summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/smsc47m1.rst
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/hwmon/smsc47m1.rst
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--Documentation/hwmon/smsc47m1.rst86
1 files changed, 86 insertions, 0 deletions
diff --git a/Documentation/hwmon/smsc47m1.rst b/Documentation/hwmon/smsc47m1.rst
new file mode 100644
index 000000000..c54eabd5e
--- /dev/null
+++ b/Documentation/hwmon/smsc47m1.rst
@@ -0,0 +1,86 @@
+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.