On November 3, 2017 2:23:10 PM PDT, Benjamin Tissoires <benjamin.tissoi...@gmail.com> wrote: >On Fri, Nov 3, 2017 at 9:15 PM, Aaron Armstrong Skomra ><sko...@gmail.com> wrote: >> >> >> On Fri, Nov 3, 2017 at 7:19 AM, Benjamin Tissoires >> <benjamin.tissoi...@gmail.com> wrote: >>> >>> The Dell canvas 27 is an external monitor with pen and touch, but >the >>> pen is provided by Wacom, and the touch by Advanced Silicon. >>> To have proper touch arbitration, we need to force xf86-input-wacom >>> to also handle the touch part. >>> >>> Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@gmail.com> >>> --- >>> conf/70-wacom.conf | 9 +++++++++ >>> 1 file changed, 9 insertions(+) >>> >>> diff --git a/conf/70-wacom.conf b/conf/70-wacom.conf >>> index a20e3a3..86a3f90 100644 >>> --- a/conf/70-wacom.conf >>> +++ b/conf/70-wacom.conf >>> @@ -101,3 +101,12 @@ Section "InputClass" >>> Driver "wacom" >>> Option "Button2" "3" >>> EndSection >>> + >>> +# Dell Canvas 27 (touch part is an Advanced Silicon, pen part a >Wacom) >>> +Section "InputClass" >>> + Identifier "Dell Canvas 27 Touch" >>> + MatchUSBID "2575:0204" >>> + MatchDevicePath "/dev/input/event*" >>> + MatchIsTouchscreen "true" >>> + Driver "wacom" >>> +EndSection >>> -- >>
Patch looks sensible enough: Reviewed-By: Jason Gerecke <jason.gere...@wacom.com> >> >> >> HI Benjamin, >> >> I know that the last display device that I added support for required >> changes to wcmUSB.c and >> wcmValidateDevice.c [1] for Centos 6. > >Oh... I thought the xorg wacom driver was now smart enough to not >require such changes... > The driver can auto detect most of this stuff, but some data is not available from the RHEL6 kernel (off the top of my head, the axis resolution and touchscreen/touchpad prop). An entry would need to be added for full compatibility. That said, the situation is somewhat moot on RHEL6 since there isn't yet an input-wacom or kernel patch to support the pen. Until such a patch comes into existence, users can just remove this xorg.conf.d option to have the evdev driver control the touchscreen instead. >> >> I'm not very familiar with the x driver conf files, so it may be that >this >> also accomplishes >> the same thing by another means. > >I'd say it's different. Here my patch just forces the Advanced Silicon >touchscreen to be handled by xf86-input-wacom so the xorg driver can >do touch arbitration. >Your patch tweaks the tablet so that it is usable from the application >point of view. >We might need such changes also :/ > >> If you're just aiming for Centos 7 support, >> or if you know >> this conf file also works for Centos 6 this seems fine. Otherwise the >driver >> probably needs changes >> similar to the commit below to support this device. If you'd like me >to work >> on that, let me know and I'll >> see if I can find a device. > >I'd be happy if you could have a look at the device itself. Note that >you need a kernel patch for it to report accurate coordinates [2]. >But one solution could be to teach me what to check and I'll assess >myself if we need changes in those files too. > >BTW, from my engineer point of view, I doubt we will be able to >officially support it in CentOS 6. This requires a change in the >kernel that depends on too many others (basically the whole HID >stack). But this is not a Red Hat statement, just my wish that we >should push back any request coming for this device on RHEL 6 :) > There's also the option of having an existing/new IRQ function in wacom_wac.c decode the reports without the benefit of HID like we currently do for such old input-wacom backports. Of course, it's fine to not bother with that until it becomes necessary. Tangentially, I'd like data for this pair of devices added to the wacom-hid-descriptors repository. The sysinfo.sh script should be updated to detect the touch VID:PID first though. Jason >Cheers, >Benjamin > >[2] https://patchwork.kernel.org/patch/10040899/ > >> >> Best, >> Aaron >> >> [1] >> >https://sourceforge.net/p/linuxwacom/xf86-input-wacom/ci/b0a055425dfb983163b1d3c673a36aebf9536430/ >>> >>> 2.13.6 >>> >>> >>> >>> >------------------------------------------------------------------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Linuxwacom-devel mailing list >>> Linuxwacom-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel >> >> -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linuxwacom-devel mailing list Linuxwacom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
