/* 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; 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 * @chan.pres: pressure value * @chan.ts: timestamp * @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 { s32 pres; aligned_s64 ts; } 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