linux/drivers/iio/light/cm3232.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * CM3232 Ambient Light Sensor
 *
 * Copyright (C) 2014-2015 Capella Microsystems Inc.
 * Author: Kevin Tsai <[email protected]>
 *
 * 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 …
#define CM3232_REG_ADDR_ALS …
#define CM3232_REG_ADDR_ID …

#define CM3232_CMD_ALS_DISABLE …

#define CM3232_CMD_ALS_IT_SHIFT …
#define CM3232_CMD_ALS_IT_MASK …
#define CM3232_CMD_ALS_IT_DEFAULT …

#define CM3232_CMD_ALS_RESET …

#define CM3232_CMD_DEFAULT …

#define CM3232_HW_ID …
#define CM3232_CALIBSCALE_DEFAULT …
#define CM3232_CALIBSCALE_RESOLUTION …
#define CM3232_MLUX_PER_LUX …

#define CM3232_MLUX_PER_BIT_DEFAULT …
#define CM3232_MLUX_PER_BIT_BASE_IT …

static const struct { … } cm3232_als_it_scales[] = …;

struct cm3232_als_info { … };

static struct cm3232_als_info cm3232_als_info_default = …;

struct cm3232_chip { … };

/**
 * 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)
{ … }

/**
 *  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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

static int cm3232_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int *val, int *val2, long mask)
{ … }

static int cm3232_write_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int val, int val2, long mask)
{ … }

/**
 * 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)
{ … }

static const struct iio_chan_spec cm3232_channels[] = …;

static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
			S_IRUGO, cm3232_get_it_available, NULL, 0);

static struct attribute *cm3232_attributes[] = …;

static const struct attribute_group cm3232_attribute_group = …;

static const struct iio_info cm3232_info = …;

static int cm3232_probe(struct i2c_client *client)
{ … }

static void cm3232_remove(struct i2c_client *client)
{ … }

static const struct i2c_device_id cm3232_id[] = …;

static int cm3232_suspend(struct device *dev)
{ … }

static int cm3232_resume(struct device *dev)
{ … }

static DEFINE_SIMPLE_DEV_PM_OPS(cm3232_pm_ops, cm3232_suspend, cm3232_resume);

MODULE_DEVICE_TABLE(i2c, cm3232_id);

static const struct of_device_id cm3232_of_match[] = …;
MODULE_DEVICE_TABLE(of, cm3232_of_match);

static struct i2c_driver cm3232_driver = …;

module_i2c_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;