LMSDevice: Compute TxGain on LimeSuite API based on expected Tx output power

Right now, according to a few measurements taken on LimeMicro devices, we
expect the Tx Gain at UHD level to relate 1:1 with the slope in Tx output
power given a specific band.

If more fine-grained results are wanted or some device doesn't follow a
1:1 slope relationship, functions TxGain2TxPower and TxPower2TxGain need
to be adapted/improved.

This patch is basically doing the same thing as was done previously for
UHDDevice in 992c9bd1cea410e2dd42ce7566299104b5648aff.

Related: OS#4583
Change-Id: If154fe4d4cd118aa30ea43c22ee7119117b77da6

1 files changed, 15 insertions, 12 deletions

diff --git a/Transceiver52M/device/lms/LMSDevice.h b/Transceiver52M/device/lms/LMSDevice.h
index c83fed2..b6a6ab9 100644
--- a/Transceiver52M/device/lms/LMSDevice.h
+++ b/Transceiver52M/device/lms/LMSDevice.h
@@ -32,6 +32,10 @@
 #include <iostream>
 #include <lime/LimeSuite.h>
 
+extern "C" {
+#include <osmocom/gsm/gsm_utils.h>
+}
+
 /* Definition of LIMESDR_TX_AMPL limits maximum amplitude of I and Q
  * channels separately. Hence LIMESDR_TX_AMPL value must be 1/sqrt(2) =
  * 0.7071.... to get an amplitude of 1 of the complex signal:
@@ -48,6 +52,8 @@ enum lms_dev_type {
 	LMS_DEV_UNKNOWN,
 };
 
+struct dev_band_desc;
+
 /** A class to handle a LimeSuite supported device */
 class LMSDevice:public RadioDevice {
 
@@ -66,6 +72,7 @@ private:
 	TIMESTAMP ts_initial, ts_offset;
 
 	std::vector<double> tx_gains, rx_gains;
+	enum gsm_band band;
 
 	enum lms_dev_type m_dev_type;
 
@@ -77,19 +84,11 @@ private:
 	void update_stream_stats_rx(size_t chan, bool *overrun);
 	void update_stream_stats_tx(size_t chan, bool *underrun);
 	bool do_clock_src_freq(enum ReferenceType ref, double freq);
-	/** sets the transmit chan gain, returns the gain setting **/
-	double setTxGain(double dB, size_t chan = 0);
-
-	/** get transmit gain */
-	double getTxGain(size_t chan = 0) {
-		return tx_gains[chan];
-	}
+	void get_dev_band_desc(dev_band_desc& desc);
 
-	/** return maximum Tx Gain **/
-	double maxTxGain(void);
-
-	/** return minimum Rx Gain **/
-	double minTxGain(void);
+	double setTxGain(double db, size_t chan) {OSMO_ASSERT(false); return 0.0f; }
+	double getTxGain(size_t chan = 0) { OSMO_ASSERT(false); return 0.0f; };
+	double maxTxGain(void) { OSMO_ASSERT(false); return 0.0f; };
 
 public:
 
@@ -178,6 +177,10 @@ public:
 	/** return minimum Rx Gain **/
 	double minRxGain(void);
 
+
+	double setPowerAttenuation(int atten, size_t chan);
+	double getPowerAttenuation(size_t chan = 0);
+
 	int getNominalTxPower(size_t chan = 0);
 
 	/** sets the RX path to use, returns true if successful and false otherwise */