/* 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