linux-kernel - PWC webcam and setpwc tool no longer working with 3.12.11 kernel

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Date:	Thu, 20 Feb 2014 11:30:26 -0800 (PST)
From:	Chris Rankin <rankincj@...oo.com>
To:	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: PWC webcam and setpwc tool no longer working with 3.12.11 kernel

Hi,

I have an old Logitech webcam, with USB IDs 046d:08b3. When I try to use this camera now, I see this error in the dmesg log:

[ 2883.852464] pwc: isoc_init() submit_urb 0 failed with error -28

This error is apparently ENOSPC, which made me suspect that I was trying to use a mode that would require compression. However, when I tried using setpwc to configure the camera's options I received more errors:
$ setpwc -c 3
setpwc v1.3, (C) 2003-2006 by folkert@...heusden.com
Error while doing ioctl VIDIOCPWCSCQUAL: Inappropriate ioctl for device

Has the kernel-to-userspace interface for PWC devices changed? Because how else could this IOCTL be "inappropriate"? Is there an alternative to setpwc, please?

Thanks,
Chris
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