1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.h b/drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.h
new file mode 100644
index 000000000000..e047871cdbe2
--- /dev/null
+++ b/drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.h
@@ -0,0 +1,101 @@
+/* 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