Orange Pi5 kernel

 // SPDX-License-Identifier: GPL-2.0-only
/*
 * CM3232 Ambient Light Sensor
 *
 * Copyright (C) 2014-2015 Capella Microsystems Inc.
 * Author: Kevin Tsai <ktsai@capellamicro.com>
 *
 * IIO driver for CM3232 (7-bit I2C slave address 0x10).
 */
 
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/init.h>
 
/* Registers Address */
#define CM3232_REG_ADDR_CMD		0x00
#define CM3232_REG_ADDR_ALS		0x50
#define CM3232_REG_ADDR_ID		0x53
 
#define CM3232_CMD_ALS_DISABLE		BIT(0)
 
#define CM3232_CMD_ALS_IT_SHIFT		2
#define CM3232_CMD_ALS_IT_MASK		(BIT(2) | BIT(3) | BIT(4))
#define CM3232_CMD_ALS_IT_DEFAULT	(0x01 << CM3232_CMD_ALS_IT_SHIFT)
 
#define CM3232_CMD_ALS_RESET		BIT(6)
 
#define CM3232_CMD_DEFAULT		CM3232_CMD_ALS_IT_DEFAULT
 
#define CM3232_HW_ID			0x32
#define CM3232_CALIBSCALE_DEFAULT	100000
#define CM3232_CALIBSCALE_RESOLUTION	100000
#define CM3232_MLUX_PER_LUX		1000
 
#define CM3232_MLUX_PER_BIT_DEFAULT	64
#define CM3232_MLUX_PER_BIT_BASE_IT	100000
 
static const struct {
<------>int val;
<------>int val2;
<------>u8 it;
} cm3232_als_it_scales[] = {
<------>{0, 100000, 0},	/* 0.100000 */
<------>{0, 200000, 1},	/* 0.200000 */
<------>{0, 400000, 2},	/* 0.400000 */
<------>{0, 800000, 3},	/* 0.800000 */
<------>{1, 600000, 4},	/* 1.600000 */
<------>{3, 200000, 5},	/* 3.200000 */
};
 
struct cm3232_als_info {
<------>u8 regs_cmd_default;
<------>u8 hw_id;
<------>int calibscale;
<------>int mlux_per_bit;
<------>int mlux_per_bit_base_it;
};
 
static struct cm3232_als_info cm3232_als_info_default = {
<------>.regs_cmd_default = CM3232_CMD_DEFAULT,
<------>.hw_id = CM3232_HW_ID,
<------>.calibscale = CM3232_CALIBSCALE_DEFAULT,
<------>.mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT,
<------>.mlux_per_bit_base_it = CM3232_MLUX_PER_BIT_BASE_IT,
};
 
struct cm3232_chip {
<------>struct i2c_client *client;
<------>struct cm3232_als_info *als_info;
<------>u8 regs_cmd;
<------>u16 regs_als;
};
 
/**
 * cm3232_reg_init() - Initialize CM3232
 * @chip:	pointer of struct cm3232_chip.
 *
 * Check and initialize CM3232 ambient light sensor.
 *
 * Return: 0 for success; otherwise for error code.
 */
static int cm3232_reg_init(struct cm3232_chip *chip)
{
<------>struct i2c_client *client = chip->client;
<------>s32 ret;
 
<------>chip->als_info = &cm3232_als_info_default;
 
<------>/* Identify device */
<------>ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID);
<------>if (ret < 0) {
<------><------>dev_err(&chip->client->dev, "Error reading addr_id\n");
<------><------>return ret;
<------>}
 
<------>if ((ret & 0xFF) != chip->als_info->hw_id)
<------><------>return -ENODEV;
 
<------>/* Disable and reset device */
<------>chip->regs_cmd = CM3232_CMD_ALS_DISABLE | CM3232_CMD_ALS_RESET;
<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
<------><------><------><------><------>chip->regs_cmd);
<------>if (ret < 0) {
<------><------>dev_err(&chip->client->dev, "Error writing reg_cmd\n");
<------><------>return ret;
<------>}
 
<------>/* Register default value */
<------>chip->regs_cmd = chip->als_info->regs_cmd_default;
 
<------>/* Configure register */
<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
<------><------><------><------><------>chip->regs_cmd);
<------>if (ret < 0)
<------><------>dev_err(&chip->client->dev, "Error writing reg_cmd\n");
 
<------>return ret;
}
 
/**
 *  cm3232_read_als_it() - Get sensor integration time
 *  @chip:	pointer of struct cm3232_chip
 *  @val:	pointer of int to load the integration (sec).
 *  @val2:	pointer of int to load the integration time (microsecond).
 *
 *  Report the current integration time.
 *
 *  Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
 */
static int cm3232_read_als_it(struct cm3232_chip *chip, int *val, int *val2)
{
<------>u16 als_it;
<------>int i;
 
<------>als_it = chip->regs_cmd;
<------>als_it &= CM3232_CMD_ALS_IT_MASK;
<------>als_it >>= CM3232_CMD_ALS_IT_SHIFT;
<------>for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
<------><------>if (als_it == cm3232_als_it_scales[i].it) {
<------><------><------>*val = cm3232_als_it_scales[i].val;
<------><------><------>*val2 = cm3232_als_it_scales[i].val2;
<------><------><------>return IIO_VAL_INT_PLUS_MICRO;
<------><------>}
<------>}
 
<------>return -EINVAL;
}
 
/**
 * cm3232_write_als_it() - Write sensor integration time
 * @chip:	pointer of struct cm3232_chip.
 * @val:	integration time in second.
 * @val2:	integration time in microsecond.
 *
 * Convert integration time to sensor value.
 *
 * Return: i2c_smbus_write_byte_data command return value.
 */
static int cm3232_write_als_it(struct cm3232_chip *chip, int val, int val2)
{
<------>struct i2c_client *client = chip->client;
<------>u16 als_it, cmd;
<------>int i;
<------>s32 ret;
 
<------>for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
<------><------>if (val == cm3232_als_it_scales[i].val &&
<------><------><------>val2 == cm3232_als_it_scales[i].val2) {
 
<------><------><------>als_it = cm3232_als_it_scales[i].it;
<------><------><------>als_it <<= CM3232_CMD_ALS_IT_SHIFT;
 
<------><------><------>cmd = chip->regs_cmd & ~CM3232_CMD_ALS_IT_MASK;
<------><------><------>cmd |= als_it;
<------><------><------>ret = i2c_smbus_write_byte_data(client,
<------><------><------><------><------><------><------>CM3232_REG_ADDR_CMD,
<------><------><------><------><------><------><------>cmd);
<------><------><------>if (ret < 0)
<------><------><------><------>return ret;
<------><------><------>chip->regs_cmd = cmd;
<------><------><------>return 0;
<------><------>}
<------>}
<------>return -EINVAL;
}
 
/**
 * cm3232_get_lux() - report current lux value
 * @chip:	pointer of struct cm3232_chip.
 *
 * Convert sensor data to lux.  It depends on integration
 * time and calibscale variable.
 *
 * Return: Zero or positive value is lux, otherwise error code.
 */
static int cm3232_get_lux(struct cm3232_chip *chip)
{
<------>struct i2c_client *client = chip->client;
<------>struct cm3232_als_info *als_info = chip->als_info;
<------>int ret;
<------>int val, val2;
<------>int als_it;
<------>u64 lux;
 
<------>/* Calculate mlux per bit based on als_it */
<------>ret = cm3232_read_als_it(chip, &val, &val2);
<------>if (ret < 0)
<------><------>return -EINVAL;
<------>als_it = val * 1000000 + val2;
<------>lux = (__force u64)als_info->mlux_per_bit;
<------>lux *= als_info->mlux_per_bit_base_it;
<------>lux = div_u64(lux, als_it);
 
<------>ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ALS);
<------>if (ret < 0) {
<------><------>dev_err(&client->dev, "Error reading reg_addr_als\n");
<------><------>return ret;
<------>}
 
<------>chip->regs_als = (u16)ret;
<------>lux *= chip->regs_als;
<------>lux *= als_info->calibscale;
<------>lux = div_u64(lux, CM3232_CALIBSCALE_RESOLUTION);
<------>lux = div_u64(lux, CM3232_MLUX_PER_LUX);
 
<------>if (lux > 0xFFFF)
<------><------>lux = 0xFFFF;
 
<------>return (int)lux;
}
 
static int cm3232_read_raw(struct iio_dev *indio_dev,
<------><------><------>struct iio_chan_spec const *chan,
<------><------><------>int *val, int *val2, long mask)
{
<------>struct cm3232_chip *chip = iio_priv(indio_dev);
<------>struct cm3232_als_info *als_info = chip->als_info;
<------>int ret;
 
<------>switch (mask) {
<------>case IIO_CHAN_INFO_PROCESSED:
<------><------>ret = cm3232_get_lux(chip);
<------><------>if (ret < 0)
<------><------><------>return ret;
<------><------>*val = ret;
<------><------>return IIO_VAL_INT;
<------>case IIO_CHAN_INFO_CALIBSCALE:
<------><------>*val = als_info->calibscale;
<------><------>return IIO_VAL_INT;
<------>case IIO_CHAN_INFO_INT_TIME:
<------><------>return cm3232_read_als_it(chip, val, val2);
<------>}
 
<------>return -EINVAL;
}
 
static int cm3232_write_raw(struct iio_dev *indio_dev,
<------><------><------>struct iio_chan_spec const *chan,
<------><------><------>int val, int val2, long mask)
{
<------>struct cm3232_chip *chip = iio_priv(indio_dev);
<------>struct cm3232_als_info *als_info = chip->als_info;
 
<------>switch (mask) {
<------>case IIO_CHAN_INFO_CALIBSCALE:
<------><------>als_info->calibscale = val;
<------><------>return 0;
<------>case IIO_CHAN_INFO_INT_TIME:
<------><------>return cm3232_write_als_it(chip, val, val2);
<------>}
 
<------>return -EINVAL;
}
 
/**
 * cm3232_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 in second.
 *
 * Return: string length.
 */
static ssize_t cm3232_get_it_available(struct device *dev,
<------><------><------>struct device_attribute *attr, char *buf)
{
<------>int i, len;
 
<------>for (i = 0, len = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++)
<------><------>len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ",
<------><------><------>cm3232_als_it_scales[i].val,
<------><------><------>cm3232_als_it_scales[i].val2);
<------>return len + scnprintf(buf + len, PAGE_SIZE - len, "\n");
}
 
static const struct iio_chan_spec cm3232_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, cm3232_get_it_available, NULL, 0);
 
static struct attribute *cm3232_attributes[] = {
<------>&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
<------>NULL,
};
 
static const struct attribute_group cm3232_attribute_group = {
<------>.attrs = cm3232_attributes
};
 
static const struct iio_info cm3232_info = {
<------>.read_raw		= &cm3232_read_raw,
<------>.write_raw		= &cm3232_write_raw,
<------>.attrs			= &cm3232_attribute_group,
};
 
static int cm3232_probe(struct i2c_client *client,
<------><------><------>const struct i2c_device_id *id)
{
<------>struct cm3232_chip *chip;
<------>struct iio_dev *indio_dev;
<------>int ret;
 
<------>indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
<------>if (!indio_dev)
<------><------>return -ENOMEM;
 
<------>chip = iio_priv(indio_dev);
<------>i2c_set_clientdata(client, indio_dev);
<------>chip->client = client;
 
<------>indio_dev->channels = cm3232_channels;
<------>indio_dev->num_channels = ARRAY_SIZE(cm3232_channels);
<------>indio_dev->info = &cm3232_info;
<------>indio_dev->name = id->name;
<------>indio_dev->modes = INDIO_DIRECT_MODE;
 
<------>ret = cm3232_reg_init(chip);
<------>if (ret) {
<------><------>dev_err(&client->dev,
<------><------><------>"%s: register init failed\n",
<------><------><------>__func__);
<------><------>return ret;
<------>}
 
<------>return iio_device_register(indio_dev);
}
 
static int cm3232_remove(struct i2c_client *client)
{
<------>struct iio_dev *indio_dev = i2c_get_clientdata(client);
 
<------>i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
<------><------>CM3232_CMD_ALS_DISABLE);
 
<------>iio_device_unregister(indio_dev);
 
<------>return 0;
}
 
static const struct i2c_device_id cm3232_id[] = {
<------>{"cm3232", 0},
<------>{}
};
 
#ifdef CONFIG_PM_SLEEP
static int cm3232_suspend(struct device *dev)
{
<------>struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
<------>struct cm3232_chip *chip = iio_priv(indio_dev);
<------>struct i2c_client *client = chip->client;
<------>int ret;
 
<------>chip->regs_cmd |= CM3232_CMD_ALS_DISABLE;
<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
<------><------><------><------><------>chip->regs_cmd);
 
<------>return ret;
}
 
static int cm3232_resume(struct device *dev)
{
<------>struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
<------>struct cm3232_chip *chip = iio_priv(indio_dev);
<------>struct i2c_client *client = chip->client;
<------>int ret;
 
<------>chip->regs_cmd &= ~CM3232_CMD_ALS_DISABLE;
<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
<------><------><------><------><------>chip->regs_cmd | CM3232_CMD_ALS_RESET);
 
<------>return ret;
}
 
static const struct dev_pm_ops cm3232_pm_ops = {
<------>SET_SYSTEM_SLEEP_PM_OPS(cm3232_suspend, cm3232_resume)};
#endif
 
MODULE_DEVICE_TABLE(i2c, cm3232_id);
 
static const struct of_device_id cm3232_of_match[] = {
<------>{.compatible = "capella,cm3232"},
<------>{}
};
MODULE_DEVICE_TABLE(of, cm3232_of_match);
 
static struct i2c_driver cm3232_driver = {
<------>.driver = {
<------><------>.name	= "cm3232",
<------><------>.of_match_table = cm3232_of_match,
#ifdef CONFIG_PM_SLEEP
<------><------>.pm	= &cm3232_pm_ops,
#endif
<------>},
<------>.id_table	= cm3232_id,
<------>.probe		= cm3232_probe,
<------>.remove		= cm3232_remove,
};
 
module_i2c_driver(cm3232_driver);
 
MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
MODULE_DESCRIPTION("CM3232 ambient light sensor driver");
MODULE_LICENSE("GPL");

	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* CM3232 Ambient Light Sensor
	*
	* Copyright (C) 2014-2015 Capella Microsystems Inc.
	* Author: Kevin Tsai <ktsai@capellamicro.com>
	*
	* IIO driver for CM3232 (7-bit I2C slave address 0x10).
	*/

	#include <linux/i2c.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/init.h>

	/* Registers Address */
	#define CM3232_REG_ADDR_CMD 0x00
	#define CM3232_REG_ADDR_ALS 0x50
	#define CM3232_REG_ADDR_ID 0x53

	#define CM3232_CMD_ALS_DISABLE BIT(0)

	#define CM3232_CMD_ALS_IT_SHIFT 2
	#define CM3232_CMD_ALS_IT_MASK (BIT(2) \| BIT(3) \| BIT(4))
	#define CM3232_CMD_ALS_IT_DEFAULT (0x01 << CM3232_CMD_ALS_IT_SHIFT)

	#define CM3232_CMD_ALS_RESET BIT(6)

	#define CM3232_CMD_DEFAULT CM3232_CMD_ALS_IT_DEFAULT

	#define CM3232_HW_ID 0x32
	#define CM3232_CALIBSCALE_DEFAULT 100000
	#define CM3232_CALIBSCALE_RESOLUTION 100000
	#define CM3232_MLUX_PER_LUX 1000

	#define CM3232_MLUX_PER_BIT_DEFAULT 64
	#define CM3232_MLUX_PER_BIT_BASE_IT 100000

	static const struct {
	<------>int val;
	<------>int val2;
	<------>u8 it;
	} cm3232_als_it_scales[] = {
	<------>{0, 100000, 0}, /* 0.100000 */
	<------>{0, 200000, 1}, /* 0.200000 */
	<------>{0, 400000, 2}, /* 0.400000 */
	<------>{0, 800000, 3}, /* 0.800000 */
	<------>{1, 600000, 4}, /* 1.600000 */
	<------>{3, 200000, 5}, /* 3.200000 */
	};

	struct cm3232_als_info {
	<------>u8 regs_cmd_default;
	<------>u8 hw_id;
	<------>int calibscale;
	<------>int mlux_per_bit;
	<------>int mlux_per_bit_base_it;
	};

	static struct cm3232_als_info cm3232_als_info_default = {
	<------>.regs_cmd_default = CM3232_CMD_DEFAULT,
	<------>.hw_id = CM3232_HW_ID,
	<------>.calibscale = CM3232_CALIBSCALE_DEFAULT,
	<------>.mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT,
	<------>.mlux_per_bit_base_it = CM3232_MLUX_PER_BIT_BASE_IT,
	};

	struct cm3232_chip {
	<------>struct i2c_client *client;
	<------>struct cm3232_als_info *als_info;
	<------>u8 regs_cmd;
	<------>u16 regs_als;
	};

	/**
	* cm3232_reg_init() - Initialize CM3232
	* @chip: pointer of struct cm3232_chip.
	*
	* Check and initialize CM3232 ambient light sensor.
	*
	* Return: 0 for success; otherwise for error code.
	*/
	static int cm3232_reg_init(struct cm3232_chip *chip)
	{
	<------>struct i2c_client *client = chip->client;
	<------>s32 ret;

	<------>chip->als_info = &cm3232_als_info_default;

	<------>/* Identify device */
	<------>ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID);
	<------>if (ret < 0) {
	<------><------>dev_err(&chip->client->dev, "Error reading addr_id\n");
	<------><------>return ret;
	<------>}

	<------>if ((ret & 0xFF) != chip->als_info->hw_id)
	<------><------>return -ENODEV;

	<------>/* Disable and reset device */
	<------>chip->regs_cmd = CM3232_CMD_ALS_DISABLE \| CM3232_CMD_ALS_RESET;
	<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	<------><------><------><------><------>chip->regs_cmd);
	<------>if (ret < 0) {
	<------><------>dev_err(&chip->client->dev, "Error writing reg_cmd\n");
	<------><------>return ret;
	<------>}

	<------>/* Register default value */
	<------>chip->regs_cmd = chip->als_info->regs_cmd_default;

	<------>/* Configure register */
	<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	<------><------><------><------><------>chip->regs_cmd);
	<------>if (ret < 0)
	<------><------>dev_err(&chip->client->dev, "Error writing reg_cmd\n");

	<------>return ret;
	}

	/**
	* cm3232_read_als_it() - Get sensor integration time
	* @chip: pointer of struct cm3232_chip
	* @val: pointer of int to load the integration (sec).
	* @val2: pointer of int to load the integration time (microsecond).
	*
	* Report the current integration time.
	*
	* Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
	*/
	static int cm3232_read_als_it(struct cm3232_chip chip, int val, int *val2)
	{
	<------>u16 als_it;
	<------>int i;

	<------>als_it = chip->regs_cmd;
	<------>als_it &= CM3232_CMD_ALS_IT_MASK;
	<------>als_it >>= CM3232_CMD_ALS_IT_SHIFT;
	<------>for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
	<------><------>if (als_it == cm3232_als_it_scales[i].it) {
	<------><------><------>*val = cm3232_als_it_scales[i].val;
	<------><------><------>*val2 = cm3232_als_it_scales[i].val2;
	<------><------><------>return IIO_VAL_INT_PLUS_MICRO;
	<------><------>}
	<------>}

	<------>return -EINVAL;
	}

	/**
	* cm3232_write_als_it() - Write sensor integration time
	* @chip: pointer of struct cm3232_chip.
	* @val: integration time in second.
	* @val2: integration time in microsecond.
	*
	* Convert integration time to sensor value.
	*
	* Return: i2c_smbus_write_byte_data command return value.
	*/
	static int cm3232_write_als_it(struct cm3232_chip *chip, int val, int val2)
	{
	<------>struct i2c_client *client = chip->client;
	<------>u16 als_it, cmd;
	<------>int i;
	<------>s32 ret;

	<------>for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
	<------><------>if (val == cm3232_als_it_scales[i].val &&
	<------><------><------>val2 == cm3232_als_it_scales[i].val2) {

	<------><------><------>als_it = cm3232_als_it_scales[i].it;
	<------><------><------>als_it <<= CM3232_CMD_ALS_IT_SHIFT;

	<------><------><------>cmd = chip->regs_cmd & ~CM3232_CMD_ALS_IT_MASK;
	<------><------><------>cmd \|= als_it;
	<------><------><------>ret = i2c_smbus_write_byte_data(client,
	<------><------><------><------><------><------><------>CM3232_REG_ADDR_CMD,
	<------><------><------><------><------><------><------>cmd);
	<------><------><------>if (ret < 0)
	<------><------><------><------>return ret;
	<------><------><------>chip->regs_cmd = cmd;
	<------><------><------>return 0;
	<------><------>}
	<------>}
	<------>return -EINVAL;
	}

	/**
	* cm3232_get_lux() - report current lux value
	* @chip: pointer of struct cm3232_chip.
	*
	* Convert sensor data to lux. It depends on integration
	* time and calibscale variable.
	*
	* Return: Zero or positive value is lux, otherwise error code.
	*/
	static int cm3232_get_lux(struct cm3232_chip *chip)
	{
	<------>struct i2c_client *client = chip->client;
	<------>struct cm3232_als_info *als_info = chip->als_info;
	<------>int ret;
	<------>int val, val2;
	<------>int als_it;
	<------>u64 lux;

	<------>/* Calculate mlux per bit based on als_it */
	<------>ret = cm3232_read_als_it(chip, &val, &val2);
	<------>if (ret < 0)
	<------><------>return -EINVAL;
	<------>als_it = val * 1000000 + val2;
	<------>lux = (__force u64)als_info->mlux_per_bit;
	<------>lux *= als_info->mlux_per_bit_base_it;
	<------>lux = div_u64(lux, als_it);

	<------>ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ALS);
	<------>if (ret < 0) {
	<------><------>dev_err(&client->dev, "Error reading reg_addr_als\n");
	<------><------>return ret;
	<------>}

	<------>chip->regs_als = (u16)ret;
	<------>lux *= chip->regs_als;
	<------>lux *= als_info->calibscale;
	<------>lux = div_u64(lux, CM3232_CALIBSCALE_RESOLUTION);
	<------>lux = div_u64(lux, CM3232_MLUX_PER_LUX);

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

	<------>return (int)lux;
	}

	static int cm3232_read_raw(struct iio_dev *indio_dev,
	<------><------><------>struct iio_chan_spec const *chan,
	<------><------><------>int val, int val2, long mask)
	{
	<------>struct cm3232_chip *chip = iio_priv(indio_dev);
	<------>struct cm3232_als_info *als_info = chip->als_info;
	<------>int ret;

	<------>switch (mask) {
	<------>case IIO_CHAN_INFO_PROCESSED:
	<------><------>ret = cm3232_get_lux(chip);
	<------><------>if (ret < 0)
	<------><------><------>return ret;
	<------><------>*val = ret;
	<------><------>return IIO_VAL_INT;
	<------>case IIO_CHAN_INFO_CALIBSCALE:
	<------><------>*val = als_info->calibscale;
	<------><------>return IIO_VAL_INT;
	<------>case IIO_CHAN_INFO_INT_TIME:
	<------><------>return cm3232_read_als_it(chip, val, val2);
	<------>}

	<------>return -EINVAL;
	}

	static int cm3232_write_raw(struct iio_dev *indio_dev,
	<------><------><------>struct iio_chan_spec const *chan,
	<------><------><------>int val, int val2, long mask)
	{
	<------>struct cm3232_chip *chip = iio_priv(indio_dev);
	<------>struct cm3232_als_info *als_info = chip->als_info;

	<------>switch (mask) {
	<------>case IIO_CHAN_INFO_CALIBSCALE:
	<------><------>als_info->calibscale = val;
	<------><------>return 0;
	<------>case IIO_CHAN_INFO_INT_TIME:
	<------><------>return cm3232_write_als_it(chip, val, val2);
	<------>}

	<------>return -EINVAL;
	}

	/**
	* cm3232_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 in second.
	*
	* Return: string length.
	*/
	static ssize_t cm3232_get_it_available(struct device *dev,
	<------><------><------>struct device_attribute attr, char buf)
	{
	<------>int i, len;

	<------>for (i = 0, len = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++)
	<------><------>len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ",
	<------><------><------>cm3232_als_it_scales[i].val,
	<------><------><------>cm3232_als_it_scales[i].val2);
	<------>return len + scnprintf(buf + len, PAGE_SIZE - len, "\n");
	}

	static const struct iio_chan_spec cm3232_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, cm3232_get_it_available, NULL, 0);

	static struct attribute *cm3232_attributes[] = {
	<------>&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
	<------>NULL,
	};

	static const struct attribute_group cm3232_attribute_group = {
	<------>.attrs = cm3232_attributes
	};

	static const struct iio_info cm3232_info = {
	<------>.read_raw = &cm3232_read_raw,
	<------>.write_raw = &cm3232_write_raw,
	<------>.attrs = &cm3232_attribute_group,
	};

	static int cm3232_probe(struct i2c_client *client,
	<------><------><------>const struct i2c_device_id *id)
	{
	<------>struct cm3232_chip *chip;
	<------>struct iio_dev *indio_dev;
	<------>int ret;

	<------>indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
	<------>if (!indio_dev)
	<------><------>return -ENOMEM;

	<------>chip = iio_priv(indio_dev);
	<------>i2c_set_clientdata(client, indio_dev);
	<------>chip->client = client;

	<------>indio_dev->channels = cm3232_channels;
	<------>indio_dev->num_channels = ARRAY_SIZE(cm3232_channels);
	<------>indio_dev->info = &cm3232_info;
	<------>indio_dev->name = id->name;
	<------>indio_dev->modes = INDIO_DIRECT_MODE;

	<------>ret = cm3232_reg_init(chip);
	<------>if (ret) {
	<------><------>dev_err(&client->dev,
	<------><------><------>"%s: register init failed\n",
	<------><------><------>__func__);
	<------><------>return ret;
	<------>}

	<------>return iio_device_register(indio_dev);
	}

	static int cm3232_remove(struct i2c_client *client)
	{
	<------>struct iio_dev *indio_dev = i2c_get_clientdata(client);

	<------>i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	<------><------>CM3232_CMD_ALS_DISABLE);

	<------>iio_device_unregister(indio_dev);

	<------>return 0;
	}

	static const struct i2c_device_id cm3232_id[] = {
	<------>{"cm3232", 0},
	<------>{}
	};

	#ifdef CONFIG_PM_SLEEP
	static int cm3232_suspend(struct device *dev)
	{
	<------>struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	<------>struct cm3232_chip *chip = iio_priv(indio_dev);
	<------>struct i2c_client *client = chip->client;
	<------>int ret;

	<------>chip->regs_cmd \|= CM3232_CMD_ALS_DISABLE;
	<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	<------><------><------><------><------>chip->regs_cmd);

	<------>return ret;
	}

	static int cm3232_resume(struct device *dev)
	{
	<------>struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	<------>struct cm3232_chip *chip = iio_priv(indio_dev);
	<------>struct i2c_client *client = chip->client;
	<------>int ret;

	<------>chip->regs_cmd &= ~CM3232_CMD_ALS_DISABLE;
	<------>ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
	<------><------><------><------><------>chip->regs_cmd \| CM3232_CMD_ALS_RESET);

	<------>return ret;
	}

	static const struct dev_pm_ops cm3232_pm_ops = {
	<------>SET_SYSTEM_SLEEP_PM_OPS(cm3232_suspend, cm3232_resume)};
	#endif

	MODULE_DEVICE_TABLE(i2c, cm3232_id);

	static const struct of_device_id cm3232_of_match[] = {
	<------>{.compatible = "capella,cm3232"},
	<------>{}
	};
	MODULE_DEVICE_TABLE(of, cm3232_of_match);

	static struct i2c_driver cm3232_driver = {
	<------>.driver = {
	<------><------>.name = "cm3232",
	<------><------>.of_match_table = cm3232_of_match,
	#ifdef CONFIG_PM_SLEEP
	<------><------>.pm = &cm3232_pm_ops,
	#endif
	<------>},
	<------>.id_table = cm3232_id,
	<------>.probe = cm3232_probe,
	<------>.remove = cm3232_remove,
	};

	module_i2c_driver(cm3232_driver);

	MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
	MODULE_DESCRIPTION("CM3232 ambient light sensor driver");
	MODULE_LICENSE("GPL");