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> !! 5 #include <linux/kernel.h>
6 #include <linux/math.h> <<
7 <<
8 /* Metric prefixes in accordance with Système <<
9 #define PETA 1000000000000000ULL <<
10 #define TERA 1000000000000ULL <<
11 #define GIGA 1000000000UL <<
12 #define MEGA 1000000UL <<
13 #define KILO 1000UL <<
14 #define HECTO 100UL <<
15 #define DECA 10UL <<
16 #define DECI 10UL <<
17 #define CENTI 100UL <<
18 #define MILLI 1000UL <<
19 #define MICRO 1000000UL <<
20 #define NANO 1000000000UL <<
21 #define PICO 1000000000000ULL <<
22 #define FEMTO 1000000000000000ULL <<
23 <<
24 #define NANOHZ_PER_HZ 1000000000UL <<
25 #define MICROHZ_PER_HZ 1000000UL <<
26 #define MILLIHZ_PER_HZ 1000UL <<
27 6
28 #define HZ_PER_KHZ 1000UL 7 #define HZ_PER_KHZ 1000UL
29 #define HZ_PER_MHZ 1000000UL <<
30 <<
31 #define KHZ_PER_MHZ 1000UL 8 #define KHZ_PER_MHZ 1000UL
32 #define KHZ_PER_GHZ 1000000UL !! 9 #define HZ_PER_MHZ 1000000UL
33 10
34 #define MILLIWATT_PER_WATT 1000UL 11 #define MILLIWATT_PER_WATT 1000UL
35 #define MICROWATT_PER_MILLIWATT 1000UL 12 #define MICROWATT_PER_MILLIWATT 1000UL
36 #define MICROWATT_PER_WATT 1000000UL 13 #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 14
42 #define ABSOLUTE_ZERO_MILLICELSIUS -273150 15 #define ABSOLUTE_ZERO_MILLICELSIUS -273150
43 16
44 static inline long milli_kelvin_to_millicelsiu 17 static inline long milli_kelvin_to_millicelsius(long t)
45 { 18 {
46 return t + ABSOLUTE_ZERO_MILLICELSIUS; 19 return t + ABSOLUTE_ZERO_MILLICELSIUS;
47 } 20 }
48 21
49 static inline long millicelsius_to_milli_kelvi 22 static inline long millicelsius_to_milli_kelvin(long t)
50 { 23 {
51 return t - ABSOLUTE_ZERO_MILLICELSIUS; 24 return t - ABSOLUTE_ZERO_MILLICELSIUS;
52 } 25 }
53 26
54 #define MILLIDEGREE_PER_DEGREE 1000 27 #define MILLIDEGREE_PER_DEGREE 1000
55 #define MILLIDEGREE_PER_DECIDEGREE 100 28 #define MILLIDEGREE_PER_DECIDEGREE 100
56 29
57 static inline long kelvin_to_millicelsius(long 30 static inline long kelvin_to_millicelsius(long t)
58 { 31 {
59 return milli_kelvin_to_millicelsius(t 32 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
60 } 33 }
61 34
62 static inline long millicelsius_to_kelvin(long 35 static inline long millicelsius_to_kelvin(long t)
63 { 36 {
64 t = millicelsius_to_milli_kelvin(t); 37 t = millicelsius_to_milli_kelvin(t);
65 38
66 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 39 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
67 } 40 }
68 41
69 static inline long deci_kelvin_to_celsius(long 42 static inline long deci_kelvin_to_celsius(long t)
70 { 43 {
71 t = milli_kelvin_to_millicelsius(t * M 44 t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
72 45
73 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 46 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
74 } 47 }
75 48
76 static inline long celsius_to_deci_kelvin(long 49 static inline long celsius_to_deci_kelvin(long t)
77 { 50 {
78 t = millicelsius_to_milli_kelvin(t * M 51 t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
79 52
80 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 53 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
81 } 54 }
82 55
83 /** 56 /**
84 * deci_kelvin_to_millicelsius_with_offset - c 57 * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
85 * @t: temperature value in decidegrees Kelvin 58 * @t: temperature value in decidegrees Kelvin
86 * @offset: difference between Kelvin and Cels 59 * @offset: difference between Kelvin and Celsius in millidegrees
87 * 60 *
88 * Return: temperature value in millidegrees C 61 * Return: temperature value in millidegrees Celsius
89 */ 62 */
90 static inline long deci_kelvin_to_millicelsius 63 static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
91 { 64 {
92 return t * MILLIDEGREE_PER_DECIDEGREE 65 return t * MILLIDEGREE_PER_DECIDEGREE - offset;
93 } 66 }
94 67
95 static inline long deci_kelvin_to_millicelsius 68 static inline long deci_kelvin_to_millicelsius(long t)
96 { 69 {
97 return milli_kelvin_to_millicelsius(t 70 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
98 } 71 }
99 72
100 static inline long millicelsius_to_deci_kelvin 73 static inline long millicelsius_to_deci_kelvin(long t)
101 { 74 {
102 t = millicelsius_to_milli_kelvin(t); 75 t = millicelsius_to_milli_kelvin(t);
103 76
104 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 77 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
105 } 78 }
106 79
107 static inline long kelvin_to_celsius(long t) 80 static inline long kelvin_to_celsius(long t)
108 { 81 {
109 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ 82 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
110 MILLIDEGR 83 MILLIDEGREE_PER_DEGREE);
111 } 84 }
112 85
113 static inline long celsius_to_kelvin(long t) 86 static inline long celsius_to_kelvin(long t)
114 { 87 {
115 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ 88 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
116 MILLIDEGR 89 MILLIDEGREE_PER_DEGREE);
117 } 90 }
118 91
119 #endif /* _LINUX_UNITS_H */ 92 #endif /* _LINUX_UNITS_H */
120 93
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