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[media] drxk: use a better calculus for RF strength

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The AZ6007 driver released by Terratec has a better way to
estimate the signal strength, at CtrlSigStrength(). Port it
to the driver.
It should be noticed that there are two parameters there that
are tuner-specific.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-03-20 08:21:52 -03:00
parent 8f3741e028
commit 59a7a23c47
1 changed files with 109 additions and 17 deletions
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126
drivers/media/dvb-frontends/drxk_hard.c
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@ -6390,6 +6390,107 @@ static int drxk_set_parameters(struct dvb_frontend *fe)
return 0;
}
static int get_strength(struct drxk_state *state, u64 *strength)
{
int status;
struct SCfgAgc rfAgc, ifAgc;
u32 totalGain = 0;
u32 atten = 0;
u32 agcRange = 0;
u16 scu_lvl = 0;
u16 scu_coc = 0;
/* FIXME: those are part of the tuner presets */
u16 tunerRfGain = 50; /* Default value on az6007 driver */
u16 tunerIfGain = 40; /* Default value on az6007 driver */
*strength = 0;
if (IsDVBT(state)) {
rfAgc = state->m_dvbtRfAgcCfg;
ifAgc = state->m_dvbtIfAgcCfg;
} else if (IsQAM(state)) {
rfAgc = state->m_qamRfAgcCfg;
ifAgc = state->m_qamIfAgcCfg;
} else {
rfAgc = state->m_atvRfAgcCfg;
ifAgc = state->m_atvIfAgcCfg;
}
if (rfAgc.ctrlMode == DRXK_AGC_CTRL_AUTO) {
/* SCU outputLevel */
status = read16(state, SCU_RAM_AGC_RF_IACCU_HI__A, &scu_lvl);
if (status < 0)
return status;
/* SCU c.o.c. */
read16(state, SCU_RAM_AGC_RF_IACCU_HI_CO__A, &scu_coc);
if (status < 0)
return status;
if (((u32) scu_lvl + (u32) scu_coc) < 0xffff)
rfAgc.outputLevel = scu_lvl + scu_coc;
else
rfAgc.outputLevel = 0xffff;
/* Take RF gain into account */
totalGain += tunerRfGain;
/* clip output value */
if (rfAgc.outputLevel < rfAgc.minOutputLevel)
rfAgc.outputLevel = rfAgc.minOutputLevel;
if (rfAgc.outputLevel > rfAgc.maxOutputLevel)
rfAgc.outputLevel = rfAgc.maxOutputLevel;
agcRange = (u32) (rfAgc.maxOutputLevel - rfAgc.minOutputLevel);
if (agcRange > 0) {
atten += 100UL *
((u32)(tunerRfGain)) *
((u32)(rfAgc.outputLevel - rfAgc.minOutputLevel))
/ agcRange;
}
}
if (ifAgc.ctrlMode == DRXK_AGC_CTRL_AUTO) {
status = read16(state, SCU_RAM_AGC_IF_IACCU_HI__A,
&ifAgc.outputLevel);
if (status < 0)
return status;
status = read16(state, SCU_RAM_AGC_INGAIN_TGT_MIN__A,
&ifAgc.top);
if (status < 0)
return status;
/* Take IF gain into account */
totalGain += (u32) tunerIfGain;
/* clip output value */
if (ifAgc.outputLevel < ifAgc.minOutputLevel)
ifAgc.outputLevel = ifAgc.minOutputLevel;
if (ifAgc.outputLevel > ifAgc.maxOutputLevel)
ifAgc.outputLevel = ifAgc.maxOutputLevel;
agcRange = (u32) (ifAgc.maxOutputLevel - ifAgc.minOutputLevel);
if (agcRange > 0) {
atten += 100UL *
((u32)(tunerIfGain)) *
((u32)(ifAgc.outputLevel - ifAgc.minOutputLevel))
/ agcRange;
}
}
/*
* Convert to 0..65535 scale.
* If it can't be measured (AGC is disabled), just show 100%.
*/
if (totalGain > 0)
*strength = (65535UL * atten / totalGain);
else
*strength = 65535;
return 0;
}
static int drxk_get_stats(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
@ -6404,7 +6505,7 @@ static int drxk_get_stats(struct dvb_frontend *fe)
u32 pre_bit_count;
u32 pkt_count;
u32 pkt_error_count;
s32 cnr, gain;
s32 cnr;
if (state->m_DrxkState == DRXK_NO_DEV)
return -ENODEV;
@ -6421,6 +6522,13 @@ static int drxk_get_stats(struct dvb_frontend *fe)
if (stat == DEMOD_LOCK)
state->fe_status |= 0x07;
/*
* Estimate signal strength from AGC
*/
get_strength(state, &c->strength.stat[0].uvalue);
c->strength.stat[0].scale = FE_SCALE_RELATIVE;
if (stat >= DEMOD_LOCK) {
GetSignalToNoise(state, &cnr);
c->cnr.stat[0].svalue = cnr * 100;
@ -6500,22 +6608,6 @@ static int drxk_get_stats(struct dvb_frontend *fe)
c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
c->post_bit_count.stat[0].uvalue += post_bit_count;
/*
* Read AGC gain
*
* IFgain = (IQM_AF_AGC_IF__A * 26.75) (nA)
*/
status = read16(state, IQM_AF_AGC_IF__A, &reg16);
if (status < 0) {
printk(KERN_ERR "drxk: Error %d on %s\n", status, __func__);
return status;
}
gain = 2675 * (reg16 - DRXK_AGC_DAC_OFFSET) / 100;
/* FIXME: it makes sense to fix the scale here to dBm */
c->strength.stat[0].scale = FE_SCALE_RELATIVE;
c->strength.stat[0].uvalue = gain;
error:
return status;
}