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Commit 80b4895a authored by Jeff Brown's avatar Jeff Brown Committed by Dmitry Torokhov
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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: default avatarJeff Brown <jeffbrown@android.com>
Reviewed-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 9fb0f14e
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+40 −0
Original line number Diff line number Diff line
@@ -1746,6 +1746,42 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
}
EXPORT_SYMBOL(input_set_capability);

static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
{
	int mt_slots;
	int i;
	unsigned int events;

	if (dev->mtsize) {
		mt_slots = dev->mtsize;
	} else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
		mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
			   dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
		clamp(mt_slots, 2, 32);
	} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
		mt_slots = 2;
	} else {
		mt_slots = 0;
	}

	events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */

	for (i = 0; i < ABS_CNT; i++) {
		if (test_bit(i, dev->absbit)) {
			if (input_is_mt_axis(i))
				events += mt_slots;
			else
				events++;
		}
	}

	for (i = 0; i < REL_CNT; i++)
		if (test_bit(i, dev->relbit))
			events++;

	return events;
}

#define INPUT_CLEANSE_BITMASK(dev, type, bits)				\
	do {								\
		if (!test_bit(EV_##type, dev->evbit))			\
@@ -1793,6 +1829,10 @@ int input_register_device(struct input_dev *dev)
	/* Make sure that bitmasks not mentioned in dev->evbit are clean. */
	input_cleanse_bitmasks(dev);

	if (!dev->hint_events_per_packet)
		dev->hint_events_per_packet =
				input_estimate_events_per_packet(dev);

	/*
	 * If delay and period are pre-set by the driver, then autorepeating
	 * is handled by the driver itself and we don't do it in input.c.
+6 −0
Original line number Diff line number Diff line
@@ -48,6 +48,12 @@ static inline void input_mt_slot(struct input_dev *dev, int slot)
	input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
}

static inline bool input_is_mt_axis(int axis)
{
	return axis == ABS_MT_SLOT ||
		(axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST);
}

void input_mt_report_slot_state(struct input_dev *dev,
				unsigned int tool_type, bool active);