5a4c060114
File lm75.h used to include <linux/hwmon.h> for SENSORS_LIMIT() but this function is gone by now. Instead we call clamp_val() so we should include <linux/kernel.h>, where this function is declared. Signed-off-by: Jean Delvare <khali@linux-fr.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/*
|
|
lm75.h - Part of lm_sensors, Linux kernel modules for hardware
|
|
monitoring
|
|
Copyright (c) 2003 Mark M. Hoffman <mhoffman@lightlink.com>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
/*
|
|
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;
|
|
}
|