Does not work in gpi0 mode, can work in polling mode.
He sees it as a mouse, it happened to me on my latitude before the kext alpshid came out, then it was fixed.
In your case it is a syna.
Write on the gitter of I2c and look for if it is compatible with voodoo rmi I2c.
Good luck.
But try instead of I2c hid put I2c syna