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Date: Mon, 20 Dec 2010 10:20:13 -0600 From: Chris Bagwell <chris@...bagwell.com> To: Henrik Rydberg <rydberg@...omail.se> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, Jiri Kosina <jkosina@...e.cz>, Takashi Iwai <tiwai@...e.de>, Chase Douglas <chase.douglas@...onical.com>, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/3] Input: synaptics - add multi-finger and semi-mt support On Mon, Dec 20, 2010 at 7:39 AM, Henrik Rydberg <rydberg@...omail.se> wrote: > The Synaptics 2.7 series of touchpads support a mode for reporting two > sets of X/Y/Pressure data (advanced gesture mode). By default, these > devices report only single finger data, depriving userspace of the > nowadays ubiquitous two-finger scroll gesture. > > Enabling advanced gesture mode also enables the multi-finger report, > although the device does not claim that capability. Up to three > fingers can be reported this way. > > While two or three fingers are touching, the normal packet is > prepended by a reduced finger packet of lower resolution. From the two > packets (which do not represent the actual fingers), the bounding > rectangle of the individual contacts can be extracted. This > information is sufficient to perform scaling gestures and a limited > form of rotation gesture. The behavior has been coined semi-mt > capability, and is signaled to userspace via the INPUT_PROP_SEMI_MT > device property. > > Work to decode the advanced gesture packet: Takashi Iwai. > Cleanup and testing of the original patch: Chase Douglas. > Minor cleanup and testing: Chris Bagwell. > Finalization and semi-mt support: Henrik Rydberg. > > Reported-by: Tobyn Bertram > Not-yet-signed-off-by: Takashi Iwai <tiwai@...e.de> > Not-yet-signed-off-by: Chase Douglas <chase.douglas@...onical.com> > Not-yet-signed-off-by: Chris Bagwell <chris@...bagwell.com> > Signed-off-by: Henrik Rydberg <rydberg@...omail.se> > --- That turned out better. You can keep my sign off on there. Chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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