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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Honeywell TruStability HSC Series pressure/temperature sensor
*
* Copyright (c) 2023 Petre Rodan <petre.rodan@subdimension.ro>
*/
#ifndef _HSC030PA_H
#define _HSC030PA_H
#include <linux/types.h>
#include <linux/iio/iio.h>
#define HSC_REG_MEASUREMENT_RD_SIZE 4
#define HSC_RESP_TIME_MS 2
struct device;
struct iio_chan_spec;
struct iio_dev;
struct hsc_data;
struct hsc_chip_data;
typedef int (*hsc_recv_fn)(struct hsc_data *);
/**
* struct hsc_data
* @dev: current device structure
* @chip: structure containing chip's channel properties
* @recv_cb: function that implements the chip reads
* @is_valid: true if last transfer has been validated
* @pmin: minimum measurable pressure limit
* @pmax: maximum measurable pressure limit
* @outmin: minimum raw pressure in counts (based on transfer function)
* @outmax: maximum raw pressure in counts (based on transfer function)
* @function: transfer function
* @p_scale: pressure scale
* @p_scale_dec: pressure scale, decimal places
* @p_offset: pressure offset
* @p_offset_dec: pressure offset, decimal places
* @buffer: raw conversion data
*/
struct hsc_data {
struct device *dev;
const struct hsc_chip_data *chip;
hsc_recv_fn recv_cb;
bool is_valid;
s32 pmin;
s32 pmax;
u32 outmin;
u32 outmax;
u32 function;
s64 p_scale;
s32 p_scale_dec;
s64 p_offset;
s32 p_offset_dec;
struct {
__be16 chan[2];
s64 timestamp __aligned(8);
} scan;
u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
};
struct hsc_chip_data {
bool (*valid)(struct hsc_data *data);
const struct iio_chan_spec *channels;
u8 num_channels;
};
enum hsc_func_id {
HSC_FUNCTION_A,
HSC_FUNCTION_B,
HSC_FUNCTION_C,
HSC_FUNCTION_F,
};
int hsc_common_probe(struct device *dev, hsc_recv_fn recv);
#endif
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