drivers/iio/light/cm32181.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2013 Capella Microsystems Inc.
  * Author: Kevin Tsai <ktsai@capellamicro.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2, as published
  * by the Free Software Foundation.
  */

 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/regulator/consumer.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
 #include <linux/init.h>

 /* Registers Address */
 #define CM32181_REG_ADDR_CMD		0x00
 #define CM32181_REG_ADDR_ALS		0x04
 #define CM32181_REG_ADDR_STATUS		0x06
 #define CM32181_REG_ADDR_ID		0x07

 /* Number of Configurable Registers */
 #define CM32181_CONF_REG_NUM		0x01

 /* CMD register */
 #define CM32181_CMD_ALS_ENABLE		0x00
 #define CM32181_CMD_ALS_DISABLE		0x01
 #define CM32181_CMD_ALS_INT_EN		0x02

 #define CM32181_CMD_ALS_IT_SHIFT	6
 #define CM32181_CMD_ALS_IT_MASK		(0x0F << CM32181_CMD_ALS_IT_SHIFT)
 #define CM32181_CMD_ALS_IT_DEFAULT	(0x00 << CM32181_CMD_ALS_IT_SHIFT)

 #define CM32181_CMD_ALS_SM_SHIFT	11
 #define CM32181_CMD_ALS_SM_MASK		(0x03 << CM32181_CMD_ALS_SM_SHIFT)
 #define CM32181_CMD_ALS_SM_DEFAULT	(0x01 << CM32181_CMD_ALS_SM_SHIFT)

 #define CM32181_MLUX_PER_BIT		5	/* ALS_SM=01 IT=800ms */
 #define CM32181_MLUX_PER_BIT_BASE_IT	800000	/* Based on IT=800ms */
 #define	CM32181_CALIBSCALE_DEFAULT	1000
 #define CM32181_CALIBSCALE_RESOLUTION	1000
 #define MLUX_PER_LUX			1000

 static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
 	CM32181_REG_ADDR_CMD,
 };

 static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
 static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
 	800000};

 struct cm32181_chip {
 	struct i2c_client *client;
 	struct mutex lock;
 	u16 conf_regs[CM32181_CONF_REG_NUM];
 	int calibscale;
 };

 /**
  * cm32181_reg_init() - Initialize CM32181 registers
  * @cm32181:	pointer of struct cm32181.
  *
  * Initialize CM32181 ambient light sensor register to default values.
  *
  * Return: 0 for success; otherwise for error code.
  */
 static int cm32181_reg_init(struct cm32181_chip *cm32181)
 {
 	struct i2c_client *client = cm32181->client;
 	int i;
 	s32 ret;

 	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
 	if (ret < 0)
 		return ret;

 	/* check device ID */
 	if ((ret & 0xFF) != 0x81)
 		return -ENODEV;

 	/* Default Values */
 	cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE |
 			CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
 	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;

 	/* Initialize registers*/
 	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
 		ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
 			cm32181->conf_regs[i]);
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }

 /**
  *  cm32181_read_als_it() - Get sensor integration time (ms)
  *  @cm32181:	pointer of struct cm32181
  *  @val:	pointer of int to load the als_it value.
  *
  *  Report the current integartion time by millisecond.
  *
  *  Return: IIO_VAL_INT for success, otherwise -EINVAL.
  */
 static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val)
 {
 	u16 als_it;
 	int i;

 	als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
 	als_it &= CM32181_CMD_ALS_IT_MASK;
 	als_it >>= CM32181_CMD_ALS_IT_SHIFT;
 	for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
 		if (als_it == als_it_bits[i]) {
 			*val = als_it_value[i];
 			return IIO_VAL_INT;
 		}
 	}

 	return -EINVAL;
 }

 /**
  * cm32181_write_als_it() - Write sensor integration time
  * @cm32181:	pointer of struct cm32181.
  * @val:	integration time by millisecond.
  *
  * Convert integration time (ms) to sensor value.
  *
  * Return: i2c_smbus_write_word_data command return value.
  */
 static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
 {
 	struct i2c_client *client = cm32181->client;
 	u16 als_it;
 	int ret, i, n;

 	n = ARRAY_SIZE(als_it_value);
 	for (i = 0; i < n; i++)
 		if (val <= als_it_value[i])
 			break;
 	if (i >= n)
 		i = n - 1;

 	als_it = als_it_bits[i];
 	als_it <<= CM32181_CMD_ALS_IT_SHIFT;

 	mutex_lock(&cm32181->lock);
 	cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
 		~CM32181_CMD_ALS_IT_MASK;
 	cm32181->conf_regs[CM32181_REG_ADDR_CMD] |=
 		als_it;
 	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
 			cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
 	mutex_unlock(&cm32181->lock);

 	return ret;
 }

 /**
  * cm32181_get_lux() - report current lux value
  * @cm32181:	pointer of struct cm32181.
  *
  * Convert sensor raw data to lux.  It depends on integration
  * time and claibscale variable.
  *
  * Return: Positive value is lux, otherwise is error code.
  */
 static int cm32181_get_lux(struct cm32181_chip *cm32181)
 {
 	struct i2c_client *client = cm32181->client;
 	int ret;
 	int als_it;
 	unsigned long lux;

 	ret = cm32181_read_als_it(cm32181, &als_it);
 	if (ret < 0)
 		return -EINVAL;

 	lux = CM32181_MLUX_PER_BIT;
 	lux *= CM32181_MLUX_PER_BIT_BASE_IT;
 	lux /= als_it;

 	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
 	if (ret < 0)
 		return ret;

 	lux *= ret;
 	lux *= cm32181->calibscale;
 	lux /= CM32181_CALIBSCALE_RESOLUTION;
 	lux /= MLUX_PER_LUX;

 	if (lux > 0xFFFF)
 		lux = 0xFFFF;

 	return lux;
 }

 static int cm32181_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int *val, int *val2, long mask)
 {
 	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_PROCESSED:
 		ret = cm32181_get_lux(cm32181);
 		if (ret < 0)
 			return ret;
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBSCALE:
 		*val = cm32181->calibscale;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_INT_TIME:
 		ret = cm32181_read_als_it(cm32181, val);
 		return ret;
 	}

 	return -EINVAL;
 }

 static int cm32181_write_raw(struct iio_dev *indio_dev,
 			     struct iio_chan_spec const *chan,
 			     int val, int val2, long mask)
 {
 	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
 	int ret;

 	switch (mask) {
 	case IIO_CHAN_INFO_CALIBSCALE:
 		cm32181->calibscale = val;
 		return val;
 	case IIO_CHAN_INFO_INT_TIME:
 		ret = cm32181_write_als_it(cm32181, val);
 		return ret;
 	}

 	return -EINVAL;
 }

 /**
  * cm32181_get_it_available() - Get available ALS IT value
  * @dev:	pointer of struct device.
  * @attr:	pointer of struct device_attribute.
  * @buf:	pointer of return string buffer.
  *
  * Display the available integration time values by millisecond.
  *
  * Return: string length.
  */
 static ssize_t cm32181_get_it_available(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	int i, n, len;

 	n = ARRAY_SIZE(als_it_value);
 	for (i = 0, len = 0; i < n; i++)
 		len += sprintf(buf + len, "%d ", als_it_value[i]);
 	return len + sprintf(buf + len, "\n");
 }

 static const struct iio_chan_spec cm32181_channels[] = {
 	{
 		.type = IIO_LIGHT,
 		.info_mask_separate =
 			BIT(IIO_CHAN_INFO_PROCESSED) |
 			BIT(IIO_CHAN_INFO_CALIBSCALE) |
 			BIT(IIO_CHAN_INFO_INT_TIME),
 	}
 };

 static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
 			S_IRUGO, cm32181_get_it_available, NULL, 0);

 static struct attribute *cm32181_attributes[] = {
 	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
 	NULL,
 };

 static const struct attribute_group cm32181_attribute_group = {
 	.attrs = cm32181_attributes
 };

 static const struct iio_info cm32181_info = {
 	.driver_module		= THIS_MODULE,
 	.read_raw		= &cm32181_read_raw,
 	.write_raw		= &cm32181_write_raw,
 	.attrs			= &cm32181_attribute_group,
 };

 static int cm32181_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct cm32181_chip *cm32181;
 	struct iio_dev *indio_dev;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
 	if (!indio_dev) {
 		dev_err(&client->dev, "devm_iio_device_alloc failed\n");
 		return -ENOMEM;
 	}

 	cm32181 = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	cm32181->client = client;

 	mutex_init(&cm32181->lock);
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->channels = cm32181_channels;
 	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
 	indio_dev->info = &cm32181_info;
 	indio_dev->name = id->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = cm32181_reg_init(cm32181);
 	if (ret) {
 		dev_err(&client->dev,
 			"%s: register init failed\n",
 			__func__);
 		return ret;
 	}

 	ret = iio_device_register(indio_dev);
 	if (ret) {
 		dev_err(&client->dev,
 			"%s: regist device failed\n",
 			__func__);
 		return ret;
 	}

 	return 0;
 }

 static int cm32181_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);

 	iio_device_unregister(indio_dev);
 	return 0;
 }

 static const struct i2c_device_id cm32181_id[] = {
 	{ "cm32181", 0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, cm32181_id);

 static const struct of_device_id cm32181_of_match[] = {
 	{ .compatible = "capella,cm32181" },
 	{ }
 };

 static struct i2c_driver cm32181_driver = {
 	.driver = {
 		.name	= "cm32181",
 		.of_match_table = of_match_ptr(cm32181_of_match),
 		.owner	= THIS_MODULE,
 	},
 	.id_table       = cm32181_id,
 	.probe		= cm32181_probe,
 	.remove		= cm32181_remove,
 };

 module_i2c_driver(cm32181_driver);

 MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
 MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2013 Capella Microsystems Inc.
	* Author: Kevin Tsai <ktsai@capellamicro.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2, as published
	* by the Free Software Foundation.
	*/

	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/mutex.h>
	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/regulator/consumer.h>
	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/iio/events.h>
	#include <linux/init.h>

	/* Registers Address */
	#define CM32181_REG_ADDR_CMD 0x00
	#define CM32181_REG_ADDR_ALS 0x04
	#define CM32181_REG_ADDR_STATUS 0x06
	#define CM32181_REG_ADDR_ID 0x07

	/* Number of Configurable Registers */
	#define CM32181_CONF_REG_NUM 0x01

	/* CMD register */
	#define CM32181_CMD_ALS_ENABLE 0x00
	#define CM32181_CMD_ALS_DISABLE 0x01
	#define CM32181_CMD_ALS_INT_EN 0x02

	#define CM32181_CMD_ALS_IT_SHIFT 6
	#define CM32181_CMD_ALS_IT_MASK (0x0F << CM32181_CMD_ALS_IT_SHIFT)
	#define CM32181_CMD_ALS_IT_DEFAULT (0x00 << CM32181_CMD_ALS_IT_SHIFT)

	#define CM32181_CMD_ALS_SM_SHIFT 11
	#define CM32181_CMD_ALS_SM_MASK (0x03 << CM32181_CMD_ALS_SM_SHIFT)
	#define CM32181_CMD_ALS_SM_DEFAULT (0x01 << CM32181_CMD_ALS_SM_SHIFT)

	#define CM32181_MLUX_PER_BIT 5 /* ALS_SM=01 IT=800ms */
	#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
	#define CM32181_CALIBSCALE_DEFAULT 1000
	#define CM32181_CALIBSCALE_RESOLUTION 1000
	#define MLUX_PER_LUX 1000

	static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
	CM32181_REG_ADDR_CMD,
	};

	static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
	static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
	800000};

	struct cm32181_chip {
	struct i2c_client *client;
	struct mutex lock;
	u16 conf_regs[CM32181_CONF_REG_NUM];
	int calibscale;
	};

	/**
	* cm32181_reg_init() - Initialize CM32181 registers
	* @cm32181: pointer of struct cm32181.
	*
	* Initialize CM32181 ambient light sensor register to default values.
	*
	* Return: 0 for success; otherwise for error code.
	*/
	static int cm32181_reg_init(struct cm32181_chip *cm32181)
	{
	struct i2c_client *client = cm32181->client;
	int i;
	s32 ret;

	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
	if (ret < 0)
	return ret;

	/* check device ID */
	if ((ret & 0xFF) != 0x81)
	return -ENODEV;

	/* Default Values */
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE \|
	CM32181_CMD_ALS_IT_DEFAULT \| CM32181_CMD_ALS_SM_DEFAULT;
	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;

	/* Initialize registers*/
	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
	ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
	cm32181->conf_regs[i]);
	if (ret < 0)
	return ret;
	}

	return 0;
	}

	/**
	* cm32181_read_als_it() - Get sensor integration time (ms)
	* @cm32181: pointer of struct cm32181
	* @val: pointer of int to load the als_it value.
	*
	* Report the current integartion time by millisecond.
	*
	* Return: IIO_VAL_INT for success, otherwise -EINVAL.
	*/
	static int cm32181_read_als_it(struct cm32181_chip cm32181, int val)
	{
	u16 als_it;
	int i;

	als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
	als_it &= CM32181_CMD_ALS_IT_MASK;
	als_it >>= CM32181_CMD_ALS_IT_SHIFT;
	for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
	if (als_it == als_it_bits[i]) {
	*val = als_it_value[i];
	return IIO_VAL_INT;
	}
	}

	return -EINVAL;
	}

	/**
	* cm32181_write_als_it() - Write sensor integration time
	* @cm32181: pointer of struct cm32181.
	* @val: integration time by millisecond.
	*
	* Convert integration time (ms) to sensor value.
	*
	* Return: i2c_smbus_write_word_data command return value.
	*/
	static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
	{
	struct i2c_client *client = cm32181->client;
	u16 als_it;
	int ret, i, n;

	n = ARRAY_SIZE(als_it_value);
	for (i = 0; i < n; i++)
	if (val <= als_it_value[i])
	break;
	if (i >= n)
	i = n - 1;

	als_it = als_it_bits[i];
	als_it <<= CM32181_CMD_ALS_IT_SHIFT;

	mutex_lock(&cm32181->lock);
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
	~CM32181_CMD_ALS_IT_MASK;
	cm32181->conf_regs[CM32181_REG_ADDR_CMD] \|=
	als_it;
	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
	cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
	mutex_unlock(&cm32181->lock);

	return ret;
	}

	/**
	* cm32181_get_lux() - report current lux value
	* @cm32181: pointer of struct cm32181.
	*
	* Convert sensor raw data to lux. It depends on integration
	* time and claibscale variable.
	*
	* Return: Positive value is lux, otherwise is error code.
	*/
	static int cm32181_get_lux(struct cm32181_chip *cm32181)
	{
	struct i2c_client *client = cm32181->client;
	int ret;
	int als_it;
	unsigned long lux;

	ret = cm32181_read_als_it(cm32181, &als_it);
	if (ret < 0)
	return -EINVAL;

	lux = CM32181_MLUX_PER_BIT;
	lux *= CM32181_MLUX_PER_BIT_BASE_IT;
	lux /= als_it;

	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
	if (ret < 0)
	return ret;

	lux *= ret;
	lux *= cm32181->calibscale;
	lux /= CM32181_CALIBSCALE_RESOLUTION;
	lux /= MLUX_PER_LUX;

	if (lux > 0xFFFF)
	lux = 0xFFFF;

	return lux;
	}

	static int cm32181_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
	ret = cm32181_get_lux(cm32181);
	if (ret < 0)
	return ret;
	*val = ret;
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBSCALE:
	*val = cm32181->calibscale;
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
	ret = cm32181_read_als_it(cm32181, val);
	return ret;
	}

	return -EINVAL;
	}

	static int cm32181_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct cm32181_chip *cm32181 = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_CALIBSCALE:
	cm32181->calibscale = val;
	return val;
	case IIO_CHAN_INFO_INT_TIME:
	ret = cm32181_write_als_it(cm32181, val);
	return ret;
	}

	return -EINVAL;
	}

	/**
	* cm32181_get_it_available() - Get available ALS IT value
	* @dev: pointer of struct device.
	* @attr: pointer of struct device_attribute.
	* @buf: pointer of return string buffer.
	*
	* Display the available integration time values by millisecond.
	*
	* Return: string length.
	*/
	static ssize_t cm32181_get_it_available(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int i, n, len;

	n = ARRAY_SIZE(als_it_value);
	for (i = 0, len = 0; i < n; i++)
	len += sprintf(buf + len, "%d ", als_it_value[i]);
	return len + sprintf(buf + len, "\n");
	}

	static const struct iio_chan_spec cm32181_channels[] = {
	{
	.type = IIO_LIGHT,
	.info_mask_separate =
	BIT(IIO_CHAN_INFO_PROCESSED) \|
	BIT(IIO_CHAN_INFO_CALIBSCALE) \|
	BIT(IIO_CHAN_INFO_INT_TIME),
	}
	};

	static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
	S_IRUGO, cm32181_get_it_available, NULL, 0);

	static struct attribute *cm32181_attributes[] = {
	&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
	NULL,
	};

	static const struct attribute_group cm32181_attribute_group = {
	.attrs = cm32181_attributes
	};

	static const struct iio_info cm32181_info = {
	.driver_module = THIS_MODULE,
	.read_raw = &cm32181_read_raw,
	.write_raw = &cm32181_write_raw,
	.attrs = &cm32181_attribute_group,
	};

	static int cm32181_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct cm32181_chip *cm32181;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
	if (!indio_dev) {
	dev_err(&client->dev, "devm_iio_device_alloc failed\n");
	return -ENOMEM;
	}

	cm32181 = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	cm32181->client = client;

	mutex_init(&cm32181->lock);
	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = cm32181_channels;
	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
	indio_dev->info = &cm32181_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = cm32181_reg_init(cm32181);
	if (ret) {
	dev_err(&client->dev,
	"%s: register init failed\n",
	__func__);
	return ret;
	}

	ret = iio_device_register(indio_dev);
	if (ret) {
	dev_err(&client->dev,
	"%s: regist device failed\n",
	__func__);
	return ret;
	}

	return 0;
	}

	static int cm32181_remove(struct i2c_client *client)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	return 0;
	}

	static const struct i2c_device_id cm32181_id[] = {
	{ "cm32181", 0 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, cm32181_id);

	static const struct of_device_id cm32181_of_match[] = {
	{ .compatible = "capella,cm32181" },
	{ }
	};

	static struct i2c_driver cm32181_driver = {
	.driver = {
	.name = "cm32181",
	.of_match_table = of_match_ptr(cm32181_of_match),
	.owner = THIS_MODULE,
	},
	.id_table = cm32181_id,
	.probe = cm32181_probe,
	.remove = cm32181_remove,
	};

	module_i2c_driver(cm32181_driver);

	MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
	MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
	MODULE_LICENSE("GPL");