1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2020 Invensense, Inc.
6 #ifndef INV_ICM42600_BUFFER_H_
7 #define INV_ICM42600_BUFFER_H_
9 #include <linux/kernel.h>
10 #include <linux/bits.h>
12 struct inv_icm42600_state;
14 #define INV_ICM42600_SENSOR_GYRO BIT(0)
15 #define INV_ICM42600_SENSOR_ACCEL BIT(1)
16 #define INV_ICM42600_SENSOR_TEMP BIT(2)
19 * struct inv_icm42600_fifo - FIFO state variables
20 * @on: reference counter for FIFO on.
21 * @en: bits field of INV_ICM42600_SENSOR_* for FIFO EN bits.
22 * @period: FIFO internal period.
23 * @watermark: watermark configuration values for accel and gyro.
24 * @count: number of bytes in the FIFO data buffer.
25 * @nb: gyro, accel and total samples in the FIFO data buffer.
26 * @data: FIFO data buffer aligned for DMA (2kB + 32 bytes of read cache).
28 struct inv_icm42600_fifo {
42 uint8_t data[2080] __aligned(IIO_DMA_MINALIGN);
45 /* FIFO data packet */
46 struct inv_icm42600_fifo_sensor_data {
51 #define INV_ICM42600_FIFO_DATA_INVALID -32768
53 static inline int16_t inv_icm42600_fifo_get_sensor_data(__be16 d)
55 return be16_to_cpu(d);
59 inv_icm42600_fifo_is_data_valid(const struct inv_icm42600_fifo_sensor_data *s)
63 x = inv_icm42600_fifo_get_sensor_data(s->x);
64 y = inv_icm42600_fifo_get_sensor_data(s->y);
65 z = inv_icm42600_fifo_get_sensor_data(s->z);
67 if (x == INV_ICM42600_FIFO_DATA_INVALID &&
68 y == INV_ICM42600_FIFO_DATA_INVALID &&
69 z == INV_ICM42600_FIFO_DATA_INVALID)
75 ssize_t inv_icm42600_fifo_decode_packet(const void *packet, const void **accel,
76 const void **gyro, const int8_t **temp,
77 const void **timestamp, unsigned int *odr);
79 extern const struct iio_buffer_setup_ops inv_icm42600_buffer_ops;
81 int inv_icm42600_buffer_init(struct inv_icm42600_state *st);
83 void inv_icm42600_buffer_update_fifo_period(struct inv_icm42600_state *st);
85 int inv_icm42600_buffer_set_fifo_en(struct inv_icm42600_state *st,
86 unsigned int fifo_en);
88 int inv_icm42600_buffer_update_watermark(struct inv_icm42600_state *st);
90 int inv_icm42600_buffer_fifo_read(struct inv_icm42600_state *st,
93 int inv_icm42600_buffer_fifo_parse(struct inv_icm42600_state *st);
95 int inv_icm42600_buffer_hwfifo_flush(struct inv_icm42600_state *st,