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[media] cx24120: Improve cooked signal strength value

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Algorithm copied from cx24117.c - it seems to work. Showing 95% on
a signal I know to be somewhere around 74dBuV.

[mchehab@osg.samsung.net: merged two patches, to avoid breaking compilation]
Signed-off-by: Jemma Denson <jdenson@gmail.com>
Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Jemma Denson 2015-05-05 18:09:45 -03:00 committed by Mauro Carvalho Chehab
parent 34ce475d32
commit b0cdf1a16f
1 changed files with 10 additions and 10 deletions
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20
drivers/media/dvb-frontends/cx24120.c
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@ -608,8 +608,8 @@ static void cx24120_get_stats(struct cx24120_state *state)
struct dvb_frontend *fe = &state->frontend;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct cx24120_cmd cmd;
int ret, sigstr_h, sigstr_l;
u16 u16tmp;
int ret;
u16 sig;
dev_dbg(&state->i2c->dev, "%s()\n", __func__);
@ -626,18 +626,18 @@ static void cx24120_get_stats(struct cx24120_state *state)
}
/* raw */
sigstr_h = (cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6) << 8;
sigstr_l = cx24120_readreg(state, CX24120_REG_SIGSTR_L);
dev_dbg(&state->i2c->dev, "%s: Signal strength from firmware= 0x%x\n",
__func__, (sigstr_h | sigstr_l));
sig = cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6;
sig = sig << 8;
sig |= cx24120_readreg(state, CX24120_REG_SIGSTR_L);
dev_dbg(&state->i2c->dev,
"%s: Signal strength from firmware= 0x%x\n",
__func__, sig);
/* cooked */
u16tmp = ((sigstr_h | sigstr_l) << 5) & 0x0000ffff;
dev_dbg(&state->i2c->dev, "%s: Signal strength= 0x%x\n",
__func__, u16tmp);
sig = -100 * sig + 94324;
c->strength.stat[0].scale = FE_SCALE_RELATIVE;
c->strength.stat[0].uvalue = u16tmp;
c->strength.stat[0].uvalue = sig;
} else {
c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}