xref: /openbmc/linux/drivers/iio/pressure/ms5611.h (revision caa6693e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * MS5611 pressure and temperature sensor driver
4  *
5  * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
6  *
7  */
8 
9 #ifndef _MS5611_H
10 #define _MS5611_H
11 
12 #include <linux/device.h>
13 #include <linux/iio/iio.h>
14 #include <linux/mutex.h>
15 
16 #define MS5611_RESET			0x1e
17 #define MS5611_READ_ADC			0x00
18 #define MS5611_READ_PROM_WORD		0xA0
19 #define MS5611_PROM_WORDS_NB		8
20 
21 enum {
22 	MS5611,
23 	MS5607,
24 };
25 
26 /*
27  * OverSampling Rate descriptor.
28  * Warning: cmd MUST be kept aligned on a word boundary (see
29  * m5611_spi_read_adc_temp_and_pressure in ms5611_spi.c).
30  */
31 struct ms5611_osr {
32 	unsigned long conv_usec;
33 	u8 cmd;
34 	unsigned short rate;
35 };
36 
37 struct ms5611_state {
38 	void *client;
39 	struct mutex lock;
40 
41 	const struct ms5611_osr *pressure_osr;
42 	const struct ms5611_osr *temp_osr;
43 
44 	u16 prom[MS5611_PROM_WORDS_NB];
45 
46 	int (*reset)(struct ms5611_state *st);
47 	int (*read_prom_word)(struct ms5611_state *st, int index, u16 *word);
48 	int (*read_adc_temp_and_pressure)(struct ms5611_state *st,
49 					  s32 *temp, s32 *pressure);
50 
51 	int (*compensate_temp_and_pressure)(struct ms5611_state *st, s32 *temp,
52 					  s32 *pressure);
53 };
54 
55 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
56 		 const char *name, int type);
57 
58 #endif /* _MS5611_H */
59