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145 lines
3.3 KiB
145 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* MS5611 pressure and temperature sensor driver (SPI bus) |
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* |
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* Copyright (c) Tomasz Duszynski <[email protected]> |
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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 <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_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 = get_unaligned_be24(&buf[0]); |
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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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int ret; |
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); |
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const struct ms5611_osr *osr = st->temp_osr; |
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/* |
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* Warning: &osr->cmd MUST be aligned on a word boundary since used as |
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* 2nd argument (void*) of spi_write_then_read. |
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*/ |
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ret = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0); |
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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_spi_read_adc(dev, 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 = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0); |
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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_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_set_drvdata(spi, indio_dev); |
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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, spi_get_device_id(spi)->name, |
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spi_get_device_id(spi)->driver_data); |
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} |
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static int ms5611_spi_remove(struct spi_device *spi) |
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{ |
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return ms5611_remove(spi_get_drvdata(spi)); |
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} |
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static const struct of_device_id ms5611_spi_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_spi_matches); |
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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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.of_match_table = ms5611_spi_matches |
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}, |
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.id_table = ms5611_id, |
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.probe = ms5611_spi_probe, |
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.remove = ms5611_spi_remove, |
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}; |
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module_spi_driver(ms5611_driver); |
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MODULE_AUTHOR("Tomasz Duszynski <[email protected]>"); |
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MODULE_DESCRIPTION("MS5611 spi driver"); |
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MODULE_LICENSE("GPL v2");
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