73 lines · c
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 100034#define SSP_INVERTED_SCALING_FACTOR 1000000U35 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((u64)SSP_FACTOR_WITH_MS, value);71}72#endif /* __SSP_IIO_SENSOR_H__ */73