diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/hwmon/lm75.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/hwmon/lm75.h')
-rw-r--r-- | kernel/drivers/hwmon/lm75.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/drivers/hwmon/lm75.h b/kernel/drivers/hwmon/lm75.h new file mode 100644 index 000000000..5cde94e56 --- /dev/null +++ b/kernel/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 <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; +} |