Introduce bts_shutdown FSM

Using an FSM here will allow for more complex ordered shutdown
procedures, like power ramp down, waiting for TRX deact asyncrhonously,
etc.

Current commit leaves everything in place already prepared to implement
ramp down, which will be implemented in next commit in the series.

Related: SYS#4920
Change-Id: I8f48f17e61c3b9b86342eaf5b8a2b1ac9758bde5

1 files changed, 38 insertions, 0 deletions

diff --git a/include/osmo-bts/bts_shutdown_fsm.h b/include/osmo-bts/bts_shutdown_fsm.h
new file mode 100644
index 00000000..1268b2b6
--- /dev/null
+++ b/include/osmo-bts/bts_shutdown_fsm.h
@@ -0,0 +1,38 @@
+/* BTS shutdown FSM */
+
+/* (C) 2020 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#pragma once
+
+#include <osmocom/core/fsm.h>
+
+/* 3GPP TS 24.008 § 4.1.3.3 GMM mobility management states on the network side */
+enum bts_shutdown_fsm_states {
+	BTS_SHUTDOWN_ST_NONE,
+	BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL,
+	BTS_SHUTDOWN_ST_EXIT,
+};
+
+enum bts_shutdown_fsm_events {
+	BTS_SHUTDOWN_EV_START,
+};
+
+extern struct osmo_fsm bts_shutdown_fsm;