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Commit 85085ad7 authored by Hartmut Birr's avatar Hartmut Birr Committed by Mauro Carvalho Chehab
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V4L/DVB (6501): stv0297: Signal strength fixes 



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: default avatarHartmut Birr <e9hack@googlemail.com>
Signed-off-by: default avatarOliver Endriss <o.endriss@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 7cccccc3

drivers/media/dvb/frontends/stv0297.c

+17 −5
Original line number Diff line number Diff line
@@ -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)

{

	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;

}