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[media] rtl2832: implement DVBv5 signal strength statistics

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Estimate signal strength from IF digital AGC.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-14 11:00:50 -03:00 committed by Mauro Carvalho Chehab
parent 084330b746
commit 25ef9f5547
1 changed files with 20 additions and 0 deletions
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20
drivers/media/dvb-frontends/rtl2832.c
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@ -474,6 +474,8 @@ static int rtl2832_init(struct dvb_frontend *fe)
goto err;
#endif
/* 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;
c->post_bit_error.len = 1;
@ -823,6 +825,24 @@ static void rtl2832_stat_work(struct work_struct *work)
dev_dbg(&client->dev, "\n");
/* signal strength */
if (dev->fe_status & FE_HAS_SIGNAL) {
/* read digital AGC */
ret = rtl2832_bulk_read(client, 0x305, &u8tmp, 1);
if (ret)
goto err;
dev_dbg(&client->dev, "digital agc=%02x", u8tmp);
u8tmp = ~u8tmp;
u16tmp = u8tmp << 8 | u8tmp << 0;
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;