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ALSA: usb-audio: add a workaround for the NuForce UDH-100

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The NuForce UDH-100 numbers its interfaces incorrectly, which makes the
interface associations come out wrong, which results in the driver
erroring out with the message "Audio class v2 interfaces need an
interface association".

Work around this by searching for the interface association descriptor
also in some other place where it might have ended up.

Reported-and-tested-by: Dave Helstroom <helstroom@google.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2013-03-11 20:15:34 +01:00 committed by Takashi Iwai
parent 2e9b9a3c24
commit 281a6ac0f5
1 changed files with 15 additions and 0 deletions
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15
sound/usb/card.c
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@ -243,6 +243,21 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
struct usb_interface_assoc_descriptor *assoc =
usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
if (!assoc) {
/*
* Firmware writers cannot count to three. So to find
* the IAD on the NuForce UDH-100, also check the next
* interface.
*/
struct usb_interface *iface =
usb_ifnum_to_if(dev, ctrlif + 1);
if (iface &&
iface->intf_assoc &&
iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
assoc = iface->intf_assoc;
}
if (!assoc) {
snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
return -EINVAL;