Hide ABS (especially multitouch) events

[agoode]

The keyboard exposes a huge number of irrelevant events. Here are a few:

    Event code 47 (ABS_MT_SLOT)
    Event code 48 (ABS_MT_TOUCH_MAJOR)
    Event code 49 (ABS_MT_TOUCH_MINOR)
    Event code 50 (ABS_MT_WIDTH_MAJOR)
    Event code 51 (ABS_MT_WIDTH_MINOR)
    Event code 52 (ABS_MT_ORIENTATION)
    Event code 53 (ABS_MT_POSITION_X)
    Event code 54 (ABS_MT_POSITION_Y)
    Event code 55 (ABS_MT_TOOL_TYPE)
    Event code 56 (ABS_MT_BLOB_ID)
    Event code 57 (ABS_MT_TRACKING_ID)
    Event code 58 (ABS_MT_PRESSURE)
    Event code 59 (ABS_MT_DISTANCE)
    Event code 60 (ABS_MT_TOOL_X)
    Event code 61 (ABS_MT_TOOL_Y)
    Event code 62 (?)
    Event code 63 (?)

The problem is that Chrome OS gets confused by the multitouch events and needs some special workarounds: https://code.google.com/p/chromium/issues/detail?id=430319

To cleanly fix this, it would be better to just not expose the EV_ABS events to userspace. I don't think they can ever be generated by the device anyway.