123331e48SAkinobu Mita /* SPDX-License-Identifier: GPL-2.0 */ 223331e48SAkinobu Mita #ifndef _LINUX_UNITS_H 323331e48SAkinobu Mita #define _LINUX_UNITS_H 423331e48SAkinobu Mita 5aa6159abSAndy Shevchenko #include <linux/math.h> 623331e48SAkinobu Mita 726471d4aSAndy Shevchenko /* Metric prefixes in accordance with Système international (d'unités) */ 826471d4aSAndy Shevchenko #define PETA 1000000000000000ULL 926471d4aSAndy Shevchenko #define TERA 1000000000000ULL 1026471d4aSAndy Shevchenko #define GIGA 1000000000UL 1126471d4aSAndy Shevchenko #define MEGA 1000000UL 1226471d4aSAndy Shevchenko #define KILO 1000UL 1326471d4aSAndy Shevchenko #define HECTO 100UL 1426471d4aSAndy Shevchenko #define DECA 10UL 1526471d4aSAndy Shevchenko #define DECI 10UL 1626471d4aSAndy Shevchenko #define CENTI 100UL 1726471d4aSAndy Shevchenko #define MILLI 1000UL 1826471d4aSAndy Shevchenko #define MICRO 1000000UL 1926471d4aSAndy Shevchenko #define NANO 1000000000UL 2026471d4aSAndy Shevchenko #define PICO 1000000000000ULL 2126471d4aSAndy Shevchenko #define FEMTO 1000000000000000ULL 2226471d4aSAndy Shevchenko 23*d2a4cbcbSDmitry Rokosov #define NANOHZ_PER_HZ 1000000000UL 24*d2a4cbcbSDmitry Rokosov #define MICROHZ_PER_HZ 1000000UL 25*d2a4cbcbSDmitry Rokosov #define MILLIHZ_PER_HZ 1000UL 26e2c77032SDaniel Lezcano #define HZ_PER_KHZ 1000UL 27e2c77032SDaniel Lezcano #define KHZ_PER_MHZ 1000UL 28e2c77032SDaniel Lezcano #define HZ_PER_MHZ 1000000UL 29e2c77032SDaniel Lezcano 30c9221919SDaniel Lezcano #define MILLIWATT_PER_WATT 1000UL 31c9221919SDaniel Lezcano #define MICROWATT_PER_MILLIWATT 1000UL 32c9221919SDaniel Lezcano #define MICROWATT_PER_WATT 1000000UL 332ee5f8f0SDaniel Lezcano 3423331e48SAkinobu Mita #define ABSOLUTE_ZERO_MILLICELSIUS -273150 3523331e48SAkinobu Mita milli_kelvin_to_millicelsius(long t)3623331e48SAkinobu Mitastatic inline long milli_kelvin_to_millicelsius(long t) 3723331e48SAkinobu Mita { 3823331e48SAkinobu Mita return t + ABSOLUTE_ZERO_MILLICELSIUS; 3923331e48SAkinobu Mita } 4023331e48SAkinobu Mita millicelsius_to_milli_kelvin(long t)4123331e48SAkinobu Mitastatic inline long millicelsius_to_milli_kelvin(long t) 4223331e48SAkinobu Mita { 4323331e48SAkinobu Mita return t - ABSOLUTE_ZERO_MILLICELSIUS; 4423331e48SAkinobu Mita } 4523331e48SAkinobu Mita 4623331e48SAkinobu Mita #define MILLIDEGREE_PER_DEGREE 1000 4723331e48SAkinobu Mita #define MILLIDEGREE_PER_DECIDEGREE 100 4823331e48SAkinobu Mita kelvin_to_millicelsius(long t)4923331e48SAkinobu Mitastatic inline long kelvin_to_millicelsius(long t) 5023331e48SAkinobu Mita { 5123331e48SAkinobu Mita return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE); 5223331e48SAkinobu Mita } 5323331e48SAkinobu Mita millicelsius_to_kelvin(long t)5423331e48SAkinobu Mitastatic inline long millicelsius_to_kelvin(long t) 5523331e48SAkinobu Mita { 5623331e48SAkinobu Mita t = millicelsius_to_milli_kelvin(t); 5723331e48SAkinobu Mita 5823331e48SAkinobu Mita return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE); 5923331e48SAkinobu Mita } 6023331e48SAkinobu Mita deci_kelvin_to_celsius(long t)6123331e48SAkinobu Mitastatic inline long deci_kelvin_to_celsius(long t) 6223331e48SAkinobu Mita { 6323331e48SAkinobu Mita t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE); 6423331e48SAkinobu Mita 6523331e48SAkinobu Mita return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE); 6623331e48SAkinobu Mita } 6723331e48SAkinobu Mita celsius_to_deci_kelvin(long t)6823331e48SAkinobu Mitastatic inline long celsius_to_deci_kelvin(long t) 6923331e48SAkinobu Mita { 7023331e48SAkinobu Mita t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE); 7123331e48SAkinobu Mita 7223331e48SAkinobu Mita return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE); 7323331e48SAkinobu Mita } 7423331e48SAkinobu Mita 7523331e48SAkinobu Mita /** 7623331e48SAkinobu Mita * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius 7723331e48SAkinobu Mita * @t: temperature value in decidegrees Kelvin 7823331e48SAkinobu Mita * @offset: difference between Kelvin and Celsius in millidegrees 7923331e48SAkinobu Mita * 8023331e48SAkinobu Mita * Return: temperature value in millidegrees Celsius 8123331e48SAkinobu Mita */ deci_kelvin_to_millicelsius_with_offset(long t,long offset)8223331e48SAkinobu Mitastatic inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset) 8323331e48SAkinobu Mita { 8423331e48SAkinobu Mita return t * MILLIDEGREE_PER_DECIDEGREE - offset; 8523331e48SAkinobu Mita } 8623331e48SAkinobu Mita deci_kelvin_to_millicelsius(long t)8723331e48SAkinobu Mitastatic inline long deci_kelvin_to_millicelsius(long t) 8823331e48SAkinobu Mita { 8923331e48SAkinobu Mita return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE); 9023331e48SAkinobu Mita } 9123331e48SAkinobu Mita millicelsius_to_deci_kelvin(long t)9223331e48SAkinobu Mitastatic inline long millicelsius_to_deci_kelvin(long t) 9323331e48SAkinobu Mita { 9423331e48SAkinobu Mita t = millicelsius_to_milli_kelvin(t); 9523331e48SAkinobu Mita 9623331e48SAkinobu Mita return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE); 9723331e48SAkinobu Mita } 9823331e48SAkinobu Mita kelvin_to_celsius(long t)9923331e48SAkinobu Mitastatic inline long kelvin_to_celsius(long t) 10023331e48SAkinobu Mita { 10123331e48SAkinobu Mita return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS, 10223331e48SAkinobu Mita MILLIDEGREE_PER_DEGREE); 10323331e48SAkinobu Mita } 10423331e48SAkinobu Mita celsius_to_kelvin(long t)10523331e48SAkinobu Mitastatic inline long celsius_to_kelvin(long t) 10623331e48SAkinobu Mita { 10723331e48SAkinobu Mita return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS, 10823331e48SAkinobu Mita MILLIDEGREE_PER_DEGREE); 10923331e48SAkinobu Mita } 11023331e48SAkinobu Mita 11123331e48SAkinobu Mita #endif /* _LINUX_UNITS_H */ 112