mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
3.3 KiB
143 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* MS5611 pressure and temperature sensor driver (I2C bus) |
|
* |
|
* Copyright (c) Tomasz Duszynski <[email protected]> |
|
* |
|
* 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 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 = get_unaligned_be24(&buf[0]); |
|
|
|
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; |
|
|
|
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) |
|
{ |
|
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 int ms5611_i2c_remove(struct i2c_client *client) |
|
{ |
|
return ms5611_remove(i2c_get_clientdata(client)); |
|
} |
|
|
|
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 = ms5611_i2c_probe, |
|
.remove = ms5611_i2c_remove, |
|
}; |
|
module_i2c_driver(ms5611_driver); |
|
|
|
MODULE_AUTHOR("Tomasz Duszynski <[email protected]>"); |
|
MODULE_DESCRIPTION("MS5611 i2c driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|