1 files changed, 30 insertions, 10 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index d605aff801b8..86f192a3043d 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1809,16 +1809,36 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
 	}
 }
 
-int snd_usb_registration_quirk(struct snd_usb_audio *chip,
-			       int iface)
+/*
+ * registration quirk:
+ * the registration is skipped if a device matches with the given ID,
+ * unless the interface reaches to the defined one.  This is for delaying
+ * the registration until the last known interface, so that the card and
+ * devices appear at the same time.
+ */
+
+struct registration_quirk {
+	unsigned int usb_id;	/* composed via USB_ID() */
+	unsigned int interface;	/* the interface to trigger register */
+};
+
+#define REG_QUIRK_ENTRY(vendor, product, iface) \
+	{ .usb_id = USB_ID(vendor, product), .interface = (iface) }
+
+static const struct registration_quirk registration_quirks[] = {
+	REG_QUIRK_ENTRY(0x0951, 0x16d8, 2),	/* Kingston HyperX AMP */
+	{ 0 }					/* terminator */
+};
+
+/* return true if skipping registration */
+bool snd_usb_registration_quirk(struct snd_usb_audio *chip, int iface)
 {
-	switch (chip->usb_id) {
-	case USB_ID(0x0951, 0x16d8): /* Kingston HyperX AMP */
-		/* Register only when we reach interface 2 so that streams can
-		 * merge correctly into PCMs from interface 0
-		 */
-		return (iface != 2);
-	}
+	const struct registration_quirk *q;
+
+	for (q = registration_quirks; q->usb_id; q++)
+		if (chip->usb_id == q->usb_id)
+			return iface != q->interface;
+
 	/* Register as normal */
-	return 0;
+	return false;
 }