112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UNITS_H
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#define _LINUX_UNITS_H
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#include <linux/math.h>
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/* Metric prefixes in accordance with Système international (d'unités) */
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#define PETA 1000000000000000ULL
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#define TERA 1000000000000ULL
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#define GIGA 1000000000UL
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#define MEGA 1000000UL
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#define KILO 1000UL
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#define HECTO 100UL
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#define DECA 10UL
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#define DECI 10UL
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#define CENTI 100UL
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#define MILLI 1000UL
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#define MICRO 1000000UL
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#define NANO 1000000000UL
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#define PICO 1000000000000ULL
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#define FEMTO 1000000000000000ULL
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#define NANOHZ_PER_HZ 1000000000UL
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#define MICROHZ_PER_HZ 1000000UL
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#define MILLIHZ_PER_HZ 1000UL
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#define HZ_PER_KHZ 1000UL
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#define KHZ_PER_MHZ 1000UL
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#define HZ_PER_MHZ 1000000UL
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#define MILLIWATT_PER_WATT 1000UL
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#define MICROWATT_PER_MILLIWATT 1000UL
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#define MICROWATT_PER_WATT 1000000UL
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#define ABSOLUTE_ZERO_MILLICELSIUS -273150
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static inline long milli_kelvin_to_millicelsius(long t)
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{
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return t + ABSOLUTE_ZERO_MILLICELSIUS;
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}
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static inline long millicelsius_to_milli_kelvin(long t)
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{
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return t - ABSOLUTE_ZERO_MILLICELSIUS;
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}
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#define MILLIDEGREE_PER_DEGREE 1000
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#define MILLIDEGREE_PER_DECIDEGREE 100
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static inline long kelvin_to_millicelsius(long t)
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{
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return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
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}
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static inline long millicelsius_to_kelvin(long t)
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{
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t = millicelsius_to_milli_kelvin(t);
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
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}
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static inline long deci_kelvin_to_celsius(long t)
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{
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t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
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}
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static inline long celsius_to_deci_kelvin(long t)
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{
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t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
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}
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/**
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* deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
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* @t: temperature value in decidegrees Kelvin
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* @offset: difference between Kelvin and Celsius in millidegrees
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*
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* Return: temperature value in millidegrees Celsius
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*/
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static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
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{
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return t * MILLIDEGREE_PER_DECIDEGREE - offset;
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}
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static inline long deci_kelvin_to_millicelsius(long t)
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{
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return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
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}
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static inline long millicelsius_to_deci_kelvin(long t)
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{
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t = millicelsius_to_milli_kelvin(t);
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
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}
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static inline long kelvin_to_celsius(long t)
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{
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return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
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MILLIDEGREE_PER_DEGREE);
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}
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static inline long celsius_to_kelvin(long t)
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{
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return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
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MILLIDEGREE_PER_DEGREE);
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}
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#endif /* _LINUX_UNITS_H */
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