9690d81a02
MS5607 is temperature and pressure sensor which hardware is similar to MS5611. Both sensors share command protocol and support both I2C and SPI serial protocols. They only differ in compensation algorithms. 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
/*
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* MS5611 pressure and temperature sensor driver (SPI bus)
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*
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* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include "ms5611.h"
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static int ms5611_spi_reset(struct device *dev)
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{
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u8 cmd = MS5611_RESET;
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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return spi_write_then_read(st->client, &cmd, 1, NULL, 0);
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}
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static int ms5611_spi_read_prom_word(struct device *dev, int index, u16 *word)
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{
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int ret;
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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ret = spi_w8r16be(st->client, 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_spi_read_adc(struct device *dev, s32 *val)
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{
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int ret;
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u8 buf[3] = { MS5611_READ_ADC };
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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ret = spi_write_then_read(st->client, buf, 1, buf, 3);
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if (ret < 0)
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return ret;
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*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
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return 0;
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}
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static int ms5611_spi_read_adc_temp_and_pressure(struct device *dev,
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s32 *temp, s32 *pressure)
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{
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u8 cmd;
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int ret;
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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cmd = MS5611_START_TEMP_CONV;
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ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
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if (ret < 0)
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return ret;
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usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
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ret = ms5611_spi_read_adc(dev, temp);
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if (ret < 0)
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return ret;
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cmd = MS5611_START_PRESSURE_CONV;
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ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
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if (ret < 0)
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return ret;
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usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
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return ms5611_spi_read_adc(dev, pressure);
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}
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static int ms5611_spi_probe(struct spi_device *spi)
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{
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int ret;
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struct ms5611_state *st;
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struct iio_dev *indio_dev;
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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spi->mode = SPI_MODE_0;
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spi->max_speed_hz = 20000000;
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spi->bits_per_word = 8;
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ret = spi_setup(spi);
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if (ret < 0)
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return ret;
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st = iio_priv(indio_dev);
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st->reset = ms5611_spi_reset;
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st->read_prom_word = ms5611_spi_read_prom_word;
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st->read_adc_temp_and_pressure = ms5611_spi_read_adc_temp_and_pressure;
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st->client = spi;
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return ms5611_probe(indio_dev, &spi->dev,
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spi_get_device_id(spi)->driver_data);
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}
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static const struct spi_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(spi, ms5611_id);
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static struct spi_driver ms5611_driver = {
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.driver = {
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.name = "ms5611",
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.owner = THIS_MODULE,
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},
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.id_table = ms5611_id,
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.probe = ms5611_spi_probe,
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};
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module_spi_driver(ms5611_driver);
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MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
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MODULE_DESCRIPTION("MS5611 spi driver");
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MODULE_LICENSE("GPL v2");
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