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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: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-04-01 12:50:02 -03:00 committed by Mauro Carvalho Chehab
parent 3a871ca270
commit e898ef6272
2 changed files with 146 additions and 1 deletions
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49
drivers/media/dvb/frontends/af9033.c
View File

@ -540,9 +540,56 @@ err:
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;
err:
pr_debug("%s: failed=%d\n", __func__, ret);
return ret;
}
static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)

98
drivers/media/dvb/frontends/af9033_priv.h
View File

@ -47,6 +47,11 @@ struct clock_adc {
u32 adc;
};
struct val_snr {
u32 val;
u8 snr;
};
/* Xtal clock vs. ADC clock lookup table */
static const struct clock_adc clock_adc_lut[] = {
{ 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[] = {
{ 0x800051, 0x01 },
{ 0x800070, 0x0a },