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Subject: media: dvb-frontends/stv0367: DVB-C signal strength statistics
Author: Daniel Scheller <d.schel...@gmx.net>
Date: Sun Jun 25 08:26:45 2017 -0300
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.schel...@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
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 1983c87d7d22..fab94341c22b 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;
@@ -3075,6 +3094,8 @@ static int stv0367ddb_read_status(struct dvb_frontend *fe,
if (ret)
return ret;
+ stv0367ddb_read_signal_strength(fe);
+
/* read carrier/noise when a carrier is detected */
if (*status & FE_HAS_CARRIER)
stv0367ddb_read_snr(fe);
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