linux-kernel - Re: [PATCH] HID: magicmouse: Implement Multi-touch Protocol B (MT-B)

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Message-ID: <20120702100741.GA1496@polaris.bitmath.org>
Date:	Mon, 2 Jul 2012 12:07:41 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Yufeng Shen <miletus@...omium.org>
Cc:	linux-input@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org>,
	Andrew de los Reyes <adlr@...omium.org>
Subject: Re: [PATCH] HID: magicmouse: Implement Multi-touch Protocol B (MT-B)

On Thu, Jun 28, 2012 at 03:54:31PM -0400, Yufeng Shen wrote:
> The driver for Apple Magic Trackpad/Mouse currently uses
> Multi-touch Protocol A (MT-A) to report touch events and uses
> ABS_MT_TRACKING_ID to do finger tracking. The fact of the device
> being able to track individual finger makes it possible to
> report touch events using MT-B. This patch adds the support
> for the driver to report MT-B and makes it configurable through
> module parameter so that existing codes that are relying on its
> MT-A implemtation don't get affected.

Are there any such codes? Most systems, if not all, seem to use mtdev,
which can handle both protocols. I do not think a parameter switch is
a good idea. Switching to MT-B or leaving things as is look like the
viable options.

Thanks,
Henrik
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