From: Barry Scott <[email protected]>
Fix two problems with the signal strength value in the mt352.c frontend:
1. the 4 most significant bits are zeroed - shift and mask wrong way round
2. need to align the 12 bits from the registers at the top of the 16 bit
returned value - otherwise the range is not 0 to 0xffff its 0xf000 to 0xffff
Signed-off-by: Barry Scott <[email protected]>
Signed-off-by: Johannes Stezenbach <[email protected]>
drivers/media/dvb/frontends/mt352.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- linux-2.6.13-git4.orig/drivers/media/dvb/frontends/mt352.c 2005-09-04 22:24:24.000000000 +0200
+++ linux-2.6.13-git4/drivers/media/dvb/frontends/mt352.c 2005-09-04 22:28:02.000000000 +0200
@@ -462,9 +462,11 @@ static int mt352_read_signal_strength(st
{
struct mt352_state* state = fe->demodulator_priv;
- u16 signal = ((mt352_read_register(state, AGC_GAIN_1) << 8) & 0x0f) |
- (mt352_read_register(state, AGC_GAIN_0));
+ /* align the 12 bit AGC gain with the most significant bits */
+ u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) |
+ (mt352_read_register(state, AGC_GAIN_0) << 4);
+ /* inverse of gain is signal strength */
*strength = ~signal;
return 0;
}
--
-
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