Re: [PATCH] HID: wacom: Report ABS_MISC event for Cintiq Companion Hybrid

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On Thu, 22 Jan 2015, Benjamin Tissoires wrote:

> On Thu, Jan 22, 2015 at 6:53 PM, Jason Gerecke <killertofu@xxxxxxxxx> wrote:
> > It appears that the Cintiq Companion Hybrid does not send an ABS_MISC
> > event to userspace when any of its ExpressKeys are pressed. This is not
> > strictly necessary now that the pad exists on its own device, but
> > should be fixed for consistency's sake.
> >
> > Traditionally both the stylus and pad shared the same device node, and
> > xf86-input-wacom would use ABS_MISC for disambiguation. Not sending this
> > causes the Hybrid to behave incorrectly with xf86-input-wacom beginning with
> > its 8f44f3 commit.
> >
> > Signed-off-by: Jason Gerecke <killertofu@xxxxxxxxx>
> > ---
> > Question: I'd like to write a version of this patch which targets stable
> > releases where the stylus and pad share the device node. How would I go
> > about submitting one, since CCing this patch to stable won't quite do the
> > trick (the patches would have to be against our old home under
> > drivers/input/tablet...)
> 
> IIRC, once this one hits linus tree, you send an adapted version of
> the same patch which refers this one.
> Just add the hash of the final patch in Linus tree, and mention in the
> subject prefix which stable releases you are targeting.

Yup, that's the proper process.

I am therefore not adding Cc: stable explicitly, Jason -- please handle 
this manually once it hits Linus' tree, as it requires manual backport 
anyway.

> See for an example http://thread.gmane.org/gmane.linux.kernel.stable/120947
> 
> >
> >  drivers/hid/wacom_wac.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
> > index a4ba8ca..f886149 100644
> > --- a/drivers/hid/wacom_wac.c
> > +++ b/drivers/hid/wacom_wac.c
> > @@ -783,6 +783,12 @@ static int wacom_intuos_irq(struct wacom_wac *wacom)
> >                         input_report_key(input, BTN_7, (data[4] & 0x40));  /* Left   */
> >                         input_report_key(input, BTN_8, (data[4] & 0x80));  /* Down   */
> >                         input_report_key(input, BTN_0, (data[3] & 0x01));  /* Center */
> > +
> > +                       if (data[4] | (data[3] & 0x01)) {
> > +                               input_report_abs(input, ABS_MISC, PAD_DEVICE_ID);
> > +                       } else {
> > +                               input_report_abs(input, ABS_MISC, 0);
> > +                       }
> 
> I am not 100% sure, but in my memories, the ABS_MISC event was sent
> before any buttons.
> But maybe not.
> 
> Anyway, this is Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>

Thanks. Now applied and pushed out.

-- 
Jiri Kosina
SUSE Labs
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