From 9a151091ccff8e8228e83e7e962d6bf1a234ec98 Mon Sep 17 00:00:00 2001
From: Andreas Eversberg <jolly@eversberg.eu>
Date: Tue, 3 Jan 2023 18:50:53 +0100
Subject: [PATCH] Add function to set Sa bits to common part

Change-Id: I4f5f975f0e5f708ae573a1e1ce41c6a08c207fad
---
 TODO-RELEASE                    |  1 +
 include/osmocom/abis/e1_input.h |  9 +++++++++
 src/e1_input.c                  | 10 ++++++++++
 3 files changed, 20 insertions(+)

diff --git a/TODO-RELEASE b/TODO-RELEASE
index d0852fc..c021505 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what		description / commit summary line
+libosmo-abis	struct e1inp_driver Field added at the end (ABI break)
diff --git a/include/osmocom/abis/e1_input.h b/include/osmocom/abis/e1_input.h
index 7b97a46..a66f8eb 100644
--- a/include/osmocom/abis/e1_input.h
+++ b/include/osmocom/abis/e1_input.h
@@ -187,6 +187,9 @@ struct e1inp_driver {
 	int default_delay;
 	int has_keepalive;
 	const char *bind_addr;
+
+	/* Set Sa bits to transmit in TS0 (MSB to LSB): Sa8 Sa7 Sa5 Sa4 Sa64 Sa63 Sa62 Sa61/Sa6 */
+	int (*set_sa_bits)(struct e1inp_line *line, uint8_t sa_bits);
 };
 
 struct e1inp_line_ops {
@@ -328,6 +331,12 @@ int e1inp_ts_config_hdlc(struct e1inp_ts *ts, struct e1inp_line *line,
 /* configure and initialize one timeslot dedicated to nothing */
 int e1inp_ts_config_none(struct e1inp_ts *ts, struct e1inp_line *line);
 
+/*
+ * configure Sa bits on TS0, if supported by driver (TABLE 5A and 5B of ITU-T G.704)
+ * sa_bits (MSB to LSB): Sa8 Sa7 Sa5 Sa4 Sa64 Sa63 Sa62 Sa61/Sa6
+ */
+int e1inp_ts_set_sa_bits(struct e1inp_line *line, uint8_t sa_bits);
+
 /* obtain a string identifier/name for the given timeslot */
 void e1inp_ts_name(char *out, size_t out_len, const struct e1inp_ts *ts);
 
diff --git a/src/e1_input.c b/src/e1_input.c
index a7313dd..2d10513 100644
--- a/src/e1_input.c
+++ b/src/e1_input.c
@@ -455,6 +455,16 @@ int e1inp_ts_config_none(struct e1inp_ts *ts, struct e1inp_line *line)
 	return 0;
 }
 
+int e1inp_ts_set_sa_bits(struct e1inp_line *line, uint8_t sa_bits)
+{
+	struct e1inp_driver *driver;
+
+	driver = line->driver;
+	if (!driver->set_sa_bits)
+		return -ENOTSUP;
+	return driver->set_sa_bits(line, sa_bits);
+}
+
 static int e1inp_line_use_cb(struct osmo_use_count_entry *use_count_entry, int32_t old_use_count,
 			     const char *file, int file_line)
 {