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lib: add generic polynomial calculation

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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>
This commit is contained in:
Michael Walle 2022-04-01 23:40:29 +02:00 • committed by Guenter Roeck
parent 9054416afc
commit cd705ea857
4 changed files with 148 additions and 0 deletions
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35
include/linux/polynomial.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
*/
#ifndef _POLYNOMIAL_H
#define _POLYNOMIAL_H
/*
* struct polynomial_term - one term descriptor of a polynomial
* @deg: degree of the term.
* @coef: multiplication factor of the term.
* @divider: distributed divider per each degree.
* @divider_leftover: divider leftover, which couldn't be redistributed.
*/
struct polynomial_term {
unsigned int deg;
long coef;
long divider;
long divider_leftover;
};
/*
* struct polynomial - a polynomial descriptor
* @total_divider: total data divider.
* @terms: polynomial terms, last term must have degree of 0
*/
struct polynomial {
long total_divider;
struct polynomial_term terms[];
};
long polynomial_calc(const struct polynomial *poly, long data);
#endif