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Commit b0cdf1a1 authored by Jemma Denson's avatar Jemma Denson Committed by Mauro Carvalho Chehab
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[media] cx24120: Improve cooked signal strength value 



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: default avatarJemma Denson <jdenson@gmail.com>
Signed-off-by: default avatarPatrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 34ce475d

drivers/media/dvb-frontends/cx24120.c

+10 −10
Original line number Original line Diff line number Diff line
@@ -608,8 +608,8 @@ static void cx24120_get_stats(struct cx24120_state *state) 
	struct dvb_frontend *fe = &state->frontend;

	struct dvb_frontend *fe = &state->frontend;

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	struct cx24120_cmd cmd;

	struct cx24120_cmd cmd;

	int ret, sigstr_h, sigstr_l;

	int ret;

	u16 u16tmp;

	u16 sig;





	dev_dbg(&state->i2c->dev, "%s()\n", __func__);

	dev_dbg(&state->i2c->dev, "%s()\n", __func__);
@@ -626,18 +626,18 @@ static void cx24120_get_stats(struct cx24120_state *state) 
		}

		}





		/* raw */

		/* raw */

		sigstr_h = (cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6) << 8;

		sig = cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6;

		sigstr_l = cx24120_readreg(state, CX24120_REG_SIGSTR_L);

		sig = sig << 8;

		dev_dbg(&state->i2c->dev, "%s: Signal strength from firmware= 0x%x\n",

		sig |= cx24120_readreg(state, CX24120_REG_SIGSTR_L);

			__func__, (sigstr_h | sigstr_l));

		dev_dbg(&state->i2c->dev,

			"%s: Signal strength from firmware= 0x%x\n",

			__func__, sig);





		/* cooked */

		/* cooked */

		u16tmp = ((sigstr_h | sigstr_l)  << 5) & 0x0000ffff;

		sig = -100 * sig + 94324;

		dev_dbg(&state->i2c->dev, "%s: Signal strength= 0x%x\n",

			__func__, u16tmp);





		c->strength.stat[0].scale = FE_SCALE_RELATIVE;

		c->strength.stat[0].scale = FE_SCALE_RELATIVE;

		c->strength.stat[0].uvalue = u16tmp;

		c->strength.stat[0].uvalue = sig;

	} else {

	} else {

		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

	}

	}