Date: Sat, 10 Dec 2005 18:29:41 +0100

From: Alberto Mardegan <mardy@users.sourceforge.net>
To: sdl@libsdl.org
Subject: [SDL] [PATCH] Touchscreen support to fbcon via tslib


Hi all!

  I'm new to this list, I just subscribed. I've attached to this e-mail
a patch I've written in order to add Touchscreen support to SDL's fbcon
module via the tslib library.
Since it introduces a new dependency, I've also edited the the
configure.in file and added it as a compile-time option.

This patch is especially useful for handhelds (I've tested it in my
Zaurus).
Please consider applying it. :-)


--
Saluti,
    Mardy
http://interlingua.altervista.org

configure.in

@@ -1233,6 +1233,29 @@ CheckInputEvents()
     fi
 }
 
+dnl See if we can use the Touchscreen input library
+CheckTslib()
+{
+    AC_ARG_ENABLE(input-tslib,
+[  --enable-input-tslib    use the Touchscreen library for input [default=yes]],
+                  , enable_input_tslib=yes)
+    if test x$enable_input_tslib = xyes; then
+        AC_MSG_CHECKING(for Touchscreen library support)
+        enable_input_tslib=no
+        AC_TRY_COMPILE([
+          #include "tslib.h"
+        ],[
+        ],[
+        enable_input_tslib=yes
+        ])
+        AC_MSG_RESULT($enable_input_tslib)
+        if test x$enable_input_tslib = xyes; then
+            CFLAGS="$CFLAGS -DHAVE_TSLIB"
+            SYSTEM_LIBS="$SYSTEM_LIBS -lts"
+        fi
+    fi
+}
+
 dnl See if we can use GNU pth library for threads
 CheckPTH()
 {
@@ -2078,6 +2101,7 @@ case "$target" in
         CheckPicoGUI
         CheckOpenGLX11
         CheckInputEvents
+        CheckTslib
         CheckPTHREAD
         CheckSIGACTION
         CheckAltivec

src/video/fbcon/SDL_fbevents.c

@@ -317,11 +317,19 @@ static enum {
 	MOUSE_MS,
 	MOUSE_BM,
 	MOUSE_ELO,
+	MOUSE_TSLIB,
 	NUM_MOUSE_DRVS
 } mouse_drv = MOUSE_NONE;
 
 void FB_CloseMouse(_THIS)
 {
+#ifdef HAVE_TSLIB
+	if (ts_dev != NULL) {
+		ts_close(ts_dev);
+		ts_dev = NULL;
+		mouse_fd = -1;
+	}
+#endif /* HAVE_TSLIB */
 	if ( mouse_fd > 0 ) {
 		close(mouse_fd);
 	}
@@ -500,6 +508,25 @@ int FB_OpenMouse(_THIS)
 	mousedev = getenv("SDL_MOUSEDEV");
 	mouse_fd = -1;
 
+#ifdef HAVE_TSLIB
+	if ((mousedrv != NULL) && (strcmp(mousedrv, "TSLIB") == 0)) {
+		if (mousedev == NULL) mousedev = getenv("TSLIB_TSDEVICE");
+		if (mousedev != NULL) {
+			ts_dev = ts_open(mousedev, 1);
+			if ((ts_dev != NULL) && (ts_config(ts_dev) >= 0)) {
+#ifdef DEBUG_MOUSE
+				fprintf(stderr, "Using tslib touchscreen\n");
+#endif
+				mouse_drv = MOUSE_TSLIB;
+				mouse_fd = ts_fd(ts_dev);
+				return mouse_fd;
+			}
+		}
+		mouse_drv = MOUSE_NONE;
+		return mouse_fd;
+	}
+#endif /* HAVE_TSLIB */
+
 	/* ELO TOUCHSCREEN SUPPORT */
 
 	if( (mousedrv != NULL) && (strcmp(mousedrv, "ELO") == 0) ) {
@@ -642,6 +669,22 @@ void FB_vgamousecallback(int button, int relative, int dx, int dy)
 	}
 }
 
+/* Handle input from tslib */
+#ifdef HAVE_TSLIB
+static void handle_tslib(_THIS)
+{
+	struct ts_sample sample;
+	int button;
+
+	while (ts_read(ts_dev, &sample, 1) > 0) {
+		button = (sample.pressure > 0) ? 1 : 0;
+		button <<= 2;	/* must report it as button 3 */
+    	FB_vgamousecallback(button, 0, sample.x, sample.y);
+	}
+	return;
+}
+#endif /* HAVE_TSLIB */
+
 /* For now, use MSC, PS/2, and MS protocols
    Driver adapted from the SVGAlib mouse driver code (taken from gpm, etc.)
  */
@@ -678,6 +721,11 @@ static void handle_mouse(_THIS)
 			packetsize = ELO_PACKET_SIZE;
 			relative = 0;
 			break;
+		case MOUSE_TSLIB:
+#ifdef HAVE_TSLIB
+			handle_tslib(this);
+#endif
+			return; /* nothing left to do */
 		case NUM_MOUSE_DRVS:
 			/* Uh oh.. */
 			packetsize = 0;

src/video/fbcon/SDL_fbvideo.h

@@ -35,6 +35,9 @@ static char rcsid =
 #include "SDL_mouse.h"
 #include "SDL_mutex.h"
 #include "SDL_sysvideo.h"
+#ifdef HAVE_TSLIB
+#include "tslib.h"
+#endif
 
 /* Hidden "this" pointer for the video functions */
 #define _THIS	SDL_VideoDevice *this
@@ -65,6 +68,9 @@ struct SDL_PrivateVideoData {
 	struct termios saved_kbd_termios;
 
 	int mouse_fd;
+#ifdef HAVE_TSLIB
+	struct tsdev *ts_dev;
+#endif
 
 	char *mapped_mem;
 	int mapped_memlen;
@@ -95,6 +101,9 @@ struct SDL_PrivateVideoData {
 #define saved_kbd_mode		(this->hidden->saved_kbd_mode)
 #define saved_kbd_termios	(this->hidden->saved_kbd_termios)
 #define mouse_fd		(this->hidden->mouse_fd)
+#ifdef HAVE_TSLIB
+#define ts_dev			(this->hidden->ts_dev)
+#endif /* HAVE_TSLIB */
 #define cache_vinfo		(this->hidden->cache_vinfo)
 #define saved_vinfo		(this->hidden->saved_vinfo)
 #define saved_cmaplen		(this->hidden->saved_cmaplen)