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[media] fc0012 ver. 0.6: introduction of get_rf_strength function
Changes compared to version 0.5 of driver (sent 6 May): - Initial implementation of get_rf_strength function. Signed-off-by: Hans-Frieder Vogt <hfvogt@gmx.net> Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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1 changed files with 71 additions and 1 deletions
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@ -343,6 +343,74 @@ static int fc0012_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
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return 0;
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}
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#define INPUT_ADC_LEVEL -8
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static int fc0012_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
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{
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struct fc0012_priv *priv = fe->tuner_priv;
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int ret;
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unsigned char tmp;
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int int_temp, lna_gain, int_lna, tot_agc_gain, power;
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const int fc0012_lna_gain_table[] = {
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/* low gain */
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-63, -58, -99, -73,
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-63, -65, -54, -60,
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/* middle gain */
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71, 70, 68, 67,
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65, 63, 61, 58,
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/* high gain */
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197, 191, 188, 186,
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184, 182, 181, 179,
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};
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
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ret = fc0012_writereg(priv, 0x12, 0x00);
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if (ret)
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goto err;
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ret = fc0012_readreg(priv, 0x12, &tmp);
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if (ret)
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goto err;
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int_temp = tmp;
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ret = fc0012_readreg(priv, 0x13, &tmp);
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if (ret)
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goto err;
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lna_gain = tmp & 0x1f;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
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if (lna_gain < ARRAY_SIZE(fc0012_lna_gain_table)) {
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int_lna = fc0012_lna_gain_table[lna_gain];
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tot_agc_gain = (abs((int_temp >> 5) - 7) - 2 +
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(int_temp & 0x1f)) * 2;
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power = INPUT_ADC_LEVEL - tot_agc_gain - int_lna / 10;
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if (power >= 45)
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*strength = 255; /* 100% */
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else if (power < -95)
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*strength = 0;
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else
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*strength = (power + 95) * 255 / 140;
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*strength |= *strength << 8;
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} else {
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ret = -1;
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}
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goto exit;
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err:
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
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exit:
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if (ret)
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warn("%s: failed: %d", __func__, ret);
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return ret;
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}
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static const struct dvb_tuner_ops fc0012_tuner_ops = {
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.info = {
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@ -363,6 +431,8 @@ static const struct dvb_tuner_ops fc0012_tuner_ops = {
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.get_frequency = fc0012_get_frequency,
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.get_if_frequency = fc0012_get_if_frequency,
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.get_bandwidth = fc0012_get_bandwidth,
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.get_rf_strength = fc0012_get_rf_strength,
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};
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struct dvb_frontend *fc0012_attach(struct dvb_frontend *fe,
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@ -394,4 +464,4 @@ EXPORT_SYMBOL(fc0012_attach);
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MODULE_DESCRIPTION("Fitipower FC0012 silicon tuner driver");
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MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.5");
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MODULE_VERSION("0.6");
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