linux-kernel - Re: [PATCH v1 09/10] Input: atmel_mxt_ts - tool type is ignored when slot is closed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180725052641.GA7072@jelly>
Date:   Wed, 25 Jul 2018 15:26:41 +1000
From:   Peter Hutterer <peter.hutterer@...-t.net>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Nick Dyer <nick@...anahar.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        cphealy@...il.com, nikita.yoush@...entembedded.com,
        l.stach@...gutronix.de, nick.dyer@...ev.co.uk
Subject: Re: [PATCH v1 09/10] Input: atmel_mxt_ts - tool type is ignored when
 slot is closed

On Tue, Jul 24, 2018 at 10:23:27AM +0200, Benjamin Tissoires wrote:
> On Tue, Jul 24, 2018 at 12:34 AM Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> >
> > On Fri, Jul 20, 2018 at 10:51:21PM +0100, Nick Dyer wrote:
> > > From: Nick Dyer <nick.dyer@...ev.co.uk>
> > >
> > > input_mt_report_slot_state() ignores the tool when the slot is closed.
> > > Remove the tool type from these function calls, which has caused a bit of
> > > confusion.
> >
> > Hmm, maybe we could introduce MT_TOOL_NONE or MT_TOOL_INACTIVE and get
> > rid of the 3rd parameter? It will require a bit of macro trickery for a
> > release or 2...
> 
> I am not sure what would be the benefit of adding those new tools, if
> the input_mt code discards them. Do you want to forward them to the
> userspace with the release?
> This reminds me the discussion we had recently with the touchscreens
> releasing the slots with a MT_TOOL_PALM.
> 
> Anyway, better include Peter as he will be using this new MT_TOOL.

thanks for the CC, would've missed this.

>From what I read this would be a helper for internal changes only, not
exposed to userspace? If so maybe it's better/easier/more readable to break
it into two functions
  input_mt_open_slot(dev, MT_TOOL_FINGER)
  input_mt_close_slot(dev)
  
This removes any ambiguity about the handling of the tool and should be a
fairly trivial search/replace. Replace the 'open/close' terminology with
whatever suits better.

Cheers,
   Peter

> > > Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
> > > ---
> > >  drivers/input/touchscreen/atmel_mxt_ts.c | 5 ++---
> > >  1 file changed, 2 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> > > index d7023d261458..c31af790ef84 100644
> > > --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> > > +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> > > @@ -838,8 +838,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
> > >                * have happened.
> > >                */
> > >               if (status & MXT_T9_RELEASE) {
> > > -                     input_mt_report_slot_state(input_dev,
> > > -                                                MT_TOOL_FINGER, 0);
> > > +                     input_mt_report_slot_state(input_dev, 0, 0);
> > >                       mxt_input_sync(data);
> > >               }
> > >
> > > @@ -855,7 +854,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
> > >               input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
> > >       } else {
> > >               /* Touch no longer active, close out slot */
> > > -             input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
> > > +             input_mt_report_slot_state(input_dev, 0, 0);
> > >       }
> > >
> > >       data->update_input = true;
> > > --
> > > 2.17.1
> > >
> >
> > --
> > Dmitry
> --
> To unsubscribe from this list: send the line "unsubscribe linux-input" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>