From mboxrd@z Thu Jan  1 00:00:00 1970
From: Henrik Rydberg <rydberg@euromail.se>
Subject: Re: [PATCH] hid-ntrig.c Multitouch cleanup and fix
Date: Wed, 10 Mar 2010 00:23:06 +0100
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References: <4B75E14A.2050602@seas.upenn.edu> <1266027185-5311-1-git-send-email-rafi@seas.upenn.edu> <4B760D60.6020907@seas.upenn.edu> <alpine.LNX.2.00.1002161349470.30967@pobox.suse.cz> <4B96B740.7020208@euromail.se> <4B96BAF1.5070209@seas.upenn.edu> <4B96C4A8.3060005@euromail.se> <4B96CB41.9040804@seas.upenn.edu>
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To: Rafi Rubin <rafi@seas.upenn.edu>
Cc: Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, chatty@enac.fr

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