Estimate signal strength from IF AGC.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
drivers/media/dvb-frontends/rtl2830.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/media/dvb-frontends/rtl2830.c
b/drivers/media/dvb-frontends/rtl2830.c
index c484634..641047b 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;
--
http://palosaari.fi/
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