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 <<
25 #define MICROHZ_PER_HZ 1000000UL <<
26 #define MILLIHZ_PER_HZ 1000UL <<
27 <<
28 #define HZ_PER_KHZ 1000UL 23 #define HZ_PER_KHZ 1000UL
29 #define HZ_PER_MHZ 1000000UL <<
30 <<
31 #define KHZ_PER_MHZ 1000UL 24 #define KHZ_PER_MHZ 1000UL
32 #define KHZ_PER_GHZ 1000000UL !! 25 #define HZ_PER_MHZ 1000000UL
33 26
34 #define MILLIWATT_PER_WATT 1000UL 27 #define MILLIWATT_PER_WATT 1000UL
35 #define MICROWATT_PER_MILLIWATT 1000UL 28 #define MICROWATT_PER_MILLIWATT 1000UL
36 #define MICROWATT_PER_WATT 1000000UL 29 #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 30
42 #define ABSOLUTE_ZERO_MILLICELSIUS -273150 31 #define ABSOLUTE_ZERO_MILLICELSIUS -273150
43 32
44 static inline long milli_kelvin_to_millicelsiu 33 static inline long milli_kelvin_to_millicelsius(long t)
45 { 34 {
46 return t + ABSOLUTE_ZERO_MILLICELSIUS; 35 return t + ABSOLUTE_ZERO_MILLICELSIUS;
47 } 36 }
48 37
49 static inline long millicelsius_to_milli_kelvi 38 static inline long millicelsius_to_milli_kelvin(long t)
50 { 39 {
51 return t - ABSOLUTE_ZERO_MILLICELSIUS; 40 return t - ABSOLUTE_ZERO_MILLICELSIUS;
52 } 41 }
53 42
54 #define MILLIDEGREE_PER_DEGREE 1000 43 #define MILLIDEGREE_PER_DEGREE 1000
55 #define MILLIDEGREE_PER_DECIDEGREE 100 44 #define MILLIDEGREE_PER_DECIDEGREE 100
56 45
57 static inline long kelvin_to_millicelsius(long 46 static inline long kelvin_to_millicelsius(long t)
58 { 47 {
59 return milli_kelvin_to_millicelsius(t 48 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
60 } 49 }
61 50
62 static inline long millicelsius_to_kelvin(long 51 static inline long millicelsius_to_kelvin(long t)
63 { 52 {
64 t = millicelsius_to_milli_kelvin(t); 53 t = millicelsius_to_milli_kelvin(t);
65 54
66 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 55 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
67 } 56 }
68 57
69 static inline long deci_kelvin_to_celsius(long 58 static inline long deci_kelvin_to_celsius(long t)
70 { 59 {
71 t = milli_kelvin_to_millicelsius(t * M 60 t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
72 61
73 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 62 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
74 } 63 }
75 64
76 static inline long celsius_to_deci_kelvin(long 65 static inline long celsius_to_deci_kelvin(long t)
77 { 66 {
78 t = millicelsius_to_milli_kelvin(t * M 67 t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
79 68
80 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 69 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
81 } 70 }
82 71
83 /** 72 /**
84 * deci_kelvin_to_millicelsius_with_offset - c 73 * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
85 * @t: temperature value in decidegrees Kelvin 74 * @t: temperature value in decidegrees Kelvin
86 * @offset: difference between Kelvin and Cels 75 * @offset: difference between Kelvin and Celsius in millidegrees
87 * 76 *
88 * Return: temperature value in millidegrees C 77 * Return: temperature value in millidegrees Celsius
89 */ 78 */
90 static inline long deci_kelvin_to_millicelsius 79 static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
91 { 80 {
92 return t * MILLIDEGREE_PER_DECIDEGREE 81 return t * MILLIDEGREE_PER_DECIDEGREE - offset;
93 } 82 }
94 83
95 static inline long deci_kelvin_to_millicelsius 84 static inline long deci_kelvin_to_millicelsius(long t)
96 { 85 {
97 return milli_kelvin_to_millicelsius(t 86 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
98 } 87 }
99 88
100 static inline long millicelsius_to_deci_kelvin 89 static inline long millicelsius_to_deci_kelvin(long t)
101 { 90 {
102 t = millicelsius_to_milli_kelvin(t); 91 t = millicelsius_to_milli_kelvin(t);
103 92
104 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 93 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
105 } 94 }
106 95
107 static inline long kelvin_to_celsius(long t) 96 static inline long kelvin_to_celsius(long t)
108 { 97 {
109 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ 98 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
110 MILLIDEGR 99 MILLIDEGREE_PER_DEGREE);
111 } 100 }
112 101
113 static inline long celsius_to_kelvin(long t) 102 static inline long celsius_to_kelvin(long t)
114 { 103 {
115 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ 104 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
116 MILLIDEGR 105 MILLIDEGREE_PER_DEGREE);
117 } 106 }
118 107
119 #endif /* _LINUX_UNITS_H */ 108 #endif /* _LINUX_UNITS_H */
120 109
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