linux-kernel - Re: [PATCH v2 02/30] HID: wacom: store the type in wacom->shared for INTUOSHT and INTUOSHT2

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Date:	Mon, 18 Jul 2016 16:54:38 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Ping Cheng <pinglinux@...il.com>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Jason Gerecke <killertofu@...il.com>,
	Aaron Skomra <skomra@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-input <linux-input@...r.kernel.org>
Subject: Re: [PATCH v2 02/30] HID: wacom: store the type in wacom->shared for
 INTUOSHT and INTUOSHT2

On Jul 14 2016 or thereabouts, Ping Cheng wrote:
> On Wed, Jul 13, 2016 at 9:05 AM, Benjamin Tissoires
> <benjamin.tissoires@...hat.com> wrote:
> > The type is never set but we check for it in wacom_wireless_irq().
> 
> Type was assigned in wacom_wireless_work [1] before we moved code
> around. It somehow failed to get into wacom_parse_and_register. The
> value was only assigned once on stylus interface. It was unnecessary
> to assign it again on touch interface since it is a shared value.
> Maybe that was the reason it missed its "flight"?

Yeah, sorry I have seen that my patch removed it a while ago and that no
one actually reported it as an issue.

> 
> [1] https://git.kernel.org/cgit/linux/kernel/git/dtor/input.git/commit/drivers/hid/wacom_sys.c?id=2546dacd3e0e48c40bbb99caf01455f1ade9bb24
> 
> > It looks like this is a big hack from the beginning, so fill in the gap
> > only.
> 
> Yeah, wireless is a dynamic connection. We can not tell which tablet
> model is going to be connected before it is paired. But, the dongle is
> always the same. That's the tricky part.
> 
> > Untested.
> 
> Aaron tested it. So, your code is safe ;).
> 
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> 
> The whole set is
> 
> Acked-by: Ping Cheng <pingc@...om.com>
> 

Thanks!

Cheers,
Benjamin

> Thanks for your effort!
> 
> Ping
> 
> > ---
> >
> > No changes in v2
> > ---
> >  drivers/hid/wacom_sys.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
> > index 499cc82..9e283aa 100644
> > --- a/drivers/hid/wacom_sys.c
> > +++ b/drivers/hid/wacom_sys.c
> > @@ -1720,9 +1720,10 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
> >                 error = hid_hw_open(hdev);
> >
> >         if ((wacom_wac->features.type == INTUOSHT ||
> > -           wacom_wac->features.type == INTUOSHT2) &&
> > +            wacom_wac->features.type == INTUOSHT2) &&
> >             (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)) {
> > -                       wacom_wac->shared->touch_input = wacom_wac->touch_input;
> > +               wacom_wac->shared->type = wacom_wac->features.type;
> > +               wacom_wac->shared->touch_input = wacom_wac->touch_input;
> >         }
> >
> >         return 0;
> > --
> > 2.5.5
> >