initial brief doc for mtp008

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@969 7894878c-1315-0410-8ee3-d5d059ff63e0

doc/chips/mtp008

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+Kernel driver `mtp008.o'
+=========================
+
+Status: Complete; Alpha.
+
+Supported chips:
+  * Myson MTP008
+    Prefix `mtp008'
+    Addresses scanned: I2C 0x2c - 0x2e (inclusive)
+    Datasheet: Publicly available at the Myson website
+
+Author: Kris Van Hees <aedil@alchar.org>
+
+
+Description
+-----------
+
+The Myson MTP008 is similar in function to the Winbond W83781D and the
+National Semi LM78. See documentation for those chips for an overview.
+
+
+The MTP008 chip has three inputs that are configurable.
+One input is always temp1, and the sensor type is configured with the sensor1 entry.
+One input is either in4 or temp2, and is configured with the sensor2 entry.
+One input is either in5 or temp3, and is configured with the sensor3 entry.
+
+We are making the initial assumption that
+AIN4 is to be configured as PII temp sensor 2.
+We are also making the assumption that
+AIN5 is hooked up to the -12V sensing circuit.
+This is the configuration on the Tyan S1824D motherboard.
+
+Setting temp sensors 1 and 2 to be a PII sensors is done as follows:
+
+         Register 0x57: 0 0 0 0 1 1 0 0
+                                | \ / +-- AIN5/VT3 with AIN5
+                                |  +----- AIN4/VT2/PII with PII
+                                +-------- VT1/PII with PII
+
+
+The MTP008 has sensor type selection in /proc like the Winbond W83782D.
+However, the appropriate values used to make the selection are different.
+
+To select a sensor type, echo the value to the /proc entry, for example:
+	echo 1 > /proc/sys/dev/sensors/mtp008-i2c-0-2d/sensor1
+
+Sensor selection is as follows:
+
+      Value	Function					Valid on sensors
+      -----	--------					----------------
+	1	Analog input (not for temperature sensing)	2,3
+	2	Thermistor					1,2,3
+	3	Pentium diode					1,2
+
+
+Maintainer
+-----------------
+Send requests to the sensors@stimpy.netroedge.com mailing list.