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V4L/DVB (7674): tda10048: Adding an SNR table

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Trying to improve the SNR reporting.

Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Steven Toth 2008-04-22 22:52:01 -03:00 committed by Mauro Carvalho Chehab
parent 6676237398
commit d5b3d9ff36
1 changed files with 147 additions and 10 deletions
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157
drivers/media/dvb/frontends/tda10048.c
View file

@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "dvb_math.h"
#include "tda10048.h"
#define TDA10048_DEFAULT_FIRMWARE "dvb-fe-tda10048-1.0.fw"
@ -563,31 +564,167 @@ static int tda10048_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
{
struct tda10048_state *state = fe->demodulator_priv;
u16 v;
u8 v;
dprintk(1, "%s()\n", __func__);
*signal_strength = 65535;
v = tda10048_readreg(state, TDA10048_NP_OUT);
if (v == 0)
*signal_strength = 100;
else {
/* TODO: Apply .db math for correct values */
*signal_strength = v;
}
if (v > 0)
*signal_strength -= (v << 8) | v;
return 0;
}
/* SNR lookup table */
static struct snr_tab {
u8 val;
u8 data;
} snr_tab[] = {
{ 0, 0 },
{ 1, 246 },
{ 2, 215 },
{ 3, 198 },
{ 4, 185 },
{ 5, 176 },
{ 6, 168 },
{ 7, 161 },
{ 8, 155 },
{ 9, 150 },
{ 10, 146 },
{ 11, 141 },
{ 12, 138 },
{ 13, 134 },
{ 14, 131 },
{ 15, 128 },
{ 16, 125 },
{ 17, 122 },
{ 18, 120 },
{ 19, 118 },
{ 20, 115 },
{ 21, 113 },
{ 22, 111 },
{ 23, 109 },
{ 24, 107 },
{ 25, 106 },
{ 26, 104 },
{ 27, 102 },
{ 28, 101 },
{ 29, 99 },
{ 30, 98 },
{ 31, 96 },
{ 32, 95 },
{ 33, 94 },
{ 34, 92 },
{ 35, 91 },
{ 36, 90 },
{ 37, 89 },
{ 38, 88 },
{ 39, 86 },
{ 40, 85 },
{ 41, 84 },
{ 42, 83 },
{ 43, 82 },
{ 44, 81 },
{ 45, 80 },
{ 46, 79 },
{ 47, 78 },
{ 48, 77 },
{ 49, 76 },
{ 50, 76 },
{ 51, 75 },
{ 52, 74 },
{ 53, 73 },
{ 54, 72 },
{ 56, 71 },
{ 57, 70 },
{ 58, 69 },
{ 60, 68 },
{ 61, 67 },
{ 63, 66 },
{ 64, 65 },
{ 66, 64 },
{ 67, 63 },
{ 68, 62 },
{ 69, 62 },
{ 70, 61 },
{ 72, 60 },
{ 74, 59 },
{ 75, 58 },
{ 77, 57 },
{ 79, 56 },
{ 81, 55 },
{ 83, 54 },
{ 85, 53 },
{ 87, 52 },
{ 89, 51 },
{ 91, 50 },
{ 93, 49 },
{ 95, 48 },
{ 97, 47 },
{ 100, 46 },
{ 102, 45 },
{ 104, 44 },
{ 107, 43 },
{ 109, 42 },
{ 112, 41 },
{ 114, 40 },
{ 117, 39 },
{ 120, 38 },
{ 123, 37 },
{ 125, 36 },
{ 128, 35 },
{ 131, 34 },
{ 134, 33 },
{ 138, 32 },
{ 141, 31 },
{ 144, 30 },
{ 147, 29 },
{ 151, 28 },
{ 154, 27 },
{ 158, 26 },
{ 162, 25 },
{ 165, 24 },
{ 169, 23 },
{ 173, 22 },
{ 177, 21 },
{ 181, 20 },
{ 186, 19 },
{ 190, 18 },
{ 194, 17 },
{ 199, 16 },
{ 204, 15 },
{ 208, 14 },
{ 213, 13 },
{ 218, 12 },
{ 223, 11 },
{ 229, 10 },
{ 234, 9 },
{ 239, 8 },
{ 245, 7 },
{ 251, 6 },
{ 255, 5 },
};
static int tda10048_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct tda10048_state *state = fe->demodulator_priv;
u8 v;
int i, ret = -EINVAL;
dprintk(1, "%s()\n", __func__);
/* TODO: This result should be the same as signal strength */
*snr = tda10048_readreg(state, TDA10048_NP_OUT);
v = tda10048_readreg(state, TDA10048_NP_OUT);
for (i = 0; i < ARRAY_SIZE(snr_tab); i++) {
if (v <= snr_tab[i].val) {
*snr = snr_tab[i].data;
ret = 0;
break;
}
}
return 0;
return ret;
}
static int tda10048_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)