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[media] af9033: wrap DVBv3 read SNR to DVBv5 CNR

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Remove 'duplicate' DVBv3 read SNR implementation and return value,
calculated already by DVBv5 CNR, from the cache.

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 2014-09-02 05:03:21 -03:00 • committed by Mauro Carvalho Chehab
parent 3e41313aea
commit 6b45778609
2 changed files with 7 additions and 46 deletions
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52
drivers/media/dvb-frontends/af9033.c
View file

@ -832,55 +832,15 @@ err:
static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr) static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr)
{ {
struct af9033_dev *dev = fe->demodulator_priv; struct af9033_dev *dev = fe->demodulator_priv;
int ret, i, len; struct dtv_frontend_properties *c = &dev->fe.dtv_property_cache;
u8 buf[3], tmp;
u32 snr_val;
const struct val_snr *snr_lut;
/* read value */ /* use DVBv5 CNR */
ret = af9033_rd_regs(dev, 0x80002c, buf, 3); if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL)
if (ret < 0) *snr = div_s64(c->cnr.stat[0].svalue, 100); /* 1000x => 10x */
goto err; else
*snr = 0;
snr_val = (buf[2] << 16) | (buf[1] << 8) | buf[0];
/* read current modulation */
ret = af9033_rd_reg(dev, 0x80f903, &tmp);
if (ret < 0)
goto err;
switch ((tmp >> 0) & 3) {
case 0:
len = ARRAY_SIZE(qpsk_snr_lut);
snr_lut = qpsk_snr_lut;
break;
case 1:
len = ARRAY_SIZE(qam16_snr_lut);
snr_lut = qam16_snr_lut;
break;
case 2:
len = ARRAY_SIZE(qam64_snr_lut);
snr_lut = qam64_snr_lut;
break;
default:
goto err;
}
for (i = 0; i < len; i++) {
tmp = snr_lut[i].snr;
if (snr_val < snr_lut[i].val)
break;
}
*snr = tmp * 10; /* dB/10 */
return 0; return 0;
err:
dev_dbg(&dev->client->dev, "failed=%d\n", ret);
return ret;
} }
static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength) static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)

1
drivers/media/dvb-frontends/af9033_priv.h
View file

@ -24,6 +24,7 @@
#include "dvb_frontend.h" #include "dvb_frontend.h"
#include "af9033.h" #include "af9033.h"
#include <linux/math64.h>
struct reg_val { struct reg_val {
u32 reg; u32 reg;