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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_UNITS_H#define _LINUX_UNITS_H
#include <linux/bits.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
/* * Percentage and related scaling units * * These macros define scaling factors used to convert between ratio and * percentage-based representations with different decimal resolutions. * They are used for precise fractional calculations in engineering, finance, * and measurement applications. * * Examples: * 1% = 0.01 = 1 / PERCENT * 0.1% = 0.001 = 1 / PERMILLE * 0.01% = 0.0001 = 1 / PERMYRIAD (1 basis point) * 0.001% = 0.00001 = 1 / PERCENTMILLE */#define PERCENT 100#define PERMILLE 1000#define PERMYRIAD 10000#define PERCENTMILLE 100000
#define NANOHZ_PER_HZ 1000000000UL#define MICROHZ_PER_HZ 1000000UL#define MILLIHZ_PER_HZ 1000UL
/* Hz based multipliers */#define HZ_PER_KHZ 1000UL#define HZ_PER_MHZ 1000000UL#define HZ_PER_GHZ 1000000000UL
/* kHz based multipliers */#define KHZ_PER_MHZ 1000UL#define KHZ_PER_GHZ 1000000UL
#define MILLIWATT_PER_WATT 1000UL#define MICROWATT_PER_MILLIWATT 1000UL#define MICROWATT_PER_WATT 1000000UL
#define MICROJOULE_PER_JOULE 1000000UL#define NANOJOULE_PER_JOULE 1000000000UL
#define BYTES_PER_KBIT (KILO / BITS_PER_BYTE)#define BYTES_PER_MBIT (MEGA / BITS_PER_BYTE)#define BYTES_PER_GBIT (GIGA / BITS_PER_BYTE)
#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 */