Xorg: add -modalias option

This scans the installed video drivers and prints a Linux-style modalias
listing of the devices each driver claims to support.

hw/xfree86/common/xf86.h

@@ -56,6 +56,7 @@
 
 /* General parameters */
 extern int xf86DoConfigure;
+extern Bool xf86DoModalias;
 extern Bool xf86DoConfigurePass1;
 extern DevPrivateKey xf86ScreenKey;
 extern DevPrivateKey xf86CreateRootWindowKey;

hw/xfree86/common/xf86Globals.c

@@ -144,6 +144,7 @@ Bool xf86Resetting = FALSE;
 Bool xf86Initialising = FALSE;
 Bool xf86DoProbe = FALSE;
 Bool xf86DoConfigure = FALSE;
+Bool xf86DoModalias = FALSE;
 DriverPtr *xf86DriverList = NULL;
 int xf86NumDrivers = 0;
 InputDriverPtr *xf86InputDriverList = NULL;

hw/xfree86/common/xf86Helper.c

@@ -1472,6 +1472,8 @@ xf86MatchDevice(const char *drivername, GDevPtr **sectlist)
     if (sectlist)
 	*sectlist = NULL;
 
+    if (xf86DoModalias) return 0;
+
     if (xf86DoProbe) return 1;
 
     if (xf86DoConfigure && xf86DoConfigurePass1) return 1;

hw/xfree86/common/xf86Init.c

@@ -244,6 +244,84 @@ xf86PrintMarkers()
   LogPrintMarkers();
 }
 
+static void
+DoModalias()
+{
+    int i = -1;
+    char **vlist;
+
+    /* Get all the drivers */
+    vlist = xf86DriverlistFromCompile();
+    if (!vlist) {
+	ErrorF("Missing output drivers.  PCI Access dump failed.\n");
+	goto bail;
+    }
+
+    /* Load all the drivers that were found. */
+    xf86LoadModules(vlist, NULL);
+
+    xfree(vlist);
+
+    /* Iterate through each driver */
+    for (i = 0; i < xf86NumDrivers; i++) {
+        struct pci_id_match *match;
+
+        /* Iterate through each pci id match data, dumping it to the screen */
+        for (match = (struct pci_id_match *) xf86DriverList[i]->supported_devices ;
+                 match && !(!match->vendor_id && !match->device_id) ; match++) {
+             /* Prefix */
+             ErrorF("alias pci:");
+
+             /* Vendor */
+             if (match->vendor_id == ~0)
+                 ErrorF("v*");
+             else
+                 ErrorF("v%08X", match->vendor_id);
+
+             /* Device */
+             if (match->device_id == ~0)
+                 ErrorF("d*");
+             else
+                 ErrorF("d%08X", match->device_id);
+
+             /* Subvendor */
+             if (match->subvendor_id == ~0)
+                 ErrorF("sv*");
+             else
+                 ErrorF("sv%08X", match->subvendor_id);
+
+             /* Subdevice */
+             if (match->subdevice_id == ~0)
+                 ErrorF("sd*");
+             else
+                 ErrorF("sd%08X", match->subdevice_id);
+
+             /* Class */
+             if (match->device_class_mask >> 16 & 0xFF == 0xFF)
+                 ErrorF("bc%02X", match->device_class >> 16 & 0xFF);
+             else
+                 ErrorF("bc*");
+             if (match->device_class_mask >> 8 & 0xFF == 0xFF)
+                 ErrorF("sc%02X", match->device_class >> 8 & 0xFF);
+             else
+                 ErrorF("sc*");
+             if (match->device_class_mask & 0xFF == 0xFF)
+                 ErrorF("i%02X*", match->device_class & 0xFF);
+             else
+                 ErrorF("i*");
+
+             /* Suffix (driver) */
+             ErrorF(" %s\n", xf86DriverList[i]->driverName);
+        }
+    }
+
+bail:
+    OsCleanup(TRUE);
+    AbortDDX();
+    fflush(stderr);
+    exit(0);
+}
+
 static Bool
 xf86CreateRootWindow(WindowPtr pWin)
 {
@@ -596,19 +674,21 @@ InitOutput(ScreenInfo *pScreenInfo, int argc, char **argv)
     else
       xf86ServerName = argv[0];
 
-    xf86PrintBanner();
-    xf86PrintMarkers();
-    if (xf86LogFile)  {
-	time_t t;
-	const char *ct;
-	t = time(NULL);
-	ct = ctime(&t);
-	xf86MsgVerb(xf86LogFileFrom, 0, "Log file: \"%s\", Time: %s",
-		    xf86LogFile, ct);
+    if (!xf86DoModalias) {
+	xf86PrintBanner();
+	xf86PrintMarkers();
+	if (xf86LogFile)  {
+	    time_t t;
+	    const char *ct;
+	    t = time(NULL);
+	    ct = ctime(&t);
+	    xf86MsgVerb(xf86LogFileFrom, 0, "Log file: \"%s\", Time: %s",
+			xf86LogFile, ct);
+	}
     }
 
     /* Read and parse the config file */
-    if (!xf86DoProbe && !xf86DoConfigure) {
+    if (!xf86DoProbe && !xf86DoConfigure && !xf86DoModalias) {
       switch (xf86HandleConfigFile(FALSE)) {
       case CONFIG_OK:
 	break;
@@ -644,6 +724,10 @@ InitOutput(ScreenInfo *pScreenInfo, int argc, char **argv)
     if (xf86DoConfigure)
 	DoConfigure();
 
+    /* Do the PCI Access dump */
+    if (xf86DoModalias)
+        DoModalias();
+
     if (autoconfig) {
 	if (!xf86AutoConfig()) {
 	    xf86Msg(X_ERROR, "Auto configuration failed\n");
@@ -1684,6 +1768,12 @@ ddxProcessArgument(int argc, char **argv, int i)
     xf86AllowMouseOpenFail = TRUE;
     return 1;
   }
+  if (!strcmp(argv[i], "-modalias"))
+  {
+    xf86DoModalias = TRUE;
+    xf86AllowMouseOpenFail = TRUE;
+    return 1;
+  }
   if (!strcmp(argv[i], "-isolateDevice"))
   {
     int bus, device, func;
@@ -1723,6 +1813,7 @@ ddxUseMsg()
     ErrorF("-logfile file          specify a log file name\n");
     ErrorF("-configure             probe for devices and write an "__XCONFIGFILE__"\n");
   }
+  ErrorF("-modalias              output a modalias-style filter for each driver installed\n");
   ErrorF("-config file           specify a configuration file, relative to the\n");
   ErrorF("                       "__XCONFIGFILE__" search path, only root can use absolute\n");
   ErrorF("-probeonly             probe for devices, then exit\n");