[media] rtl2830: implement DVBv5 signal strength statistics (871f7025) · Commits · 戴 / test

drivers/media/dvb-frontends/rtl2830.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -246,6 +246,8 @@ static int rtl2830_init(struct dvb_frontend *fe)
		goto err;

		/* init stats here in order signal app which stats are supported */
		c->strength.len = 1;
		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		c->cnr.len = 1;
		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		/* start statistics polling */
		@@ -693,6 +695,28 @@ static void rtl2830_stat_work(struct work_struct *work)

		dev_dbg(&client->dev, "\n");

		/* signal strength */
		if (dev->fe_status & FE_HAS_SIGNAL) {
		struct {signed int x:14; } s;

		/* read IF AGC */
		ret = rtl2830_rd_regs(client, 0x359, buf, 2);
		if (ret)
		goto err;

		u16tmp = buf[0] << 8 \| buf[1] << 0;
		u16tmp &= 0x3fff; /* [13:0] */
		tmp = s.x = u16tmp; /* 14-bit bin to 2 complement */
		u16tmp = clamp_val(-4 * tmp + 32767, 0x0000, 0xffff);

		dev_dbg(&client->dev, "IF AGC=%d\n", tmp);

		c->strength.stat[0].scale = FE_SCALE_RELATIVE;
		c->strength.stat[0].uvalue = u16tmp;
		} else {
		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		}

		/* CNR */
		if (dev->fe_status & FE_HAS_VITERBI) {
		unsigned hierarchy, constellation;