swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
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Tip revision: e42617b825f8073569da76dc4510bfa019b1c35a authored by Linus Torvalds on 08 December 2019, 22:57:55 UTC
Linux 5.5-rc1
Linux 5.5-rc1
Tip revision: e42617b
lm75.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
lm75.h - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 2003 Mark M. Hoffman <mhoffman@lightlink.com>
*/
/*
This file contains common code for encoding/decoding LM75 type
temperature readings, which are emulated by many of the chips
we support. As the user is unlikely to load more than one driver
which contains this code, we don't worry about the wasted space.
*/
#include <linux/kernel.h>
/* straight from the datasheet */
#define LM75_TEMP_MIN (-55000)
#define LM75_TEMP_MAX 125000
#define LM75_SHUTDOWN 0x01
/* TEMP: 0.001C/bit (-55C to +125C)
REG: (0.5C/bit, two's complement) << 7 */
static inline u16 LM75_TEMP_TO_REG(long temp)
{
int ntemp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
ntemp += (ntemp < 0 ? -250 : 250);
return (u16)((ntemp / 500) << 7);
}
static inline int LM75_TEMP_FROM_REG(u16 reg)
{
/* use integer division instead of equivalent right shift to
guarantee arithmetic shift and preserve the sign */
return ((s16)reg / 128) * 500;
}