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Commit 671d85f2 authored by Barry Song's avatar Barry Song Committed by Greg Kroah-Hartman
Browse files

staging: iio: adc: new driver for AD7745/6/7 devices 



Signed-off-by: default avatarBarry Song <barry.song@analog.com>
Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent f84c26e6

drivers/staging/iio/adc/Kconfig

+12 −2
Original line number Diff line number Diff line
@@ -96,3 +96,13 @@ config AD7476 


	  To compile this driver as a module, choose M here: the

	  module will be called ad7476.



config AD7745

	tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"

	depends on I2C

	help

	  Say yes here to build support for Analog Devices capacitive sensors.

	  (AD7745, AD7746, AD7747) Provides direct access via sysfs.



	  To compile this driver as a module, choose M here: the

	  module will be called ad7745.

drivers/staging/iio/adc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,3 +20,4 @@ obj-$(CONFIG_AD7152) += ad7152.o 
obj-$(CONFIG_AD7291) += ad7291.o

obj-$(CONFIG_AD7298) += ad7298.o

obj-$(CONFIG_AD7314) += ad7314.o

obj-$(CONFIG_AD7745) += ad7745.o

drivers/staging/iio/adc/ad7745.c

0 → 100644
+734 −0
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/workqueue.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/rtc.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 {

	const char *name;

	struct i2c_client *client;

	struct iio_dev *indio_dev;

	struct work_struct thresh_work;

	bool inter;

	s64 last_timestamp;

	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;

};



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(cap_setup, _mode, _show, _store, 0)

#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store)              \

	IIO_DEVICE_ATTR(in0_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(in0_gain, _mode, _show, _store, 0)

#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store)		\

	IIO_DEVICE_ATTR(cap_offs, _mode, _show, _store, 0)

#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store)		\

	IIO_DEVICE_ATTR(cap_gain, _mode, _show, _store, 0)

#define IIO_DEV_ATTR_CAP_DATA(_show)		\

	IIO_DEVICE_ATTR(cap0_raw, S_IRUGO, _show, NULL, 0)

#define IIO_DEV_ATTR_VT_DATA(_show)		\

	IIO_DEVICE_ATTR(in0_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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;

	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 = dev_info->dev_data;

	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(capdac0_raw, S_IRUGO | S_IWUSR,

			ad774x_show_dac_value,

			ad774x_store_dac_value,

			AD774X_CAPDACA);



static IIO_DEVICE_ATTR(capdac1_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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;

	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 = dev_info->dev_data;

	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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 = dev_info->dev_data;



	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 = dev_info->dev_data;

	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 ssize_t ad774x_show_name(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	struct iio_dev *dev_info = dev_get_drvdata(dev);

	struct ad774x_chip_info *chip = dev_info->dev_data;

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

}



static IIO_DEVICE_ATTR(name, S_IRUGO, ad774x_show_name, NULL, 0);



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_cap_setup.dev_attr.attr,

	&iio_dev_attr_in0_setup.dev_attr.attr,

	&iio_dev_attr_exec_setup.dev_attr.attr,

	&iio_dev_attr_cap_offs.dev_attr.attr,

	&iio_dev_attr_cap_gain.dev_attr.attr,

	&iio_dev_attr_in0_gain.dev_attr.attr,

	&iio_dev_attr_in0_raw.dev_attr.attr,

	&iio_dev_attr_cap0_raw.dev_attr.attr,

	&iio_dev_attr_capdac0_raw.dev_attr.attr,

	&iio_dev_attr_capdac1_raw.dev_attr.attr,

	&iio_dev_attr_name.dev_attr.attr,

	NULL,

};



static const struct attribute_group ad774x_attribute_group = {

	.attrs = ad774x_attributes,

};



/*

 * data ready events

 */



#define IIO_EVENT_CODE_CAP_RDY     IIO_BUFFER_EVENT_CODE(0)

#define IIO_EVENT_CODE_VT_RDY      IIO_BUFFER_EVENT_CODE(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 void ad774x_interrupt_handler_bh(struct work_struct *work_s)

{

	struct ad774x_chip_info *chip =

		container_of(work_s, struct ad774x_chip_info, thresh_work);

	u8 int_status;



	enable_irq(chip->client->irq);



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



	if (int_status & AD774X_STATUS_RDYCAP)

		iio_push_event(chip->indio_dev, 0,

				IIO_EVENT_CODE_CAP_RDY,

				chip->last_timestamp);



	if (int_status & AD774X_STATUS_RDYVT)

		iio_push_event(chip->indio_dev, 0,

				IIO_EVENT_CODE_VT_RDY,

				chip->last_timestamp);

}



static int ad774x_interrupt_handler_th(struct iio_dev *dev_info,

		int index,

		s64 timestamp,

		int no_test)

{

	struct ad774x_chip_info *chip = dev_info->dev_data;



	chip->last_timestamp = timestamp;

	schedule_work(&chip->thresh_work);



	return 0;

}



IIO_EVENT_SH(data_rdy, &ad774x_interrupt_handler_th);



static ssize_t ad774x_query_out_mode(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	/*

	 * AD774X provides one /RDY pin, which can be used as interrupt

	 * but the pin is not configurable

	 */

	return sprintf(buf, "1\n");

}



static ssize_t ad774x_set_out_mode(struct device *dev,

		struct device_attribute *attr,

		const char *buf,

		size_t len)

{

	return len;

}



IIO_EVENT_ATTR_CAP_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);

IIO_EVENT_ATTR_VT_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);



static struct attribute *ad774x_event_attributes[] = {

	&iio_event_attr_cap_rdy.dev_attr.attr,

	&iio_event_attr_vt_rdy.dev_attr.attr,

	NULL,

};



static struct attribute_group ad774x_event_attribute_group = {

	.attrs = ad774x_event_attributes,

};



/*

 * device probe and remove

 */



static int __devinit ad774x_probe(struct i2c_client *client,

		const struct i2c_device_id *id)

{

	int ret = 0, regdone = 0;

	struct ad774x_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL);

	if (chip == NULL) {

		ret = -ENOMEM;

		goto error_ret;

	}



	/* this is only used for device removal purposes */

	i2c_set_clientdata(client, chip);



	chip->client = client;

	chip->name = id->name;



	chip->indio_dev = iio_allocate_device();

	if (chip->indio_dev == NULL) {

		ret = -ENOMEM;

		goto error_free_chip;

	}



	/* Establish that the iio_dev is a child of the i2c device */

	chip->indio_dev->dev.parent = &client->dev;

	chip->indio_dev->attrs = &ad774x_attribute_group;

	chip->indio_dev->event_attrs = &ad774x_event_attribute_group;

	chip->indio_dev->dev_data = (void *)(chip);

	chip->indio_dev->driver_module = THIS_MODULE;

	chip->indio_dev->num_interrupt_lines = 1;

	chip->indio_dev->modes = INDIO_DIRECT_MODE;



	ret = iio_device_register(chip->indio_dev);

	if (ret)

		goto error_free_dev;

	regdone = 1;



	if (client->irq) {

		ret = iio_register_interrupt_line(client->irq,

				chip->indio_dev,

				0,

				IRQF_TRIGGER_FALLING,

				"ad774x");

		if (ret)

			goto error_free_dev;



		iio_add_event_to_list(iio_event_attr_cap_rdy.listel,

				&chip->indio_dev->interrupts[0]->ev_list);



		INIT_WORK(&chip->thresh_work, ad774x_interrupt_handler_bh);

	}



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



	return 0;



error_free_dev:

	if (regdone)

		iio_device_unregister(chip->indio_dev);

	else

		iio_free_device(chip->indio_dev);

error_free_chip:

	kfree(chip);

error_ret:

	return ret;

}



static int __devexit ad774x_remove(struct i2c_client *client)

{

	struct ad774x_chip_info *chip = i2c_get_clientdata(client);

	struct iio_dev *indio_dev = chip->indio_dev;



	if (client->irq)

		iio_unregister_interrupt_line(indio_dev, 0);

	iio_device_unregister(indio_dev);

	kfree(chip);



	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);