diff options
author | Steven Toth <stoth@hauppauge.com> | 2008-04-22 22:52:01 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-04-24 14:09:45 -0300 |
commit | d5b3d9ff368dee5e87d9987161ff258d87ecc7c0 (patch) | |
tree | 0a8a7e9eee5dedeec1f92ff2f52ebf8a29b1411b /drivers/media | |
parent | 6676237398d0c2e61e5a3a27e0951f60d6ef6fe3 (diff) | |
download | linux-d5b3d9ff368dee5e87d9987161ff258d87ecc7c0.tar.gz |
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')
-rw-r--r-- | drivers/media/dvb/frontends/tda10048.c | 157 |
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) |