staging: iio: adc: Replace, rewrite ad7745 from scratch. (83e416f4) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/staging/iio/adc/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -144,7 +144,7 @@ config AD7793
		To compile this driver as a module, choose M here: the
		module will be called AD7793.

		config AD7745
		config AD7746
		tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
		depends on I2C
		help

drivers/staging/iio/adc/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -33,7 +33,7 @@ obj-$(CONFIG_AD7150) += ad7150.o
		obj-$(CONFIG_AD7152) += ad7152.o
		obj-$(CONFIG_AD7291) += ad7291.o
		obj-$(CONFIG_AD7314) += ad7314.o
		obj-$(CONFIG_AD7745) += ad7745.o
		obj-$(CONFIG_AD7746) += ad7746.o
		obj-$(CONFIG_AD7780) += ad7780.o
		obj-$(CONFIG_AD7793) += ad7793.o
		obj-$(CONFIG_AD7816) += ad7816.o

drivers/staging/iio/adc/ad7745.c

deleted100644 → 0

+0 −673

Original line number	Diff line number	Diff line
		/*
		* AD774X capacitive sensor driver supporting AD7745/6/7
		*
		* Copyright 2010 Analog Devices Inc.
		*
		* Licensed under the GPL-2 or later.
		*/

		#include <linux/interrupt.h>
		#include <linux/gpio.h>
		#include <linux/device.h>
		#include <linux/kernel.h>
		#include <linux/slab.h>
		#include <linux/sysfs.h>
		#include <linux/list.h>
		#include <linux/i2c.h>
		#include <linux/module.h>

		#include "../iio.h"
		#include "../sysfs.h"

		/*
		* AD774X registers definition
		*/

		#define AD774X_STATUS 0
		#define AD774X_STATUS_RDY (1 << 2)
		#define AD774X_STATUS_RDYVT (1 << 1)
		#define AD774X_STATUS_RDYCAP (1 << 0)
		#define AD774X_CAP_DATA_HIGH 1
		#define AD774X_CAP_DATA_MID 2
		#define AD774X_CAP_DATA_LOW 3
		#define AD774X_VT_DATA_HIGH 4
		#define AD774X_VT_DATA_MID 5
		#define AD774X_VT_DATA_LOW 6
		#define AD774X_CAP_SETUP 7
		#define AD774X_VT_SETUP 8
		#define AD774X_EXEC_SETUP 9
		#define AD774X_CFG 10
		#define AD774X_CAPDACA 11
		#define AD774X_CAPDACB 12
		#define AD774X_CAPDAC_EN (1 << 7)
		#define AD774X_CAP_OFFH 13
		#define AD774X_CAP_OFFL 14
		#define AD774X_CAP_GAINH 15
		#define AD774X_CAP_GAINL 16
		#define AD774X_VOLT_GAINH 17
		#define AD774X_VOLT_GAINL 18

		#define AD774X_MAX_CONV_MODE 6

		/*
		* struct ad774x_chip_info - chip specifc information
		*/

		struct ad774x_chip_info {
		struct i2c_client *client;
		bool inter;
		u16 cap_offs; /* Capacitive offset */
		u16 cap_gain; /* Capacitive gain calibration */
		u16 volt_gain; /* Voltage gain calibration */
		u8 cap_setup;
		u8 vt_setup;
		u8 exec_setup;

		char *conversion_mode;
		};

		struct ad774x_conversion_mode {
		char *name;
		u8 reg_cfg;
		};

		static struct ad774x_conversion_mode
		ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
		{ "idle", 0 },
		{ "continuous-conversion", 1 },
		{ "single-conversion", 2 },
		{ "power-down", 3 },
		{ "offset-calibration", 5 },
		{ "gain-calibration", 6 },
		};

		/*
		* ad774x register access by I2C
		*/

		static int ad774x_i2c_read(struct ad774x_chip_info chip, u8 reg, u8 data, int len)
		{
		struct i2c_client *client = chip->client;
		int ret;

		ret = i2c_master_send(client, &reg, 1);
		if (ret < 0) {
		dev_err(&client->dev, "I2C write error\n");
		return ret;
		}

		ret = i2c_master_recv(client, data, len);
		if (ret < 0) {
		dev_err(&client->dev, "I2C read error\n");
		return ret;
		}

		return ret;
		}

		static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data)
		{
		struct i2c_client *client = chip->client;
		int ret;

		u8 tx[2] = {
		reg,
		data,
		};

		ret = i2c_master_send(client, tx, 2);
		if (ret < 0)
		dev_err(&client->dev, "I2C write error\n");

		return ret;
		}

		/*
		* sysfs nodes
		*/

		#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
		IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
		#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
		IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \
		IIO_DEVICE_ATTR(in_capacitance_setup, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \
		IIO_DEVICE_ATTR(in_voltage0_setup, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \
		IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \
		IIO_DEVICE_ATTR(in_voltage0_gain, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \
		IIO_DEVICE_ATTR(in_capacitance_offs, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \
		IIO_DEVICE_ATTR(in_capacitance_gain, _mode, _show, _store, 0)
		#define IIO_DEV_ATTR_CAP_DATA(_show) \
		IIO_DEVICE_ATTR(in_capacitance0_raw, S_IRUGO, _show, NULL, 0)
		#define IIO_DEV_ATTR_VT_DATA(_show) \
		IIO_DEVICE_ATTR(in_voltage0_raw, S_IRUGO, _show, NULL, 0)

		static ssize_t ad774x_show_conversion_modes(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		int i;
		int len = 0;

		for (i = 0; i < AD774X_MAX_CONV_MODE; i++)
		len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name);

		len += sprintf(buf + len, "\n");

		return len;
		}

		static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes);

		static ssize_t ad774x_show_conversion_mode(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "%s\n", chip->conversion_mode);
		}

		static ssize_t ad774x_store_conversion_mode(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		u8 cfg;
		int i;

		ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1);

		for (i = 0; i < AD774X_MAX_CONV_MODE; i++) {
		if (strncmp(buf, ad774x_conv_mode_table[i].name,
		strlen(ad774x_conv_mode_table[i].name) - 1) == 0) {
		chip->conversion_mode = ad774x_conv_mode_table[i].name;
		cfg \|= 0x18 \| ad774x_conv_mode_table[i].reg_cfg;
		ad774x_i2c_write(chip, AD774X_CFG, cfg);
		return len;
		}
		}

		dev_err(dev, "not supported conversion mode\n");

		return -EINVAL;
		}

		static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO \| S_IWUSR,
		ad774x_show_conversion_mode,
		ad774x_store_conversion_mode);

		static ssize_t ad774x_show_dac_value(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
		u8 data;

		ad774x_i2c_read(chip, this_attr->address, &data, 1);

		return sprintf(buf, "%02x\n", data & 0x7F);
		}

		static ssize_t ad774x_store_dac_value(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if (!ret) {
		ad774x_i2c_write(chip, this_attr->address,
		(data ? AD774X_CAPDAC_EN : 0) \| (data & 0x7F));
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEVICE_ATTR(out_capacitance0_raw, S_IRUGO \| S_IWUSR,
		ad774x_show_dac_value,
		ad774x_store_dac_value,
		AD774X_CAPDACA);

		static IIO_DEVICE_ATTR(out_capacitance1_raw, S_IRUGO \| S_IWUSR,
		ad774x_show_dac_value,
		ad774x_store_dac_value,
		AD774X_CAPDACB);

		static ssize_t ad774x_show_cap_setup(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "0x%02x\n", chip->cap_setup);
		}

		static ssize_t ad774x_store_cap_setup(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x100)) {
		ad774x_i2c_write(chip, AD774X_CAP_SETUP, data);
		chip->cap_setup = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO \| S_IWUSR,
		ad774x_show_cap_setup,
		ad774x_store_cap_setup);

		static ssize_t ad774x_show_vt_setup(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "0x%02x\n", chip->vt_setup);
		}

		static ssize_t ad774x_store_vt_setup(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x100)) {
		ad774x_i2c_write(chip, AD774X_VT_SETUP, data);
		chip->vt_setup = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_VT_SETUP(S_IRUGO \| S_IWUSR,
		ad774x_show_vt_setup,
		ad774x_store_vt_setup);

		static ssize_t ad774x_show_exec_setup(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "0x%02x\n", chip->exec_setup);
		}

		static ssize_t ad774x_store_exec_setup(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x100)) {
		ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data);
		chip->exec_setup = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO \| S_IWUSR,
		ad774x_show_exec_setup,
		ad774x_store_exec_setup);

		static ssize_t ad774x_show_volt_gain(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "%d\n", chip->volt_gain);
		}

		static ssize_t ad774x_store_volt_gain(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x10000)) {
		ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8);
		ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data);
		chip->volt_gain = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO \| S_IWUSR,
		ad774x_show_volt_gain,
		ad774x_store_volt_gain);

		static ssize_t ad774x_show_cap_data(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		char tmp[3];

		ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3);
		data = ((int)tmp[0] << 16) \| ((int)tmp[1] << 8) \| (int)tmp[2];

		return sprintf(buf, "%ld\n", data);
		}

		static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data);

		static ssize_t ad774x_show_vt_data(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		char tmp[3];

		ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3);
		data = ((int)tmp[0] << 16) \| ((int)tmp[1] << 8) \| (int)tmp[2];

		return sprintf(buf, "%ld\n", data);
		}

		static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data);

		static ssize_t ad774x_show_cap_offs(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "%d\n", chip->cap_offs);
		}

		static ssize_t ad774x_store_cap_offs(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x10000)) {
		ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8);
		ad774x_i2c_write(chip, AD774X_CAP_OFFL, data);
		chip->cap_offs = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO \| S_IWUSR,
		ad774x_show_cap_offs,
		ad774x_store_cap_offs);

		static ssize_t ad774x_show_cap_gain(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);

		return sprintf(buf, "%d\n", chip->cap_gain);
		}

		static ssize_t ad774x_store_cap_gain(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *dev_info = dev_get_drvdata(dev);
		struct ad774x_chip_info *chip = iio_priv(dev_info);
		unsigned long data;
		int ret;

		ret = strict_strtoul(buf, 10, &data);

		if ((!ret) && (data < 0x10000)) {
		ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8);
		ad774x_i2c_write(chip, AD774X_CAP_GAINL, data);
		chip->cap_gain = data;
		return len;
		}

		return -EINVAL;
		}

		static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO \| S_IWUSR,
		ad774x_show_cap_gain,
		ad774x_store_cap_gain);

		static struct attribute *ad774x_attributes[] = {
		&iio_dev_attr_available_conversion_modes.dev_attr.attr,
		&iio_dev_attr_conversion_mode.dev_attr.attr,
		&iio_dev_attr_in_capacitance_setup.dev_attr.attr,
		&iio_dev_attr_in_voltage0_setup.dev_attr.attr,
		&iio_dev_attr_exec_setup.dev_attr.attr,
		&iio_dev_attr_in_capacitance_offs.dev_attr.attr,
		&iio_dev_attr_in_capacitance_gain.dev_attr.attr,
		&iio_dev_attr_in_voltage0_gain.dev_attr.attr,
		&iio_dev_attr_in_voltage0_raw.dev_attr.attr,
		&iio_dev_attr_in_capacitance0_raw.dev_attr.attr,
		&iio_dev_attr_out_capacitance0_raw.dev_attr.attr,
		&iio_dev_attr_out_capacitance1_raw.dev_attr.attr,
		NULL,
		};

		static const struct attribute_group ad774x_attribute_group = {
		.attrs = ad774x_attributes,
		};

		/*
		* data ready events
		*/

		#define IIO_EVENT_CODE_CAP_RDY 0
		#define IIO_EVENT_CODE_VT_RDY 1

		#define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \
		IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask)

		#define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \
		IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask)

		static irqreturn_t ad774x_event_handler(int irq, void *private)
		{
		struct iio_dev *indio_dev = private;
		struct ad774x_chip_info *chip = iio_priv(indio_dev);
		u8 int_status;

		ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1);

		if (int_status & AD774X_STATUS_RDYCAP)
		iio_push_event(indio_dev,
		IIO_EVENT_CODE_CAP_RDY,
		iio_get_time_ns());

		if (int_status & AD774X_STATUS_RDYVT)
		iio_push_event(indio_dev,
		IIO_EVENT_CODE_VT_RDY,
		iio_get_time_ns());

		return IRQ_HANDLED;
		}

		static IIO_CONST_ATTR(cap_rdy_en, "1");
		static IIO_CONST_ATTR(vt_rdy_en, "1");

		static struct attribute *ad774x_event_attributes[] = {
		&iio_const_attr_cap_rdy_en.dev_attr.attr,
		&iio_const_attr_vt_rdy_en.dev_attr.attr,
		NULL,
		};

		static struct attribute_group ad774x_event_attribute_group = {
		.attrs = ad774x_event_attributes,
		.name = "events",
		};

		static const struct iio_info ad774x_info = {
		.attrs = &ad774x_event_attribute_group,
		.event_attrs = &ad774x_event_attribute_group,
		.driver_module = THIS_MODULE,
		};
		/*
		* device probe and remove
		*/

		static int __devinit ad774x_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret;
		struct ad774x_chip_info *chip;
		struct iio_dev *indio_dev;

		indio_dev = iio_allocate_device(sizeof(*chip));
		if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
		}
		chip = iio_priv(indio_dev);
		/* this is only used for device removal purposes */
		i2c_set_clientdata(client, indio_dev);

		chip->client = client;

		/* Establish that the iio_dev is a child of the i2c device */
		indio_dev->name = id->name;
		indio_dev->dev.parent = &client->dev;
		indio_dev->info = &ad774x_info;
		indio_dev->modes = INDIO_DIRECT_MODE;

		if (client->irq) {
		ret = request_threaded_irq(client->irq,
		NULL,
		&ad774x_event_handler,
		IRQF_TRIGGER_FALLING,
		"ad774x",
		indio_dev);
		if (ret)
		goto error_free_dev;
		}

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

		dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq);

		return 0;

		error_free_irq:
		free_irq(client->irq, indio_dev);
		error_free_dev:
		iio_free_device(indio_dev);
		error_ret:
		return ret;
		}

		static int __devexit ad774x_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);

		if (client->irq)
		free_irq(client->irq, indio_dev);
		iio_device_unregister(indio_dev);

		return 0;
		}

		static const struct i2c_device_id ad774x_id[] = {
		{ "ad7745", 0 },
		{ "ad7746", 0 },
		{ "ad7747", 0 },
		{}
		};

		MODULE_DEVICE_TABLE(i2c, ad774x_id);

		static struct i2c_driver ad774x_driver = {
		.driver = {
		.name = "ad774x",
		},
		.probe = ad774x_probe,
		.remove = __devexit_p(ad774x_remove),
		.id_table = ad774x_id,
		};

		static __init int ad774x_init(void)
		{
		return i2c_add_driver(&ad774x_driver);
		}

		static __exit void ad774x_exit(void)
		{
		i2c_del_driver(&ad774x_driver);
		}

		MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
		MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver");
		MODULE_LICENSE("GPL v2");

		module_init(ad774x_init);
		module_exit(ad774x_exit);

drivers/staging/iio/adc/ad7746.c

0 → 100644

+804 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/staging/iio/adc/ad7746.h

0 → 100644

+29 −0

Original line number	Diff line number	Diff line
		/*
		* AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
		*
		* Copyright 2011 Analog Devices Inc.
		*
		* Licensed under the GPL-2.
		*/

		#ifndef IIO_CDC_AD7746_H_
		#define IIO_CDC_AD7746_H_

		/*
		* TODO: struct ad7746_platform_data needs to go into include/linux/iio
		*/

		#define AD7466_EXCLVL_0 0 /* +-VDD/8 */
		#define AD7466_EXCLVL_1 1 /* +-VDD/4 */
		#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */
		#define AD7466_EXCLVL_3 3 /* +-VDD/2 */

		struct ad7746_platform_data {
		unsigned char exclvl; /Excitation Voltage Level /
		bool exca_en; /* enables EXCA pin as the excitation output */
		bool exca_inv_en; /* enables /EXCA pin as the excitation output */
		bool excb_en; /* enables EXCB pin as the excitation output */
		bool excb_inv_en; /* enables /EXCB pin as the excitation output */
		};

		#endif /* IIO_CDC_AD7746_H_ */