136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MS5611 pressure and temperature sensor driver (I2C bus)
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*
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* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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*
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* 7-bit I2C slave addresses:
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*
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* 0x77 (CSB pin low)
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* 0x76 (CSB pin high)
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*
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <asm/unaligned.h>
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#include "ms5611.h"
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static int ms5611_i2c_reset(struct ms5611_state *st)
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{
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return i2c_smbus_write_byte(st->client, MS5611_RESET);
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}
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static int ms5611_i2c_read_prom_word(struct ms5611_state *st, int index,
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u16 *word)
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{
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int ret;
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ret = i2c_smbus_read_word_swapped(st->client,
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MS5611_READ_PROM_WORD + (index << 1));
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if (ret < 0)
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return ret;
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*word = ret;
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return 0;
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}
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static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
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{
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int ret;
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u8 buf[3];
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ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
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3, buf);
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if (ret < 0)
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return ret;
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*val = get_unaligned_be24(&buf[0]);
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return 0;
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}
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static int ms5611_i2c_read_adc_temp_and_pressure(struct ms5611_state *st,
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s32 *temp, s32 *pressure)
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{
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int ret;
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const struct ms5611_osr *osr = st->temp_osr;
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ret = i2c_smbus_write_byte(st->client, osr->cmd);
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if (ret < 0)
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return ret;
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usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
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ret = ms5611_i2c_read_adc(st, temp);
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if (ret < 0)
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return ret;
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osr = st->pressure_osr;
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ret = i2c_smbus_write_byte(st->client, osr->cmd);
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if (ret < 0)
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return ret;
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usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
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return ms5611_i2c_read_adc(st, pressure);
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}
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static int ms5611_i2c_probe(struct i2c_client *client)
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{
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const struct i2c_device_id *id = i2c_client_get_device_id(client);
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struct ms5611_state *st;
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struct iio_dev *indio_dev;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WRITE_BYTE |
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I2C_FUNC_SMBUS_READ_WORD_DATA |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK))
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return -EOPNOTSUPP;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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st->reset = ms5611_i2c_reset;
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st->read_prom_word = ms5611_i2c_read_prom_word;
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st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
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st->client = client;
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return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
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}
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static const struct of_device_id ms5611_i2c_matches[] = {
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{ .compatible = "meas,ms5611" },
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{ .compatible = "meas,ms5607" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
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static const struct i2c_device_id ms5611_id[] = {
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{ "ms5611", MS5611 },
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{ "ms5607", MS5607 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ms5611_id);
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static struct i2c_driver ms5611_driver = {
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.driver = {
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.name = "ms5611",
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.of_match_table = ms5611_i2c_matches,
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},
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.id_table = ms5611_id,
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.probe = ms5611_i2c_probe,
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};
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module_i2c_driver(ms5611_driver);
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MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
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MODULE_DESCRIPTION("MS5611 i2c driver");
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MODULE_LICENSE("GPL v2");
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MODULE_IMPORT_NS(IIO_MS5611);
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