[PATCH] ALSA: usb-audio: Skip probe of UA-101 devices

[PATCH] ALSA: usb-audio: Skip probe of UA-101 devices

[Takashi Iwai]

UA-101 device and co are supported by another driver, snd-ua101, but
the USB audio class driver (snd-usb-audio) catches all and this
resulted in the lack of functionality like missing MIDI devices.

This patch introduces a sort of deny-listing for those devices to just
return -ENODEV at probe in snd-usb-audio driver, so that it falls back
to the probe by snd-ua101.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=212477
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/usb/card.c         |  2 ++
 sound/usb/quirks-table.h | 21 +++++++++++++++++++++
 sound/usb/usbaudio.h     |  1 +
 3 files changed, 24 insertions(+)

diff --git a/sound/usb/card.c b/sound/usb/card.c
index b6f4c0848e66..a482287a2d7f 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -715,6 +715,8 @@ static int usb_audio_probe(struct usb_interface *intf,
 		quirk = get_alias_quirk(dev, id);
 	if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 		return -ENXIO;
+	if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
+		return -ENODEV;
 
 	err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
 	if (err < 0)
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 1165a5ac60f2..1f555d7b7752 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -1674,6 +1674,27 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 		}
 	}
 },
+
+/* UA101 and co are supported by another driver */
+{
+	USB_DEVICE(0x0582, 0x0044), /* UA-1000 high speed */
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_NODEV_INTERFACE
+	},
+},
+{
+	USB_DEVICE(0x0582, 0x007d), /* UA-101 high speed */
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_NODEV_INTERFACE
+	},
+},
+{
+	USB_DEVICE(0x0582, 0x008d), /* UA-101 full speed */
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_NODEV_INTERFACE
+	},
+},
+
 /* this catches most recent vendor-specific Roland devices */
 {
 	.match_flags = USB_DEVICE_ID_MATCH_VENDOR |
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 60b9dd7df6bb..7f91ec1c5646 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -75,6 +75,7 @@ struct snd_usb_audio {
  */
 
 /* special values for .ifnum */
+#define QUIRK_NODEV_INTERFACE		-3	/* return -ENODEV */
 #define QUIRK_NO_INTERFACE		-2
 #define QUIRK_ANY_INTERFACE		-1
 
-- 
2.26.2