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From: root@mauve.demon.co.uk
Message-Id: <200307161410.PAA04171@mauve.demon.co.uk>
Subject: Re: [RFC/PATCH] sysfs'ify video4linux
To: mark@alpha.dyndns.org (Mark McClelland)
Date: Wed, 16 Jul 2003 15:10:22 +0100 (BST)
Cc: greg@kroah.com (Greg KH), kraxel@bytesex.org (Gerd Knorr),
       linux-kernel@vger.kernel.org (Kernel List),
       video4linux-list@redhat.com (video4linux list)
In-Reply-To: <3F15540E.2040405@alpha.dyndns.org> from "Mark McClelland" at Jul 16, 2003 06:33:02 AM
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> 
> Greg KH wrote:
> 
> >On Tue, Jul 15, 2003 at 04:31:19PM +0200, Gerd Knorr wrote:
> >  
> >
> >>Changes required/recommended in video4linux drivers:
> >>
> >>  * some usb webcam drivers (usbvideo.ko, stv680.ko, se401.ko 
> >>    and ov511.ko) use the video_proc_entry() to add additional
> >>    procfs files.  These drivers must be converted to sysfs too
> >>    because video_proc_entry() doesn't exist any more.
<snip>
> >Is there any need for these drivers to export anything through sysfs now
> >instead of /proc?
> >
> 
> Yes, at least with ov511. Some of the info that it puts in /proc is no 
> longer necessary. However, there are various bits of hardware info that 
> still need to get to userspace, for scripts that need to tell otherwise 
> identical (same VID/PID/revision) cameras apart when creating /dev nodes.

Also, there is some other information that scripts need.
Exposure gives information about light levels, which can be used to 
compute the absolute brightness of a scene captured.