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[media] m88ds3103: implement DVBv5 CNR statistics 

Implement DVBv5 CNR statistics.
Wrap legacy DVBv3 SNR to DVBv5 CNR.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2015-04-13 20:56:13 -03:00 committed by Mauro Carvalho Chehab
parent 9240c384f1
commit c1daf6511a
1 changed files with 82 additions and 72 deletions
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150
drivers/media/dvb-frontends/m88ds3103.c
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@ -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));
if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL)
*snr = div_s64(c->cnr.stat[0].svalue, 100);
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;
}
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)