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

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