[Bug 117451] No input driver for "SYNAPTICS Synaptics Touch Digitizer"

https://bugzilla.kernel.org/show_bug.cgi?id=117451

Summary:

There are many hybrid 2-in-1 tablet/notebook PCs being shipped by 
companies such as Dell, Acer and Asus which have a detachable docking 
keyboard.

The display has a touchscreen digitiser which identifies as

SYNAPTICS Synaptics Touch Digitizer V{03|04}

there is often an additional:

SYNAPTICS Synaptics Touch Digitizer V{03|04} Pen

There is no support for this in the existing synaptics_usb driver. The 
usbhid driver binds to the device but only provides mouse-like support - 
there is no multitouch, gesture, or scroll support, although the 
hid_multitouch driver attaches.