Author: philip
Date: Sun Jun 16 03:06:05 2019
New Revision: 349098
URL: https://svnweb.freebsd.org/changeset/base/349098

Log:
  Add macOS-like three finger drag trackpad gesture to psm(4)
  
  Submitted by: Yan Ka Chiu <n...@myuji.xyz>
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D20648

Modified:
  head/sys/dev/atkbdc/psm.c

Modified: head/sys/dev/atkbdc/psm.c
==============================================================================
--- head/sys/dev/atkbdc/psm.c   Sun Jun 16 01:23:45 2019        (r349097)
+++ head/sys/dev/atkbdc/psm.c   Sun Jun 16 03:06:05 2019        (r349098)
@@ -236,6 +236,7 @@ typedef struct synapticsinfo {
        int                      softbutton3_x;
        int                      max_x;
        int                      max_y;
+       int                      three_finger_drag;
        int                      natural_scroll;
 } synapticsinfo_t;
 
@@ -572,6 +573,7 @@ enum {
        SYNAPTICS_SYSCTL_SOFTBUTTONS_Y =        SYN_OFFSET(softbuttons_y),
        SYNAPTICS_SYSCTL_SOFTBUTTON2_X =        SYN_OFFSET(softbutton2_x),
        SYNAPTICS_SYSCTL_SOFTBUTTON3_X =        SYN_OFFSET(softbutton3_x),
+       SYNAPTICS_SYSCTL_THREE_FINGER_DRAG =    SYN_OFFSET(three_finger_drag),
        SYNAPTICS_SYSCTL_NATURAL_SCROLL =       SYN_OFFSET(natural_scroll),
 #define        SYNAPTICS_SYSCTL_LAST   SYNAPTICS_SYSCTL_NATURAL_SCROLL
 };
@@ -3785,6 +3787,7 @@ psmgestures(struct psm_softc *sc, finger_t *fingers, i
                int vscroll_hor_area, vscroll_ver_area;
                int two_finger_scroll;
                int max_x, max_y;
+               int three_finger_drag;
 
                /* Read sysctl. */
                /* XXX Verify values? */
@@ -3799,7 +3802,7 @@ psmgestures(struct psm_softc *sc, finger_t *fingers, i
                two_finger_scroll = sc->syninfo.two_finger_scroll;
                max_x = sc->syninfo.max_x;
                max_y = sc->syninfo.max_y;
-
+               three_finger_drag = sc->syninfo.three_finger_drag;
                /* Read current absolute position. */
                x0 = f->x;
                y0 = f->y;
@@ -3888,8 +3891,8 @@ psmgestures(struct psm_softc *sc, finger_t *fingers, i
                                    ~MOUSE_BUTTON1DOWN) | center_button;
                }
 
-               /* If in tap-hold, add the recorded button. */
-               if (gest->in_taphold)
+               /* If in tap-hold or three fingers, add the recorded button. */
+               if (gest->in_taphold || (nfingers == 3 && three_finger_drag))
                        ms->button |= gest->tap_button;
 
                /*
@@ -5755,6 +5758,7 @@ synaptics_sysctl(SYSCTL_HANDLER_ARGS)
                        return (EINVAL);
                break;
         case SYNAPTICS_SYSCTL_TOUCHPAD_OFF:
+       case SYNAPTICS_SYSCTL_THREE_FINGER_DRAG:
        case SYNAPTICS_SYSCTL_NATURAL_SCROLL:
                if (arg < 0 || arg > 1)
                        return (EINVAL);
@@ -6147,6 +6151,14 @@ synaptics_sysctl_create_tree(struct psm_softc *sc, con
            sc, SYNAPTICS_SYSCTL_TOUCHPAD_OFF,
            synaptics_sysctl, "I",
            "Turn off touchpad");
+
+       sc->syninfo.three_finger_drag = 0;
+       SYSCTL_ADD_PROC(&sc->syninfo.sysctl_ctx,
+           SYSCTL_CHILDREN(sc->syninfo.sysctl_tree), OID_AUTO,
+           "three_finger_drag", CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_ANYBODY,
+           sc, SYNAPTICS_SYSCTL_THREE_FINGER_DRAG,
+           synaptics_sysctl, "I",
+           "Enable dragging with three fingers");
 
        /* hw.psm.synaptics.natural_scroll. */
        sc->syninfo.natural_scroll = 0;
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