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[media] rtl2830: implement .read_signal_strength()

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Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-05-18 15:17:51 -03:00 committed by Mauro Carvalho Chehab
parent 525ffc19b9
commit 78e750754b
1 changed files with 22 additions and 1 deletions
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23
drivers/media/dvb/frontends/rtl2830.c
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@ -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;