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Commit 006fe8ee authored by Daniel Scheller's avatar Daniel Scheller Committed by Mauro Carvalho Chehab
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media: dvb-frontends/stv0367: DVB-C signal strength statistics 



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: default avatarDaniel Scheller <d.scheller@gmx.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 87b46710

drivers/media/dvb-frontends/stv0367.c

+21 −0
Original line number Diff line number Diff line
@@ -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);