[media] mn88472: implement cnr statistics (c635a5e2) · Commits · 戴 / test

drivers/media/dvb-frontends/mn88472.c

+87 −3

Original line number	Diff line number	Diff line
		@@ -28,9 +28,9 @@ static int mn88472_read_status(struct dvb_frontend fe, enum fe_status status)
		struct i2c_client *client = fe->demodulator_priv;
		struct mn88472_dev *dev = i2c_get_clientdata(client);
		struct dtv_frontend_properties *c = &fe->dtv_property_cache;
		int ret, i;
		unsigned int utmp, utmp1;
		u8 buf[2];
		int ret, i, stmp;
		unsigned int utmp, utmp1, utmp2;
		u8 buf[5];

		if (!dev->active) {
		ret = -EAGAIN;
		@@ -96,6 +96,89 @@ static int mn88472_read_status(struct dvb_frontend fe, enum fe_status status)
		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		}

		/* CNR */
		if (*status & FE_HAS_VITERBI && c->delivery_system == SYS_DVBT) {
		/* DVB-T CNR */
		ret = regmap_bulk_read(dev->regmap[0], 0x9c, buf, 2);
		if (ret)
		goto err;

		utmp = buf[0] << 8 \| buf[1] << 0;
		if (utmp) {
		/* CNR[dB]: 10 * log10(65536 / value) + 2 */
		/* log10(65536) = 80807124, 0.2 = 3355443 */
		stmp = ((u64)80807124 - intlog10(utmp) + 3355443)
		* 10000 >> 24;

		dev_dbg(&client->dev, "cnr=%d value=%u\n", stmp, utmp);
		} else {
		stmp = 0;
		}

		c->cnr.stat[0].svalue = stmp;
		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
		} else if (*status & FE_HAS_VITERBI &&
		c->delivery_system == SYS_DVBT2) {
		/* DVB-T2 CNR */
		for (i = 0; i < 3; i++) {
		ret = regmap_bulk_read(dev->regmap[2], 0xbc + i,
		&buf[i], 1);
		if (ret)
		goto err;
		}

		utmp = buf[1] << 8 \| buf[2] << 0;
		utmp1 = (buf[0] >> 2) & 0x01; /* 0=SISO, 1=MISO */
		if (utmp) {
		if (utmp1) {
		/* CNR[dB]: 10 * log10(16384 / value) - 6 */
		/* log10(16384) = 70706234, 0.6 = 10066330 */
		stmp = ((u64)70706234 - intlog10(utmp)
		- 10066330) * 10000 >> 24;
		dev_dbg(&client->dev, "cnr=%d value=%u MISO\n",
		stmp, utmp);
		} else {
		/* CNR[dB]: 10 * log10(65536 / value) + 2 */
		/* log10(65536) = 80807124, 0.2 = 3355443 */
		stmp = ((u64)80807124 - intlog10(utmp)
		+ 3355443) * 10000 >> 24;

		dev_dbg(&client->dev, "cnr=%d value=%u SISO\n",
		stmp, utmp);
		}
		} else {
		stmp = 0;
		}

		c->cnr.stat[0].svalue = stmp;
		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
		} else if (*status & FE_HAS_VITERBI &&
		c->delivery_system == SYS_DVBC_ANNEX_A) {
		/* DVB-C CNR */
		ret = regmap_bulk_read(dev->regmap[1], 0xa1, buf, 4);
		if (ret)
		goto err;

		utmp1 = buf[0] << 8 \| buf[1] << 0; /* signal */
		utmp2 = buf[2] << 8 \| buf[3] << 0; /* noise */
		if (utmp1 && utmp2) {
		/* CNR[dB]: 10 * log10(8 * (signal / noise)) */
		/* log10(8) = 15151336 */
		stmp = ((u64)15151336 + intlog10(utmp1)
		- intlog10(utmp2)) * 10000 >> 24;

		dev_dbg(&client->dev, "cnr=%d signal=%u noise=%u\n",
		stmp, utmp1, utmp2);
		} else {
		stmp = 0;
		}

		c->cnr.stat[0].svalue = stmp;
		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
		} else {
		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		}

		return 0;
		err:
		dev_dbg(&client->dev, "failed=%d\n", ret);
		@@ -570,6 +653,7 @@ static int mn88472_probe(struct i2c_client *client,
		/* Init stats to indicate which stats are supported */
		c = &dev->fe.dtv_property_cache;
		c->strength.len = 1;
		c->cnr.len = 1;

		/* Setup callbacks */
		pdata->get_dvb_frontend = mn88472_get_dvb_frontend;

drivers/media/dvb-frontends/mn88472_priv.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@
		#define MN88472_PRIV_H

		#include "dvb_frontend.h"
		#include "dvb_math.h"
		#include "mn88472.h"
		#include <linux/firmware.h>
		#include <linux/regmap.h>

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