summaryrefslogtreecommitdiff
path: root/src/evdev-mt-touchpad-buttons.c
blob: 82c99c762473bafd839180c15a5f34bed1b1e4ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
/*
 * Copyright © 2014-2015 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <errno.h>
#include <limits.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include "linux/input.h"

#include "evdev-mt-touchpad.h"

#define DEFAULT_BUTTON_ENTER_TIMEOUT ms2us(100)
#define DEFAULT_BUTTON_LEAVE_TIMEOUT ms2us(300)

/*****************************************
 * BEFORE YOU EDIT THIS FILE, look at the state diagram in
 * doc/touchpad-softbutton-state-machine.svg, or online at
 * https://drive.google.com/file/d/0B1NwWmji69nocUs1cVJTbkdwMFk/edit?usp=sharing
 * (it's a http://draw.io diagram)
 *
 * Any changes in this file must be represented in the diagram.
 *
 * The state machine only affects the soft button area code.
 */

static inline const char*
button_state_to_str(enum button_state state) {
	switch(state) {
	CASE_RETURN_STRING(BUTTON_STATE_NONE);
	CASE_RETURN_STRING(BUTTON_STATE_AREA);
	CASE_RETURN_STRING(BUTTON_STATE_BOTTOM);
	CASE_RETURN_STRING(BUTTON_STATE_TOP);
	CASE_RETURN_STRING(BUTTON_STATE_TOP_NEW);
	CASE_RETURN_STRING(BUTTON_STATE_TOP_TO_IGNORE);
	CASE_RETURN_STRING(BUTTON_STATE_IGNORE);
	}
	return NULL;
}

static inline const char*
button_event_to_str(enum button_event event) {
	switch(event) {
	CASE_RETURN_STRING(BUTTON_EVENT_IN_BOTTOM_R);
	CASE_RETURN_STRING(BUTTON_EVENT_IN_BOTTOM_L);
	CASE_RETURN_STRING(BUTTON_EVENT_IN_TOP_R);
	CASE_RETURN_STRING(BUTTON_EVENT_IN_TOP_M);
	CASE_RETURN_STRING(BUTTON_EVENT_IN_TOP_L);
	CASE_RETURN_STRING(BUTTON_EVENT_IN_AREA);
	CASE_RETURN_STRING(BUTTON_EVENT_UP);
	CASE_RETURN_STRING(BUTTON_EVENT_PRESS);
	CASE_RETURN_STRING(BUTTON_EVENT_RELEASE);
	CASE_RETURN_STRING(BUTTON_EVENT_TIMEOUT);
	}
	return NULL;
}

static inline bool
is_inside_bottom_button_area(const struct tp_dispatch *tp,
			     const struct tp_touch *t)
{
	return t->point.y >= tp->buttons.bottom_area.top_edge;
}

static inline bool
is_inside_bottom_right_area(const struct tp_dispatch *tp,
			    const struct tp_touch *t)
{
	return is_inside_bottom_button_area(tp, t) &&
	       t->point.x > tp->buttons.bottom_area.rightbutton_left_edge;
}

static inline bool
is_inside_bottom_left_area(const struct tp_dispatch *tp,
			   const struct tp_touch *t)
{
	return is_inside_bottom_button_area(tp, t) &&
	       !is_inside_bottom_right_area(tp, t);
}

static inline bool
is_inside_top_button_area(const struct tp_dispatch *tp,
			  const struct tp_touch *t)
{
	return t->point.y <= tp->buttons.top_area.bottom_edge;
}

static inline bool
is_inside_top_right_area(const struct tp_dispatch *tp,
			 const struct tp_touch *t)
{
	return is_inside_top_button_area(tp, t) &&
	       t->point.x > tp->buttons.top_area.rightbutton_left_edge;
}

static inline bool
is_inside_top_left_area(const struct tp_dispatch *tp,
			const struct tp_touch *t)
{
	return is_inside_top_button_area(tp, t) &&
	       t->point.x < tp->buttons.top_area.leftbutton_right_edge;
}

static inline bool
is_inside_top_middle_area(const struct tp_dispatch *tp,
			  const struct tp_touch *t)
{
	return is_inside_top_button_area(tp, t) &&
	       t->point.x >= tp->buttons.top_area.leftbutton_right_edge &&
	       t->point.x <= tp->buttons.top_area.rightbutton_left_edge;
}

static void
tp_button_set_enter_timer(struct tp_dispatch *tp, struct tp_touch *t)
{
	libinput_timer_set(&t->button.timer,
			   t->millis + DEFAULT_BUTTON_ENTER_TIMEOUT);
}

static void
tp_button_set_leave_timer(struct tp_dispatch *tp, struct tp_touch *t)
{
	libinput_timer_set(&t->button.timer,
			   t->millis + DEFAULT_BUTTON_LEAVE_TIMEOUT);
}

/*
 * tp_button_set_state, change state and implement on-entry behavior
 * as described in the state machine diagram.
 */
static void
tp_button_set_state(struct tp_dispatch *tp,
		    struct tp_touch *t,
		    enum button_state new_state,
		    enum button_event event)
{
	libinput_timer_cancel(&t->button.timer);

	t->button.state = new_state;

	switch (t->button.state) {
	case BUTTON_STATE_NONE:
		t->button.curr = 0;
		break;
	case BUTTON_STATE_AREA:
		t->button.curr = BUTTON_EVENT_IN_AREA;
		break;
	case BUTTON_STATE_BOTTOM:
		t->button.curr = event;
		break;
	case BUTTON_STATE_TOP:
		break;
	case BUTTON_STATE_TOP_NEW:
		t->button.curr = event;
		tp_button_set_enter_timer(tp, t);
		break;
	case BUTTON_STATE_TOP_TO_IGNORE:
		tp_button_set_leave_timer(tp, t);
		break;
	case BUTTON_STATE_IGNORE:
		t->button.curr = 0;
		break;
	}
}

static void
tp_button_none_handle_event(struct tp_dispatch *tp,
			    struct tp_touch *t,
			    enum button_event event)
{
	switch (event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
		tp_button_set_state(tp, t, BUTTON_STATE_BOTTOM, event);
		break;
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
		tp_button_set_state(tp, t, BUTTON_STATE_TOP_NEW, event);
		break;
	case BUTTON_EVENT_IN_AREA:
		tp_button_set_state(tp, t, BUTTON_STATE_AREA, event);
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
	case BUTTON_EVENT_TIMEOUT:
		break;
	}
}

static void
tp_button_area_handle_event(struct tp_dispatch *tp,
			    struct tp_touch *t,
			    enum button_event event)
{
	switch (event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
	case BUTTON_EVENT_IN_AREA:
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
	case BUTTON_EVENT_TIMEOUT:
		break;
	}
}

static void
tp_button_bottom_handle_event(struct tp_dispatch *tp,
			      struct tp_touch *t,
			      enum button_event event)
{
	switch (event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
		if (event != t->button.curr)
			tp_button_set_state(tp,
					    t,
					    BUTTON_STATE_BOTTOM,
					    event);
		break;
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
	case BUTTON_EVENT_IN_AREA:
		tp_button_set_state(tp, t, BUTTON_STATE_AREA, event);
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
	case BUTTON_EVENT_TIMEOUT:
		break;
	}
}

static void
tp_button_top_handle_event(struct tp_dispatch *tp,
			   struct tp_touch *t,
			   enum button_event event)
{
	switch (event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
		tp_button_set_state(tp, t, BUTTON_STATE_TOP_TO_IGNORE, event);
		break;
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
		if (event != t->button.curr)
			tp_button_set_state(tp,
					    t,
					    BUTTON_STATE_TOP_NEW,
					    event);
		break;
	case BUTTON_EVENT_IN_AREA:
		tp_button_set_state(tp, t, BUTTON_STATE_TOP_TO_IGNORE, event);
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
	case BUTTON_EVENT_TIMEOUT:
		break;
	}
}

static void
tp_button_top_new_handle_event(struct tp_dispatch *tp,
			       struct tp_touch *t,
			       enum button_event event)
{
	switch(event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
		tp_button_set_state(tp, t, BUTTON_STATE_AREA, event);
		break;
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
		if (event != t->button.curr)
			tp_button_set_state(tp,
					    t,
					    BUTTON_STATE_TOP_NEW,
					    event);
		break;
	case BUTTON_EVENT_IN_AREA:
		tp_button_set_state(tp, t, BUTTON_STATE_AREA, event);
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
		tp_button_set_state(tp, t, BUTTON_STATE_TOP, event);
		break;
	case BUTTON_EVENT_RELEASE:
		break;
	case BUTTON_EVENT_TIMEOUT:
		tp_button_set_state(tp, t, BUTTON_STATE_TOP, event);
		break;
	}
}

static void
tp_button_top_to_ignore_handle_event(struct tp_dispatch *tp,
				     struct tp_touch *t,
				     enum button_event event)
{
	switch(event) {
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
		if (event == t->button.curr)
			tp_button_set_state(tp,
					    t,
					    BUTTON_STATE_TOP,
					    event);
		else
			tp_button_set_state(tp,
					    t,
					    BUTTON_STATE_TOP_NEW,
					    event);
		break;
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
	case BUTTON_EVENT_IN_AREA:
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
		break;
	case BUTTON_EVENT_TIMEOUT:
		tp_button_set_state(tp, t, BUTTON_STATE_IGNORE, event);
		break;
	}
}

static void
tp_button_ignore_handle_event(struct tp_dispatch *tp,
			      struct tp_touch *t,
			      enum button_event event)
{
	switch (event) {
	case BUTTON_EVENT_IN_BOTTOM_R:
	case BUTTON_EVENT_IN_BOTTOM_L:
	case BUTTON_EVENT_IN_TOP_R:
	case BUTTON_EVENT_IN_TOP_M:
	case BUTTON_EVENT_IN_TOP_L:
	case BUTTON_EVENT_IN_AREA:
		break;
	case BUTTON_EVENT_UP:
		tp_button_set_state(tp, t, BUTTON_STATE_NONE, event);
		break;
	case BUTTON_EVENT_PRESS:
	case BUTTON_EVENT_RELEASE:
	case BUTTON_EVENT_TIMEOUT:
		break;
	}
}

static void
tp_button_handle_event(struct tp_dispatch *tp,
		       struct tp_touch *t,
		       enum button_event event,
		       uint64_t time)
{
	struct libinput *libinput = tp_libinput_context(tp);
	enum button_state current = t->button.state;

	switch(t->button.state) {
	case BUTTON_STATE_NONE:
		tp_button_none_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_AREA:
		tp_button_area_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_BOTTOM:
		tp_button_bottom_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_TOP:
		tp_button_top_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_TOP_NEW:
		tp_button_top_new_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_TOP_TO_IGNORE:
		tp_button_top_to_ignore_handle_event(tp, t, event);
		break;
	case BUTTON_STATE_IGNORE:
		tp_button_ignore_handle_event(tp, t, event);
		break;
	}

	if (current != t->button.state)
		log_debug(libinput,
			  "button state: from %s, event %s to %s\n",
			  button_state_to_str(current),
			  button_event_to_str(event),
			  button_state_to_str(t->button.state));
}

int
tp_button_handle_state(struct tp_dispatch *tp, uint64_t time)
{
	struct tp_touch *t;

	tp_for_each_touch(tp, t) {
		if (t->state == TOUCH_NONE)
			continue;

		if (t->state == TOUCH_END) {
			tp_button_handle_event(tp, t, BUTTON_EVENT_UP, time);
		} else if (t->dirty) {
			enum button_event event;

			if (is_inside_bottom_right_area(tp, t))
				event = BUTTON_EVENT_IN_BOTTOM_R;
			else if (is_inside_bottom_left_area(tp, t))
				event = BUTTON_EVENT_IN_BOTTOM_L;
			else if (is_inside_top_right_area(tp, t))
				event = BUTTON_EVENT_IN_TOP_R;
			else if (is_inside_top_middle_area(tp, t))
				event = BUTTON_EVENT_IN_TOP_M;
			else if (is_inside_top_left_area(tp, t))
				event = BUTTON_EVENT_IN_TOP_L;
			else
				event = BUTTON_EVENT_IN_AREA;

			tp_button_handle_event(tp, t, event, time);
		}
		if (tp->queued & TOUCHPAD_EVENT_BUTTON_RELEASE)
			tp_button_handle_event(tp, t, BUTTON_EVENT_RELEASE, time);
		if (tp->queued & TOUCHPAD_EVENT_BUTTON_PRESS)
			tp_button_handle_event(tp, t, BUTTON_EVENT_PRESS, time);
	}

	return 0;
}

static void
tp_button_handle_timeout(uint64_t now, void *data)
{
	struct tp_touch *t = data;

	tp_button_handle_event(t->tp, t, BUTTON_EVENT_TIMEOUT, now);
}

int
tp_process_button(struct tp_dispatch *tp,
		  const struct input_event *e,
		  uint64_t time)
{
	struct libinput *libinput = tp_libinput_context(tp);
	uint32_t mask = 1 << (e->code - BTN_LEFT);

	/* Ignore other buttons on clickpads */
	if (tp->buttons.is_clickpad && e->code != BTN_LEFT) {
		log_bug_kernel(libinput,
			       "received %s button event on a clickpad\n",
			       libevdev_event_code_get_name(EV_KEY, e->code));
		return 0;
	}

	if (e->value) {
		tp->buttons.state |= mask;
		tp->queued |= TOUCHPAD_EVENT_BUTTON_PRESS;
	} else {
		tp->buttons.state &= ~mask;
		tp->queued |= TOUCHPAD_EVENT_BUTTON_RELEASE;
	}

	return 0;
}

void
tp_release_all_buttons(struct tp_dispatch *tp,
		       uint64_t time)
{
	if (tp->buttons.state) {
		tp->buttons.state = 0;
		tp->queued |= TOUCHPAD_EVENT_BUTTON_RELEASE;
	}
}

static void
tp_init_softbuttons(struct tp_dispatch *tp,
		    struct evdev_device *device)
{
	int width, height;
	const struct input_absinfo *absinfo_x, *absinfo_y;
	int xoffset, yoffset;
	int yres;

	absinfo_x = device->abs.absinfo_x;
	absinfo_y = device->abs.absinfo_y;

	xoffset = absinfo_x->minimum,
	yoffset = absinfo_y->minimum,
	yres = absinfo_y->resolution;
	width = device->abs.dimensions.x;
	height = device->abs.dimensions.y;

	/* button height: 10mm or 15% or the touchpad height,
	   whichever is smaller */
	if ((height * 0.15)/yres > 10) {
		tp->buttons.bottom_area.top_edge =
			absinfo_y->maximum - 10 * yres;
	} else {
		tp->buttons.bottom_area.top_edge = height * .85 + yoffset;
	}
	tp->buttons.bottom_area.rightbutton_left_edge = width/2 + xoffset;
}

void
tp_init_top_softbuttons(struct tp_dispatch *tp,
			struct evdev_device *device,
			double topbutton_size_mult)
{
	int width;
	const struct input_absinfo *absinfo_x, *absinfo_y;
	int xoffset, yoffset;
	int yres;

	absinfo_x = device->abs.absinfo_x;
	absinfo_y = device->abs.absinfo_y;

	xoffset = absinfo_x->minimum,
	yoffset = absinfo_y->minimum;
	yres = absinfo_y->resolution;
	width = device->abs.dimensions.x;

	if (tp->buttons.has_topbuttons) {
		/* T440s has the top button line 5mm from the top, event
		   analysis has shown events to start down to ~10mm from the
		   top - which maps to 15%.  We allow the caller to enlarge the
		   area using a multiplier for the touchpad disabled case. */
		double topsize_mm = 10 * topbutton_size_mult;

		tp->buttons.top_area.bottom_edge = yoffset + topsize_mm * yres;
		tp->buttons.top_area.rightbutton_left_edge = width * .58 + xoffset;
		tp->buttons.top_area.leftbutton_right_edge = width * .42 + xoffset;
	} else {
		tp->buttons.top_area.bottom_edge = INT_MIN;
	}
}

static inline uint32_t
tp_button_config_click_get_methods(struct libinput_device *device)
{
	struct evdev_device *evdev = (struct evdev_device*)device;
	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;
	uint32_t methods = LIBINPUT_CONFIG_CLICK_METHOD_NONE;

	if (tp->buttons.is_clickpad) {
		methods |= LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS;
		if (tp->has_mt)
			methods |= LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER;
	}

	return methods;
}

static void
tp_switch_click_method(struct tp_dispatch *tp)
{
	/*
	 * All we need to do when switching click methods is to change the
	 * bottom_area.top_edge so that when in clickfinger mode the bottom
	 * touchpad area is not dead wrt finger movement starting there.
	 *
	 * We do not need to take any state into account, fingers which are
	 * already down will simply keep the state / area they have assigned
	 * until they are released, and the post_button_events path is state
	 * agnostic.
	 */

	switch (tp->buttons.click_method) {
	case LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS:
		tp_init_softbuttons(tp, tp->device);
		break;
	case LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER:
	case LIBINPUT_CONFIG_CLICK_METHOD_NONE:
		tp->buttons.bottom_area.top_edge = INT_MAX;
		break;
	}
}

static enum libinput_config_status
tp_button_config_click_set_method(struct libinput_device *device,
				  enum libinput_config_click_method method)
{
	struct evdev_device *evdev = (struct evdev_device*)device;
	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;

	tp->buttons.click_method = method;
	tp_switch_click_method(tp);

	return LIBINPUT_CONFIG_STATUS_SUCCESS;
}

static enum libinput_config_click_method
tp_button_config_click_get_method(struct libinput_device *device)
{
	struct evdev_device *evdev = (struct evdev_device*)device;
	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;

	return tp->buttons.click_method;
}

static enum libinput_config_click_method
tp_click_get_default_method(struct tp_dispatch *tp)
{
	struct evdev_device *device = tp->device;
	uint32_t clickfinger_models = EVDEV_MODEL_CHROMEBOOK |
				      EVDEV_MODEL_SYSTEM76_BONOBO |
				      EVDEV_MODEL_SYSTEM76_GALAGO |
				      EVDEV_MODEL_SYSTEM76_KUDU |
				      EVDEV_MODEL_CLEVO_W740SU;

	if (!tp->buttons.is_clickpad)
		return LIBINPUT_CONFIG_CLICK_METHOD_NONE;
	else if (libevdev_get_id_vendor(tp->device->evdev) == VENDOR_ID_APPLE)
		return LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER;

	if (device->model_flags & clickfinger_models)
		return LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER;

	return LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS;
}

static enum libinput_config_click_method
tp_button_config_click_get_default_method(struct libinput_device *device)
{
	struct evdev_device *evdev = (struct evdev_device*)device;
	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;

	return tp_click_get_default_method(tp);
}

static inline void
tp_init_middlebutton_emulation(struct tp_dispatch *tp,
			       struct evdev_device *device)
{
	bool enable_by_default,
	     want_config_option;

	if (tp->buttons.is_clickpad)
		return;

	/* init middle button emulation on non-clickpads, but only if we
	 * don't have a middle button. Exception: ALPS touchpads don't know
	 * if they have a middle button, so we always want the option there
	 * and enabled by default.
	 */
	if (!libevdev_has_event_code(device->evdev, EV_KEY, BTN_MIDDLE)) {
		enable_by_default = true;
		want_config_option = false;
	} else if (device->model_flags & EVDEV_MODEL_ALPS_TOUCHPAD) {
		enable_by_default = true;
		want_config_option = true;
	} else
		return;

	evdev_init_middlebutton(tp->device,
				enable_by_default,
				want_config_option);
}

int
tp_init_buttons(struct tp_dispatch *tp,
		struct evdev_device *device)
{
	struct libinput *libinput = tp_libinput_context(tp);
	struct tp_touch *t;
	const struct input_absinfo *absinfo_x, *absinfo_y;

	tp->buttons.is_clickpad = libevdev_has_property(device->evdev,
							INPUT_PROP_BUTTONPAD);
	tp->buttons.has_topbuttons = libevdev_has_property(device->evdev,
						        INPUT_PROP_TOPBUTTONPAD);

	if (libevdev_has_event_code(device->evdev, EV_KEY, BTN_MIDDLE) ||
	    libevdev_has_event_code(device->evdev, EV_KEY, BTN_RIGHT)) {
		if (tp->buttons.is_clickpad)
			log_bug_kernel(libinput,
				       "%s: clickpad advertising right button\n",
				       device->devname);
	} else if (libevdev_has_event_code(device->evdev, EV_KEY, BTN_LEFT) &&
		   !tp->buttons.is_clickpad &&
		   libevdev_get_id_vendor(device->evdev) != VENDOR_ID_APPLE) {
			log_bug_kernel(libinput,
				       "%s: non clickpad without right button?\n",
				       device->devname);
	}

	absinfo_x = device->abs.absinfo_x;
	absinfo_y = device->abs.absinfo_y;

	/* pinned-finger motion threshold, see tp_unpin_finger. */
	tp->buttons.motion_dist.x_scale_coeff = 1.0/absinfo_x->resolution;
	tp->buttons.motion_dist.y_scale_coeff = 1.0/absinfo_y->resolution;

	tp->buttons.config_method.get_methods = tp_button_config_click_get_methods;
	tp->buttons.config_method.set_method = tp_button_config_click_set_method;
	tp->buttons.config_method.get_method = tp_button_config_click_get_method;
	tp->buttons.config_method.get_default_method = tp_button_config_click_get_default_method;
	tp->device->base.config.click_method = &tp->buttons.config_method;

	tp->buttons.click_method = tp_click_get_default_method(tp);
	tp_switch_click_method(tp);

	tp_init_top_softbuttons(tp, device, 1.0);

	tp_init_middlebutton_emulation(tp, device);

	tp_for_each_touch(tp, t) {
		t->button.state = BUTTON_STATE_NONE;
		libinput_timer_init(&t->button.timer,
				    tp_libinput_context(tp),
				    tp_button_handle_timeout, t);
	}

	return 0;
}

void
tp_remove_buttons(struct tp_dispatch *tp)
{
	struct tp_touch *t;

	tp_for_each_touch(tp, t)
		libinput_timer_cancel(&t->button.timer);
}

static int
tp_post_physical_buttons(struct tp_dispatch *tp, uint64_t time)
{
	uint32_t current, old, button;

	current = tp->buttons.state;
	old = tp->buttons.old_state;
	button = BTN_LEFT;

	while (current || old) {
		enum libinput_button_state state;

		if ((current & 0x1) ^ (old & 0x1)) {
			uint32_t b;

			if (!!(current & 0x1))
				state = LIBINPUT_BUTTON_STATE_PRESSED;
			else
				state = LIBINPUT_BUTTON_STATE_RELEASED;

			b = evdev_to_left_handed(tp->device, button);
			evdev_pointer_notify_physical_button(tp->device,
							     time,
							     b,
							     state);
		}

		button++;
		current >>= 1;
		old >>= 1;
	}

	return 0;
}

static inline int
tp_check_clickfinger_distance(struct tp_dispatch *tp,
			      struct tp_touch *t1,
			      struct tp_touch *t2)
{
	double x, y;
	int within_distance = 0;
	int xres, yres;
	int bottom_threshold;

	if (!t1 || !t2)
		return 0;

	if (t1->thumb.state == THUMB_STATE_YES ||
	    t2->thumb.state == THUMB_STATE_YES)
		return 0;

	x = abs(t1->point.x - t2->point.x);
	y = abs(t1->point.y - t2->point.y);

	xres = tp->device->abs.absinfo_x->resolution;
	yres = tp->device->abs.absinfo_y->resolution;
	x /= xres;
	y /= yres;

	/* maximum horiz spread is 40mm horiz, 30mm vert, anything wider
	 * than that is probably a gesture. */
	if (x > 40 || y > 30)
		goto out;

	within_distance = 1;

	/* if y spread is <= 20mm, they're definitely together. */
	if (y <= 20)
		goto out;

	/* if they're vertically spread between 20-40mm, they're not
	 * together if:
	 * - the touchpad's vertical size is >50mm, anything smaller is
	 *   unlikely to have a thumb resting on it
	 * - and one of the touches is in the bottom 20mm of the touchpad
	 *   and the other one isn't
	 */

	if (tp->device->abs.dimensions.y/yres < 50)
		goto out;

	bottom_threshold = tp->device->abs.absinfo_y->maximum - 20 * yres;
	if ((t1->point.y > bottom_threshold) !=
		    (t2->point.y > bottom_threshold))
		within_distance = 0;

out:
	return within_distance;
}

static uint32_t
tp_clickfinger_set_button(struct tp_dispatch *tp)
{
	uint32_t button;
	unsigned int nfingers = tp->nfingers_down;
	struct tp_touch *t;
	struct tp_touch *first = NULL,
			*second = NULL;

	if (nfingers != 2)
		goto out;

	/* two fingers down on the touchpad. Check for distance
	 * between the fingers. */
	tp_for_each_touch(tp, t) {
		if (t->state != TOUCH_BEGIN && t->state != TOUCH_UPDATE)
			continue;

		if (t->thumb.state == THUMB_STATE_YES)
			continue;

		if (!first)
			first = t;
		else if (!second)
			second = t;
	}

	if (!first || !second) {
		nfingers = 1;
		goto out;
	}

	if (tp_check_clickfinger_distance(tp, first, second))
		nfingers = 2;
	else
		nfingers = 1;

out:
	switch (nfingers) {
	case 0:
	case 1: button = BTN_LEFT; break;
	case 2: button = BTN_RIGHT; break;
	default:
		button = BTN_MIDDLE; break;
		break;
	}

	return button;
}

static int
tp_notify_clickpadbutton(struct tp_dispatch *tp,
			 uint64_t time,
			 uint32_t button,
			 uint32_t is_topbutton,
			 enum libinput_button_state state)
{
	/* If we've a trackpoint, send top buttons through the trackpoint */
	if (is_topbutton && tp->buttons.trackpoint) {
		struct evdev_dispatch *dispatch = tp->buttons.trackpoint->dispatch;
		struct input_event event;

		event.time.tv_sec = time / ms2us(1000);
		event.time.tv_usec = time % ms2us(1000);
		event.type = EV_KEY;
		event.code = button;
		event.value = (state == LIBINPUT_BUTTON_STATE_PRESSED) ? 1 : 0;
		dispatch->interface->process(dispatch,
					     tp->buttons.trackpoint,
					     &event,
					     time);
		return 1;
	}

	/* Ignore button events not for the trackpoint while suspended */
	if (tp->device->suspended)
		return 0;

	/* A button click always terminates edge scrolling, even if we
	 * don't end up sending a button event. */
	tp_edge_scroll_stop_events(tp, time);

	/*
	 * If the user has requested clickfinger replace the button chosen
	 * by the softbutton code with one based on the number of fingers.
	 */
	if (tp->buttons.click_method == LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER &&
	    state == LIBINPUT_BUTTON_STATE_PRESSED) {
		button = tp_clickfinger_set_button(tp);
		tp->buttons.active = button;

		if (!button)
			return 0;
	}

	evdev_pointer_notify_button(tp->device, time, button, state);
	return 1;
}

static int
tp_post_clickpadbutton_buttons(struct tp_dispatch *tp, uint64_t time)
{
	uint32_t current, old, button, is_top;
	enum libinput_button_state state;
	enum { AREA = 0x01, LEFT = 0x02, MIDDLE = 0x04, RIGHT = 0x08 };

	current = tp->buttons.state;
	old = tp->buttons.old_state;
	is_top = 0;

	if (!tp->buttons.click_pending && current == old)
		return 0;

	if (current) {
		struct tp_touch *t;
		uint32_t area = 0;

		tp_for_each_touch(tp, t) {
			switch (t->button.curr) {
			case BUTTON_EVENT_IN_AREA:
				area |= AREA;
				break;
			case BUTTON_EVENT_IN_TOP_L:
				is_top = 1;
				/* fallthrough */
			case BUTTON_EVENT_IN_BOTTOM_L:
				area |= LEFT;
				break;
			case BUTTON_EVENT_IN_TOP_M:
				is_top = 1;
				area |= MIDDLE;
				break;
			case BUTTON_EVENT_IN_TOP_R:
				is_top = 1;
				/* fallthrough */
			case BUTTON_EVENT_IN_BOTTOM_R:
				area |= RIGHT;
				break;
			default:
				break;
			}
		}

		if (area == 0 &&
		    tp->buttons.click_method != LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER) {
			/* No touches, wait for a touch before processing */
			tp->buttons.click_pending = true;
			return 0;
		}

		if ((area & MIDDLE) || ((area & LEFT) && (area & RIGHT)))
			button = evdev_to_left_handed(tp->device, BTN_MIDDLE);
		else if (area & RIGHT)
			button = evdev_to_left_handed(tp->device, BTN_RIGHT);
		else if (area & LEFT)
			button = evdev_to_left_handed(tp->device, BTN_LEFT);
		else /* main or no area (for clickfinger) is always BTN_LEFT */
			button = BTN_LEFT;

		tp->buttons.active = button;
		tp->buttons.active_is_topbutton = is_top;
		state = LIBINPUT_BUTTON_STATE_PRESSED;
	} else {
		button = tp->buttons.active;
		is_top = tp->buttons.active_is_topbutton;
		tp->buttons.active = 0;
		tp->buttons.active_is_topbutton = 0;
		state = LIBINPUT_BUTTON_STATE_RELEASED;
	}

	tp->buttons.click_pending = false;

	if (button)
		return tp_notify_clickpadbutton(tp,
						time,
						button,
						is_top,
						state);
	return 0;
}

int
tp_post_button_events(struct tp_dispatch *tp, uint64_t time)
{
	if (tp->buttons.is_clickpad)
		return tp_post_clickpadbutton_buttons(tp, time);
	else
		return tp_post_physical_buttons(tp, time);
}

int
tp_button_touch_active(const struct tp_dispatch *tp,
		       const struct tp_touch *t)
{
	return t->button.state == BUTTON_STATE_AREA;
}

bool
tp_button_is_inside_softbutton_area(const struct tp_dispatch *tp,
				    const struct tp_touch *t)
{
	return is_inside_top_button_area(tp, t) ||
	       is_inside_bottom_button_area(tp, t);
}