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