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Input: MT - handle semi-mt devices in core

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Most semi-mt drivers use the slots in a manual way, but really only
need to treat the finger count manually. With this patch, a semi-mt
driver may use the input-mt core for everything else.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Henrik Rydberg 2013-04-07 20:52:22 -07:00 • committed by Dmitry Torokhov
commit a0ef6a348a
2 changed files with 8 additions and 1 deletions
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8
drivers/input/input-mt.c
View file

@ -79,6 +79,8 @@ int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
}
if (flags & INPUT_MT_DIRECT)
__set_bit(INPUT_PROP_DIRECT, dev->propbit);
if (flags & INPUT_MT_SEMI_MT)
__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
if (flags & INPUT_MT_TRACK) {
unsigned int n2 = num_slots * num_slots;
mt->red = kcalloc(n2, sizeof(*mt->red), GFP_KERNEL);
@ -246,6 +248,7 @@ void input_mt_sync_frame(struct input_dev *dev)
{
struct input_mt *mt = dev->mt;
struct input_mt_slot *s;
bool use_count = false;
if (!mt)
return;
@ -259,7 +262,10 @@ void input_mt_sync_frame(struct input_dev *dev)
}
}
input_mt_report_pointer_emulation(dev, (mt->flags & INPUT_MT_POINTER));
if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))
use_count = true;
input_mt_report_pointer_emulation(dev, use_count);
mt->frame++;
}

1
include/linux/input/mt.h
View file

@ -19,6 +19,7 @@
#define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */
#define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */
#define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */
#define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */
/**
* struct input_mt_slot - represents the state of an input MT slot