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05f5d78834
Add triggered buffer feature. Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro> Link: https://lore.kernel.org/r/20240211075645.28777-7-petre.rodan@subdimension.ro Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Honeywell TruStability HSC Series pressure/temperature sensor
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*
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* Copyright (c) 2023 Petre Rodan <petre.rodan@subdimension.ro>
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*/
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#ifndef _HSC030PA_H
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#define _HSC030PA_H
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#include <linux/types.h>
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#include <linux/iio/iio.h>
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#define HSC_REG_MEASUREMENT_RD_SIZE 4
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#define HSC_RESP_TIME_MS 2
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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 hsc_data;
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struct hsc_chip_data;
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typedef int (*hsc_recv_fn)(struct hsc_data *);
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/**
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* struct hsc_data
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* @dev: current device structure
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* @chip: structure containing chip's channel properties
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* @recv_cb: function that implements the chip reads
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* @is_valid: true if last transfer has been validated
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* @pmin: minimum measurable pressure limit
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* @pmax: maximum measurable pressure limit
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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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* @function: transfer function
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* @p_scale: pressure scale
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* @p_scale_dec: pressure scale, decimal places
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* @p_offset: pressure offset
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* @p_offset_dec: pressure offset, decimal places
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* @buffer: raw conversion data
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*/
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struct hsc_data {
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struct device *dev;
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const struct hsc_chip_data *chip;
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hsc_recv_fn recv_cb;
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bool is_valid;
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s32 pmin;
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s32 pmax;
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u32 outmin;
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u32 outmax;
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u32 function;
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s64 p_scale;
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s32 p_scale_dec;
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s64 p_offset;
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s32 p_offset_dec;
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struct {
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__be16 chan[2];
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s64 timestamp __aligned(8);
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} scan;
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u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
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};
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struct hsc_chip_data {
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bool (*valid)(struct hsc_data *data);
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const struct iio_chan_spec *channels;
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u8 num_channels;
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};
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enum hsc_func_id {
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HSC_FUNCTION_A,
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HSC_FUNCTION_B,
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HSC_FUNCTION_C,
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HSC_FUNCTION_F,
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};
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int hsc_common_probe(struct device *dev, hsc_recv_fn recv);
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#endif
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