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[media] af9033: fix DVBv3 signal strength value not correct issue 

Register 0x800048 is not dB measure but relative scale. Fix it and conform to NorDig specifications.

Signed-off-by: Bimow Chen <Bimow.Chen@ite.com.tw>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Bimow Chen 2014-10-01 07:28:54 -03:00 committed by Mauro Carvalho Chehab
parent 45c3cbb184
commit 3adec27242
2 changed files with 41 additions and 8 deletions
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43
drivers/media/dvb-frontends/af9033.c
View File

@ -862,17 +862,44 @@ static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr)
static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
struct af9033_dev *dev = fe->demodulator_priv;
int ret;
u8 strength2;
struct dtv_frontend_properties *c = &dev->fe.dtv_property_cache;
int ret, tmp, power_real;
u8 u8tmp, gain_offset, buf[7];
/* read signal strength of 0-100 scale */
ret = af9033_rd_reg(dev, 0x800048, &strength2);
if (ret < 0)
if (dev->is_af9035) {
ret = af9033_rd_reg(dev, 0x80004a, &u8tmp);
/* scale value to 0x0000-0xffff */
*strength = u8tmp * 0xffff / 100;
} else {
ret = af9033_rd_reg(dev, 0x8000f7, &u8tmp);
ret |= af9033_rd_regs(dev, 0x80f900, buf, 7);
if (c->frequency <= 300000000)
gain_offset = 7; /* VHF */
else
gain_offset = 4; /* UHF */
power_real = (u8tmp - 100 - gain_offset) -
power_reference[((buf[3] >> 0) & 3)][((buf[6] >> 0) & 7)];
if (power_real < -15)
tmp = 0;
else if ((power_real >= -15) && (power_real < 0))
tmp = (2 * (power_real + 15)) / 3;
else if ((power_real >= 0) && (power_real < 20))
tmp = 4 * power_real + 10;
else if ((power_real >= 20) && (power_real < 35))
tmp = (2 * (power_real - 20)) / 3 + 90;
else
tmp = 100;
/* scale value to 0x0000-0xffff */
*strength = tmp * 0xffff / 100;
}
if (ret)
goto err;
/* scale value to 0x0000-0xffff */
*strength = strength2 * 0xffff / 100;
return 0;
err:

6
drivers/media/dvb-frontends/af9033_priv.h
View File

@ -2051,4 +2051,10 @@ static const struct reg_val tuner_init_it9135_62[] = {
{ 0x80fd8b, 0x00 },
};
/* NorDig power reference table */
static const int power_reference[][5] = {
{-93, -91, -90, -89, -88}, /* QPSK 1/2 ~ 7/8 */
{-87, -85, -84, -83, -82}, /* 16QAM 1/2 ~ 7/8 */
{-82, -80, -78, -77, -76}, /* 64QAM 1/2 ~ 7/8 */
};
#endif /* AF9033_PRIV_H */