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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 NANOHZ_PER_HZ 1000000000UL
- #define MICROHZ_PER_HZ 1000000UL
- #define MILLIHZ_PER_HZ 1000UL
- #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 */
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