There isn't much discussion on spic(4) in the groups and the man page
reflects that it has only been tested on a Vaio SRX77.  For the sake of
the list archives, it also works very well in my Vaio PCG-R505GL.

Dmesg:
spic0 at acpi0 (SNY6001): Sony Programmable I/O Controller
spic0: io 0x1080-0x109f irq 11
wsmouse0 at spic0 mux 0

xfree86 config:

Section "ServerLayout"
        Identifier     "XFree86 Configured"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Mouse1" "AlwaysCore"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

[...snip...]

Section "InputDevice"
        # Tochpad
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "wsmouse"
        Option      "Device" "/dev/wsmouse1"
        Option      "Emulate3Buttons" "yes"
EndSection

Section "InputDevice"
        # jog dial
        Identifier  "Mouse1"
        Driver      "mouse"
        Option      "Protocol" "wsmouse"
        Option      "Device" "/dev/wsmouse0"
        Option      "Emulate3Buttons" "no"
        Option      "ZAxisMapping" "4 5"
EndSection

-lava