linux-kernel - Re: [alsa-devel] [PATCH] Jabra SPEAK 410 USB

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Date:	Fri, 16 Dec 2011 19:12:10 +0000
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	alsa-devel@...a-project.org, Tom Walder <tom.walder@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] Jabra SPEAK 410 USB - no audio playback

On Fri, Dec 16, 2011 at 02:49:05PM +0100, Clemens Ladisch wrote:
> Richard W.M. Jones wrote:
> > The attached patch fixes USB audio support for the Jabra SPEAK 410 USB.
> >
> > The problem, as I understand it, is that the device contains a
> > Class-Specific Endpoint (CS_ENDPOINT) descriptor before the Endpoint
> > (ENDPOINT) descriptor.  The USB code all assumes that CS_ENDPOINT can
> > only appear after ENDPOINT.  Therefore the USB code divides up the
> > interface descriptor into "stuff before ENDPOINT" (in
> > interface->extra) and "stuff after ENDPOINT" (in
> > interface->endpoint[0]->extra).  For this device, this division does
> > not work.
> >
> > The solution (which is a hack ...) is to also search interface->extra
> > looking for the missing descriptor.
> 
> The patch looks good.  Please run it through checkpatch.pl and provice
> a Signed-off-by tag (see Documentation/SubmittingPatches).

Sorry, I should have followed up on this list ...

Tom (in the CC line) opened a bug with Jabra, and they have issued a
firmware update.  Unfortunately this update requires some Windows
software to run.  I applied this, and it does appear to fix the audio
playback problem, though curiously it doesn't completely fix the
ENDPOINT/CS_ENDPOINT problem, so who knows what's really going on
there.

Anyway, should you want the update it is here:

https://bugzilla.redhat.com/show_bug.cgi?id=766714#c1

Thanks Tom!

Rich.

-- 
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