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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: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Daniel Scheller 2017-06-25 08:26:45 -03:00 committed by Mauro Carvalho Chehab
parent 87b4671074
commit 006fe8ee88
1 changed files with 21 additions and 0 deletions
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21
drivers/media/dvb-frontends/stv0367.c
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@ -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);