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[media] s5h1411: Calculate signal strength shown as percentage from SNR up to 35dB 

As done first in lgdt330x.c, calculate signal strength from SNR up to 35dB
Even though the SNR can go higher than 35dB, there is some comfort factor
in having a range of strong signals that can show at 100%

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Michael Krufky 2011-10-31 08:12:54 -03:00 committed by Mauro Carvalho Chehab
parent 19661c08fe
commit ead32d5357
1 changed files with 30 additions and 1 deletions
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31
drivers/media/dvb/frontends/s5h1411.c
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@ -794,7 +794,36 @@ static int s5h1411_read_snr(struct dvb_frontend *fe, u16 *snr)
static int s5h1411_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
{
return s5h1411_read_snr(fe, signal_strength);
/* borrowed from lgdt330x.c
*
* Calculate strength from SNR up to 35dB
* Even though the SNR can go higher than 35dB,
* there is some comfort factor in having a range of
* strong signals that can show at 100%
*/
u16 snr;
u32 tmp;
int ret = s5h1411_read_snr(fe, &snr);
*signal_strength = 0;
if (0 == ret) {
/* The following calculation method was chosen
* purely for the sake of code re-use from the
* other demod drivers that use this method */
/* Convert from SNR in dB * 10 to 8.24 fixed-point */
tmp = (snr * ((1 << 24) / 10));
/* Convert from 8.24 fixed-point to
* scale the range 0 - 35*2^24 into 0 - 65535*/
if (tmp >= 8960 * 0x10000)
*signal_strength = 0xffff;
else
*signal_strength = tmp / 8960;
}
return ret;
}
static int s5h1411_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)