Commit d394ad12 authored by Daniel Scheller's avatar Daniel Scheller Committed by Mauro Carvalho Chehab

media: dvb-frontends/stv0367: SNR DVBv5 statistics for DVB-C and T

Add signal-to-noise-ratio as provided by the demodulator in decibel scale.
QAM/DVB-C needs some intlog calculation to have usable dB values, OFDM/
DVB-T values from the demod look alright already and are provided as-is.
Signed-off-by: default avatarDaniel Scheller <d.scheller@gmx.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 8982735f
...@@ -25,6 +25,8 @@ ...@@ -25,6 +25,8 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include "dvb_math.h"
#include "stv0367.h" #include "stv0367.h"
#include "stv0367_defs.h" #include "stv0367_defs.h"
#include "stv0367_regs.h" #include "stv0367_regs.h"
...@@ -2996,6 +2998,37 @@ static int stv0367ddb_set_frontend(struct dvb_frontend *fe) ...@@ -2996,6 +2998,37 @@ static int stv0367ddb_set_frontend(struct dvb_frontend *fe)
return -EINVAL; return -EINVAL;
} }
static void stv0367ddb_read_snr(struct dvb_frontend *fe)
{
struct stv0367_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
int cab_pwr;
u32 regval, tmpval, snrval = 0;
switch (state->activedemod) {
case demod_ter:
snrval = stv0367ter_snr_readreg(fe);
break;
case demod_cab:
cab_pwr = stv0367cab_snr_power(fe);
regval = stv0367cab_snr_readreg(fe, 0);
/* prevent division by zero */
if (!regval)
snrval = 0;
tmpval = (cab_pwr * 320) / regval;
snrval = ((tmpval != 0) ? (intlog2(tmpval) / 5581) : 0);
break;
default:
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
return;
}
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].uvalue = snrval;
}
static void stv0367ddb_read_ucblocks(struct dvb_frontend *fe) static void stv0367ddb_read_ucblocks(struct dvb_frontend *fe)
{ {
struct stv0367_state *state = fe->demodulator_priv; struct stv0367_state *state = fe->demodulator_priv;
...@@ -3040,6 +3073,12 @@ static int stv0367ddb_read_status(struct dvb_frontend *fe, ...@@ -3040,6 +3073,12 @@ static int stv0367ddb_read_status(struct dvb_frontend *fe,
if (ret) if (ret)
return ret; return ret;
/* read carrier/noise when a carrier is detected */
if (*status & FE_HAS_CARRIER)
stv0367ddb_read_snr(fe);
else
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
/* stop if demod isn't locked */ /* stop if demod isn't locked */
if (!(*status & FE_HAS_LOCK)) { if (!(*status & FE_HAS_LOCK)) {
p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE; p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
......
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