name : inv_sensors_timestamp.h /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2020 Invensense, Inc. */ #ifndef INV_SENSORS_TIMESTAMP_H_ #define INV_SENSORS_TIMESTAMP_H_ /** * struct inv_sensors_timestamp_chip - chip internal properties * @clock_period: internal clock period in ns * @jitter: acceptable jitter in per-mille * @init_period: chip initial period at reset in ns */ struct inv_sensors_timestamp_chip { uint32_t clock_period; uint32_t jitter; uint32_t init_period; }; /** * struct inv_sensors_timestamp_interval - timestamps interval * @lo: interval lower bound * @up: interval upper bound */ struct inv_sensors_timestamp_interval { int64_t lo; int64_t up; }; /** * struct inv_sensors_timestamp_acc - accumulator for computing an estimation * @val: current estimation of the value, the mean of all values * @idx: current index of the next free place in values table * @values: table of all measured values, use for computing the mean */ struct inv_sensors_timestamp_acc { uint32_t val; size_t idx; uint32_t values[32]; }; /** * struct inv_sensors_timestamp - timestamp management states * @chip: chip internal characteristics * @min_period: minimal acceptable clock period * @max_period: maximal acceptable clock period * @it: interrupts interval timestamps * @timestamp: store last timestamp for computing next data timestamp * @mult: current internal period multiplier * @new_mult: new set internal period multiplier (not yet effective) * @period: measured current period of the sensor * @chip_period: accumulator for computing internal chip period */ struct inv_sensors_timestamp { struct inv_sensors_timestamp_chip chip; uint32_t min_period; uint32_t max_period; struct inv_sensors_timestamp_interval it; int64_t timestamp; uint32_t mult; uint32_t new_mult; uint32_t period; struct inv_sensors_timestamp_acc chip_period; }; void inv_sensors_timestamp_init(struct inv_sensors_timestamp *ts, const struct inv_sensors_timestamp_chip *chip); int inv_sensors_timestamp_update_odr(struct inv_sensors_timestamp *ts, uint32_t period, bool fifo); void inv_sensors_timestamp_interrupt(struct inv_sensors_timestamp *ts, uint32_t fifo_period, size_t fifo_nb, size_t sensor_nb, int64_t timestamp); static inline int64_t inv_sensors_timestamp_pop(struct inv_sensors_timestamp *ts) { ts->timestamp += ts->period; return ts->timestamp; } void inv_sensors_timestamp_apply_odr(struct inv_sensors_timestamp *ts, uint32_t fifo_period, size_t fifo_nb, unsigned int fifo_no); static inline void inv_sensors_timestamp_reset(struct inv_sensors_timestamp *ts) { const struct inv_sensors_timestamp_interval interval_init = {0LL, 0LL}; ts->it = interval_init; ts->timestamp = 0; } #endif