Input device to weston after start

[Keskinarkaus, Teemu]

> -----Original Message-----
> From: Peter Hutterer [mailto:peter.hutterer at who-t.net]
> Sent: 7. joulukuuta 2015 2:13
> To: Pekka Paalanen
> Cc: Keskinarkaus, Teemu; wayland-devel at lists.freedesktop.org
> Subject: Re: Input device to weston after start
>
> On Fri, Dec 04, 2015 at 05:25:35PM +0200, Pekka Paalanen wrote:
> > On Fri, 4 Dec 2015 08:04:55 +0000
> > "Keskinarkaus, Teemu" <Teemu.Keskinarkaus at Maximatecc.com> wrote:
> >
> > > Hi,
> > >
> > > I have a HW with touchscreen that is connected to serial port. I'm
> > > using inputattach to attach the touch to Linux input system. After
> > > that I start Weston and touch works just fine.
> > >
> > > Problem now is that the inputattach takes some time to find/install
> > > the touch device and if I start Weston before that the touch won't
> > > work. This causes delay at startup that now is wanted to be
> > > eliminated. I think the delay in adding the touch device comes from
> > > kernel side so I'm not willing to touch to that if possible to avoid.
> > >
> > > Question now is that is it possible to add input devices to Weston
> > > _after_ it's been started? If so, then how to do it? Simply adding
> > > the device the kernel input system doesn't automatically make it
> > > visible in Weston. Ie. if in my case the inputattach is started
> > > after Weston is started, the touch won't start working.
> >
> > AFAIK Weston is listening on udev events and should be opening input
> > devices as they appear. Perhaps you could compare what happens when
> > hotplugging a normal keyboard or mouse vs. starting inputattach?
> >
> > I suppose one would check if there are any udev events from that, does
> > Weston see them and if so, does something in Weston reject the device,
> > or is Weston never notified about it.
>
> Weston doesn't handle this directly, libinput handles this transparently.
> But since the code is effectively the same for devices seen at startup vs devices
> hotplugged it's a bit odd that there is a difference.
>
> Teemu: please file a bug against libinput and attach the udevadm info output for
> the device. Run libinput-debug-events and check if the DEVICE_ADDED event
> appears after you run inputattach.
>
> Cheers,
>    Peter

It seems that I'm running so old version (Yocto 1.7) that it doesn't have libinput as does the Yocto 1.8 so I'll see if I can update to newer version and if it still doesn't work then file a bug.

-Teemu

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