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fix stv0910 strength and snr values

This commit is contained in:
Ralph Metzler 2016-03-23 22:02:24 +01:00 committed by mvoelkel
parent 906efafd5e
commit c18503fcad
2 changed files with 112 additions and 37 deletions
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147
frontends/stv0910.c
View File

@ -46,7 +46,6 @@ LIST_HEAD(stvlist);
enum ReceiveMode { Mode_None, Mode_DVBS, Mode_DVBS2, Mode_Auto };
enum DVBS2_FECType { DVBS2_64K, DVBS2_16K };
enum DVBS2_ModCod {
@ -134,9 +133,9 @@ struct SInitTable {
u8 Data;
};
struct SLookupSNTable {
s16 SignalToNoise;
u16 RefValue;
struct SLookup {
s16 Value;
u16 RegValue;
};
static inline int i2c_write(struct i2c_adapter *adap, u8 adr,
@ -194,7 +193,7 @@ static int read_regs(struct stv *state, u16 reg, u8 *val, int len)
reg, val, len);
}
struct SLookupSNTable S1_SN_Lookup[] = {
struct SLookup S1_SN_Lookup[] = {
{ 0, 9242 }, /*C/N= 0dB*/
{ 05, 9105 }, /*C/N=0.5dB*/
{ 10, 8950 }, /*C/N=1.0dB*/
@ -251,7 +250,7 @@ struct SLookupSNTable S1_SN_Lookup[] = {
{ 510, 425 } /*C/N=51.0dB*/
};
struct SLookupSNTable S2_SN_Lookup[] = {
struct SLookup S2_SN_Lookup[] = {
{ -30, 13950 }, /*C/N=-2.5dB*/
{ -25, 13580 }, /*C/N=-2.5dB*/
{ -20, 13150 }, /*C/N=-2.0dB*/
@ -550,14 +549,48 @@ static int TrackingOptimization(struct stv *state)
return 0;
}
static s32 TableLookup(struct SLookup *Table,
int TableSize, u16 RegValue)
{
s32 Value;
int imin = 0;
int imax = TableSize - 1;
int i;
s32 RegDiff;
// Assumes Table[0].RegValue > Table[imax].RegValue
if( RegValue >= Table[0].RegValue )
Value = Table[0].Value;
else if( RegValue <= Table[imax].RegValue )
Value = Table[imax].Value;
else
{
while(imax-imin > 1)
{
i = (imax + imin) / 2;
if( (Table[imin].RegValue >= RegValue) && (RegValue >= Table[i].RegValue) )
imax = i;
else
imin = i;
}
RegDiff = Table[imax].RegValue - Table[imin].RegValue;
Value = Table[imin].Value;
if( RegDiff != 0 )
Value += ((s32)(RegValue - Table[imin].RegValue) *
(s32)(Table[imax].Value - Table[imin].Value))/(RegDiff);
}
return Value;
}
static int GetSignalToNoise(struct stv *state, s32 *SignalToNoise)
{
int i;
u8 Data0;
u8 Data1;
u16 Data;
int nLookup;
struct SLookupSNTable *Lookup;
struct SLookup *Lookup;
*SignalToNoise = 0;
@ -576,25 +609,7 @@ static int GetSignalToNoise(struct stv *state, s32 *SignalToNoise)
Lookup = S1_SN_Lookup;
}
Data = (((u16)Data1) << 8) | (u16) Data0;
if (Data > Lookup[0].RefValue) {
*SignalToNoise = Lookup[0].SignalToNoise;
} else if (Data <= Lookup[nLookup-1].RefValue) {
*SignalToNoise = Lookup[nLookup-1].SignalToNoise;
} else {
for (i = 0; i < nLookup - 1; i += 1) {
if (Data <= Lookup[i].RefValue &&
Data > Lookup[i+1].RefValue) {
*SignalToNoise =
(s32)(Lookup[i].SignalToNoise) +
((s32)(Data - Lookup[i].RefValue) *
(s32)(Lookup[i+1].SignalToNoise -
Lookup[i].SignalToNoise)) /
((s32)(Lookup[i+1].RefValue) -
(s32)(Lookup[i].RefValue));
break;
}
}
}
*SignalToNoise = TableLookup(Lookup, nLookup, Data);
return 0;
}
@ -1043,8 +1058,62 @@ static int get_frontend(struct dvb_frontend *fe)
{
struct stv *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u8 tmp;
if (state->ReceiveMode == Mode_DVBS2) {
u32 mc;
enum fe_modulation modcod2mod[0x20] = {
QPSK, QPSK, QPSK, QPSK,
QPSK, QPSK, QPSK, QPSK,
QPSK, QPSK, QPSK, QPSK,
PSK_8, PSK_8, PSK_8, PSK_8,
PSK_8, PSK_8, APSK_16, APSK_16,
APSK_16, APSK_16, APSK_16, APSK_16,
APSK_32, APSK_32, APSK_32, APSK_32,
APSK_32,
};
enum fe_code_rate modcod2fec[0x20] = {
FEC_NONE, FEC_1_4, FEC_1_3, FEC_2_5,
FEC_1_2, FEC_3_5, FEC_2_3, FEC_3_4,
FEC_4_5, FEC_5_6, FEC_8_9, FEC_9_10,
FEC_3_5, FEC_2_3, FEC_3_4, FEC_5_6,
FEC_8_9, FEC_9_10, FEC_2_3, FEC_3_4,
FEC_4_5, FEC_5_6, FEC_8_9, FEC_9_10,
FEC_3_4, FEC_4_5, FEC_5_6, FEC_8_9,
FEC_9_10
};
read_reg(state, RSTV0910_P2_DMDMODCOD + state->regoff, &tmp);
mc = ((tmp & 0x7c) >> 2);
p->pilot = (tmp & 0x01) ? PILOT_ON : PILOT_OFF;
p->modulation = modcod2mod[mc];
p->fec_inner = modcod2fec[mc];
} else if (state->ReceiveMode == Mode_DVBS) {
read_reg(state, RSTV0910_P2_VITCURPUN + state->regoff, &tmp);
switch( tmp & 0x1F ) {
case 0x0d:
p->fec_inner = FEC_1_2;
break;
case 0x12:
p->fec_inner = FEC_2_3;
break;
case 0x15:
p->fec_inner = FEC_3_4;
break;
case 0x18:
p->fec_inner = FEC_5_6;
break;
case 0x1a:
p->fec_inner = FEC_7_8;
break;
default:
p->fec_inner = FEC_NONE;
break;
}
p->rolloff = ROLLOFF_35;
} else {
}
return 0;
}
@ -1067,9 +1136,6 @@ static int read_status(struct dvb_frontend *fe, fe_status_t *status)
read_signal_strength(fe, &val);
read_snr(fe, &val);
p->cnr.len = 1;
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].uvalue = (s64) (s16) val;
read_ber(fe, &ber);
@ -1090,7 +1156,7 @@ static int read_status(struct dvb_frontend *fe, fe_status_t *status)
if (state->ReceiveMode == Mode_None) {
state->ReceiveMode = CurReceiveMode;
state->DemodLockTime = jiffies;
state->FirstTimeLock = 0;
state->FirstTimeLock = 1;
write_reg(state, RSTV0910_P2_TSCFGH + state->regoff,
state->tscfgh);
@ -1284,15 +1350,21 @@ static int sleep(struct dvb_frontend *fe)
return 0;
}
static int read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct stv *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
s32 SNR;
*snr = 0;
if (GetSignalToNoise(state, &SNR))
return -EIO;
*snr = SNR;
p->cnr.len = 1;
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].uvalue = 100 * (s64) SNR;
return 0;
}
@ -1369,7 +1441,7 @@ static int read_signal_strength(struct dvb_frontend *fe, u16 *strength)
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u8 Agc1, Agc0;
u8 Reg[2];
u32 pBBGain;
s32 bbgain;
s32 Power = 0;
int i;
@ -1385,15 +1457,16 @@ static int read_signal_strength(struct dvb_frontend *fe, u16 *strength)
}
Power /= 5;
pBBGain = (465 - Log10x100(Power)) * 10;
bbgain = (465 - Log10x100(Power)) * 10;
if (fe->ops.tuner_ops.get_rf_strength)
fe->ops.tuner_ops.get_rf_strength(fe, strength);
else
*strength = 0;
if (pBBGain < *strength)
*strength -= pBBGain;
printk("pwr = %d bb = %d str = %u\n", Power, bbgain, *strength);
if (bbgain < (s32) *strength)
*strength -= bbgain;
else
*strength = 0;

2
include/linux/dvb/frontend.h
View File

@ -165,6 +165,8 @@ typedef enum fe_code_rate {
FEC_3_5,
FEC_9_10,
FEC_2_5,
FEC_1_4,
FEC_1_3,
} fe_code_rate_t;