2 * Copyright © 2014 Red Hat, Inc.
4 * Permission to use, copy, modify, distribute, and sell this software and
5 * its documentation for any purpose is hereby granted without fee, provided
6 * that the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation, and that the name of the copyright holders not be used in
9 * advertising or publicity pertaining to distribution of the software
10 * without specific, written prior permission. The copyright holders make
11 * no representations about the suitability of this software for any
12 * purpose. It is provided "as is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
15 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
16 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
17 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
18 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
19 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29 #include "evdev-mt-touchpad.h"
31 #define DEFAULT_CONSTANT_ACCEL_NUMERATOR 100
32 #define DEFAULT_MIN_ACCEL_FACTOR 0.20
33 #define DEFAULT_MAX_ACCEL_FACTOR 0.40
34 #define DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR 700.0
37 tp_hysteresis(int in, int center, int margin)
39 int diff = in - center;
40 if (abs(diff) <= margin)
44 return center + diff - margin;
45 else if (diff < -margin)
46 return center + diff + margin;
51 tp_accel_profile(struct motion_filter *filter,
56 struct tp_dispatch *tp =
57 (struct tp_dispatch *) data;
61 accel_factor = velocity * tp->accel.constant_factor;
63 if (accel_factor > tp->accel.max_factor)
64 accel_factor = tp->accel.max_factor;
65 else if (accel_factor < tp->accel.min_factor)
66 accel_factor = tp->accel.min_factor;
71 static inline struct tp_motion *
72 tp_motion_history_offset(struct tp_touch *t, int offset)
75 (t->history.index - offset + TOUCHPAD_HISTORY_LENGTH) %
76 TOUCHPAD_HISTORY_LENGTH;
78 return &t->history.samples[offset_index];
82 tp_filter_motion(struct tp_dispatch *tp,
83 double *dx, double *dy, uint64_t time)
85 struct motion_params motion;
87 motion.dx = *dx * tp->accel.x_scale_coeff;
88 motion.dy = *dy * tp->accel.y_scale_coeff;
90 filter_dispatch(tp->filter, &motion, tp, time);
97 tp_motion_history_push(struct tp_touch *t)
99 int motion_index = (t->history.index + 1) % TOUCHPAD_HISTORY_LENGTH;
101 if (t->history.count < TOUCHPAD_HISTORY_LENGTH)
104 t->history.samples[motion_index].x = t->x;
105 t->history.samples[motion_index].y = t->y;
106 t->history.index = motion_index;
110 tp_motion_hysteresis(struct tp_dispatch *tp,
116 if (t->history.count == 0) {
117 t->hysteresis.center_x = t->x;
118 t->hysteresis.center_y = t->y;
121 t->hysteresis.center_x,
122 tp->hysteresis.margin_x);
124 t->hysteresis.center_y,
125 tp->hysteresis.margin_y);
126 t->hysteresis.center_x = x;
127 t->hysteresis.center_y = y;
134 tp_motion_history_reset(struct tp_touch *t)
136 t->history.count = 0;
139 static inline struct tp_touch *
140 tp_current_touch(struct tp_dispatch *tp)
142 return &tp->touches[min(tp->slot, tp->ntouches - 1)];
145 static inline struct tp_touch *
146 tp_get_touch(struct tp_dispatch *tp, unsigned int slot)
148 assert(slot < tp->ntouches);
149 return &tp->touches[slot];
153 tp_begin_touch(struct tp_dispatch *tp, struct tp_touch *t)
155 if (t->state != TOUCH_UPDATE) {
156 tp_motion_history_reset(t);
158 t->state = TOUCH_BEGIN;
159 t->pinned.is_pinned = false;
161 assert(tp->nfingers_down >= 1);
162 tp->queued |= TOUCHPAD_EVENT_MOTION;
167 tp_end_touch(struct tp_dispatch *tp, struct tp_touch *t)
169 if (t->state == TOUCH_NONE)
173 t->is_pointer = false;
174 t->state = TOUCH_END;
175 t->pinned.is_pinned = false;
176 assert(tp->nfingers_down >= 1);
178 tp->queued |= TOUCHPAD_EVENT_MOTION;
182 tp_estimate_delta(int x0, int x1, int x2, int x3)
184 return (x0 + x1 - x2 - x3) / 4;
188 tp_get_delta(struct tp_touch *t, double *dx, double *dy)
190 if (t->history.count < 4) {
196 *dx = tp_estimate_delta(tp_motion_history_offset(t, 0)->x,
197 tp_motion_history_offset(t, 1)->x,
198 tp_motion_history_offset(t, 2)->x,
199 tp_motion_history_offset(t, 3)->x);
200 *dy = tp_estimate_delta(tp_motion_history_offset(t, 0)->y,
201 tp_motion_history_offset(t, 1)->y,
202 tp_motion_history_offset(t, 2)->y,
203 tp_motion_history_offset(t, 3)->y);
207 tp_process_absolute(struct tp_dispatch *tp,
208 const struct input_event *e,
211 struct tp_touch *t = tp_current_touch(tp);
214 case ABS_MT_POSITION_X:
218 tp->queued |= TOUCHPAD_EVENT_MOTION;
220 case ABS_MT_POSITION_Y:
224 tp->queued |= TOUCHPAD_EVENT_MOTION;
229 case ABS_MT_TRACKING_ID:
232 tp_begin_touch(tp, t);
239 tp_process_absolute_st(struct tp_dispatch *tp,
240 const struct input_event *e,
243 struct tp_touch *t = tp_current_touch(tp);
250 tp->queued |= TOUCHPAD_EVENT_MOTION;
256 tp->queued |= TOUCHPAD_EVENT_MOTION;
262 tp_process_fake_touch(struct tp_dispatch *tp,
263 const struct input_event *e,
267 unsigned int fake_touches;
268 unsigned int nfake_touches;
272 if (e->code != BTN_TOUCH &&
273 (e->code < BTN_TOOL_DOUBLETAP || e->code > BTN_TOOL_QUADTAP))
276 shift = e->code == BTN_TOUCH ? 0 : (e->code - BTN_TOOL_DOUBLETAP + 1);
279 tp->fake_touches |= 1 << shift;
281 tp->fake_touches &= ~(0x1 << shift);
283 fake_touches = tp->fake_touches;
285 while (fake_touches) {
290 for (i = 0; i < tp->ntouches; i++) {
291 t = tp_get_touch(tp, i);
292 if (i >= nfake_touches) {
293 if (t->state != TOUCH_NONE) {
297 } else if (t->state != TOUCH_UPDATE &&
298 t->state != TOUCH_BEGIN) {
299 t->state = TOUCH_NONE;
300 tp_begin_touch(tp, t);
306 assert(tp->nfingers_down == nfake_touches);
310 tp_process_key(struct tp_dispatch *tp,
311 const struct input_event *e,
318 tp_process_button(tp, e, time);
321 case BTN_TOOL_DOUBLETAP:
322 case BTN_TOOL_TRIPLETAP:
323 case BTN_TOOL_QUADTAP:
325 tp_process_fake_touch(tp, e, time);
331 tp_unpin_finger(struct tp_dispatch *tp, struct tp_touch *t)
333 unsigned int xdist, ydist;
335 if (!t->pinned.is_pinned)
338 xdist = abs(t->x - t->pinned.center_x);
339 ydist = abs(t->y - t->pinned.center_y);
341 if (xdist * xdist + ydist * ydist >=
342 tp->buttons.motion_dist * tp->buttons.motion_dist) {
343 t->pinned.is_pinned = false;
344 tp_set_pointer(tp, t);
349 tp_pin_fingers(struct tp_dispatch *tp)
353 tp_for_each_touch(tp, t) {
354 t->is_pointer = false;
355 t->pinned.is_pinned = true;
356 t->pinned.center_x = t->x;
357 t->pinned.center_y = t->y;
362 tp_touch_active(struct tp_dispatch *tp, struct tp_touch *t)
364 return (t->state == TOUCH_BEGIN || t->state == TOUCH_UPDATE) &&
365 !t->pinned.is_pinned && tp_button_touch_active(tp, t);
369 tp_set_pointer(struct tp_dispatch *tp, struct tp_touch *t)
371 struct tp_touch *tmp = NULL;
373 /* Only set the touch as pointer if we don't have one yet */
374 tp_for_each_touch(tp, tmp) {
379 if (tp_touch_active(tp, t))
380 t->is_pointer = true;
384 tp_process_state(struct tp_dispatch *tp, uint64_t time)
387 struct tp_touch *first = tp_get_touch(tp, 0);
389 tp_for_each_touch(tp, t) {
390 if (!tp->has_mt && t != first && first->fake) {
394 t->dirty = first->dirty;
395 } else if (!t->dirty)
398 tp_motion_hysteresis(tp, t);
399 tp_motion_history_push(t);
401 tp_unpin_finger(tp, t);
404 tp_button_handle_state(tp, time);
407 * We have a physical button down event on a clickpad. To avoid
408 * spurious pointer moves by the clicking finger we pin all fingers.
409 * We unpin fingers when they move more then a certain threshold to
410 * to allow drag and drop.
412 if ((tp->queued & TOUCHPAD_EVENT_BUTTON_PRESS) &&
413 tp->buttons.is_clickpad)
418 tp_post_process_state(struct tp_dispatch *tp, uint64_t time)
422 tp_for_each_touch(tp, t) {
426 if (t->state == TOUCH_END) {
427 t->state = TOUCH_NONE;
429 } else if (t->state == TOUCH_BEGIN)
430 t->state = TOUCH_UPDATE;
435 tp->buttons.old_state = tp->buttons.state;
437 tp->queued = TOUCHPAD_EVENT_NONE;
441 tp_post_twofinger_scroll(struct tp_dispatch *tp, uint64_t time)
445 double dx = 0, dy =0;
448 tp_for_each_touch(tp, t) {
449 if (tp_touch_active(tp, t) && t->dirty) {
451 tp_get_delta(t, &tmpx, &tmpy);
456 /* Stop spurious MOTION events at the end of scrolling */
457 t->is_pointer = false;
466 tp_filter_motion(tp, &dx, &dy, time);
468 /* Require at least three px scrolling to start */
469 if (dy <= -3.0 || dy >= 3.0)
470 tp->scroll.direction |= (1 << LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL);
472 if (dx <= -3.0 || dx >= 3.0)
473 tp->scroll.direction |= (1 << LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL);
476 (tp->scroll.direction & (1 << LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL))) {
477 pointer_notify_axis(&tp->device->base,
479 LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL,
484 (tp->scroll.direction & (1 << LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL))) {
485 pointer_notify_axis(&tp->device->base,
487 LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL,
493 tp_stop_scroll_events(struct tp_dispatch *tp, uint64_t time)
495 /* terminate scrolling with a zero scroll event */
496 if (tp->scroll.direction & (1 << LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL))
497 pointer_notify_axis(&tp->device->base,
499 LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL,
501 if (tp->scroll.direction & (1 << LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL))
502 pointer_notify_axis(&tp->device->base,
504 LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL,
507 tp->scroll.direction = 0;
511 tp_post_scroll_events(struct tp_dispatch *tp, uint64_t time)
514 int nfingers_down = 0;
516 /* Only count active touches for 2 finger scrolling */
517 tp_for_each_touch(tp, t) {
518 if (tp_touch_active(tp, t))
522 if (nfingers_down != 2) {
523 tp_stop_scroll_events(tp, time);
527 tp_post_twofinger_scroll(tp, time);
532 tp_post_events(struct tp_dispatch *tp, uint64_t time)
534 struct tp_touch *t = tp_current_touch(tp);
538 consumed |= tp_tap_handle_state(tp, time);
539 consumed |= tp_post_button_events(tp, time);
542 tp_stop_scroll_events(tp, time);
546 if (tp_post_scroll_events(tp, time) != 0)
549 if (t->history.count >= TOUCHPAD_MIN_SAMPLES) {
550 if (!t->is_pointer) {
551 tp_for_each_touch(tp, t) {
560 tp_get_delta(t, &dx, &dy);
561 tp_filter_motion(tp, &dx, &dy, time);
563 if (dx != 0.0 || dy != 0.0)
564 pointer_notify_motion(&tp->device->base, time, dx, dy);
569 tp_process(struct evdev_dispatch *dispatch,
570 struct evdev_device *device,
571 struct input_event *e,
574 struct tp_dispatch *tp =
575 (struct tp_dispatch *)dispatch;
580 tp_process_absolute(tp, e, time);
582 tp_process_absolute_st(tp, e, time);
585 tp_process_key(tp, e, time);
588 tp_process_state(tp, time);
589 tp_post_events(tp, time);
590 tp_post_process_state(tp, time);
596 tp_destroy(struct evdev_dispatch *dispatch)
598 struct tp_dispatch *tp =
599 (struct tp_dispatch*)dispatch;
602 tp_destroy_buttons(tp);
604 motion_filter_destroy(tp->filter);
609 static struct evdev_dispatch_interface tp_interface = {
615 tp_init_touch(struct tp_dispatch *tp,
622 tp_init_slots(struct tp_dispatch *tp,
623 struct evdev_device *device)
626 const struct input_absinfo *absinfo;
628 absinfo = libevdev_get_abs_info(device->evdev, ABS_MT_SLOT);
630 tp->ntouches = absinfo->maximum + 1;
631 tp->slot = absinfo->value;
638 { BTN_TOOL_QUINTTAP, 5 },
639 { BTN_TOOL_QUADTAP, 4 },
640 { BTN_TOOL_TRIPLETAP, 3 },
641 { BTN_TOOL_DOUBLETAP, 2 },
649 ARRAY_FOR_EACH(max_touches, m) {
650 if (libevdev_has_event_code(device->evdev,
653 tp->ntouches = m->ntouches;
658 tp->touches = calloc(tp->ntouches,
659 sizeof(struct tp_touch));
663 for (i = 0; i < tp->ntouches; i++)
664 tp_init_touch(tp, &tp->touches[i]);
670 calculate_scale_coefficients(struct tp_dispatch *tp)
675 res_x = libevdev_get_abs_resolution(tp->device->evdev,
677 res_y = libevdev_get_abs_resolution(tp->device->evdev,
680 res_x = libevdev_get_abs_resolution(tp->device->evdev,
682 res_y = libevdev_get_abs_resolution(tp->device->evdev,
686 if (res_x <= 0 || res_y <= 0) {
687 tp->accel.x_scale_coeff = 1.0;
688 tp->accel.y_scale_coeff = 1.0;
689 } else if (res_x > res_y) {
690 tp->accel.x_scale_coeff = res_y / (double) res_x;
691 tp->accel.y_scale_coeff = 1.0f;
693 tp->accel.y_scale_coeff = res_x / (double) res_y;
694 tp->accel.x_scale_coeff = 1.0f;
699 tp_init_accel(struct tp_dispatch *touchpad, double diagonal)
701 struct motion_filter *accel;
703 calculate_scale_coefficients(touchpad);
705 touchpad->accel.constant_factor =
706 DEFAULT_CONSTANT_ACCEL_NUMERATOR / diagonal;
707 touchpad->accel.min_factor = DEFAULT_MIN_ACCEL_FACTOR;
708 touchpad->accel.max_factor = DEFAULT_MAX_ACCEL_FACTOR;
710 accel = create_pointer_accelator_filter(tp_accel_profile);
714 touchpad->filter = accel;
720 tp_init_scroll(struct tp_dispatch *tp)
722 tp->scroll.direction = 0;
728 tp_init(struct tp_dispatch *tp,
729 struct evdev_device *device)
734 tp->base.interface = &tp_interface;
737 if (tp_init_slots(tp, device) != 0)
740 width = abs(device->abs.absinfo_x->maximum -
741 device->abs.absinfo_x->minimum);
742 height = abs(device->abs.absinfo_y->maximum -
743 device->abs.absinfo_y->minimum);
744 diagonal = sqrt(width*width + height*height);
746 tp->hysteresis.margin_x =
747 diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
748 tp->hysteresis.margin_y =
749 diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
751 if (tp_init_scroll(tp) != 0)
754 if (tp_init_accel(tp, diagonal) != 0)
757 if (tp_init_tap(tp) != 0)
760 if (tp_init_buttons(tp, device) != 0)
766 struct evdev_dispatch *
767 evdev_mt_touchpad_create(struct evdev_device *device)
769 struct tp_dispatch *tp;
771 tp = zalloc(sizeof *tp);
775 if (tp_init(tp, device) != 0) {
776 tp_destroy(&tp->base);