linux/drivers/iio/humidity/am2315.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Aosong AM2315 relative humidity and temperature
 *
 * Copyright (c) 2016, Intel Corporation.
 *
 * 7-bit I2C address: 0x5C.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#define AM2315_REG_HUM_MSB …
#define AM2315_REG_HUM_LSB …
#define AM2315_REG_TEMP_MSB …
#define AM2315_REG_TEMP_LSB …

#define AM2315_FUNCTION_READ …
#define AM2315_HUM_OFFSET …
#define AM2315_TEMP_OFFSET …
#define AM2315_ALL_CHANNEL_MASK …

#define AM2315_DRIVER_NAME …

struct am2315_data { … };

struct am2315_sensor_data { … };

static const struct iio_chan_spec am2315_channels[] = …;

/* CRC calculation algorithm, as specified in the datasheet (page 13). */
static u16 am2315_crc(u8 *data, u8 nr_bytes)
{ … }

/* Simple function that sends a few bytes to the device to wake it up. */
static void am2315_ping(struct i2c_client *client)
{ … }

static int am2315_read_data(struct am2315_data *data,
			    struct am2315_sensor_data *sensor_data)
{ … }

static irqreturn_t am2315_trigger_handler(int irq, void *p)
{ … }

static int am2315_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2, long mask)
{ … }

static const struct iio_info am2315_info = …;

static int am2315_probe(struct i2c_client *client)
{ … }

static const struct i2c_device_id am2315_i2c_id[] = …;
MODULE_DEVICE_TABLE(i2c, am2315_i2c_id);

static struct i2c_driver am2315_driver = …;

module_i2c_driver(…) …;

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