Hi,
the attached patch fixes the increasing of the signal strength value (higher value = higher signal
strength) and scales the value to the range of 0..ffff. The charcteristic itself is wrong. To get
proper values on a TT-C2300 in the range of 40..60% real signal strength, the values from the patch
should be divide by two. The attached patch doesn't fix the characteristic.
- Hartmut
signed-off-by: Hartmut Birr <e9hack@xxxxxxxxxxxxxx>
- The value of the signal strength depends on the configuration of the agc polarity.
diff -r 603862cf6d21 linux/drivers/media/dvb/frontends/stv0297.c
--- a/linux/drivers/media/dvb/frontends/stv0297.c Tue Oct 02 13:37:21 2007 -0700
+++ b/linux/drivers/media/dvb/frontends/stv0297.c Wed Oct 03 14:28:53 2007 +0200
@@ -358,11 +358,23 @@ static int stv0297_read_signal_strength(
static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
{
struct stv0297_state *state = fe->demodulator_priv;
- u8 STRENGTH[2];
-
- stv0297_readregs(state, 0x41, STRENGTH, 2);
- *strength = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
-
+ u8 STRENGTH[3];
+ u16 tmp;
+
+ stv0297_readregs(state, 0x41, STRENGTH, 3);
+ tmp = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
+ if (STRENGTH[2] & 0x20) {
+ if (tmp < 0x200)
+ tmp = 0;
+ else
+ tmp = tmp - 0x200;
+ } else {
+ if (tmp > 0x1ff)
+ tmp = 0;
+ else
+ tmp = 0x1ff - tmp;
+ }
+ *strength = (tmp << 7) | (tmp >> 2);
return 0;
}
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