ALSA: dice: fix detection of Weiss devices

While most DICE devices keep TCAT's default category ID of 0x04, Weiss
devices identify themselves with 0x00.

Reported-by: Rolf Anderegg <rolf.anderegg@weiss.ch>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 12 insertions, 5 deletions

diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 5f0f102cf5f9..49d630ba2d9f 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -1109,7 +1109,10 @@ static void dice_card_free(struct snd_card *card)
         mutex_destroy(&dice->mutex);
 }
 
-#define DICE_CATEGORY_ID 0x04
+#define OUI_WEISS               0x001c6a
+
+#define DICE_CATEGORY_ID        0x04
+#define WEISS_CATEGORY_ID       0x00
 
 static int dice_interface_check(struct fw_unit *unit)
 {
@@ -1123,15 +1126,15 @@ static int dice_interface_check(struct fw_unit *unit)
         struct fw_device *device = fw_parent_device(unit);
         struct fw_csr_iterator it;
         int key, value, vendor = -1, model = -1, err;
-        unsigned int i;
+        unsigned int category, i;
         __be32 pointers[ARRAY_SIZE(min_values)];
         __be32 version;
 
         /*
          * Check that GUID and unit directory are constructed according to DICE
          * rules, i.e., that the specifier ID is the GUID's OUI, and that the
-         * GUID chip ID consists of the 8-bit DICE category ID, the 10-bit
-         * product ID, and a 22-bit serial number.
+         * GUID chip ID consists of the 8-bit category ID, the 10-bit product
+         * ID, and a 22-bit serial number.
          */
         fw_csr_iterator_init(&it, unit->directory);
         while (fw_csr_iterator_next(&it, &key, &value)) {
@@ -1144,7 +1147,11 @@ static int dice_interface_check(struct fw_unit *unit)
                         break;
                 }
         }
-        if (device->config_rom[3] != ((vendor << 8) | DICE_CATEGORY_ID) ||
+        if (vendor == OUI_WEISS)
+                category = WEISS_CATEGORY_ID;
+        else
+                category = DICE_CATEGORY_ID;
+        if (device->config_rom[3] != ((vendor << 8) | category) ||
             device->config_rom[4] >> 22 != model)
                 return -ENODEV;