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https://github.com/edk2-porting/linux-next.git
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033691a9a1
Add support for setting and retrieving OverSampling Rate independently for each of the temperature and pressure channels. This allows userspace to fine tune hardware sampling process according to the following tradeoffs : * the higher the OSR, the finer the resolution ; * the higher the OSR, the lower the noise ; BUT: * the higher the OSR, the larger the drift ; * the higher the OSR, the longer the response time, i.e. less samples per unit of time. Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
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* MS5611 pressure and temperature sensor driver
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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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#ifndef _MS5611_H
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#define _MS5611_H
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#include <linux/device.h>
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#include <linux/iio/iio.h>
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#include <linux/mutex.h>
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#define MS5611_RESET 0x1e
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#define MS5611_READ_ADC 0x00
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#define MS5611_READ_PROM_WORD 0xA0
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#define MS5611_PROM_WORDS_NB 8
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enum {
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MS5611,
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MS5607,
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};
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struct ms5611_chip_info {
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u16 prom[MS5611_PROM_WORDS_NB];
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int (*temp_and_pressure_compensate)(struct ms5611_chip_info *chip_info,
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s32 *temp, s32 *pressure);
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};
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/*
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* OverSampling Rate descriptor.
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* Warning: cmd MUST be kept aligned on a word boundary (see
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* m5611_spi_read_adc_temp_and_pressure in ms5611_spi.c).
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*/
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struct ms5611_osr {
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unsigned long conv_usec;
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u8 cmd;
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unsigned short rate;
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};
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struct ms5611_state {
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void *client;
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struct mutex lock;
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const struct ms5611_osr *pressure_osr;
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const struct ms5611_osr *temp_osr;
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int (*reset)(struct device *dev);
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int (*read_prom_word)(struct device *dev, int index, u16 *word);
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int (*read_adc_temp_and_pressure)(struct device *dev,
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s32 *temp, s32 *pressure);
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struct ms5611_chip_info *chip_info;
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};
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int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
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const char* name, int type);
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int ms5611_remove(struct iio_dev *indio_dev);
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#endif /* _MS5611_H */
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