Hi all,

During the implementation of Xorg VT (virtual console) support,
a problem has been discovered when Xorg physically opens a USB
keyboard (/dev/usb/hid*).

By default Xorg on Solaris opens the virtual keyboard device
(/dev/kbd). The virtual keyboard (conskbd) creates two minor nodes
thus has two streams. One is the internal minor node which is linked
under console stream, the other is /dev/kbd which is for the use
of applications.
Say Xorg is running on /dev/vt/7, when /dev/vt/7 is made active,
Xorg uses KIOCSDIRECT to route conskbd IO to /dev/kbd stream.
And it will route the IO back when switching away to consoles.

HID driver creates two minor nodes for a USB keyboard too.
One minor node is internal used and the stream is plumbed under
conskbd, the other is /dev/usb/hidx.
When Xorg is configured to open /dev/usb/hidx as keyboard device,
the internal stream is unplugged from conskbd automatically.
So when switching from Xorg session back to console session, the
console will not get any input from this keyboard.
And Xorg can not close /dev/usb/hidx, since it has already dropped
the privilege and running as a normal user at this moment. If Xorg
closes /dev/usb/hidx when switching away, it loses the privilege
to reopen the keyboard device when switching back.

So the proposal here is to add a new ioctl to the hid driver for
keyboard devices which has the similar routing functionality as
KIOCSDIRECT does to conskbd driver.

Before I am preparing any official documents, I would like to
discuss it with the following purposes:

1) Is there any existing way to resolve this?
2) Is there any better solution?

Edward and Alan, your comments are more than welcomed.

Thanks a lot.
Aaron

-- 
You know some birds are not meant to be caged, their feathers are just too 
bright.

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