From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Rafi Rubin <rafi@seas.upenn.edu>
Cc: Henrik Rydberg <rydberg@euromail.se>,
Jiri Kosina <jkosina@suse.cz>,
linux-input@vger.kernel.org, chatty@enac.fr
Subject: Re: [PATCH] hid-ntrig.c Multitouch cleanup and fix
Date: Tue, 9 Mar 2010 15:42:23 -0800 [thread overview]
Message-ID: <20100309234223.GB29942@core.coreip.homeip.net> (raw)
In-Reply-To: <4B96DBEE.4060605@seas.upenn.edu>
On Tue, Mar 09, 2010 at 06:38:22PM -0500, Rafi Rubin wrote:
> On 03/09/2010 06:23 PM, Henrik Rydberg wrote:
> >Rafi Rubin wrote:
> >>>Single touch should be goverened by one of BTN_TOUCH or ABS_PRESSURE.
> >>>BTN_TOOL_DOUBLETAP is a two-finger event.
> >>
> >>That definitely makes sense to me. I really don't know why wacom uses
> >>double tap there.
> >>
> >>Is there any harm in letting through the BTN_0 events? Is the "rdesc"
> >>mapping defined by the hardware or hid?
> >
> >I cannot imagine BTN_0 will do any harm. In synaptics, the BTN_X buttons are
> >mapped to multibuttons without clear-cut usage. The button events that carry
> >well-defined semantic meaning with regard to touch screens are BTN_TOUCH (any
> >finger), BTN_TOOL_FINGER (one finger), BTN_TOOL_PEN (pen), BTN_TOOL_DOUBLETAP
> >(two fingers) and BTN_TOOL_TRIPLETAP (three fingers or more).
> >
> >Henrik
> >
>
> Perhaps we should have a general touch device document.
>
> I looked at the evdev code. And as you say for single touch
> devices, BTN_TOUCH is the bit that matters. It only broken because
> I pulled the TOUCH <- 0 when I removed BTN_0.
>
> So why does evdev associate BTN_TOOL_FINGER with touchpads
> (resulting in the wrong set of assumptions and a poorly calibrated
> touch screen)? I suppose that's really a discussion for another
> list.
>
Historic reasons. When Synaptics driver was in works we needed an event
that is different from BTN_TOUCH to differentiate from touchscreens.
--
Dmitry
next prev parent reply other threads:[~2010-03-09 23:42 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-12 0:19 [PATCH 1/4] HID: hid-ntrig add multi input quirk and clean up Rafi Rubin
2010-02-12 0:19 ` [PATCH 2/4] hid-ntrig.c: removed unnecessary tool switching Rafi Rubin
2010-02-12 0:19 ` [PATCH 3/4] hid-ntrig.c Split multi and single touch Rafi Rubin
2010-02-12 0:19 ` [PATCH 4/4] hid-ntrig: Contact tracking Rafi Rubin
2010-02-12 0:42 ` [PATCH 3/4] hid-ntrig.c Split multi and single touch Dmitry Torokhov
2010-02-12 3:10 ` Rafi Rubin
2010-02-12 8:09 ` Dmitry Torokhov
2010-02-12 19:56 ` Rafi Rubin
2010-02-12 10:41 ` Jiri Kosina
2010-02-12 0:36 ` [PATCH 1/4] HID: hid-ntrig add multi input quirk and clean up Dmitry Torokhov
2010-02-12 0:45 ` Rafi Rubin
2010-02-12 1:03 ` Rafi Rubin
2010-02-12 1:20 ` Dmitry Torokhov
2010-02-12 0:37 ` Rafi Rubin
2010-02-12 3:14 ` Rafi Rubin
2010-02-12 3:14 ` [PATCH 2/4] hid-ntrig.c: removed unnecessary tool switching Rafi Rubin
2010-02-12 3:14 ` [PATCH 3/4] hid-ntrig.c Split multi and single touch Rafi Rubin
2010-02-12 3:14 ` [PATCH 4/4] hid-ntrig: Contact tracking Rafi Rubin
2010-02-20 8:29 ` Mohamed Ikbel Boulabiar
[not found] ` <45cc95261002200025m378e1a80rec09bde5673a6060@mail.gmail.com>
2010-02-20 17:48 ` Rafi Rubin
2010-02-12 8:13 ` [PATCH 3/4] hid-ntrig.c Split multi and single touch Dmitry Torokhov
2010-02-12 23:16 ` Rafi Rubin
2010-02-13 2:13 ` [PATCH] hid-ntrig.c Multitouch cleanup and fix Rafi Rubin
2010-02-13 2:24 ` Rafi Rubin
2010-02-16 12:50 ` Jiri Kosina
2010-03-09 21:01 ` Henrik Rydberg
2010-03-09 21:17 ` Rafi Rubin
2010-03-09 21:19 ` Jiri Kosina
2010-03-09 22:03 ` Stéphane Chatty
2010-03-09 22:25 ` Henrik Rydberg
2010-03-09 22:42 ` Mohamed Ikbel Boulabiar
2010-03-09 23:08 ` Henrik Rydberg
2010-03-09 23:17 ` Dmitry Torokhov
2010-03-09 23:26 ` Henrik Rydberg
2010-03-11 4:30 ` Peter Hutterer
2010-03-11 5:36 ` Mohamed Ikbel Boulabiar
2010-03-11 6:25 ` Peter Hutterer
2010-03-11 9:42 ` Stéphane Chatty
2010-03-09 22:27 ` Dmitry Torokhov
2010-03-09 22:32 ` Rafi Rubin
2010-03-09 22:54 ` Stéphane Chatty
2010-03-09 22:12 ` Rafi Rubin
2010-03-09 22:39 ` Henrik Rydberg
2010-03-09 21:59 ` Henrik Rydberg
2010-03-09 22:11 ` Stéphane Chatty
2010-03-09 22:29 ` Henrik Rydberg
2010-03-09 22:44 ` Stéphane Chatty
2010-03-09 22:27 ` Rafi Rubin
2010-03-09 23:23 ` Henrik Rydberg
2010-03-09 23:38 ` Rafi Rubin
2010-03-09 23:42 ` Dmitry Torokhov [this message]
2010-03-10 0:32 ` Rafi Rubin
2010-03-10 3:47 ` Dmitry Torokhov
2010-03-10 4:40 ` Rafi Rubin
2010-03-10 8:38 ` [PATCH] hid: ntrig touch events rafi
2010-03-10 15:04 ` Jiri Kosina
2010-03-18 20:19 ` Rafi Rubin
2010-03-19 8:44 ` Jiri Kosina
2010-03-19 14:12 ` Rafi Rubin
2010-02-16 12:49 ` [PATCH 2/4] hid-ntrig.c: removed unnecessary tool switching Jiri Kosina
2010-02-12 3:15 ` [PATCH 1/4] HID: hid-ntrig add multi input quirk and clean up Rafi Rubin
2010-02-16 12:49 ` Jiri Kosina
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