1 files changed, 112 insertions, 0 deletions

diff --git a/include/linux/hwmon-vid.h b/include/linux/hwmon-vid.h
new file mode 100644
index 000000000000..c45cd872c55e
--- /dev/null
+++ b/include/linux/hwmon-vid.h
@@ -0,0 +1,112 @@
+/*
+    hwmon-vid.h - VID/VRM/VRD voltage conversions
+
+    Originally part of lm_sensors
+    Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+    With assistance from Trent Piepho <xyzzy@speakeasy.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+    This file contains common code for decoding VID pins.
+    This file is #included in various chip drivers in this directory.
+    As the user is unlikely to load more than one driver which
+    includes this code we don't worry about the wasted space.
+    Reference: VRM x.y DC-DC Converter Design Guidelines,
+    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 0x00 - 0x1f; except for VRD 10.0, 0x00 - 0x3f.
+    vrm is the Intel VRM document version.
+    Note: vrm version is scaled by 10 and the return value is scaled by 1000
+    to avoid floating point in the kernel.
+*/
+
+int vid_which_vrm(void);
+
+#define DEFAULT_VRM     82
+
+static inline int vid_from_reg(int val, int vrm)
+{
+        int vid;
+
+        switch(vrm) {
+
+        case  0:
+                return 0;
+
+        case 100:               /* VRD 10.0 */
+                if((val & 0x1f) == 0x1f)
+                        return 0;
+                if((val & 0x1f) <= 0x09 || val == 0x0a)
+                        vid = 10875 - (val & 0x1f) * 250;
+                else
+                        vid = 18625 - (val & 0x1f) * 250;
+                if(val & 0x20)
+                        vid -= 125;
+                vid /= 10;      /* only return 3 dec. places for now */
+                return vid;
+
+        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 :
+                                       1850 - val * 25);
+
+        case 85:                /* VRM 8.5 */
+                return((val & 0x10  ? 25 : 0) +
+                       ((val & 0x0f) > 0x04 ? 2050 : 1250) -
+                       ((val & 0x0f) * 50));
+
+        case 84:                /* VRM 8.4 */
+                val &= 0x0f;
+                                /* fall through */
+        default:                /* VRM 8.2 */
+                return(val == 0x1f ? 0 :
+                       val & 0x10  ? 5100 - (val) * 100 :
+                                     2050 - (val) * 50);
+        }
+}
+
+static inline int vid_to_reg(int val, int vrm)
+{
+        switch (vrm) {
+        case 91:                /* VRM 9.1 */
+        case 90:                /* VRM 9.0 */
+                return ((val >= 1100) && (val <= 1850) ?
+                        ((18499 - val * 10) / 25 + 5) / 10 : -1);
+        default:
+                return -1;
+        }
+}