media: af9013: dvbv5 signal strength
Implement dvbv5 signal strength estimate. We know tuner dependent -80dBm and -50dBm agc values, construct line equation and use it to map agc value to signal strength estimate. Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -41,8 +41,11 @@ struct af9013_state {
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u16 snr;
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u32 bandwidth_hz;
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enum fe_status fe_status;
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/* RF and IF AGC limits used for signal strength calc */
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u8 strength_en, rf_agc_50, rf_agc_80, if_agc_50, if_agc_80;
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unsigned long set_frontend_jiffies;
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unsigned long read_status_jiffies;
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unsigned long strength_jiffies;
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bool first_tune;
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bool i2c_gate_state;
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unsigned int statistics_step:3;
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@ -751,8 +754,12 @@ static int af9013_read_status(struct dvb_frontend *fe, enum fe_status *status)
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{
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struct af9013_state *state = fe->demodulator_priv;
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struct i2c_client *client = state->client;
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int ret;
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unsigned int utmp, utmp1;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int ret, stmp1;
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unsigned int utmp, utmp1, utmp2, utmp3, utmp4;
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u8 buf[2];
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dev_dbg(&client->dev, "\n");
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/*
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* Return status from the cache if it is younger than 2000ms with the
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@ -791,6 +798,77 @@ static int af9013_read_status(struct dvb_frontend *fe, enum fe_status *status)
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*status = utmp1;
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}
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/* Signal strength */
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switch (state->strength_en) {
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case 0:
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/* Check if we support signal strength */
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ret = regmap_read(state->regmap, 0x9bee, &utmp);
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if (ret)
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goto err;
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if ((utmp >> 0) & 0x01) {
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/* Read agc values for signal strength estimation */
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ret = regmap_read(state->regmap, 0x9bbd, &utmp1);
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if (ret)
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goto err;
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ret = regmap_read(state->regmap, 0x9bd0, &utmp2);
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if (ret)
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goto err;
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ret = regmap_read(state->regmap, 0x9be2, &utmp3);
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if (ret)
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goto err;
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ret = regmap_read(state->regmap, 0x9be4, &utmp4);
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if (ret)
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goto err;
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state->rf_agc_50 = utmp1;
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state->rf_agc_80 = utmp2;
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state->if_agc_50 = utmp3;
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state->if_agc_80 = utmp4;
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dev_dbg(&client->dev,
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"rf_agc_50 %u, rf_agc_80 %u, if_agc_50 %u, if_agc_80 %u\n",
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utmp1, utmp2, utmp3, utmp4);
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state->strength_en = 1;
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} else {
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/* Signal strength is not supported */
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state->strength_en = 2;
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break;
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}
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/* Fall through */
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case 1:
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if (time_is_after_jiffies(state->strength_jiffies + msecs_to_jiffies(2000)))
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break;
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/* Read value */
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ret = regmap_bulk_read(state->regmap, 0xd07c, buf, 2);
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if (ret)
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goto err;
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/*
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* Construct line equation from tuner dependent -80/-50 dBm agc
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* limits and use it to map current agc value to dBm estimate
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*/
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#define agc_gain (buf[0] + buf[1])
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#define agc_gain_50dbm (state->rf_agc_50 + state->if_agc_50)
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#define agc_gain_80dbm (state->rf_agc_80 + state->if_agc_80)
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stmp1 = 30000 * (agc_gain - agc_gain_80dbm) /
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(agc_gain_50dbm - agc_gain_80dbm) - 80000;
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dev_dbg(&client->dev,
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"strength %d, agc_gain %d, agc_gain_50dbm %d, agc_gain_80dbm %d\n",
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stmp1, agc_gain, agc_gain_50dbm, agc_gain_80dbm);
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state->strength_jiffies = jiffies;
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c->strength.stat[0].scale = FE_SCALE_DECIBEL;
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c->strength.stat[0].svalue = stmp1;
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break;
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default:
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c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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break;
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}
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return 0;
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err:
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dev_dbg(&client->dev, "failed %d\n", ret);
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@ -1512,6 +1590,7 @@ static int af9013_probe(struct i2c_client *client,
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/* Init stats to indicate which stats are supported */
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c = &state->fe.dtv_property_cache;
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c->strength.len = 1;
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c->cnr.len = 1;
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dev_info(&client->dev, "Afatech AF9013 successfully attached\n");
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