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Input: estimate number of events per packet

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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>
This commit is contained in:
Jeff Brown 2011-04-18 10:08:02 -07:00 committed by Dmitry Torokhov
parent 9fb0f14e31
commit 80b4895aa4
2 changed files with 46 additions and 0 deletions
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40
drivers/input/input.c
View file

@ -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
include/linux/input/mt.h
View file

@ -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);