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88 lines
2.1 KiB
88 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_UNITS_H |
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#define _LINUX_UNITS_H |
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#include <linux/math.h> |
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#define MILLIWATT_PER_WATT 1000L |
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#define MICROWATT_PER_MILLIWATT 1000L |
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#define MICROWATT_PER_WATT 1000000L |
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#define ABSOLUTE_ZERO_MILLICELSIUS -273150 |
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static inline long milli_kelvin_to_millicelsius(long t) |
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{ |
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return t + ABSOLUTE_ZERO_MILLICELSIUS; |
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} |
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static inline long millicelsius_to_milli_kelvin(long t) |
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{ |
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return t - ABSOLUTE_ZERO_MILLICELSIUS; |
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} |
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#define MILLIDEGREE_PER_DEGREE 1000 |
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#define MILLIDEGREE_PER_DECIDEGREE 100 |
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static inline long kelvin_to_millicelsius(long t) |
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{ |
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return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE); |
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} |
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static inline long millicelsius_to_kelvin(long t) |
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{ |
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t = millicelsius_to_milli_kelvin(t); |
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE); |
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} |
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static inline long deci_kelvin_to_celsius(long t) |
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{ |
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t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE); |
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE); |
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} |
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static inline long celsius_to_deci_kelvin(long t) |
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{ |
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t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE); |
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE); |
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} |
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/** |
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* deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius |
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* @t: temperature value in decidegrees Kelvin |
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* @offset: difference between Kelvin and Celsius in millidegrees |
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* |
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* Return: temperature value in millidegrees Celsius |
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*/ |
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static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset) |
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{ |
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return t * MILLIDEGREE_PER_DECIDEGREE - offset; |
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} |
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static inline long deci_kelvin_to_millicelsius(long t) |
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{ |
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return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE); |
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} |
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static inline long millicelsius_to_deci_kelvin(long t) |
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{ |
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t = millicelsius_to_milli_kelvin(t); |
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return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE); |
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} |
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static inline long kelvin_to_celsius(long t) |
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{ |
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return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS, |
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MILLIDEGREE_PER_DEGREE); |
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} |
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static inline long celsius_to_kelvin(long t) |
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{ |
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return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS, |
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MILLIDEGREE_PER_DEGREE); |
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} |
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#endif /* _LINUX_UNITS_H */
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