From eeb78dde9b037d6b26325e6e5b9154a91952ced9 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Tue, 2 Aug 2011 13:44:54 +0200
Subject: [PATCH] add new 'osmo-arfcn' program to compute frequency based on
 arfcn

The freq -> arfcn side still needs to be implemented.
---
 Makefile.am        |   2 +-
 configure.ac       |   1 +
 utils/Makefile.am  |   5 +++
 utils/osmo-arfcn.c | 103 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 utils/Makefile.am
 create mode 100644 utils/osmo-arfcn.c

diff --git a/Makefile.am b/Makefile.am
index 03bfdece4..d7a8fb771 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,7 +2,7 @@ AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 ACLOCAL_AMFLAGS = -I m4
 
 INCLUDES = $(all_includes) -I$(top_srcdir)/include
-SUBDIRS = include src tests
+SUBDIRS = include src tests utils
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libosmocore.pc libosmocodec.pc libosmovty.pc libosmogsm.pc
diff --git a/configure.ac b/configure.ac
index b923a218f..0ee8aa63a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -120,4 +120,5 @@ AC_OUTPUT(
 	tests/msgfile/Makefile
 	tests/ussd/Makefile
 	tests/smscb/Makefile
+	utils/Makefile
 	Makefile)
diff --git a/utils/Makefile.am b/utils/Makefile.am
new file mode 100644
index 000000000..645cfd545
--- /dev/null
+++ b/utils/Makefile.am
@@ -0,0 +1,5 @@
+INCLUDES = $(all_includes) -I$(top_srcdir)/include
+noinst_PROGRAMS = osmo-arfcn
+
+osmo_arfcn_SOURCES = osmo-arfcn.c
+osmo_arfcn_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gsm/libosmogsm.la
diff --git a/utils/osmo-arfcn.c b/utils/osmo-arfcn.c
new file mode 100644
index 000000000..15adbca26
--- /dev/null
+++ b/utils/osmo-arfcn.c
@@ -0,0 +1,103 @@
+/* Utility program for ARFCN / frequency calculations */
+/*
+ * (C) 2011 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.
+ *
+ */
+
+#include <stdio.h>
+#include <getopt.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+
+enum program_mode {
+	MODE_NONE,
+	MODE_A2F,
+	MODE_F2A,
+};
+
+static int arfcn2freq(char *arfcn_str)
+{
+	int arfcn = atoi(arfcn_str);
+	uint16_t freq10u, freq10d;
+
+	if (arfcn < 0 || arfcn > 0xffff) {
+		fprintf(stderr, "Invalid ARFCN %d\n", arfcn);
+		return -EINVAL;
+	}
+
+	freq10u = gsm_arfcn2freq10(arfcn, 1);
+	freq10d = gsm_arfcn2freq10(arfcn, 0);
+	if (freq10u == 0xffff || freq10d == 0xffff) {
+		fprintf(stderr, "Error during conversion of ARFCN %d\n",
+			arfcn);
+		return -EINVAL;
+	}
+
+	printf("ARFCN %4d: Uplink %4u.%1u MHz / Downlink %4u.%1u MHz\n",
+		arfcn, freq10u/10, freq10u%10, freq10d/10, freq10d%10);
+
+	return 0;
+}
+
+static void help(const char *progname)
+{
+	printf("Usage: %s [-h] [-a arfcn] [-f freq] [-u|-d]\n",
+		progname);
+}
+
+int main(int argc, char **argv)
+{
+	int opt;
+	char *param;
+	enum program_mode mode = MODE_NONE;
+
+	while ((opt = getopt(argc, argv, "a:f:ud")) != -1) {
+		switch (opt) {
+		case 'a':
+			mode = MODE_A2F;
+			param = optarg;
+			break;
+		case 'f':
+			mode = MODE_F2A;
+			param = optarg;
+			break;
+		case 'h':
+			help(argv[0]);
+			exit(0);
+			break;
+		default:
+			break;
+		}
+	}
+
+	switch (mode) {
+	case MODE_NONE:
+		help(argv[0]);
+		exit(2);
+		break;
+	case MODE_A2F:
+		arfcn2freq(param);
+		break;
+	}
+
+	exit(0);
+}