Add gain support to transceiver application

To alter default gain of 0, the gain can be altered by using SETRXGAIN
control command.

Please use a gain of 0, for normal use.

4 files changed, 19 insertions, 6 deletions

diff --git a/src/host/layer23/src/transceiver/l1ctl.c b/src/host/layer23/src/transceiver/l1ctl.c
index e4cda24d..0c66f128 100644
--- a/src/host/layer23/src/transceiver/l1ctl.c
+++ b/src/host/layer23/src/transceiver/l1ctl.c
@@ -113,7 +113,8 @@ l1ctl_tx_fbsb_req(struct l1ctl_link *l1l,
 
 int
 l1ctl_tx_bts_mode(struct l1ctl_link *l1l,
-                  uint8_t enabled, uint8_t bsic, uint16_t band_arfcn)
+                  uint8_t enabled, uint8_t bsic, uint16_t band_arfcn,
+                  int gain)
 {
 	struct msgb *msg;
 	struct l1ctl_bts_mode *be;
@@ -122,13 +123,14 @@ l1ctl_tx_bts_mode(struct l1ctl_link *l1l,
 	if (!msg)
 		return -1;
 
-	LOGP(DL1C, LOGL_INFO, "BTS Mode (enabled=%u, bsic=%u, arfcn=%u)\n",
-		enabled, bsic, band_arfcn);
+	LOGP(DL1C, LOGL_INFO, "BTS Mode (enabled=%u, bsic=%u, arfcn=%u "
+		"gain=%d)\n", enabled, bsic, band_arfcn, gain);
 
 	be = (struct l1ctl_bts_mode *) msgb_put(msg, sizeof(*be));
 	be->enabled = enabled;
 	be->bsic = bsic;
 	be->band_arfcn = htons(band_arfcn);
+	be->gain = gain;
 
 	return l1l_send(l1l, msg);
 }
diff --git a/src/host/layer23/src/transceiver/l1ctl.h b/src/host/layer23/src/transceiver/l1ctl.h
index da7769d2..9856fc2f 100644
--- a/src/host/layer23/src/transceiver/l1ctl.h
+++ b/src/host/layer23/src/transceiver/l1ctl.h
@@ -39,7 +39,7 @@ int l1ctl_tx_fbsb_req(struct l1ctl_link *l1l,
 	uint16_t arfcn, uint8_t flags, uint16_t timeout,
 	uint8_t sync_info_idx, uint8_t ccch_mode);
 int l1ctl_tx_bts_mode(struct l1ctl_link *l1l,
-	uint8_t enabled, uint8_t bsic, uint16_t band_arfcn);
+	uint8_t enabled, uint8_t bsic, uint16_t band_arfcn, int gain);
 int l1ctl_tx_bts_burst_req(struct l1ctl_link *l1l,
 	uint32_t fn, uint8_t tn, struct burst_data *burst);
 
diff --git a/src/host/layer23/src/transceiver/trx.c b/src/host/layer23/src/transceiver/trx.c
index 9149b7ca..ae21344d 100644
--- a/src/host/layer23/src/transceiver/trx.c
+++ b/src/host/layer23/src/transceiver/trx.c
@@ -128,6 +128,7 @@ trx_alloc(const char *addr, uint16_t base_port, struct l1ctl_link *l1l)
 	/* Init */
 	trx->arfcn = ARFCN_INVAL;
 	trx->bsic = BSIC_INVAL;
+	trx->gain = 0; /* Best test results for broadest range of RX levels */
 
 	/* L1 link */
 	trx->l1l = l1l;
@@ -227,7 +228,7 @@ _trx_ctrl_send_resp(struct trx *trx, const char *cmd, const char *fmt, ...)
 static int
 _trx_ctrl_cmd_poweroff(struct trx *trx, const char *cmd, const char *args)
 {
-	l1ctl_tx_bts_mode(trx->l1l, 0, 0, 0);
+	l1ctl_tx_bts_mode(trx->l1l, 0, 0, 0, 0);
 
 	return _trx_ctrl_send_resp(trx, cmd, "%d", 0);
 }
@@ -242,7 +243,7 @@ _trx_ctrl_cmd_poweron(struct trx *trx, const char *cmd, const char *args)
 			"TRX received POWERON when not fully configured\n");
 		rv = -EINVAL;
 	} else {
-		rv = l1ctl_tx_bts_mode(trx->l1l, 1, trx->bsic, trx->arfcn);
+		rv = l1ctl_tx_bts_mode(trx->l1l, 1, trx->bsic, trx->arfcn, trx->gain);
 	}
 
 	return _trx_ctrl_send_resp(trx, cmd, "%d", rv);
@@ -278,6 +279,15 @@ _trx_ctrl_cmd_setrxgain(struct trx *trx, const char *cmd, const char *args)
 {
 	int db = atoi(args);
 
+	if (db < 0 || db > 63) {
+		LOGP(DTRX, LOGL_ERROR, "Invalid gain received\n");
+		return _trx_ctrl_send_resp(trx, cmd, "%d %d", -1, db);
+	}
+
+	trx->gain = db;
+
+	l1ctl_tx_bts_mode(trx->l1l, 1, trx->bsic, trx->arfcn, trx->gain);
+
 	return _trx_ctrl_send_resp(trx, cmd, "%d %d", 0, db);
 }
 
diff --git a/src/host/layer23/src/transceiver/trx.h b/src/host/layer23/src/transceiver/trx.h
index 0571cab2..19e02fcf 100644
--- a/src/host/layer23/src/transceiver/trx.h
+++ b/src/host/layer23/src/transceiver/trx.h
@@ -50,6 +50,7 @@ struct trx {
 	/* TRX configuration */
 	uint16_t arfcn;
 	uint8_t  bsic;
+	int gain;
 };