At Mon, 11 Mar 2013 20:15:34 +0100, Clemens Ladisch wrote: > > >> David Helstroom wrote: > >>> Interface 1 does not exist > > Please try the patch below.
Since the patch seems working, I merge it now. thanks, Takashi > > > Regards, > Clemens > > > --8<---------------------------------------------------------------->8-- > ALSA: usb-audio: add a workaround for the NuForce UDH-100 > > 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-by: Dave Helstroom <[email protected]> > Signed-off-by: Clemens Ladisch <[email protected]> > --- > sound/usb/card.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/sound/usb/card.c b/sound/usb/card.c > index df2f6d0..34dc3e8 100644 > --- a/sound/usb/card.c > +++ b/sound/usb/card.c > @@ -245,6 +245,21 @@ static int snd_usb_create_streams(struct snd_usb_audio > *chip, int ctrlif) > 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; > } > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
