inv_icm45600_buffer.h

  1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/* Copyright (C) 2025 Invensense, Inc. */
  3
  4#ifndef INV_ICM45600_BUFFER_H_
  5#define INV_ICM45600_BUFFER_H_
  6
  7#include <linux/bits.h>
  8#include <linux/limits.h>
  9#include <linux/types.h>
 10
 11#include <asm/byteorder.h>
 12
 13#include <linux/iio/iio.h>
 14
 15struct inv_icm45600_state;
 16
 17#define INV_ICM45600_SENSOR_GYRO	BIT(0)
 18#define INV_ICM45600_SENSOR_ACCEL	BIT(1)
 19#define INV_ICM45600_SENSOR_TEMP	BIT(2)
 20
 21/**
 22 * struct inv_icm45600_fifo - FIFO state variables
 23 * @on:		reference counter for FIFO on.
 24 * @en:		bits field of INV_ICM45600_SENSOR_* for FIFO EN bits.
 25 * @period:	FIFO internal period.
 26 * @watermark:	watermark configuration values for accel and gyro.
 27 * @watermark.gyro:	 requested watermark for gyro.
 28 * @watermark.accel:	 requested watermark for accel.
 29 * @watermark.eff_gyro:	 effective watermark for gyro.
 30 * @watermark.eff_accel: effective watermark for accel.
 31 * @count:	number of bytes in the FIFO data buffer.
 32 * @nb:		gyro, accel and total samples in the FIFO data buffer.
 33 * @data:	FIFO data buffer aligned for DMA (8kB)
 34 */
 35struct inv_icm45600_fifo {
 36	unsigned int on;
 37	unsigned int en;
 38	u32 period;
 39	struct {
 40		unsigned int gyro;
 41		unsigned int accel;
 42		unsigned int eff_gyro;
 43		unsigned int eff_accel;
 44	} watermark;
 45	size_t count;
 46	struct {
 47		size_t gyro;
 48		size_t accel;
 49		size_t total;
 50	} nb;
 51	u8 *data;
 52};
 53
 54/* FIFO data packet */
 55struct inv_icm45600_fifo_sensor_data {
 56	__le16 x;
 57	__le16 y;
 58	__le16 z;
 59} __packed;
 60#define INV_ICM45600_DATA_INVALID		S16_MIN
 61
 62static inline bool
 63inv_icm45600_fifo_is_data_valid(const struct inv_icm45600_fifo_sensor_data *s)
 64{
 65	s16 x, y, z;
 66
 67	x = le16_to_cpu(s->x);
 68	y = le16_to_cpu(s->y);
 69	z = le16_to_cpu(s->z);
 70
 71	return (x != INV_ICM45600_DATA_INVALID ||
 72		y != INV_ICM45600_DATA_INVALID ||
 73		z != INV_ICM45600_DATA_INVALID);
 74}
 75
 76ssize_t inv_icm45600_fifo_decode_packet(const void *packet,
 77					const struct inv_icm45600_fifo_sensor_data **accel,
 78					const struct inv_icm45600_fifo_sensor_data **gyro,
 79					const s8 **temp,
 80					const __le16 **timestamp, unsigned int *odr);
 81
 82extern const struct iio_buffer_setup_ops inv_icm45600_buffer_ops;
 83
 84int inv_icm45600_buffer_init(struct inv_icm45600_state *st);
 85
 86void inv_icm45600_buffer_update_fifo_period(struct inv_icm45600_state *st);
 87
 88int inv_icm45600_buffer_set_fifo_en(struct inv_icm45600_state *st,
 89				    unsigned int fifo_en);
 90
 91int inv_icm45600_buffer_update_watermark(struct inv_icm45600_state *st);
 92
 93int inv_icm45600_buffer_fifo_read(struct inv_icm45600_state *st,
 94				  unsigned int max);
 95
 96int inv_icm45600_buffer_fifo_parse(struct inv_icm45600_state *st);
 97
 98int inv_icm45600_buffer_hwfifo_flush(struct inv_icm45600_state *st,
 99				     unsigned int count);
100
101#endif