Input: estimate number of events per packet
Calculate a default based on the number of ABS axes, REL axes, and MT slots for the device during input device registration. Signed-off-by: Jeff Brown <jeffbrown@android.com> Reviewed-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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@ -1746,6 +1746,42 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
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}
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EXPORT_SYMBOL(input_set_capability);
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static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
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{
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int mt_slots;
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int i;
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unsigned int events;
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if (dev->mtsize) {
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mt_slots = dev->mtsize;
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} else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
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mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
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dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
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clamp(mt_slots, 2, 32);
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} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
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mt_slots = 2;
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} else {
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mt_slots = 0;
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}
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events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
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for (i = 0; i < ABS_CNT; i++) {
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if (test_bit(i, dev->absbit)) {
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if (input_is_mt_axis(i))
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events += mt_slots;
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else
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events++;
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}
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}
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for (i = 0; i < REL_CNT; i++)
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if (test_bit(i, dev->relbit))
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events++;
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return events;
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}
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#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
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do { \
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if (!test_bit(EV_##type, dev->evbit)) \
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@ -1793,6 +1829,10 @@ int input_register_device(struct input_dev *dev)
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/* Make sure that bitmasks not mentioned in dev->evbit are clean. */
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input_cleanse_bitmasks(dev);
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if (!dev->hint_events_per_packet)
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dev->hint_events_per_packet =
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input_estimate_events_per_packet(dev);
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/*
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* If delay and period are pre-set by the driver, then autorepeating
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* is handled by the driver itself and we don't do it in input.c.
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@ -48,6 +48,12 @@ static inline void input_mt_slot(struct input_dev *dev, int slot)
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input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
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}
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static inline bool input_is_mt_axis(int axis)
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{
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return axis == ABS_MT_SLOT ||
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(axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST);
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}
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void input_mt_report_slot_state(struct input_dev *dev,
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unsigned int tool_type, bool active);
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