Estimate signal strength from IF digital AGC.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
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 531099b..39c8f34 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;
--
http://palosaari.fi/
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