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authorAntti Palosaari <crope@iki.fi>2012-05-18 15:17:51 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-05-20 10:24:12 -0300
commit78e750754bf0cc86d36149536bc7f3382710a2ee (patch)
treeef21dffd397bde6a0277d0e0d4757c5cefd5f0c9 /drivers/media
parent525ffc19b992f5d6a25413c36ba543a82585ed89 (diff)
[media] rtl2830: implement .read_signal_strength()
Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb/frontends/rtl2830.c23
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;