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#pragma once
/*
* (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Eric Wild <ewild@sysmocom.de>
*
* 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 Affero 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 <string>
#include <tuple>
#include "Logger.h"
extern "C" {
#include <osmocom/gsm/gsm_utils.h>
}
template <typename powermapt, typename devmapt>
class band_manager {
using powerkeyt = typename powermapt::key_type;
using powermappedt = typename powermapt::mapped_type;
using devkeyt = typename devmapt::key_type;
devkeyt m_dev_type;
const powermapt &m_power_map;
const devmapt &m_dev_map;
powerkeyt m_fallback;
enum gsm_band m_band;
powermappedt m_band_desc;
bool band_ass_curr_sess{}; /* true if "band" was set after last POWEROFF */
// looks up either first tuple element (->enum) or straight enum
template <typename T, typename std::enable_if<std::is_enum<T>::value>::type *dummy = nullptr>
auto key_helper(T &t) -> T
{
return t;
}
template <typename T>
auto key_helper(T t) -> typename std::tuple_element<0, T>::type
{
return std::get<0>(t);
}
void assign_band_desc(enum gsm_band req_band)
{
auto key = key_helper(m_dev_type);
auto fallback_key = key_helper(m_fallback);
auto it = m_power_map.find({ key, req_band });
if (it == m_power_map.end()) {
auto desc = m_dev_map.at(m_dev_type);
LOGC(DDEV, ERROR) << "No Tx Power measurements exist for device " << desc.desc_str
<< " on band " << gsm_band_name(req_band) << ", using fallback..";
it = m_power_map.find({ fallback_key, req_band });
}
OSMO_ASSERT(it != m_power_map.end());
m_band_desc = it->second;
}
bool set_band(enum gsm_band req_band)
{
if (band_ass_curr_sess && req_band != m_band) {
LOGC(DDEV, ALERT) << "Requesting band " << gsm_band_name(req_band)
<< " different from previous band " << gsm_band_name(m_band);
return false;
}
if (req_band != m_band) {
m_band = req_band;
assign_band_desc(m_band);
}
band_ass_curr_sess = true;
return true;
}
public:
band_manager(const devkeyt &dev_type, const powermapt &power_map, const devmapt &dev_map, powerkeyt fallback)
: m_dev_type(dev_type), m_power_map(power_map), m_dev_map(dev_map), m_fallback(fallback),
m_band((enum gsm_band)0)
{
}
band_manager(const powermapt &power_map, const devmapt &dev_map)
: m_dev_type(dev_map.begin()->first), m_power_map(power_map), m_dev_map(dev_map),
m_fallback(m_power_map.begin()->first), m_band((enum gsm_band)0)
{
}
void band_reset()
{
band_ass_curr_sess = false;
}
void update_band_dev(devkeyt dev_type) {
m_dev_type = dev_type;
}
void get_dev_band_desc(powermappedt &desc)
{
if (m_band == 0) {
LOGC(DDEV, ERROR)
<< "Power parameters requested before Tx Frequency was set! Providing band 900 by default...";
assign_band_desc(GSM_BAND_900);
}
desc = m_band_desc;
}
bool update_band_from_freq(double wFreq, int chan, bool is_tx)
{
enum gsm_band req_band;
auto dirstr = is_tx ? "Tx" : "Rx";
auto req_arfcn = gsm_freq102arfcn(wFreq / 1000 / 100, !is_tx);
if (req_arfcn == 0xffff) {
LOGCHAN(chan, DDEV, ALERT)
<< "Unknown ARFCN for " << dirstr << " Frequency " << wFreq / 1000 << " kHz";
return false;
}
if (gsm_arfcn2band_rc(req_arfcn, &req_band) < 0) {
LOGCHAN(chan, DDEV, ALERT) << "Unknown GSM band for " << dirstr << " Frequency " << wFreq
<< " Hz (ARFCN " << req_arfcn << " )";
return false;
}
return set_band(req_band);
}
};
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