add smsc47m1 fan driver

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1397 7894878c-1315-0410-8ee3-d5d059ff63e0

doc/chips/SUMMARY

@@ -1,7 +1,7 @@
 SUMMARY OF SUPPORTED CHIPS
 ==========================
 This is a summary of the sensor and non-sensor chips supported
-by this package. It summarizes the features of each supported chip.
+by this package. It lists the features of each supported chip.
 
 For further information on a particular chip, see the documentation
 in this directory. Data sheets are generally available on the
@@ -119,6 +119,9 @@ mtp008
 sis5595
 	sis5595 	0-1	4-5	2	-	no	yes
 
+smsc74m1
+	smsc74m1 	-	-	2	2	no	yes (LPC)
+
 thmc50
 	adm1022		3	2	-	1 dac	yes	no
 	thmc50		3	2	-	1 dac	yes	no
@@ -168,6 +171,9 @@ pcf8574 & pcf8574a
 pcf8591
 	Quad A/D + one D/A
 
+smbus-arp
+	An SMBus 2.0 ARP client
+
 
 -----------------------------------------------------------------------------
 -----------------------------------------------------------------------------

doc/chips/smsc74m1

@@ -0,0 +1,52 @@
+Kernel driver `smsc74m1.o'
+=========================
+
+Status: Beta.
+
+Supported chips:
+  * SMSC 74M1xx Super I/O Controllers
+    Addresses scanned: none, address read from Super I/O config space
+    Datasheets:
+	http://www.smsc.com/main/datasheets/47m10x.pdf
+	http://www.smsc.com/main/datasheets/47m120.pdf
+	http://www.smsc.com/main/datasheets/47m13x.pdf
+	http://www.smsc.com/main/datasheets/47m14x.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/
+
+Module Parameters
+-----------------
+
+force_addr=0xaddr	Set the I/O base address. Useful for boards
+			that don't set the address in the BIOS.
+			Don't use this unless the driver complains that the
+			base address is not set.
+			Example: 'modprobe smsc47m1 force_addr=0x680'
+
+
+Description
+-----------
+
+The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
+contain monitoring and PWM control circuitry for two fans.
+
+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. This is important because some FANs
+report only one 'tick' each rotation, while others report two - making
+all readings twice as high. 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 100%. The first value in the /proc entry is
+the percentage; the second is the enable (0 or 1).
+
+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.