linux-kernel - Re: [PATCH][RESEND] Add a USB audio quirk for the NuForce UDH-100 device.

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Date:	Mon, 11 Mar 2013 11:03:42 -0700
From:	Dave Helstroom <helstroom@...gle.com>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	perex@...ex.cz, tiwai@...e.de, eldad@...refinery.com,
	damien@...audio.com, pete.leigh@...il.com,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RESEND] Add a USB audio quirk for the NuForce UDH-100 device.

On 11 March 2013 01:32, Clemens Ladisch <clemens@...isch.de> wrote:
> David Helstroom wrote:
>> Interface 1 does not exist
>
> Then it doesn't need a quirk, does it?

Perhaps that's the case. I just know that without
QUIRK_IGNORE_INTERFACE for ifnum 1, the kernel refuses to properly
configure the output device. From dmesg without this patch:
[ 3254.192225] usb 1-1: new high-speed USB device number 6 using ehci_hcd
[ 3254.343554] usb 1-1: config 1 has an invalid interface number: 3 but max is 2
[ 3254.343558] usb 1-1: config 1 has an invalid interface number: 3 but max is 2
[ 3254.343562] usb 1-1: config 1 has an invalid interface number: 3 but max is 2
[ 3254.343565] usb 1-1: config 1 has an invalid interface number: 3 but max is 2
[ 3254.343568] usb 1-1: config 1 has no interface number 1
[ 3254.345988] input: Nuforce Inc., Nuforce 192k USB DAC as
/devices/pci0000:00/0000:00:1a.7/usb1/1-1/1-1:1.0/input/input10
[ 3254.346202] generic-usb 0003:16D0:0631.0007: input,hidraw0: USB HID
v1.00 Device [Nuforce Inc., Nuforce 192k USB DAC] on
usb-0000:00:1a.7-1/input0
[ 3254.355970] Audio class v2 interfaces need an interface association
[ 3254.355988] snd-usb-audio: probe of 1-1:1.2 failed with error -5
[ 3254.356045] usbcore: registered new interface driver snd-usb-audio

>> and Interface 0 should be ignored.
>
> Why?
>
> If the driver doesn't like something in interface 0, that bug should be
> fixed.
>
> What is the output of "lsusb -v" for this device?

I've put up the relevant output on: http://pastebin.com/i4wpQ35B
Note that I'm testing on an older kernel here (3.2.5), so perhaps a
more fundamental fix has already made its way into the USB audio
stack. I'll arrange to test on a more recent kernel too.
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