drivers/iio/pressure/ms5611.h

   1 /*
   2  * MS5611 pressure and temperature sensor driver
   3  *
   4  * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
   5  *
   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.
   9  *
  10  */
  11
  12 #ifndef _MS5611_H
  13 #define _MS5611_H
  14
  15 #include <linux/device.h>
  16 #include <linux/iio/iio.h>
  17 #include <linux/mutex.h>
  18
  19 struct regulator;
  20
  21 #define MS5611_RESET                    0x1e
  22 #define MS5611_READ_ADC                 0x00
  23 #define MS5611_READ_PROM_WORD           0xA0
  24 #define MS5611_PROM_WORDS_NB            8
  25
  26 enum {
  27         MS5611,
  28         MS5607,
  29 };
  30
  31 struct ms5611_chip_info {
  32         u16 prom[MS5611_PROM_WORDS_NB];
  33
  34         int (*temp_and_pressure_compensate)(struct ms5611_chip_info *chip_info,
  35                                             s32 *temp, s32 *pressure);
  36 };
  37
  38 /*
  39  * OverSampling Rate descriptor.
  40  * Warning: cmd MUST be kept aligned on a word boundary (see
  41  * m5611_spi_read_adc_temp_and_pressure in ms5611_spi.c).
  42  */
  43 struct ms5611_osr {
  44         unsigned long conv_usec;
  45         u8 cmd;
  46         unsigned short rate;
  47 };
  48
  49 struct ms5611_state {
  50         void *client;
  51         struct mutex lock;
  52
  53         const struct ms5611_osr *pressure_osr;
  54         const struct ms5611_osr *temp_osr;
  55
  56         int (*reset)(struct device *dev);
  57         int (*read_prom_word)(struct device *dev, int index, u16 *word);
  58         int (*read_adc_temp_and_pressure)(struct device *dev,
  59                                           s32 *temp, s32 *pressure);
  60
  61         struct ms5611_chip_info *chip_info;
  62         struct regulator *vdd;
  63 };
  64
  65 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
  66                  const char* name, int type);
  67 int ms5611_remove(struct iio_dev *indio_dev);
  68
  69 #endif /* _MS5611_H */