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/*
* Helper utilities that are used in OML
*
* (C) 2011-2013 by Harald Welte <laforge@gnumonks.org>
* (C) 2013 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "utils.h"
#include <osmo-bts/bts.h>
#include <osmo-bts/gsm_data.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/oml.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include "femtobts.h"
#include "l1_if.h"
int band_femto2osmo(GsmL1_FreqBand_t band)
{
switch (band) {
case GsmL1_FreqBand_850:
return GSM_BAND_850;
case GsmL1_FreqBand_900:
return GSM_BAND_900;
case GsmL1_FreqBand_1800:
return GSM_BAND_1800;
case GsmL1_FreqBand_1900:
return GSM_BAND_1900;
default:
return -1;
}
}
static int band_osmo2femto(struct gsm_bts_trx *trx, enum gsm_band osmo_band)
{
struct femtol1_hdl *fl1h = trx_femtol1_hdl(trx);
/* check if the TRX hardware actually supports the given band */
if (!(fl1h->hw_info.band_support & osmo_band))
return -1;
/* if yes, convert from osmcoom style band definition to L1 band */
switch (osmo_band) {
case GSM_BAND_850:
return GsmL1_FreqBand_850;
case GSM_BAND_900:
return GsmL1_FreqBand_900;
case GSM_BAND_1800:
return GsmL1_FreqBand_1800;
case GSM_BAND_1900:
return GsmL1_FreqBand_1900;
default:
return -1;
}
}
/**
* Select the band that matches the ARFCN. In general the ARFCNs
* for GSM1800 and GSM1900 overlap and one needs to specify the
* rightband. When moving between GSM900/GSM1800 and GSM850/1900
* modifying the BTS configuration is a bit annoying. The auto-band
* configuration allows to ease with this transition.
*/
int sysmobts_select_femto_band(struct gsm_bts_trx *trx, uint16_t arfcn)
{
enum gsm_band band;
struct gsm_bts *bts = trx->bts;
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
if (!btsb->auto_band)
return band_osmo2femto(trx, bts->band);
/*
* We need to check what will happen now.
*/
band = gsm_arfcn2band(arfcn);
/* if we are already on the right band return */
if (band == bts->band)
return band_osmo2femto(trx, bts->band);
/* Check if it is GSM1800/GSM1900 */
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900)
return band_osmo2femto(trx, bts->band);
/*
* Now to the actual autobauding. We just want DCS/DCS and
* PCS/PCS for PCS we check for 850/1800 though
*/
if ((band == GSM_BAND_900 && bts->band == GSM_BAND_1800)
|| (band == GSM_BAND_1800 && bts->band == GSM_BAND_900)
|| (band == GSM_BAND_850 && bts->band == GSM_BAND_1900))
return band_osmo2femto(trx, band);
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_850)
return band_osmo2femto(trx, GSM_BAND_1900);
/* give up */
return -1;
}
int sysmobts_get_nominal_power(struct gsm_bts_trx *trx)
{
struct femtol1_hdl *fl1h = trx_femtol1_hdl(trx);
switch (fl1h->hw_info.model_nr) {
case 0:
case 0xffff:
/* old units have empty flash where the model number is
* stored in later units */
case 1002:
/* 200mW (23 dBm) nominal power */
return 23;
case 2050:
/* 5W(39dBm) per TRX. This could be raiesd to 10W(40dBm)
* if the second TRX is not used. */
return 37;
default:
LOGP(DL1C, LOGL_ERROR, "Model number %u/0x%x not known.\n",
fl1h->hw_info.model_nr, fl1h->hw_info.model_nr);
break;
}
return -1;
}
int sysmobts_get_power_trx(struct gsm_bts_trx *trx)
{
int power_transmitter = trx->nominal_power - trx->max_power_red;
power_transmitter -= trx->power_reduce;
if (power_transmitter < 0)
power_transmitter = 0;
return power_transmitter;
}
void prepend_oml_ipa_header(struct msgb *msg)
{
struct ipaccess_head *hh;
hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
hh->proto = IPAC_PROTO_OML;
hh->len = htons(msg->len - sizeof(struct ipaccess_head));
}
int check_ipa_header(struct msgb *msg)
{
struct ipaccess_head *hh;
if (msg->len < sizeof(struct ipaccess_head)) {
LOGP(DL1C, LOGL_ERROR, "Ipa header insufficient space %d %d\n",
msg->len, sizeof(struct ipaccess_head));
return -1;
}
hh = (struct ipaccess_head *)msg->data;
if (hh->proto != IPAC_PROTO_OML) {
LOGP(DL1C, LOGL_ERROR, "Incorrect ipa header protocol %x %x\n",
hh->proto, IPAC_PROTO_OML);
return -1;
}
if (ntohs(hh->len) != msg->len - sizeof(struct ipaccess_head)) {
LOGP(DL1C, LOGL_ERROR, "Incorrect ipa header msg size %d %d\n",
ntohs(hh->len), msg->len - sizeof(struct ipaccess_head));
return -1;
}
return 0;
}
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