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+/* GSM utility functions, e.g. coding and decoding */
+/*
+ * (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef GSM_UTILS_H
+#define GSM_UTILS_H
+
+#include <stdint.h>
+
+#define ADD_MODULO(sum, delta, modulo) do { \
+ if ((sum += delta) >= modulo) \
+ sum -= modulo; \
+ } while (0)
+
+#define GSM_MAX_FN (26*51*2048)
+
+struct gsm_time {
+ uint32_t fn; /* FN count */
+ uint16_t t1; /* FN div (26*51) */
+ uint8_t t2; /* FN modulo 26 */
+ uint8_t t3; /* FN modulo 51 */
+ uint8_t tc;
+};
+
+enum gsm_band {
+ GSM_BAND_850 = 1,
+ GSM_BAND_900 = 2,
+ GSM_BAND_1800 = 4,
+ GSM_BAND_1900 = 8,
+ GSM_BAND_450 = 0x10,
+ GSM_BAND_480 = 0x20,
+ GSM_BAND_750 = 0x40,
+ GSM_BAND_810 = 0x80,
+};
+
+const char *gsm_band_name(enum gsm_band band);
+enum gsm_band gsm_band_parse(const char *mhz);
+
+int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length);
+int gsm_7bit_encode(uint8_t *result, const char *data);
+
+int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
+int ms_pwr_dbm(enum gsm_band band, uint8_t lvl);
+
+/* According to TS 08.05 Chapter 8.1.4 */
+int rxlev2dbm(uint8_t rxlev);
+uint8_t dbm2rxlev(int dbm);
+
+/* According to GSM 04.08 Chapter 10.5.1.6 */
+static inline int ms_cm2_a5n_support(uint8_t *cm2, int n) {
+ switch (n) {
+ case 0: return 1;
+ case 1: return (cm2[0] & (1<<3)) ? 0 : 1;
+ case 2: return (cm2[2] & (1<<0)) ? 1 : 0;
+ case 3: return (cm2[2] & (1<<1)) ? 1 : 0;
+ default:
+ return 0;
+ }
+}
+
+/* According to GSM 04.08 Chapter 10.5.2.29 */
+static inline int rach_max_trans_val2raw(int val) { return (val >> 1) & 3; }
+static inline int rach_max_trans_raw2val(int raw) {
+ const int tbl[4] = { 1, 2, 4, 7 };
+ return tbl[raw & 3];
+}
+
+#define ARFCN_PCS 0x8000
+#define ARFCN_UPLINK 0x4000
+#define ARFCN_FLAG_MASK 0xf000 /* Reserve the upper 5 bits for flags */
+
+enum gsm_band gsm_arfcn2band(uint16_t arfcn);
+
+/* Convert an ARFCN to the frequency in MHz * 10 */
+uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink);
+
+/* Convert from frame number to GSM time */
+void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn);
+
+/* Convert from GSM time to frame number */
+uint32_t gsm_gsmtime2fn(struct gsm_time *time);
+
+/* GSM TS 03.03 Chapter 2.6 */
+enum gprs_tlli_type {
+ TLLI_LOCAL,
+ TLLI_FOREIGN,
+ TLLI_RANDOM,
+ TLLI_AUXILIARY,
+ TLLI_RESERVED,
+};
+
+/* TS 03.03 Chapter 2.6 */
+int gprs_tlli_type(uint32_t tlli);
+
+uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type);
+
+#endif