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[media] lmedm04: fix the range for relative measurements

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Relative measurements are typically between 0 and 0xffff. However,
for some tuners (TUNER_S7395 and TUNER_S0194), the range were from
0 to 0xff00, with means that 100% is never archived.
Also, TUNER_RS2000 uses a more complex math.

So, create a macro that does the conversion using bit operations
and use it for all conversions.

The code is also easier to read with is a bonus.

While here, remove a bogus comment.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-06-23 12:29:46 -03:00
parent 5ae65db547
commit faebbd8f13
1 changed files with 8 additions and 11 deletions
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19
drivers/media/usb/dvb-usb-v2/lmedm04.c
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@ -257,6 +257,9 @@ static int lme2510_enable_pid(struct dvb_usb_device *d, u8 index, u16 pid_out)
return ret;
}
/* Convert range from 0x00-0xff to 0x0000-0xffff */
#define reg_to_16bits(x) ((x) | ((x) << 8))
static void lme2510_update_stats(struct dvb_usb_adapter *adap)
{
struct lme2510_state *st = adap_to_priv(adap);
@ -288,23 +291,17 @@ static void lme2510_update_stats(struct dvb_usb_adapter *adap)
switch (st->tuner_config) {
case TUNER_LG:
s_tmp = 0xff - st->signal_level;
s_tmp |= s_tmp << 8;
c_tmp = 0xff - st->signal_sn;
c_tmp |= c_tmp << 8;
s_tmp = reg_to_16bits(0xff - st->signal_level);
c_tmp = reg_to_16bits(0xff - st->signal_sn);
break;
/* fall through */
case TUNER_S7395:
case TUNER_S0194:
s_tmp = 0xffff - (((st->signal_level * 2) << 8) * 5 / 4);
c_tmp = ((0xff - st->signal_sn - 0xa1) * 3) << 8;
c_tmp = reg_to_16bits((0xff - st->signal_sn - 0xa1) * 3);
break;
case TUNER_RS2000:
s_tmp = st->signal_level * 0xffff / 0xff;
c_tmp = st->signal_sn * 0xffff / 0x7f;
s_tmp = reg_to_16bits(st->signal_level);
c_tmp = reg_to_16bits(st->signal_sn);
}
c->strength.len = 1;