1 files changed, 93 insertions, 0 deletions
diff --git a/openbsc/src/silent_call.c b/openbsc/src/silent_call.c
new file mode 100644
index 000000000..82b656327
--- /dev/null
+++ b/openbsc/src/silent_call.c
@@ -0,0 +1,93 @@
+/* GSM silent call feature */
+
+/*
+ * (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ *
+ * 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <openbsc/msgb.h>
+#include <openbsc/signal.h>
+#include <openbsc/debug.h>
+#include <openbsc/paging.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/chan_alloc.h>
+
+static int paging_cb_silent(unsigned int hooknum, unsigned int event,
+			    struct msgb *msg, void *_lchan, void *_data)
+{
+	struct gsm_lchan *lchan = _lchan;
+	struct scall_signal_data sigdata;
+	int rc;
+
+	if (hooknum != GSM_HOOK_RR_PAGING)
+		return -EINVAL;
+
+	DEBUGP(DSMS, "paging_cb_silent: ");
+
+	sigdata.lchan = lchan;
+	sigdata.data = _data;
+
+	switch (event) {
+	case GSM_PAGING_SUCCEEDED:
+		DEBUGPC(DSMS, "success, using Timeslot %u on ARFCN %u\n",
+			lchan->ts->nr, lchan->ts->trx->arfcn);
+		/* increment lchan reference count */
+		dispatch_signal(SS_SCALL, S_SCALL_SUCCESS, &sigdata);
+		use_lchan(lchan);
+		break;
+	case GSM_PAGING_EXPIRED:
+		DEBUGP(DSMS, "expired\n");
+		dispatch_signal(SS_SCALL, S_SCALL_EXPIRED, &sigdata);
+		break;
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
+
+int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data)
+{
+	int rc;
+
+	rc = paging_request(subscr->net, subscr, RSL_CHANNEED_TCH_F,
+			    paging_cb_silent, data);
+	return rc;
+}
+
+int gsm_silent_call_stop(struct gsm_subscriber *subscr)
+{
+	struct gsm_lchan *lchan;
+
+	lchan = lchan_for_subscr(subscr);
+	if (!lchan)
+		return -EINVAL;
+
+	/* FIXME: did we actually establish a silent call for this guy? */
+	put_lchan(lchan);
+
+	return 0;
+}