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98 lines
2.5 KiB
98 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) 2020 Invensense, Inc. |
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*/ |
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#ifndef INV_ICM42600_BUFFER_H_ |
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#define INV_ICM42600_BUFFER_H_ |
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#include <linux/kernel.h> |
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#include <linux/bits.h> |
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struct inv_icm42600_state; |
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#define INV_ICM42600_SENSOR_GYRO BIT(0) |
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#define INV_ICM42600_SENSOR_ACCEL BIT(1) |
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#define INV_ICM42600_SENSOR_TEMP BIT(2) |
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/** |
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* struct inv_icm42600_fifo - FIFO state variables |
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* @on: reference counter for FIFO on. |
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* @en: bits field of INV_ICM42600_SENSOR_* for FIFO EN bits. |
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* @period: FIFO internal period. |
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* @watermark: watermark configuration values for accel and gyro. |
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* @count: number of bytes in the FIFO data buffer. |
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* @nb: gyro, accel and total samples in the FIFO data buffer. |
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* @data: FIFO data buffer aligned for DMA (2kB + 32 bytes of read cache). |
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*/ |
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struct inv_icm42600_fifo { |
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unsigned int on; |
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unsigned int en; |
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uint32_t period; |
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struct { |
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unsigned int gyro; |
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unsigned int accel; |
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} watermark; |
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size_t count; |
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struct { |
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size_t gyro; |
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size_t accel; |
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size_t total; |
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} nb; |
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uint8_t data[2080] __aligned(IIO_DMA_MINALIGN); |
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}; |
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/* FIFO data packet */ |
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struct inv_icm42600_fifo_sensor_data { |
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__be16 x; |
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__be16 y; |
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__be16 z; |
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} __packed; |
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#define INV_ICM42600_FIFO_DATA_INVALID -32768 |
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static inline int16_t inv_icm42600_fifo_get_sensor_data(__be16 d) |
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{ |
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return be16_to_cpu(d); |
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} |
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static inline bool |
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inv_icm42600_fifo_is_data_valid(const struct inv_icm42600_fifo_sensor_data *s) |
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{ |
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int16_t x, y, z; |
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x = inv_icm42600_fifo_get_sensor_data(s->x); |
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y = inv_icm42600_fifo_get_sensor_data(s->y); |
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z = inv_icm42600_fifo_get_sensor_data(s->z); |
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if (x == INV_ICM42600_FIFO_DATA_INVALID && |
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y == INV_ICM42600_FIFO_DATA_INVALID && |
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z == INV_ICM42600_FIFO_DATA_INVALID) |
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return false; |
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return true; |
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} |
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ssize_t inv_icm42600_fifo_decode_packet(const void *packet, const void **accel, |
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const void **gyro, const int8_t **temp, |
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const void **timestamp, unsigned int *odr); |
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extern const struct iio_buffer_setup_ops inv_icm42600_buffer_ops; |
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int inv_icm42600_buffer_init(struct inv_icm42600_state *st); |
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void inv_icm42600_buffer_update_fifo_period(struct inv_icm42600_state *st); |
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int inv_icm42600_buffer_set_fifo_en(struct inv_icm42600_state *st, |
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unsigned int fifo_en); |
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int inv_icm42600_buffer_update_watermark(struct inv_icm42600_state *st); |
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int inv_icm42600_buffer_fifo_read(struct inv_icm42600_state *st, |
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unsigned int max); |
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int inv_icm42600_buffer_fifo_parse(struct inv_icm42600_state *st); |
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int inv_icm42600_buffer_hwfifo_flush(struct inv_icm42600_state *st, |
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unsigned int count); |
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#endif
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