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Commit 8393c003 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] si2168: implement ber statistics 



Implement DVBv5 BER.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent e5360224

drivers/media/dvb-frontends/si2168.c

+44 −2
Original line number Diff line number Diff line
@@ -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:

drivers/media/dvb-frontends/si2168_priv.h

+1 −0
Original line number Diff line number Diff line
@@ -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"