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@xxxxxxxxxxxxxxx>
diff --git a/drivers/media/usb/dvb-usb-v2/lmedm04.c b/drivers/media/usb/dvb-usb-v2/lmedm04.c
index fcef2a33ef3d..4cc55b3a0558 100644
--- a/drivers/media/usb/dvb-usb-v2/lmedm04.c
+++ b/drivers/media/usb/dvb-usb-v2/lmedm04.c
@@ -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;
--
2.4.3
--
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