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Commit eba672a0 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] rtl2830: implement .read_snr() 



Reports value as a 0.1 dB.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent f6f379df

drivers/media/dvb/frontends/rtl2830.c

+41 −1
Original line number Original line Diff line number Diff line
@@ -404,8 +404,48 @@ err: 




static int rtl2830_read_snr(struct dvb_frontend *fe, u16 *snr)

static int rtl2830_read_snr(struct dvb_frontend *fe, u16 *snr)

{

{

	struct rtl2830_priv *priv = fe->demodulator_priv;

	int ret, hierarchy, constellation;

	u8 buf[2], tmp;

	u16 tmp16;

#define CONSTELLATION_NUM 3

#define HIERARCHY_NUM 4

	static const u32 snr_constant[CONSTELLATION_NUM][HIERARCHY_NUM] = {

		{ 70705899, 70705899, 70705899, 70705899 },

		{ 82433173, 82433173, 87483115, 94445660 },

		{ 92888734, 92888734, 95487525, 99770748 },

	};



	/* reports SNR in resolution of 0.1 dB */



	ret = rtl2830_rd_reg(priv, 0x33c, &tmp);

	if (ret)

		goto err;



	constellation = (tmp >> 2) & 0x03; /* [3:2] */

	if (constellation > CONSTELLATION_NUM - 1)

		goto err;



	hierarchy = (tmp >> 4) & 0x07; /* [6:4] */

	if (hierarchy > HIERARCHY_NUM - 1)

		goto err;



	ret = rtl2830_rd_regs(priv, 0x40c, buf, 2);

	if (ret)

		goto err;



	tmp16 = buf[0] << 8 | buf[1];



	if (tmp16)

		*snr = (snr_constant[constellation][hierarchy] -

				intlog10(tmp16)) / ((1 << 24) / 100);

	else

		*snr = 0;

		*snr = 0;



	return 0;

	return 0;

err:

	dbg("%s: failed=%d", __func__, ret);

	return ret;

}

}





static int rtl2830_read_ber(struct dvb_frontend *fe, u32 *ber)

static int rtl2830_read_ber(struct dvb_frontend *fe, u32 *ber)

drivers/media/dvb/frontends/rtl2830_priv.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -22,6 +22,7 @@ 
#define RTL2830_PRIV_H

#define RTL2830_PRIV_H





#include "dvb_frontend.h"

#include "dvb_frontend.h"

#include "dvb_math.h"

#include "rtl2830.h"

#include "rtl2830.h"





#define LOG_PREFIX "rtl2830"

#define LOG_PREFIX "rtl2830"