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Commit 80b4895a authored by Jeff Brown's avatar Jeff Brown Committed by Dmitry Torokhov
Browse files

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

drivers/input/input.c

+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.

include/linux/input/mt.h

+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);