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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
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