drivers/iio/light/tcs3472.c - kernel/msm-4.9 - Gitiles

 /*
  * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
  *
  * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
  *
  * This file is subject to the terms and conditions of version 2 of
  * the GNU General Public License.  See the file COPYING in the main
  * directory of this archive for more details.
  *
  * Color light sensor with 16-bit channels for red, green, blue, clear);
  * 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
  * TCS34727)
  *
  * TODO: interrupt support, thresholds, wait time
  */

 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/pm.h>

 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/triggered_buffer.h>

 #define TCS3472_DRV_NAME "tcs3472"

 #define TCS3472_COMMAND BIT(7)
 #define TCS3472_AUTO_INCR BIT(5)

 #define TCS3472_ENABLE (TCS3472_COMMAND | 0x00)
 #define TCS3472_ATIME (TCS3472_COMMAND | 0x01)
 #define TCS3472_WTIME (TCS3472_COMMAND | 0x03)
 #define TCS3472_AILT (TCS3472_COMMAND | 0x04)
 #define TCS3472_AIHT (TCS3472_COMMAND | 0x06)
 #define TCS3472_PERS (TCS3472_COMMAND | 0x0c)
 #define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d)
 #define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f)
 #define TCS3472_ID (TCS3472_COMMAND | 0x12)
 #define TCS3472_STATUS (TCS3472_COMMAND | 0x13)
 #define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14)
 #define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16)
 #define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18)
 #define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a)

 #define TCS3472_STATUS_AVALID BIT(0)
 #define TCS3472_ENABLE_AEN BIT(1)
 #define TCS3472_ENABLE_PON BIT(0)
 #define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1))

 struct tcs3472_data {
 	struct i2c_client *client;
 	struct mutex lock;
 	u8 enable;
 	u8 control;
 	u8 atime;
 	u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
 };

 #define TCS3472_CHANNEL(_color, _si, _addr) { \
 	.type = IIO_INTENSITY, \
 	.modified = 1, \
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \
 		BIT(IIO_CHAN_INFO_INT_TIME), \
 	.channel2 = IIO_MOD_LIGHT_##_color, \
 	.address = _addr, \
 	.scan_index = _si, \
 	.scan_type = { \
 		.sign = 'u', \
 		.realbits = 16, \
 		.storagebits = 16, \
 		.endianness = IIO_CPU, \
 	}, \
 }

 static const int tcs3472_agains[] = { 1, 4, 16, 60 };

 static const struct iio_chan_spec tcs3472_channels[] = {
 	TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
 	TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
 	TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
 	TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
 	IIO_CHAN_SOFT_TIMESTAMP(4),
 };

 static int tcs3472_req_data(struct tcs3472_data *data)
 {
 	int tries = 50;
 	int ret;

 	while (tries--) {
 		ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
 		if (ret < 0)
 			return ret;
 		if (ret & TCS3472_STATUS_AVALID)
 			break;
 		msleep(20);
 	}

 	if (tries < 0) {
 		dev_err(&data->client->dev, "data not ready\n");
 		return -EIO;
 	}

 	return 0;
 }

 static int tcs3472_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long mask)
 {
 	struct tcs3472_data *data = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		if (iio_buffer_enabled(indio_dev))
 			return -EBUSY;

 		mutex_lock(&data->lock);
 		ret = tcs3472_req_data(data);
 		if (ret < 0) {
 			mutex_unlock(&data->lock);
 			return ret;
 		}
 		ret = i2c_smbus_read_word_data(data->client, chan->address);
 		mutex_unlock(&data->lock);
 		if (ret < 0)
 			return ret;
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBSCALE:
 		*val = tcs3472_agains[data->control &
 			TCS3472_CONTROL_AGAIN_MASK];
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_INT_TIME:
 		*val = 0;
 		*val2 = (256 - data->atime) * 2400;
 		return IIO_VAL_INT_PLUS_MICRO;
 	}
 	return -EINVAL;
 }

 static int tcs3472_write_raw(struct iio_dev *indio_dev,
 			       struct iio_chan_spec const *chan,
 			       int val, int val2, long mask)
 {
 	struct tcs3472_data *data = iio_priv(indio_dev);
 	int i;

 	switch (mask) {
 	case IIO_CHAN_INFO_CALIBSCALE:
 		if (val2 != 0)
 			return -EINVAL;
 		for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) {
 			if (val == tcs3472_agains[i]) {
 				data->control &= ~TCS3472_CONTROL_AGAIN_MASK;
 				data->control |= i;
 				return i2c_smbus_write_byte_data(
 					data->client, TCS3472_CONTROL,
 					data->control);
 			}
 		}
 		return -EINVAL;
 	case IIO_CHAN_INFO_INT_TIME:
 		if (val != 0)
 			return -EINVAL;
 		for (i = 0; i < 256; i++) {
 			if (val2 == (256 - i) * 2400) {
 				data->atime = i;
 				return i2c_smbus_write_word_data(
 					data->client, TCS3472_ATIME,
 					data->atime);
 			}

 		}
 		return -EINVAL;
 	}
 	return -EINVAL;
 }

 static irqreturn_t tcs3472_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct tcs3472_data *data = iio_priv(indio_dev);
 	int i, j = 0;

 	int ret = tcs3472_req_data(data);
 	if (ret < 0)
 		goto done;

 	for_each_set_bit(i, indio_dev->active_scan_mask,
 		indio_dev->masklength) {
 		ret = i2c_smbus_read_word_data(data->client,
 			TCS3472_CDATA + 2*i);
 		if (ret < 0)
 			goto done;

 		data->buffer[j++] = ret;
 	}

 	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 		iio_get_time_ns());

 done:
 	iio_trigger_notify_done(indio_dev->trig);

 	return IRQ_HANDLED;
 }

 static ssize_t tcs3472_show_int_time_available(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
 {
 	size_t len = 0;
 	int i;

 	for (i = 1; i <= 256; i++)
 		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
 			2400 * i);

 	/* replace trailing space by newline */
 	buf[len - 1] = '\n';

 	return len;
 }

 static IIO_CONST_ATTR(calibscale_available, "1 4 16 60");
 static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available);

 static struct attribute *tcs3472_attributes[] = {
 	&iio_const_attr_calibscale_available.dev_attr.attr,
 	&iio_dev_attr_integration_time_available.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group tcs3472_attribute_group = {
 	.attrs = tcs3472_attributes,
 };

 static const struct iio_info tcs3472_info = {
 	.read_raw = tcs3472_read_raw,
 	.write_raw = tcs3472_write_raw,
 	.attrs = &tcs3472_attribute_group,
 	.driver_module = THIS_MODULE,
 };

 static int tcs3472_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	struct tcs3472_data *data;
 	struct iio_dev *indio_dev;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (indio_dev == NULL)
 		return -ENOMEM;

 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
 	mutex_init(&data->lock);

 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &tcs3472_info;
 	indio_dev->name = TCS3472_DRV_NAME;
 	indio_dev->channels = tcs3472_channels;
 	indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);
 	if (ret < 0)
 		return ret;

 	if (ret == 0x44)
 		dev_info(&client->dev, "TCS34721/34725 found\n");
 	else if (ret == 0x4d)
 		dev_info(&client->dev, "TCS34723/34727 found\n");
 	else
 		return -ENODEV;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);
 	if (ret < 0)
 		return ret;
 	data->control = ret;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);
 	if (ret < 0)
 		return ret;
 	data->atime = ret;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);
 	if (ret < 0)
 		return ret;

 	/* enable device */
 	data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN;
 	ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
 		data->enable);
 	if (ret < 0)
 		return ret;

 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
 		tcs3472_trigger_handler, NULL);
 	if (ret < 0)
 		return ret;

 	ret = iio_device_register(indio_dev);
 	if (ret < 0)
 		goto buffer_cleanup;

 	return 0;

 buffer_cleanup:
 	iio_triggered_buffer_cleanup(indio_dev);
 	return ret;
 }

 static int tcs3472_powerdown(struct tcs3472_data *data)
 {
 	return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
 		data->enable & ~(TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON));
 }

 static int tcs3472_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);

 	iio_device_unregister(indio_dev);
 	iio_triggered_buffer_cleanup(indio_dev);
 	tcs3472_powerdown(iio_priv(indio_dev));

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int tcs3472_suspend(struct device *dev)
 {
 	struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev)));
 	return tcs3472_powerdown(data);
 }

 static int tcs3472_resume(struct device *dev)
 {
 	struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev)));
 	return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
 		data->enable | (TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON));
 }
 #endif

 static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);

 static const struct i2c_device_id tcs3472_id[] = {
 	{ "tcs3472", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tcs3472_id);

 static struct i2c_driver tcs3472_driver = {
 	.driver = {
 		.name	= TCS3472_DRV_NAME,
 		.pm	= &tcs3472_pm_ops,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= tcs3472_probe,
 	.remove		= tcs3472_remove,
 	.id_table	= tcs3472_id,
 };
 module_i2c_driver(tcs3472_driver);

 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 MODULE_DESCRIPTION("TCS3472 color light sensors driver");
 MODULE_LICENSE("GPL");
	/*
	* tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
	*
	* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
	*
	* This file is subject to the terms and conditions of version 2 of
	* the GNU General Public License. See the file COPYING in the main
	* directory of this archive for more details.
	*
	* Color light sensor with 16-bit channels for red, green, blue, clear);
	* 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
	* TCS34727)
	*
	* TODO: interrupt support, thresholds, wait time
	*/

	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/delay.h>
	#include <linux/pm.h>

	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/iio/trigger_consumer.h>
	#include <linux/iio/buffer.h>
	#include <linux/iio/triggered_buffer.h>

	#define TCS3472_DRV_NAME "tcs3472"

	#define TCS3472_COMMAND BIT(7)
	#define TCS3472_AUTO_INCR BIT(5)

	#define TCS3472_ENABLE (TCS3472_COMMAND \| 0x00)
	#define TCS3472_ATIME (TCS3472_COMMAND \| 0x01)
	#define TCS3472_WTIME (TCS3472_COMMAND \| 0x03)
	#define TCS3472_AILT (TCS3472_COMMAND \| 0x04)
	#define TCS3472_AIHT (TCS3472_COMMAND \| 0x06)
	#define TCS3472_PERS (TCS3472_COMMAND \| 0x0c)
	#define TCS3472_CONFIG (TCS3472_COMMAND \| 0x0d)
	#define TCS3472_CONTROL (TCS3472_COMMAND \| 0x0f)
	#define TCS3472_ID (TCS3472_COMMAND \| 0x12)
	#define TCS3472_STATUS (TCS3472_COMMAND \| 0x13)
	#define TCS3472_CDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x14)
	#define TCS3472_RDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x16)
	#define TCS3472_GDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x18)
	#define TCS3472_BDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x1a)

	#define TCS3472_STATUS_AVALID BIT(0)
	#define TCS3472_ENABLE_AEN BIT(1)
	#define TCS3472_ENABLE_PON BIT(0)
	#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) \| BIT(1))

	struct tcs3472_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 enable;
	u8 control;
	u8 atime;
	u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
	};

	#define TCS3472_CHANNEL(_color, _si, _addr) { \
	.type = IIO_INTENSITY, \
	.modified = 1, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) \| \
	BIT(IIO_CHAN_INFO_INT_TIME), \
	.channel2 = IIO_MOD_LIGHT_##_color, \
	.address = _addr, \
	.scan_index = _si, \
	.scan_type = { \
	.sign = 'u', \
	.realbits = 16, \
	.storagebits = 16, \
	.endianness = IIO_CPU, \
	}, \
	}

	static const int tcs3472_agains[] = { 1, 4, 16, 60 };

	static const struct iio_chan_spec tcs3472_channels[] = {
	TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
	TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
	TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
	TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
	IIO_CHAN_SOFT_TIMESTAMP(4),
	};

	static int tcs3472_req_data(struct tcs3472_data *data)
	{
	int tries = 50;
	int ret;

	while (tries--) {
	ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
	if (ret < 0)
	return ret;
	if (ret & TCS3472_STATUS_AVALID)
	break;
	msleep(20);
	}

	if (tries < 0) {
	dev_err(&data->client->dev, "data not ready\n");
	return -EIO;
	}

	return 0;
	}

	static int tcs3472_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct tcs3472_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	if (iio_buffer_enabled(indio_dev))
	return -EBUSY;

	mutex_lock(&data->lock);
	ret = tcs3472_req_data(data);
	if (ret < 0) {
	mutex_unlock(&data->lock);
	return ret;
	}
	ret = i2c_smbus_read_word_data(data->client, chan->address);
	mutex_unlock(&data->lock);
	if (ret < 0)
	return ret;
	*val = ret;
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBSCALE:
	*val = tcs3472_agains[data->control &
	TCS3472_CONTROL_AGAIN_MASK];
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
	*val = 0;
	val2 = (256 - data->atime) 2400;
	return IIO_VAL_INT_PLUS_MICRO;
	}
	return -EINVAL;
	}

	static int tcs3472_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct tcs3472_data *data = iio_priv(indio_dev);
	int i;

	switch (mask) {
	case IIO_CHAN_INFO_CALIBSCALE:
	if (val2 != 0)
	return -EINVAL;
	for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) {
	if (val == tcs3472_agains[i]) {
	data->control &= ~TCS3472_CONTROL_AGAIN_MASK;
	data->control \|= i;
	return i2c_smbus_write_byte_data(
	data->client, TCS3472_CONTROL,
	data->control);
	}
	}
	return -EINVAL;
	case IIO_CHAN_INFO_INT_TIME:
	if (val != 0)
	return -EINVAL;
	for (i = 0; i < 256; i++) {
	if (val2 == (256 - i) * 2400) {
	data->atime = i;
	return i2c_smbus_write_word_data(
	data->client, TCS3472_ATIME,
	data->atime);
	}

	}
	return -EINVAL;
	}
	return -EINVAL;
	}

	static irqreturn_t tcs3472_trigger_handler(int irq, void *p)
	{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct tcs3472_data *data = iio_priv(indio_dev);
	int i, j = 0;

	int ret = tcs3472_req_data(data);
	if (ret < 0)
	goto done;

	for_each_set_bit(i, indio_dev->active_scan_mask,
	indio_dev->masklength) {
	ret = i2c_smbus_read_word_data(data->client,
	TCS3472_CDATA + 2*i);
	if (ret < 0)
	goto done;

	data->buffer[j++] = ret;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
	iio_get_time_ns());

	done:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
	}

	static ssize_t tcs3472_show_int_time_available(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	size_t len = 0;
	int i;

	for (i = 1; i <= 256; i++)
	len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
	2400 * i);

	/* replace trailing space by newline */
	buf[len - 1] = '\n';

	return len;
	}

	static IIO_CONST_ATTR(calibscale_available, "1 4 16 60");
	static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available);

	static struct attribute *tcs3472_attributes[] = {
	&iio_const_attr_calibscale_available.dev_attr.attr,
	&iio_dev_attr_integration_time_available.dev_attr.attr,
	NULL
	};

	static const struct attribute_group tcs3472_attribute_group = {
	.attrs = tcs3472_attributes,
	};

	static const struct iio_info tcs3472_info = {
	.read_raw = tcs3472_read_raw,
	.write_raw = tcs3472_write_raw,
	.attrs = &tcs3472_attribute_group,
	.driver_module = THIS_MODULE,
	};

	static int tcs3472_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tcs3472_data *data;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (indio_dev == NULL)
	return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	mutex_init(&data->lock);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &tcs3472_info;
	indio_dev->name = TCS3472_DRV_NAME;
	indio_dev->channels = tcs3472_channels;
	indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);
	if (ret < 0)
	return ret;

	if (ret == 0x44)
	dev_info(&client->dev, "TCS34721/34725 found\n");
	else if (ret == 0x4d)
	dev_info(&client->dev, "TCS34723/34727 found\n");
	else
	return -ENODEV;

	ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);
	if (ret < 0)
	return ret;
	data->control = ret;

	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);
	if (ret < 0)
	return ret;
	data->atime = ret;

	ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);
	if (ret < 0)
	return ret;

	/* enable device */
	data->enable = ret \| TCS3472_ENABLE_PON \| TCS3472_ENABLE_AEN;
	ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
	data->enable);
	if (ret < 0)
	return ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	tcs3472_trigger_handler, NULL);
	if (ret < 0)
	return ret;

	ret = iio_device_register(indio_dev);
	if (ret < 0)
	goto buffer_cleanup;

	return 0;

	buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
	return ret;
	}

	static int tcs3472_powerdown(struct tcs3472_data *data)
	{
	return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
	data->enable & ~(TCS3472_ENABLE_AEN \| TCS3472_ENABLE_PON));
	}

	static int tcs3472_remove(struct i2c_client *client)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	tcs3472_powerdown(iio_priv(indio_dev));

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int tcs3472_suspend(struct device *dev)
	{
	struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
	to_i2c_client(dev)));
	return tcs3472_powerdown(data);
	}

	static int tcs3472_resume(struct device *dev)
	{
	struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
	to_i2c_client(dev)));
	return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
	data->enable \| (TCS3472_ENABLE_AEN \| TCS3472_ENABLE_PON));
	}
	#endif

	static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);

	static const struct i2c_device_id tcs3472_id[] = {
	{ "tcs3472", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tcs3472_id);

	static struct i2c_driver tcs3472_driver = {
	.driver = {
	.name = TCS3472_DRV_NAME,
	.pm = &tcs3472_pm_ops,
	.owner = THIS_MODULE,
	},
	.probe = tcs3472_probe,
	.remove = tcs3472_remove,
	.id_table = tcs3472_id,
	};
	module_i2c_driver(tcs3472_driver);

	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	MODULE_DESCRIPTION("TCS3472 color light sensors driver");
	MODULE_LICENSE("GPL");