mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
c0644160a8
Add support for Measurement Specialities MS5611 pressure and temperature sensor. Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
|
|
* MS5611 pressure and temperature sensor driver (I2C bus)
|
|
*
|
|
* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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 "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));
|
|
|
|
ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
|
|
|
|
ret = ms5611_i2c_read_adc(st, temp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
|
|
|
|
return ms5611_i2c_read_adc(st, pressure);
|
|
}
|
|
|
|
static int ms5611_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
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 -ENODEV;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
st = iio_priv(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);
|
|
}
|
|
|
|
static const struct i2c_device_id ms5611_id[] = {
|
|
{ "ms5611", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ms5611_id);
|
|
|
|
static struct i2c_driver ms5611_driver = {
|
|
.driver = {
|
|
.name = "ms5611",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = ms5611_id,
|
|
.probe = ms5611_i2c_probe,
|
|
};
|
|
module_i2c_driver(ms5611_driver);
|
|
|
|
MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
|
|
MODULE_DESCRIPTION("MS5611 i2c driver");
|
|
MODULE_LICENSE("GPL v2");
|