1 files changed, 676 insertions, 0 deletions

diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
new file mode 100644
index 0000000..a761ca9
--- /dev/null
+++ b/drivers/staging/iio/cdc/ad7150.c
@@ -0,0 +1,676 @@
+/*
+ * AD7150 capacitive sensor driver supporting AD7150/1/6
+ *
+ * Copyright 2010-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * AD7150 registers definition
+ */
+
+#define AD7150_STATUS              0
+#define AD7150_STATUS_OUT1         (1 << 3)
+#define AD7150_STATUS_OUT2         (1 << 5)
+#define AD7150_CH1_DATA_HIGH       1
+#define AD7150_CH2_DATA_HIGH       3
+#define AD7150_CH1_AVG_HIGH        5
+#define AD7150_CH2_AVG_HIGH        7
+#define AD7150_CH1_SENSITIVITY     9
+#define AD7150_CH1_THR_HOLD_H      9
+#define AD7150_CH1_TIMEOUT         10
+#define AD7150_CH1_SETUP           11
+#define AD7150_CH2_SENSITIVITY     12
+#define AD7150_CH2_THR_HOLD_H      12
+#define AD7150_CH2_TIMEOUT         13
+#define AD7150_CH2_SETUP           14
+#define AD7150_CFG                 15
+#define AD7150_CFG_FIX             (1 << 7)
+#define AD7150_PD_TIMER            16
+#define AD7150_CH1_CAPDAC          17
+#define AD7150_CH2_CAPDAC          18
+#define AD7150_SN3                 19
+#define AD7150_SN2                 20
+#define AD7150_SN1                 21
+#define AD7150_SN0                 22
+#define AD7150_ID                  23
+
+/**
+ * struct ad7150_chip_info - instance specific chip data
+ * @client: i2c client for this device
+ * @current_event: device always has one type of event enabled.
+ *	This element stores the event code of the current one.
+ * @threshold: thresholds for simple capacitance value events
+ * @thresh_sensitivity: threshold for simple capacitance offset
+ *	from 'average' value.
+ * @mag_sensitity: threshold for magnitude of capacitance offset from
+ *	from 'average' value.
+ * @thresh_timeout: a timeout, in samples from the moment an
+ *	adaptive threshold event occurs to when the average
+ *	value jumps to current value.
+ * @mag_timeout: a timeout, in sample from the moment an
+ *	adaptive magnitude event occurs to when the average
+ *	value jumps to the current value.
+ * @old_state: store state from previous event, allowing confirmation
+ *	of new condition.
+ * @conversion_mode: the current conversion mode.
+ * @state_lock: ensure consistent state of this structure wrt the
+ *	hardware.
+ */
+struct ad7150_chip_info {
+	struct i2c_client *client;
+	u64 current_event;
+	u16 threshold[2][2];
+	u8 thresh_sensitivity[2][2];
+	u8 mag_sensitivity[2][2];
+	u8 thresh_timeout[2][2];
+	u8 mag_timeout[2][2];
+	int old_state;
+	char *conversion_mode;
+	struct mutex state_lock;
+};
+
+/*
+ * sysfs nodes
+ */
+
+static const u8 ad7150_addresses[][6] = {
+	{ AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH,
+	  AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H,
+	  AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT },
+	{ AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH,
+	  AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H,
+	  AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT },
+};
+
+static int ad7150_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long mask)
+{
+	int ret;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+
+	switch (mask) {
+	case 0:
+		ret = i2c_smbus_read_word_data(chip->client,
+					ad7150_addresses[chan->channel][0]);
+		if (ret < 0)
+			return ret;
+		*val = swab16(ret);
+		return IIO_VAL_INT;
+	case (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE):
+		ret = i2c_smbus_read_word_data(chip->client,
+					ad7150_addresses[chan->channel][1]);
+		if (ret < 0)
+			return ret;
+		*val = swab16(ret);
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad7150_read_event_config(struct iio_dev *indio_dev, u64 event_code)
+{
+	int ret;
+	u8 threshtype;
+	bool adaptive;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+			IIO_EV_DIR_RISING);
+
+	ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
+	if (ret < 0)
+		return ret;
+
+	threshtype = (ret >> 5) & 0x03;
+	adaptive = !!(ret & 0x80);
+
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		if (rising)
+			return adaptive && (threshtype == 0x1);
+		else
+			return adaptive && (threshtype == 0x0);
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		if (rising)
+			return adaptive && (threshtype == 0x3);
+		else
+			return adaptive && (threshtype == 0x2);
+
+	case IIO_EV_TYPE_THRESH:
+		if (rising)
+			return !adaptive && (threshtype == 0x1);
+		else
+			return !adaptive && (threshtype == 0x0);
+	};
+	return -EINVAL;
+}
+
+/* lock should be held */
+static int ad7150_write_event_params(struct iio_dev *indio_dev, u64 event_code)
+{
+	int ret;
+	u16 value;
+	u8 sens, timeout;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+			IIO_EV_DIR_RISING);
+
+	if (event_code != chip->current_event)
+		return 0;
+
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+		/* Note completely different from the adaptive versions */
+	case IIO_EV_TYPE_THRESH:
+		value = chip->threshold[rising][chan];
+		ret = i2c_smbus_write_word_data(chip->client,
+						ad7150_addresses[chan][3],
+						swab16(value));
+		if (ret < 0)
+			return ret;
+		return 0;
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		sens = chip->mag_sensitivity[rising][chan];
+		timeout = chip->mag_timeout[rising][chan];
+		break;
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		sens = chip->thresh_sensitivity[rising][chan];
+		timeout = chip->thresh_timeout[rising][chan];
+		break;
+	default:
+		return -EINVAL;
+	};
+	ret = i2c_smbus_write_byte_data(chip->client,
+					ad7150_addresses[chan][4],
+					sens);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(chip->client,
+					ad7150_addresses[chan][5],
+					timeout);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int ad7150_write_event_config(struct iio_dev *indio_dev,
+				     u64 event_code, int state)
+{
+	u8 thresh_type, cfg, adaptive;
+	int ret;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+			IIO_EV_DIR_RISING);
+
+	/* Something must always be turned on */
+	if (state == 0)
+		return -EINVAL;
+
+	if (event_code == chip->current_event)
+		return 0;
+	mutex_lock(&chip->state_lock);
+	ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
+	if (ret < 0)
+		goto error_ret;
+
+	cfg = ret & ~((0x03 << 5) | (0x1 << 7));
+
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		adaptive = 1;
+		if (rising)
+			thresh_type = 0x1;
+		else
+			thresh_type = 0x0;
+		break;
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		adaptive = 1;
+		if (rising)
+			thresh_type = 0x3;
+		else
+			thresh_type = 0x2;
+		break;
+	case IIO_EV_TYPE_THRESH:
+		adaptive = 0;
+		if (rising)
+			thresh_type = 0x1;
+		else
+			thresh_type = 0x0;
+		break;
+	default:
+		ret = -EINVAL;
+		goto error_ret;
+	};
+
+	cfg |= (!adaptive << 7) | (thresh_type << 5);
+
+	ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
+	if (ret < 0)
+		goto error_ret;
+
+	chip->current_event = event_code;
+
+	/* update control attributes */
+	ret = ad7150_write_event_params(indio_dev, event_code);
+error_ret:
+	mutex_unlock(&chip->state_lock);
+
+	return 0;
+}
+
+static int ad7150_read_event_value(struct iio_dev *indio_dev,
+				   u64 event_code,
+				   int *val)
+{
+	int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+			IIO_EV_DIR_RISING);
+
+	/* Complex register sharing going on here */
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		*val = chip->mag_sensitivity[rising][chan];
+		return 0;
+
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		*val = chip->thresh_sensitivity[rising][chan];
+		return 0;
+
+	case IIO_EV_TYPE_THRESH:
+		*val = chip->threshold[rising][chan];
+		return 0;
+
+	default:
+		return -EINVAL;
+	};
+}
+
+static int ad7150_write_event_value(struct iio_dev *indio_dev,
+				   u64 event_code,
+				   int val)
+{
+	int ret;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+			IIO_EV_DIR_RISING);
+
+	mutex_lock(&chip->state_lock);
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		chip->mag_sensitivity[rising][chan] = val;
+		break;
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		chip->thresh_sensitivity[rising][chan] = val;
+		break;
+	case IIO_EV_TYPE_THRESH:
+		chip->threshold[rising][chan] = val;
+		break;
+	default:
+		ret = -EINVAL;
+		goto error_ret;
+	};
+
+	/* write back if active */
+	ret = ad7150_write_event_params(indio_dev, event_code);
+
+error_ret:
+	mutex_unlock(&chip->state_lock);
+	return ret;
+}
+
+static ssize_t ad7150_show_timeout(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	u8 value;
+
+	/* use the event code for consistency reasons */
+	int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
+			== IIO_EV_DIR_RISING);
+
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		value = chip->mag_timeout[rising][chan];
+		break;
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		value = chip->thresh_timeout[rising][chan];
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t ad7150_store_timeout(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf,
+		size_t len)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
+	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) ==
+			IIO_EV_DIR_RISING);
+	u8 data;
+	int ret;
+
+	ret = kstrtou8(buf, 10, &data);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&chip->state_lock);
+	switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
+	case IIO_EV_TYPE_MAG_ADAPTIVE:
+		chip->mag_timeout[rising][chan] = data;
+		break;
+	case IIO_EV_TYPE_THRESH_ADAPTIVE:
+		chip->thresh_timeout[rising][chan] = data;
+		break;
+	default:
+		ret = -EINVAL;
+		goto error_ret;
+	};
+
+	ret = ad7150_write_event_params(indio_dev, this_attr->address);
+error_ret:
+	mutex_unlock(&chip->state_lock);
+
+	if (ret < 0)
+		return ret;
+
+	return len;
+}
+
+#define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir)		\
+	IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
+		S_IRUGO | S_IWUSR,					\
+		&ad7150_show_timeout,					\
+		&ad7150_store_timeout,					\
+		IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,			\
+				     chan,				\
+				     IIO_EV_TYPE_##ev_type,		\
+				     IIO_EV_DIR_##ev_dir))
+static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
+
+static const struct iio_chan_spec ad7150_channels[] = {
+	{
+		.type = IIO_CAPACITANCE,
+		.indexed = 1,
+		.channel = 0,
+		.info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
+		.event_mask =
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
+		IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
+	}, {
+		.type = IIO_CAPACITANCE,
+		.indexed = 1,
+		.channel = 1,
+		.info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
+		.event_mask =
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
+		IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
+		IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
+	},
+};
+
+/*
+ * threshold events
+ */
+
+static irqreturn_t ad7150_event_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct ad7150_chip_info *chip = iio_priv(indio_dev);
+	u8 int_status;
+	s64 timestamp = iio_get_time_ns();
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
+	if (ret < 0)
+		return IRQ_HANDLED;
+
+	int_status = ret;
+
+	if ((int_status & AD7150_STATUS_OUT1) &&
+	    !(chip->old_state & AD7150_STATUS_OUT1))
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
+						    0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_RISING),
+				timestamp);
+	else if ((!(int_status & AD7150_STATUS_OUT1)) &&
+		 (chip->old_state & AD7150_STATUS_OUT1))
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
+						    0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_FALLING),
+			       timestamp);
+
+	if ((int_status & AD7150_STATUS_OUT2) &&
+	    !(chip->old_state & AD7150_STATUS_OUT2))
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
+						    1,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_RISING),
+			       timestamp);
+	else if ((!(int_status & AD7150_STATUS_OUT2)) &&
+		 (chip->old_state & AD7150_STATUS_OUT2))
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
+						    1,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_FALLING),
+			       timestamp);
+	/* store the status to avoid repushing same events */
+	chip->old_state = int_status;
+
+	return IRQ_HANDLED;
+}
+
+/* Timeouts not currently handled by core */
+static struct attribute *ad7150_event_attributes[] = {
+	&iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
+	.dev_attr.attr,
+	&iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
+	.dev_attr.attr,
+	NULL,
+};
+
+static struct attribute_group ad7150_event_attribute_group = {
+	.attrs = ad7150_event_attributes,
+	.name = "events",
+};
+
+static const struct iio_info ad7150_info = {
+	.event_attrs = &ad7150_event_attribute_group,
+	.driver_module = THIS_MODULE,
+	.read_raw = &ad7150_read_raw,
+	.read_event_config = &ad7150_read_event_config,
+	.write_event_config = &ad7150_write_event_config,
+	.read_event_value = &ad7150_read_event_value,
+	.write_event_value = &ad7150_write_event_value,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad7150_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	int ret;
+	struct ad7150_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);
+	mutex_init(&chip->state_lock);
+	/* this is only used for device removal purposes */
+	i2c_set_clientdata(client, indio_dev);
+
+	chip->client = client;
+
+	indio_dev->name = id->name;
+	indio_dev->channels = ad7150_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
+	/* Establish that the iio_dev is a child of the i2c device */
+	indio_dev->dev.parent = &client->dev;
+
+	indio_dev->info = &ad7150_info;
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	if (client->irq) {
+		ret = request_threaded_irq(client->irq,
+					   NULL,
+					   &ad7150_event_handler,
+					   IRQF_TRIGGER_RISING |
+					   IRQF_TRIGGER_FALLING,
+					   "ad7150_irq1",
+					   indio_dev);
+		if (ret)
+			goto error_free_dev;
+	}
+
+	if (client->dev.platform_data) {
+		ret = request_threaded_irq(*(unsigned int *)
+					   client->dev.platform_data,
+					   NULL,
+					   &ad7150_event_handler,
+					   IRQF_TRIGGER_RISING |
+					   IRQF_TRIGGER_FALLING,
+					   "ad7150_irq2",
+					   indio_dev);
+		if (ret)
+			goto error_free_irq;
+	}
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_free_irq2;
+
+	dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
+		 id->name, client->irq);
+
+	return 0;
+error_free_irq2:
+	if (client->dev.platform_data)
+		free_irq(*(unsigned int *)client->dev.platform_data,
+			 indio_dev);
+error_free_irq:
+	if (client->irq)
+		free_irq(client->irq, indio_dev);
+error_free_dev:
+	iio_free_device(indio_dev);
+error_ret:
+	return ret;
+}
+
+static int __devexit ad7150_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+	iio_device_unregister(indio_dev);
+	if (client->irq)
+		free_irq(client->irq, indio_dev);
+
+	if (client->dev.platform_data)
+		free_irq(*(unsigned int *)client->dev.platform_data, indio_dev);
+
+	iio_free_device(indio_dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id ad7150_id[] = {
+	{ "ad7150", 0 },
+	{ "ad7151", 0 },
+	{ "ad7156", 0 },
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad7150_id);
+
+static struct i2c_driver ad7150_driver = {
+	.driver = {
+		.name = "ad7150",
+	},
+	.probe = ad7150_probe,
+	.remove = __devexit_p(ad7150_remove),
+	.id_table = ad7150_id,
+};
+
+static __init int ad7150_init(void)
+{
+	return i2c_add_driver(&ad7150_driver);
+}
+
+static __exit void ad7150_exit(void)
+{
+	i2c_del_driver(&ad7150_driver);
+}
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad7150_init);
+module_exit(ad7150_exit);