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touchpad: add support for multi-finger tapping

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2014-02-07 15:18:17 +10:00
parent 3df87f4fe3
commit d4bd05184a
5 changed files with 1395 additions and 0 deletions
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1
src/Makefile.am
View file

@ -13,6 +13,7 @@ libinput_la_SOURCES = \
evdev.h \
evdev-mt-touchpad.c \
evdev-mt-touchpad.h \
evdev-mt-touchpad-tap.c \
evdev-touchpad.c \
filter.c \
filter.h \

586
src/evdev-mt-touchpad-tap.c Normal file
View file

@ -0,0 +1,586 @@
/*
* Copyright © 2013 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Red Hat
* not be used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission. Red
* Hat makes no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <sys/timerfd.h>
#include "evdev-mt-touchpad.h"
#define CASE_RETURN_STRING(a) case a: return #a;
#define DEFAULT_TAP_TIMEOUT_PERIOD 180
#define DEFAULT_TAP_MOVE_THRESHOLD 30
enum tap_event {
TAP_EVENT_TOUCH = 12,
TAP_EVENT_MOTION,
TAP_EVENT_RELEASE,
TAP_EVENT_BUTTON,
TAP_EVENT_TIMEOUT,
};
/*****************************************
* DO NOT EDIT THIS FILE!
*
* Look at the state diagram in doc/touchpad-tap-state-machine.svg, or
* online at
* https://drive.google.com/file/d/0B1NwWmji69noYTdMcU1kTUZuUVE/edit?usp=sharing
* (it's a http://draw.io diagram)
*
* Any changes in this file must be represented in the diagram.
*/
static inline const char*
tap_state_to_str(enum tp_tap_state state) {
switch(state) {
CASE_RETURN_STRING(TAP_STATE_IDLE);
CASE_RETURN_STRING(TAP_STATE_HOLD);
CASE_RETURN_STRING(TAP_STATE_TOUCH);
CASE_RETURN_STRING(TAP_STATE_TAPPED);
CASE_RETURN_STRING(TAP_STATE_TOUCH_2);
CASE_RETURN_STRING(TAP_STATE_TOUCH_2_HOLD);
CASE_RETURN_STRING(TAP_STATE_TOUCH_3);
CASE_RETURN_STRING(TAP_STATE_TOUCH_3_HOLD);
CASE_RETURN_STRING(TAP_STATE_DRAGGING);
CASE_RETURN_STRING(TAP_STATE_DRAGGING_WAIT);
CASE_RETURN_STRING(TAP_STATE_DRAGGING_OR_DOUBLETAP);
CASE_RETURN_STRING(TAP_STATE_DRAGGING_2);
CASE_RETURN_STRING(TAP_STATE_DEAD);
}
return NULL;
}
static inline const char*
tap_event_to_str(enum tap_event event) {
switch(event) {
CASE_RETURN_STRING(TAP_EVENT_TOUCH);
CASE_RETURN_STRING(TAP_EVENT_MOTION);
CASE_RETURN_STRING(TAP_EVENT_RELEASE);
CASE_RETURN_STRING(TAP_EVENT_TIMEOUT);
CASE_RETURN_STRING(TAP_EVENT_BUTTON);
}
return NULL;
}
#undef CASE_RETURN_STRING
static void
tp_tap_notify(struct tp_dispatch *tp,
uint32_t time,
int nfingers,
enum libinput_pointer_button_state state)
{
int32_t button;
switch (nfingers) {
case 1: button = BTN_LEFT; break;
case 2: button = BTN_RIGHT; break;
case 3: button = BTN_MIDDLE; break;
default:
return;
}
pointer_notify_button(&tp->device->base,
time,
button,
state);
}
static void
tp_tap_set_timer(struct tp_dispatch *tp, uint32_t time)
{
uint32_t timeout = time + DEFAULT_TAP_TIMEOUT_PERIOD;
struct itimerspec its;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0;
its.it_value.tv_sec = timeout / 1000;
its.it_value.tv_nsec = (timeout % 1000) * 1000 * 1000;
timerfd_settime(tp->tap.timer_fd, TFD_TIMER_ABSTIME, &its, NULL);
tp->tap.timeout = timeout;
}
static void
tp_tap_clear_timer(struct tp_dispatch *tp)
{
tp->tap.timeout = 0;
}
static void
tp_tap_idle_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_TOUCH;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
case TAP_EVENT_MOTION:
log_info("invalid event, no fingers are down\n");
break;
case TAP_EVENT_TIMEOUT:
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_touch_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_TOUCH_2;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_TAPPED;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_PRESSED);
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_TIMEOUT:
case TAP_EVENT_MOTION:
tp->tap.state = TAP_STATE_HOLD;
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_hold_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_TOUCH_2;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_IDLE;
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_tapped_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_MOTION:
case TAP_EVENT_RELEASE:
log_info("invalid event when fingers are up\n");
break;
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DRAGGING_OR_DOUBLETAP;
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_IDLE;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
}
}
static void
tp_tap_touch2_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_TOUCH_3;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_HOLD;
tp_tap_notify(tp, time, 2, LIBINPUT_POINTER_BUTTON_STATE_PRESSED);
tp_tap_notify(tp, time, 2, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_MOTION:
tp_tap_clear_timer(tp);
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_TOUCH_2_HOLD;
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_touch2_hold_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_TOUCH_3;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_HOLD;
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_TOUCH_2_HOLD;
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_touch3_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_TOUCH_3_HOLD;
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_TOUCH_2_HOLD;
tp_tap_notify(tp, time, 3, LIBINPUT_POINTER_BUTTON_STATE_PRESSED);
tp_tap_notify(tp, time, 3, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_touch3_hold_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_TOUCH_2_HOLD;
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
break;
}
}
static void
tp_tap_dragging_or_doubletap_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DRAGGING_2;
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_IDLE;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_PRESSED);
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_DRAGGING;
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
}
}
static void
tp_tap_dragging_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DRAGGING_2;
break;
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_DRAGGING_WAIT;
tp_tap_set_timer(tp, time);
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
/* noop */
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
}
}
static void
tp_tap_dragging_wait_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DRAGGING;
tp_tap_clear_timer(tp);
break;
case TAP_EVENT_RELEASE:
case TAP_EVENT_MOTION:
break;
case TAP_EVENT_TIMEOUT:
tp->tap.state = TAP_STATE_IDLE;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
}
}
static void
tp_tap_dragging2_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_RELEASE:
tp->tap.state = TAP_STATE_DRAGGING;
break;
case TAP_EVENT_TOUCH:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
/* noop */
break;
case TAP_EVENT_BUTTON:
tp->tap.state = TAP_STATE_DEAD;
tp_tap_notify(tp, time, 1, LIBINPUT_POINTER_BUTTON_STATE_RELEASED);
break;
}
}
static void
tp_tap_dead_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
switch (event) {
case TAP_EVENT_RELEASE:
if (tp->nfingers_down == 0)
tp->tap.state = TAP_STATE_IDLE;
break;
case TAP_EVENT_TOUCH:
case TAP_EVENT_MOTION:
case TAP_EVENT_TIMEOUT:
case TAP_EVENT_BUTTON:
break;
}
}
static void
tp_tap_handle_event(struct tp_dispatch *tp, enum tap_event event, uint32_t time)
{
enum tp_tap_state current;
if (!tp->tap.enabled)
return;
current = tp->tap.state;
switch(tp->tap.state) {
case TAP_STATE_IDLE:
tp_tap_idle_handle_event(tp, event, time);
break;
case TAP_STATE_TOUCH:
tp_tap_touch_handle_event(tp, event, time);
break;
case TAP_STATE_HOLD:
tp_tap_hold_handle_event(tp, event, time);
break;
case TAP_STATE_TAPPED:
tp_tap_tapped_handle_event(tp, event, time);
break;
case TAP_STATE_TOUCH_2:
tp_tap_touch2_handle_event(tp, event, time);
break;
case TAP_STATE_TOUCH_2_HOLD:
tp_tap_touch2_hold_handle_event(tp, event, time);
break;
case TAP_STATE_TOUCH_3:
tp_tap_touch3_handle_event(tp, event, time);
break;
case TAP_STATE_TOUCH_3_HOLD:
tp_tap_touch3_hold_handle_event(tp, event, time);
break;
case TAP_STATE_DRAGGING_OR_DOUBLETAP:
tp_tap_dragging_or_doubletap_handle_event(tp, event, time);
break;
case TAP_STATE_DRAGGING:
tp_tap_dragging_handle_event(tp, event, time);
break;
case TAP_STATE_DRAGGING_WAIT:
tp_tap_dragging_wait_handle_event(tp, event, time);
break;
case TAP_STATE_DRAGGING_2:
tp_tap_dragging2_handle_event(tp, event, time);
break;
case TAP_STATE_DEAD:
tp_tap_dead_handle_event(tp, event, time);
break;
}
if (tp->tap.state == TAP_STATE_IDLE || tp->tap.state == TAP_STATE_DEAD)
tp_tap_clear_timer(tp);
log_debug("%s → %s → %s\n", tap_state_to_str(current), tap_event_to_str(event), tap_state_to_str(tp->tap.state));
}
static bool
tp_tap_exceeds_motion_threshold(struct tp_dispatch *tp, struct tp_touch *t)
{
int threshold = DEFAULT_TAP_MOVE_THRESHOLD;
double dx, dy;
tp_get_delta(t, &dx, &dy);
return dx * dx + dy * dy > threshold * threshold;
}
int
tp_tap_handle_state(struct tp_dispatch *tp, uint32_t time)
{
struct tp_touch *t;
if (tp->queued & TOUCHPAD_EVENT_BUTTON_PRESS)
tp_tap_handle_event(tp, TAP_EVENT_BUTTON, time);
tp_for_each_touch(tp, t) {
if (!t->dirty || t->state == TOUCH_NONE)
continue;
if (t->state == TOUCH_BEGIN)
tp_tap_handle_event(tp, TAP_EVENT_TOUCH, time);
else if (t->state == TOUCH_END)
tp_tap_handle_event(tp, TAP_EVENT_RELEASE, time);
else if (tp->tap.state != TAP_STATE_IDLE &&
tp_tap_exceeds_motion_threshold(tp, t))
tp_tap_handle_event(tp, TAP_EVENT_MOTION, time);
}
return 0;
}
static void
tp_tap_timeout_handler(void *data)
{
struct tp_dispatch *touchpad = data;
uint64_t expires;
int len;
struct timespec ts;
uint32_t now;
len = read(touchpad->tap.timer_fd, &expires, sizeof expires);
if (len != sizeof expires)
/* This will only happen if the application made the fd
* non-blocking, but this function should only be called
* upon the timeout, so lets continue anyway. */
fprintf(stderr, "timerfd read error: %m\n");
clock_gettime(CLOCK_MONOTONIC, &ts);
now = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
tp_tap_handle_timeout(touchpad, now);
}
unsigned int
tp_tap_handle_timeout(struct tp_dispatch *tp, uint32_t time)
{
if (!tp->tap.enabled)
return 0;
if (tp->tap.timeout && tp->tap.timeout <= time) {
tp_tap_clear_timer(tp);
tp_tap_handle_event(tp, TAP_EVENT_TIMEOUT, time);
}
return tp->tap.timeout;
}
int
tp_init_tap(struct tp_dispatch *tp)
{
tp->tap.state = TAP_STATE_IDLE;
tp->tap.timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
if (tp->tap.timer_fd == -1)
return -1;
tp->tap.source =
libinput_add_fd(tp->device->base.seat->libinput,
tp->tap.timer_fd,
tp_tap_timeout_handler,
tp);
if (tp->tap.source == NULL) {
close(tp->tap.timer_fd);
return -1;
}
tp->tap.enabled = 1; /* FIXME */
return 0;
}

4
src/evdev-mt-touchpad.c
View file

@ -369,6 +369,7 @@ tp_post_events(struct tp_dispatch *tp, uint32_t time)
return;
}
tp_tap_handle_state(tp, time);
if (t->history.count < 4)
return;
@ -487,6 +488,9 @@ tp_init(struct tp_dispatch *tp,
if (tp_init_accel(tp, diagonal) != 0)
return -1;
if (tp_init_tap(tp) != 0)
return -1;
return 0;
}

33
src/evdev-mt-touchpad.h
View file

@ -45,6 +45,22 @@ enum touch_state {
TOUCH_END
};
enum tp_tap_state {
TAP_STATE_IDLE = 4,
TAP_STATE_TOUCH,
TAP_STATE_HOLD,
TAP_STATE_TAPPED,
TAP_STATE_TOUCH_2,
TAP_STATE_TOUCH_2_HOLD,
TAP_STATE_TOUCH_3,
TAP_STATE_TOUCH_3_HOLD,
TAP_STATE_DRAGGING_OR_DOUBLETAP,
TAP_STATE_DRAGGING,
TAP_STATE_DRAGGING_WAIT,
TAP_STATE_DRAGGING_2,
TAP_STATE_DEAD, /**< finger count exceeded */
};
struct tp_motion {
int32_t x;
int32_t y;
@ -97,6 +113,14 @@ struct tp_dispatch {
} buttons; /* physical buttons */
enum touchpad_event queued;
struct {
bool enabled;
int timer_fd;
struct libinput_source *source;
unsigned int timeout;
enum tp_tap_state state;
} tap;
};
#define tp_for_each_touch(_tp, _t) \
@ -105,4 +129,13 @@ struct tp_dispatch {
void
tp_get_delta(struct tp_touch *t, double *dx, double *dy);
int
tp_tap_handle_state(struct tp_dispatch *tp, uint32_t time);
unsigned int
tp_tap_handle_timeout(struct tp_dispatch *tp, uint32_t time);
int
tp_init_tap(struct tp_dispatch *tp);
#endif