1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2020 Invensense, Inc. 4 */ 5 6 #ifndef INV_ICM42600_BUFFER_H_ 7 #define INV_ICM42600_BUFFER_H_ 8 9 #include <linux/kernel.h> 10 #include <linux/bits.h> 11 12 struct inv_icm42600_state; 13 14 #define INV_ICM42600_SENSOR_GYRO BIT(0) 15 #define INV_ICM42600_SENSOR_ACCEL BIT(1) 16 #define INV_ICM42600_SENSOR_TEMP BIT(2) 17 18 /** 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). 27 */ 28 struct inv_icm42600_fifo { 29 unsigned int on; 30 unsigned int en; 31 uint32_t period; 32 struct { 33 unsigned int gyro; 34 unsigned int accel; 35 } watermark; 36 size_t count; 37 struct { 38 size_t gyro; 39 size_t accel; 40 size_t total; 41 } nb; 42 uint8_t data[2080] __aligned(IIO_DMA_MINALIGN); 43 }; 44 45 /* FIFO data packet */ 46 struct inv_icm42600_fifo_sensor_data { 47 __be16 x; 48 __be16 y; 49 __be16 z; 50 } __packed; 51 #define INV_ICM42600_FIFO_DATA_INVALID -32768 52 53 static inline int16_t inv_icm42600_fifo_get_sensor_data(__be16 d) 54 { 55 return be16_to_cpu(d); 56 } 57 58 static inline bool 59 inv_icm42600_fifo_is_data_valid(const struct inv_icm42600_fifo_sensor_data *s) 60 { 61 int16_t x, y, z; 62 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); 66 67 if (x == INV_ICM42600_FIFO_DATA_INVALID && 68 y == INV_ICM42600_FIFO_DATA_INVALID && 69 z == INV_ICM42600_FIFO_DATA_INVALID) 70 return false; 71 72 return true; 73 } 74 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); 78 79 extern const struct iio_buffer_setup_ops inv_icm42600_buffer_ops; 80 81 int inv_icm42600_buffer_init(struct inv_icm42600_state *st); 82 83 void inv_icm42600_buffer_update_fifo_period(struct inv_icm42600_state *st); 84 85 int inv_icm42600_buffer_set_fifo_en(struct inv_icm42600_state *st, 86 unsigned int fifo_en); 87 88 int inv_icm42600_buffer_update_watermark(struct inv_icm42600_state *st); 89 90 int inv_icm42600_buffer_fifo_read(struct inv_icm42600_state *st, 91 unsigned int max); 92 93 int inv_icm42600_buffer_fifo_parse(struct inv_icm42600_state *st); 94 95 int inv_icm42600_buffer_hwfifo_flush(struct inv_icm42600_state *st, 96 unsigned int count); 97 98 #endif 99