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trxcon/l1sched: add l1sched_find_lchan_by_chan_nr()

Change-Id: I9917a932c9a4aeb4b3ef7053bd58066b3aa41edb
Related: OS#5500
---
M src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
M src/host/trxcon/src/sched_trx.c
2 files changed, 34 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/03/32303/1

diff --git a/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h b/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
index 7f7e96d..4728f41 100644
--- a/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
+++ b/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
@@ -438,6 +438,8 @@
 int l1sched_deactivate_lchan(struct l1sched_ts *ts, enum l1sched_lchan_type chan);
 struct l1sched_lchan_state *l1sched_find_lchan_by_type(struct l1sched_ts *ts,
 						       enum l1sched_lchan_type type);
+struct l1sched_lchan_state *l1sched_find_lchan_by_chan_nr(struct l1sched_state *sched,
+							  uint8_t chan_nr, uint8_t link_id);
 
 /* Primitive management functions */
 struct l1sched_ts_prim *l1sched_prim_push(struct l1sched_state *sched,
diff --git a/src/host/trxcon/src/sched_trx.c b/src/host/trxcon/src/sched_trx.c
index 49dadd2..c337661 100644
--- a/src/host/trxcon/src/sched_trx.c
+++ b/src/host/trxcon/src/sched_trx.c
@@ -425,6 +425,28 @@
 	return NULL;
 }
 
+struct l1sched_lchan_state *l1sched_find_lchan_by_chan_nr(struct l1sched_state *sched,
+							  uint8_t chan_nr, uint8_t link_id)
+{
+	const struct l1sched_ts *ts = sched->ts[chan_nr & 0x07];
+	const struct l1sched_lchan_desc *lchan_desc;
+	struct l1sched_lchan_state *lchan;
+
+	if (ts == NULL)
+		return NULL;
+
+	llist_for_each_entry(lchan, &ts->lchans, list) {
+		lchan_desc = &l1sched_lchan_desc[lchan->type];
+		if (lchan_desc->chan_nr != (chan_nr & 0xf8))
+			continue;
+		if (lchan_desc->link_id != link_id)
+			continue;
+		return lchan;
+	}
+
+	return NULL;
+}
+
 int l1sched_set_lchans(struct l1sched_ts *ts, uint8_t chan_nr,
 		       int active, uint8_t tch_mode, uint8_t tsc)
 {

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