[linux-2.6-block.git] / drivers / staging / iio / adc / ad7745.c

/*
 * 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);
Commit	Line	Data
671d85f2 BS	1	/*
	2	* AD774X capacitive sensor driver supporting AD7745/6/7
	3	*
	4	* Copyright 2010 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
	9	#include <linux/interrupt.h>
	10	#include <linux/gpio.h>
671d85f2 BS	11	#include <linux/device.h>
	12	#include <linux/kernel.h>
	13	#include <linux/slab.h>
	14	#include <linux/sysfs.h>
	15	#include <linux/list.h>
	16	#include <linux/i2c.h>
99c97852	17	#include <linux/module.h>
671d85f2 BS	18
	19	#include "../iio.h"
	20	#include "../sysfs.h"
	21
	22	/*
	23	* AD774X registers definition
	24	*/
	25
	26	#define AD774X_STATUS 0
	27	#define AD774X_STATUS_RDY (1 << 2)
	28	#define AD774X_STATUS_RDYVT (1 << 1)
	29	#define AD774X_STATUS_RDYCAP (1 << 0)
	30	#define AD774X_CAP_DATA_HIGH 1
	31	#define AD774X_CAP_DATA_MID 2
	32	#define AD774X_CAP_DATA_LOW 3
	33	#define AD774X_VT_DATA_HIGH 4
	34	#define AD774X_VT_DATA_MID 5
	35	#define AD774X_VT_DATA_LOW 6
	36	#define AD774X_CAP_SETUP 7
	37	#define AD774X_VT_SETUP 8
	38	#define AD774X_EXEC_SETUP 9
	39	#define AD774X_CFG 10
	40	#define AD774X_CAPDACA 11
	41	#define AD774X_CAPDACB 12
	42	#define AD774X_CAPDAC_EN (1 << 7)
	43	#define AD774X_CAP_OFFH 13
	44	#define AD774X_CAP_OFFL 14
	45	#define AD774X_CAP_GAINH 15
	46	#define AD774X_CAP_GAINL 16
	47	#define AD774X_VOLT_GAINH 17
	48	#define AD774X_VOLT_GAINL 18
	49
	50	#define AD774X_MAX_CONV_MODE 6
	51
	52	/*
	53	* struct ad774x_chip_info - chip specifc information
	54	*/
	55
	56	struct ad774x_chip_info {
671d85f2	57	struct i2c_client *client;
671d85f2	58	bool inter;
671d85f2 BS	59	u16 cap_offs; /* Capacitive offset */
	60	u16 cap_gain; /* Capacitive gain calibration */
	61	u16 volt_gain; /* Voltage gain calibration */
	62	u8 cap_setup;
	63	u8 vt_setup;
	64	u8 exec_setup;
	65
	66	char *conversion_mode;
	67	};
	68
	69	struct ad774x_conversion_mode {
	70	char *name;
	71	u8 reg_cfg;
	72	};
	73
724cf92d JC	74	static struct ad774x_conversion_mode
724cf92d JC	75	ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
671d85f2 BS	76	{ "idle", 0 },
	77	{ "continuous-conversion", 1 },
	78	{ "single-conversion", 2 },
	79	{ "power-down", 3 },
	80	{ "offset-calibration", 5 },
	81	{ "gain-calibration", 6 },
	82	};
	83
	84	/*
	85	* ad774x register access by I2C
	86	*/
	87
	88	static int ad774x_i2c_read(struct ad774x_chip_info chip, u8 reg, u8 data, int len)
	89	{
	90	struct i2c_client *client = chip->client;
	91	int ret;
	92
	93	ret = i2c_master_send(client, &reg, 1);
	94	if (ret < 0) {
	95	dev_err(&client->dev, "I2C write error\n");
	96	return ret;
	97	}
	98
	99	ret = i2c_master_recv(client, data, len);
	100	if (ret < 0) {
	101	dev_err(&client->dev, "I2C read error\n");
	102	return ret;
	103	}
	104
	105	return ret;
	106	}
	107
	108	static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data)
	109	{
	110	struct i2c_client *client = chip->client;
	111	int ret;
	112
	113	u8 tx[2] = {
	114	reg,
	115	data,
	116	};
	117
	118	ret = i2c_master_send(client, tx, 2);
	119	if (ret < 0)
	120	dev_err(&client->dev, "I2C write error\n");
	121
	122	return ret;
	123	}
	124
	125	/*
	126	* sysfs nodes
	127	*/
	128
	129	#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
	130	IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
	131	#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
	132	IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
	133	#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \
322c9563	134	IIO_DEVICE_ATTR(in_capacitance_setup, _mode, _show, _store, 0)
671d85f2	135	#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \
322c9563	136	IIO_DEVICE_ATTR(in_voltage0_setup, _mode, _show, _store, 0)
671d85f2 BS	137	#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \
	138	IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0)
	139	#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \
322c9563	140	IIO_DEVICE_ATTR(in_voltage0_gain, _mode, _show, _store, 0)
671d85f2	141	#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \
322c9563	142	IIO_DEVICE_ATTR(in_capacitance_offs, _mode, _show, _store, 0)
671d85f2	143	#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \
322c9563	144	IIO_DEVICE_ATTR(in_capacitance_gain, _mode, _show, _store, 0)
671d85f2	145	#define IIO_DEV_ATTR_CAP_DATA(_show) \
322c9563	146	IIO_DEVICE_ATTR(in_capacitance0_raw, S_IRUGO, _show, NULL, 0)
671d85f2	147	#define IIO_DEV_ATTR_VT_DATA(_show) \
322c9563	148	IIO_DEVICE_ATTR(in_voltage0_raw, S_IRUGO, _show, NULL, 0)
671d85f2 BS	149
	150	static ssize_t ad774x_show_conversion_modes(struct device *dev,
	151	struct device_attribute *attr,
	152	char *buf)
	153	{
	154	int i;
	155	int len = 0;
	156
	157	for (i = 0; i < AD774X_MAX_CONV_MODE; i++)
	158	len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name);
	159
	160	len += sprintf(buf + len, "\n");
	161
	162	return len;
	163	}
	164
	165	static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes);
	166
	167	static ssize_t ad774x_show_conversion_mode(struct device *dev,
	168	struct device_attribute *attr,
	169	char *buf)
	170	{
	171	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	172	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	173
	174	return sprintf(buf, "%s\n", chip->conversion_mode);
	175	}
	176
	177	static ssize_t ad774x_store_conversion_mode(struct device *dev,
	178	struct device_attribute *attr,
	179	const char *buf,
	180	size_t len)
	181	{
	182	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	183	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	184	u8 cfg;
	185	int i;
	186
	187	ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1);
	188
	189	for (i = 0; i < AD774X_MAX_CONV_MODE; i++) {
	190	if (strncmp(buf, ad774x_conv_mode_table[i].name,
	191	strlen(ad774x_conv_mode_table[i].name) - 1) == 0) {
	192	chip->conversion_mode = ad774x_conv_mode_table[i].name;
	193	cfg \|= 0x18 \| ad774x_conv_mode_table[i].reg_cfg;
	194	ad774x_i2c_write(chip, AD774X_CFG, cfg);
	195	return len;
	196	}
	197	}
	198
	199	dev_err(dev, "not supported conversion mode\n");
	200
	201	return -EINVAL;
	202	}
	203
	204	static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO \| S_IWUSR,
	205	ad774x_show_conversion_mode,
	206	ad774x_store_conversion_mode);
	207
	208	static ssize_t ad774x_show_dac_value(struct device *dev,
	209	struct device_attribute *attr,
	210	char *buf)
	211	{
	212	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	213	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	214	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	215	u8 data;
	216
	217	ad774x_i2c_read(chip, this_attr->address, &data, 1);
	218
	219	return sprintf(buf, "%02x\n", data & 0x7F);
	220	}
	221
	222	static ssize_t ad774x_store_dac_value(struct device *dev,
	223	struct device_attribute *attr,
	224	const char *buf,
	225	size_t len)
	226	{
	227	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	228	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	229	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	230	unsigned long data;
	231	int ret;
	232
	233	ret = strict_strtoul(buf, 10, &data);
	234
	235	if (!ret) {
	236	ad774x_i2c_write(chip, this_attr->address,
	237	(data ? AD774X_CAPDAC_EN : 0) \| (data & 0x7F));
	238	return len;
	239	}
	240
	241	return -EINVAL;
	242	}
	243
322c9563	244	static IIO_DEVICE_ATTR(out_capacitance0_raw, S_IRUGO \| S_IWUSR,
671d85f2 BS	245	ad774x_show_dac_value,
	246	ad774x_store_dac_value,
	247	AD774X_CAPDACA);
	248
322c9563	249	static IIO_DEVICE_ATTR(out_capacitance1_raw, S_IRUGO \| S_IWUSR,
671d85f2 BS	250	ad774x_show_dac_value,
	251	ad774x_store_dac_value,
	252	AD774X_CAPDACB);
	253
	254	static ssize_t ad774x_show_cap_setup(struct device *dev,
	255	struct device_attribute *attr,
	256	char *buf)
	257	{
	258	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	259	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	260
	261	return sprintf(buf, "0x%02x\n", chip->cap_setup);
	262	}
	263
	264	static ssize_t ad774x_store_cap_setup(struct device *dev,
	265	struct device_attribute *attr,
	266	const char *buf,
	267	size_t len)
	268	{
	269	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	270	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	271	unsigned long data;
	272	int ret;
	273
	274	ret = strict_strtoul(buf, 10, &data);
	275
	276	if ((!ret) && (data < 0x100)) {
	277	ad774x_i2c_write(chip, AD774X_CAP_SETUP, data);
	278	chip->cap_setup = data;
	279	return len;
	280	}
	281
	282	return -EINVAL;
	283	}
	284
	285	static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO \| S_IWUSR,
	286	ad774x_show_cap_setup,
	287	ad774x_store_cap_setup);
	288
	289	static ssize_t ad774x_show_vt_setup(struct device *dev,
	290	struct device_attribute *attr,
	291	char *buf)
	292	{
	293	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	294	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	295
	296	return sprintf(buf, "0x%02x\n", chip->vt_setup);
	297	}
	298
	299	static ssize_t ad774x_store_vt_setup(struct device *dev,
	300	struct device_attribute *attr,
	301	const char *buf,
	302	size_t len)
	303	{
	304	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	305	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	306	unsigned long data;
	307	int ret;
	308
	309	ret = strict_strtoul(buf, 10, &data);
	310
	311	if ((!ret) && (data < 0x100)) {
	312	ad774x_i2c_write(chip, AD774X_VT_SETUP, data);
	313	chip->vt_setup = data;
	314	return len;
	315	}
	316
	317	return -EINVAL;
	318	}
	319
	320	static IIO_DEV_ATTR_VT_SETUP(S_IRUGO \| S_IWUSR,
	321	ad774x_show_vt_setup,
	322	ad774x_store_vt_setup);
	323
	324	static ssize_t ad774x_show_exec_setup(struct device *dev,
	325	struct device_attribute *attr,
	326	char *buf)
	327	{
	328	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	329	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	330
	331	return sprintf(buf, "0x%02x\n", chip->exec_setup);
	332	}
	333
	334	static ssize_t ad774x_store_exec_setup(struct device *dev,
	335	struct device_attribute *attr,
	336	const char *buf,
	337	size_t len)
	338	{
	339	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	340	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	341	unsigned long data;
	342	int ret;
	343
	344	ret = strict_strtoul(buf, 10, &data);
	345
	346	if ((!ret) && (data < 0x100)) {
	347	ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data);
	348	chip->exec_setup = data;
	349	return len;
	350	}
	351
	352	return -EINVAL;
	353	}
	354
	355	static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO \| S_IWUSR,
	356	ad774x_show_exec_setup,
	357	ad774x_store_exec_setup);
	358
	359	static ssize_t ad774x_show_volt_gain(struct device *dev,
	360	struct device_attribute *attr,
	361	char *buf)
	362	{
	363	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	364	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	365
	366	return sprintf(buf, "%d\n", chip->volt_gain);
	367	}
	368
	369	static ssize_t ad774x_store_volt_gain(struct device *dev,
	370	struct device_attribute *attr,
	371	const char *buf,
	372	size_t len)
	373	{
	374	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	375	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	376	unsigned long data;
	377	int ret;
	378
	379	ret = strict_strtoul(buf, 10, &data);
	380
	381	if ((!ret) && (data < 0x10000)) {
	382	ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8);
	383	ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data);
	384	chip->volt_gain = data;
	385	return len;
	386	}
	387
	388	return -EINVAL;
	389	}
	390
	391	static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO \| S_IWUSR,
	392	ad774x_show_volt_gain,
	393	ad774x_store_volt_gain);
	394
	395	static ssize_t ad774x_show_cap_data(struct device *dev,
	396	struct device_attribute *attr,
	397	char *buf)
	398	{
	399	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	400	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	401	unsigned long data;
	402	char tmp[3];
	403
	404	ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3);
	405	data = ((int)tmp[0] << 16) \| ((int)tmp[1] << 8) \| (int)tmp[2];
	406
	407	return sprintf(buf, "%ld\n", data);
	408	}
	409
	410	static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data);
	411
	412	static ssize_t ad774x_show_vt_data(struct device *dev,
	413	struct device_attribute *attr,
	414	char *buf)
	415	{
	416	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	417	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	418	unsigned long data;
	419	char tmp[3];
	420
	421	ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3);
	422	data = ((int)tmp[0] << 16) \| ((int)tmp[1] << 8) \| (int)tmp[2];
	423
	424	return sprintf(buf, "%ld\n", data);
	425	}
	426
	427	static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data);
	428
	429	static ssize_t ad774x_show_cap_offs(struct device *dev,
	430	struct device_attribute *attr,
	431	char *buf)
	432	{
	433	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	434	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	435
	436	return sprintf(buf, "%d\n", chip->cap_offs);
	437	}
	438
	439	static ssize_t ad774x_store_cap_offs(struct device *dev,
	440	struct device_attribute *attr,
	441	const char *buf,
	442	size_t len)
	443	{
	444	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	445	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	446	unsigned long data;
	447	int ret;
	448
	449	ret = strict_strtoul(buf, 10, &data);
	450
	451	if ((!ret) && (data < 0x10000)) {
	452	ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8);
	453	ad774x_i2c_write(chip, AD774X_CAP_OFFL, data);
	454	chip->cap_offs = data;
	455	return len;
	456	}
	457
	458	return -EINVAL;
	459	}
	460
	461	static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO \| S_IWUSR,
	462	ad774x_show_cap_offs,
	463	ad774x_store_cap_offs);
	464
	465	static ssize_t ad774x_show_cap_gain(struct device *dev,
	466	struct device_attribute *attr,
	467	char *buf)
	468	{
	469	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	470	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	471
	472	return sprintf(buf, "%d\n", chip->cap_gain);
	473	}
	474
	475	static ssize_t ad774x_store_cap_gain(struct device *dev,
	476	struct device_attribute *attr,
	477	const char *buf,
	478	size_t len)
	479	{
	480	struct iio_dev *dev_info = dev_get_drvdata(dev);
febafb94	481	struct ad774x_chip_info *chip = iio_priv(dev_info);
671d85f2 BS	482	unsigned long data;
	483	int ret;
	484
	485	ret = strict_strtoul(buf, 10, &data);
	486
	487	if ((!ret) && (data < 0x10000)) {
	488	ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8);
	489	ad774x_i2c_write(chip, AD774X_CAP_GAINL, data);
	490	chip->cap_gain = data;
	491	return len;
	492	}
	493
	494	return -EINVAL;
	495	}
	496
	497	static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO \| S_IWUSR,
	498	ad774x_show_cap_gain,
	499	ad774x_store_cap_gain);
	500
671d85f2 BS	501	static struct attribute *ad774x_attributes[] = {
	502	&iio_dev_attr_available_conversion_modes.dev_attr.attr,
	503	&iio_dev_attr_conversion_mode.dev_attr.attr,
322c9563 JC	504	&iio_dev_attr_in_capacitance_setup.dev_attr.attr,
322c9563 JC	505	&iio_dev_attr_in_voltage0_setup.dev_attr.attr,
671d85f2	506	&iio_dev_attr_exec_setup.dev_attr.attr,
322c9563 JC	507	&iio_dev_attr_in_capacitance_offs.dev_attr.attr,
	508	&iio_dev_attr_in_capacitance_gain.dev_attr.attr,
	509	&iio_dev_attr_in_voltage0_gain.dev_attr.attr,
	510	&iio_dev_attr_in_voltage0_raw.dev_attr.attr,
	511	&iio_dev_attr_in_capacitance0_raw.dev_attr.attr,
	512	&iio_dev_attr_out_capacitance0_raw.dev_attr.attr,
	513	&iio_dev_attr_out_capacitance1_raw.dev_attr.attr,
671d85f2 BS	514	NULL,
	515	};
	516
	517	static const struct attribute_group ad774x_attribute_group = {
	518	.attrs = ad774x_attributes,
	519	};
	520
	521	/*
	522	* data ready events
	523	*/
	524
02db0bb3 JC	525	#define IIO_EVENT_CODE_CAP_RDY 0
02db0bb3 JC	526	#define IIO_EVENT_CODE_VT_RDY 1
671d85f2 BS	527
	528	#define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \
	529	IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask)
	530
	531	#define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \
	532	IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask)
	533
724cf92d	534	static irqreturn_t ad774x_event_handler(int irq, void *private)
671d85f2	535	{
724cf92d	536	struct iio_dev *indio_dev = private;
febafb94	537	struct ad774x_chip_info *chip = iio_priv(indio_dev);
671d85f2 BS	538	u8 int_status;
671d85f2 BS	539
671d85f2 BS	540	ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1);
	541
	542	if (int_status & AD774X_STATUS_RDYCAP)
5aa96188	543	iio_push_event(indio_dev,
724cf92d JC	544	IIO_EVENT_CODE_CAP_RDY,
724cf92d JC	545	iio_get_time_ns());
671d85f2 BS	546
671d85f2 BS	547	if (int_status & AD774X_STATUS_RDYVT)
5aa96188	548	iio_push_event(indio_dev,
724cf92d JC	549	IIO_EVENT_CODE_VT_RDY,
724cf92d JC	550	iio_get_time_ns());
671d85f2	551
724cf92d	552	return IRQ_HANDLED;
671d85f2 BS	553	}
671d85f2 BS	554
724cf92d JC	555	static IIO_CONST_ATTR(cap_rdy_en, "1");
724cf92d JC	556	static IIO_CONST_ATTR(vt_rdy_en, "1");
671d85f2 BS	557
671d85f2 BS	558	static struct attribute *ad774x_event_attributes[] = {
724cf92d JC	559	&iio_const_attr_cap_rdy_en.dev_attr.attr,
724cf92d JC	560	&iio_const_attr_vt_rdy_en.dev_attr.attr,
671d85f2 BS	561	NULL,
	562	};
	563
	564	static struct attribute_group ad774x_event_attribute_group = {
	565	.attrs = ad774x_event_attributes,
8e7d9672	566	.name = "events",
671d85f2 BS	567	};
671d85f2 BS	568
6fe8135f JC	569	static const struct iio_info ad774x_info = {
	570	.attrs = &ad774x_event_attribute_group,
	571	.event_attrs = &ad774x_event_attribute_group,
6fe8135f JC	572	.driver_module = THIS_MODULE,
6fe8135f JC	573	};
671d85f2 BS	574	/*
	575	* device probe and remove
	576	*/
	577
	578	static int __devinit ad774x_probe(struct i2c_client *client,
	579	const struct i2c_device_id *id)
	580	{
26d25ae3	581	int ret;
febafb94 JC	582	struct ad774x_chip_info *chip;
	583	struct iio_dev *indio_dev;
	584
	585	indio_dev = iio_allocate_device(sizeof(*chip));
	586	if (indio_dev == NULL) {
671d85f2 BS	587	ret = -ENOMEM;
	588	goto error_ret;
	589	}
febafb94	590	chip = iio_priv(indio_dev);
671d85f2	591	/* this is only used for device removal purposes */
febafb94	592	i2c_set_clientdata(client, indio_dev);
671d85f2 BS	593
671d85f2 BS	594	chip->client = client;
671d85f2	595
671d85f2	596	/* Establish that the iio_dev is a child of the i2c device */
febafb94 JC	597	indio_dev->name = id->name;
	598	indio_dev->dev.parent = &client->dev;
	599	indio_dev->info = &ad774x_info;
	600	indio_dev->modes = INDIO_DIRECT_MODE;
671d85f2	601
671d85f2	602	if (client->irq) {
724cf92d JC	603	ret = request_threaded_irq(client->irq,
	604	NULL,
	605	&ad774x_event_handler,
	606	IRQF_TRIGGER_FALLING,
	607	"ad774x",
febafb94	608	indio_dev);
671d85f2 BS	609	if (ret)
671d85f2 BS	610	goto error_free_dev;
671d85f2 BS	611	}
671d85f2 BS	612
26d25ae3 JC	613	ret = iio_device_register(indio_dev);
	614	if (ret)
	615	goto error_free_irq;
	616
671d85f2 BS	617	dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq);
	618
	619	return 0;
	620
26d25ae3 JC	621	error_free_irq:
26d25ae3 JC	622	free_irq(client->irq, indio_dev);
671d85f2	623	error_free_dev:
26d25ae3	624	iio_free_device(indio_dev);
671d85f2 BS	625	error_ret:
	626	return ret;
	627	}
	628
	629	static int __devexit ad774x_remove(struct i2c_client *client)
	630	{
febafb94	631	struct iio_dev *indio_dev = i2c_get_clientdata(client);
671d85f2 BS	632
671d85f2 BS	633	if (client->irq)
724cf92d	634	free_irq(client->irq, indio_dev);
671d85f2	635	iio_device_unregister(indio_dev);
671d85f2 BS	636
	637	return 0;
	638	}
	639
	640	static const struct i2c_device_id ad774x_id[] = {
	641	{ "ad7745", 0 },
	642	{ "ad7746", 0 },
	643	{ "ad7747", 0 },
	644	{}
	645	};
	646
	647	MODULE_DEVICE_TABLE(i2c, ad774x_id);
	648
	649	static struct i2c_driver ad774x_driver = {
	650	.driver = {
	651	.name = "ad774x",
	652	},
	653	.probe = ad774x_probe,
	654	.remove = __devexit_p(ad774x_remove),
	655	.id_table = ad774x_id,
	656	};
	657
	658	static __init int ad774x_init(void)
	659	{
	660	return i2c_add_driver(&ad774x_driver);
	661	}
	662
	663	static __exit void ad774x_exit(void)
	664	{
	665	i2c_del_driver(&ad774x_driver);
	666	}
	667
	668	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	669	MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver");
	670	MODULE_LICENSE("GPL v2");
	671
	672	module_init(ad774x_init);
	673	module_exit(ad774x_exit);