> To be more precise, the correct approach is: > > for (i = 0; i < CY_MAX_ID; i++) > if (!(used & (1 << i))) > cyttsp_report_slot_empty(ts->input, i); > > or > > for (i = 0; i < CY_MAX_ID; i++) > if (previous & (1 << i) && > !(used & (1 << i))) > cyttsp_report_slot_empty(ts->input, i); > > where used is a bitmask to store each contact state for this event and > previous is a bitmask to store the state for the previous event. > > I looked at input_mt_report_slot_state() and it seems that it only > checks whether the active parameter to send an ABS_MT_TRACKING_ID -1 > input event, so I think that I should use the latter. Please implement the first version; the event never gets sent unless there is an actual change, which you can see by following the code deeper. If/when there are more drivers in need of a similar approach, I might integrate the logic in the input-mt core instead. Thanks, Henrik -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
