linux-kernel - Re: [PATCH] HID: multitouch: enable multi-input as a quirk for some devices

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Date:   Wed, 27 May 2020 11:22:34 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        "open list:INTEL INTEGRATED SENSOR HUB DRIVER" 
        <linux-input@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "3.8+" <stable@...r.kernel.org>
Subject: Re: [PATCH] HID: multitouch: enable multi-input as a quirk for some devices

On Wed, May 27, 2020 at 8:18 AM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
>
>
> > On May 26, 2020, at 23:07, Benjamin Tissoires <benjamin.tissoires@...hat.com> wrote:
> >
> > Two touchpad/trackstick combos are currently not behaving properly.
> > They define a mouse emulation collection, as per Win8 requirements,
> > but also define a separate mouse collection for the trackstick.
> >
> > The way the kernel currently treat the collections is that it
> > merges both in one device. However, given that the first mouse
> > collection already defines X,Y and left, right buttons, when
> > mapping the events from the second mouse collection, hid-multitouch
> > sees that these events are already mapped, and simply ignores them.
> >
> > To be able to report events from the tracktick, add a new quirked
> > class for it, and manually add the 2 devices we know about.
> >
> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=207235
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>
> Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Thanks for the very fast testing :)

Pushed to for-5.8/multitouch given that we already are at 5.7-rc7, we
might as well postpone it for one week.

Cheers,
Benjamin

>
> > ---
> > drivers/hid/hid-multitouch.c | 26 ++++++++++++++++++++++++++
> > 1 file changed, 26 insertions(+)
> >
> > diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> > index 03c720b47306..39e4da7468e1 100644
> > --- a/drivers/hid/hid-multitouch.c
> > +++ b/drivers/hid/hid-multitouch.c
> > @@ -69,6 +69,7 @@ MODULE_LICENSE("GPL");
> > #define MT_QUIRK_ASUS_CUSTOM_UP               BIT(17)
> > #define MT_QUIRK_WIN8_PTP_BUTTONS     BIT(18)
> > #define MT_QUIRK_SEPARATE_APP_REPORT  BIT(19)
> > +#define MT_QUIRK_FORCE_MULTI_INPUT   BIT(20)
> >
> > #define MT_INPUTMODE_TOUCHSCREEN      0x02
> > #define MT_INPUTMODE_TOUCHPAD         0x03
> > @@ -189,6 +190,7 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app);
> > #define MT_CLS_WIN_8                          0x0012
> > #define MT_CLS_EXPORT_ALL_INPUTS              0x0013
> > #define MT_CLS_WIN_8_DUAL                     0x0014
> > +#define MT_CLS_WIN_8_FORCE_MULTI_INPUT               0x0015
> >
> > /* vendor specific classes */
> > #define MT_CLS_3M                             0x0101
> > @@ -279,6 +281,15 @@ static const struct mt_class mt_classes[] = {
> >                       MT_QUIRK_CONTACT_CNT_ACCURATE |
> >                       MT_QUIRK_WIN8_PTP_BUTTONS,
> >               .export_all_inputs = true },
> > +     { .name = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
> > +             .quirks = MT_QUIRK_ALWAYS_VALID |
> > +                     MT_QUIRK_IGNORE_DUPLICATES |
> > +                     MT_QUIRK_HOVERING |
> > +                     MT_QUIRK_CONTACT_CNT_ACCURATE |
> > +                     MT_QUIRK_STICKY_FINGERS |
> > +                     MT_QUIRK_WIN8_PTP_BUTTONS |
> > +                     MT_QUIRK_FORCE_MULTI_INPUT,
> > +             .export_all_inputs = true },
> >
> >       /*
> >        * vendor specific classes
> > @@ -1714,6 +1725,11 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> >       if (id->group != HID_GROUP_MULTITOUCH_WIN_8)
> >               hdev->quirks |= HID_QUIRK_MULTI_INPUT;
> >
> > +     if (mtclass->quirks & MT_QUIRK_FORCE_MULTI_INPUT) {
> > +             hdev->quirks &= ~HID_QUIRK_INPUT_PER_APP;
> > +             hdev->quirks |= HID_QUIRK_MULTI_INPUT;
> > +     }
> > +
> >       timer_setup(&td->release_timer, mt_expired_timeout, 0);
> >
> >       ret = hid_parse(hdev);
> > @@ -1926,6 +1942,11 @@ static const struct hid_device_id mt_devices[] = {
> >               MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
> >                       USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C002) },
> >
> > +     /* Elan devices */
> > +     { .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
> > +             HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
> > +                     USB_VENDOR_ID_ELAN, 0x313a) },
> > +
> >       /* Elitegroup panel */
> >       { .driver_data = MT_CLS_SERIAL,
> >               MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
> > @@ -2056,6 +2077,11 @@ static const struct hid_device_id mt_devices[] = {
> >               MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
> >                       USB_DEVICE_ID_MTP_STM)},
> >
> > +     /* Synaptics devices */
> > +     { .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
> > +             HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
> > +                     USB_VENDOR_ID_SYNAPTICS, 0xce08) },
> > +
> >       /* TopSeed panels */
> >       { .driver_data = MT_CLS_TOPSEED,
> >               MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
> > --
> > 2.25.1
> >
>