On Wednesday 14 January 2015 23:55:54 Dmitry Torokhov wrote: > From: Pali Rohár <pali.rohar@xxxxxxxxx> > > 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@xxxxxxxxx> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Subject should be: "do *not* mix" or "prevent mix" -- Pali Rohár pali.rohar@xxxxxxxxx
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