[PATCH v2 4/4] [media] dvb-frontends/stv0367: DVB-C signal strength statistics

[Daniel Scheller <d.scheller.oss@gmail.com>]

From: Daniel Scheller <d.scheller@gmx.net>

Provide QAM/DVB-C signal strength in decibel scale. Values returned from
stv0367cab_get_rf_lvl() are good but need to be multiplied as they're in
1dBm precision.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
---
 drivers/media/dvb-frontends/stv0367.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/media/dvb-frontends/stv0367.c b/drivers/media/dvb-frontends/stv0367.c
index d3be25bc1002..bac6707957a3 100644
--- a/drivers/media/dvb-frontends/stv0367.c
+++ b/drivers/media/dvb-frontends/stv0367.c
@@ -2998,6 +2998,25 @@ static int stv0367ddb_set_frontend(struct dvb_frontend *fe)
 	return -EINVAL;
 }
 
+static void stv0367ddb_read_signal_strength(struct dvb_frontend *fe)
+{
+	struct stv0367_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	s32 signalstrength;
+
+	switch (state->activedemod) {
+	case demod_cab:
+		signalstrength = stv0367cab_get_rf_lvl(state) * 1000;
+		break;
+	default:
+		p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		return;
+	}
+
+	p->strength.stat[0].scale = FE_SCALE_DECIBEL;
+	p->strength.stat[0].uvalue = signalstrength;
+}
+
 static void stv0367ddb_read_snr(struct dvb_frontend *fe)
 {
 	struct stv0367_state *state = fe->demodulator_priv;
@@ -3075,12 +3094,14 @@ static int stv0367ddb_read_status(struct dvb_frontend *fe,
 
 	/* stop if demod isn't locked */
 	if (!(*status & FE_HAS_LOCK)) {
+		p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
 		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
 		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
 		return ret;
 	}
 
 	stv0367ddb_read_snr(fe);
+	stv0367ddb_read_signal_strength(fe);
 	stv0367ddb_read_ucblocks(fe);
 
 	return 0;
-- 
2.13.0