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| author | Barry Scott <barry.scott@onelan.co.uk> | 2005-09-09 13:02:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 13:57:37 -0700 |
| commit | 4ff4ac1beae58a2fea7ec2ad43d6c3b60d90ec61 (patch) | |
| tree | 88f7f1956d0f0514d04ea78cbb2352c4f583c2d1 /drivers/media/dvb/frontends/mt352.c | |
| parent | 50b447d5b70dc4021ae3b4eaf8ce98932f61a413 (diff) | |
| download | lwn-4ff4ac1beae58a2fea7ec2ad43d6c3b60d90ec61.tar.gz lwn-4ff4ac1beae58a2fea7ec2ad43d6c3b60d90ec61.zip | |
[PATCH] dvb: frontend: mt352: fix signal strength reading
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 <barry.scott@onelan.co.uk>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/media/dvb/frontends/mt352.c')
| -rw-r--r-- | drivers/media/dvb/frontends/mt352.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/media/dvb/frontends/mt352.c b/drivers/media/dvb/frontends/mt352.c index d32dc4de9e7f..cc1bc0edd65e 100644 --- a/drivers/media/dvb/frontends/mt352.c +++ b/drivers/media/dvb/frontends/mt352.c @@ -462,9 +462,11 @@ static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength) { 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; } |