Implement DVBv5 BER.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/dvb-frontends/si2168.c | 46 +++++++++++++++++++++++++++++--
drivers/media/dvb-frontends/si2168_priv.h | 1 +
2 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c
index 20b4a65..5fbb6c1 100644
--- a/drivers/media/dvb-frontends/si2168.c
+++ b/drivers/media/dvb-frontends/si2168.c
@@ -85,7 +85,8 @@ static int si2168_read_status(struct dvb_frontend *fe, enum fe_status *status)
struct i2c_client *client = fe->demodulator_priv;
struct si2168_dev *dev = i2c_get_clientdata(client);
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- int ret;
+ int ret, i;
+ unsigned int utmp, utmp1, utmp2;
struct si2168_cmd cmd;
*status = 0;
@@ -144,6 +145,39 @@ static int si2168_read_status(struct dvb_frontend *fe, enum fe_status *status)
dev_dbg(&client->dev, "status=%02x args=%*ph\n",
*status, cmd.rlen, cmd.args);
+ /* BER */
+ if (*status & FE_HAS_VITERBI) {
+ memcpy(cmd.args, "\x82\x00", 2);
+ cmd.wlen = 2;
+ cmd.rlen = 3;
+ ret = si2168_cmd_execute(client, &cmd);
+ if (ret)
+ goto err;
+
+ /*
+ * Firmware returns [0, 255] mantissa and [0, 8] exponent.
+ * Convert to DVB API: mantissa * 10^(8 - exponent) / 10^8
+ */
+ utmp = clamp(8 - cmd.args[1], 0, 8);
+ for (i = 0, utmp1 = 1; i < utmp; i++)
+ utmp1 = utmp1 * 10;
+
+ utmp1 = cmd.args[2] * utmp1;
+ utmp2 = 100000000; /* 10^8 */
+
+ dev_dbg(&client->dev,
+ "post_bit_error=%u post_bit_count=%u ber=%u*10^-%u\n",
+ utmp1, utmp2, cmd.args[2], cmd.args[1]);
+
+ c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_error.stat[0].uvalue += utmp1;
+ c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_count.stat[0].uvalue += utmp2;
+ } else {
+ c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ }
+
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
@@ -355,6 +389,7 @@ static int si2168_init(struct dvb_frontend *fe)
{
struct i2c_client *client = fe->demodulator_priv;
struct si2168_dev *dev = i2c_get_clientdata(client);
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, len, remaining;
const struct firmware *fw;
struct si2168_cmd cmd;
@@ -493,10 +528,17 @@ static int si2168_init(struct dvb_frontend *fe)
dev->warm = true;
warm:
+ /* Init stats here to indicate which stats are supported */
+ c->cnr.len = 1;
+ c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_error.len = 1;
+ c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.len = 1;
+ c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
dev->active = true;
return 0;
-
err_release_firmware:
release_firmware(fw);
err:
diff --git a/drivers/media/dvb-frontends/si2168_priv.h b/drivers/media/dvb-frontends/si2168_priv.h
index 7843ccb..2fecac6 100644
--- a/drivers/media/dvb-frontends/si2168_priv.h
+++ b/drivers/media/dvb-frontends/si2168_priv.h
@@ -21,6 +21,7 @@
#include "dvb_frontend.h"
#include <linux/firmware.h>
#include <linux/i2c-mux.h>
+#include <linux/kernel.h>
#define SI2168_A20_FIRMWARE "dvb-demod-si2168-a20-01.fw"
#define SI2168_A30_FIRMWARE "dvb-demod-si2168-a30-01.fw"
--
http://palosaari.fi/
--
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