linux-kernel - Re: [PATCH] hid-multitouch: Fix Iiyama ProLite T1931SAW (0eef:0001 again!)

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Date:   Tue, 16 Nov 2021 10:11:40 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Ondrej Zary <linux@...y.sk>
Cc:     Jiri Kosina <jikos@...nel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hid-multitouch: Fix Iiyama ProLite T1931SAW (0eef:0001 again!)

On Mon, Nov 15, 2021 at 9:37 AM Ondrej Zary <linux@...y.sk> wrote:
>
> On Friday 12 November 2021, Benjamin Tissoires wrote:
> > Hi Ondrej,
> >
> > On Fri, Nov 12, 2021 at 3:00 PM Ondrej Zary <linux@...y.sk> wrote:
> > >
> > > Iiyama ProLite T1931SAW does not work with Linux - input devices are
> > > created but cursor does not move.
> > >
> > > It has the infamous 0eef:0001 ID which has been reused for various
> > > devices before.
> > >
> > > It seems to require export_all_inputs = true.
> > > Add it to mt_devices[] as MT_CLS_WIN_8 to fix the problem.
> > > Hopefully there are no HID devices using this ID that will break.
> > > It should not break non-HID devices (handled by usbtouchscreen).
> >
> > Hmm, this is worrisome. I am pretty sure there were some eGalax 0001
> > devices that were Win 7 compatible and I am not sure if they are
> > compatible with Win8...
> >
> > I guess that if you have to set MT_CLS_WIN_8, the device is not
> > detected as such. so how about you use:
> > MT_CLS_EXPORT_ALL_INPUTS instead, (to keep MT_CLS_DEFAULT for those
> > devices), and restrict the VID/PID matching to the non Win8 devices:
>
> It works with MT_CLS_EXPORT_ALL_INPUTS.
>
> > HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, USB_VENDOR_ID_DWAV,
> > USB_DEVICE_ID_EGALAX_TOUCHCONTROLLER)
>
> But does not match HID_GROUP_GENERIC.

Sorry, it should have been HID_GROUP_MULTITOUCH

Cheers,
Benjamin

>
> >
> > ?
> >
> > Cheers,
> > Benjamin
> >
> > >
> > > Signed-off-by: Ondrej Zary <linux@...y.sk>
> > > ---
> > >  drivers/hid/hid-multitouch.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > >
> > > diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> > > index e1afddb7b33d..099daf590392 100644
> > > --- a/drivers/hid/hid-multitouch.c
> > > +++ b/drivers/hid/hid-multitouch.c
> > > @@ -1888,6 +1888,11 @@ static const struct hid_device_id mt_devices[] = {
> > >                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
> > >                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
> > >
> > > +       /* eGalax devices (SAW) */
> > > +       { .driver_data = MT_CLS_WIN_8,
> > > +               MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
> > > +                       USB_DEVICE_ID_EGALAX_TOUCHCONTROLLER) },
> > > +
> > >         /* eGalax devices (resistive) */
> > >         { .driver_data = MT_CLS_EGALAX,
> > >                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
> > > --
> > > Ondrej Zary
> > >
> >
> >
>
>
>
> --
> Ondrej Zary
>