preliminary programmable VRM version support in w83781d.

Replace VID_FROM_REG() with vid_from_reg() in new sensors_vid.h.
      Update library so it can be set in sensors.conf.
      Add new documentation. Update mkpatch for new file.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1352 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/include/sensors.h

@@ -70,6 +70,7 @@
 #define W83781D_SYSCTL_TEMP2 1201	/* Degrees Celcius * 10 */
 #define W83781D_SYSCTL_TEMP3 1202	/* Degrees Celcius * 10 */
 #define W83781D_SYSCTL_VID 1300	/* Volts * 100 */
+#define W83781D_SYSCTL_VRM 1301
 #define W83781D_SYSCTL_PWM1 1401
 #define W83781D_SYSCTL_PWM2 1402
 #define W83781D_SYSCTL_PWM3 1403

kernel/include/sensors_vid.h

@@ -0,0 +1,64 @@
+/*
+    vrm.c - Part of lm_sensors, Linux kernel modules for hardware
+               monitoring
+    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
+*/
+
+/*
+    Legal val values 00 - 1F.
+    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.
+*/
+
+#define DEFAULT_VRM	82
+
+static int vid_from_reg(int val, int vrm);
+
+static int vid_from_reg(int val, int vrm)
+{
+	switch(vrm) {
+
+	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);
+	}
+}