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-rw-r--r--drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.h b/drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.h
new file mode 100644
index 000000000..4e4f331d4
--- /dev/null
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020 Invensense, Inc.
+ */
+
+#ifndef INV_ICM42600_TIMESTAMP_H_
+#define INV_ICM42600_TIMESTAMP_H_
+
+#include <linux/kernel.h>
+
+struct inv_icm42600_state;
+
+/**
+ * struct inv_icm42600_timestamp_interval - timestamps interval
+ * @lo: interval lower bound
+ * @up: interval upper bound
+ */
+struct inv_icm42600_timestamp_interval {
+ int64_t lo;
+ int64_t up;
+};
+
+/**
+ * struct inv_icm42600_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_icm42600_timestamp_acc {
+ uint32_t val;
+ size_t idx;
+ uint32_t values[32];
+};
+
+/**
+ * struct inv_icm42600_timestamp - timestamp management states
+ * @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_icm42600_timestamp {
+ struct inv_icm42600_timestamp_interval it;
+ int64_t timestamp;
+ uint32_t mult;
+ uint32_t new_mult;
+ uint32_t period;
+ struct inv_icm42600_timestamp_acc chip_period;
+};
+
+void inv_icm42600_timestamp_init(struct inv_icm42600_timestamp *ts,
+ uint32_t period);
+
+int inv_icm42600_timestamp_setup(struct inv_icm42600_state *st);
+
+int inv_icm42600_timestamp_update_odr(struct inv_icm42600_timestamp *ts,
+ uint32_t period, bool fifo);
+
+void inv_icm42600_timestamp_interrupt(struct inv_icm42600_timestamp *ts,
+ uint32_t fifo_period, size_t fifo_nb,
+ size_t sensor_nb, int64_t timestamp);
+
+static inline int64_t
+inv_icm42600_timestamp_pop(struct inv_icm42600_timestamp *ts)
+{
+ ts->timestamp += ts->period;
+ return ts->timestamp;
+}
+
+void inv_icm42600_timestamp_apply_odr(struct inv_icm42600_timestamp *ts,
+ uint32_t fifo_period, size_t fifo_nb,
+ unsigned int fifo_no);
+
+static inline void
+inv_icm42600_timestamp_reset(struct inv_icm42600_timestamp *ts)
+{
+ const struct inv_icm42600_timestamp_interval interval_init = {0LL, 0LL};
+
+ ts->it = interval_init;
+ ts->timestamp = 0;
+}
+
+#endif