Re: [PATCH 3/3] input: mt: Move tracking and pointer emulation toinput-mt (rev2)

[Chase Douglas]

On 12/01/2010 09:21 AM, Henrik Rydberg wrote:
> The drivers using the type B protocol all report tracking information
> the same way. The contact id is semantically equivalent to
> ABS_MT_SLOT, and the handling of ABS_MT_TRACKING_ID only complicates
> the driver. The situation can be improved upon by providing a common
> pointer emulation code, thereby removing the need for the tracking id
> in the driver.  This patch moves all tracking event handling over to
> the input core, simplifying both the existing drivers and the ones
> currently in preparation.

When two or more fingers are down, one of the fingers controls
ABS_{X,Y}. I think the aim is to emulate current behavior for
synaptics-style touchpads, which average the position in firmware. Thus,
we should be averaging the touch positions to generate the ABS_{X,Y} values.

-- Chase
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