From 82c23d1bd2c4ea5716ac9e5e859f82be96ac8886 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkaivo@gwu.edu>
Date: Wed, 8 Apr 2015 20:41:03 -0400
Subject: initial commit

---
 Makefile      |   8 ++++
 README        |  18 +++++++++
 penxortouch.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 152 insertions(+)
 create mode 100644 Makefile
 create mode 100644 README
 create mode 100644 penxortouch.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..2fa049d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+CFLAGS=-s
+LDFLAGS=-lX11 -lXi
+
+penxortouch: penxortouch.o
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f penxortouch *.o
diff --git a/README b/README
new file mode 100644
index 0000000..2261ca1
--- /dev/null
+++ b/README
@@ -0,0 +1,18 @@
+This is a simple X11 utility that disables a tablet's touchscreen when the
+digitizer is near.
+
+It requires the XInput extension and its accompanying library.
+
+It's been developed and tested on a ThinkPad Yoga (first generation), which
+is what the input device names are configured for.
+
+A future revision will support naming devices via command line options, but
+for the time being they are compiled in. If you are using a different tablet,
+you may need to edit the values of PENDEVICE and/or TOUCHDEVICE in
+penxortouch.c. Hopefully these names are self-explanatory. The command
+xinput(1) will give you a list of the input devices available on your system.
+
+A future revision will also include a genuine man page. As it is, there are
+no run-time options. Simply run the program, penxortouch, and it will disable
+the touchscreen device whenever the pen device comes in proximity to the
+screen, and reenable the touchscreen when the pen leaves proximity.
diff --git a/penxortouch.c b/penxortouch.c
new file mode 100644
index 0000000..902f6a5
--- /dev/null
+++ b/penxortouch.c
@@ -0,0 +1,126 @@
+/* penxortouch
+
+Copyright (c) 2015 Jakob Kaivo <jakob@kaivo.net>
+
+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 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.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/XInput.h>
+#include <X11/Xatom.h>
+
+#define PENDEVICE	"Wacom ISDv4 EC Pen stylus"
+#define TOUCHDEVICE	"ELAN Touchscreen"
+
+#define DEVPROP		"Device Enabled"
+
+XDevice *
+open_dev(Display *dpy, const char *devname)
+{
+	XDeviceInfo *devs = NULL;
+	XDeviceInfo *devinfo = NULL;
+	XDevice *dev = NULL;
+	int i, ndevs;
+
+	devs = XListInputDevices(dpy, &ndevs);
+	for (i = 0; i < ndevs; i++) {
+		if (!strcmp(devname, devs[i].name)) {
+			devinfo = &devs[i];
+		}
+	}
+
+	if (devinfo) {
+		dev = XOpenDevice(dpy, devinfo->id);
+	}
+	if (!dev) {
+		fprintf(stderr, "Couldn't open device %s.\n", devname);
+	}
+	return dev;
+}
+
+Display *
+open_display(void)
+{
+	int ev, error, xi;
+	Display *dpy = XOpenDisplay(NULL);
+	if (!dpy) {
+		fprintf(stderr, "Couldn't open display.\n");
+	} else if (!XQueryExtension(dpy, "XInputExtension", &xi, &ev, &error)) {
+		fprintf(stderr, "X Input extension not supported.\n");
+		XCloseDisplay(dpy);
+		dpy = NULL;
+	}
+	return dpy;
+}
+
+int
+enable(Display *dpy, XDevice *dev, int en)
+{
+	unsigned char data = (en ? 1 : 0);
+	Atom prop = XInternAtom(dpy, DEVPROP, False);
+	XChangeDeviceProperty(dpy, dev, prop, XA_INTEGER, 8, PropModeReplace, (char*)&data, 1);
+	return 0;
+}
+
+void
+watch(Display *dpy, XDevice *pen, XDevice *touch)
+{
+	XEventClass evlist[2];
+	int i, proxin = -1, proxout = -1;
+	XEvent ev;
+
+	for (i = 0; i < pen->num_classes; i++) {
+		if (pen->classes[i].input_class == ValuatorClass) {
+			ProximityIn(pen, proxin, evlist[0]);
+			ProximityOut(pen, proxout, evlist[1]);
+		}
+	}
+	if(XSelectExtensionEvent(dpy, RootWindow(dpy, DefaultScreen(dpy)), evlist, 2) != 0) {
+		fprintf(stderr, "Couldn't select events.\n");
+		return;
+	}
+
+	while (1) {
+		XNextEvent(dpy, &ev);
+		if (ev.type == proxin) {
+			enable(dpy, touch, 0);
+		} else if (ev.type == proxout) {
+			enable(dpy, touch, 1);
+		}
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	XDevice *pen = NULL, *touch = NULL;
+	Display *dpy = NULL;
+
+	if ((dpy = open_display()) == NULL) goto error;
+	if ((pen = open_dev(dpy, PENDEVICE)) == NULL) goto error;
+	if ((touch = open_dev(dpy, TOUCHDEVICE)) == NULL) goto error;
+	watch(dpy, pen, touch);
+
+	/* Only get here on error conditions */
+error:
+	if (dpy) XCloseDisplay(dpy);
+	return 1;
+}
-- 
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