[lkml]   [2010]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/1]: input: add support for VirtualBox touchscreen emulation to the Lifebook driver
Hello Dmitry,

Thanks for your comments!

Le mardi 23 février 2010 à 09:58 -0800, Dmitry Torokhov a écrit :
> On Tue, Feb 23, 2010 at 12:13:35PM +0100, Michael Thayer wrote:
> > This patch adds support for VirtualBox touchscreen emulation to the Lifebook
> > input driver.
> I am wondering if it is a good idea to piggy-back on Lifebook. The
> devices are sufficiently different with Lifebook really having 2
> separate devices (touchscreen and either regular external mouse or a
> touchpad) and VirtualBox having asingle device that looks like a pointer
> (not a touchscreen since pointer moves constantly, not while "touching")
> with absolute coordinates reporting.
I'm not sure, if we ended up doing a completely new device, how different it
would end up being. Emulating a touchscreen or a tablet makes sense for us as
these are both something known, which will work with existing systems without
too much tweaking (I could imagine us adding Solaris support at a later point,
and it would be nice to see "little" OSes picking up support independently).

The two devices also make sense for us on the one hand because xf86-input-evdev
currently only understands absolute devices without mouse buttons (yes I know,
we could send them patches too if we had too, but we would rather not patch the
whole world :) ) and on the other because it makes it easy for us to switch
between absolute and relative event reporting, which is a big plus. Of course,
as you point out, we have the unused touch bit, but the device works nicely
sending co-ordinates without "touching", and having at least nominal touch
functionality is rather a prerequisite for emulating a touch screen.

> I think it would be better if we had separate protocol module for that.
> [snip]
Separate module as in separate driver, or changes to the actual (PS/2 extension)
protocol? If the second, then what did you have in mind? One protocol change
I could think of, other than the thing with the buttons, would be a magic knock
rather than DMI matching, as that would let others piggy-back on us. Not a big
advantage for us of course, but it might be one for you.

> This issue should be fixed in the recent kernels.
Ah, I failed to see that (I was working against the Ubuntu Lucid kernel
after checking that there were no more recent changes to lifebook.c).
Is the fix in psmouse-base.c?


Sun Microsystems GmbH Michael Thayer
Werkstrasse 24 VirtualBox engineer
71384 Weinstadt, Germany

Sitz der Gesellschaft:
Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten
Amtsgericht Muenchen: HRB 161028
Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels
Vorsitzender des Aufsichtsrates: Martin Haering

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2010-02-23 21:59    [W:0.049 / U:1.768 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site