Index: button-h10.c
===================================================================
--- button-h10.c	(revision 14690)
+++ button-h10.c	(working copy)
@@ -58,6 +58,8 @@
 /*
  * Get button pressed from hardware
  */
+int old_pos;
+int delta_pos;
 int button_read_device(void)
 {
     int btn = BUTTON_NONE;
@@ -101,13 +103,12 @@
             udelay(250);
             data = adc_scan(ADC_SCROLLPAD);
             GPIOD_OUTPUT_VAL |= 0x40;
-            
-            if(data < 0x210)
-            {
-                btn |= BUTTON_SCROLL_DOWN;
-            } else {
-                btn |= BUTTON_SCROLL_UP;
-            }
+
+            /* compare current value with previous read */
+            delta_pos = data - old_pos;
+            if(delta_pos < -13) btn |= BUTTON_SCROLL_DOWN;
+            if(delta_pos > 13) btn |= BUTTON_SCROLL_UP;
+            old_pos = data;
         }
     }