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[media] rtl2832: wrap DVBv5 CNR to DVBv3 SNR

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Change legacy DVBv3 read SNR to return values calculated by DVBv5
statistics.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-14 10:05:49 -03:00 committed by Mauro Carvalho Chehab
parent 6b4fd01804
commit f7caf93fb8
2 changed files with 5 additions and 38 deletions
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42
drivers/media/dvb-frontends/rtl2832.c
View file

@ -791,49 +791,15 @@ err:
static int rtl2832_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct rtl2832_dev *dev = fe->demodulator_priv;
struct i2c_client *client = dev->client;
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] = {
{ 85387325, 85387325, 85387325, 85387325 },
{ 86676178, 86676178, 87167949, 87795660 },
{ 87659938, 87659938, 87885178, 88241743 },
};
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
/* reports SNR in resolution of 0.1 dB */
ret = rtl2832_rd_reg(dev, 0x3c, 3, &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 = rtl2832_rd_regs(dev, 0x0c, 4, buf, 2);
if (ret)
goto err;
tmp16 = buf[0] << 8 | buf[1];
if (tmp16)
*snr = (snr_constant[constellation][hierarchy] -
intlog10(tmp16)) / ((1 << 24) / 100);
/* report SNR in resolution of 0.1 dB */
if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL)
*snr = div_s64(c->cnr.stat[0].svalue, 100);
else
*snr = 0;
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static int rtl2832_read_ber(struct dvb_frontend *fe, u32 *ber)

1
drivers/media/dvb-frontends/rtl2832_priv.h
View file

@ -25,6 +25,7 @@
#include "rtl2832.h"
#include <linux/i2c-mux.h>
#include <linux/regmap.h>
#include <linux/math64.h>
struct rtl2832_dev {
struct rtl2832_platform_data *pdata;