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From: Jakob Kemi <jakob.kemi@telia.com>
To: joeja@mindspring.com, linux-kernel@vger.kernel.org
Subject: Re: 2.4.14/2.4.15 cpia driver IS broke.. no its parport
Date: Sat, 24 Nov 2001 23:20:12 +0100
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This works perfectly for my w9966 parport webcam!
	/Jakob

On Saturdayen den 24 November 2001 22.43, Jakob Kemi wrote:
> Great!
>
> I'll test it right away.
> 	/Jakob
>
> On Saturdayen den 24 November 2001 22.19, Joe wrote:
> > Okay I have done some more research and found out what is happening!
> > After further testing I have found out that the problem with the parport
> > driver is actually in the ieee1294 code.   One of the changes in the file
> > drivers/parport/ieee1294_ops.c is causing problems.  (for me atleast)
> >
> > The code has changed from calls to parport_frob_control() to calls to
> > parport_write_control ().(Fine)
> >
> > The problem is that in the call to acknowledge the handshake (Event 44?
> > about line592) the call to parport_frob_control or
> > parport_pc_frob_control as it is #defined to is called with a 0 which I
> > think causes the code to call parport_pc_data_forward and the new code
> > just calls
> > parport_pc_data_reverse. I think that we may need to call the
> > parport_pc_data_forward still.
> >
> > -               parport_write_control (port, ctl);   // new code
> > +               parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
> > //old working code
> >
> > Joe
> >
> > > I have been doing some testing and debugging and found out that
> > > something in the 2.4.14 parport driver is breaking my webcam II.  I
> > > have a patch that reverts out all the changes in 2.4.14 parport driver
> > > back to 2.4.13 and the driver now works.  I am going to do some more
> > > testing and see if I can narrow the code down.  Right now the patch is 
> > > about 700+ lines, but reverts out ALL the parport changes.
> > >
> > > My hardward is a VIA chipset (686). It is the ABiT KT7A MB.
> > >
> > > What's happening is that the cpia is being recgonized, but the video
> > > device is not accessable. This is in both 2.4.15 and 2.4.14, with the
> > > creative WebCam II.
> > >
> > > In the /proc/cpia/video0 file it shows the CPIA version as 0.00 instead
> > > of 1.20.
> >
> > -
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