summaryrefslogtreecommitdiff
path: root/src/evdev-mt-touchpad.h
blob: 174fed6ad1ff44bcec8f5962598ebd6c711e17be (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
/*
 * 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.
 */

#ifndef EVDEV_MT_TOUCHPAD_H
#define EVDEV_MT_TOUCHPAD_H

#include <stdbool.h>

#include "evdev.h"
#include "filter.h"
#include "timer.h"

#define TOUCHPAD_HISTORY_LENGTH 4
#define TOUCHPAD_MIN_SAMPLES 4

/* Convert mm to a distance normalized to DEFAULT_MOUSE_DPI */
#define TP_MM_TO_DPI_NORMALIZED(mm) (DEFAULT_MOUSE_DPI/25.4 * mm)

enum touchpad_event {
	TOUCHPAD_EVENT_NONE		= 0,
	TOUCHPAD_EVENT_MOTION		= (1 << 0),
	TOUCHPAD_EVENT_BUTTON_PRESS	= (1 << 1),
	TOUCHPAD_EVENT_BUTTON_RELEASE	= (1 << 2),
};

enum touchpad_model {
	MODEL_UNKNOWN = 0,
	MODEL_SYNAPTICS,
	MODEL_ALPS,
	MODEL_APPLETOUCH,
	MODEL_ELANTECH,
	MODEL_UNIBODY_MACBOOK
};

enum touch_state {
	TOUCH_NONE = 0,
	TOUCH_HOVERING,
	TOUCH_BEGIN,
	TOUCH_UPDATE,
	TOUCH_END
};

enum touch_palm_state {
	PALM_NONE = 0,
	PALM_EDGE,
	PALM_TYPING,
	PALM_TRACKPOINT,
};

enum button_event {
	BUTTON_EVENT_IN_BOTTOM_R = 30,
	BUTTON_EVENT_IN_BOTTOM_L,
	BUTTON_EVENT_IN_TOP_R,
	BUTTON_EVENT_IN_TOP_M,
	BUTTON_EVENT_IN_TOP_L,
	BUTTON_EVENT_IN_AREA,
	BUTTON_EVENT_UP,
	BUTTON_EVENT_PRESS,
	BUTTON_EVENT_RELEASE,
	BUTTON_EVENT_TIMEOUT,
};

enum button_state {
	BUTTON_STATE_NONE,
	BUTTON_STATE_AREA,
	BUTTON_STATE_BOTTOM,
	BUTTON_STATE_TOP,
	BUTTON_STATE_TOP_NEW,
	BUTTON_STATE_TOP_TO_IGNORE,
	BUTTON_STATE_IGNORE,
};

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_2_RELEASE,
	TAP_STATE_TOUCH_3,
	TAP_STATE_TOUCH_3_HOLD,
	TAP_STATE_DRAGGING_OR_DOUBLETAP,
	TAP_STATE_DRAGGING_OR_TAP,
	TAP_STATE_DRAGGING,
	TAP_STATE_DRAGGING_WAIT,
	TAP_STATE_DRAGGING_2,
	TAP_STATE_MULTITAP,
	TAP_STATE_MULTITAP_DOWN,
	TAP_STATE_DEAD, /**< finger count exceeded */
};

enum tp_tap_touch_state {
	TAP_TOUCH_STATE_IDLE = 16,	/**< not in touch */
	TAP_TOUCH_STATE_TOUCH,		/**< touching, may tap */
	TAP_TOUCH_STATE_DEAD,		/**< exceeded motion/timeout */
};

/* For edge scrolling, so we only care about right and bottom */
enum tp_edge {
	EDGE_NONE = 0,
	EDGE_RIGHT = (1 << 0),
	EDGE_BOTTOM = (1 << 1),
};

enum tp_edge_scroll_touch_state {
	EDGE_SCROLL_TOUCH_STATE_NONE,
	EDGE_SCROLL_TOUCH_STATE_EDGE_NEW,
	EDGE_SCROLL_TOUCH_STATE_EDGE,
	EDGE_SCROLL_TOUCH_STATE_AREA,
};

enum tp_gesture_state {
	GESTURE_STATE_NONE,
	GESTURE_STATE_UNKNOWN,
	GESTURE_STATE_SCROLL,
	GESTURE_STATE_PINCH,
	GESTURE_STATE_SWIPE,
};

enum tp_thumb_state {
	THUMB_STATE_NO,
	THUMB_STATE_YES,
	THUMB_STATE_MAYBE,
};

struct tp_touch {
	struct tp_dispatch *tp;
	enum touch_state state;
	bool has_ended;				/* TRACKING_ID == -1 */
	bool dirty;
	struct device_coords point;
	uint64_t millis;
	int distance;				/* distance == 0 means touch */
	int pressure;

	struct {
		/* A quirk mostly used on Synaptics touchpads. In a
		   transition to/from fake touches > num_slots, the current
		   event data is likely garbage and the subsequent event
		   is likely too. This marker tells us to reset the motion
		   history again -> this effectively swallows any motion */
		bool reset_motion_history;
	} quirks;

	struct {
		struct device_coords samples[TOUCHPAD_HISTORY_LENGTH];
		unsigned int index;
		unsigned int count;
	} history;

	struct device_coords hysteresis_center;

	/* A pinned touchpoint is the one that pressed the physical button
	 * on a clickpad. After the release, it won't move until the center
	 * moves more than a threshold away from the original coordinates
	 */
	struct {
		bool is_pinned;
		struct device_coords center;
	} pinned;

	/* Software-button state and timeout if applicable */
	struct {
		enum button_state state;
		/* We use button_event here so we can use == on events */
		enum button_event curr;
		struct libinput_timer timer;
	} button;

	struct {
		enum tp_tap_touch_state state;
		struct device_coords initial;
		bool is_thumb;
	} tap;

	struct {
		enum tp_edge_scroll_touch_state edge_state;
		uint32_t edge;
		int direction;
		struct libinput_timer timer;
		struct device_coords initial;
	} scroll;

	struct {
		enum touch_palm_state state;
		struct device_coords first; /* first coordinates if is_palm == true */
		uint64_t time; /* first timestamp if is_palm == true */
	} palm;

	struct {
		struct device_coords initial;
	} gesture;

	struct {
		enum tp_thumb_state state;
		uint64_t first_touch_time;
		struct device_coords initial;
	} thumb;
};

struct tp_dispatch {
	struct evdev_dispatch base;
	struct evdev_device *device;
	unsigned int nfingers_down;		/* number of fingers down */
	unsigned int old_nfingers_down;		/* previous no fingers down */
	unsigned int slot;			/* current slot */
	bool has_mt;
	bool semi_mt;
	bool reports_distance;			/* does the device support true hovering */

	unsigned int num_slots;			/* number of slots */
	unsigned int ntouches;			/* no slots inc. fakes */
	struct tp_touch *touches;		/* len == ntouches */
	/* bit 0: BTN_TOUCH
	 * bit 1: BTN_TOOL_FINGER
	 * bit 2: BTN_TOOL_DOUBLETAP
	 * ...
	 */
	unsigned int fake_touches;

	struct device_coords hysteresis_margin;

	struct {
		double x_scale_coeff;
		double y_scale_coeff;
	} accel;

	struct {
		bool enabled;
		bool started;
		unsigned int finger_count;
		unsigned int finger_count_pending;
		struct libinput_timer finger_count_switch_timer;
		enum tp_gesture_state state;
		struct tp_touch *touches[2];
		uint64_t initial_time;
		double initial_distance;
		double prev_scale;
		double angle;
		struct device_float_coords center;
	} gesture;

	struct {
		bool is_clickpad;		/* true for clickpads */
		bool has_topbuttons;
		bool use_clickfinger;		/* number of fingers decides button number */
		bool click_pending;
		uint32_t state;
		uint32_t old_state;
		struct {
			double x_scale_coeff;
			double y_scale_coeff;
		} motion_dist;			/* for pinned touches */
		unsigned int active;		/* currently active button, for release event */
		bool active_is_topbutton;	/* is active a top button? */

		/* Only used for clickpads. The software button areas are
		 * always 2 horizontal stripes across the touchpad.
		 * The buttons are split according to the edge settings.
		 */
		struct {
			int32_t top_edge;	/* in device coordinates */
			int32_t rightbutton_left_edge; /* in device coordinates */
		} bottom_area;

		struct {
			int32_t bottom_edge;	/* in device coordinates */
			int32_t rightbutton_left_edge; /* in device coordinates */
			int32_t leftbutton_right_edge; /* in device coordinates */
		} top_area;

		struct evdev_device *trackpoint;

		enum libinput_config_click_method click_method;
		struct libinput_device_config_click_method config_method;
	} buttons;

	struct {
		struct libinput_device_config_scroll_method config_method;
		enum libinput_config_scroll_method method;
		int32_t right_edge;		/* in device coordinates */
		int32_t bottom_edge;		/* in device coordinates */
	} scroll;

	enum touchpad_event queued;

	struct {
		struct libinput_device_config_tap config;
		bool enabled;
		bool suspended;
		struct libinput_timer timer;
		enum tp_tap_state state;
		uint32_t buttons_pressed;
		uint64_t multitap_last_time;

		bool drag_lock_enabled;
	} tap;

	struct {
		int32_t right_edge;		/* in device coordinates */
		int32_t left_edge;		/* in device coordinates */
		int32_t vert_center;		/* in device coordinates */

		bool trackpoint_active;
		struct libinput_event_listener trackpoint_listener;
		struct libinput_timer trackpoint_timer;
		uint64_t trackpoint_last_event_time;
		bool monitor_trackpoint;
	} palm;

	struct {
		struct libinput_device_config_send_events config;
		enum libinput_config_send_events_mode current_mode;
	} sendevents;

	struct {
		struct libinput_device_config_dwt config;
		bool dwt_enabled;

		bool keyboard_active;
		struct libinput_event_listener keyboard_listener;
		struct libinput_timer keyboard_timer;
		struct evdev_device *keyboard;

		uint64_t keyboard_last_press_time;
	} dwt;

	struct {
		bool detect_thumbs;
		int threshold;
		int upper_thumb_line;
		int lower_thumb_line;
	} thumb;
};

#define tp_for_each_touch(_tp, _t) \
	for (unsigned int _i = 0; _i < (_tp)->ntouches && (_t = &(_tp)->touches[_i]); _i++)

static inline struct libinput*
tp_libinput_context(const struct tp_dispatch *tp)
{
	return tp->device->base.seat->libinput;
}

static inline struct normalized_coords
tp_normalize_delta(struct tp_dispatch *tp, struct device_float_coords delta)
{
	struct normalized_coords normalized;

	normalized.x = delta.x * tp->accel.x_scale_coeff;
	normalized.y = delta.y * tp->accel.y_scale_coeff;

	return normalized;
}

/**
 * Takes a dpi-normalized set of coordinates, returns a set of coordinates
 * in the x-axis' coordinate space.
 */
static inline struct device_float_coords
tp_unnormalize_for_xaxis(struct tp_dispatch *tp, struct normalized_coords delta)
{
	struct device_float_coords raw;

	raw.x = delta.x / tp->accel.x_scale_coeff;
	raw.y = delta.y / tp->accel.x_scale_coeff; /* <--- not a typo */

	return raw;
}

struct normalized_coords
tp_get_delta(struct tp_touch *t);

struct normalized_coords
tp_filter_motion(struct tp_dispatch *tp,
		 const struct normalized_coords *unaccelerated,
		 uint64_t time);

struct normalized_coords
tp_filter_motion_unaccelerated(struct tp_dispatch *tp,
			       const struct normalized_coords *unaccelerated,
			       uint64_t time);

int
tp_touch_active(const struct tp_dispatch *tp, const struct tp_touch *t);

int
tp_tap_handle_state(struct tp_dispatch *tp, uint64_t time);

int
tp_init_tap(struct tp_dispatch *tp);

void
tp_remove_tap(struct tp_dispatch *tp);

int
tp_init_buttons(struct tp_dispatch *tp, struct evdev_device *device);

void
tp_init_top_softbuttons(struct tp_dispatch *tp,
			struct evdev_device *device,
			double topbutton_size_mult);

void
tp_remove_buttons(struct tp_dispatch *tp);

int
tp_process_button(struct tp_dispatch *tp,
		  const struct input_event *e,
		  uint64_t time);

void
tp_release_all_buttons(struct tp_dispatch *tp,
		       uint64_t time);

int
tp_post_button_events(struct tp_dispatch *tp, uint64_t time);

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

int
tp_button_touch_active(const struct tp_dispatch *tp,
		       const struct tp_touch *t);

bool
tp_button_is_inside_softbutton_area(const struct tp_dispatch *tp,
				    const struct tp_touch *t);

void
tp_release_all_taps(struct tp_dispatch *tp,
		    uint64_t time);

void
tp_tap_suspend(struct tp_dispatch *tp, uint64_t time);

void
tp_tap_resume(struct tp_dispatch *tp, uint64_t time);

bool
tp_tap_dragging(const struct tp_dispatch *tp);

int
tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device);

void
tp_remove_edge_scroll(struct tp_dispatch *tp);

void
tp_edge_scroll_handle_state(struct tp_dispatch *tp, uint64_t time);

int
tp_edge_scroll_post_events(struct tp_dispatch *tp, uint64_t time);

void
tp_edge_scroll_stop_events(struct tp_dispatch *tp, uint64_t time);

int
tp_edge_scroll_touch_active(const struct tp_dispatch *tp,
			    const struct tp_touch *t);

uint32_t
tp_touch_get_edge(const struct tp_dispatch *tp, const struct tp_touch *t);

int
tp_init_gesture(struct tp_dispatch *tp);

void
tp_remove_gesture(struct tp_dispatch *tp);

void
tp_gesture_stop(struct tp_dispatch *tp, uint64_t time);

void
tp_gesture_cancel(struct tp_dispatch *tp, uint64_t time);

void
tp_gesture_handle_state(struct tp_dispatch *tp, uint64_t time);

void
tp_gesture_post_events(struct tp_dispatch *tp, uint64_t time);

void
tp_gesture_stop_twofinger_scroll(struct tp_dispatch *tp, uint64_t time);

bool
tp_palm_tap_is_palm(const struct tp_dispatch *tp, const struct tp_touch *t);

#endif