Subject: Re: Synaptics touchpad + external mouse with Linux 2.6?
From: Craig Bradney <cbradney@zip.com.au>
To: Krzysztof Halasa <khc@pm.waw.pl>
Cc: Dmitry Torokhov <dtor@mail.ru>, lkml <linux-kernel@vger.kernel.org>
In-Reply-To: <m33c81lsnk.fsf@defiant.pm.waw.pl>
References: <m33c81lsnk.fsf@defiant.pm.waw.pl>
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Date: Mon, 22 Mar 2004 01:50:01 +0100
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On Sun, 2004-03-21 at 23:52, Krzysztof Halasa wrote:
> Hi,
>=20
> I have a notebook PC (an old Fujitsu-Siemens Liteline, celeron 600 etc)
> with a Synaptics touchpad:
>=20
> Synaptics Touchpad, model: 1
>  Firmware: 4.6
>  Sensor: 19
>  new absolute packet format
>  Touchpad has extended capability bits
>  -> multifinger detection
>  -> palm detection
> input: SynPS/2 Synaptics TouchPad on isa0060/serio1
>=20
> This notebook has external mouse+keyboard connector. Is it possible to
> have both the touchpad and the external mouse simultaneously active in
> their native modes? The hardware (keyboard controller) doesn't seem to
> support the active multiplexing mode (by Synaptics and others):
>=20
> drivers/input/serio/i8042.c: d3 -> i8042 (command) [3]
> drivers/input/serio/i8042.c: f0 -> i8042 (parameter) [3]
> drivers/input/serio/i8042.c: 0f <- i8042 (return) [3]
> drivers/input/serio/i8042.c: d3 -> i8042 (command) [3]
> drivers/input/serio/i8042.c: 56 -> i8042 (parameter) [3]
> drivers/input/serio/i8042.c: a9 <- i8042 (return) [3]
> drivers/input/serio/i8042.c: d3 -> i8042 (command) [3]
> drivers/input/serio/i8042.c: a4 -> i8042 (parameter) [3]
> drivers/input/serio/i8042.c: 5b <- i8042 (return) [3]
>=20
> It looks the keyboard controller just forwards all data from both
> devices. I can set them (i.e. Linux and XFree86 driver) to IM PS/2 mode
> and they will both work (Linux treats them as one device), but I can't
> use touchpad's special features.
>=20
> I was thinking about setting them to IM PS/2 mode first (both would go
> IM PS/2) then switching to Synaptics mode (the mouse should ignore it).
> On the receiving side, I could check if the packet is valid for IM or
> Synaptics mode and pass it to the respective driver. Not sure if the
> keyboard controller is fully transparent, though - it could be changing
> data as outlined in the Synaptics PS2-MUX paper ("legacy hidden
> multiplexing").
>=20
> If I set Linux to Synaptics mode (i.e. modprobe psmouse without any
> parameters), I can't use the external mouse as it produces 3-byte
> packets by default (the kernel =3D synaptics.c prints "Synaptics driver
> lost sync at byte 1").
>=20
> What do you think?

Hmm would be a nice thing to have both running "how they
should/natively". I have IMPS/2 set and am running the touchpad with a
usb logitech notebook mouse on a Siemens Amilo D7830.

Craig

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