linux-kernel - Re: Proposal for synaptics driver

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Message-ID: <4CB4A1BB.9010006@bitmath.org>
Date:	Tue, 12 Oct 2010 19:58:19 +0200
From:	Henrik Rydberg <rydberg@...math.org>
To:	Chase Douglas <chase.douglas@...onical.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Chris Bagwell <chris@...bagwell.com>,
	Takashi Iwai <tiwai@...e.de>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input <linux-input@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Proposal for synaptics driver

On 10/12/2010 06:23 PM, Chase Douglas wrote:
[...]

> The rest of the
> touchpad is stationary and does not click. If no one has a better name
> for these touchpads, I'll refer to them as "integrated buttons"
> touchpads.


The name "integrated button" is the term in use for the later Macbook models,
where there is a button that clicks anywhere on the pad.

[...]

> My definition of a usable mouse is single touch and left

> click support (including click and drag using a physical button).


This has been stated several times already in related threads.

[...]
> For ClickPad devices, my feeling is that we should translate middle

> button clicks to left button clicks in the kernel, and MT+ST emulation
> should be performed. Middle and right click functionality may be
> provided for in userspace,


Having the physical click map to BTN_LEFT, regardless of where on the pad, and
flagging the presence of an integrated button via the version field in the
device id, would be consistent with existing drivers.

[...]

> I think we should disable single touch support over the buttons due to
> the following scenario:
> 
> User positions cursor over button on screen, attempts to click physical
> touchpad button, cursor moves because of motion on touchpad when user
> depresses button.


The location and number of buttons could be freely mappable in userspace, so I
think we want to put minimum energy into the emulation part, considering it is
reworked in userspace anyways.


[...]

> Now the bit about integrated button touchpad detection. First, I would
> be interested in learning if anyone can disprove bit 0x200000 of the 0c
> extended caps flags means integrated buttons.


I think the easiest way to learn this is to produce a dkms package for people to
test.

Henrik
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