Synapses simply indicate a change in a Count value
For example, in the dual-axes positioning table scenario, a user
application would likely want to know the exact X and Y position at the
time of a given event -- that means an event should provide two Count
values (and possibly associated device flags) when it occurs. I'm not
sure yet how the struct counter_event should be defined in order to
support this; we will need to indicate the format of data as well as
provide the data itself. Perhaps, we can handle this by providing an
unique id field so that only a single datum (e.g. a single count value)
is provided via the value field, but subsequent struct counter_event
items share the same id so that the user knows that a particular datum
is part of a larger group of data for a specific event.