src/evdev-mt-touchpad.h

   1 /*
   2  * Copyright © 2014 Red Hat, Inc.
   3  *
   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.
  13  *
  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.
  21  */
  22
  23
  24 #ifndef EVDEV_MT_TOUCHPAD_H
  25 #define EVDEV_MT_TOUCHPAD_H
  26
  27 #include <stdbool.h>
  28
  29 #include "evdev.h"
  30 #include "filter.h"
  31 #include "timer.h"
  32
  33 #define TOUCHPAD_HISTORY_LENGTH 4
  34 #define TOUCHPAD_MIN_SAMPLES 4
  35
  36 enum touchpad_event {
  37         TOUCHPAD_EVENT_NONE             = 0,
  38         TOUCHPAD_EVENT_MOTION           = (1 << 0),
  39         TOUCHPAD_EVENT_BUTTON_PRESS     = (1 << 1),
  40         TOUCHPAD_EVENT_BUTTON_RELEASE   = (1 << 2),
  41 };
  42
  43 enum touch_state {
  44         TOUCH_NONE = 0,
  45         TOUCH_BEGIN,
  46         TOUCH_UPDATE,
  47         TOUCH_END
  48 };
  49
  50 enum button_event {
  51         BUTTON_EVENT_IN_BOTTOM_R = 30,
  52         BUTTON_EVENT_IN_BOTTOM_L,
  53         BUTTON_EVENT_IN_TOP_R,
  54         BUTTON_EVENT_IN_TOP_M,
  55         BUTTON_EVENT_IN_TOP_L,
  56         BUTTON_EVENT_IN_AREA,
  57         BUTTON_EVENT_UP,
  58         BUTTON_EVENT_PRESS,
  59         BUTTON_EVENT_RELEASE,
  60         BUTTON_EVENT_TIMEOUT,
  61 };
  62
  63 enum button_state {
  64         BUTTON_STATE_NONE,
  65         BUTTON_STATE_AREA,
  66         BUTTON_STATE_BOTTOM,
  67         BUTTON_STATE_BOTTOM_NEW,
  68         BUTTON_STATE_BOTTOM_TO_AREA,
  69         BUTTON_STATE_TOP,
  70         BUTTON_STATE_TOP_NEW,
  71         BUTTON_STATE_TOP_TO_IGNORE,
  72         BUTTON_STATE_IGNORE,
  73 };
  74
  75 enum scroll_state {
  76         SCROLL_STATE_NONE,
  77         SCROLL_STATE_SCROLLING
  78 };
  79
  80 enum tp_tap_state {
  81         TAP_STATE_IDLE = 4,
  82         TAP_STATE_TOUCH,
  83         TAP_STATE_HOLD,
  84         TAP_STATE_TAPPED,
  85         TAP_STATE_TOUCH_2,
  86         TAP_STATE_TOUCH_2_HOLD,
  87         TAP_STATE_TOUCH_3,
  88         TAP_STATE_TOUCH_3_HOLD,
  89         TAP_STATE_DRAGGING_OR_DOUBLETAP,
  90         TAP_STATE_DRAGGING,
  91         TAP_STATE_DRAGGING_WAIT,
  92         TAP_STATE_DRAGGING_2,
  93         TAP_STATE_DEAD, /**< finger count exceeded */
  94 };
  95
  96 struct tp_motion {
  97         int32_t x;
  98         int32_t y;
  99 };
 100
 101 struct tp_touch {
 102         struct tp_dispatch *tp;
 103         enum touch_state state;
 104         bool dirty;
 105         bool fake;                              /* a fake touch */
 106         bool is_pointer;                        /* the pointer-controlling touch */
 107         int32_t x;
 108         int32_t y;
 109         uint64_t millis;
 110
 111         struct {
 112                 struct tp_motion samples[TOUCHPAD_HISTORY_LENGTH];
 113                 unsigned int index;
 114                 unsigned int count;
 115         } history;
 116
 117         struct {
 118                 int32_t center_x;
 119                 int32_t center_y;
 120         } hysteresis;
 121
 122         /* A pinned touchpoint is the one that pressed the physical button
 123          * on a clickpad. After the release, it won't move until the center
 124          * moves more than a threshold away from the original coordinates
 125          */
 126         struct {
 127                 bool is_pinned;
 128                 int32_t center_x;
 129                 int32_t center_y;
 130         } pinned;
 131
 132         /* Software-button state and timeout if applicable */
 133         struct {
 134                 enum button_state state;
 135                 /* We use button_event here so we can use == on events */
 136                 enum button_event curr;
 137                 struct libinput_timer timer;
 138         } button;
 139 };
 140
 141 struct tp_dispatch {
 142         struct evdev_dispatch base;
 143         struct evdev_device *device;
 144         unsigned int nfingers_down;             /* number of fingers down */
 145         unsigned int slot;                      /* current slot */
 146         bool has_mt;
 147
 148         unsigned int ntouches;                  /* number of slots */
 149         struct tp_touch *touches;               /* len == ntouches */
 150         unsigned int fake_touches;              /* fake touch mask */
 151
 152         struct {
 153                 int32_t margin_x;
 154                 int32_t margin_y;
 155         } hysteresis;
 156
 157         struct motion_filter *filter;
 158
 159         struct {
 160                 double constant_factor;
 161                 double min_factor;
 162                 double max_factor;
 163
 164                 double x_scale_coeff;
 165                 double y_scale_coeff;
 166         } accel;
 167
 168         struct {
 169                 bool is_clickpad;               /* true for clickpads */
 170                 bool has_topbuttons;
 171                 bool use_clickfinger;           /* number of fingers decides button number */
 172                 bool click_pending;
 173                 uint32_t state;
 174                 uint32_t old_state;
 175                 uint32_t motion_dist;           /* for pinned touches */
 176                 unsigned int active;            /* currently active button, for release event */
 177
 178                 /* Only used for clickpads. The software button areas are
 179                  * always 2 horizontal stripes across the touchpad.
 180                  * The buttons are split according to the edge settings.
 181                  */
 182                 struct {
 183                         int32_t top_edge;
 184                         int32_t rightbutton_left_edge;
 185                 } bottom_area;
 186
 187                 struct {
 188                         int32_t bottom_edge;
 189                         int32_t rightbutton_left_edge;
 190                         int32_t leftbutton_right_edge;
 191                 } top_area;
 192         } buttons;                              /* physical buttons */
 193
 194         struct {
 195                 enum scroll_state state;
 196                 enum libinput_pointer_axis direction;
 197         } scroll;
 198
 199         enum touchpad_event queued;
 200
 201         struct {
 202                 bool enabled;
 203                 struct libinput_timer timer;
 204                 enum tp_tap_state state;
 205         } tap;
 206 };
 207
 208 #define tp_for_each_touch(_tp, _t) \
 209         for (unsigned int _i = 0; _i < (_tp)->ntouches && (_t = &(_tp)->touches[_i]); _i++)
 210
 211 void
 212 tp_get_delta(struct tp_touch *t, double *dx, double *dy);
 213
 214 void
 215 tp_set_pointer(struct tp_dispatch *tp, struct tp_touch *t);
 216
 217 int
 218 tp_tap_handle_state(struct tp_dispatch *tp, uint64_t time);
 219
 220 int
 221 tp_init_tap(struct tp_dispatch *tp);
 222
 223 void
 224 tp_destroy_tap(struct tp_dispatch *tp);
 225
 226 int
 227 tp_init_buttons(struct tp_dispatch *tp, struct evdev_device *device);
 228
 229 void
 230 tp_destroy_buttons(struct tp_dispatch *tp);
 231
 232 int
 233 tp_process_button(struct tp_dispatch *tp,
 234                   const struct input_event *e,
 235                   uint64_t time);
 236
 237 int
 238 tp_post_button_events(struct tp_dispatch *tp, uint64_t time);
 239
 240 int
 241 tp_button_handle_state(struct tp_dispatch *tp, uint64_t time);
 242
 243 int
 244 tp_button_touch_active(struct tp_dispatch *tp, struct tp_touch *t);
 245
 246 #endif