1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __SSP_IIO_SENSOR_H__
3#define __SSP_IIO_SENSOR_H__
4
5#define SSP_CHANNEL_AG(_type, _mod, _index) \
6{ \
7 .type = _type,\
8 .modified = 1,\
9 .channel2 = _mod,\
10 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
11 .scan_index = _index,\
12 .scan_type = {\
13 .sign = 's',\
14 .realbits = 16,\
15 .storagebits = 16,\
16 .shift = 0,\
17 .endianness = IIO_LE,\
18 },\
19}
20
21/* It is defined here as it is a mixed timestamp */
22#define SSP_CHAN_TIMESTAMP(_si) { \
23 .type = IIO_TIMESTAMP, \
24 .channel = -1, \
25 .scan_index = _si, \
26 .scan_type = { \
27 .sign = 's', \
28 .realbits = 64, \
29 .storagebits = 64, \
30 }, \
31}
32
33#define SSP_MS_PER_S 1000
34#define SSP_INVERTED_SCALING_FACTOR 1000000U
35
36#define SSP_FACTOR_WITH_MS \
37 (SSP_INVERTED_SCALING_FACTOR * SSP_MS_PER_S)
38
39int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
40
41int ssp_common_buffer_postdisable(struct iio_dev *indio_dev);
42
43int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
44 unsigned int len, int64_t timestamp);
45
46/* Converts time in ms to frequency */
47static inline void ssp_convert_to_freq(u32 time, int *integer_part,
48 int *fractional)
49{
50 if (time == 0) {
51 *fractional = 0;
52 *integer_part = 0;
53 return;
54 }
55
56 *integer_part = SSP_FACTOR_WITH_MS / time;
57 *fractional = *integer_part % SSP_INVERTED_SCALING_FACTOR;
58 *integer_part = *integer_part / SSP_INVERTED_SCALING_FACTOR;
59}
60
61/* Converts frequency to time in ms */
62static inline int ssp_convert_to_time(int integer_part, int fractional)
63{
64 u64 value;
65
66 value = (u64)integer_part * SSP_INVERTED_SCALING_FACTOR + fractional;
67 if (value == 0)
68 return 0;
69
70 return div64_u64(dividend: (u64)SSP_FACTOR_WITH_MS, divisor: value);
71}
72#endif /* __SSP_IIO_SENSOR_H__ */
73

source code of linux/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h