[PATCH] Subdivide PCI class for aliases

The previous handling of PCI class masks was too primitive: the
class field is not "all or nothing" but has base class, subclass
and interface fields.  This patch changes the alias form from:
pci:vNdNsvNsdNcN to pci:vNdNsvNsdNbcNscNiN.

diff --git a/scripts/file2alias.c b/scripts/file2alias.c
index cdb1e4c6a350b52f7177b8998fa09a95efdeffb5..113ce6e91075a5b06a1febc6c396b6826698fda9 100644 (file)
--- a/scripts/file2alias.c
+++ b/scripts/file2alias.c
@@ -81,10 +81,14 @@ static int do_usb_entry(const char *filename,
        return 1;
 }
 
-/* Looks like: pci:vNdNsvNsdNcN. */
+/* Looks like: pci:vNdNsvNsdNbcNscNiN. */
 static int do_pci_entry(const char *filename,
                        struct pci_device_id *id, char *alias)
 {
+       /* Class field can be divided into these three. */
+       unsigned char baseclass, subclass, interface,
+               baseclass_mask, subclass_mask, interface_mask;
+
        id->vendor = TO_NATIVE(id->vendor);
        id->device = TO_NATIVE(id->device);
        id->subvendor = TO_NATIVE(id->subvendor);
@@ -97,13 +101,26 @@ static int do_pci_entry(const char *filename,
        ADD(alias, "d", id->device != PCI_ANY_ID, id->device);
        ADD(alias, "sv", id->subvendor != PCI_ANY_ID, id->subvendor);
        ADD(alias, "sd", id->subdevice != PCI_ANY_ID, id->subdevice);
-       if (id->class_mask != 0 && id->class_mask != ~0) {
+
+       baseclass = (id->class) >> 16;
+       baseclass_mask = (id->class_mask) >> 16;
+       subclass = (id->class) >> 8;
+       subclass_mask = (id->class_mask) >> 8;
+       interface = id->class;
+       interface_mask = id->class_mask;
+
+       if ((baseclass_mask != 0 && baseclass_mask != 0xFF)
+           || (subclass_mask != 0 && subclass_mask != 0xFF)
+           || (interface_mask != 0 && interface_mask != 0xFF)) {
                fprintf(stderr,
-                       "*** Warning: Can't handle class_mask in %s:%04X\n",
+                       "*** Warning: Can't handle masks in %s:%04X\n",
                        filename, id->class_mask);
                return 0;
        }
-       ADD(alias, "c", id->class_mask == ~0, id->class);
+
+       ADD(alias, "bc", baseclass_mask == 0xFF, baseclass);
+       ADD(alias, "sc", subclass_mask == 0xFF, subclass);
+       ADD(alias, "i", interface_mask == 0xFF, interface);
        return 1;
 }