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