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