[linux-2.6-block.git] / include / linux / units.h

/* 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

#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 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 */
Commit	Line	Data
23331e48 AM	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_UNITS_H
	3	#define _LINUX_UNITS_H
	4
8e92157d	5	#include <linux/bits.h>
aa6159ab	6	#include <linux/math.h>
23331e48	7
26471d4a AS	8	/* Metric prefixes in accordance with Système international (d'unités) */
	9	#define PETA 1000000000000000ULL
	10	#define TERA 1000000000000ULL
	11	#define GIGA 1000000000UL
	12	#define MEGA 1000000UL
	13	#define KILO 1000UL
	14	#define HECTO 100UL
	15	#define DECA 10UL
	16	#define DECI 10UL
	17	#define CENTI 100UL
	18	#define MILLI 1000UL
	19	#define MICRO 1000000UL
	20	#define NANO 1000000000UL
	21	#define PICO 1000000000000ULL
	22	#define FEMTO 1000000000000000ULL
	23
d2a4cbcb DR	24	#define NANOHZ_PER_HZ 1000000000UL
	25	#define MICROHZ_PER_HZ 1000000UL
	26	#define MILLIHZ_PER_HZ 1000UL
e2c77032 DL	27	#define HZ_PER_KHZ 1000UL
	28	#define KHZ_PER_MHZ 1000UL
	29	#define HZ_PER_MHZ 1000000UL
	30
c9221919 DL	31	#define MILLIWATT_PER_WATT 1000UL
	32	#define MICROWATT_PER_MILLIWATT 1000UL
	33	#define MICROWATT_PER_WATT 1000000UL
2ee5f8f0	34
e8eed5f7 DM	35	#define BYTES_PER_KBIT (KILO / BITS_PER_BYTE)
	36	#define BYTES_PER_MBIT (MEGA / BITS_PER_BYTE)
	37	#define BYTES_PER_GBIT (GIGA / BITS_PER_BYTE)
	38
23331e48 AM	39	#define ABSOLUTE_ZERO_MILLICELSIUS -273150
	40
	41	static inline long milli_kelvin_to_millicelsius(long t)
	42	{
	43	return t + ABSOLUTE_ZERO_MILLICELSIUS;
	44	}
	45
	46	static inline long millicelsius_to_milli_kelvin(long t)
	47	{
	48	return t - ABSOLUTE_ZERO_MILLICELSIUS;
	49	}
	50
	51	#define MILLIDEGREE_PER_DEGREE 1000
	52	#define MILLIDEGREE_PER_DECIDEGREE 100
	53
	54	static inline long kelvin_to_millicelsius(long t)
	55	{
	56	return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
	57	}
	58
	59	static inline long millicelsius_to_kelvin(long t)
	60	{
	61	t = millicelsius_to_milli_kelvin(t);
	62
	63	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
	64	}
	65
	66	static inline long deci_kelvin_to_celsius(long t)
	67	{
	68	t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
	69
	70	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
	71	}
	72
	73	static inline long celsius_to_deci_kelvin(long t)
	74	{
	75	t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
	76
	77	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
	78	}
	79
	80	/**
	81	* deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
	82	* @t: temperature value in decidegrees Kelvin
	83	* @offset: difference between Kelvin and Celsius in millidegrees
	84	*
	85	* Return: temperature value in millidegrees Celsius
	86	*/
	87	static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
	88	{
	89	return t * MILLIDEGREE_PER_DECIDEGREE - offset;
	90	}
	91
	92	static inline long deci_kelvin_to_millicelsius(long t)
	93	{
	94	return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
	95	}
	96
	97	static inline long millicelsius_to_deci_kelvin(long t)
	98	{
	99	t = millicelsius_to_milli_kelvin(t);
	100
	101	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
	102	}
103
104	static inline long kelvin_to_celsius(long t)
105	{
106	return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
107	MILLIDEGREE_PER_DEGREE);
108	}
109
110	static inline long celsius_to_kelvin(long t)
111	{
112	return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
113	MILLIDEGREE_PER_DEGREE);
114	}
115
116	#endif /* _LINUX_UNITS_H */