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| author | Antti Palosaari <crope@iki.fi> | 2012-05-18 15:17:51 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-05-20 10:24:12 -0300 |
| commit | 78e750754bf0cc86d36149536bc7f3382710a2ee (patch) | |
| tree | ef21dffd397bde6a0277d0e0d4757c5cefd5f0c9 /drivers/media/dvb/frontends/rtl2830.c | |
| parent | 525ffc19b992f5d6a25413c36ba543a82585ed89 (diff) | |
| download | lwn-78e750754bf0cc86d36149536bc7f3382710a2ee.tar.gz lwn-78e750754bf0cc86d36149536bc7f3382710a2ee.zip | |
[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/dvb/frontends/rtl2830.c')
| -rw-r--r-- | drivers/media/dvb/frontends/rtl2830.c | 23 |
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; |