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[ALSA] usb-audio: explicitly match Logitech QuickCam 

Commit 93c8bf45e0 modified the USB device
matching behaviour to ignore interface class matches if the device class
is vendor-specific.
This patch adds explicit ID matches for Logitech QuickCam devices, which
have a vendor specific device class (but standards-compliant audio
interfaces).
This fixes a 2.6.20 regression where the audio component of these
devices was no longer usable.
http://bugs.gentoo.org/show_bug.cgi?id=175715
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/93822
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3040
Based on a patch from sergiom

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Daniel Drake 2007-05-07 09:27:05 +02:00 committed by Jaroslav Kysela
parent d427c77eb2
commit a91214589e
1 changed files with 23 additions and 0 deletions
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23
sound/usb/usbquirks.h
View File

@ -39,6 +39,29 @@
.idProduct = prod, \
.bInterfaceClass = USB_CLASS_VENDOR_SPEC
/*
* Logitech QuickCam: bDeviceClass is vendor-specific, so generic interface
* class matches do not take effect without an explicit ID match.
*/
{
.match_flags = USB_DEVICE_ID_MATCH_DEVICE |
USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS,
.idVendor = 0x046d,
.idProduct = 0x08f0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL
},
{
.match_flags = USB_DEVICE_ID_MATCH_DEVICE |
USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS,
.idVendor = 0x046d,
.idProduct = 0x08f6,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL
},
/*
* Yamaha devices
*/