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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2025 Invensense, Inc. */
#ifndef INV_ICM45600_BUFFER_H_
#define INV_ICM45600_BUFFER_H_
#include <linux/bits.h>
#include <linux/limits.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/iio/iio.h>
struct inv_icm45600_state;
#define INV_ICM45600_SENSOR_GYRO BIT(0)
#define INV_ICM45600_SENSOR_ACCEL BIT(1)
#define INV_ICM45600_SENSOR_TEMP BIT(2)
/**
* struct inv_icm45600_fifo - FIFO state variables
* @on: reference counter for FIFO on.
* @en: bits field of INV_ICM45600_SENSOR_* for FIFO EN bits.
* @period: FIFO internal period.
* @watermark: watermark configuration values for accel and gyro.
* @watermark.gyro: requested watermark for gyro.
* @watermark.accel: requested watermark for accel.
* @watermark.eff_gyro: effective watermark for gyro.
* @watermark.eff_accel: effective watermark for accel.
* @count: number of bytes in the FIFO data buffer.
* @nb: gyro, accel and total samples in the FIFO data buffer.
* @data: FIFO data buffer aligned for DMA (8kB)
*/
struct inv_icm45600_fifo {
unsigned int on;
unsigned int en;
u32 period;
struct {
unsigned int gyro;
unsigned int accel;
unsigned int eff_gyro;
unsigned int eff_accel;
} watermark;
size_t count;
struct {
size_t gyro;
size_t accel;
size_t total;
} nb;
u8 *data;
};
/* FIFO data packet */
struct inv_icm45600_fifo_sensor_data {
__le16 x;
__le16 y;
__le16 z;
} __packed;
#define INV_ICM45600_DATA_INVALID S16_MIN
static inline bool
inv_icm45600_fifo_is_data_valid(const struct inv_icm45600_fifo_sensor_data *s)
{
s16 x, y, z;
x = le16_to_cpu(s->x);
y = le16_to_cpu(s->y);
z = le16_to_cpu(s->z);
return (x != INV_ICM45600_DATA_INVALID ||
y != INV_ICM45600_DATA_INVALID ||
z != INV_ICM45600_DATA_INVALID);
}
ssize_t inv_icm45600_fifo_decode_packet(const void *packet,
const struct inv_icm45600_fifo_sensor_data **accel,
const struct inv_icm45600_fifo_sensor_data **gyro,
const s8 **temp,
const __le16 **timestamp, unsigned int *odr);
extern const struct iio_buffer_setup_ops inv_icm45600_buffer_ops;
int inv_icm45600_buffer_init(struct inv_icm45600_state *st);
void inv_icm45600_buffer_update_fifo_period(struct inv_icm45600_state *st);
int inv_icm45600_buffer_set_fifo_en(struct inv_icm45600_state *st,
unsigned int fifo_en);
int inv_icm45600_buffer_update_watermark(struct inv_icm45600_state *st);
int inv_icm45600_buffer_fifo_read(struct inv_icm45600_state *st,
unsigned int max);
int inv_icm45600_buffer_fifo_parse(struct inv_icm45600_state *st);
int inv_icm45600_buffer_hwfifo_flush(struct inv_icm45600_state *st,
unsigned int count);
#endif
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