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authorSteven Toth <stoth@hauppauge.com>2008-04-22 22:52:01 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-04-24 14:09:45 -0300
commitd5b3d9ff368dee5e87d9987161ff258d87ecc7c0 (patch)
tree0a8a7e9eee5dedeec1f92ff2f52ebf8a29b1411b /drivers/media/dvb/frontends/tda10048.c
parent6676237398d0c2e61e5a3a27e0951f60d6ef6fe3 (diff)
V4L/DVB (7674): tda10048: Adding an SNR table
Trying to improve the SNR reporting. Signed-off-by: Steven Toth <stoth@hauppauge.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/dvb/frontends/tda10048.c')
-rw-r--r--drivers/media/dvb/frontends/tda10048.c157
1 files changed, 147 insertions, 10 deletions
diff --git a/drivers/media/dvb/frontends/tda10048.c b/drivers/media/dvb/frontends/tda10048.c
index 701dd02b0d07..090fb7dd93c6 100644
--- a/drivers/media/dvb/frontends/tda10048.c
+++ b/drivers/media/dvb/frontends/tda10048.c
@@ -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)