[mirror_ubuntu-jammy-kernel.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 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
e2c77032 DL	23	#define HZ_PER_KHZ 1000UL
	24	#define KHZ_PER_MHZ 1000UL
	25	#define HZ_PER_MHZ 1000000UL
	26
c9221919 DL	27	#define MILLIWATT_PER_WATT 1000UL
	28	#define MICROWATT_PER_MILLIWATT 1000UL
	29	#define MICROWATT_PER_WATT 1000000UL
2ee5f8f0	30
23331e48 AM	31	#define ABSOLUTE_ZERO_MILLICELSIUS -273150
	32
	33	static inline long milli_kelvin_to_millicelsius(long t)
	34	{
	35	return t + ABSOLUTE_ZERO_MILLICELSIUS;
	36	}
	37
	38	static inline long millicelsius_to_milli_kelvin(long t)
	39	{
	40	return t - ABSOLUTE_ZERO_MILLICELSIUS;
	41	}
	42
	43	#define MILLIDEGREE_PER_DEGREE 1000
	44	#define MILLIDEGREE_PER_DECIDEGREE 100
	45
	46	static inline long kelvin_to_millicelsius(long t)
	47	{
	48	return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
	49	}
	50
	51	static inline long millicelsius_to_kelvin(long t)
	52	{
	53	t = millicelsius_to_milli_kelvin(t);
	54
	55	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
	56	}
	57
	58	static inline long deci_kelvin_to_celsius(long t)
	59	{
	60	t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
	61
	62	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
	63	}
	64
	65	static inline long celsius_to_deci_kelvin(long t)
	66	{
	67	t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
	68
	69	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
	70	}
	71
	72	/**
	73	* deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
	74	* @t: temperature value in decidegrees Kelvin
	75	* @offset: difference between Kelvin and Celsius in millidegrees
	76	*
	77	* Return: temperature value in millidegrees Celsius
	78	*/
	79	static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
	80	{
	81	return t * MILLIDEGREE_PER_DECIDEGREE - offset;
	82	}
	83
	84	static inline long deci_kelvin_to_millicelsius(long t)
	85	{
	86	return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
	87	}
	88
	89	static inline long millicelsius_to_deci_kelvin(long t)
	90	{
	91	t = millicelsius_to_milli_kelvin(t);
	92
	93	return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
	94	}
95
96	static inline long kelvin_to_celsius(long t)
97	{
98	return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
99	MILLIDEGREE_PER_DEGREE);
100	}
101
102	static inline long celsius_to_kelvin(long t)
103	{
104	return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
105	MILLIDEGREE_PER_DEGREE);
106	}
107
108	#endif /* _LINUX_UNITS_H */