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/* 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 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 */
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