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: Hartmut Birr <e9hack@googlemail.com> Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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@ -358,11 +358,23 @@ static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber)
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static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
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{
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struct stv0297_state *state = fe->demodulator_priv;
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u8 STRENGTH[2];
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stv0297_readregs(state, 0x41, STRENGTH, 2);
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*strength = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
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u8 STRENGTH[3];
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u16 tmp;
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stv0297_readregs(state, 0x41, STRENGTH, 3);
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tmp = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
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if (STRENGTH[2] & 0x20) {
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if (tmp < 0x200)
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tmp = 0;
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else
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tmp = tmp - 0x200;
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} else {
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if (tmp > 0x1ff)
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tmp = 0;
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else
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tmp = 0x1ff - tmp;
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}
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*strength = (tmp << 7) | (tmp >> 2);
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return 0;
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}
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