Harald Welte | ec8b450 | 2010-02-20 20:34:29 +0100 | [diff] [blame] | 1 | /* GSM utility functions, e.g. coding and decoding */ |
| 2 | /* |
| 3 | * (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de> |
| 4 | * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
Harald Welte | aebe08c | 2010-03-04 10:39:17 +0100 | [diff] [blame] | 5 | * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | ec8b450 | 2010-02-20 20:34:29 +0100 | [diff] [blame] | 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #ifndef GSM_UTILS_H |
| 26 | #define GSM_UTILS_H |
| 27 | |
| 28 | #include <stdint.h> |
| 29 | |
Sylvain Munaut | 221030f | 2010-04-27 21:48:40 +0200 | [diff] [blame] | 30 | #define ADD_MODULO(sum, delta, modulo) do { \ |
| 31 | if ((sum += delta) >= modulo) \ |
| 32 | sum -= modulo; \ |
| 33 | } while (0) |
| 34 | |
| 35 | #define GSM_MAX_FN (26*51*2048) |
| 36 | |
Harald Welte | 622b718 | 2010-03-07 17:50:21 +0100 | [diff] [blame] | 37 | struct gsm_time { |
| 38 | uint32_t fn; /* FN count */ |
| 39 | uint16_t t1; /* FN div (26*51) */ |
| 40 | uint8_t t2; /* FN modulo 26 */ |
| 41 | uint8_t t3; /* FN modulo 51 */ |
| 42 | uint8_t tc; |
| 43 | }; |
| 44 | |
Harald Welte | ec8b450 | 2010-02-20 20:34:29 +0100 | [diff] [blame] | 45 | enum gsm_band { |
| 46 | GSM_BAND_850 = 1, |
| 47 | GSM_BAND_900 = 2, |
| 48 | GSM_BAND_1800 = 4, |
| 49 | GSM_BAND_1900 = 8, |
| 50 | GSM_BAND_450 = 0x10, |
| 51 | GSM_BAND_480 = 0x20, |
| 52 | GSM_BAND_750 = 0x40, |
| 53 | GSM_BAND_810 = 0x80, |
| 54 | }; |
| 55 | |
Harald Welte | cbc8062 | 2010-03-22 08:28:44 +0800 | [diff] [blame] | 56 | const char *gsm_band_name(enum gsm_band band); |
Harald Welte | aebe08c | 2010-03-04 10:39:17 +0100 | [diff] [blame] | 57 | enum gsm_band gsm_band_parse(const char *mhz); |
| 58 | |
Harald Welte | ec8b450 | 2010-02-20 20:34:29 +0100 | [diff] [blame] | 59 | int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length); |
| 60 | int gsm_7bit_encode(uint8_t *result, const char *data); |
| 61 | |
| 62 | int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm); |
| 63 | int ms_pwr_dbm(enum gsm_band band, uint8_t lvl); |
| 64 | |
| 65 | /* According to TS 08.05 Chapter 8.1.4 */ |
| 66 | int rxlev2dbm(uint8_t rxlev); |
| 67 | uint8_t dbm2rxlev(int dbm); |
| 68 | |
| 69 | /* According to GSM 04.08 Chapter 10.5.2.29 */ |
| 70 | static inline int rach_max_trans_val2raw(int val) { return (val >> 1) & 3; } |
| 71 | static inline int rach_max_trans_raw2val(int raw) { |
| 72 | const int tbl[4] = { 1, 2, 4, 7 }; |
| 73 | return tbl[raw & 3]; |
| 74 | } |
| 75 | |
Harald Welte | 622b718 | 2010-03-07 17:50:21 +0100 | [diff] [blame] | 76 | #define ARFCN_PCS 0x8000 |
| 77 | #define ARFCN_UPLINK 0x4000 |
| 78 | |
| 79 | enum gsm_band gsm_arfcn2band(uint16_t arfcn); |
| 80 | |
| 81 | /* Convert an ARFCN to the frequency in MHz * 10 */ |
| 82 | uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink); |
| 83 | |
| 84 | /* Convert from frame number to GSM time */ |
| 85 | void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn); |
| 86 | |
| 87 | /* Convert from GSM time to frame number */ |
| 88 | uint32_t gsm_gsmtime2fn(struct gsm_time *time); |
| 89 | |
Harald Welte | a1c4f76 | 2010-05-01 11:59:42 +0200 | [diff] [blame] | 90 | /* GSM TS 03.03 Chapter 2.6 */ |
| 91 | enum gprs_tlli_tyoe { |
| 92 | TLLI_LOCAL, |
| 93 | TLLI_FOREIGN, |
| 94 | TLLI_RANDOM, |
| 95 | TLLI_AUXILIARY, |
| 96 | TLLI_RESERVED, |
| 97 | }; |
| 98 | |
| 99 | /* TS 03.03 Chapter 2.6 */ |
| 100 | int gprs_tlli_type(uint32_t tlli); |
| 101 | |
Harald Welte | ec8b450 | 2010-02-20 20:34:29 +0100 | [diff] [blame] | 102 | void generate_backtrace(); |
| 103 | #endif |