linux-stable/drivers/hwmon/lm75.h
Michal Orzel 8cbf217223 hwmon: (lm75) Fix all coding-style warnings on lm75 driver
Check/fix all warnings generated by checkpatch.pl script on LM75 driver.

Signed-off-by: Michal Orzel <michalorzel.eng@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-05-22 06:28:38 -07:00

40 lines
1.1 KiB
C

/* 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;
}