aboutsummaryrefslogtreecommitdiff
path: root/Documentation/i2c/chips/smsc47m1
diff options
context:
space:
mode:
authorJeff Garzik <jgarzik@pretzel.yyz.us>2005-06-26 17:11:03 -0400
committerJeff Garzik <jgarzik@pobox.com>2005-06-26 17:11:03 -0400
commit8b0ee07e108b2eefdab5bb73f33223f18926c3b2 (patch)
treef68ca04180c5488301a40ec212ef2eb2467cf56c /Documentation/i2c/chips/smsc47m1
parent4638aef40ba9ebb9734caeed1f373c24015259fd (diff)
parent8678887e7fb43cd6c9be6c9807b05e77848e0920 (diff)
Merge upstream (approx. 2.6.12-git8) into 'janitor' branch of netdev-2.6.
Diffstat (limited to 'Documentation/i2c/chips/smsc47m1')
-rw-r--r--Documentation/i2c/chips/smsc47m152
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/i2c/chips/smsc47m1 b/Documentation/i2c/chips/smsc47m1
new file mode 100644
index 00000000000..34e6478c142
--- /dev/null
+++ b/Documentation/i2c/chips/smsc47m1
@@ -0,0 +1,52 @@
+Kernel driver smsc47m1
+======================
+
+Supported chips:
+ * SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x, LPC47M15x and LPC47M192
+ Addresses scanned: none, address read from Super I/O config space
+ Prefix: 'smsc47m1'
+ Datasheets:
+ http://www.smsc.com/main/datasheets/47b27x.pdf
+ http://www.smsc.com/main/datasheets/47m10x.pdf
+ http://www.smsc.com/main/tools/discontinued/47m13x.pdf
+ http://www.smsc.com/main/datasheets/47m14x.pdf
+ http://www.smsc.com/main/tools/discontinued/47m15x.pdf
+ http://www.smsc.com/main/datasheets/47m192.pdf
+
+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 <khali@linux-fr.org>
+
+Description
+-----------
+
+The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
+contain monitoring and PWM control circuitry for two fans.
+
+The 47M15x and 47M192 chips contain a full 'hardware monitoring block'
+in addition to the fan monitoring and control. The hardware monitoring
+block is not supported by the driver.
+
+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.