OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[media] rtl2830: implement DVBv5 signal strength statistics 

Estimate signal strength from IF 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 2014-12-09 08:49:44 -03:00 committed by Mauro Carvalho Chehab
parent 47b4dbfff1
commit 871f70252b
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/media/dvb-frontends/rtl2830.c
View File

@ -246,6 +246,8 @@ static int rtl2830_init(struct dvb_frontend *fe)
goto err;
/* 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;
/* start statistics polling */
@ -693,6 +695,28 @@ static void rtl2830_stat_work(struct work_struct *work)
dev_dbg(&client->dev, "\n");
/* signal strength */
if (dev->fe_status & FE_HAS_SIGNAL) {
struct {signed int x:14; } s;
/* read IF AGC */
ret = rtl2830_rd_regs(client, 0x359, buf, 2);
if (ret)
goto err;
u16tmp = buf[0] << 8 | buf[1] << 0;
u16tmp &= 0x3fff; /* [13:0] */
tmp = s.x = u16tmp; /* 14-bit bin to 2 complement */
u16tmp = clamp_val(-4 * tmp + 32767, 0x0000, 0xffff);
dev_dbg(&client->dev, "IF AGC=%d\n", tmp);
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;