Implement DVBv5 CNR.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/dvb-frontends/mn88472.c | 90 +++++++++++++++++++++++++++++-
drivers/media/dvb-frontends/mn88472_priv.h | 1 +
2 files changed, 88 insertions(+), 3 deletions(-)
diff --git a/drivers/media/dvb-frontends/mn88472.c b/drivers/media/dvb-frontends/mn88472.c
index 25dd742..c7e5f63 100644
--- a/drivers/media/dvb-frontends/mn88472.c
+++ b/drivers/media/dvb-frontends/mn88472.c
@@ -28,9 +28,9 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status)
struct i2c_client *client = fe->demodulator_priv;
struct mn88472_dev *dev = i2c_get_clientdata(client);
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- int ret, i;
- unsigned int utmp, utmp1;
- u8 buf[2];
+ int ret, i, stmp;
+ unsigned int utmp, utmp1, utmp2;
+ u8 buf[5];
if (!dev->active) {
ret = -EAGAIN;
@@ -96,6 +96,89 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status)
c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
+ /* CNR */
+ if (*status & FE_HAS_VITERBI && c->delivery_system == SYS_DVBT) {
+ /* DVB-T CNR */
+ ret = regmap_bulk_read(dev->regmap[0], 0x9c, buf, 2);
+ if (ret)
+ goto err;
+
+ utmp = buf[0] << 8 | buf[1] << 0;
+ if (utmp) {
+ /* CNR[dB]: 10 * log10(65536 / value) + 2 */
+ /* log10(65536) = 80807124, 0.2 = 3355443 */
+ stmp = ((u64)80807124 - intlog10(utmp) + 3355443)
+ * 10000 >> 24;
+
+ dev_dbg(&client->dev, "cnr=%d value=%u\n", stmp, utmp);
+ } else {
+ stmp = 0;
+ }
+
+ c->cnr.stat[0].svalue = stmp;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ } else if (*status & FE_HAS_VITERBI &&
+ c->delivery_system == SYS_DVBT2) {
+ /* DVB-T2 CNR */
+ for (i = 0; i < 3; i++) {
+ ret = regmap_bulk_read(dev->regmap[2], 0xbc + i,
+ &buf[i], 1);
+ if (ret)
+ goto err;
+ }
+
+ utmp = buf[1] << 8 | buf[2] << 0;
+ utmp1 = (buf[0] >> 2) & 0x01; /* 0=SISO, 1=MISO */
+ if (utmp) {
+ if (utmp1) {
+ /* CNR[dB]: 10 * log10(16384 / value) - 6 */
+ /* log10(16384) = 70706234, 0.6 = 10066330 */
+ stmp = ((u64)70706234 - intlog10(utmp)
+ - 10066330) * 10000 >> 24;
+ dev_dbg(&client->dev, "cnr=%d value=%u MISO\n",
+ stmp, utmp);
+ } else {
+ /* CNR[dB]: 10 * log10(65536 / value) + 2 */
+ /* log10(65536) = 80807124, 0.2 = 3355443 */
+ stmp = ((u64)80807124 - intlog10(utmp)
+ + 3355443) * 10000 >> 24;
+
+ dev_dbg(&client->dev, "cnr=%d value=%u SISO\n",
+ stmp, utmp);
+ }
+ } else {
+ stmp = 0;
+ }
+
+ c->cnr.stat[0].svalue = stmp;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ } else if (*status & FE_HAS_VITERBI &&
+ c->delivery_system == SYS_DVBC_ANNEX_A) {
+ /* DVB-C CNR */
+ ret = regmap_bulk_read(dev->regmap[1], 0xa1, buf, 4);
+ if (ret)
+ goto err;
+
+ utmp1 = buf[0] << 8 | buf[1] << 0; /* signal */
+ utmp2 = buf[2] << 8 | buf[3] << 0; /* noise */
+ if (utmp1 && utmp2) {
+ /* CNR[dB]: 10 * log10(8 * (signal / noise)) */
+ /* log10(8) = 15151336 */
+ stmp = ((u64)15151336 + intlog10(utmp1)
+ - intlog10(utmp2)) * 10000 >> 24;
+
+ dev_dbg(&client->dev, "cnr=%d signal=%u noise=%u\n",
+ stmp, utmp1, utmp2);
+ } else {
+ stmp = 0;
+ }
+
+ c->cnr.stat[0].svalue = stmp;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ } else {
+ c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ }
+
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
@@ -570,6 +653,7 @@ static int mn88472_probe(struct i2c_client *client,
/* Init stats to indicate which stats are supported */
c = &dev->fe.dtv_property_cache;
c->strength.len = 1;
+ c->cnr.len = 1;
/* Setup callbacks */
pdata->get_dvb_frontend = mn88472_get_dvb_frontend;
diff --git a/drivers/media/dvb-frontends/mn88472_priv.h b/drivers/media/dvb-frontends/mn88472_priv.h
index cdf2597..fb50f56 100644
--- a/drivers/media/dvb-frontends/mn88472_priv.h
+++ b/drivers/media/dvb-frontends/mn88472_priv.h
@@ -18,6 +18,7 @@
#define MN88472_PRIV_H
#include "dvb_frontend.h"
+#include "dvb_math.h"
#include "mn88472.h"
#include <linux/firmware.h>
#include <linux/regmap.h>
--
http://palosaari.fi/
