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Commit e898ef62 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] af9033: implement .read_snr() 



Returns values as 0.1 dB resolution as preferred nowadays.
Actual resolution is 1 dB.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 3a871ca2

drivers/media/dvb/frontends/af9033.c

+48 −1
Original line number Original line Diff line number Diff line
@@ -540,9 +540,56 @@ static int af9033_read_status(struct dvb_frontend *fe, fe_status_t *status) 




static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr)

static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr)

{

{

	*snr = 0;

	struct af9033_state *state = fe->demodulator_priv;

	int ret, i, len;

	u8 buf[3], tmp;

	u32 snr_val;

	const struct val_snr *uninitialized_var(snr_lut);



	/* read value */

	ret = af9033_rd_regs(state, 0x80002c, buf, 3);

	if (ret < 0)

		goto err;



	snr_val = (buf[2] << 16) | (buf[1] << 8) | buf[0];



	/* read current modulation */

	ret = af9033_rd_reg(state, 0x80f903, &tmp);

	if (ret < 0)

		goto err;



	switch ((tmp >> 0) & 3) {

	case 0:

		len = ARRAY_SIZE(qpsk_snr_lut);

		snr_lut = qpsk_snr_lut;

		break;

	case 1:

		len = ARRAY_SIZE(qam16_snr_lut);

		snr_lut = qam16_snr_lut;

		break;

	case 2:

		len = ARRAY_SIZE(qam64_snr_lut);

		snr_lut = qam64_snr_lut;

		break;

	default:

		goto err;

	}



	for (i = 0; i < len; i++) {

		tmp = snr_lut[i].snr;



		if (snr_val < snr_lut[i].val)

			break;

	}



	*snr = tmp * 10; /* dB/10 */





	return 0;

	return 0;



err:

	pr_debug("%s: failed=%d\n", __func__, ret);



	return ret;

}

}





static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)

static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)

drivers/media/dvb/frontends/af9033_priv.h

+98 −0
Original line number Original line Diff line number Diff line
@@ -47,6 +47,11 @@ struct clock_adc { 
	u32 adc;

	u32 adc;

};

};





struct val_snr {

	u32 val;

	u8 snr;

};



/* Xtal clock vs. ADC clock lookup table */

/* Xtal clock vs. ADC clock lookup table */

static const struct clock_adc clock_adc_lut[] = {

static const struct clock_adc clock_adc_lut[] = {

	{ 16384000, 20480000 },

	{ 16384000, 20480000 },
@@ -85,6 +90,99 @@ static const struct coeff coeff_lut[] = { 
	},

	},

};

};





/* QPSK SNR lookup table */

static const struct val_snr qpsk_snr_lut[] = {

	{ 0x0b4771,  0 },

	{ 0x0c1aed,  1 },

	{ 0x0d0d27,  2 },

	{ 0x0e4d19,  3 },

	{ 0x0e5da8,  4 },

	{ 0x107097,  5 },

	{ 0x116975,  6 },

	{ 0x1252d9,  7 },

	{ 0x131fa4,  8 },

	{ 0x13d5e1,  9 },

	{ 0x148e53, 10 },

	{ 0x15358b, 11 },

	{ 0x15dd29, 12 },

	{ 0x168112, 13 },

	{ 0x170b61, 14 },

	{ 0x17a532, 15 },

	{ 0x180f94, 16 },

	{ 0x186ed2, 17 },

	{ 0x18b271, 18 },

	{ 0x18e118, 19 },

	{ 0x18ff4b, 20 },

	{ 0x190af1, 21 },

	{ 0x191451, 22 },

	{ 0xffffff, 23 },

};



/* QAM16 SNR lookup table */

static const struct val_snr qam16_snr_lut[] = {

	{ 0x04f0d5,  0 },

	{ 0x05387a,  1 },

	{ 0x0573a4,  2 },

	{ 0x05a99e,  3 },

	{ 0x05cc80,  4 },

	{ 0x05eb62,  5 },

	{ 0x05fecf,  6 },

	{ 0x060b80,  7 },

	{ 0x062501,  8 },

	{ 0x064865,  9 },

	{ 0x069604, 10 },

	{ 0x06f356, 11 },

	{ 0x07706a, 12 },

	{ 0x0804d3, 13 },

	{ 0x089d1a, 14 },

	{ 0x093e3d, 15 },

	{ 0x09e35d, 16 },

	{ 0x0a7c3c, 17 },

	{ 0x0afaf8, 18 },

	{ 0x0b719d, 19 },

	{ 0x0bda6a, 20 },

	{ 0x0c0c75, 21 },

	{ 0x0c3f7d, 22 },

	{ 0x0c5e62, 23 },

	{ 0x0c6c31, 24 },

	{ 0x0c7925, 25 },

	{ 0xffffff, 26 },

};



/* QAM64 SNR lookup table */

static const struct val_snr qam64_snr_lut[] = {

	{ 0x0256d0,  0 },

	{ 0x027a65,  1 },

	{ 0x029873,  2 },

	{ 0x02b7fe,  3 },

	{ 0x02cf1e,  4 },

	{ 0x02e234,  5 },

	{ 0x02f409,  6 },

	{ 0x030046,  7 },

	{ 0x030844,  8 },

	{ 0x030a02,  9 },

	{ 0x030cde, 10 },

	{ 0x031031, 11 },

	{ 0x03144c, 12 },

	{ 0x0315dd, 13 },

	{ 0x031920, 14 },

	{ 0x0322d0, 15 },

	{ 0x0339fc, 16 },

	{ 0x0364a1, 17 },

	{ 0x038bcc, 18 },

	{ 0x03c7d3, 19 },

	{ 0x0408cc, 20 },

	{ 0x043bed, 21 },

	{ 0x048061, 22 },

	{ 0x04be95, 23 },

	{ 0x04fa7d, 24 },

	{ 0x052405, 25 },

	{ 0x05570d, 26 },

	{ 0x059feb, 27 },

	{ 0x05bf38, 28 },

	{ 0xffffff, 29 },

};



static const struct reg_val ofsm_init[] = {

static const struct reg_val ofsm_init[] = {

	{ 0x800051, 0x01 },

	{ 0x800051, 0x01 },

	{ 0x800070, 0x0a },

	{ 0x800070, 0x0a },