#define HDSPM_DMA_AREA_BYTES (HDSPM_MAX_CHANNELS * HDSPM_CHANNEL_BUFFER_BYTES)
 #define HDSPM_DMA_AREA_KILOBYTES (HDSPM_DMA_AREA_BYTES/1024)
 
-/* revisions >= 230 indicate AES32 card */
-#define HDSPM_MADI_ANCIENT_REV 204
-#define HDSPM_MADI_OLD_REV     207
-#define HDSPM_MADI_REV         210
 #define HDSPM_RAYDAT_REV       211
 #define HDSPM_AIO_REV          212
 #define HDSPM_MADIFACE_REV     213
-#define HDSPM_AES_REV          240
-#define HDSPM_AES32_REV                234
-#define HDSPM_AES32_OLD_REV    233
 
 /* speed factor modes */
 #define HDSPM_SPEED_SINGLE 0
        strcpy(card->driver, "HDSPM");
 
        switch (hdspm->firmware_rev) {
-       case HDSPM_MADI_REV:
-       case HDSPM_MADI_OLD_REV:
-       case HDSPM_MADI_ANCIENT_REV:
-               hdspm->io_type = MADI;
-               hdspm->card_name = "RME MADI";
-               hdspm->midiPorts = 3;
-               break;
        case HDSPM_RAYDAT_REV:
                hdspm->io_type = RayDAT;
                hdspm->card_name = "RME RayDAT";
                hdspm->card_name = "RME MADIface";
                hdspm->midiPorts = 1;
                break;
-       case HDSPM_AES_REV:
-       case HDSPM_AES32_REV:
-       case HDSPM_AES32_OLD_REV:
-               hdspm->io_type = AES32;
-               hdspm->card_name = "RME AES32";
-               hdspm->midiPorts = 2;
-               break;
        default:
-               snd_printk(KERN_ERR "HDSPM: unknown firmware revision %x\n",
+               if ((hdspm->firmware_rev == 0xf0) ||
+                       ((hdspm->firmware_rev >= 0xe6) &&
+                                       (hdspm->firmware_rev <= 0xea))) {
+                       hdspm->io_type = AES32;
+                       hdspm->card_name = "RME AES32";
+                       hdspm->midiPorts = 2;
+               } else if ((hdspm->firmware_rev == 0xd5) ||
+                       ((hdspm->firmware_rev >= 0xc8)  &&
+                               (hdspm->firmware_rev <= 0xcf))) {
+                       hdspm->io_type = MADI;
+                       hdspm->card_name = "RME MADI";
+                       hdspm->midiPorts = 3;
+               } else {
+                       snd_printk(KERN_ERR
+                               "HDSPM: unknown firmware revision %x\n",
                                hdspm->firmware_rev);
-               return -ENODEV;
+                       return -ENODEV;
+               }
        }
 
        err = pci_enable_device(pci);