USB-Audio: Blacklist iec958 for some USB devices

Some common USB devices are analog only, so prevent the digital
devices from being opened. This simplifies probing the device
in PulseAudio.

I have a "Logitech USB Headset" myself, the "Logitech Web Camera"
was reported by Raymond Yau, and the "Blue Snowball" was reported by
Andy Whitcroft.

Cc: Andy Whitcroft <andy.whitcroft@canonical.com>
Cc: Raymond Yau <superquad.vortex2@gmail.com>
BugLink: https://bugs.launchpad.net/bugs/940145
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/src/conf/cards/USB-Audio.conf b/src/conf/cards/USB-Audio.conf
index 0726c34..d7c121e 100644 (file)
--- a/src/conf/cards/USB-Audio.conf
+++ b/src/conf/cards/USB-Audio.conf
@@ -36,6 +36,11 @@ USB-Audio.pcm.surround40_type {
 # number for the iec958 device can be changed here.
 USB-Audio.pcm.iec958_device {
        # "NoiseBlaster 3000" 42
+
+       # The below don't have digital in/out, so prevent them from being opened.
+       "Logitech USB Headset" 999
+       "Logitech Web Camera" 999
+       "Blue Snowball" 999
 }