Introduce and use BUS_USB

With !155, the device bus ID received via udev is constructed
properly with the "usb:" prefix. But, it is not enough to
make the following line to work in Section "Device":

    BusID  "usb:0:1.2:1.0"

Introduce BUS_USB, so the prefix can be distinguished from BUS_PCI
and check the supplied BusID value against device->attribs->busid
in xf86PlatformDeviceCheckBusID().

Signed-off-by: Böszörményi Zoltán <zboszor@pr.hu>

hw/xfree86/common/xf86Bus.c

@@ -268,6 +268,8 @@ StringToBusType(const char *busID, const char **retID)
         ret = BUS_SBUS;
     if (!xf86NameCmp(p, "platform"))
         ret = BUS_PLATFORM;
+    if (!xf86NameCmp(p, "usb"))
+        ret = BUS_USB;
     if (ret != BUS_NONE)
         if (retID)
             *retID = busID + strlen(p) + 1;

hw/xfree86/common/xf86str.h

@@ -254,6 +254,7 @@ typedef struct _DriverRec {
 #undef BUS_PCI
 #undef BUS_SBUS
 #undef BUS_PLATFORM
+#undef BUS_USB
 #undef BUS_last
 #endif
 
@@ -262,6 +263,7 @@ typedef enum {
     BUS_PCI,
     BUS_SBUS,
     BUS_PLATFORM,
+    BUS_USB,
     BUS_last                    /* Keep last */
 } BusType;
 

hw/xfree86/os-support/linux/lnx_platform.c

@@ -103,6 +103,11 @@ xf86PlatformDeviceCheckBusID(struct xf86_platform_device *device, const char *bu
             return FALSE;
         return TRUE;
     }
+    else if (bustype == BUS_USB) {
+        if (strcasecmp(busid, device->attribs->busid))
+            return FALSE;
+        return TRUE;
+    }
     return FALSE;
 }