[PATCH] i2c-vid.h: Support for VID to reg conversion

[se.witt at gmx.net (Sebastian Witt)]

Adds conversion from VID (mV) to register value. Used by the atxp1 I2C 
module.

Signed-off-by: Sebastian Witt <se.witt at gmx.net>


diff -ruN linux-2.6.12-rc2-mm3-orig/include/linux/i2c-vid.h 
linux-2.6.12-rc2-mm3/include/linux/i2c-vid.h
--- linux-2.6.12-rc2-mm3-orig/include/linux/i2c-vid.h    2005-03-02 
08:37:31.000000000 +0100
+++ linux-2.6.12-rc2-mm3/include/linux/i2c-vid.h    2005-04-12 
18:22:23.000000000 +0200
@@ -97,3 +97,22 @@
                               2050 - (val) * 50);
      }
  }
+
+static inline int vid_to_reg(int val, int vrm)
+{
+
+        switch (vrm) {
+
+        case  0:
+                return -1;
+
+        case 91:                /* VRM 9.1 */
+        case 90:                /* VRM 9.0 */
+                return ((val >= 1100) && (val <= 1850) ?
+                        ((18500 - val * 10) / 25 + 5) / 10 : -1);
+
+        default:
+                return -1;
+
+        }
+}