add e1inp_ericsson_set_altc() to unixsocket driver

e1inp_ericsson_set_altc() set the a-bis lower traffic channel mode.
timeslot is needed to bootstrap the siu.
superchannel is used for everything else

Change-Id: I3eeac681f238cdbc4bb19e18155f0b0e93aefeb7

2 files changed, 27 insertions, 0 deletions

diff --git a/include/osmocom/abis/e1_input.h b/include/osmocom/abis/e1_input.h
index 4c7f8a0..078eaea 100644
--- a/include/osmocom/abis/e1_input.h
+++ b/include/osmocom/abis/e1_input.h
@@ -303,6 +303,9 @@ int e1inp_vty_init(void);
 struct gsm_network;
 int ipaccess_setup(struct gsm_network *gsmnet);
 
+/* activate superchannel or deactive to use timeslots. only valid for unixsocket driver */
+void e1inp_ericsson_set_altc(struct e1inp_line *unixlinue, int superchannel);
+
 extern struct llist_head e1inp_driver_list;
 extern struct llist_head e1inp_line_list;
 
diff --git a/src/input/unixsocket.c b/src/input/unixsocket.c
index 6f758e5..779c93e 100644
--- a/src/input/unixsocket.c
+++ b/src/input/unixsocket.c
@@ -214,3 +214,27 @@ void e1inp_unixsocket_init(void)
 	tall_unixsocket_ctx = talloc_named_const(libosmo_abis_ctx, 1, "unixsocket");
 	e1inp_driver_register(&unixsocket_driver);
 }
+
+void e1inp_ericsson_set_altc(struct e1inp_line *unixline, int superchannel)
+{
+	struct unixsocket_line *config = unixline->driver_data;
+	struct msgb *msg;
+
+	if (unixline->driver != &unixsocket_driver) {
+		LOGP(DLMI, LOGL_NOTICE, "altc is only supported by unixsocket\n");
+		return;
+	}
+
+	if (!config) {
+		LOGP(DLMI, LOGL_NOTICE, "e1inp driver not yet initialized.\n");
+		return;
+	}
+
+	msg = msgb_alloc_headroom(100, 100, "ALTTC");
+
+	/* magic */
+	msgb_put_u32(msg, 0x23004200);
+	msgb_put_u8(msg, superchannel ? 1 : 0);
+
+	unixsocket_write_msg(msg, &config->fd);
+}