Modifying X.Org Xserver DDX to allow to run X with ordinary user

permissions when no access to HW registers is required. For API changes
    which mostly involve the modifications to make the RRFunc (introduced
    with 6.8) more flexible please check Bugzilla #2407. NOTE: This patch
    applies changes to OS specific files for other OSes which I cannot
    test.

src/fbdev.c

@@ -2,7 +2,7 @@
 
 /*
  * Authors:  Alan Hourihane, <alanh@fairlite.demon.co.uk>
- *	     Michel Dänzer, <michdaen@iiic.ethz.ch>
+ *	     Michel Dänzer, <michdaen@iiic.ethz.ch>
  */
 
 /* all driver need this */
@@ -57,6 +57,8 @@ static void *	FBDevWindowLinear(ScreenPtr pScreen, CARD32 row, CARD32 offset, in
 				  CARD32 *size, void *closure);
 static void	FBDevPointerMoved(int index, int x, int y);
 static Bool	FBDevDGAInit(ScrnInfoPtr pScrn, ScreenPtr pScreen);
+static Bool	FBDevDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op,
+				pointer ptr);
 
 
 enum { FBDEV_ROTATE_NONE=0, FBDEV_ROTATE_CW=270, FBDEV_ROTATE_UD=180, FBDEV_ROTATE_CCW=90 };
@@ -91,7 +93,8 @@ DriverRec FBDEV = {
 	FBDevProbe,
 	FBDevAvailableOptions,
 	NULL,
-	0
+	0,
+	FBDevDriverFunc
 };
 
 /* Supported "chipsets" */
@@ -208,7 +211,7 @@ FBDevSetup(pointer module, pointer opts, int *errmaj, int *errmin)
 
 	if (!setupDone) {
 		setupDone = TRUE;
-		xf86AddDriver(&FBDEV, module, 0);
+		xf86AddDriver(&FBDEV, module, HaveDriverFuncs);
 		LoaderRefSymLists(afbSymbols, fbSymbols,
 				  shadowSymbols, fbdevHWSymbols, NULL);
 		return (pointer)1;
@@ -1100,3 +1103,18 @@ FBDevDGAInit(ScrnInfoPtr pScrn, ScreenPtr pScreen)
     return (DGAInit(pScreen, &FBDevDGAFunctions,
 	    fPtr->pDGAMode, fPtr->nDGAMode));
 }
+
+static Bool
+FBDevDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op, pointer ptr)
+{
+    xorgHWFlags *flag;
+    
+    switch (op) {
+	case GET_REQUIRED_HW_INTERFACES:
+	    flag = (CARD32*)ptr;
+	    (*flag) = 0;
+	    return TRUE;
+	default:
+	    return FALSE;
+    }
+}