Message-ID: <4CD71131.3080706@euromail.se>
Date: Sun, 07 Nov 2010 21:50:57 +0100
From: Henrik Rydberg <rydberg@euromail.se>
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To: Rafi Rubin <rafi@seas.upenn.edu>
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org, Chris Bagwell <chris@cnpbagwell.com>,
        Chase Douglas <chasedouglas@gmail.com>, Takashi Iwai <tiwai@suse.de>
Subject: Re: [PATCH] input: Introduce light-weight contact tracking
References: <1289161108-32309-1-git-send-email-rydberg@euromail.se> <4CD70FC0.6060503@seas.upenn.edu>
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On 11/07/2010 09:44 PM, Rafi Rubin wrote:

> On 11/07/2010 03:18 PM, Henrik Rydberg wrote:
>> Some kernel drivers demand the use of contact tracking for proper
>> filtering and pointer emulation. With one exception, these drivers
>> are limited to a maximum of four concurrent contacts. This patch adds
>> a simple matcher for up to four contacts, with these notable properties:
> 
> Tracking in the ntrig driver needs to support a minimum of 6 fingers.  I have
> also seen press releases claiming 10+ eventually.  I don't know if those devices
> will support tracking in the hardware/firmware.


This is the exception I was talking about. The thing is, I can very well see a
driver supporting four fingers even if the device claims to support six. After
all, getting those four fingers working well will still be a big improvement.

Henrik
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