SYNAPTICS_PACKETQUEUE
(x + SYNAPTICS_PACKETQUEUE) % SYNAPTICS_PACKETQUEUE
synapticspacket_t queue[SYNAPTICS_PACKETQUEUE];
smoother->queue_cursor = SYNAPTICS_PACKETQUEUE;
if (smoother->queue_len < SYNAPTICS_PACKETQUEUE)
if (arg < 1 || arg > SYNAPTICS_PACKETQUEUE)