Re: [PATCH 6/9 v2] Input: synaptics - process finger (<=3) transitions

[Chase Douglas]

On 07/20/2011 06:39 AM, djkurtz@xxxxxxxxxxxx wrote:
> From: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
> 
> Synaptics image sensor touchpads track 5 fingers, but only report 2.
> 
> This patch attempts to deal with some idiosyncrasies of these touchpads:
> 
>  * When there are 3 or more fingers, only two are reported.
>  * The number of fingers can change at any time, but is only reported in
>    SGM packets, thus at a number-of-fingers change, it is not possible
>    to tell whether the AGM finger is for the original or new number of
>    fingers.
>  * When the number of fingers changes from 2->3 it is not
>    possible to tell which of the 2 fingers are now reported.
>  * When number of fingers changes from 3->2 it is often not possible to
>    tell which finger was removed, and which are now being reported.
> 
> When 2 or more packets are present on the touchpad, the kernel reports
                 ^touches or fingers
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/