linux/drivers/iio/chemical/ags02ma.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2023 Anshul Dalal <[email protected]>
 *
 * Driver for Aosong AGS02MA
 *
 * Datasheet:
 *   https://asairsensors.com/wp-content/uploads/2021/09/AGS02MA.pdf
 * Product Page:
 *   http://www.aosong.com/m/en/products-33.html
 */

#include <linux/crc8.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>

#include <linux/iio/iio.h>

#define AGS02MA_TVOC_READ_REG …
#define AGS02MA_VERSION_REG …

#define AGS02MA_VERSION_PROCESSING_DELAY …
#define AGS02MA_TVOC_READ_PROCESSING_DELAY …

#define AGS02MA_CRC8_INIT …
#define AGS02MA_CRC8_POLYNOMIAL …

DECLARE_CRC8_TABLE(ags02ma_crc8_table);

struct ags02ma_data { … };

struct ags02ma_reading { … } __packed;

static int ags02ma_register_read(struct i2c_client *client, u8 reg, u16 delay,
				 u32 *val)
{ … }

static int ags02ma_read_raw(struct iio_dev *iio_device,
			    struct iio_chan_spec const *chan, int *val,
			    int *val2, long mask)
{ … }

static const struct iio_info ags02ma_info = …;

static const struct iio_chan_spec ags02ma_channel = …;

static int ags02ma_probe(struct i2c_client *client)
{ … }

static const struct i2c_device_id ags02ma_id_table[] = …;
MODULE_DEVICE_TABLE(i2c, ags02ma_id_table);

static const struct of_device_id ags02ma_of_table[] = …;
MODULE_DEVICE_TABLE(of, ags02ma_of_table);

static struct i2c_driver ags02ma_driver = …;
module_i2c_driver(…) …;

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