Add Rotate support to a driver

[yoni dana]

On Fri, May 14, 2010 at 2:16 AM, Peter Hutterer
<peter.hutterer at who-t.net> wrote:
> On Thu, May 13, 2010 at 10:30:17PM +0300, yoni dana wrote:
>> Thanks for the reply. I am writing an x11 input driver. I have a
>> looked at some x11 input driver
>> and didn't see the XRRScreenChangeNotify  function, is there another way
>> i can detect screen rotation so i can swap between X and Y coordinate
>> thank you
>
> you need to write an X client (== application) to handle this situation.
> input drivers don't have access to these events directly, so you won't find
> any code in evdev/synaptics/... do handle this.
>
> the order of events is
> user triggers rotation
>   X server rotates
>   X server sends RRNotify events
>        your client receives event
>        your client triggers input rotation
>            input driver rotates.
>
> one question I have to ask you though - why are you writing an input driver?
> there's a good chance that the device may be supported by evdev (of if not,
> should be supported in the kernel instead). That's if you're on linux
> anyway.
>
> Cheers,
>  Peter
>
>> i have look at the synaptic and evdev driver and didn't see
>> XRRScreenChangeNotify
>> function, is there another wahy
>> On Wed, May 12, 2010 at 12:52 PM, Éric Piel <E.A.B.Piel at tudelft.nl> wrote:
>> > Op 12-05-10 07:39, yoni dana schreef:
>> >> Hi
>> >> i have implemented and X11 input driver,
>> >> i need to add support to screen rotation,
>> >> My questions is
>> >> How can i detect screen rotation occurred
>> >> (For Example i use xrandr -o left )
>> > I think you can do this in a X client which listens to the
>> > XRRScreenChangeNotify event on the root window. See the Xrandr(3) man
>> > page for more info. Then, your client can request a change of
>> > orientation to the input via an input property.
>> >
>> > Eric
>> >
>

Hi
Thanks Peter for the reply, i have wrote a kernel driver,
i will check if i can user evdev as an X11 input driver.
My question if how can i triger the input driver to roate.
which signal / command i have to send to the X11.