Re: [PATCH 6/6] Input: ALPS - mix trackstick and external PS/2 mouse data

["Pali Rohár" <pali.rohar@gmail.com>]

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On Wednesday 14 January 2015 23:55:54 Dmitry Torokhov wrote:
> From: Pali Rohár <pali.rohar@gmail.com>
> 
> Previously dev2 device was used for both external PS/2 mouse
> and internal trackstick device (if available). This change
> introduces dev3 device which is used for external PS/2 mouse
> data and dev2 is now used only for trackstick.
> 
> In case that trackstick is not present dev2 is not created, so
> userspace does not see non existent device in system.
> 
> Because laptops with ALPS devices often do not use i8042
> active multiplexing all data (from touchpad, trackstick and
> external PS/2 mouse) come to one port.  So it is not possible
> to know if external PS/2 mouse is connected or not. In most
> cases external PS/2 mouse is not connected so driver will
> create dev3 input device after first bare PS/2 packet will be
> received. So there will not be "ghost" input device.
> 
> This change also helps in identifying possible problems in
> future if driver decides to report 6-bytes trackstick packets
> as 3-bytes bare PS/2 (data will be reported to dev3 instead
> dev2).
> 
> Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Subject should be: "do *not* mix" or "prevent mix"

-- 
Pali Rohár
pali.rohar@gmail.com

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