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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-05-14 21:38:46 +02:00
Kuppuswamy Sathyanarayanan
90503f9ffe
Replace hardcoded numeric constants with standard unit conversion macros from linux/units.h for better code clarity and self-documentation. Add MICROJOULE_PER_JOULE and NANOJOULE_PER_JOULE to units.h to support energy unit conversions, following the existing pattern for power units. No functional changes. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://patch.msgid.link/20260212233044.329790-8-sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/* 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/bits.h>
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#include <linux/math.h>
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/* Metric prefixes in accordance with Système international (d'unités) */
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#define PETA 1000000000000000ULL
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#define TERA 1000000000000ULL
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#define GIGA 1000000000UL
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#define MEGA 1000000UL
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#define KILO 1000UL
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#define HECTO 100UL
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#define DECA 10UL
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#define DECI 10UL
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#define CENTI 100UL
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#define MILLI 1000UL
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#define MICRO 1000000UL
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#define NANO 1000000000UL
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#define PICO 1000000000000ULL
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#define FEMTO 1000000000000000ULL
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/*
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* Percentage and related scaling units
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*
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* These macros define scaling factors used to convert between ratio and
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* percentage-based representations with different decimal resolutions.
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* They are used for precise fractional calculations in engineering, finance,
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* and measurement applications.
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*
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* Examples:
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* 1% = 0.01 = 1 / PERCENT
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* 0.1% = 0.001 = 1 / PERMILLE
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* 0.01% = 0.0001 = 1 / PERMYRIAD (1 basis point)
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* 0.001% = 0.00001 = 1 / PERCENTMILLE
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*/
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#define PERCENT 100
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#define PERMILLE 1000
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#define PERMYRIAD 10000
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#define PERCENTMILLE 100000
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#define NANOHZ_PER_HZ 1000000000UL
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#define MICROHZ_PER_HZ 1000000UL
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#define MILLIHZ_PER_HZ 1000UL
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/* Hz based multipliers */
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#define HZ_PER_KHZ 1000UL
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#define HZ_PER_MHZ 1000000UL
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#define HZ_PER_GHZ 1000000000UL
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/* kHz based multipliers */
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#define KHZ_PER_MHZ 1000UL
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#define KHZ_PER_GHZ 1000000UL
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#define MILLIWATT_PER_WATT 1000UL
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#define MICROWATT_PER_MILLIWATT 1000UL
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#define MICROWATT_PER_WATT 1000000UL
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#define MICROJOULE_PER_JOULE 1000000UL
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#define NANOJOULE_PER_JOULE 1000000000UL
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#define BYTES_PER_KBIT (KILO / BITS_PER_BYTE)
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#define BYTES_PER_MBIT (MEGA / BITS_PER_BYTE)
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#define BYTES_PER_GBIT (GIGA / BITS_PER_BYTE)
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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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