[ALSA] usb-audio: add UM-1EX/UM-2EX information

Modules: USB generic driver

Add comments with information about UM-1EX/UM-2EX devices.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/sound/usb/usbquirks.h b/sound/usb/usbquirks.h
index edb88871ff4a..bb7829cf98dc 100644
--- a/sound/usb/usbquirks.h
+++ b/sound/usb/usbquirks.h
@@ -294,7 +294,8 @@ YAMAHA_DEVICE(0x7010, "UB99"),
         }
 },
 {
-        /* a later revision uses ID 0x0099 */
+        /* Has ID 0x0099 when not in "Advanced Driver" mode.
+         * The UM-2EX has only one input, but we cannot detect this. */
         USB_DEVICE(0x0582, 0x0005),
         .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
                 .vendor_name = "EDIROL",
@@ -385,7 +386,7 @@ YAMAHA_DEVICE(0x7010, "UB99"),
         }
 },
 {
-        /* a later revision uses ID 0x009d */
+        /* has ID 0x009d when not in "Advanced Driver" mode */
         USB_DEVICE(0x0582, 0x0009),
         .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
                 .vendor_name = "EDIROL",