From e5afd9894d730dd012ad6b73e6e56cf99e6266a2 Mon Sep 17 00:00:00 2001 From: Steve Markgraf Date: Sat, 9 Jun 2012 00:17:09 +0200 Subject: tuner_fc0012: add manual gain support Signed-off-by: Steve Markgraf --- src/tuner_fc0012.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) (limited to 'src/tuner_fc0012.c') diff --git a/src/tuner_fc0012.c b/src/tuner_fc0012.c index c1ad73c..91ac882 100644 --- a/src/tuner_fc0012.c +++ b/src/tuner_fc0012.c @@ -307,6 +307,33 @@ exit: int fc0012_set_gain(void *dev, int gain) { - /* TODO add gain regulation */ - return 0; + int ret; + uint8_t tmp = 0; + + ret = fc0012_readreg(dev, 0x13, &tmp); + + /* mask bits off */ + tmp &= 0xe0; + + switch (gain) { + case -99: /* -9.9 dB */ + tmp |= 0x02; + break; + case -40: /* -4 dB */ + break; + case 71: + tmp |= 0x08; /* 7.1 dB */ + break; + case 179: + tmp |= 0x17; /* 17.9 dB */ + break; + case 192: + default: + tmp |= 0x10; /* 19.2 dB */ + break; + } + + ret = fc0012_writereg(dev, 0x13, tmp); + + return ret; } -- cgit v1.2.3