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From: Jesse Barnes <jbarnes@engr.sgi.com>
To: Jon Smirl <jonsmirl@yahoo.com>
Subject: Re: legacy VGA device requirements (was: Exposing ROM's though sysfs)
Date: Fri, 13 Aug 2004 09:11:29 -0700
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Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
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On Friday, August 13, 2004 8:53 am, Jon Smirl wrote:
> What should the API for this look like? We could add a VGA={0/1}
> attribute to all the VGA devices in sysfs.
>
> But then how do you:
> 1) list all of the conflicting VGA devices in a domain?
> 2) turn off all the VGA devices in a domain?
>
> We could build a bus like directory structure in /sys/class
>
> /sys/class/vga/domain1/vga1/(device/driver/enable)
> /sys/class/vga/domain1/vga2/(device/driver/enable)
> /sys/class/vga/domain2/vga1/(device/driver/enable)
> /sys/class/vga/domain2/vga2/(device/driver/enable)
>
> Then add an enable attribute in the domain directories that would shut
> off all of the subdevices.
>
> /sys/class/vga/domain1/enable
> /sys/class/vga/domain2/enable
>
> But the vga driver is not going to be attached to a device. Is there an
> easy way to build this is sysfs?

Maybe we need a display driver class?  Could we reuse the dri drivers for that 
purpose?

Jesse