diff options
Diffstat (limited to 'include/linux/iio/common/inv_sensors_timestamp.h')
-rw-r--r-- | include/linux/iio/common/inv_sensors_timestamp.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/include/linux/iio/common/inv_sensors_timestamp.h b/include/linux/iio/common/inv_sensors_timestamp.h new file mode 100644 index 000000000000..a47d304d1ba7 --- /dev/null +++ b/include/linux/iio/common/inv_sensors_timestamp.h @@ -0,0 +1,95 @@ +/* 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 |