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-rw-r--r--drivers/iio/pressure/mprls0025pa.h102
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diff --git a/drivers/iio/pressure/mprls0025pa.h b/drivers/iio/pressure/mprls0025pa.h
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+++ b/drivers/iio/pressure/mprls0025pa.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver
+ *
+ * Copyright (c) Andreas Klinger <ak@it-klinger.de>
+ *
+ * Data sheet:
+ * https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/micropressure-mpr-series/documents/sps-siot-mpr-series-datasheet-32332628-ciid-172626.pdf
+ */
+
+#ifndef _MPRLS0025PA_H
+#define _MPRLS0025PA_H
+
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+
+#include <linux/iio/iio.h>
+
+#define MPR_MEASUREMENT_RD_SIZE 4
+#define MPR_CMD_NOP 0xf0
+#define MPR_CMD_SYNC 0xaa
+#define MPR_PKT_NOP_LEN MPR_MEASUREMENT_RD_SIZE
+#define MPR_PKT_SYNC_LEN 3
+
+struct device;
+
+struct iio_chan_spec;
+struct iio_dev;
+
+struct mpr_data;
+struct mpr_ops;
+
+/**
+ * struct mpr_chan
+ * @pres: pressure value
+ * @ts: timestamp
+ */
+struct mpr_chan {
+ s32 pres;
+ s64 ts;
+};
+
+enum mpr_func_id {
+ MPR_FUNCTION_A,
+ MPR_FUNCTION_B,
+ MPR_FUNCTION_C,
+};
+
+/**
+ * struct mpr_data
+ * @dev: current device structure
+ * @ops: functions that implement the sensor reads/writes, bus init
+ * @lock: access to device during read
+ * @pmin: minimal pressure in pascal
+ * @pmax: maximal pressure in pascal
+ * @function: transfer function
+ * @outmin: minimum raw pressure in counts (based on transfer function)
+ * @outmax: maximum raw pressure in counts (based on transfer function)
+ * @scale: pressure scale
+ * @scale2: pressure scale, decimal number
+ * @offset: pressure offset
+ * @offset2: pressure offset, decimal number
+ * @gpiod_reset: reset
+ * @irq: end of conversion irq. used to distinguish between irq mode and
+ * reading in a loop until data is ready
+ * @completion: handshake from irq to read
+ * @chan: channel values for buffered mode
+ * @buffer: raw conversion data
+ */
+struct mpr_data {
+ struct device *dev;
+ const struct mpr_ops *ops;
+ struct mutex lock;
+ u32 pmin;
+ u32 pmax;
+ enum mpr_func_id function;
+ u32 outmin;
+ u32 outmax;
+ int scale;
+ int scale2;
+ int offset;
+ int offset2;
+ struct gpio_desc *gpiod_reset;
+ int irq;
+ struct completion completion;
+ struct mpr_chan chan;
+ u8 buffer[MPR_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
+};
+
+struct mpr_ops {
+ int (*init)(struct device *dev);
+ int (*read)(struct mpr_data *data, const u8 cmd, const u8 cnt);
+ int (*write)(struct mpr_data *data, const u8 cmd, const u8 cnt);
+};
+
+int mpr_common_probe(struct device *dev, const struct mpr_ops *ops, int irq);
+
+#endif