136 строки
3.0 KiB
C
136 строки
3.0 KiB
C
// 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/mod_devicetable.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
#include "ms5611.h"
|
|
|
|
static int ms5611_i2c_reset(struct ms5611_state *st)
|
|
{
|
|
return i2c_smbus_write_byte(st->client, MS5611_RESET);
|
|
}
|
|
|
|
static int ms5611_i2c_read_prom_word(struct ms5611_state *st, int index,
|
|
u16 *word)
|
|
{
|
|
int ret;
|
|
|
|
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 = get_unaligned_be24(&buf[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ms5611_i2c_read_adc_temp_and_pressure(struct ms5611_state *st,
|
|
s32 *temp, s32 *pressure)
|
|
{
|
|
int ret;
|
|
const struct ms5611_osr *osr = st->temp_osr;
|
|
|
|
ret = i2c_smbus_write_byte(st->client, osr->cmd);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
|
|
ret = ms5611_i2c_read_adc(st, temp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
osr = st->pressure_osr;
|
|
ret = i2c_smbus_write_byte(st->client, osr->cmd);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
|
|
return ms5611_i2c_read_adc(st, pressure);
|
|
}
|
|
|
|
static int ms5611_i2c_probe(struct i2c_client *client)
|
|
{
|
|
const struct i2c_device_id *id = i2c_client_get_device_id(client);
|
|
struct ms5611_state *st;
|
|
struct iio_dev *indio_dev;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BYTE |
|
|
I2C_FUNC_SMBUS_READ_WORD_DATA |
|
|
I2C_FUNC_SMBUS_READ_I2C_BLOCK))
|
|
return -EOPNOTSUPP;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
st = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
st->reset = ms5611_i2c_reset;
|
|
st->read_prom_word = ms5611_i2c_read_prom_word;
|
|
st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
|
|
st->client = client;
|
|
|
|
return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
|
|
}
|
|
|
|
static const struct of_device_id ms5611_i2c_matches[] = {
|
|
{ .compatible = "meas,ms5611" },
|
|
{ .compatible = "meas,ms5607" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
|
|
|
|
static const struct i2c_device_id ms5611_id[] = {
|
|
{ "ms5611", MS5611 },
|
|
{ "ms5607", MS5607 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ms5611_id);
|
|
|
|
static struct i2c_driver ms5611_driver = {
|
|
.driver = {
|
|
.name = "ms5611",
|
|
.of_match_table = ms5611_i2c_matches,
|
|
},
|
|
.id_table = ms5611_id,
|
|
.probe_new = ms5611_i2c_probe,
|
|
};
|
|
module_i2c_driver(ms5611_driver);
|
|
|
|
MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
|
|
MODULE_DESCRIPTION("MS5611 i2c driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_IMPORT_NS(IIO_MS5611);
|