[media] rtl2830: implement .read_signal_strength()

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/media/dvb/frontends/rtl2830.c b/drivers/media/dvb/frontends/rtl2830.c
index 266098656c48..6e4029de3c73 100644
--- a/drivers/media/dvb/frontends/rtl2830.c
+++ b/drivers/media/dvb/frontends/rtl2830.c
@@ -474,8 +474,29 @@ static int rtl2830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 
 static int rtl2830_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 {
-        *strength = 0;
+        struct rtl2830_priv *priv = fe->demodulator_priv;
+        int ret;
+        u8 buf[2];
+        u16 if_agc_raw, if_agc;
+
+        ret = rtl2830_rd_regs(priv, 0x359, buf, 2);
+        if (ret)
+                goto err;
+
+        if_agc_raw = (buf[0] << 8 | buf[1]) & 0x3fff;
+
+        if (if_agc_raw & (1 << 9))
+                if_agc = -(~(if_agc_raw - 1) & 0x1ff);
+        else
+                if_agc = if_agc_raw;
+
+        *strength = (u8) (55 - if_agc / 182);
+        *strength |= *strength << 8;
+
         return 0;
+err:
+        dbg("%s: failed=%d", __func__, ret);
+        return ret;
 }
 
 static struct dvb_frontend_ops rtl2830_ops;