Re: synaptics touchpad doesn't click

[Takashi Iwai <tiwai@suse.de>]

At Wed, 16 Dec 2009 07:50:54 +0100,
I wrote:
> 
> At Tue, 15 Dec 2009 18:59:34 -0800,
> Dmitry Torokhov wrote:
> > 
> > On Tue, Dec 15, 2009 at 06:05:06PM -0700, Alex Chiang wrote:
> > > * Dmitry Torokhov <dmitry.torokhov@gmail.com>:
> > > >
> > > > The updated patch is below.
> > > > 
> > > > -- 
> > > > Dmitry
> > > 
> > > Should I test this one or wait one more iteration to address
> > > Takashi's last comments?
> > > 
> > 
> > Actually I think we took the wrong direction with the original patch and
> > we should do what other buttonless devices (bcm5974) do: report touchpad
> > click as left button and have Synaptics X driver provide enhanced
> > support. This way we can have both modes (ClickZones and ClickButtons)
> > and users will get to chose (provided that someone takes time to add
> > that support to Synaptics driver of course ;) ).
> 
> My concern is, still, how would you identify this device.  Will you
> extend also some ioctls to expose caps and extcaps?  Otherwise it's
> difficult to identify this device automatically from the user-space.
> 
> The user-space can know that it's button-less, yes.  But, how can it
> know whether the device should be emulated via ClickZone?
> We can use a driver option to x11 synaptics driver for that, as I
> already sent you another patch.  However, the driver option is
> nowadays not preferred because xorg.conf is being dead on new
> systems...

FWIW, the patch below is to add clickpad feature to x11 synaptics driver
1.1.3.  It's almost straightforward conversion from my kernel patch.
(The vertical coordinate had to be flipped, though.)


Takashi

---
---
 include/synaptics-properties.h |    3 ++
 include/synaptics.h            |    1 
 man/synaptics.man              |    5 ++++
 src/synaptics.c                |   42 +++++++++++++++++++++++++++++++++++++++++
 src/synapticsstr.h             |    1 
 tools/synclient.c              |    2 +
 6 files changed, 54 insertions(+)

--- a/include/synaptics.h
+++ b/include/synaptics.h
@@ -134,6 +134,7 @@
     double press_motion_min_factor;	    /* factor applied on speed when finger pressure is at minimum */
     double press_motion_max_factor; 	    /* factor applied on speed when finger pressure is at minimum */
     Bool grab_event_device;		    /* grab event device for exclusive use? */
+    Bool clickpad;			    /* clickpad mode */
 } SynapticsSHM;
 
 /*
--- a/src/synaptics.c
+++ b/src/synaptics.c
@@ -499,6 +499,7 @@
     pars->press_motion_min_factor = xf86SetRealOption(opts, "PressureMotionMinFactor", 1.0);
     pars->press_motion_max_factor = xf86SetRealOption(opts, "PressureMotionMaxFactor", 1.0);
     pars->grab_event_device = xf86SetBoolOption(opts, "GrabEventDevice", TRUE);
+    pars->clickpad = xf86SetBoolOption(opts, "Clickpad", FALSE);
 
     /* Warn about (and fix) incorrectly configured TopEdge/BottomEdge parameters */
     if (pars->top_edge > pars->bottom_edge) {
@@ -1902,6 +1903,44 @@
     }
 }
 
+/* left and right clickpad button ranges;
+ * the gap between them is interpreted as a middle-button click
+ */
+#define CLICKPAD_LEFT_BTN_X(p)				\
+    (((p)->maxx - (p)->minx) * 2 / 5 + (p)->minx)
+#define CLICKPAD_RIGHT_BTN_X(p)				\
+    (((p)->maxx - (p)->minx) * 3 / 5 + (p)->minx)
+
+static void
+MangleClickpad(SynapticsPrivate *priv, struct SynapticsHwState *hw)
+{
+    SynapticsSHM *para = priv->synpara;
+
+    /* clickpad mode reports Y over YMAX as a button area */
+    if (hw->y > priv->maxy) {
+	/* clickpad reports only the middle button, and we need
+	 * to fake left/right buttons depending on the touch position
+	 */
+	if (hw->left || hw->middle || hw->right) { /* clicked? */
+	    hw->left = hw->middle = hw->right = 0;
+	    if (hw->x < CLICKPAD_LEFT_BTN_X(priv));
+		hw->left = 1;
+	    else if (hw->x > CLICKPAD_RIGHT_BTN_X(priv))
+		hw->right = 1;
+	    else
+		hw->middle = 1;
+	}
+	/* don't move pointer in the button area */
+	hw->x = para->x;
+	hw->y = para->y;
+	hw->z = 0;
+    } else if (hw->left || hw->middle || hw->right) {
+	/* dragging */
+	hw->left = para->left;
+	hw->right = para->right;
+	hw->middle = para->middle;
+    }
+}
 
 /*
  * React on changes in the hardware state. This function is called every time
@@ -1924,6 +1963,9 @@
     int timeleft;
     int i;
 
+    if (para->clickpad)
+	MangleClickpad(priv, hw);
+
     /* update hardware state in shared memory */
     para->x = hw->x;
     para->y = hw->y;
--- a/src/synapticsstr.h
+++ b/src/synapticsstr.h
@@ -154,6 +154,7 @@
     Bool has_pressure;			/* device reports pressure */
 
     enum TouchpadModel model;          /* The detected model */
+    Bool clickpad;			/* clickpad mode */
 } SynapticsPrivate;
 
 #endif /* _SYNAPTICSSTR_H_ */
--- a/man/synaptics.man
+++ b/man/synaptics.man
@@ -411,6 +411,11 @@
 .
 This can be achieved by switching to a text console and then switching
 back to X.
+.TP 7
+.BI "Option \*qClickpad\*q \*q" boolean \*q
+Supports Clickpad.  The driver handles a middle-button click in the
+special low area as left/right/middle buttons according to the position.
+This mode works only with evdev protocol.
 .
 .
 .LP
--- a/tools/synclient.c
+++ b/tools/synclient.c
@@ -209,6 +209,8 @@
 		SYNAPTICS_PROP_PRESSURE_MOTION_FACTOR,	0 /*float*/,	1),
     DEFINE_PAR("GrabEventDevice",      grab_event_device,       PT_BOOL,   0, 1,
 		SYNAPTICS_PROP_GRAB,	8,	0),
+    DEFINE_PAR("Clickpad",             clickpad,                PT_BOOL,   0, 1,
+		SYNAPTICS_PROP_CLICKPAD,	8,	0),
     { NULL, 0, 0, 0, 0 }
 };
 
--- a/include/synaptics-properties.h
+++ b/include/synaptics-properties.h
@@ -142,4 +142,7 @@
 /* 8 bit (BOOL) */
 #define SYNAPTICS_PROP_GRAB "Synaptics Grab Event Device"
 
+/* 8 bit (BOOL) */
+#define SYNAPTICS_PROP_CLICKPAD "Synaptics Clickpad Mode"
+
 #endif /* _SYNAPTICS_PROPERTIES_H_ */