From 25ef9f554713bc329523b615861db7cbc443106a Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Sun, 14 Dec 2014 11:00:50 -0300 Subject: [PATCH] [media] rtl2832: implement DVBv5 signal strength statistics Estimate signal strength from IF digital AGC. Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/rtl2832.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index 90d4f45..6aaaec2 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -474,6 +474,8 @@ static int rtl2832_init(struct dvb_frontend *fe) goto err; #endif /* 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; c->post_bit_error.len = 1; @@ -823,6 +825,24 @@ static void rtl2832_stat_work(struct work_struct *work) dev_dbg(&client->dev, "\n"); + /* signal strength */ + if (dev->fe_status & FE_HAS_SIGNAL) { + /* read digital AGC */ + ret = rtl2832_bulk_read(client, 0x305, &u8tmp, 1); + if (ret) + goto err; + + dev_dbg(&client->dev, "digital agc=%02x", u8tmp); + + u8tmp = ~u8tmp; + u16tmp = u8tmp << 8 | u8tmp << 0; + + 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; -- 2.7.4