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[mirror_ubuntu-jammy-kernel.git] / include / linux / units.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UNITS_H
3 #define _LINUX_UNITS_H
4
5 #include <linux/math.h>
6
7 #define MILLIWATT_PER_WATT 1000L
8 #define MICROWATT_PER_MILLIWATT 1000L
9 #define MICROWATT_PER_WATT 1000000L
10
11 #define ABSOLUTE_ZERO_MILLICELSIUS -273150
12
13 static inline long milli_kelvin_to_millicelsius(long t)
14 {
15 return t + ABSOLUTE_ZERO_MILLICELSIUS;
16 }
17
18 static inline long millicelsius_to_milli_kelvin(long t)
19 {
20 return t - ABSOLUTE_ZERO_MILLICELSIUS;
21 }
22
23 #define MILLIDEGREE_PER_DEGREE 1000
24 #define MILLIDEGREE_PER_DECIDEGREE 100
25
26 static inline long kelvin_to_millicelsius(long t)
27 {
28 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
29 }
30
31 static inline long millicelsius_to_kelvin(long t)
32 {
33 t = millicelsius_to_milli_kelvin(t);
34
35 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
36 }
37
38 static inline long deci_kelvin_to_celsius(long t)
39 {
40 t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
41
42 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
43 }
44
45 static inline long celsius_to_deci_kelvin(long t)
46 {
47 t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
48
49 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
50 }
51
52 /**
53 * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
54 * @t: temperature value in decidegrees Kelvin
55 * @offset: difference between Kelvin and Celsius in millidegrees
56 *
57 * Return: temperature value in millidegrees Celsius
58 */
59 static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
60 {
61 return t * MILLIDEGREE_PER_DECIDEGREE - offset;
62 }
63
64 static inline long deci_kelvin_to_millicelsius(long t)
65 {
66 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
67 }
68
69 static inline long millicelsius_to_deci_kelvin(long t)
70 {
71 t = millicelsius_to_milli_kelvin(t);
72
73 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
74 }
75
76 static inline long kelvin_to_celsius(long t)
77 {
78 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
79 MILLIDEGREE_PER_DEGREE);
80 }
81
82 static inline long celsius_to_kelvin(long t)
83 {
84 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
85 MILLIDEGREE_PER_DEGREE);
86 }
87
88 #endif /* _LINUX_UNITS_H */