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| author |   Antti Palosaari <crope@iki.fi> | 2014-12-09 08:49:44 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-02-02 17:54:35 -0200 |
| commit | 871f70252b6fef738cda1834200d25e343ce4825 (patch) | |
| tree | dc106198c47a96c0b00e8484bc52fe4a6d3715f0 /drivers/media/dvb-frontends/rtl2830.c | |
| parent | [media] rtl2830: implement DVBv5 CNR statistic (diff) | |
| download | linux-dev-871f70252b6fef738cda1834200d25e343ce4825.tar.xz linux-dev-871f70252b6fef738cda1834200d25e343ce4825.zip | |
[media] rtl2830: implement DVBv5 signal strength statistics
Estimate signal strength from IF AGC.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/dvb-frontends/rtl2830.c')
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2830.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/rtl2830.c b/drivers/media/dvb-frontends/rtl2830.c index c484634a9fc9..641047b89e05 100644 --- a/drivers/media/dvb-frontends/rtl2830.c +++ b/drivers/media/dvb-frontends/rtl2830.c @@ -246,6 +246,8 @@ static int rtl2830_init(struct dvb_frontend *fe) goto err; /* init stats here in order signal app which stats are supported */ + c->strength.len = 1; + c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE; c->cnr.len = 1; c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; /* start statistics polling */ @@ -693,6 +695,28 @@ static void rtl2830_stat_work(struct work_struct *work) dev_dbg(&client->dev, "\n"); + /* signal strength */ + if (dev->fe_status & FE_HAS_SIGNAL) { + struct {signed int x:14; } s; + + /* read IF AGC */ + ret = rtl2830_rd_regs(client, 0x359, buf, 2); + if (ret) + goto err; + + u16tmp = buf[0] << 8 | buf[1] << 0; + u16tmp &= 0x3fff; /* [13:0] */ + tmp = s.x = u16tmp; /* 14-bit bin to 2 complement */ + u16tmp = clamp_val(-4 * tmp + 32767, 0x0000, 0xffff); + + dev_dbg(&client->dev, "IF AGC=%d\n", tmp); + + c->strength.stat[0].scale = FE_SCALE_RELATIVE; + c->strength.stat[0].uvalue = u16tmp; + } else { + c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + /* CNR */ if (dev->fe_status & FE_HAS_VITERBI) { unsigned hierarchy, constellation; |