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V4L/DVB (6501): stv0297: Signal strength fixes

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Fixes the signal strength value (higher value = higher signal strength)
and scales the value to the range of 0..ffff. The characteristic 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.

Signed-off-by: Hartmut Birr <e9hack@googlemail.com>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hartmut Birr 2007-10-31 02:04:16 -03:00 committed by Mauro Carvalho Chehab
parent 7cccccc33a
commit 85085ad7b2
1 changed files with 16 additions and 4 deletions
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20
drivers/media/dvb/frontends/stv0297.c
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@ -358,11 +358,23 @@ static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber)
static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength) static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
{ {
struct stv0297_state *state = fe->demodulator_priv; struct stv0297_state *state = fe->demodulator_priv;
u8 STRENGTH[2]; u8 STRENGTH[3];
u16 tmp;
stv0297_readregs(state, 0x41, STRENGTH, 2);
*strength = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
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; return 0;
} }