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Commit d5b3d9ff authored by Steven Toth's avatar Steven Toth Committed by Mauro Carvalho Chehab
Browse files

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



Trying to improve the SNR reporting.

Signed-off-by: default avatarSteven Toth <stoth@hauppauge.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 66762373

drivers/media/dvb/frontends/tda10048.c

+147 −10
Original line number Diff line number Diff line
@@ -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)