Weston 1.8.0: touch input using evdev not working

[Vikas Patil]

Hi Benjamin,

First of all thank a lot for your quick response.

It means since weston 1.7.0 libinput is by default enabled and only the
input backend. I need not to set any specific build switch for it. So in
that case I am using libinput. I thought "BUILD_LIBINPUT_BACKEND" still
exists and as I haven't set it so thought not using libinput.

What do  you mean by we need to fix the kernel? Does that mean libinput
support also requires modification in linux kernel (i.e tocuhscreen driver
or evedev or somethign else)?
How should I start doing this? Do I need to upgrade to latest version of
libudev/libevedev?

Attached here the output of following two commands.

root at linux# evemu-describe /dev/input/event0 > mydevice.desc
root at linux# evemu-record /dev/input/event0 > mydevice.events

Just for information, Touch screen works fine with weston 1.6.0/weston
1.5.0 with this kernel.

Thanks & Regards,
Vikash

On Fri, Sep 25, 2015 at 4:48 PM, Benjamin Tissoires <
benjamin.tissoires at gmail.com> wrote:

> On Fri, Sep 25, 2015 at 2:22 AM, Vikas Patil <vikasmpatil at gmail.com>
> wrote:
> > Dear Members,
> >
> > I am trying Weston 1.8.0 on i.MX6 with Freescale linux 3.14.28 and seems
> > that touch input is not working for me. Weston.log show the following
> > messages. I am not using llibinput backend yet.
>
> That's weird. Since Weston 1.7.0, there are no other backend than
> libinput for handling input devices. Or maybe I am missing something?
>
> >
> > Could anyone give some inputs/suggestion to fix this? Is this due to
> > following ckeck-in?
> >
> >
> http://lists.freedesktop.org/archives/wayland-devel/2015-June/022411.html
> >
>
> Yes it is, but believe me, it is for the better. Your touchscreen is
> not properly tagged by udev, so we need to fix the kernel to make it
> look like a touchscreen that libinput could understand.
>
> >
> >
> > [00:00:50.248] input device 'mxt540e_i2c', /dev/input/event0 not tagged
> as
> > input
> > [00:00:50.248] failed to create input device '/dev/input/event0'.
> > [00:00:50.249] warning: no input devices on entering Weston. Possible
> > causes:
> >         - no permissions to read /dev/input/event*
> >         - seats misconfigured (Weston backend option 'seat', udev device
> > propert
> >
> > I can see “/dev/input/event0” already there and all the touch drivers and
> > dependencies (i.e. mxt540e.ko, input_polldev.ko, evdev.ko) are loaded.
> >
> > root at linux:~# udevadm info /dev/input/event0
> > P: /devices/virtual/input/input0/event0
> > N: input/event0
> > E: DEVNAME=/dev/input/event0
> > E: DEVPATH=/devices/virtual/input/input0/event0
> > E: MAJOR=13
> > E: MINOR=64
> > E: SUBSYSTEM=input
>
> You are missing all the important bits here. For instance, on my
> touchscreen I have:
> $ sudo udevadm info /dev/input/event6
> P: /devices/pci0000:00/INT3433:00/i2c-8/i2c-ATML0001:01/input/input6/event6
> N: input/event6
> S: input/by-path/platform-INT3433:00-event
> E: DEVLINKS=/dev/input/by-path/platform-INT3433:00-event
> E: DEVNAME=/dev/input/event6
> E:
> DEVPATH=/devices/pci0000:00/INT3433:00/i2c-8/i2c-ATML0001:01/input/input6/event6
> E: EVDEV_ABS_00=::10
> E: EVDEV_ABS_01=::10
> E: EVDEV_ABS_35=::10
> E: EVDEV_ABS_36=::10
> E: ID_INPUT=1
> E: ID_INPUT_TOUCHSCREEN=1
> E: ID_PATH=platform-INT3433:00
> E: ID_PATH_TAG=platform-INT3433_00
> E: LIBINPUT_DEVICE_GROUP=18/0/0/0:i2c-8-004b
> E: MAJOR=13
> E: MINOR=70
> E: SUBSYSTEM=input
> E: USEC_INITIALIZED=3206730
>
> The device is tagged with ID_INPUT_TOUCHSCREEN which makes libinput
> handling it.
>
> Could you attach an evemu-record of your touchscreen that we
> understand why udev ignores it?
>
> Cheers,
> Benjamin
>
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