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/Documentation/hwmon/smsc47m1 | |
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/Documentation/hwmon/smsc47m1')
-rw-r--r-- | kernel/Documentation/hwmon/smsc47m1 | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/kernel/Documentation/hwmon/smsc47m1 b/kernel/Documentation/hwmon/smsc47m1 new file mode 100644 index 000000000..10a24b420 --- /dev/null +++ b/kernel/Documentation/hwmon/smsc47m1 @@ -0,0 +1,63 @@ +Kernel driver smsc47m1 +====================== + +Supported chips: + * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, + LPC47M15x and LPC47M192 + Addresses scanned: none, address read from Super I/O config space + Prefix: 'smsc47m1' + Datasheets: + http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf + http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf + http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf + http://www.smsc.com/ + * SMSC LPC47M292 + Addresses scanned: none, address read from Super I/O config space + Prefix: 'smsc47m2' + Datasheet: Not public + * SMSC LPC47M997 + Addresses scanned: none, address read from Super I/O config space + Prefix: 'smsc47m1' + Datasheet: none + +Authors: + Mark D. Studebaker <mdsxyz123@yahoo.com>, + With assistance from Bruce Allen <ballen@uwm.edu>, and his + fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ + Gabriele Gorla <gorlik@yahoo.com>, + Jean Delvare <jdelvare@suse.de> + +Description +----------- + +The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips +contain monitoring and PWM control circuitry for two fans. + +The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware +monitoring block' in addition to the fan monitoring and control. The +hardware monitoring block is not supported by this driver, use the +smsc47m192 driver for that. + +No documentation is available for the 47M997, but it has the same device +ID as the 47M15x and 47M192 chips and seems to be compatible. + +Fan rotation speeds are reported in RPM (rotations per minute). An alarm is +triggered if the rotation speed has dropped below a programmable limit. Fan +readings can be divided by a programmable divider (1, 2, 4 or 8) to give +the readings more range or accuracy. Not all RPM values can accurately be +represented, so some rounding is done. With a divider of 2, the lowest +representable value is around 2600 RPM. + +PWM values are from 0 to 255. + +If an alarm triggers, it will remain triggered until the hardware register +is read at least once. This means that the cause for the alarm may +already have disappeared! Note that in the current implementation, all +hardware registers are read whenever any data is read (unless it is less +than 1.5 seconds since the last update). This means that you can easily +miss once-only alarms. + + +********************** +The lm_sensors project gratefully acknowledges the support of +Intel in the development of this driver. |