From: Antti Palosaari Date: Mon, 13 Apr 2015 23:56:13 +0000 (-0300) Subject: [media] m88ds3103: implement DVBv5 CNR statistics X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c1daf6511a5ddd9c6f4855978bb9345beef90937;p=linux-beck.git [media] m88ds3103: implement DVBv5 CNR statistics Implement DVBv5 CNR statistics. Wrap legacy DVBv3 SNR to DVBv5 CNR. Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 03dceb50863f..381a8ad173b5 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -190,8 +190,9 @@ static int m88ds3103_read_status(struct dvb_frontend *fe, fe_status_t *status) { struct m88ds3103_priv *priv = fe->demodulator_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; - int ret; + int ret, i, itmp; u8 u8tmp; + u8 buf[3]; *status = 0; @@ -233,6 +234,77 @@ static int m88ds3103_read_status(struct dvb_frontend *fe, fe_status_t *status) dev_dbg(&priv->i2c->dev, "%s: lock=%02x status=%02x\n", __func__, u8tmp, *status); + /* CNR */ + if (priv->fe_status & FE_HAS_VITERBI) { + unsigned int cnr, noise, signal, noise_tot, signal_tot; + + cnr = 0; + /* more iterations for more accurate estimation */ + #define M88DS3103_SNR_ITERATIONS 3 + + switch (c->delivery_system) { + case SYS_DVBS: + itmp = 0; + + for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { + ret = m88ds3103_rd_reg(priv, 0xff, &buf[0]); + if (ret) + goto err; + + itmp += buf[0]; + } + + /* use of single register limits max value to 15 dB */ + /* SNR(X) dB = 10 * ln(X) / ln(10) dB */ + itmp = DIV_ROUND_CLOSEST(itmp, 8 * M88DS3103_SNR_ITERATIONS); + if (itmp) + cnr = div_u64((u64) 10000 * intlog2(itmp), intlog2(10)); + break; + case SYS_DVBS2: + noise_tot = 0; + signal_tot = 0; + + for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { + ret = m88ds3103_rd_regs(priv, 0x8c, buf, 3); + if (ret) + goto err; + + noise = buf[1] << 6; /* [13:6] */ + noise |= buf[0] & 0x3f; /* [5:0] */ + noise >>= 2; + signal = buf[2] * buf[2]; + signal >>= 1; + + noise_tot += noise; + signal_tot += signal; + } + + noise = noise_tot / M88DS3103_SNR_ITERATIONS; + signal = signal_tot / M88DS3103_SNR_ITERATIONS; + + /* SNR(X) dB = 10 * log10(X) dB */ + if (signal > noise) { + itmp = signal / noise; + cnr = div_u64((u64) 10000 * intlog10(itmp), (1 << 24)); + } + break; + default: + dev_dbg(&priv->i2c->dev, + "%s: invalid delivery_system\n", __func__); + ret = -EINVAL; + goto err; + } + + if (cnr) { + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + c->cnr.stat[0].svalue = cnr; + } else { + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + } else { + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + return 0; err: dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret); @@ -577,6 +649,7 @@ err: static int m88ds3103_init(struct dvb_frontend *fe) { struct m88ds3103_priv *priv = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; int ret, len, remaining; const struct firmware *fw = NULL; u8 *fw_file; @@ -684,7 +757,9 @@ static int m88ds3103_init(struct dvb_frontend *fe) skip_fw_download: /* warm state */ priv->warm = true; - + /* init stats here in order signal app which stats are supported */ + c->cnr.len = 1; + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; return 0; error_fw_release: @@ -702,6 +777,7 @@ static int m88ds3103_sleep(struct dvb_frontend *fe) dev_dbg(&priv->i2c->dev, "%s:\n", __func__); + priv->fe_status = 0; priv->delivery_system = SYS_UNDEFINED; /* TS Hi-Z */ @@ -908,80 +984,14 @@ err: static int m88ds3103_read_snr(struct dvb_frontend *fe, u16 *snr) { - struct m88ds3103_priv *priv = fe->demodulator_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; - int ret, i, tmp; - u8 buf[3]; - u16 noise, signal; - u32 noise_tot, signal_tot; - dev_dbg(&priv->i2c->dev, "%s:\n", __func__); - /* reports SNR in resolution of 0.1 dB */ - - /* more iterations for more accurate estimation */ - #define M88DS3103_SNR_ITERATIONS 3 - - switch (c->delivery_system) { - case SYS_DVBS: - tmp = 0; - - for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { - ret = m88ds3103_rd_reg(priv, 0xff, &buf[0]); - if (ret) - goto err; - - tmp += buf[0]; - } - - /* use of one register limits max value to 15 dB */ - /* SNR(X) dB = 10 * ln(X) / ln(10) dB */ - tmp = DIV_ROUND_CLOSEST(tmp, 8 * M88DS3103_SNR_ITERATIONS); - if (tmp) - *snr = div_u64((u64) 100 * intlog2(tmp), intlog2(10)); - else - *snr = 0; - break; - case SYS_DVBS2: - noise_tot = 0; - signal_tot = 0; - - for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { - ret = m88ds3103_rd_regs(priv, 0x8c, buf, 3); - if (ret) - goto err; - - noise = buf[1] << 6; /* [13:6] */ - noise |= buf[0] & 0x3f; /* [5:0] */ - noise >>= 2; - signal = buf[2] * buf[2]; - signal >>= 1; - - noise_tot += noise; - signal_tot += signal; - } - - noise = noise_tot / M88DS3103_SNR_ITERATIONS; - signal = signal_tot / M88DS3103_SNR_ITERATIONS; - - /* SNR(X) dB = 10 * log10(X) dB */ - if (signal > noise) { - tmp = signal / noise; - *snr = div_u64((u64) 100 * intlog10(tmp), (1 << 24)); - } else { - *snr = 0; - } - break; - default: - dev_dbg(&priv->i2c->dev, "%s: invalid delivery_system\n", - __func__); - ret = -EINVAL; - goto err; - } + if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL) + *snr = div_s64(c->cnr.stat[0].svalue, 100); + else + *snr = 0; return 0; -err: - dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret); - return ret; } static int m88ds3103_read_ber(struct dvb_frontend *fe, u32 *ber)