add support for AMD Opteron VID encoding

patch from Philip Pokorny


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1738 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -24,7 +24,8 @@ ask CVS about it:
   Library: Add support for exponents and logarithms for vt1211/vt8235 temps;
            add lm85 support
   Makefiles: Generate warnings if new library won't be found by ld.so;
-             Modules now install in kernel/drivers/i2c/[busses,chips]
+             Modules now install in kernel/drivers/i2c/[busses,chips];
+             Ensure that headers in /usr/local/include are used first
   Modules (all): Cleanups including
 		- Add #include <i2c-proc.h>
 		- C99 initializers
@@ -39,11 +40,13 @@ ask CVS about it:
 		- Remove xxx_inc_use() and xxx_dec_use() functions
 		- Use module_init() and module_exit()
 		- Update to new i2c_driver struct definition
+  Modules (several): Add support for AMD Opteron VRM (VID) encoding
   Module adm1021: Set alarm on failed reads and report old value;
                   merge changes from kernel 2.5.54
   Module bmcsensors: Fix compile when DEBUG=1
   Modules ddcmon, eeprom: Use i2c block reads if possible;
                           better error handling
+  Module gl520sm: Fix temperature over/hyst writes
   Module lm75: merge changes from kernel 2.5.54
   Module lm85: New
   Module i2c-amd756: merge changes from kernel 2.5.54

doc/vid

@@ -23,6 +23,8 @@ The common versions are as follows:
 
 Document Version	Voltage Range	Increment	Processors
 ----------------	-------------	---------	----------
+"2.4"			0.8 - 1.55	0.025V		AMD Opteron 24x
+
 8.2 (8.1, 8.3)		1.30 - 2.05V    0.05V		PII, PIII, Celeron
 			2.1 - 3.5V	0.10V
 
@@ -34,6 +36,8 @@ Document Version	Voltage Range	Increment	Processors
 9.0, (9.1)		1.100 - 1.850V	0.025V		P4, AMD Socket A
 
 
+"2.4" is not an actual document version but simply a way to identify
+AMD Opteron 24x processors.
 Note that versions 8.1 - 8.4 are compatible.
 
 lm_sensors versions through 2.6.3 support only the VRM 8.2 standard.

kernel/include/sensors_vid.h

@@ -28,6 +28,21 @@
     available at http://developer.intel.com
 */
 
+/*
+    AMD Opteron processors don't follow the Intel VRM spec.
+    I'm going to "make up" 2.4 as the VRM spec for the Opterons.
+    No good reason just a mnemonic for the 24x Opteron processor
+    series
+
+    Opteron VID encoding is:
+
+       00000  =  1.550 V
+       00001  =  1.525 V
+        . . . .
+       11110  =  0.800 V
+       11111  =  0.000 V (off)
+ */
+
 /*
     Legal val values 00 - 1F.
     vrm is the Intel VRM document version.
@@ -41,6 +56,9 @@ static inline int vid_from_reg(int val, int vrm)
 {
 	switch(vrm) {
 
+	case 24:		/* Opteron processor */
+		return(val == 0x1f ? 0 : 1550 - val * 25);
+
 	case 91:		/* VRM 9.1 */
 	case 90:		/* VRM 9.0 */
 		return(val == 0x1f ? 0 :