2 * MS5611 pressure and temperature sensor driver (SPI bus)
4 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <linux/delay.h>
13 #include <linux/module.h>
14 #include <linux/spi/spi.h>
15 #include <linux/of_device.h>
19 static int ms5611_spi_reset(struct device *dev)
21 u8 cmd = MS5611_RESET;
22 struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
24 return spi_write_then_read(st->client, &cmd, 1, NULL, 0);
27 static int ms5611_spi_read_prom_word(struct device *dev, int index, u16 *word)
30 struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
32 ret = spi_w8r16be(st->client, MS5611_READ_PROM_WORD + (index << 1));
41 static int ms5611_spi_read_adc(struct device *dev, s32 *val)
44 u8 buf[3] = { MS5611_READ_ADC };
45 struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
47 ret = spi_write_then_read(st->client, buf, 1, buf, 3);
51 *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
56 static int ms5611_spi_read_adc_temp_and_pressure(struct device *dev,
57 s32 *temp, s32 *pressure)
61 struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
63 cmd = MS5611_START_TEMP_CONV;
64 ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
68 usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
70 ret = ms5611_spi_read_adc(dev, temp);
74 cmd = MS5611_START_PRESSURE_CONV;
75 ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
79 usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
81 return ms5611_spi_read_adc(dev, pressure);
84 static int ms5611_spi_probe(struct spi_device *spi)
87 struct ms5611_state *st;
88 struct iio_dev *indio_dev;
90 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
94 spi_set_drvdata(spi, indio_dev);
96 spi->mode = SPI_MODE_0;
97 spi->max_speed_hz = 20000000;
98 spi->bits_per_word = 8;
103 st = iio_priv(indio_dev);
104 st->reset = ms5611_spi_reset;
105 st->read_prom_word = ms5611_spi_read_prom_word;
106 st->read_adc_temp_and_pressure = ms5611_spi_read_adc_temp_and_pressure;
109 return ms5611_probe(indio_dev, &spi->dev, spi_get_device_id(spi)->name,
110 spi_get_device_id(spi)->driver_data);
113 static int ms5611_spi_remove(struct spi_device *spi)
115 return ms5611_remove(spi_get_drvdata(spi));
118 #if defined(CONFIG_OF)
119 static const struct of_device_id ms5611_spi_matches[] = {
120 { .compatible = "meas,ms5611" },
121 { .compatible = "ms5611" },
122 { .compatible = "meas,ms5607" },
123 { .compatible = "ms5607" },
126 MODULE_DEVICE_TABLE(of, ms5611_spi_matches);
129 static const struct spi_device_id ms5611_id[] = {
130 { "ms5611", MS5611 },
131 { "ms5607", MS5607 },
134 MODULE_DEVICE_TABLE(spi, ms5611_id);
136 static struct spi_driver ms5611_driver = {
139 .of_match_table = of_match_ptr(ms5611_spi_matches)
141 .id_table = ms5611_id,
142 .probe = ms5611_spi_probe,
143 .remove = ms5611_spi_remove,
145 module_spi_driver(ms5611_driver);
147 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
148 MODULE_DESCRIPTION("MS5611 spi driver");
149 MODULE_LICENSE("GPL v2");