drivers/iio/light/tcs3414.c - kernel/msm-4.9 - Gitiles

 /*
  * tcs3414.c - Support for TAOS TCS3414 digital color sensor
  *
  * Copyright (c) 2014 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.
  *
  * Digital color sensor with 16-bit channels for red, green, blue, clear);
  * 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
  * TCS3415, TCS3416, resp.)
  *
  * TODO: sync, interrupt support, thresholds, prescaler
  */

 #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 TCS3414_DRV_NAME "tcs3414"

 #define TCS3414_COMMAND BIT(7)
 #define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))

 #define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
 #define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
 #define TCS3414_ID (TCS3414_COMMAND | 0x04)
 #define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
 #define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
 #define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
 #define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
 #define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)

 #define TCS3414_CONTROL_ADC_VALID BIT(4)
 #define TCS3414_CONTROL_ADC_EN BIT(1)
 #define TCS3414_CONTROL_POWER BIT(0)

 #define TCS3414_INTEG_MASK GENMASK(1, 0)
 #define TCS3414_INTEG_12MS 0x0
 #define TCS3414_INTEG_100MS 0x1
 #define TCS3414_INTEG_400MS 0x2

 #define TCS3414_GAIN_MASK GENMASK(5, 4)
 #define TCS3414_GAIN_SHIFT 4

 struct tcs3414_data {
 	struct i2c_client *client;
 	struct mutex lock;
 	u8 control;
 	u8 gain;
 	u8 timing;
 	u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
 };

 #define TCS3414_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_SCALE) | \
 		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, \
 	}, \
 }

 /* scale factors: 1/gain */
 static const int tcs3414_scales[][2] = {
 	{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
 };

 /* integration time in ms */
 static const int tcs3414_times[] = { 12, 100, 400 };

 static const struct iio_chan_spec tcs3414_channels[] = {
 	TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
 	TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
 	TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
 	TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
 	IIO_CHAN_SOFT_TIMESTAMP(4),
 };

 static int tcs3414_req_data(struct tcs3414_data *data)
 {
 	int tries = 25;
 	int ret;

 	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control | TCS3414_CONTROL_ADC_EN);
 	if (ret < 0)
 		return ret;

 	while (tries--) {
 		ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
 		if (ret < 0)
 			return ret;
 		if (ret & TCS3414_CONTROL_ADC_VALID)
 			break;
 		msleep(20);
 	}

 	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control);
 	if (ret < 0)
 		return ret;

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

 	return 0;
 }

 static int tcs3414_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long mask)
 {
 	struct tcs3414_data *data = iio_priv(indio_dev);
 	int i, ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		if (iio_buffer_enabled(indio_dev))
 			return -EBUSY;
 		mutex_lock(&data->lock);
 		ret = tcs3414_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_SCALE:
 		i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
 		*val = tcs3414_scales[i][0];
 		*val2 = tcs3414_scales[i][1];
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_INT_TIME:
 		*val = 0;
 		*val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
 		return IIO_VAL_INT_PLUS_MICRO;
 	}
 	return -EINVAL;
 }

 static int tcs3414_write_raw(struct iio_dev *indio_dev,
 			       struct iio_chan_spec const *chan,
 			       int val, int val2, long mask)
 {
 	struct tcs3414_data *data = iio_priv(indio_dev);
 	int i;

 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
 		for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
 			if (val == tcs3414_scales[i][0] &&
 				val2 == tcs3414_scales[i][1]) {
 				data->gain &= ~TCS3414_GAIN_MASK;
 				data->gain |= i << TCS3414_GAIN_SHIFT;
 				return i2c_smbus_write_byte_data(
 					data->client, TCS3414_GAIN,
 					data->gain);
 			}
 		}
 		return -EINVAL;
 	case IIO_CHAN_INFO_INT_TIME:
 		if (val != 0)
 			return -EINVAL;
 		for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
 			if (val == tcs3414_times[i] * 1000) {
 				data->timing &= ~TCS3414_INTEG_MASK;
 				data->timing |= i;
 				return i2c_smbus_write_byte_data(
 					data->client, TCS3414_TIMING,
 					data->timing);
 			}
 		}
 		return -EINVAL;
 	default:
 		return -EINVAL;
 	}
 }

 static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct tcs3414_data *data = iio_priv(indio_dev);
 	int i, j = 0;

 	for_each_set_bit(i, indio_dev->active_scan_mask,
 		indio_dev->masklength) {
 		int ret = i2c_smbus_read_word_data(data->client,
 			TCS3414_DATA_GREEN + 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 IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");

 static struct attribute *tcs3414_attributes[] = {
 	&iio_const_attr_scale_available.dev_attr.attr,
 	&iio_const_attr_integration_time_available.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group tcs3414_attribute_group = {
 	.attrs = tcs3414_attributes,
 };

 static const struct iio_info tcs3414_info = {
 	.read_raw = tcs3414_read_raw,
 	.write_raw = tcs3414_write_raw,
 	.attrs = &tcs3414_attribute_group,
 	.driver_module = THIS_MODULE,
 };

 static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
 {
 	struct tcs3414_data *data = iio_priv(indio_dev);

 	data->control |= TCS3414_CONTROL_ADC_EN;
 	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control);
 }

 static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
 {
 	struct tcs3414_data *data = iio_priv(indio_dev);
 	int ret;

 	ret = iio_triggered_buffer_predisable(indio_dev);
 	if (ret < 0)
 		return ret;

 	data->control &= ~TCS3414_CONTROL_ADC_EN;
 	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control);
 }

 static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
 	.preenable = tcs3414_buffer_preenable,
 	.postenable = &iio_triggered_buffer_postenable,
 	.predisable = tcs3414_buffer_predisable,
 };

 static int tcs3414_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	struct tcs3414_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 = &tcs3414_info;
 	indio_dev->name = TCS3414_DRV_NAME;
 	indio_dev->channels = tcs3414_channels;
 	indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
 	if (ret < 0)
 		return ret;

 	switch (ret & 0xf0) {
 	case 0x00:
 		dev_info(&client->dev, "TCS3404 found\n");
 		break;
 	case 0x10:
 		dev_info(&client->dev, "TCS3413/14/15/16 found\n");
 		break;
 	default:
 		return -ENODEV;
 	}

 	data->control = TCS3414_CONTROL_POWER;
 	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control);
 	if (ret < 0)
 		return ret;

 	data->timing = TCS3414_INTEG_12MS; /* free running */
 	ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
 		data->timing);
 	if (ret < 0)
 		return ret;

 	ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
 	if (ret < 0)
 		return ret;
 	data->gain = ret;

 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
 		tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
 	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 tcs3414_powerdown(struct tcs3414_data *data)
 {
 	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control & ~(TCS3414_CONTROL_POWER |
 		TCS3414_CONTROL_ADC_EN));
 }

 static int tcs3414_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);
 	tcs3414_powerdown(iio_priv(indio_dev));

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int tcs3414_suspend(struct device *dev)
 {
 	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev)));
 	return tcs3414_powerdown(data);
 }

 static int tcs3414_resume(struct device *dev)
 {
 	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev)));
 	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
 		data->control);
 }
 #endif

 static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);

 static const struct i2c_device_id tcs3414_id[] = {
 	{ "tcs3414", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tcs3414_id);

 static struct i2c_driver tcs3414_driver = {
 	.driver = {
 		.name	= TCS3414_DRV_NAME,
 		.pm	= &tcs3414_pm_ops,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= tcs3414_probe,
 	.remove		= tcs3414_remove,
 	.id_table	= tcs3414_id,
 };
 module_i2c_driver(tcs3414_driver);

 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
 MODULE_LICENSE("GPL");
	/*
	* tcs3414.c - Support for TAOS TCS3414 digital color sensor
	*
	* Copyright (c) 2014 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.
	*
	* Digital color sensor with 16-bit channels for red, green, blue, clear);
	* 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
	* TCS3415, TCS3416, resp.)
	*
	* TODO: sync, interrupt support, thresholds, prescaler
	*/

	#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 TCS3414_DRV_NAME "tcs3414"

	#define TCS3414_COMMAND BIT(7)
	#define TCS3414_COMMAND_WORD (TCS3414_COMMAND \| BIT(5))

	#define TCS3414_CONTROL (TCS3414_COMMAND \| 0x00)
	#define TCS3414_TIMING (TCS3414_COMMAND \| 0x01)
	#define TCS3414_ID (TCS3414_COMMAND \| 0x04)
	#define TCS3414_GAIN (TCS3414_COMMAND \| 0x07)
	#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD \| 0x10)
	#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD \| 0x12)
	#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD \| 0x14)
	#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD \| 0x16)

	#define TCS3414_CONTROL_ADC_VALID BIT(4)
	#define TCS3414_CONTROL_ADC_EN BIT(1)
	#define TCS3414_CONTROL_POWER BIT(0)

	#define TCS3414_INTEG_MASK GENMASK(1, 0)
	#define TCS3414_INTEG_12MS 0x0
	#define TCS3414_INTEG_100MS 0x1
	#define TCS3414_INTEG_400MS 0x2

	#define TCS3414_GAIN_MASK GENMASK(5, 4)
	#define TCS3414_GAIN_SHIFT 4

	struct tcs3414_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 control;
	u8 gain;
	u8 timing;
	u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
	};

	#define TCS3414_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_SCALE) \| \
	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, \
	}, \
	}

	/* scale factors: 1/gain */
	static const int tcs3414_scales[][2] = {
	{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
	};

	/* integration time in ms */
	static const int tcs3414_times[] = { 12, 100, 400 };

	static const struct iio_chan_spec tcs3414_channels[] = {
	TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
	TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
	TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
	TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
	IIO_CHAN_SOFT_TIMESTAMP(4),
	};

	static int tcs3414_req_data(struct tcs3414_data *data)
	{
	int tries = 25;
	int ret;

	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control \| TCS3414_CONTROL_ADC_EN);
	if (ret < 0)
	return ret;

	while (tries--) {
	ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
	if (ret < 0)
	return ret;
	if (ret & TCS3414_CONTROL_ADC_VALID)
	break;
	msleep(20);
	}

	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control);
	if (ret < 0)
	return ret;

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

	return 0;
	}

	static int tcs3414_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i, ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	if (iio_buffer_enabled(indio_dev))
	return -EBUSY;
	mutex_lock(&data->lock);
	ret = tcs3414_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_SCALE:
	i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
	*val = tcs3414_scales[i][0];
	*val2 = tcs3414_scales[i][1];
	return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_INT_TIME:
	*val = 0;
	val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] 1000;
	return IIO_VAL_INT_PLUS_MICRO;
	}
	return -EINVAL;
	}

	static int tcs3414_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
	for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
	if (val == tcs3414_scales[i][0] &&
	val2 == tcs3414_scales[i][1]) {
	data->gain &= ~TCS3414_GAIN_MASK;
	data->gain \|= i << TCS3414_GAIN_SHIFT;
	return i2c_smbus_write_byte_data(
	data->client, TCS3414_GAIN,
	data->gain);
	}
	}
	return -EINVAL;
	case IIO_CHAN_INFO_INT_TIME:
	if (val != 0)
	return -EINVAL;
	for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
	if (val == tcs3414_times[i] * 1000) {
	data->timing &= ~TCS3414_INTEG_MASK;
	data->timing \|= i;
	return i2c_smbus_write_byte_data(
	data->client, TCS3414_TIMING,
	data->timing);
	}
	}
	return -EINVAL;
	default:
	return -EINVAL;
	}
	}

	static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
	{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct tcs3414_data *data = iio_priv(indio_dev);
	int i, j = 0;

	for_each_set_bit(i, indio_dev->active_scan_mask,
	indio_dev->masklength) {
	int ret = i2c_smbus_read_word_data(data->client,
	TCS3414_DATA_GREEN + 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 IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
	static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");

	static struct attribute *tcs3414_attributes[] = {
	&iio_const_attr_scale_available.dev_attr.attr,
	&iio_const_attr_integration_time_available.dev_attr.attr,
	NULL
	};

	static const struct attribute_group tcs3414_attribute_group = {
	.attrs = tcs3414_attributes,
	};

	static const struct iio_info tcs3414_info = {
	.read_raw = tcs3414_read_raw,
	.write_raw = tcs3414_write_raw,
	.attrs = &tcs3414_attribute_group,
	.driver_module = THIS_MODULE,
	};

	static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
	{
	struct tcs3414_data *data = iio_priv(indio_dev);

	data->control \|= TCS3414_CONTROL_ADC_EN;
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control);
	}

	static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
	{
	struct tcs3414_data *data = iio_priv(indio_dev);
	int ret;

	ret = iio_triggered_buffer_predisable(indio_dev);
	if (ret < 0)
	return ret;

	data->control &= ~TCS3414_CONTROL_ADC_EN;
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control);
	}

	static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
	.preenable = tcs3414_buffer_preenable,
	.postenable = &iio_triggered_buffer_postenable,
	.predisable = tcs3414_buffer_predisable,
	};

	static int tcs3414_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tcs3414_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 = &tcs3414_info;
	indio_dev->name = TCS3414_DRV_NAME;
	indio_dev->channels = tcs3414_channels;
	indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
	if (ret < 0)
	return ret;

	switch (ret & 0xf0) {
	case 0x00:
	dev_info(&client->dev, "TCS3404 found\n");
	break;
	case 0x10:
	dev_info(&client->dev, "TCS3413/14/15/16 found\n");
	break;
	default:
	return -ENODEV;
	}

	data->control = TCS3414_CONTROL_POWER;
	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control);
	if (ret < 0)
	return ret;

	data->timing = TCS3414_INTEG_12MS; /* free running */
	ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
	data->timing);
	if (ret < 0)
	return ret;

	ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
	if (ret < 0)
	return ret;
	data->gain = ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
	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 tcs3414_powerdown(struct tcs3414_data *data)
	{
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control & ~(TCS3414_CONTROL_POWER \|
	TCS3414_CONTROL_ADC_EN));
	}

	static int tcs3414_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);
	tcs3414_powerdown(iio_priv(indio_dev));

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int tcs3414_suspend(struct device *dev)
	{
	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
	to_i2c_client(dev)));
	return tcs3414_powerdown(data);
	}

	static int tcs3414_resume(struct device *dev)
	{
	struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
	to_i2c_client(dev)));
	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
	data->control);
	}
	#endif

	static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);

	static const struct i2c_device_id tcs3414_id[] = {
	{ "tcs3414", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tcs3414_id);

	static struct i2c_driver tcs3414_driver = {
	.driver = {
	.name = TCS3414_DRV_NAME,
	.pm = &tcs3414_pm_ops,
	.owner = THIS_MODULE,
	},
	.probe = tcs3414_probe,
	.remove = tcs3414_remove,
	.id_table = tcs3414_id,
	};
	module_i2c_driver(tcs3414_driver);

	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
	MODULE_LICENSE("GPL");