Author: wulf
Date: Mon Jun  3 10:04:34 2019
New Revision: 348529
URL: https://svnweb.freebsd.org/changeset/base/348529

Log:
  psm(4): Add natural scrolling support to sysmouse protocol
  
  This change enables natural scrolling with two finger scroll enabled
  and when user is using a trackpad (mouse and trackpoint are not affected).
  Depending on trackpad model it can be activated with setting of
  hw.psm.synaptics.natural_scroll or hw.psm.elantech.natural_scroll sysctl
  values to 1.
  
  Evdev protocol is not affected by this change too. Tune userland client
  e.g. libinput to enable natural scrolling in that case.
  
  Submitted by: nyan_myuji.xyz
  Reviewed by:  wulf
  MFC after:    2 weeks
  Differential Revision:        https://reviews.freebsd.org/D20447

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

Modified: head/sys/dev/atkbdc/psm.c
==============================================================================
--- head/sys/dev/atkbdc/psm.c   Mon Jun  3 07:57:54 2019        (r348528)
+++ head/sys/dev/atkbdc/psm.c   Mon Jun  3 10:04:34 2019        (r348529)
@@ -236,6 +236,7 @@ typedef struct synapticsinfo {
        int                      softbutton3_x;
        int                      max_x;
        int                      max_y;
+       int                      natural_scroll;
 } synapticsinfo_t;
 
 typedef struct synapticspacket {
@@ -571,6 +572,8 @@ 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_NATURAL_SCROLL =       SYN_OFFSET(natural_scroll),
+#define        SYNAPTICS_SYSCTL_LAST   SYNAPTICS_SYSCTL_NATURAL_SCROLL
 };
 
 /* packet formatting function */
@@ -4134,6 +4137,7 @@ psmsmoother(struct psm_softc *sc, finger_t *f, int smo
                int len, weight_prev_x, weight_prev_y;
                int div_max_x, div_max_y, div_x, div_y;
                int is_fuzzy;
+               int natural_scroll;
 
                /* Read sysctl. */
                /* XXX Verify values? */
@@ -4161,6 +4165,7 @@ psmsmoother(struct psm_softc *sc, finger_t *f, int smo
                two_finger_scroll = sc->syninfo.two_finger_scroll;
                max_x = sc->syninfo.max_x;
                max_y = sc->syninfo.max_y;
+               natural_scroll = sc->syninfo.natural_scroll;
 
                is_fuzzy = (f->flags & PSM_FINGER_FUZZY) != 0;
 
@@ -4322,14 +4327,24 @@ psmsmoother(struct psm_softc *sc, finger_t *f, int smo
                            smoother_id, dx, dy, dxp, dyp));
                        break;
                case 1: /* Vertical scrolling. */
-                       if (dyp != 0)
-                               ms->button |= (dyp > 0) ?
-                                   MOUSE_BUTTON4DOWN : MOUSE_BUTTON5DOWN;
+                       if (dyp != 0) {
+                               if (two_finger_scroll && natural_scroll)
+                                       ms->button |= (dyp > 0) ?
+                                           MOUSE_BUTTON5DOWN : 
MOUSE_BUTTON4DOWN;
+                               else
+                                       ms->button |= (dyp > 0) ?
+                                           MOUSE_BUTTON4DOWN : 
MOUSE_BUTTON5DOWN;
+                       }
                        break;
                case 2: /* Horizontal scrolling. */
-                       if (dxp != 0)
-                               ms->button |= (dxp > 0) ?
-                                   MOUSE_BUTTON7DOWN : MOUSE_BUTTON6DOWN;
+                       if (dxp != 0) {
+                               if (two_finger_scroll && natural_scroll)
+                                       ms->button |= (dxp > 0) ?
+                                           MOUSE_BUTTON6DOWN : 
MOUSE_BUTTON7DOWN;
+                               else
+                                       ms->button |= (dxp > 0) ?
+                                           MOUSE_BUTTON7DOWN : 
MOUSE_BUTTON6DOWN;
+                       }
                        break;
                }
 
@@ -5641,7 +5656,7 @@ synaptics_sysctl(SYSCTL_HANDLER_ARGS)
        int error, arg;
 
        if (oidp->oid_arg1 == NULL || oidp->oid_arg2 < 0 ||
-           oidp->oid_arg2 > SYNAPTICS_SYSCTL_SOFTBUTTON3_X)
+           oidp->oid_arg2 > SYNAPTICS_SYSCTL_LAST)
                return (EINVAL);
 
        sc = oidp->oid_arg1;
@@ -5730,6 +5745,7 @@ synaptics_sysctl(SYSCTL_HANDLER_ARGS)
                        return (EINVAL);
                break;
         case SYNAPTICS_SYSCTL_TOUCHPAD_OFF:
+       case SYNAPTICS_SYSCTL_NATURAL_SCROLL:
                if (arg < 0 || arg > 1)
                        return (EINVAL);
                break;
@@ -6121,6 +6137,15 @@ synaptics_sysctl_create_tree(struct psm_softc *sc, con
            sc, SYNAPTICS_SYSCTL_TOUCHPAD_OFF,
            synaptics_sysctl, "I",
            "Turn off touchpad");
+
+       /* hw.psm.synaptics.natural_scroll. */
+       sc->syninfo.natural_scroll = 0;
+       SYSCTL_ADD_PROC(&sc->syninfo.sysctl_ctx,
+           SYSCTL_CHILDREN(sc->syninfo.sysctl_tree), OID_AUTO,
+           "natural_scroll", CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_ANYBODY,
+           sc, SYNAPTICS_SYSCTL_NATURAL_SCROLL,
+           synaptics_sysctl, "I",
+           "Enable natural scrolling");
 
        sc->syninfo.softbuttons_y = 0;
        sc->syninfo.softbutton2_x = 0;
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