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Commit 73983497 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] rtl2832: implement .read_snr() 



Based rtl2830 implementation.

Cc: Thomas Mair <thomas.mair86@googlemail.com>
Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0ce67a2a

drivers/media/dvb-frontends/rtl2832.c

+49 −3
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
 */



#include "rtl2832_priv.h"

#include "dvb_math.h"

#include <linux/bitops.h>



int rtl2832_debug;
@@ -355,7 +356,6 @@ err: 


}





static int rtl2832_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)

{

	int ret;
@@ -379,8 +379,6 @@ err: 
	return ret;

}







static int rtl2832_init(struct dvb_frontend *fe)

{

	struct rtl2832_priv *priv = fe->demodulator_priv;
@@ -780,6 +778,52 @@ err: 
	return ret;

}



static int rtl2832_read_snr(struct dvb_frontend *fe, u16 *snr)

{

	struct rtl2832_priv *priv = fe->demodulator_priv;

	int ret, hierarchy, constellation;

	u8 buf[2], tmp;

	u16 tmp16;

#define CONSTELLATION_NUM 3

#define HIERARCHY_NUM 4

	static const u32 snr_constant[CONSTELLATION_NUM][HIERARCHY_NUM] = {

		{ 85387325, 85387325, 85387325, 85387325 },

		{ 86676178, 86676178, 87167949, 87795660 },

		{ 87659938, 87659938, 87885178, 88241743 },

	};



	/* reports SNR in resolution of 0.1 dB */



	ret = rtl2832_rd_reg(priv, 0x3c, 3, &tmp);

	if (ret)

		goto err;



	constellation = (tmp >> 2) & 0x03; /* [3:2] */

	if (constellation > CONSTELLATION_NUM - 1)

		goto err;



	hierarchy = (tmp >> 4) & 0x07; /* [6:4] */

	if (hierarchy > HIERARCHY_NUM - 1)

		goto err;



	ret = rtl2832_rd_regs(priv, 0x0c, 4, buf, 2);

	if (ret)

		goto err;



	tmp16 = buf[0] << 8 | buf[1];



	if (tmp16)

		*snr = (snr_constant[constellation][hierarchy] -

				intlog10(tmp16)) / ((1 << 24) / 100);

	else

		*snr = 0;



	return 0;

err:

	dbg("%s: failed=%d", __func__, ret);

	return ret;

}



static struct dvb_frontend_ops rtl2832_ops;



static void rtl2832_release(struct dvb_frontend *fe)
@@ -864,6 +908,8 @@ static struct dvb_frontend_ops rtl2832_ops = { 
	.get_frontend = rtl2832_get_frontend,



	.read_status = rtl2832_read_status,

	.read_snr = rtl2832_read_snr,



	.i2c_gate_ctrl = rtl2832_i2c_gate_ctrl,

};