diff options
Diffstat (limited to 'drivers/media/dvb-frontends/mn88472.c')
| -rw-r--r-- | drivers/media/dvb-frontends/mn88472.c | 90 |
1 files changed, 87 insertions, 3 deletions
diff --git a/drivers/media/dvb-frontends/mn88472.c b/drivers/media/dvb-frontends/mn88472.c index 25dd7429a891..c7e5f6302dc6 100644 --- a/drivers/media/dvb-frontends/mn88472.c +++ b/drivers/media/dvb-frontends/mn88472.c @@ -28,9 +28,9 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status) struct i2c_client *client = fe->demodulator_priv; struct mn88472_dev *dev = i2c_get_clientdata(client); struct dtv_frontend_properties *c = &fe->dtv_property_cache; - int ret, i; - unsigned int utmp, utmp1; - u8 buf[2]; + int ret, i, stmp; + unsigned int utmp, utmp1, utmp2; + u8 buf[5]; if (!dev->active) { ret = -EAGAIN; @@ -96,6 +96,89 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status) c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE; } + /* CNR */ + if (*status & FE_HAS_VITERBI && c->delivery_system == SYS_DVBT) { + /* DVB-T CNR */ + ret = regmap_bulk_read(dev->regmap[0], 0x9c, buf, 2); + if (ret) + goto err; + + utmp = buf[0] << 8 | buf[1] << 0; + if (utmp) { + /* CNR[dB]: 10 * log10(65536 / value) + 2 */ + /* log10(65536) = 80807124, 0.2 = 3355443 */ + stmp = ((u64)80807124 - intlog10(utmp) + 3355443) + * 10000 >> 24; + + dev_dbg(&client->dev, "cnr=%d value=%u\n", stmp, utmp); + } else { + stmp = 0; + } + + c->cnr.stat[0].svalue = stmp; + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + } else if (*status & FE_HAS_VITERBI && + c->delivery_system == SYS_DVBT2) { + /* DVB-T2 CNR */ + for (i = 0; i < 3; i++) { + ret = regmap_bulk_read(dev->regmap[2], 0xbc + i, + &buf[i], 1); + if (ret) + goto err; + } + + utmp = buf[1] << 8 | buf[2] << 0; + utmp1 = (buf[0] >> 2) & 0x01; /* 0=SISO, 1=MISO */ + if (utmp) { + if (utmp1) { + /* CNR[dB]: 10 * log10(16384 / value) - 6 */ + /* log10(16384) = 70706234, 0.6 = 10066330 */ + stmp = ((u64)70706234 - intlog10(utmp) + - 10066330) * 10000 >> 24; + dev_dbg(&client->dev, "cnr=%d value=%u MISO\n", + stmp, utmp); + } else { + /* CNR[dB]: 10 * log10(65536 / value) + 2 */ + /* log10(65536) = 80807124, 0.2 = 3355443 */ + stmp = ((u64)80807124 - intlog10(utmp) + + 3355443) * 10000 >> 24; + + dev_dbg(&client->dev, "cnr=%d value=%u SISO\n", + stmp, utmp); + } + } else { + stmp = 0; + } + + c->cnr.stat[0].svalue = stmp; + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + } else if (*status & FE_HAS_VITERBI && + c->delivery_system == SYS_DVBC_ANNEX_A) { + /* DVB-C CNR */ + ret = regmap_bulk_read(dev->regmap[1], 0xa1, buf, 4); + if (ret) + goto err; + + utmp1 = buf[0] << 8 | buf[1] << 0; /* signal */ + utmp2 = buf[2] << 8 | buf[3] << 0; /* noise */ + if (utmp1 && utmp2) { + /* CNR[dB]: 10 * log10(8 * (signal / noise)) */ + /* log10(8) = 15151336 */ + stmp = ((u64)15151336 + intlog10(utmp1) + - intlog10(utmp2)) * 10000 >> 24; + + dev_dbg(&client->dev, "cnr=%d signal=%u noise=%u\n", + stmp, utmp1, utmp2); + } else { + stmp = 0; + } + + c->cnr.stat[0].svalue = stmp; + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + } else { + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + return 0; err: dev_dbg(&client->dev, "failed=%d\n", ret); @@ -570,6 +653,7 @@ static int mn88472_probe(struct i2c_client *client, /* Init stats to indicate which stats are supported */ c = &dev->fe.dtv_property_cache; c->strength.len = 1; + c->cnr.len = 1; /* Setup callbacks */ pdata->get_dvb_frontend = mn88472_get_dvb_frontend; |