[PATCH] i2c: w83781d i2c driver updated for 2.5.66-bk4 (with sysfs support, empty tree)

This should have a working w83781d driver updated for 2.5.66-bk4.
Currently sysfs support is working, and are according to the spec
(sensors-sysfs) in the 'lm sensors sysfs file structure' thread.
Thus I used 'temp_input[1-3]', as there was not final decision
on having them temp_input[0-2] as well, for example.

drivers/i2c/chips/Kconfig

@@ -37,6 +37,20 @@ config SENSORS_LM75
 	  in the lm_sensors package, which you can download at 
 	  http://www.lm-sensors.nu
 	  
+config SENSORS_W83781D
+	tristate "  Winbond W83781D, W83782D, W83783S, W83627HF, Asus AS99127F"
+	depends on I2C && I2C_PROC
+	help
+	  If you say yes here you get support for the Winbond W8378x series
+	  of sensor chips: the W83781D, W83782D, W83783S and W83682HF,
+	  and the similar Asus AS99127F. This
+	  can also be built as a module which can be inserted and removed
+	  while the kernel is running.
+	  
+	  You will also need the latest user-space utilties: you can find them
+	  in the lm_sensors package, which you can download at
+	  http://www.lm-sensors.nu
+
 config SENSORS_VIA686A
 	tristate "  VIA686A"
 	depends on I2C && EXPERIMENTAL

include/linux/i2c-vid.h

+/*
+    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 inline 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);
+	}
+}