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input: Set default events per packet for MT devices.

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Use the number of ABS_MT_SLOTs or ABS_MT_TRACKING_IDs to choose a
default number of events per packet.

Signed-off-by: jeffbrown@android.com
This commit is contained in:
Jeff Brown 2011-03-16 23:17:05 -07:00 committed by Rebecca Schultz Zavin
parent 1799b42ff4
commit e576135196
1 changed files with 24 additions and 0 deletions
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24
drivers/input/input.c
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@ -1700,6 +1700,27 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
}
EXPORT_SYMBOL(input_set_capability);
static void input_set_default_events_per_packet(struct input_dev *dev)
{
int slots;
if (dev->hint_events_per_packet)
return;
if (dev->mtsize)
slots = dev->mtsize;
else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit))
slots = min(20, dev->absinfo[ABS_MT_TRACKING_ID].maximum -
dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1);
else if (test_bit(ABS_MT_POSITION_X, dev->absbit))
slots = 2;
else
slots = 0;
if (slots)
input_set_events_per_packet(dev, slots * 10);
}
#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
do { \
if (!test_bit(EV_##type, dev->evbit)) \
@ -1738,6 +1759,9 @@ int input_register_device(struct input_dev *dev)
const char *path;
int error;
/* Use a larger default input buffer for MT devices */
input_set_default_events_per_packet(dev);
/* Every input device generates EV_SYN/SYN_REPORT events. */
__set_bit(EV_SYN, dev->evbit);