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cd705ea857
Some temperature and voltage sensors use a polynomial to convert between raw data points and actual temperature or voltage. The polynomial is usually the result of a curve fitting of the diode characteristic. The BT1 PVT hwmon driver already uses such a polynonmial calculation which is rather generic. Move it to lib/ so other drivers can reuse it. Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20220401214032.3738095-2-michael@walle.cc Signed-off-by: Guenter Roeck <linux@roeck-us.net>
35 lines
814 B
C
35 lines
814 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
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*/
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#ifndef _POLYNOMIAL_H
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#define _POLYNOMIAL_H
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/*
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* struct polynomial_term - one term descriptor of a polynomial
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* @deg: degree of the term.
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* @coef: multiplication factor of the term.
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* @divider: distributed divider per each degree.
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* @divider_leftover: divider leftover, which couldn't be redistributed.
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*/
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struct polynomial_term {
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unsigned int deg;
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long coef;
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long divider;
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long divider_leftover;
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};
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/*
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* struct polynomial - a polynomial descriptor
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* @total_divider: total data divider.
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* @terms: polynomial terms, last term must have degree of 0
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*/
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struct polynomial {
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long total_divider;
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struct polynomial_term terms[];
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};
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long polynomial_calc(const struct polynomial *poly, long data);
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#endif
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