[PATCH] fc0013 ver. 0.2: introduction of get_rf_strength function

[Hans-Frieder Vogt]

Changes compared to version 0.1 of driver (sent 6 May):
- Initial implementation of get_rf_strength function.
- Introduction of a warning message

Signed-off-by: Hans-Frieder Vogt <hfv...@gmx.net>

 fc0013.c |   74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff -up --new-file --recursive a/drivers/media/common/tuners/fc0013.c 
b/drivers/media/common/tuners/fc0013.c
--- a/drivers/media/common/tuners/fc0013.c      2012-05-12 10:54:01.093352494 
+0200
+++ b/drivers/media/common/tuners/fc0013.c      2012-05-12 11:00:29.940455095 
+0200
@@ -484,6 +484,8 @@ static int fc0013_set_params(struct dvb_
 exit:
        if (fe->ops.i2c_gate_ctrl)
                fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+       if (ret)
+               warn("%s: failed: %d", __func__, ret);
        return ret;
 }
 
@@ -508,6 +510,74 @@ static int fc0013_get_bandwidth(struct d
        return 0;
 }
 
+#define INPUT_ADC_LEVEL        -8
+
+static int fc0013_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
+{
+       struct fc0013_priv *priv = fe->tuner_priv;
+       int ret;
+       unsigned char tmp;
+       int int_temp, lna_gain, int_lna, tot_agc_gain, power;
+       const int fc0013_lna_gain_table[] = {
+               /* low gain */
+               -63, -58, -99, -73,
+               -63, -65, -54, -60,
+               /* middle gain */
+                71,  70,  68,  67,
+                65,  63,  61,  58,
+               /* high gain */
+               197, 191, 188, 186,
+               184, 182, 181, 179,
+       };
+
+       if (fe->ops.i2c_gate_ctrl)
+               fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
+
+       ret = fc0013_writereg(priv, 0x13, 0x00);
+       if (ret)
+               goto err;
+
+       ret = fc0013_readreg(priv, 0x13, &tmp);
+       if (ret)
+               goto err;
+       int_temp = tmp;
+
+       ret = fc0013_readreg(priv, 0x14, &tmp);
+       if (ret)
+               goto err;
+       lna_gain = tmp & 0x1f;
+
+       if (fe->ops.i2c_gate_ctrl)
+               fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+
+       if (lna_gain < ARRAY_SIZE(fc0013_lna_gain_table)) {
+               int_lna = fc0013_lna_gain_table[lna_gain];
+               tot_agc_gain = (abs((int_temp >> 5) - 7) - 2 +
+                               (int_temp & 0x1f)) * 2;
+               power = INPUT_ADC_LEVEL - tot_agc_gain - int_lna / 10;
+
+               if (power >= 45)
+                       *strength = 255;        /* 100% */
+               else if (power < -95)
+                       *strength = 0;
+               else
+                       *strength = (power + 95) * 255 / 140;
+
+               *strength |= *strength << 8;
+       } else {
+               ret = -1;
+       }
+
+       goto exit;
+
+err:
+       if (fe->ops.i2c_gate_ctrl)
+               fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+exit:
+       if (ret)
+               warn("%s: failed: %d", __func__, ret);
+       return ret;
+}
 
 static const struct dvb_tuner_ops fc0013_tuner_ops = {
        .info = {
@@ -528,6 +598,8 @@ static const struct dvb_tuner_ops fc0013
        .get_frequency  = fc0013_get_frequency,
        .get_if_frequency = fc0013_get_if_frequency,
        .get_bandwidth  = fc0013_get_bandwidth,
+
+       .get_rf_strength = fc0013_get_rf_strength,
 };
 
 struct dvb_frontend *fc0013_attach(struct dvb_frontend *fe,
@@ -559,4 +631,4 @@ EXPORT_SYMBOL(fc0013_attach);
 MODULE_DESCRIPTION("Fitipower FC0013 silicon tuner driver");
 MODULE_AUTHOR("Hans-Frieder Vogt <hfv...@gmx.net>");
 MODULE_LICENSE("GPL");
-MODULE_VERSION("0.1");
+MODULE_VERSION("0.2");

Hans-Frieder Vogt                       e-mail: hfvogt <at> gmx .dot. net
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