1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UNITS_H 2 #ifndef _LINUX_UNITS_H
3 #define _LINUX_UNITS_H 3 #define _LINUX_UNITS_H
4 4
5 #include <linux/bits.h> <<
6 #include <linux/math.h> 5 #include <linux/math.h>
7 6
8 /* Metric prefixes in accordance with Système 7 /* Metric prefixes in accordance with Système international (d'unités) */
9 #define PETA 1000000000000000ULL 8 #define PETA 1000000000000000ULL
10 #define TERA 1000000000000ULL 9 #define TERA 1000000000000ULL
11 #define GIGA 1000000000UL 10 #define GIGA 1000000000UL
12 #define MEGA 1000000UL 11 #define MEGA 1000000UL
13 #define KILO 1000UL 12 #define KILO 1000UL
14 #define HECTO 100UL 13 #define HECTO 100UL
15 #define DECA 10UL 14 #define DECA 10UL
16 #define DECI 10UL 15 #define DECI 10UL
17 #define CENTI 100UL 16 #define CENTI 100UL
18 #define MILLI 1000UL 17 #define MILLI 1000UL
19 #define MICRO 1000000UL 18 #define MICRO 1000000UL
20 #define NANO 1000000000UL 19 #define NANO 1000000000UL
21 #define PICO 1000000000000ULL 20 #define PICO 1000000000000ULL
22 #define FEMTO 1000000000000000ULL 21 #define FEMTO 1000000000000000ULL
23 22
24 #define NANOHZ_PER_HZ 1000000000UL 23 #define NANOHZ_PER_HZ 1000000000UL
25 #define MICROHZ_PER_HZ 1000000UL 24 #define MICROHZ_PER_HZ 1000000UL
26 #define MILLIHZ_PER_HZ 1000UL 25 #define MILLIHZ_PER_HZ 1000UL
27 <<
28 #define HZ_PER_KHZ 1000UL 26 #define HZ_PER_KHZ 1000UL
29 #define HZ_PER_MHZ 1000000UL <<
30 <<
31 #define KHZ_PER_MHZ 1000UL 27 #define KHZ_PER_MHZ 1000UL
32 #define KHZ_PER_GHZ 1000000UL !! 28 #define HZ_PER_MHZ 1000000UL
33 29
34 #define MILLIWATT_PER_WATT 1000UL 30 #define MILLIWATT_PER_WATT 1000UL
35 #define MICROWATT_PER_MILLIWATT 1000UL 31 #define MICROWATT_PER_MILLIWATT 1000UL
36 #define MICROWATT_PER_WATT 1000000UL 32 #define MICROWATT_PER_WATT 1000000UL
37 <<
38 #define BYTES_PER_KBIT (KILO / BITS_P <<
39 #define BYTES_PER_MBIT (MEGA / BITS_P <<
40 #define BYTES_PER_GBIT (GIGA / BITS_P <<
41 33
42 #define ABSOLUTE_ZERO_MILLICELSIUS -273150 34 #define ABSOLUTE_ZERO_MILLICELSIUS -273150
43 35
44 static inline long milli_kelvin_to_millicelsiu 36 static inline long milli_kelvin_to_millicelsius(long t)
45 { 37 {
46 return t + ABSOLUTE_ZERO_MILLICELSIUS; 38 return t + ABSOLUTE_ZERO_MILLICELSIUS;
47 } 39 }
48 40
49 static inline long millicelsius_to_milli_kelvi 41 static inline long millicelsius_to_milli_kelvin(long t)
50 { 42 {
51 return t - ABSOLUTE_ZERO_MILLICELSIUS; 43 return t - ABSOLUTE_ZERO_MILLICELSIUS;
52 } 44 }
53 45
54 #define MILLIDEGREE_PER_DEGREE 1000 46 #define MILLIDEGREE_PER_DEGREE 1000
55 #define MILLIDEGREE_PER_DECIDEGREE 100 47 #define MILLIDEGREE_PER_DECIDEGREE 100
56 48
57 static inline long kelvin_to_millicelsius(long 49 static inline long kelvin_to_millicelsius(long t)
58 { 50 {
59 return milli_kelvin_to_millicelsius(t 51 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
60 } 52 }
61 53
62 static inline long millicelsius_to_kelvin(long 54 static inline long millicelsius_to_kelvin(long t)
63 { 55 {
64 t = millicelsius_to_milli_kelvin(t); 56 t = millicelsius_to_milli_kelvin(t);
65 57
66 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 58 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
67 } 59 }
68 60
69 static inline long deci_kelvin_to_celsius(long 61 static inline long deci_kelvin_to_celsius(long t)
70 { 62 {
71 t = milli_kelvin_to_millicelsius(t * M 63 t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
72 64
73 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 65 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
74 } 66 }
75 67
76 static inline long celsius_to_deci_kelvin(long 68 static inline long celsius_to_deci_kelvin(long t)
77 { 69 {
78 t = millicelsius_to_milli_kelvin(t * M 70 t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
79 71
80 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 72 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
81 } 73 }
82 74
83 /** 75 /**
84 * deci_kelvin_to_millicelsius_with_offset - c 76 * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
85 * @t: temperature value in decidegrees Kelvin 77 * @t: temperature value in decidegrees Kelvin
86 * @offset: difference between Kelvin and Cels 78 * @offset: difference between Kelvin and Celsius in millidegrees
87 * 79 *
88 * Return: temperature value in millidegrees C 80 * Return: temperature value in millidegrees Celsius
89 */ 81 */
90 static inline long deci_kelvin_to_millicelsius 82 static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
91 { 83 {
92 return t * MILLIDEGREE_PER_DECIDEGREE 84 return t * MILLIDEGREE_PER_DECIDEGREE - offset;
93 } 85 }
94 86
95 static inline long deci_kelvin_to_millicelsius 87 static inline long deci_kelvin_to_millicelsius(long t)
96 { 88 {
97 return milli_kelvin_to_millicelsius(t 89 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
98 } 90 }
99 91
100 static inline long millicelsius_to_deci_kelvin 92 static inline long millicelsius_to_deci_kelvin(long t)
101 { 93 {
102 t = millicelsius_to_milli_kelvin(t); 94 t = millicelsius_to_milli_kelvin(t);
103 95
104 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 96 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
105 } 97 }
106 98
107 static inline long kelvin_to_celsius(long t) 99 static inline long kelvin_to_celsius(long t)
108 { 100 {
109 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ 101 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
110 MILLIDEGR 102 MILLIDEGREE_PER_DEGREE);
111 } 103 }
112 104
113 static inline long celsius_to_kelvin(long t) 105 static inline long celsius_to_kelvin(long t)
114 { 106 {
115 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ 107 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
116 MILLIDEGR 108 MILLIDEGREE_PER_DEGREE);
117 } 109 }
118 110
119 #endif /* _LINUX_UNITS_H */ 111 #endif /* _LINUX_UNITS_H */
120 112
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