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V4L/DVB (7731): tuner-xc2028: fix signal strength calculus

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Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2008-04-24 11:19:55 -03:00
parent c21f1e2e39
commit b0166ab3a6
1 changed files with 10 additions and 3 deletions
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13
drivers/media/video/tuner-xc2028.c
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@ -844,21 +844,28 @@ static int xc2028_signal(struct dvb_frontend *fe, u16 *strength)
/* Sync Lock Indicator */
rc = xc2028_get_reg(priv, 0x0002, &frq_lock);
if (rc < 0 || frq_lock == 0)
if (rc < 0)
goto ret;
/* Frequency is locked. Return signal quality */
/* Frequency is locked */
if (frq_lock == 1)
signal = 32768;
/* Get SNR of the video signal */
rc = xc2028_get_reg(priv, 0x0040, &signal);
if (rc < 0)
signal = -frq_lock;
goto ret;
/* Use both frq_lock and signal to generate the result */
signal = signal || ((signal & 0x07) << 12);
ret:
mutex_unlock(&priv->lock);
*strength = signal;
tuner_dbg("signal strength is %d\n", signal);
return rc;
}