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[media] cxd2841er: Reading SNR for DVB-C added 

Now driver returns correct values for DVB-C:
 SNR (in dB)

[mchehab@s-opensource.com: fix a new function to be static]
Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Abylay Ospan 2016-07-15 17:04:17 -03:00 committed by Mauro Carvalho Chehab
parent a6f330cbb3
commit e05b1872f2
1 changed files with 81 additions and 8 deletions
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89
drivers/media/dvb-frontends/cxd2841er.c
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@ -1570,7 +1570,8 @@ static int cxd2841er_read_ber_t(struct cxd2841er_priv *priv,
return 0;
}
static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv, u8 delsys)
static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv,
u8 delsys, u32 *snr)
{
u8 data[3];
u32 res = 0, value;
@ -1628,9 +1629,71 @@ static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv, u8 delsys)
} else {
dev_dbg(&priv->i2c->dev,
"%s(): no data available\n", __func__);
return -EINVAL;
}
done:
return res;
*snr = res;
return 0;
}
static uint32_t sony_log(uint32_t x)
{
return (((10000>>8)*(intlog2(x)>>16) + LOG2_E_100X/2)/LOG2_E_100X);
}
static int cxd2841er_read_snr_c(struct cxd2841er_priv *priv, u32 *snr)
{
u32 reg;
u8 data[2];
enum sony_dvbc_constellation_t qam = SONY_DVBC_CONSTELLATION_16QAM;
*snr = 0;
if (priv->state != STATE_ACTIVE_TC) {
dev_dbg(&priv->i2c->dev,
"%s(): invalid state %d\n",
__func__, priv->state);
return -EINVAL;
}
/*
* Freeze registers: ensure multiple separate register reads
* are from the same snapshot
*/
cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x01);
cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x40);
cxd2841er_read_regs(priv, I2C_SLVT, 0x19, data, 1);
qam = (enum sony_dvbc_constellation_t) (data[0] & 0x07);
cxd2841er_read_regs(priv, I2C_SLVT, 0x4C, data, 2);
reg = ((u32)(data[0]&0x1f) << 8) | (u32)data[1];
if (reg == 0) {
dev_dbg(&priv->i2c->dev,
"%s(): reg value out of range\n", __func__);
return 0;
}
switch (qam) {
case SONY_DVBC_CONSTELLATION_16QAM:
case SONY_DVBC_CONSTELLATION_64QAM:
case SONY_DVBC_CONSTELLATION_256QAM:
/* SNR(dB) = -9.50 * ln(IREG_SNR_ESTIMATE / (24320)) */
if (reg < 126)
reg = 126;
*snr = -95 * (int32_t)sony_log(reg) + 95941;
break;
case SONY_DVBC_CONSTELLATION_32QAM:
case SONY_DVBC_CONSTELLATION_128QAM:
/* SNR(dB) = -8.75 * ln(IREG_SNR_ESTIMATE / (20800)) */
if (reg < 69)
reg = 69;
*snr = -88 * (int32_t)sony_log(reg) + 86999;
break;
default:
return -EINVAL;
}
return 0;
}
static int cxd2841er_read_snr_t(struct cxd2841er_priv *priv, u32 *snr)
@ -1871,23 +1934,29 @@ static void cxd2841er_read_signal_strength(struct dvb_frontend *fe)
static void cxd2841er_read_snr(struct dvb_frontend *fe)
{
u32 tmp = 0;
int ret = 0;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct cxd2841er_priv *priv = fe->demodulator_priv;
dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
switch (p->delivery_system) {
case SYS_DVBC_ANNEX_A:
case SYS_DVBC_ANNEX_B:
case SYS_DVBC_ANNEX_C:
ret = cxd2841er_read_snr_c(priv, &tmp);
break;
case SYS_DVBT:
cxd2841er_read_snr_t(priv, &tmp);
ret = cxd2841er_read_snr_t(priv, &tmp);
break;
case SYS_DVBT2:
cxd2841er_read_snr_t2(priv, &tmp);
ret = cxd2841er_read_snr_t2(priv, &tmp);
break;
case SYS_ISDBT:
cxd2841er_read_snr_i(priv, &tmp);
ret = cxd2841er_read_snr_i(priv, &tmp);
break;
case SYS_DVBS:
case SYS_DVBS2:
tmp = cxd2841er_dvbs_read_snr(priv, p->delivery_system);
ret = cxd2841er_dvbs_read_snr(priv, p->delivery_system, &tmp);
break;
default:
dev_dbg(&priv->i2c->dev, "%s(): unknown delivery system %d\n",
@ -1896,8 +1965,12 @@ static void cxd2841er_read_snr(struct dvb_frontend *fe)
return;
}
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].svalue = tmp;
if (!ret) {
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].svalue = tmp;
} else {
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
}
static void cxd2841er_read_ucblocks(struct dvb_frontend *fe)