Event filtering and finger tracking is left to user space.
The order in which the packets appear in the event stream is not The ABS_MT_TRACKING_ID, either provided by the hardware or computed fromįor type A devices, the kernel driver should generate an arbitraryĮnumeration of the full set of anonymous contacts currently on the Type B slot protocol lies in the usage of identifiable contacts to reduce The main difference between the stateless type A protocol and the stateful This instructs the receiver to act upon eventsĪccumulated since last EV_SYN/SYN_REPORT and prepare to receive a new set
#MULTITOUCH MULTIUSER DRIVERS#
This generates an ABS_MT_SLOT event, which instructs the receiver toĪll drivers mark the end of a multi-touch transfer by calling the usual
Input_mt_slot(), with a slot as argument, at the beginning of each packet. This generates a SYN_MT_REPORTĮvent, which instructs the receiver to accept the data for the currentĭrivers for type B devices separate contact packets by calling Input_mt_sync() at the end of each packet. Since these events are ignored by current single-touch (ST)Īpplications, the MT protocol can be implemented on top of the ST protocolĭrivers for type A devices separate contact packets by calling Only the ABS_MT events are recognized as part of a contact Contact details are sent sequentially as separate packets of ABS_MTĮvents.
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