redonkable/alistair23-linux
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media: af9013: dvbv5 cnr

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Implement dvbv5 cnr.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2017-06-18 06:23:15 -04:00 committed by Mauro Carvalho Chehab
parent 943a720f5c
commit f3bb7e22b1
2 changed files with 84 additions and 5 deletions
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88
drivers/media/dvb-frontends/af9013.c
View file

@ -46,6 +46,7 @@ struct af9013_state {
unsigned long set_frontend_jiffies;
unsigned long read_status_jiffies;
unsigned long strength_jiffies;
unsigned long cnr_jiffies;
bool first_tune;
bool i2c_gate_state;
unsigned int statistics_step:3;
@ -179,7 +180,6 @@ static int af9013_statistics_snr_result(struct dvb_frontend *fe)
{
struct af9013_state *state = fe->demodulator_priv;
struct i2c_client *client = state->client;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, i, len;
unsigned int utmp;
u8 buf[3];
@ -235,9 +235,6 @@ static int af9013_statistics_snr_result(struct dvb_frontend *fe)
}
state->snr = utmp * 10; /* dB/10 */
c->cnr.stat[0].svalue = 1000 * utmp;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
return 0;
err:
dev_dbg(&client->dev, "failed %d\n", ret);
@ -757,7 +754,7 @@ static int af9013_read_status(struct dvb_frontend *fe, enum fe_status *status)
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, stmp1;
unsigned int utmp, utmp1, utmp2, utmp3, utmp4;
u8 buf[2];
u8 buf[3];
dev_dbg(&client->dev, "\n");
@ -869,6 +866,87 @@ static int af9013_read_status(struct dvb_frontend *fe, enum fe_status *status)
break;
}
/* CNR */
switch (state->fe_status & FE_HAS_VITERBI) {
case FE_HAS_VITERBI:
if (time_is_after_jiffies(state->cnr_jiffies + msecs_to_jiffies(2000)))
break;
/* Check if cnr ready */
ret = regmap_read(state->regmap, 0xd2e1, &utmp);
if (ret)
goto err;
if (!((utmp >> 3) & 0x01)) {
dev_dbg(&client->dev, "cnr not ready\n");
break;
}
/* Read value */
ret = regmap_bulk_read(state->regmap, 0xd2e3, buf, 3);
if (ret)
goto err;
utmp1 = buf[2] << 16 | buf[1] << 8 | buf[0] << 0;
/* Read current modulation */
ret = regmap_read(state->regmap, 0xd3c1, &utmp);
if (ret)
goto err;
switch ((utmp >> 6) & 3) {
case 0:
/*
* QPSK
* CNR[dB] 13 * -log10((1690000 - value) / value) + 2.6
* value [653799, 1689999], 2.6 / 13 = 3355443
*/
utmp1 = clamp(utmp1, 653799U, 1689999U);
utmp1 = ((u64)(intlog10(utmp1)
- intlog10(1690000 - utmp1)
+ 3355443) * 13 * 1000) >> 24;
break;
case 1:
/*
* QAM-16
* CNR[dB] 6 * log10((value - 370000) / (828000 - value)) + 15.7
* value [371105, 827999], 15.7 / 6 = 43900382
*/
utmp1 = clamp(utmp1, 371105U, 827999U);
utmp1 = ((u64)(intlog10(utmp1 - 370000)
- intlog10(828000 - utmp1)
+ 43900382) * 6 * 1000) >> 24;
break;
case 2:
/*
* QAM-64
* CNR[dB] 8 * log10((value - 193000) / (425000 - value)) + 23.8
* value [193246, 424999], 23.8 / 8 = 49912218
*/
utmp1 = clamp(utmp1, 193246U, 424999U);
utmp1 = ((u64)(intlog10(utmp1 - 193000)
- intlog10(425000 - utmp1)
+ 49912218) * 8 * 1000) >> 24;
break;
default:
dev_dbg(&client->dev, "invalid modulation %u\n",
(utmp >> 6) & 3);
utmp1 = 0;
break;
}
dev_dbg(&client->dev, "cnr %u\n", utmp1);
state->cnr_jiffies = jiffies;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
c->cnr.stat[0].svalue = utmp1;
break;
default:
c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
break;
}
return 0;
err:
dev_dbg(&client->dev, "failed %d\n", ret);

1
drivers/media/dvb-frontends/af9013_priv.h
View file

@ -22,6 +22,7 @@
#define AF9013_PRIV_H
#include <media/dvb_frontend.h>
#include <media/dvb_math.h>
#include "af9013.h"
#include <linux/firmware.h>
#include <linux/math64.h>