- make the use of NETLINK_KOBJECT_UEVENT for hotplug events optional

(conditionally compiled). The configure script autodetects whether hotplug
  should be enabled by default or not, based on the output of uname. The user
  can override that decision with --enable-hotplug and --disable-hotplug.


git-svn-id: svn+ssh://svn.code.sf.net/p/spacenav/code/trunk/spacenavd@92 ef983eb1-d774-4af8-acfd-baaf7b16a646

configure

@@ -1,9 +1,36 @@
 #!/bin/sh
 
+test_kver() {
+	req_major=`echo $1 | awk -F . '{ print $1 }'`
+	req_minor=`echo $1 | awk -F . '{ print $2 }'`
+	req_rev=`echo $1 | awk -F . '{ print $3 }'`
+
+	linux_rev=`uname -r`
+	kver_major=`echo $linux_rev | awk -F . '{ print $1 }'`
+	kver_minor=`echo $linux_rev | awk -F . '{ print $2 }'`
+	kver_rev=`echo $linux_rev | awk -F . '{ print $3 }'`
+
+	if [ "$kver_major" -lt "$req_major" ]; then
+		return 1
+	fi
+	if [ "$kver_major" = "$req_major" ]; then
+		if [ "$kver_minor" -lt "$req_minor" ]; then
+			return 1
+		fi
+
+		if [ "$kver_minor" = "$req_minor" -a "$kver_rev" -lt "$req_rev" ]; then
+			return 1
+		fi
+	fi
+	return 0
+}
+
+
 PREFIX=/usr/local
 OPT=yes
 DBG=yes
 X11=yes
+HOTPLUG=yes
 VER=`head -1 README | sed 's/^.*- //'`
 
 if echo $VER | grep '$Rev' >/dev/null; then
@@ -12,8 +39,25 @@ fi
 
 echo "configuring spacenavd - $VER"
 
+# linux check
+if [ `uname -s` != Linux ]; then
+	echo 'This spacenav driver only works on linux at the moment.'
+	echo "If you would like to help porting it to " `uname -s` ", your help is \
+most welcome. Please check out the README file for details on how you can join \
+us and contribute to the project."
+	exit 1
+fi
+
+# NETLINK_KOBJECT_UEVENT used for hotplug detection requires 2.6.10
+if test_kver 2.6.10; then
+	HOTPLUG=yes
+else
+	HOTPLUG=no
+fi
+
 srcdir="`dirname "$0"`"
 
+# process arguments
 for arg; do
 	case "$arg" in
 	--prefix=*)
@@ -36,12 +80,19 @@ for arg; do
 	--disable-x11)
 		X11=no;;
 
+	--enable-hotplug)
+		HOTPLUG=yes;;
+	--disable-hotplug)
+		HOTPLUG=no;;
+
 	--help)
 		echo 'usage: ./configure [options]'
 		echo 'options:'
 		echo '  --prefix=<path>: installation path (default: /usr/local)'
 		echo '  --enable-x11: enable X11 communication mode (default)'
 		echo '  --disable-x11: disable X11 communication mode'
+		echo '  --enable-hotplug: enable hotplug using NETLINK_KOBJECT_UEVENT (default)'
+		echo '  --disable-hotplug: disable hotplug, fallback to polling for the device'
 		echo '  --enable-opt: enable speed optimizations (default)'
 		echo '  --disable-opt: disable speed optimizations'
 		echo '  --enable-debug: include debugging symbols (default)'
@@ -56,6 +107,7 @@ echo "  prefix: $PREFIX"
 echo "  optimize for speed: $OPT"
 echo "  include debugging symbols: $DBG"
 echo "  x11 communication method: $X11"
+echo "  use hotplug: $HOTPLUG"
 echo ""
 
 if [ "$X11" = "no" ]; then
@@ -95,6 +147,10 @@ if [ "$X11" = yes ]; then
 	echo '#define USE_X11' >>src/config.h
 	echo >>src/config.h
 fi
+if [ "$HOTPLUG" = yes ]; then
+	echo '#define USE_NETLINK' >>src/config.h
+	echo >>src/config.h
+fi
 echo '#define VERSION "'$VER'"' >>src/config.h
 echo >>src/config.h
 echo '#endif	/* CONFIG_H_ */' >>src/config.h

src/dev_linux.c

@@ -28,7 +28,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <sys/time.h>
+#ifdef USE_NETLINK
 #include <linux/netlink.h>
+#endif
 #include <linux/types.h>
 #include <linux/input.h>
 #include "dev.h"
@@ -126,7 +128,9 @@ int handle_hotplug(void)
 
 static int con_hotplug(void)
 {
-	int s;
+	int s = -1;
+
+#ifdef USE_NETLINK
 	struct sockaddr_nl addr;
 
 	if((s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT)) == -1) {
@@ -144,6 +148,7 @@ static int con_hotplug(void)
 		close(s);
 		return -1;
 	}
+#endif	/* USE_NETLINK */
 
 	return s;
 }