Hi everyone,
I've been using a Logitech Sphere for years on various projects. This
model is probably from the first batch ever made. In lsusb it shows up
as
046d:08b5 Logitech, Inc. QuickCam Sphere
It's a bit troublesome, because on older kernel versions (~2.4.x,
~2.6.2x) I never had a single issue with this hardware at all, on
several different platforms ranging from x86 to x86_64, to arm
(ep93xx), etc. However, somewhere between then and now, the pwc driver
underwent some changes rendering this device unusable in any recent
kernel. All of my old apps and new apps (including cheese, mplayer,
etc) simply hang indefinitely waiting to read a single frame (using
the v4l2 mmap api). The v4l2 read api also hangs indefinitely (using
pwcgrab). A few of the very old apps that I have also use the v4l1
api, with a 2.4.26 kernel, and that actually works.
I can verify that the hardware itself is fine on windows (also using
very old drivers from Logitech).
Who has been working on this driver? What were the major changes that
have been applied? I'm guessing that the bridge / sensor init sequence
has been messed up somehow. Any ideas?
You're in luck. I fixed this last weekend. It turns out that the
/dev/videoX device is created too soon and the HAL daemon starts to use it
immediately causing some initialization to go wrong or something like
that. Moving the creation of /dev/videoX to the end fixed this issue.
This bug has been there probably for a long time, but it is only triggered
if some other process opens the device node immediately.
Check out the pwc patch I posted last weekend.
Regards,
Hans
Cheers,
Chris
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Hans Verkuil - video4linux developer - sponsored by TANDBERG, part of Cisco
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