linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * MS5611 pressure and temperature sensor driver (I2C bus)

 *

 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>

 *

 * 7-bit I2C slave addresses:

 *

 * 0x77 (CSB pin low)

 * 0x76 (CSB pin high)

 *

 */

​

#include <linux/delay.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/of_device.h>

​

#include "ms5611.h"

​

static int ms5611_i2c_reset(struct device *dev)

{

    struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

​

    return i2c_smbus_write_byte(st->client, MS5611_RESET);

}

​

static int ms5611_i2c_read_prom_word(struct device *dev, int index, u16 *word)

{

    int ret;

    struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

​

    ret = i2c_smbus_read_word_swapped(st->client,

            MS5611_READ_PROM_WORD + (index << 1));

    if (ret < 0)

        return ret;

​

    *word = ret;

​

    return 0;

}

​

static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)

{

    int ret;

    u8 buf[3];

​

    ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,

                        3, buf);

    if (ret < 0)

        return ret;

​

    *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];

​

    return 0;

}

​

static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,

                         s32 *temp, s32 *pressure)

{

    int ret;

    struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

    const struct ms5611_osr *osr = st->temp_osr;