From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wr0-f194.google.com ([209.85.128.194]:36532 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751133AbdFTRpO (ORCPT ); Tue, 20 Jun 2017 13:45:14 -0400 Received: by mail-wr0-f194.google.com with SMTP id 77so19155794wrb.3 for ; Tue, 20 Jun 2017 10:45:14 -0700 (PDT) From: Daniel Scheller To: linux-media@vger.kernel.org, mchehab@kernel.org, mchehab@s-opensource.com Cc: liplianin@netup.ru, rjkm@metzlerbros.de Subject: [PATCH 3/4] [media] dvb-frontends/stv0367: SNR DVBv5 statistics for DVB-C and T Date: Tue, 20 Jun 2017 19:45:05 +0200 Message-Id: <20170620174506.7593-4-d.scheller.oss@gmail.com> In-Reply-To: <20170620174506.7593-1-d.scheller.oss@gmail.com> References: <20170620174506.7593-1-d.scheller.oss@gmail.com> Sender: linux-media-owner@vger.kernel.org List-ID: From: Daniel Scheller 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: Daniel Scheller --- drivers/media/dvb-frontends/stv0367.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/media/dvb-frontends/stv0367.c b/drivers/media/dvb-frontends/stv0367.c index bb498f942ebd..0b13a407df23 100644 --- a/drivers/media/dvb-frontends/stv0367.c +++ b/drivers/media/dvb-frontends/stv0367.c @@ -25,6 +25,8 @@ #include #include +#include "dvb_math.h" + #include "stv0367.h" #include "stv0367_defs.h" #include "stv0367_regs.h" @@ -33,6 +35,9 @@ /* Max transfer size done by I2C transfer functions */ #define MAX_XFER_SIZE 64 +/* snr logarithmic calc */ +#define INTLOG10X100(x) ((u32) (((u64) intlog10(x) * 100) >> 24)) + static int stvdebug; module_param_named(debug, stvdebug, int, 0644); @@ -3013,6 +3018,33 @@ static int stv0367ddb_read_status(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); + + tmpval = (cab_pwr * 320) / regval; + snrval = ((tmpval != 0) ? INTLOG10X100(tmpval) : 0) * 100; + 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; @@ -3069,6 +3101,7 @@ static int stv0367ddb_get_frontend(struct dvb_frontend *fe, } stv0367ddb_read_ucblocks(fe); + stv0367ddb_read_snr(fe); return 0; } -- 2.13.0