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

drivers/media/dvb-frontends/stv0367.c

+39 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#include <linux/slab.h>

#include <linux/i2c.h>



#include "dvb_math.h"



#include "stv0367.h"

#include "stv0367_defs.h"

#include "stv0367_regs.h"
@@ -2996,6 +2998,37 @@ static int stv0367ddb_set_frontend(struct dvb_frontend *fe) 
	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)

{

	struct stv0367_state *state = fe->demodulator_priv;
@@ -3040,6 +3073,12 @@ static int stv0367ddb_read_status(struct dvb_frontend *fe, 
	if (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 */

	if (!(*status & FE_HAS_LOCK)) {

		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;