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media: lgdt330x: provide DVBv5 Carrier S/N measurements 

Change the logic at the driver to provide CNR stats via
DVBv5 API.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2018-03-09 10:53:34 -05:00 committed by Mauro Carvalho Chehab
parent 53d41728f2
commit 19bdd0d661
1 changed files with 40 additions and 7 deletions
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47
drivers/media/dvb-frontends/lgdt330x.c
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@ -64,7 +64,7 @@ struct lgdt330x_state {
/* Demodulator private data */
enum fe_modulation current_modulation;
u32 snr; /* Result of last SNR calculation */
u32 snr; /* Result of last SNR calculation */
/* Tuner private data */
u32 current_frequency;
@ -187,6 +187,7 @@ static int lgdt330x_sw_reset(struct lgdt330x_state *state)
static int lgdt330x_init(struct dvb_frontend *fe)
{
struct lgdt330x_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
char *chip_name;
int err;
/*
@ -292,6 +293,10 @@ static int lgdt330x_init(struct dvb_frontend *fe)
dprintk(state, "Initialized the %s chip\n", chip_name);
if (err < 0)
return err;
p->cnr.len = 1;
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
return lgdt330x_sw_reset(state);
}
@ -513,7 +518,7 @@ static u32 calculate_snr(u32 mse, u32 c)
return 10 * (c - mse);
}
static int lgdt3302_read_snr(struct dvb_frontend *fe, u16 *snr)
static int lgdt3302_read_snr(struct dvb_frontend *fe)
{
struct lgdt330x_state *state = fe->demodulator_priv;
u8 buf[5]; /* read data buffer */
@ -546,11 +551,13 @@ static int lgdt3302_read_snr(struct dvb_frontend *fe, u16 *snr)
dev_err(&state->client->dev,
"%s: Modulation set to unsupported value\n",
__func__);
state->snr = 0;
return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
}
state->snr = calculate_snr(noise, c);
*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise,
state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
@ -558,7 +565,7 @@ static int lgdt3302_read_snr(struct dvb_frontend *fe, u16 *snr)
return 0;
}
static int lgdt3303_read_snr(struct dvb_frontend *fe, u16 *snr)
static int lgdt3303_read_snr(struct dvb_frontend *fe)
{
struct lgdt330x_state *state = fe->demodulator_priv;
u8 buf[5]; /* read data buffer */
@ -591,11 +598,11 @@ static int lgdt3303_read_snr(struct dvb_frontend *fe, u16 *snr)
dev_err(&state->client->dev,
"%s: Modulation set to unsupported value\n",
__func__);
state->snr = 0;
return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
}
state->snr = calculate_snr(noise, c);
*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise,
state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
@ -603,6 +610,15 @@ static int lgdt3303_read_snr(struct dvb_frontend *fe, u16 *snr)
return 0;
}
static int lgdt330x_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct lgdt330x_state *state = fe->demodulator_priv;
*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
return 0;
}
static int lgdt330x_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
/* Calculate Strength from SNR up to 35dB */
@ -632,6 +648,7 @@ static int lgdt3302_read_status(struct dvb_frontend *fe,
enum fe_status *status)
{
struct lgdt330x_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u8 buf[3];
*status = 0; /* Reset status result */
@ -687,6 +704,13 @@ static int lgdt3302_read_status(struct dvb_frontend *fe,
__func__);
}
if (*status & FE_HAS_LOCK && lgdt3302_read_snr(fe) >= 0) {
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].svalue = (((u64)state->snr) * 1000) >> 24;
} else {
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
return 0;
}
@ -694,6 +718,7 @@ static int lgdt3303_read_status(struct dvb_frontend *fe,
enum fe_status *status)
{
struct lgdt330x_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
int err;
u8 buf[3];
@ -752,6 +777,14 @@ static int lgdt3303_read_status(struct dvb_frontend *fe,
"%s: Modulation set to unsupported value\n",
__func__);
}
if (*status & FE_HAS_LOCK && lgdt3303_read_snr(fe) >= 0) {
p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
p->cnr.stat[0].svalue = (((u64)state->snr) * 1000) >> 24;
} else {
p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
return 0;
}
@ -878,7 +911,7 @@ static const struct dvb_frontend_ops lgdt3302_ops = {
.read_status = lgdt3302_read_status,
.read_ber = lgdt330x_read_ber,
.read_signal_strength = lgdt330x_read_signal_strength,
.read_snr = lgdt3302_read_snr,
.read_snr = lgdt330x_read_snr,
.read_ucblocks = lgdt330x_read_ucblocks,
.release = lgdt330x_release,
};
@ -901,7 +934,7 @@ static const struct dvb_frontend_ops lgdt3303_ops = {
.read_status = lgdt3303_read_status,
.read_ber = lgdt330x_read_ber,
.read_signal_strength = lgdt330x_read_signal_strength,
.read_snr = lgdt3303_read_snr,
.read_snr = lgdt330x_read_snr,
.read_ucblocks = lgdt330x_read_ucblocks,
.release = lgdt330x_release,
};