linux/sound/usb
Martin Schwenke 1762a59d8e ALSA: usb-audio: Add quirk for Focusrite Scarlett 18i6
Probing this device currently fails in snd_usb_audio_probe() because
the call to snd_usb_create_mixer() fails.  This is due to unknown or
non-standard interface descriptor subtypes in parse_audio_unit():

  usbaudio: unit 51: unexpected type 0x09
  snd-usb-audio: probe of 1-8:1.0 failed with error -5

Some people are working around this by recompiling usb-audio with the
call to snd_usb_create_mixer() commented out.  It would be nice to
avoid that.

While the best idea would be to look into the mixer creation failure,
a reasonable short-term solution is to use quirks to only probe the
trouble-free interfaces.  This allows audio and MIDI interfaces to be
used without any obvious issues.

Interface 0 is the main one to ignore.  It contains lots of
control-fu, including the unexpected interface descriptor subtypes.
Interface 5 is for firmware updates and I'm not sure how to get
support for this.  Interface 3 is some sort of control interface that
I don't understand:

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0
      iInterface              0
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength            9
        bInCollection           1
        baInterfaceNr( 0)       1

Signed-off-by: Martin Schwenke <martin@meltin.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2012-11-13 09:47:13 +01:00
..
6fire ALSA: print small buffers via %*ph[C] 2012-08-06 11:09:50 +02:00
caiaq ALSA: snd-usb-caiaq: initialize card pointer 2012-06-27 12:26:19 +02:00
misc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound 2012-01-12 08:00:30 -08:00
usx2y mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
card.c ALSA: usb-audio: Use rwsem for disconnect protection 2012-10-30 11:07:00 +01:00
card.h ALSA: usb-audio: Fix races at disconnection 2012-10-30 11:06:54 +01:00
clock.c ALSA: snd-usb: fix clock source validity index 2012-08-01 10:24:16 +02:00
clock.h ALSA: usb-audio: simplify control interface access 2010-06-23 16:10:23 +02:00
debug.h ALSA: usb-audio: make hwc_debug a noop in case HW_CONST_DEBUG is not set 2011-05-18 11:44:35 +02:00
endpoint.c ALSA: usb-audio: Fix crash at re-preparing the PCM stream 2012-11-08 08:56:44 +01:00
endpoint.h ALSA: usb-audio: Fix crash at re-preparing the PCM stream 2012-11-08 08:56:44 +01:00
format.c ALSA: usb-audio: avoid integer overflow in create_fixed_stream_quirk() 2012-02-15 14:58:15 +01:00
format.h ALSA: usb-audio: parse more format descriptors with structs 2010-05-27 09:48:31 +02:00
helper.c ALSA: snd-usb: Add quirks for Playback Designs devices 2012-09-04 11:31:14 +02:00
helper.h ALSA: usb-audio: increase control transfer timeout 2011-09-27 09:21:48 +02:00
Kconfig ALSA: sound/usb: remove CONFIG_EXPERIMENTAL 2012-10-25 00:17:47 +02:00
Makefile ALSA: snd-usb: move code from urb.c to endpoint.c 2011-09-14 17:07:03 +02:00
midi.c sound: Add module.h to the previously silent sound users 2011-10-31 19:31:21 -04:00
midi.h ALSA: usb-audio: add support for Akai MPD16 2010-05-21 17:12:30 +02:00
mixer_maps.c ALSA: snd_usb_audio: ignore ctrl errors on QuickCam Pro for Notebooks 2012-06-20 08:29:08 +02:00
mixer_quirks.c ALSA: usb-audio: Fix races at disconnection in mixer_quirks.c 2012-10-30 11:07:05 +01:00
mixer_quirks.h ALSA: usb-mixer: factor out quirks 2010-03-12 12:20:26 +01:00
mixer.c ALSA: usb-audio: Use rwsem for disconnect protection 2012-10-30 11:07:00 +01:00
mixer.h ALSA: usb-audio: Rename and export mixer_vol_tlv 2012-04-24 08:01:27 +02:00
pcm.c Merge branch 'for-linus' into for-next 2012-11-08 15:58:25 +01:00
pcm.h ALSA: usb: refine delay information with USB frame counter 2011-09-12 10:30:20 +02:00
power.h ALSA: usbaudio: implement USB autosuspend 2011-03-11 14:59:29 +01:00
proc.c ALSA: usb-audio: Fix races at disconnection 2012-10-30 11:06:54 +01:00
proc.h ALSA: usb-audio: refactor code 2010-03-05 08:17:14 +01:00
quirks-table.h ALSA: usb-audio: Add quirk for Focusrite Scarlett 18i6 2012-11-13 09:47:13 +01:00
quirks.c ALSA: snd-usb: Add quirks for Playback Designs devices 2012-09-04 11:31:14 +02:00
quirks.h ALSA: snd-usb: Add quirks for Playback Designs devices 2012-09-04 11:31:14 +02:00
stream.c ALSA: usb-audio: Fix races at disconnection 2012-10-30 11:06:54 +01:00
stream.h ALSA: snd-usb: re-order code 2011-09-14 17:07:02 +02:00
usbaudio.h ALSA: usb-audio: Use rwsem for disconnect protection 2012-10-30 11:07:00 +01:00