Hi,

When Zephaniah Hull sent in a patch for the OLPC touchpad [0], it was
suggested that the psmouse driver be split out into separate components.
 What's currently there is way too fat, and people are not happy about
adding even more code to the driver.

I've taken a stab at doing just that.  The attached patch splits the
various protocol extensions into their own modules, defines a protocol
registration layer, and allows modules to define their own psmouse
protocols.  Psmouse-base now only registers a few extensions, and then
scans the ps/2 ports.  Other modules (ie, psmouse-alps) register their
extension, and force a rescan of all serio ports that the psmouse driver
happens to be using.  The max_proto stuff has been removed, with the
intention that people should be loading (or unloading) only the modules
they need, rather than playing around w/ module arguments.  Rather than
playing games w/ extension detection ordering, I opted to just reset the
port before every scan.

The patch is attached, and I have a git repository here:

git://dev.laptop.org/users/dilinger/psmouse-split

There's also a gitweb interface:

http://dev.laptop.org/git?p=users/dilinger/psmouse-split;a=summary

Comments and feedback are welcome.  I intend to do a few further
cleanups (at the very least, there are now stale header files that need
to go away, and further testing is needed).

[0] http://thread.gmane.org/gmane.linux.kernel/441574/