Add first steps for a udev based modem detection plugin

Makefile.am

@@ -39,6 +39,13 @@ gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \
 				gatchat/gatsyntax.h gatchat/gatsyntax.c \
 				gatchat/ringbuffer.h gatchat/ringbuffer.c
 
+if UDEV
+builtin_modules += udev
+builtin_sources += plugins/udev.c
+builtin_cflags += @UDEV_CFLAGS@
+builtin_libadd += @UDEV_LIBS@
+endif
+
 if ISIMODEM
 builtin_modules += isimodem
 builtin_sources += $(gisi_sources) drivers/isimodem/isi.h \

plugins/udev.c

@@ -0,0 +1,69 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2008-2009  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+
+#define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
+#include <libudev.h>
+
+#include <glib.h>
+
+#define OFONO_API_SUBJECT_TO_CHANGE
+#include <ofono/plugin.h>
+#include <ofono/log.h>
+
+static struct udev *udev_ctx;
+static struct udev_monitor *udev_mon;
+
+static int udev_init(void)
+{
+	udev_ctx = udev_new();
+	if (udev_ctx == NULL) {
+		ofono_error("Failed to create udev context");
+		return -EIO;
+	}
+
+	udev_mon = udev_monitor_new_from_netlink(udev_ctx, "udev");
+	if (udev_mon == NULL) {
+		ofono_error("Failed to create udev monitor");
+		udev_unref(udev_ctx);
+		udev_ctx = NULL;
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void udev_exit(void)
+{
+	if (udev_ctx == NULL)
+		return;
+
+	udev_monitor_unref(udev_mon);
+	udev_unref(udev_ctx);
+}
+
+OFONO_PLUGIN_DEFINE(udev, "udev hardware detection", VERSION,
+			OFONO_PLUGIN_PRIORITY_DEFAULT, udev_init, udev_exit)