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freebsd-dev/sys/dev/evdev/evdev_mt.c
Oleksandr Tymoshenko c736a75712 Implement EVDEV_FLAG_MT_AUTOREL flag (autorelease touchpoints) 
Automaticaly release (send ABS_MT_TRACKING_ID = -1) MT-slots
that has not been listed in current MT protocol type B report.

Slot is counted as listed if corresponding ABS_MT_SLOT event
has been sent regardless of other MT events.

Events are sent on SYN_REPORT event.

Submitted by:	Vladimir Kondratiev <wulf@cicgroup.ru>
2016-10-08 17:59:53 +00:00

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/*-
* Copyright (c) 2016 Vladimir Kondratyev <wulf@cicgroup.ru>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <dev/evdev/input.h>
#include <dev/evdev/evdev.h>
#include <dev/evdev/evdev_private.h>
#ifdef DEBUG
#define debugf(fmt, args...) printf("evdev: " fmt "\n", ##args)
#else
#define debugf(fmt, args...)
#endif
static uint16_t evdev_fngmap[] = {
BTN_TOOL_FINGER,
BTN_TOOL_DOUBLETAP,
BTN_TOOL_TRIPLETAP,
BTN_TOOL_QUADTAP,
BTN_TOOL_QUINTTAP,
};
static uint16_t evdev_mtstmap[][2] = {
{ ABS_MT_POSITION_X, ABS_X },
{ ABS_MT_POSITION_Y, ABS_Y },
{ ABS_MT_PRESSURE, ABS_PRESSURE },
{ ABS_MT_TOUCH_MAJOR, ABS_TOOL_WIDTH },
};
struct evdev_mt_slot {
uint64_t ev_report;
int32_t ev_mt_states[MT_CNT];
};
struct evdev_mt {
int32_t ev_mt_last_reported_slot;
struct evdev_mt_slot ev_mt_slots[];
};
void
evdev_mt_init(struct evdev_dev *evdev)
{
int32_t slot, slots;
slots = MAXIMAL_MT_SLOT(evdev) + 1;
evdev->ev_mt = malloc(offsetof(struct evdev_mt, ev_mt_slots) +
sizeof(struct evdev_mt_slot) * slots, M_EVDEV, M_WAITOK | M_ZERO);
/* Initialize multitouch protocol type B states */
for (slot = 0; slot < slots; slot++) {
/*
* .ev_report should not be initialized to initial value of
* report counter (0) as it brokes free slot detection in
* evdev_get_mt_slot_by_tracking_id. So initialize it to -1
*/
evdev->ev_mt->ev_mt_slots[slot] = (struct evdev_mt_slot) {
.ev_report = 0xFFFFFFFFFFFFFFFFULL,
.ev_mt_states[ABS_MT_INDEX(ABS_MT_TRACKING_ID)] = -1,
};
}
if (bit_test(evdev->ev_flags, EVDEV_FLAG_MT_STCOMPAT))
evdev_support_mt_compat(evdev);
}
void
evdev_mt_free(struct evdev_dev *evdev)
{
free(evdev->ev_mt, M_EVDEV);
}
int32_t
evdev_get_last_mt_slot(struct evdev_dev *evdev)
{
return (evdev->ev_mt->ev_mt_last_reported_slot);
}
void
evdev_set_last_mt_slot(struct evdev_dev *evdev, int32_t slot)
{
evdev->ev_mt->ev_mt_slots[slot].ev_report = evdev->ev_report_count;
evdev->ev_mt->ev_mt_last_reported_slot = slot;
}
inline int32_t
evdev_get_mt_value(struct evdev_dev *evdev, int32_t slot, int16_t code)
{
return (evdev->ev_mt->
ev_mt_slots[slot].ev_mt_states[ABS_MT_INDEX(code)]);
}
inline void
evdev_set_mt_value(struct evdev_dev *evdev, int32_t slot, int16_t code,
int32_t value)
{
evdev->ev_mt->ev_mt_slots[slot].ev_mt_states[ABS_MT_INDEX(code)] =
value;
}
int32_t
evdev_get_mt_slot_by_tracking_id(struct evdev_dev *evdev, int32_t tracking_id)
{
int32_t tr_id, slot, free_slot = -1;
for (slot = 0; slot <= MAXIMAL_MT_SLOT(evdev); slot++) {
tr_id = evdev_get_mt_value(evdev, slot, ABS_MT_TRACKING_ID);
if (tr_id == tracking_id)
return (slot);
/*
* Its possible that slot will be reassigned in a place of just
* released one within the same report. To avoid this compare
* report counter with slot`s report number updated with each
* ABS_MT_TRACKING_ID change.
*/
if (free_slot == -1 && tr_id == -1 &&
evdev->ev_mt->ev_mt_slots[slot].ev_report !=
evdev->ev_report_count)
free_slot = slot;
}
return (free_slot);
}
void
evdev_support_nfingers(struct evdev_dev *evdev, int32_t nfingers)
{
int32_t i;
for (i = 0; i < MIN(nitems(evdev_fngmap), nfingers); i++)
evdev_support_key(evdev, evdev_fngmap[i]);
}
void
evdev_support_mt_compat(struct evdev_dev *evdev)
{
int32_t i;
if (evdev->ev_absinfo == NULL)
return;
evdev_support_event(evdev, EV_KEY);
evdev_support_key(evdev, BTN_TOUCH);
/* Touchscreens should not advertise tap tool capabilities */
if (!bit_test(evdev->ev_prop_flags, INPUT_PROP_DIRECT))
evdev_support_nfingers(evdev, MAXIMAL_MT_SLOT(evdev) + 1);
/* Echo 0-th MT-slot as ST-slot */
for (i = 0; i < nitems(evdev_mtstmap); i++)
if (bit_test(evdev->ev_abs_flags, evdev_mtstmap[i][0]))
evdev_support_abs(evdev, evdev_mtstmap[i][1],
evdev->ev_absinfo[evdev_mtstmap[i][0]].value,
evdev->ev_absinfo[evdev_mtstmap[i][0]].minimum,
evdev->ev_absinfo[evdev_mtstmap[i][0]].maximum,
evdev->ev_absinfo[evdev_mtstmap[i][0]].fuzz,
evdev->ev_absinfo[evdev_mtstmap[i][0]].flat,
evdev->ev_absinfo[evdev_mtstmap[i][0]].resolution);
}
static int32_t
evdev_count_fingers(struct evdev_dev *evdev)
{
int32_t nfingers = 0, i;
for (i = 0; i <= MAXIMAL_MT_SLOT(evdev); i++)
if (evdev_get_mt_value(evdev, i, ABS_MT_TRACKING_ID) != -1)
nfingers++;
return (nfingers);
}
static void
evdev_send_nfingers(struct evdev_dev *evdev, int32_t nfingers)
{
int32_t i;
EVDEV_LOCK_ASSERT(evdev);
if (nfingers > nitems(evdev_fngmap))
nfingers = nitems(evdev_fngmap);
for (i = 0; i < nitems(evdev_fngmap); i++)
evdev_send_event(evdev, EV_KEY, evdev_fngmap[i],
nfingers == i + 1);
}
void
evdev_push_nfingers(struct evdev_dev *evdev, int32_t nfingers)
{
if (evdev->ev_lock_type == EV_LOCK_INTERNAL)
EVDEV_LOCK(evdev);
else
EVDEV_LOCK_ASSERT(evdev);
evdev_send_nfingers(evdev, nfingers);
if (evdev->ev_lock_type == EV_LOCK_INTERNAL)
EVDEV_UNLOCK(evdev);
}
void
evdev_send_mt_compat(struct evdev_dev *evdev)
{
int32_t nfingers, i;
EVDEV_LOCK_ASSERT(evdev);
nfingers = evdev_count_fingers(evdev);
evdev_send_event(evdev, EV_KEY, BTN_TOUCH, nfingers > 0);
if (evdev_get_mt_value(evdev, 0, ABS_MT_TRACKING_ID) != -1)
/* Echo 0-th MT-slot as ST-slot */
for (i = 0; i < nitems(evdev_mtstmap); i++)
if (bit_test(evdev->ev_abs_flags, evdev_mtstmap[i][1]))
evdev_send_event(evdev, EV_ABS,
evdev_mtstmap[i][1],
evdev_get_mt_value(evdev, 0,
evdev_mtstmap[i][0]));
/* Touchscreens should not report tool taps */
if (!bit_test(evdev->ev_prop_flags, INPUT_PROP_DIRECT))
evdev_send_nfingers(evdev, nfingers);
if (nfingers == 0)
evdev_send_event(evdev, EV_ABS, ABS_PRESSURE, 0);
}
void
evdev_push_mt_compat(struct evdev_dev *evdev)
{
if (evdev->ev_lock_type == EV_LOCK_INTERNAL)
EVDEV_LOCK(evdev);
else
EVDEV_LOCK_ASSERT(evdev);
evdev_send_mt_compat(evdev);
if (evdev->ev_lock_type == EV_LOCK_INTERNAL)
EVDEV_UNLOCK(evdev);
}
void
evdev_send_mt_autorel(struct evdev_dev *evdev)
{
int32_t slot;
EVDEV_LOCK_ASSERT(evdev);
for (slot = 0; slot <= MAXIMAL_MT_SLOT(evdev); slot++) {
if (evdev->ev_mt->ev_mt_slots[slot].ev_report !=
evdev->ev_report_count &&
evdev_get_mt_value(evdev, slot, ABS_MT_TRACKING_ID) != -1){
evdev_send_event(evdev, EV_ABS, ABS_MT_SLOT, slot);
evdev_send_event(evdev, EV_ABS, ABS_MT_TRACKING_ID,
-1);
}
}
}
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