(chan, addr, bits, _shift) {		\
 		.type = IIO_VOLTAGE,				\
 		.indexed = 1,					\
 		.output = 1,					\
 		.channel = chan,				\
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
 		.address = addr,				\
 		.scan_type = {					\
 			.sign = 'u',				\
 			.realbits = (bits),			\
 			.storagebits = 16,			\
 			.shift = (_shift),			\
 		},						\
 		.ext_info = ad5686_ext_info,			\
 }

 #define DECLARE_AD5693_CHANNELS(name, bits, _shift)		\
 static struct iio_chan_spec name[] = {				\
 		AD5868_CHANNEL(0, 0, bits, _shift),		\
 }

 #define DECLARE_AD5686_CHANNELS(name, bits, _shift)		\
 static struct iio_chan_spec name[] = {				\
 		AD5868_CHANNEL(0, 1, bits, _shift),		\
 		AD5868_CHANNEL(1, 2, bits, _shift),		\
 		AD5868_CHANNEL(2, 4, bits, _shift),		\
 		AD5868_CHANNEL(3, 8, bits, _shift),		\
 }

 #define DECLARE_AD5676_CHANNELS(name, bits, _shift)		\
 static struct iio_chan_spec name[] = {				\
 		AD5868_CHANNEL(0, 0, bits, _shift),		\
 		AD5868_CHANNEL(1, 1, bits, _shift),		\
 		AD5868_CHANNEL(2, 2, bits, _shift),		\
 		AD5868_CHANNEL(3, 3, bits, _shift),		\
 		AD5868_CHANNEL(4, 4, bits, _shift),		\
 		AD5868_CHANNEL(5, 5, bits, _shift),		\
 		AD5868_CHANNEL(6, 6, bits, _shift),		\
 		AD5868_CHANNEL(7, 7, bits, _shift),		\
 }

 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
 DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
 DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
 DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
 DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
 DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
 DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
 DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);

 static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
 	[ID_AD5311R] = {
 		.channels = ad5311r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
 	[ID_AD5671R] = {
 		.channels = ad5672_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 8,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5672R] = {
 		.channels = ad5672_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 8,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5675R] = {
 		.channels = ad5676_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 8,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5676] = {
 		.channels = ad5676_channels,
 		.num_channels = 8,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5676R] = {
 		.channels = ad5676_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 8,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5681R] = {
 		.channels = ad5691r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5683_REGMAP,
 	},
 	[ID_AD5682R] = {
 		.channels = ad5692r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5683_REGMAP,
 	},
 	[ID_AD5683] = {
 		.channels = ad5693_channels,
 		.num_channels = 1,
 		.regmap_type = AD5683_REGMAP,
 	},
 	[ID_AD5683R] = {
 		.channels = ad5693_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5683_REGMAP,
 	},
 	[ID_AD5684] = {
 		.channels = ad5684_channels,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5684R] = {
 		.channels = ad5684_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5685R] = {
 		.channels = ad5685r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5686] = {
 		.channels = ad5686_channels,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5686R] = {
 		.channels = ad5686_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5691R] = {
 		.channels = ad5691r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
 	[ID_AD5692R] = {
 		.channels = ad5692r_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
 	[ID_AD5693] = {
 		.channels = ad5693_channels,
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
 	[ID_AD5693R] = {
 		.channels = ad5693_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
 	[ID_AD5694] = {
 		.channels = ad5684_channels,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5694R] = {
 		.channels = ad5684_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5696] = {
 		.channels = ad5686_channels,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 	[ID_AD5696R] = {
 		.channels = ad5686_channels,
 		.int_vref_mv = 2500,
 		.num_channels = 4,
 		.regmap_type = AD5686_REGMAP,
 	},
 };

 int ad5686_probe(struct device *dev,
 		 enum ad5686_supported_device_ids chip_type,
 		 const char *name, ad5686_write_func write,
 		 ad5686_read_func read)
 {
 	struct ad5686_state *st;
 	struct iio_dev *indio_dev;
 	unsigned int val, ref_bit_msk;
 	u8 cmd;
 	int ret, i, voltage_uv = 0;

 	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 	if (indio_dev == NULL)
 		return  -ENOMEM;

 	st = iio_priv(indio_dev);
 	dev_set_drvdata(dev, indio_dev);

 	st->dev = dev;
 	st->write = write;
 	st->read = read;

 	st->reg = devm_regulator_get_optional(dev, "vcc");
 	if (!IS_ERR(st->reg)) {
 		ret = regulator_enable(st->reg);
 		if (ret)
 			return ret;

 		ret = regulator_get_voltage(st->reg);
 		if (ret < 0)
 			goto error_disable_reg;

 		voltage_uv = ret;
 	}

 	st->chip_info = &ad5686_chip_info_tbl[chip_type];

 	if (voltage_uv)
 		st->vref_mv = voltage_uv / 1000;
 	else
 		st->vref_mv = st->chip_info->int_vref_mv;

 	/* Set all the power down mode for all channels to 1K pulldown */
 	for (i = 0; i < st->chip_info->num_channels; i++)
 		st->pwr_down_mode |= (0x01 << (i * 2));

 	indio_dev->dev.parent = dev;
 	indio_dev->name = name;
 	indio_dev->info = &ad5686_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = st->chip_info->channels;
 	indio_dev->num_channels = st->chip_info->num_channels;

 	switch (st->chip_info->regmap_type) {
 	case AD5683_REGMAP:
 		cmd = AD5686_CMD_CONTROL_REG;
 		ref_bit_msk = AD5683_REF_BIT_MSK;
 		st->use_internal_vref = !voltage_uv;
 		break;
 	case AD5686_REGMAP:
 		cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
 		ref_bit_msk = 0;
 		break;
 	case AD5693_REGMAP:
 		cmd = AD5686_CMD_CONTROL_REG;
 		ref_bit_msk = AD5693_REF_BIT_MSK;
 		st->use_internal_vref = !voltage_uv;
 		break;
 	default:
 		ret = -EINVAL;
 		goto error_disable_reg;
 	}

 	val = (voltage_uv | ref_bit_msk);

 	ret = st->write(st, cmd, 0, !!val);
 	if (ret)
 		goto error_disable_reg;

 	ret = iio_device_register(indio_dev);
 	if (ret)
 		goto error_disable_reg;

 	return 0;

 error_disable_reg:
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(ad5686_probe);

 int ad5686_remove(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5686_state *st = iio_priv(indio_dev);

 	iio_device_unregister(indio_dev);
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(ad5686_remove);

 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* AD5686R, AD5685R, AD5684R Digital to analog converters driver
	*
	* Copyright 2011 Analog Devices Inc.
	*/

	#include <linux/interrupt.h>
	#include <linux/fs.h>
	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/regulator/consumer.h>

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

	#include "ad5686.h"

	static const char * const ad5686_powerdown_modes[] = {
	"1kohm_to_gnd",
	"100kohm_to_gnd",
	"three_state"
	};

	static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
	{
	struct ad5686_state *st = iio_priv(indio_dev);

	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
	}

	static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan,
	unsigned int mode)
	{
	struct ad5686_state *st = iio_priv(indio_dev);

	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
	st->pwr_down_mode \|= ((mode + 1) << (chan->channel * 2));

	return 0;
	}

	static const struct iio_enum ad5686_powerdown_mode_enum = {
	.items = ad5686_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),
	.get = ad5686_get_powerdown_mode,
	.set = ad5686_set_powerdown_mode,
	};

	static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec chan, char buf)
	{
	struct ad5686_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
	(0x3 << (chan->channel * 2))));
	}

	static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private,
	const struct iio_chan_spec *chan,
	const char *buf,
	size_t len)
	{
	bool readin;
	int ret;
	struct ad5686_state *st = iio_priv(indio_dev);
	unsigned int val, ref_bit_msk;
	u8 shift;

	ret = strtobool(buf, &readin);
	if (ret)
	return ret;

	if (readin)
	st->pwr_down_mask \|= (0x3 << (chan->channel * 2));
	else
	st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));

	switch (st->chip_info->regmap_type) {
	case AD5683_REGMAP:
	shift = 13;
	ref_bit_msk = AD5683_REF_BIT_MSK;
	break;
	case AD5686_REGMAP:
	shift = 0;
	ref_bit_msk = 0;
	break;
	case AD5693_REGMAP:
	shift = 13;
	ref_bit_msk = AD5693_REF_BIT_MSK;
	break;
	default:
	return -EINVAL;
	}

	val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
	if (!st->use_internal_vref)
	val \|= ref_bit_msk;

	ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);

	return ret ? ret : len;
	}

	static int ad5686_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int *val,
	int *val2,
	long m)
	{
	struct ad5686_state *st = iio_priv(indio_dev);
	int ret;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
	mutex_lock(&indio_dev->mlock);
	ret = st->read(st, chan->address);
	mutex_unlock(&indio_dev->mlock);
	if (ret < 0)
	return ret;
	*val = ret;
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
	*val = st->vref_mv;
	*val2 = chan->scan_type.realbits;
	return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
	}

	static int ad5686_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val,
	int val2,
	long mask)
	{
	struct ad5686_state *st = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	if (val > (1 << chan->scan_type.realbits) \|\| val < 0)
	return -EINVAL;

	mutex_lock(&indio_dev->mlock);
	ret = st->write(st,
	AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
	chan->address,
	val << chan->scan_type.shift);
	mutex_unlock(&indio_dev->mlock);
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static const struct iio_info ad5686_info = {
	.read_raw = ad5686_read_raw,
	.write_raw = ad5686_write_raw,
	};

	static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
	{
	.name = "powerdown",
	.read = ad5686_read_dac_powerdown,
	.write = ad5686_write_dac_powerdown,
	.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
	{ },
	};

	#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.output = 1, \
	.channel = chan, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
	.address = addr, \
	.scan_type = { \
	.sign = 'u', \
	.realbits = (bits), \
	.storagebits = 16, \
	.shift = (_shift), \
	}, \
	.ext_info = ad5686_ext_info, \
	}

	#define DECLARE_AD5693_CHANNELS(name, bits, _shift) \
	static struct iio_chan_spec name[] = { \
	AD5868_CHANNEL(0, 0, bits, _shift), \
	}

	#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
	static struct iio_chan_spec name[] = { \
	AD5868_CHANNEL(0, 1, bits, _shift), \
	AD5868_CHANNEL(1, 2, bits, _shift), \
	AD5868_CHANNEL(2, 4, bits, _shift), \
	AD5868_CHANNEL(3, 8, bits, _shift), \
	}

	#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \
	static struct iio_chan_spec name[] = { \
	AD5868_CHANNEL(0, 0, bits, _shift), \
	AD5868_CHANNEL(1, 1, bits, _shift), \
	AD5868_CHANNEL(2, 2, bits, _shift), \
	AD5868_CHANNEL(3, 3, bits, _shift), \
	AD5868_CHANNEL(4, 4, bits, _shift), \
	AD5868_CHANNEL(5, 5, bits, _shift), \
	AD5868_CHANNEL(6, 6, bits, _shift), \
	AD5868_CHANNEL(7, 7, bits, _shift), \
	}

	DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
	DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
	DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
	DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
	DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
	DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
	DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
	DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
	DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);

	static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
	[ID_AD5311R] = {
	.channels = ad5311r_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5693_REGMAP,
	},
	[ID_AD5671R] = {
	.channels = ad5672_channels,
	.int_vref_mv = 2500,
	.num_channels = 8,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5672R] = {
	.channels = ad5672_channels,
	.int_vref_mv = 2500,
	.num_channels = 8,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5675R] = {
	.channels = ad5676_channels,
	.int_vref_mv = 2500,
	.num_channels = 8,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5676] = {
	.channels = ad5676_channels,
	.num_channels = 8,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5676R] = {
	.channels = ad5676_channels,
	.int_vref_mv = 2500,
	.num_channels = 8,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5681R] = {
	.channels = ad5691r_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5683_REGMAP,
	},
	[ID_AD5682R] = {
	.channels = ad5692r_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5683_REGMAP,
	},
	[ID_AD5683] = {
	.channels = ad5693_channels,
	.num_channels = 1,
	.regmap_type = AD5683_REGMAP,
	},
	[ID_AD5683R] = {
	.channels = ad5693_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5683_REGMAP,
	},
	[ID_AD5684] = {
	.channels = ad5684_channels,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5684R] = {
	.channels = ad5684_channels,
	.int_vref_mv = 2500,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5685R] = {
	.channels = ad5685r_channels,
	.int_vref_mv = 2500,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5686] = {
	.channels = ad5686_channels,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5686R] = {
	.channels = ad5686_channels,
	.int_vref_mv = 2500,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5691R] = {
	.channels = ad5691r_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5693_REGMAP,
	},
	[ID_AD5692R] = {
	.channels = ad5692r_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5693_REGMAP,
	},
	[ID_AD5693] = {
	.channels = ad5693_channels,
	.num_channels = 1,
	.regmap_type = AD5693_REGMAP,
	},
	[ID_AD5693R] = {
	.channels = ad5693_channels,
	.int_vref_mv = 2500,
	.num_channels = 1,
	.regmap_type = AD5693_REGMAP,
	},
	[ID_AD5694] = {
	.channels = ad5684_channels,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5694R] = {
	.channels = ad5684_channels,
	.int_vref_mv = 2500,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5696] = {
	.channels = ad5686_channels,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	[ID_AD5696R] = {
	.channels = ad5686_channels,
	.int_vref_mv = 2500,
	.num_channels = 4,
	.regmap_type = AD5686_REGMAP,
	},
	};

	int ad5686_probe(struct device *dev,
	enum ad5686_supported_device_ids chip_type,
	const char *name, ad5686_write_func write,
	ad5686_read_func read)
	{
	struct ad5686_state *st;
	struct iio_dev *indio_dev;
	unsigned int val, ref_bit_msk;
	u8 cmd;
	int ret, i, voltage_uv = 0;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (indio_dev == NULL)
	return -ENOMEM;

	st = iio_priv(indio_dev);
	dev_set_drvdata(dev, indio_dev);

	st->dev = dev;
	st->write = write;
	st->read = read;

	st->reg = devm_regulator_get_optional(dev, "vcc");
	if (!IS_ERR(st->reg)) {
	ret = regulator_enable(st->reg);
	if (ret)
	return ret;

	ret = regulator_get_voltage(st->reg);
	if (ret < 0)
	goto error_disable_reg;

	voltage_uv = ret;
	}

	st->chip_info = &ad5686_chip_info_tbl[chip_type];

	if (voltage_uv)
	st->vref_mv = voltage_uv / 1000;
	else
	st->vref_mv = st->chip_info->int_vref_mv;

	/* Set all the power down mode for all channels to 1K pulldown */
	for (i = 0; i < st->chip_info->num_channels; i++)
	st->pwr_down_mode \|= (0x01 << (i * 2));

	indio_dev->dev.parent = dev;
	indio_dev->name = name;
	indio_dev->info = &ad5686_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = st->chip_info->channels;
	indio_dev->num_channels = st->chip_info->num_channels;

	switch (st->chip_info->regmap_type) {
	case AD5683_REGMAP:
	cmd = AD5686_CMD_CONTROL_REG;
	ref_bit_msk = AD5683_REF_BIT_MSK;
	st->use_internal_vref = !voltage_uv;
	break;
	case AD5686_REGMAP:
	cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
	ref_bit_msk = 0;
	break;
	case AD5693_REGMAP:
	cmd = AD5686_CMD_CONTROL_REG;
	ref_bit_msk = AD5693_REF_BIT_MSK;
	st->use_internal_vref = !voltage_uv;
	break;
	default:
	ret = -EINVAL;
	goto error_disable_reg;
	}

	val = (voltage_uv \| ref_bit_msk);

	ret = st->write(st, cmd, 0, !!val);
	if (ret)
	goto error_disable_reg;

	ret = iio_device_register(indio_dev);
	if (ret)
	goto error_disable_reg;

	return 0;

	error_disable_reg:
	if (!IS_ERR(st->reg))
	regulator_disable(st->reg);
	return ret;
	}
	EXPORT_SYMBOL_GPL(ad5686_probe);

	int ad5686_remove(struct device *dev)
	{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5686_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!IS_ERR(st->reg))
	regulator_disable(st->reg);

	return 0;
	}
	EXPORT_SYMBOL_GPL(ad5686_remove);

	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
	MODULE_LICENSE("GPL v2");