From 8d5d45fb14680326f833295f2316a4ec5e357220 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 2 Jul 2005 18:20:26 +0200 Subject: [PATCH] I2C: Move hwmon drivers (2/3) Part 2: Move the driver files themselves. Note that the patch "adds trailing whitespace", because it does move the files as-is, and some files happen to have trailing whitespace. From: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/lm75.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/hwmon/lm75.h (limited to 'drivers/hwmon/lm75.h') diff --git a/drivers/hwmon/lm75.h b/drivers/hwmon/lm75.h new file mode 100644 index 00000000000..63e3f2fb4c2 --- /dev/null +++ b/drivers/hwmon/lm75.h @@ -0,0 +1,49 @@ +/* + lm75.h - Part of lm_sensors, Linux kernel modules for hardware + monitoring + Copyright (c) 2003 Mark M. Hoffman + + 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 + +/* straight from the datasheet */ +#define LM75_TEMP_MIN (-55000) +#define LM75_TEMP_MAX 125000 + +/* TEMP: 0.001C/bit (-55C to +125C) + REG: (0.5C/bit, two's complement) << 7 */ +static inline u16 LM75_TEMP_TO_REG(int temp) +{ + int ntemp = SENSORS_LIMIT(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; +} + -- cgit v1.2.3