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weston/src/evdev-touchpad.c
Neil Roberts daf7d4774b evdev: Only track one pending event 
Instead of having a mask of pending events there is now an enum with a
single value to represent the one pending event. The event gets
flushed explicitly as part of the handling code for each event type
rather than in the outer event reading loop. The pending event is used
so that we can combine multiple motion events into one and to make
sure that we have recieved the latest position before sending a touch
up or down event. This should fix the following problems with the old
approach:

• If you release a finger and press it down again quickly you could
  get the up and down events in the same batch. However the pending
  events were always processed in the order down then up so it would
  end up notifying two down events and then an up. The pending event
  is now always flushed when there is a new up or down event so they
  will always be in the right order.

• When it got a slot event it would immediately change the slot number
  and then set the pending event. Then when it flushed the events it
  would use the new slot number to flush the old pending event so the
  events could have the wrong finger. The pending event is now
  immediately flushed when a slot event is received so it will have
  the right finger.

• If you get more than 32 events in one read then it was resetting the
  pending events before processing the next batch in
  evdev_process_events. If four fingers were pressed down at once then
  it ended up with more than 32 events and the sync message would be
  in the second batch. The pending flag for the last finger was
  getting cleared so it never got emitted. In this patch the pending
  event is no longer reset after reading nor is it explicitly flushed.
  Instead it is flushed when we receive a EV_SYN event or a different
  pending event needs to replace it.

The touchpad handling code was trying to use the pending event
mechanism to notify the relative motion events. I'm not sure why it
was doing this because it looks the event would effectively get
emitted as soon as the touchpad_process function is finished anyway
and it wasn't accumulating the values. Instead I've just changed it to
emit the event directly.

https://bugs.freedesktop.org/show_bug.cgi?id=67563
2013-09-24 16:22:19 -07:00

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/*
* Copyright © 2012 Jonas Ådahl
*
* 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 the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS 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.
*/
#include "config.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <linux/input.h>
#include "filter.h"
#include "evdev.h"
#include "../shared/config-parser.h"
/* Default values */
#define DEFAULT_CONSTANT_ACCEL_NUMERATOR 50
#define DEFAULT_MIN_ACCEL_FACTOR 0.16
#define DEFAULT_MAX_ACCEL_FACTOR 1.0
#define DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR 700.0
#define DEFAULT_TOUCHPAD_SINGLE_TAP_BUTTON BTN_LEFT
#define DEFAULT_TOUCHPAD_SINGLE_TAP_TIMEOUT 100
enum touchpad_model {
TOUCHPAD_MODEL_UNKNOWN = 0,
TOUCHPAD_MODEL_SYNAPTICS,
TOUCHPAD_MODEL_ALPS,
TOUCHPAD_MODEL_APPLETOUCH,
TOUCHPAD_MODEL_ELANTECH
};
enum touchpad_event {
TOUCHPAD_EVENT_NONE = 0,
TOUCHPAD_EVENT_ABSOLUTE_ANY = (1 << 0),
TOUCHPAD_EVENT_ABSOLUTE_X = (1 << 1),
TOUCHPAD_EVENT_ABSOLUTE_Y = (1 << 2),
TOUCHPAD_EVENT_REPORT = (1 << 3)
};
struct touchpad_model_spec {
short vendor;
short product;
enum touchpad_model model;
};
static struct touchpad_model_spec touchpad_spec_table[] = {
{0x0002, 0x0007, TOUCHPAD_MODEL_SYNAPTICS},
{0x0002, 0x0008, TOUCHPAD_MODEL_ALPS},
{0x05ac, 0x0000, TOUCHPAD_MODEL_APPLETOUCH},
{0x0002, 0x000e, TOUCHPAD_MODEL_ELANTECH},
{0x0000, 0x0000, TOUCHPAD_MODEL_UNKNOWN}
};
enum touchpad_state {
TOUCHPAD_STATE_NONE = 0,
TOUCHPAD_STATE_TOUCH = (1 << 0),
TOUCHPAD_STATE_MOVE = (1 << 1)
};
#define TOUCHPAD_HISTORY_LENGTH 4
struct touchpad_motion {
int32_t x;
int32_t y;
};
enum touchpad_fingers_state {
TOUCHPAD_FINGERS_ONE = (1 << 0),
TOUCHPAD_FINGERS_TWO = (1 << 1),
TOUCHPAD_FINGERS_THREE = (1 << 2)
};
enum fsm_event {
FSM_EVENT_TOUCH,
FSM_EVENT_RELEASE,
FSM_EVENT_MOTION,
FSM_EVENT_TIMEOUT
};
enum fsm_state {
FSM_IDLE,
FSM_TOUCH,
FSM_TAP,
FSM_TAP_2,
FSM_DRAG
};
struct touchpad_dispatch {
struct evdev_dispatch base;
struct evdev_device *device;
enum touchpad_model model;
unsigned int state;
int finger_state;
int last_finger_state;
double constant_accel_factor;
double min_accel_factor;
double max_accel_factor;
unsigned int event_mask;
unsigned int event_mask_filter;
int reset;
struct {
bool enable;
struct wl_array events;
enum fsm_state state;
struct wl_event_source *timer_source;
} fsm;
struct {
int32_t x;
int32_t y;
} hw_abs;
int has_pressure;
struct {
int32_t touch_low;
int32_t touch_high;
} pressure;
struct {
int32_t margin_x;
int32_t margin_y;
int32_t center_x;
int32_t center_y;
} hysteresis;
struct touchpad_motion motion_history[TOUCHPAD_HISTORY_LENGTH];
int motion_index;
unsigned int motion_count;
struct weston_motion_filter *filter;
};
static enum touchpad_model
get_touchpad_model(struct evdev_device *device)
{
struct input_id id;
unsigned int i;
if (ioctl(device->fd, EVIOCGID, &id) < 0)
return TOUCHPAD_MODEL_UNKNOWN;
for (i = 0; i < ARRAY_LENGTH(touchpad_spec_table); i++)
if (touchpad_spec_table[i].vendor == id.vendor &&
(!touchpad_spec_table[i].product ||
touchpad_spec_table[i].product == id.product))
return touchpad_spec_table[i].model;
return TOUCHPAD_MODEL_UNKNOWN;
}
static void
configure_touchpad_pressure(struct touchpad_dispatch *touchpad,
int32_t pressure_min, int32_t pressure_max)
{
int32_t range = pressure_max - pressure_min + 1;
touchpad->has_pressure = 1;
/* Magic numbers from xf86-input-synaptics */
switch (touchpad->model) {
case TOUCHPAD_MODEL_ELANTECH:
touchpad->pressure.touch_low = pressure_min + 1;
touchpad->pressure.touch_high = pressure_min + 1;
break;
default:
touchpad->pressure.touch_low =
pressure_min + range * (25.0/256.0);
touchpad->pressure.touch_high =
pressure_min + range * (30.0/256.0);
}
}
static double
touchpad_profile(struct weston_motion_filter *filter,
void *data,
double velocity,
uint32_t time)
{
struct touchpad_dispatch *touchpad =
(struct touchpad_dispatch *) data;
double accel_factor;
accel_factor = velocity * touchpad->constant_accel_factor;
if (accel_factor > touchpad->max_accel_factor)
accel_factor = touchpad->max_accel_factor;
else if (accel_factor < touchpad->min_accel_factor)
accel_factor = touchpad->min_accel_factor;
return accel_factor;
}
static inline struct touchpad_motion *
motion_history_offset(struct touchpad_dispatch *touchpad, int offset)
{
int offset_index =
(touchpad->motion_index - offset + TOUCHPAD_HISTORY_LENGTH) %
TOUCHPAD_HISTORY_LENGTH;
return &touchpad->motion_history[offset_index];
}
static double
estimate_delta(int x0, int x1, int x2, int x3)
{
return (x0 + x1 - x2 - x3) / 4;
}
static int
hysteresis(int in, int center, int margin)
{
int diff = in - center;
if (abs(diff) <= margin)
return center;
if (diff > margin)
return center + diff - margin;
else if (diff < -margin)
return center + diff + margin;
return center + diff;
}
static void
touchpad_get_delta(struct touchpad_dispatch *touchpad, double *dx, double *dy)
{
*dx = estimate_delta(motion_history_offset(touchpad, 0)->x,
motion_history_offset(touchpad, 1)->x,
motion_history_offset(touchpad, 2)->x,
motion_history_offset(touchpad, 3)->x);
*dy = estimate_delta(motion_history_offset(touchpad, 0)->y,
motion_history_offset(touchpad, 1)->y,
motion_history_offset(touchpad, 2)->y,
motion_history_offset(touchpad, 3)->y);
}
static void
filter_motion(struct touchpad_dispatch *touchpad,
double *dx, double *dy, uint32_t time)
{
struct weston_motion_params motion;
motion.dx = *dx;
motion.dy = *dy;
weston_filter_dispatch(touchpad->filter, &motion, touchpad, time);
*dx = motion.dx;
*dy = motion.dy;
}
static void
notify_button_pressed(struct touchpad_dispatch *touchpad, uint32_t time)
{
notify_button(touchpad->device->seat, time,
DEFAULT_TOUCHPAD_SINGLE_TAP_BUTTON,
WL_POINTER_BUTTON_STATE_PRESSED);
}
static void
notify_button_released(struct touchpad_dispatch *touchpad, uint32_t time)
{
notify_button(touchpad->device->seat, time,
DEFAULT_TOUCHPAD_SINGLE_TAP_BUTTON,
WL_POINTER_BUTTON_STATE_RELEASED);
}
static void
notify_tap(struct touchpad_dispatch *touchpad, uint32_t time)
{
notify_button_pressed(touchpad, time);
notify_button_released(touchpad, time);
}
static void
process_fsm_events(struct touchpad_dispatch *touchpad, uint32_t time)
{
uint32_t timeout = UINT32_MAX;
enum fsm_event *pevent;
enum fsm_event event;
if (!touchpad->fsm.enable)
return;
if (touchpad->fsm.events.size == 0)
return;
wl_array_for_each(pevent, &touchpad->fsm.events) {
event = *pevent;
timeout = 0;
switch (touchpad->fsm.state) {
case FSM_IDLE:
switch (event) {
case FSM_EVENT_TOUCH:
touchpad->fsm.state = FSM_TOUCH;
break;
default:
break;
}
break;
case FSM_TOUCH:
switch (event) {
case FSM_EVENT_RELEASE:
timeout = DEFAULT_TOUCHPAD_SINGLE_TAP_TIMEOUT;
touchpad->fsm.state = FSM_TAP;
break;
default:
touchpad->fsm.state = FSM_IDLE;
break;
}
break;
case FSM_TAP:
switch (event) {
case FSM_EVENT_TIMEOUT:
notify_tap(touchpad, time);
touchpad->fsm.state = FSM_IDLE;
break;
case FSM_EVENT_TOUCH:
notify_button_pressed(touchpad, time);
touchpad->fsm.state = FSM_TAP_2;
break;
default:
touchpad->fsm.state = FSM_IDLE;
break;
}
break;
case FSM_TAP_2:
switch (event) {
case FSM_EVENT_MOTION:
touchpad->fsm.state = FSM_DRAG;
break;
case FSM_EVENT_RELEASE:
notify_button_released(touchpad, time);
notify_tap(touchpad, time);
touchpad->fsm.state = FSM_IDLE;
break;
default:
touchpad->fsm.state = FSM_IDLE;
break;
}
break;
case FSM_DRAG:
switch (event) {
case FSM_EVENT_RELEASE:
notify_button_released(touchpad, time);
touchpad->fsm.state = FSM_IDLE;
break;
default:
touchpad->fsm.state = FSM_IDLE;
break;
}
break;
default:
weston_log("evdev-touchpad: Unknown state %d",
touchpad->fsm.state);
touchpad->fsm.state = FSM_IDLE;
break;
}
}
if (timeout != UINT32_MAX)
wl_event_source_timer_update(touchpad->fsm.timer_source,
timeout);
wl_array_release(&touchpad->fsm.events);
wl_array_init(&touchpad->fsm.events);
}
static void
push_fsm_event(struct touchpad_dispatch *touchpad,
enum fsm_event event)
{
enum fsm_event *pevent;
if (!touchpad->fsm.enable)
return;
pevent = wl_array_add(&touchpad->fsm.events, sizeof event);
if (pevent)
*pevent = event;
else
touchpad->fsm.state = FSM_IDLE;
}
static int
fsm_timout_handler(void *data)
{
struct touchpad_dispatch *touchpad = data;
if (touchpad->fsm.events.size == 0) {
push_fsm_event(touchpad, FSM_EVENT_TIMEOUT);
process_fsm_events(touchpad, weston_compositor_get_time());
}
return 1;
}
static void
touchpad_update_state(struct touchpad_dispatch *touchpad, uint32_t time)
{
int motion_index;
int center_x, center_y;
double dx = 0.0, dy = 0.0;
if (touchpad->reset ||
touchpad->last_finger_state != touchpad->finger_state) {
touchpad->reset = 0;
touchpad->motion_count = 0;
touchpad->event_mask = TOUCHPAD_EVENT_NONE;
touchpad->event_mask_filter =
TOUCHPAD_EVENT_ABSOLUTE_X | TOUCHPAD_EVENT_ABSOLUTE_Y;
touchpad->last_finger_state = touchpad->finger_state;
process_fsm_events(touchpad, time);
return;
}
touchpad->last_finger_state = touchpad->finger_state;
if (!(touchpad->event_mask & TOUCHPAD_EVENT_REPORT))
return;
else
touchpad->event_mask &= ~TOUCHPAD_EVENT_REPORT;
if ((touchpad->event_mask & touchpad->event_mask_filter) !=
touchpad->event_mask_filter)
return;
touchpad->event_mask_filter = TOUCHPAD_EVENT_ABSOLUTE_ANY;
touchpad->event_mask = 0;
/* Avoid noice by moving center only when delta reaches a threshold
* distance from the old center. */
if (touchpad->motion_count > 0) {
center_x = hysteresis(touchpad->hw_abs.x,
touchpad->hysteresis.center_x,
touchpad->hysteresis.margin_x);
center_y = hysteresis(touchpad->hw_abs.y,
touchpad->hysteresis.center_y,
touchpad->hysteresis.margin_y);
} else {
center_x = touchpad->hw_abs.x;
center_y = touchpad->hw_abs.y;
}
touchpad->hysteresis.center_x = center_x;
touchpad->hysteresis.center_y = center_y;
touchpad->hw_abs.x = center_x;
touchpad->hw_abs.y = center_y;
/* Update motion history tracker */
motion_index = (touchpad->motion_index + 1) % TOUCHPAD_HISTORY_LENGTH;
touchpad->motion_index = motion_index;
touchpad->motion_history[motion_index].x = touchpad->hw_abs.x;
touchpad->motion_history[motion_index].y = touchpad->hw_abs.y;
if (touchpad->motion_count < 4)
touchpad->motion_count++;
if (touchpad->motion_count >= 4) {
touchpad_get_delta(touchpad, &dx, &dy);
filter_motion(touchpad, &dx, &dy, time);
if (touchpad->finger_state == TOUCHPAD_FINGERS_ONE) {
notify_motion(touchpad->device->seat, time,
wl_fixed_from_double(dx),
wl_fixed_from_double(dy));
} else if (touchpad->finger_state == TOUCHPAD_FINGERS_TWO) {
if (dx != 0.0)
notify_axis(touchpad->device->seat,
time,
WL_POINTER_AXIS_HORIZONTAL_SCROLL,
wl_fixed_from_double(dx));
if (dy != 0.0)
notify_axis(touchpad->device->seat,
time,
WL_POINTER_AXIS_VERTICAL_SCROLL,
wl_fixed_from_double(dy));
}
}
if (!(touchpad->state & TOUCHPAD_STATE_MOVE) &&
((int)dx || (int)dy)) {
touchpad->state |= TOUCHPAD_STATE_MOVE;
push_fsm_event(touchpad, FSM_EVENT_MOTION);
}
process_fsm_events(touchpad, time);
}
static void
on_touch(struct touchpad_dispatch *touchpad)
{
touchpad->state |= TOUCHPAD_STATE_TOUCH;
push_fsm_event(touchpad, FSM_EVENT_TOUCH);
}
static void
on_release(struct touchpad_dispatch *touchpad)
{
touchpad->reset = 1;
touchpad->state &= ~(TOUCHPAD_STATE_MOVE | TOUCHPAD_STATE_TOUCH);
push_fsm_event(touchpad, FSM_EVENT_RELEASE);
}
static inline void
process_absolute(struct touchpad_dispatch *touchpad,
struct evdev_device *device,
struct input_event *e)
{
switch (e->code) {
case ABS_PRESSURE:
if (e->value > touchpad->pressure.touch_high &&
!(touchpad->state & TOUCHPAD_STATE_TOUCH))
on_touch(touchpad);
else if (e->value < touchpad->pressure.touch_low &&
touchpad->state & TOUCHPAD_STATE_TOUCH)
on_release(touchpad);
break;
case ABS_X:
if (touchpad->state & TOUCHPAD_STATE_TOUCH) {
touchpad->hw_abs.x = e->value;
touchpad->event_mask |= TOUCHPAD_EVENT_ABSOLUTE_ANY;
touchpad->event_mask |= TOUCHPAD_EVENT_ABSOLUTE_X;
}
break;
case ABS_Y:
if (touchpad->state & TOUCHPAD_STATE_TOUCH) {
touchpad->hw_abs.y = e->value;
touchpad->event_mask |= TOUCHPAD_EVENT_ABSOLUTE_ANY;
touchpad->event_mask |= TOUCHPAD_EVENT_ABSOLUTE_Y;
}
break;
}
}
static inline void
process_key(struct touchpad_dispatch *touchpad,
struct evdev_device *device,
struct input_event *e,
uint32_t time)
{
uint32_t code;
switch (e->code) {
case BTN_TOUCH:
if (!touchpad->has_pressure) {
if (e->value && !(touchpad->state & TOUCHPAD_STATE_TOUCH))
on_touch(touchpad);
else if (!e->value)
on_release(touchpad);
}
break;
case BTN_LEFT:
case BTN_RIGHT:
case BTN_MIDDLE:
case BTN_SIDE:
case BTN_EXTRA:
case BTN_FORWARD:
case BTN_BACK:
case BTN_TASK:
if (!touchpad->fsm.enable && e->code == BTN_LEFT &&
touchpad->finger_state == TOUCHPAD_FINGERS_TWO)
code = BTN_RIGHT;
else
code = e->code;
notify_button(device->seat, time, code,
e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
WL_POINTER_BUTTON_STATE_RELEASED);
break;
case BTN_TOOL_PEN:
case BTN_TOOL_RUBBER:
case BTN_TOOL_BRUSH:
case BTN_TOOL_PENCIL:
case BTN_TOOL_AIRBRUSH:
case BTN_TOOL_MOUSE:
case BTN_TOOL_LENS:
touchpad->reset = 1;
break;
case BTN_TOOL_FINGER:
if (e->value)
touchpad->finger_state |= TOUCHPAD_FINGERS_ONE;
else
touchpad->finger_state &= ~TOUCHPAD_FINGERS_ONE;
break;
case BTN_TOOL_DOUBLETAP:
if (e->value)
touchpad->finger_state |= TOUCHPAD_FINGERS_TWO;
else
touchpad->finger_state &= ~TOUCHPAD_FINGERS_TWO;
break;
case BTN_TOOL_TRIPLETAP:
if (e->value)
touchpad->finger_state |= TOUCHPAD_FINGERS_THREE;
else
touchpad->finger_state &= ~TOUCHPAD_FINGERS_THREE;
break;
}
}
static void
touchpad_process(struct evdev_dispatch *dispatch,
struct evdev_device *device,
struct input_event *e,
uint32_t time)
{
struct touchpad_dispatch *touchpad =
(struct touchpad_dispatch *) dispatch;
switch (e->type) {
case EV_SYN:
if (e->code == SYN_REPORT)
touchpad->event_mask |= TOUCHPAD_EVENT_REPORT;
break;
case EV_ABS:
process_absolute(touchpad, device, e);
break;
case EV_KEY:
process_key(touchpad, device, e, time);
break;
}
touchpad_update_state(touchpad, time);
}
static void
touchpad_destroy(struct evdev_dispatch *dispatch)
{
struct touchpad_dispatch *touchpad =
(struct touchpad_dispatch *) dispatch;
touchpad->filter->interface->destroy(touchpad->filter);
wl_event_source_remove(touchpad->fsm.timer_source);
free(dispatch);
}
struct evdev_dispatch_interface touchpad_interface = {
touchpad_process,
touchpad_destroy
};
static void
touchpad_parse_config(struct touchpad_dispatch *touchpad, double diagonal)
{
struct weston_compositor *compositor =
touchpad->device->seat->compositor;
struct weston_config_section *s;
double constant_accel_factor;
double min_accel_factor;
double max_accel_factor;
s = weston_config_get_section(compositor->config,
"touchpad", NULL, NULL);
weston_config_section_get_double(s, "constant_accel_factor",
&constant_accel_factor,
DEFAULT_CONSTANT_ACCEL_NUMERATOR);
weston_config_section_get_double(s, "min_accel_factor",
&min_accel_factor,
DEFAULT_MIN_ACCEL_FACTOR);
weston_config_section_get_double(s, "max_accel_factor",
&max_accel_factor,
DEFAULT_MAX_ACCEL_FACTOR);
touchpad->constant_accel_factor =
constant_accel_factor / diagonal;
touchpad->min_accel_factor = min_accel_factor;
touchpad->max_accel_factor = max_accel_factor;
}
static int
touchpad_init(struct touchpad_dispatch *touchpad,
struct evdev_device *device)
{
struct weston_motion_filter *accel;
struct wl_event_loop *loop;
unsigned long prop_bits[INPUT_PROP_MAX];
struct input_absinfo absinfo;
unsigned long abs_bits[NBITS(ABS_MAX)];
bool has_buttonpad;
double width;
double height;
double diagonal;
touchpad->base.interface = &touchpad_interface;
touchpad->device = device;
/* Detect model */
touchpad->model = get_touchpad_model(device);
ioctl(device->fd, EVIOCGPROP(sizeof(prop_bits)), prop_bits);
has_buttonpad = TEST_BIT(prop_bits, INPUT_PROP_BUTTONPAD);
/* Configure pressure */
ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)), abs_bits);
if (TEST_BIT(abs_bits, ABS_PRESSURE)) {
ioctl(device->fd, EVIOCGABS(ABS_PRESSURE), &absinfo);
configure_touchpad_pressure(touchpad,
absinfo.minimum,
absinfo.maximum);
}
/* Configure acceleration factor */
width = abs(device->abs.max_x - device->abs.min_x);
height = abs(device->abs.max_y - device->abs.min_y);
diagonal = sqrt(width*width + height*height);
touchpad_parse_config(touchpad, diagonal);
touchpad->hysteresis.margin_x =
diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
touchpad->hysteresis.margin_y =
diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
touchpad->hysteresis.center_x = 0;
touchpad->hysteresis.center_y = 0;
/* Configure acceleration profile */
accel = create_pointer_accelator_filter(touchpad_profile);
if (accel == NULL)
return -1;
touchpad->filter = accel;
/* Setup initial state */
touchpad->reset = 1;
memset(touchpad->motion_history, 0, sizeof touchpad->motion_history);
touchpad->motion_index = 0;
touchpad->motion_count = 0;
touchpad->state = TOUCHPAD_STATE_NONE;
touchpad->last_finger_state = 0;
touchpad->finger_state = 0;
wl_array_init(&touchpad->fsm.events);
touchpad->fsm.state = FSM_IDLE;
loop = wl_display_get_event_loop(device->seat->compositor->wl_display);
touchpad->fsm.timer_source =
wl_event_loop_add_timer(loop, fsm_timout_handler, touchpad);
if (touchpad->fsm.timer_source == NULL) {
accel->interface->destroy(accel);
return -1;
}
/* Configure */
touchpad->fsm.enable = !has_buttonpad;
return 0;
}
struct evdev_dispatch *
evdev_touchpad_create(struct evdev_device *device)
{
struct touchpad_dispatch *touchpad;
touchpad = malloc(sizeof *touchpad);
if (touchpad == NULL)
return NULL;
if (touchpad_init(touchpad, device) != 0) {
free(touchpad);
return NULL;
}
return &touchpad->base;
}
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