drivers/iio/light/adjd_s311.c - kernel/msm-4.19 - Gitiles

 /*
  * adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
  *
  * Copyright (C) 2012 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.
  *
  * driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
  * red, green, blue, clear); 7-bit I2C slave address 0x74
  *
  * limitations: no calibration, no offset mode, no sleep mode
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/bitmap.h>
 #include <linux/err.h>
 #include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"

 #define ADJD_S311_CTRL		0x00
 #define ADJD_S311_CONFIG	0x01
 #define ADJD_S311_CAP_RED	0x06
 #define ADJD_S311_CAP_GREEN	0x07
 #define ADJD_S311_CAP_BLUE	0x08
 #define ADJD_S311_CAP_CLEAR	0x09
 #define ADJD_S311_INT_RED_LO	0x0a
 #define ADJD_S311_INT_RED_HI	0x0b
 #define ADJD_S311_INT_GREEN_LO	0x0c
 #define ADJD_S311_INT_GREEN_HI	0x0d
 #define ADJD_S311_INT_BLUE_LO	0x0e
 #define ADJD_S311_INT_BLUE_HI	0x0f
 #define ADJD_S311_INT_CLEAR_LO	0x10
 #define ADJD_S311_INT_CLEAR_HI	0x11
 #define ADJD_S311_DATA_RED_LO	0x40
 #define ADJD_S311_DATA_RED_HI	0x41
 #define ADJD_S311_DATA_GREEN_LO	0x42
 #define ADJD_S311_DATA_GREEN_HI	0x43
 #define ADJD_S311_DATA_BLUE_LO	0x44
 #define ADJD_S311_DATA_BLUE_HI	0x45
 #define ADJD_S311_DATA_CLEAR_LO	0x46
 #define ADJD_S311_DATA_CLEAR_HI	0x47
 #define ADJD_S311_OFFSET_RED	0x48
 #define ADJD_S311_OFFSET_GREEN	0x49
 #define ADJD_S311_OFFSET_BLUE	0x4a
 #define ADJD_S311_OFFSET_CLEAR	0x4b

 #define ADJD_S311_CTRL_GOFS	0x02
 #define ADJD_S311_CTRL_GSSR	0x01
 #define ADJD_S311_CAP_MASK	0x0f
 #define ADJD_S311_INT_MASK	0x0fff
 #define ADJD_S311_DATA_MASK	0x03ff

 struct adjd_s311_data {
 	struct i2c_client *client;
 	u16 *buffer;
 };

 enum adjd_s311_channel_idx {
 	IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
 };

 #define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED_LO + (chan) * 2)
 #define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED_LO + (chan) * 2)
 #define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))

 static int adjd_s311_req_data(struct iio_dev *indio_dev)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	int tries = 10;

 	int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
 		ADJD_S311_CTRL_GSSR);
 	if (ret < 0)
 		return ret;

 	while (tries--) {
 		ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
 		if (ret < 0)
 			return ret;
 		if (!(ret & ADJD_S311_CTRL_GSSR))
 			break;
 		msleep(20);
 	}

 	if (tries < 0) {
 		dev_err(&data->client->dev,
 			"adjd_s311_req_data() failed, data not ready\n");
 		return -EIO;
 	}

 	return 0;
 }

 static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);

 	int ret = adjd_s311_req_data(indio_dev);
 	if (ret < 0)
 		return ret;

 	ret = i2c_smbus_read_word_data(data->client, reg);
 	if (ret < 0)
 		return ret;

 	*val = ret & ADJD_S311_DATA_MASK;

 	return 0;
 }

 static ssize_t adjd_s311_read_int_time(struct iio_dev *indio_dev,
 	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	s32 ret;

 	ret = i2c_smbus_read_word_data(data->client,
 		ADJD_S311_INT_REG(chan->address));
 	if (ret < 0)
 		return ret;

 	return sprintf(buf, "%d\n", ret & ADJD_S311_INT_MASK);
 }

 static ssize_t adjd_s311_write_int_time(struct iio_dev *indio_dev,
 	 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
 	 size_t len)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	unsigned long int_time;
 	int ret;

 	ret = kstrtoul(buf, 10, &int_time);
 	if (ret)
 		return ret;

 	if (int_time > ADJD_S311_INT_MASK)
 		return -EINVAL;

 	ret = i2c_smbus_write_word_data(data->client,
 		ADJD_S311_INT_REG(chan->address), int_time);
 	if (ret < 0)
 		return ret;

 	return len;
 }

 static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	s64 time_ns = iio_get_time_ns();
 	int len = 0;
 	int i, j = 0;

 	int ret = adjd_s311_req_data(indio_dev);
 	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,
 			ADJD_S311_DATA_REG(i));
 		if (ret < 0)
 			goto done;

 		data->buffer[j++] = ret & ADJD_S311_DATA_MASK;
 		len += 2;
 	}

 	if (indio_dev->scan_timestamp)
 		*(s64 *)((u8 *)data->buffer + ALIGN(len, sizeof(s64)))
 			= time_ns;
 	iio_push_to_buffers(indio_dev, (u8 *)data->buffer);

 done:
 	iio_trigger_notify_done(indio_dev->trig);

 	return IRQ_HANDLED;
 }

 static const struct iio_chan_spec_ext_info adjd_s311_ext_info[] = {
 	{
 		.name = "integration_time",
 		.read = adjd_s311_read_int_time,
 		.write = adjd_s311_write_int_time,
 	},
 	{ }
 };

 #define ADJD_S311_CHANNEL(_color, _scan_idx) { \
 	.type = IIO_INTENSITY, \
 	.modified = 1, \
 	.address = (IDX_##_color), \
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 		BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
 	.channel2 = (IIO_MOD_LIGHT_##_color), \
 	.scan_index = (_scan_idx), \
 	.scan_type = IIO_ST('u', 10, 16, 0), \
 	.ext_info = adjd_s311_ext_info, \
 }

 static const struct iio_chan_spec adjd_s311_channels[] = {
 	ADJD_S311_CHANNEL(RED, 0),
 	ADJD_S311_CHANNEL(GREEN, 1),
 	ADJD_S311_CHANNEL(BLUE, 2),
 	ADJD_S311_CHANNEL(CLEAR, 3),
 	IIO_CHAN_SOFT_TIMESTAMP(4),
 };

 static int adjd_s311_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long mask)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		ret = adjd_s311_read_data(indio_dev,
 			ADJD_S311_DATA_REG(chan->address), val);
 		if (ret < 0)
 			return ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_HARDWAREGAIN:
 		ret = i2c_smbus_read_byte_data(data->client,
 			ADJD_S311_CAP_REG(chan->address));
 		if (ret < 0)
 			return ret;
 		*val = ret & ADJD_S311_CAP_MASK;
 		return IIO_VAL_INT;
 	}
 	return -EINVAL;
 }

 static int adjd_s311_write_raw(struct iio_dev *indio_dev,
 			       struct iio_chan_spec const *chan,
 			       int val, int val2, long mask)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_HARDWAREGAIN:
 		if (val < 0 || val > ADJD_S311_CAP_MASK)
 			return -EINVAL;

 		ret = i2c_smbus_write_byte_data(data->client,
 			ADJD_S311_CAP_REG(chan->address), val);
 		return ret;
 	}
 	return -EINVAL;
 }

 static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
 	const unsigned long *scan_mask)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);

 	kfree(data->buffer);
 	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 	if (data->buffer == NULL)
 		return -ENOMEM;

 	return 0;
 }

 static const struct iio_info adjd_s311_info = {
 	.read_raw = adjd_s311_read_raw,
 	.write_raw = adjd_s311_write_raw,
 	.update_scan_mode = adjd_s311_update_scan_mode,
 	.driver_module = THIS_MODULE,
 };

 static int adjd_s311_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	struct adjd_s311_data *data;
 	struct iio_dev *indio_dev;
 	int err;

 	indio_dev = iio_device_alloc(sizeof(*data));
 	if (indio_dev == NULL) {
 		err = -ENOMEM;
 		goto exit;
 	}
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;

 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &adjd_s311_info;
 	indio_dev->name = ADJD_S311_DRV_NAME;
 	indio_dev->channels = adjd_s311_channels;
 	indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	err = iio_triggered_buffer_setup(indio_dev, NULL,
 		adjd_s311_trigger_handler, NULL);
 	if (err < 0)
 		goto exit_free_device;

 	err = iio_device_register(indio_dev);
 	if (err)
 		goto exit_unreg_buffer;

 	dev_info(&client->dev, "ADJD-S311 color sensor registered\n");

 	return 0;

 exit_unreg_buffer:
 	iio_triggered_buffer_cleanup(indio_dev);
 exit_free_device:
 	iio_device_free(indio_dev);
 exit:
 	return err;
 }

 static int adjd_s311_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct adjd_s311_data *data = iio_priv(indio_dev);

 	iio_device_unregister(indio_dev);
 	iio_triggered_buffer_cleanup(indio_dev);
 	kfree(data->buffer);
 	iio_device_free(indio_dev);

 	return 0;
 }

 static const struct i2c_device_id adjd_s311_id[] = {
 	{ "adjd_s311", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adjd_s311_id);

 static struct i2c_driver adjd_s311_driver = {
 	.driver = {
 		.name	= ADJD_S311_DRV_NAME,
 	},
 	.probe		= adjd_s311_probe,
 	.remove		= adjd_s311_remove,
 	.id_table	= adjd_s311_id,
 };
 module_i2c_driver(adjd_s311_driver);

 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 MODULE_DESCRIPTION("ADJD-S311 color sensor");
 MODULE_LICENSE("GPL");
	/*
	* adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
	*
	* Copyright (C) 2012 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.
	*
	* driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
	* red, green, blue, clear); 7-bit I2C slave address 0x74
	*
	* limitations: no calibration, no offset mode, no sleep mode
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/bitmap.h>
	#include <linux/err.h>
	#include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"

	#define ADJD_S311_CTRL 0x00
	#define ADJD_S311_CONFIG 0x01
	#define ADJD_S311_CAP_RED 0x06
	#define ADJD_S311_CAP_GREEN 0x07
	#define ADJD_S311_CAP_BLUE 0x08
	#define ADJD_S311_CAP_CLEAR 0x09
	#define ADJD_S311_INT_RED_LO 0x0a
	#define ADJD_S311_INT_RED_HI 0x0b
	#define ADJD_S311_INT_GREEN_LO 0x0c
	#define ADJD_S311_INT_GREEN_HI 0x0d
	#define ADJD_S311_INT_BLUE_LO 0x0e
	#define ADJD_S311_INT_BLUE_HI 0x0f
	#define ADJD_S311_INT_CLEAR_LO 0x10
	#define ADJD_S311_INT_CLEAR_HI 0x11
	#define ADJD_S311_DATA_RED_LO 0x40
	#define ADJD_S311_DATA_RED_HI 0x41
	#define ADJD_S311_DATA_GREEN_LO 0x42
	#define ADJD_S311_DATA_GREEN_HI 0x43
	#define ADJD_S311_DATA_BLUE_LO 0x44
	#define ADJD_S311_DATA_BLUE_HI 0x45
	#define ADJD_S311_DATA_CLEAR_LO 0x46
	#define ADJD_S311_DATA_CLEAR_HI 0x47
	#define ADJD_S311_OFFSET_RED 0x48
	#define ADJD_S311_OFFSET_GREEN 0x49
	#define ADJD_S311_OFFSET_BLUE 0x4a
	#define ADJD_S311_OFFSET_CLEAR 0x4b

	#define ADJD_S311_CTRL_GOFS 0x02
	#define ADJD_S311_CTRL_GSSR 0x01
	#define ADJD_S311_CAP_MASK 0x0f
	#define ADJD_S311_INT_MASK 0x0fff
	#define ADJD_S311_DATA_MASK 0x03ff

	struct adjd_s311_data {
	struct i2c_client *client;
	u16 *buffer;
	};

	enum adjd_s311_channel_idx {
	IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
	};

	#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED_LO + (chan) * 2)
	#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED_LO + (chan) * 2)
	#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))

	static int adjd_s311_req_data(struct iio_dev *indio_dev)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	int tries = 10;

	int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
	ADJD_S311_CTRL_GSSR);
	if (ret < 0)
	return ret;

	while (tries--) {
	ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
	if (ret < 0)
	return ret;
	if (!(ret & ADJD_S311_CTRL_GSSR))
	break;
	msleep(20);
	}

	if (tries < 0) {
	dev_err(&data->client->dev,
	"adjd_s311_req_data() failed, data not ready\n");
	return -EIO;
	}

	return 0;
	}

	static int adjd_s311_read_data(struct iio_dev indio_dev, u8 reg, int val)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);

	int ret = adjd_s311_req_data(indio_dev);
	if (ret < 0)
	return ret;

	ret = i2c_smbus_read_word_data(data->client, reg);
	if (ret < 0)
	return ret;

	*val = ret & ADJD_S311_DATA_MASK;

	return 0;
	}

	static ssize_t adjd_s311_read_int_time(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec chan, char buf)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	s32 ret;

	ret = i2c_smbus_read_word_data(data->client,
	ADJD_S311_INT_REG(chan->address));
	if (ret < 0)
	return ret;

	return sprintf(buf, "%d\n", ret & ADJD_S311_INT_MASK);
	}

	static ssize_t adjd_s311_write_int_time(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec chan, const char buf,
	size_t len)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	unsigned long int_time;
	int ret;

	ret = kstrtoul(buf, 10, &int_time);
	if (ret)
	return ret;

	if (int_time > ADJD_S311_INT_MASK)
	return -EINVAL;

	ret = i2c_smbus_write_word_data(data->client,
	ADJD_S311_INT_REG(chan->address), int_time);
	if (ret < 0)
	return ret;

	return len;
	}

	static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
	{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adjd_s311_data *data = iio_priv(indio_dev);
	s64 time_ns = iio_get_time_ns();
	int len = 0;
	int i, j = 0;

	int ret = adjd_s311_req_data(indio_dev);
	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,
	ADJD_S311_DATA_REG(i));
	if (ret < 0)
	goto done;

	data->buffer[j++] = ret & ADJD_S311_DATA_MASK;
	len += 2;
	}

	if (indio_dev->scan_timestamp)
	(s64 )((u8 *)data->buffer + ALIGN(len, sizeof(s64)))
	= time_ns;
	iio_push_to_buffers(indio_dev, (u8 *)data->buffer);

	done:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
	}

	static const struct iio_chan_spec_ext_info adjd_s311_ext_info[] = {
	{
	.name = "integration_time",
	.read = adjd_s311_read_int_time,
	.write = adjd_s311_write_int_time,
	},
	{ }
	};

	#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
	.type = IIO_INTENSITY, \
	.modified = 1, \
	.address = (IDX_##_color), \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \| \
	BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
	.channel2 = (IIO_MOD_LIGHT_##_color), \
	.scan_index = (_scan_idx), \
	.scan_type = IIO_ST('u', 10, 16, 0), \
	.ext_info = adjd_s311_ext_info, \
	}

	static const struct iio_chan_spec adjd_s311_channels[] = {
	ADJD_S311_CHANNEL(RED, 0),
	ADJD_S311_CHANNEL(GREEN, 1),
	ADJD_S311_CHANNEL(BLUE, 2),
	ADJD_S311_CHANNEL(CLEAR, 3),
	IIO_CHAN_SOFT_TIMESTAMP(4),
	};

	static int adjd_s311_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	ret = adjd_s311_read_data(indio_dev,
	ADJD_S311_DATA_REG(chan->address), val);
	if (ret < 0)
	return ret;
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_HARDWAREGAIN:
	ret = i2c_smbus_read_byte_data(data->client,
	ADJD_S311_CAP_REG(chan->address));
	if (ret < 0)
	return ret;
	*val = ret & ADJD_S311_CAP_MASK;
	return IIO_VAL_INT;
	}
	return -EINVAL;
	}

	static int adjd_s311_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_HARDWAREGAIN:
	if (val < 0 \|\| val > ADJD_S311_CAP_MASK)
	return -EINVAL;

	ret = i2c_smbus_write_byte_data(data->client,
	ADJD_S311_CAP_REG(chan->address), val);
	return ret;
	}
	return -EINVAL;
	}

	static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
	const unsigned long *scan_mask)
	{
	struct adjd_s311_data *data = iio_priv(indio_dev);

	kfree(data->buffer);
	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
	if (data->buffer == NULL)
	return -ENOMEM;

	return 0;
	}

	static const struct iio_info adjd_s311_info = {
	.read_raw = adjd_s311_read_raw,
	.write_raw = adjd_s311_write_raw,
	.update_scan_mode = adjd_s311_update_scan_mode,
	.driver_module = THIS_MODULE,
	};

	static int adjd_s311_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct adjd_s311_data *data;
	struct iio_dev *indio_dev;
	int err;

	indio_dev = iio_device_alloc(sizeof(*data));
	if (indio_dev == NULL) {
	err = -ENOMEM;
	goto exit;
	}
	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &adjd_s311_info;
	indio_dev->name = ADJD_S311_DRV_NAME;
	indio_dev->channels = adjd_s311_channels;
	indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	err = iio_triggered_buffer_setup(indio_dev, NULL,
	adjd_s311_trigger_handler, NULL);
	if (err < 0)
	goto exit_free_device;

	err = iio_device_register(indio_dev);
	if (err)
	goto exit_unreg_buffer;

	dev_info(&client->dev, "ADJD-S311 color sensor registered\n");

	return 0;

	exit_unreg_buffer:
	iio_triggered_buffer_cleanup(indio_dev);
	exit_free_device:
	iio_device_free(indio_dev);
	exit:
	return err;
	}

	static int adjd_s311_remove(struct i2c_client *client)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct adjd_s311_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	kfree(data->buffer);
	iio_device_free(indio_dev);

	return 0;
	}

	static const struct i2c_device_id adjd_s311_id[] = {
	{ "adjd_s311", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adjd_s311_id);

	static struct i2c_driver adjd_s311_driver = {
	.driver = {
	.name = ADJD_S311_DRV_NAME,
	},
	.probe = adjd_s311_probe,
	.remove = adjd_s311_remove,
	.id_table = adjd_s311_id,
	};
	module_i2c_driver(adjd_s311_driver);

	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	MODULE_DESCRIPTION("ADJD-S311 color sensor");
	MODULE_LICENSE("GPL");