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gnuradio.cc

/* -*- Mode: c++ -*- */
/*
 *  Hamlib GNUradio backend - main file
 *  Copyright (c) 2001-2004 by Stephane Fillod
 *
 *    $Id: gnuradio.cc,v 1.9 2004/05/17 21:09:43 fillods Exp $
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library 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 Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/*
 * Simple backend of a chirp source.
 */

#include <VrSigSource.h>
#include <GrAudioSource.h>
#include <VrFileSource.h>
#include <VrNullSink.h>
#include <GrAudioSink.h>
#include <VrFileSink.h>

#include <make_GrMC4020Source.h>
#include <VrFixOffset.h>
#include <GrConvertSF.h>

#include <VrConnect.h>
#include <VrMultiTask.h>


/* Demodulator chains */
#include <nfm.h>
#include <am.h>
#include <ssb.h>
#include <wfm.h>



/* Chirp param's */
#define CARRIER_FREQ                        1.070e6   // AM 1070
#define AMPLITUDE                   3000

#define AUDIO_SINK      "/dev/dsp"
#define AUDIO_SRC "/dev/dsp1"

#include <stdlib.h>
#include <stdio.h>   /* Standard input/output definitions */
#include <string.h>  /* String function definitions */
#include <unistd.h>  /* UNIX standard function definitions */
#include <fcntl.h>   /* File control definitions */
#include <errno.h>   /* Error number definitions */
#include <sys/ioctl.h>
#include <math.h>
#include <pthread.h>

#include <hamlib/rig.h>
#include <misc.h>
#include <token.h>
#include <register.h>

#include "gnuradio.h"
#include "gr_priv.h"    // struct gnuradio_priv_data


/*
 * TODO: fft scope, with ext_level to display them
 */

#define TOK_TUNER_MODEL TOKEN_BACKEND(1)

const struct confparams gnuradio_cfg_params[] = {
      { TOK_TUNER_MODEL, "tuner_model", "Tuner model", "Hamlib rig tuner model number",
            "1" /* RIG_MODEL_DUMMY */, RIG_CONF_NUMERIC, { /* .n = */ { 0, INT_MAX, 1 } }
      },
      /*
       * TODO: IF_center_freq, input_rate, etc.
       */
      { RIG_CONF_END, NULL, }
};

static void init_chan(RIG *rig, vfo_t vfo, channel_t *chan)
{
  chan->channel_num = 0;
  chan->vfo = vfo;
  strcpy(chan->channel_desc, rig_strvfo(vfo));

  chan->freq = RIG_FREQ_NONE;
  chan->mode = RIG_MODE_NONE;
  chan->width = 0;
  chan->tx_freq = chan->freq;
  chan->tx_mode = chan->mode;
  chan->tx_width = chan->width;
  chan->split = RIG_SPLIT_OFF;

  chan->rptr_shift = RIG_RPT_SHIFT_NONE;
  chan->rptr_offs = 0;
  chan->ctcss_tone = 0;
  chan->dcs_code = 0;
  chan->ctcss_sql = 0;
  chan->dcs_sql = 0;
  chan->rit = 0;
  chan->xit = 0;
  chan->tuning_step = 0;
  chan->ant = 0;

  chan->funcs = (setting_t)0;
  memset(chan->levels, 0, RIG_SETTING_MAX*sizeof(value_t));
}

int gr_init(RIG *rig)
{
  struct gnuradio_priv_data *priv;
  const struct gnuradio_priv_caps *priv_caps = (const struct gnuradio_priv_caps*)rig->caps->priv;
  int i;

  priv = (struct gnuradio_priv_data*)malloc(sizeof(struct gnuradio_priv_data));
  if (!priv)
        return -RIG_ENOMEM;
  rig->state.priv = (void*)priv;

  rig_debug(RIG_DEBUG_VERBOSE,"%s called\n", __FUNCTION__ );
  rig->state.rigport.type.rig = RIG_PORT_NONE;

  memset(priv->parms, 0, RIG_SETTING_MAX*sizeof(value_t));

  priv->m = NULL;
  priv->sink = NULL;
  priv->source = NULL;

  for (i=0; i<NUM_CHAN; i++) {
      init_chan(rig, RIG_VFO_N(i), &priv->chans[i]);
      priv->chans[i].levels[rig_setting2idx(RIG_LEVEL_AF)].f = 1.0;
      priv->chans[i].levels[rig_setting2idx(RIG_LEVEL_RF)].f = 1.0;
  }
  priv->curr_vfo = RIG_VFO_A;

  priv->tuner_model = priv_caps->tuner_model;
  priv->input_rate = priv_caps->input_rate;
  priv->IF_center_freq = priv_caps->IF_center_freq;

  pthread_mutex_init(&priv->mutex_process, NULL);

  return RIG_OK;
}


/*
 * Assumes rig!=NULL, rig->state.priv!=NULL
 */
int gnuradio_set_conf(RIG *rig, token_t token, const char *val)
{
      struct gnuradio_priv_data *priv;
      struct rig_state *rs;

      rs = &rig->state;
      priv = (struct gnuradio_priv_data*)rs->priv;

      switch(token) {
      case TOK_TUNER_MODEL:
            priv->tuner_model = atoi(val);
            break;
      default:
            /* if it's not for the gnuradio backend, maybe it's for the tuner */
            return rig_set_conf(priv->tuner, token, val);
      }
      return RIG_OK;
}

/*
 * assumes rig!=NULL,
 * Assumes rig!=NULL, rig->state.priv!=NULL
 *  and val points to a buffer big enough to hold the conf value.
 */
int gnuradio_get_conf(RIG *rig, token_t token, char *val)
{
      struct gnuradio_priv_data *priv;
      struct rig_state *rs;

      rs = &rig->state;
      priv = (struct gnuradio_priv_data*)rs->priv;

      switch(token) {
      case TOK_TUNER_MODEL:
            sprintf(val, "%d", priv->tuner_model);
            break;
      default:
            /* if it's not for the gnuradio backend, maybe it's for the tuner */
            return rig_get_conf(priv->tuner, token, val);
      }
      return RIG_OK;
}

/*
 * GNUradio process thread
 *
 * the thread is _created_ with priv->mutex_process held
 *
 * TODO: change process name to give a hint about this CPU hungry process
 *    also shouldn't we block couple of disturbing signals?
 */
static void *gnuradio_process(void *arg)
{
      RIG *rig = (RIG *)arg;
      struct gnuradio_priv_data *priv;

      priv = (struct gnuradio_priv_data*)rig->state.priv;

      /* the mutex lock is not to gurantee reentrancy of rig_debug,
       * this is just to know when backend want us start running
       */
      pthread_mutex_lock(&priv->mutex_process);
      rig_debug(RIG_DEBUG_TRACE,"gnuradio process thread started\n");
      pthread_mutex_unlock(&priv->mutex_process);

      while (priv->do_process) {
            pthread_mutex_lock(&priv->mutex_process);
            priv->m->process();
            pthread_mutex_unlock(&priv->mutex_process);
      }
      return NULL;
}

int gr_open(RIG *rig)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;
  const struct gnuradio_priv_caps *priv_caps = (const struct gnuradio_priv_caps*)rig->caps->priv;
  int ret;


  rig_debug(RIG_DEBUG_VERBOSE,"%s called\n", __FUNCTION__);

  /*
   * make sure gnuradio's tuner is not gnuradio!
   */
  if (RIG_BACKEND_NUM(priv_caps->tuner_model) == RIG_GNURADIO) {
        return -RIG_ECONF;
  }

  priv->tuner = rig_init(priv->tuner_model);
  if (!priv->tuner) {
        /* FIXME: wrong rig model? */
        return -RIG_ENOMEM;
  }
  rig_open(priv->tuner);

  /* TODO:
   *  copy priv->tuner->rx_range/tx_range to rig->state, 
   *  and override available modes with gnuradio's
   */

  rig->state.has_set_func  |= priv->tuner->state.has_set_func;
  rig->state.has_get_func  |= priv->tuner->state.has_get_func;
  rig->state.has_set_level |= priv->tuner->state.has_set_level;
  rig->state.has_get_level |= priv->tuner->state.has_get_level;
  rig->state.has_set_parm  |= priv->tuner->state.has_set_parm;
  rig->state.has_get_parm  |= priv->tuner->state.has_get_parm;


  /* ** Source ** */
  
  // --> short

#if 0
  if (!priv->source) {
      priv->source = new VrFileSource<short>(priv->input_rate, "/tmp/fm95_5_half.dat", true);
  }
  // Chirp
  if (!priv->source)
      priv->source = new VrSigSource<IOTYPE>(priv->input_rate, VR_SIN_WAVE, CARRIER_FREQ, AMPLITUDE);
#endif
  //new VrChirpSource<IOTYPE>(priv->input_rate, AMPLITUDE, 4);
  /* VrFileSource (double sampling_freq, const char *file, bool repeat = false) */
  //priv->source = new VrFileSource<short>(priv->input_rate, "microtune_source.sw", true);

  priv->sink = new GrAudioSink<float>(1,AUDIO_SINK);

  /* ** Sink ** */
  if (!priv->sink)
      priv->sink = new VrNullSink<float>();
  //priv->sink = new VrFileSink<short>("microtune_audio.sw");

  priv->m = new VrMultiTask ();

  priv->m->start();

  if (priv->tuner_model == RIG_MODEL_DUMMY) {
        gr_set_freq(rig, RIG_VFO_CURR, priv->IF_center_freq);
  }

  priv->do_process = 1;

  pthread_mutex_lock(&priv->mutex_process);

  ret = pthread_create(&priv->process_thread, NULL, gnuradio_process, (void*)rig);

  pthread_mutex_unlock(&priv->mutex_process);

  if (ret != 0) {
        /* TODO: undo the close*/
        rig_debug(RIG_DEBUG_ERR, "%s: pthread_create failed: %s\n", __FUNCTION__, strerror(errno));
        return -RIG_ENOMEM;   /* huh? */
  }

  return RIG_OK;
}


/* TODO: error checking of new */
int mc4020_open(RIG *rig)
{
      struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;

      /* input sample rate from PCI-DAS4020/12: 20000000  */

      priv->mc4020_source = make_GrMC4020SourceS(priv->input_rate, MCC_CH3_EN | MCC_ALL_1V);

      // short --> short
      priv->offset_fixer = new VrFixOffset<short,short>();

      // short --> float
      priv->convert_SF = new GrConvertSF();

      NWO_CONNECT (priv->mc4020_source, priv->offset_fixer);
      NWO_CONNECT (priv->offset_fixer, priv->convert_SF);
      NWO_CONNECT (priv->convert_SF, priv->source);

      return gr_open(rig);
}


/*
 * graudio, mono
 * sound card source override
 */
int graudio_open(RIG *rig)
{
      struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;

      /*
       * assumes sound card is full duplex!
       * mono source
       */
      priv->source =  new GrAudioSource<VrComplex>(priv->input_rate, 1,1,AUDIO_SRC);

      return gr_open(rig);
}


/*
 * graudio I&Q, stereo
 * sound card source override
 */
int graudioiq_open(RIG *rig)
{
      struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;

      /*
       * assumes sound card is full duplex!
       * I&Q source
       */
      priv->source =  new GrAudioSource<VrComplex>(priv->input_rate, 2,1, AUDIO_SRC);

      return gr_open(rig);
}


int gr_close(RIG *rig)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;
  int ret;

  rig_debug(RIG_DEBUG_VERBOSE,"%s called\n", __FUNCTION__);

  priv->do_process = 0;
  pthread_mutex_lock(&priv->mutex_process);
  priv->m->stop();
  pthread_mutex_unlock(&priv->mutex_process);

  ret = pthread_join(priv->process_thread, NULL);
  if (ret != 0) {
        rig_debug(RIG_DEBUG_ERR, "%s: pthread_join failed: %s\n", __FUNCTION__, strerror(errno));
  }
  rig_debug(RIG_DEBUG_TRACE,"%s: process thread stopped\n", __FUNCTION__);

  delete priv->m;
  delete priv->sink;
  delete priv->source;

  priv->m = NULL;
  priv->sink = NULL;
  priv->source = NULL;

  rig_close(priv->tuner);

  return RIG_OK;
}

int gr_cleanup(RIG *rig)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data*)rig->state.priv;

  rig_debug(RIG_DEBUG_VERBOSE,"%s called\n", __FUNCTION__);

  rig_cleanup(priv->tuner);

  /* note: mutex must be unlocked! */
  pthread_mutex_destroy(&priv->mutex_process);

  if (rig->state.priv)
      free(rig->state.priv);

  rig->state.priv = NULL;

  return RIG_OK;
}

static int vfo2chan_num(RIG *rig, vfo_t vfo)
{
      struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;

      if (vfo == RIG_VFO_CURR)
            vfo = priv->curr_vfo;
      switch (vfo) {
      case RIG_VFO_A:
            return 0;
      case RIG_VFO_B:
            return 1;
      }
      rig_debug(RIG_DEBUG_WARN,"%s unknown vfo: %d\n", vfo);
      return 0;
}

/*
 * tuner_freq is the display freq on tuner of the IF in digital domain
 * freq is the desired freq
 */
static int update_freq(RIG *rig, unsigned chan_num, freq_t tuner_freq, freq_t freq)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  channel_t *chan = &priv->chans[chan_num];
  DemodChainCF *mod = priv->mods[chan_num];
  double freq_offset;

  if (chan->mode == RIG_MODE_NONE || !mod) {
      rig_debug(RIG_DEBUG_TRACE,"No (de)modulator for chan %d\n",chan_num);
      return RIG_OK;
  }

  /*
   * In case the tuner is not a real tuner
   */
  if (priv->tuner_model == RIG_MODEL_DUMMY)
        tuner_freq = priv->IF_center_freq;

  freq_offset = (double) (freq - tuner_freq);
  rig_debug(RIG_DEBUG_VERBOSE, "%s: tuner:%lld gr:%lld freq_offset=%g\n",
              __FUNCTION__, tuner_freq, freq, freq_offset);

  if (freq_offset == 0)
        return RIG_OK;  /* nothing to do */

  pthread_mutex_lock(&priv->mutex_process);

  /*
   * not so sure about if setCenter_Freq is the Right thing to do(tm).
   */
  mod->setFreq((freq_t)(priv->IF_center_freq + freq_offset));

  pthread_mutex_unlock(&priv->mutex_process);

  return RIG_OK;
}

/*
 * rig_set_freq is a good candidate for the GNUradio GUI setFrequency callback?
 */
int gr_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];
  freq_t tuner_freq;
  int ret, i;
  char fstr[20];

  sprintf_freq(fstr, freq);
  rig_debug(RIG_DEBUG_TRACE,"%s called: %s %s\n", 
                  __FUNCTION__, rig_strvfo(vfo), fstr);

  ret = rig_get_freq(priv->tuner, RIG_VFO_CURR, &tuner_freq);
  if (ret != RIG_OK)
        return ret;

  /* check if we're out of current IF window
   * TODO: with several VFO's, center the IF inbetween if out of window
   */
  if (freq < tuner_freq || 
              freq /* + mode_width */ > tuner_freq+GR_MAX_FREQUENCY(priv)) {
        /*
         * do not set tuner to freq, but center it
         */
#if 0
        if (GR_MAX_FREQUENCY(priv)/2 < mode_offset)
              tuner_freq = freq - mode_offset - resolution;
        else
#endif
              tuner_freq = freq - GR_MAX_FREQUENCY(priv)/2;
        ret = rig_set_freq(priv->tuner, RIG_VFO_CURR, tuner_freq);
        if (ret != RIG_OK)
              return ret;
        /*
         * query freq right back, because wanted freq may be rounded
         * because of the resolution of the tuner
         */
        ret = rig_get_freq(priv->tuner, RIG_VFO_CURR, &tuner_freq);
        if (ret != RIG_OK)
            return ret;

        /*
         * tuner freq changed, so adjust frequency offset of other channels
         */
        for (i = 0; i<NUM_CHAN; i++) {
              if (i != chan_num)
                  update_freq(rig, i, tuner_freq, priv->chans[i].freq);
        }
  }

  ret = update_freq(rig, chan_num, tuner_freq, freq);
  if (ret == RIG_OK)
      chan->freq = freq;

  return ret;
}


int gr_get_freq(RIG *rig, vfo_t vfo, freq_t *freq)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n", __FUNCTION__, rig_strvfo(vfo));

  *freq = chan->freq;

  return RIG_OK;
}


/*
 * WIP
 */
int gr_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];
  DemodChainCF *mod = priv->mods[chan_num];
  char buf[16];
  freq_t tuner_freq;
  int ret = RIG_OK;
  double freq_offset;

  if (width == RIG_PASSBAND_NORMAL)
        width = rig_passband_normal(rig, mode);
  sprintf_freq(buf, width);
  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s %s %s\n", 
            __FUNCTION__, rig_strvfo(vfo), rig_strrmode(mode), buf);

  if (mode == chan->mode && width == chan->width)
        return RIG_OK;


  ret = rig_get_freq(priv->tuner, RIG_VFO_CURR, &tuner_freq);
  if (ret != RIG_OK)
        return ret;
  /*
   * In case the tuner is not a real tuner
   */
  if (priv->tuner_model == RIG_MODEL_DUMMY)
        tuner_freq = 0;

  freq_offset = (double) (chan->freq - tuner_freq + priv->IF_center_freq);
  rig_debug(RIG_DEBUG_VERBOSE, "%s: freq_offset=%g tuner_freq=%lld, IFcenter=%ld\n",
              __FUNCTION__, freq_offset, tuner_freq, priv->IF_center_freq);




  pthread_mutex_lock(&priv->mutex_process);

  /* Same mode, but different width */
  if (mode != RIG_MODE_NONE && mode == chan->mode) {
      mod->setWidth(width);
      chan->width = width;
      pthread_mutex_unlock(&priv->mutex_process);
      return RIG_OK;
  }

  priv->m->stop();

  /* TODO: destroy GNUradio connections beforehand if different mode? */
  if (chan->mode != RIG_MODE_NONE && mode != chan->mode) {

      delete mod;
      priv->mods[chan_num] = NULL;

      delete priv->m;
      priv->m = new VrMultiTask ();
  }

  if (mode == RIG_MODE_NONE) {
        /* ez */
      chan->mode = mode;
      chan->width = width;
      pthread_mutex_unlock(&priv->mutex_process);
      return RIG_OK;
  }

  float rf_gain = chan->levels[rig_setting2idx(RIG_LEVEL_RF)].f;

  switch(mode) {
  case RIG_MODE_LSB:
      mod = new LSBDemodChainCF(priv->source, priv->sink, mode, width, priv->input_rate, (freq_t)freq_offset);
      break;
  case RIG_MODE_USB:
      mod = new USBDemodChainCF(priv->source, priv->sink, mode, width, priv->input_rate, (freq_t)freq_offset);
      break;
  case RIG_MODE_AM:
      mod = new AMDemodChainCF(priv->source, priv->sink, mode, width, priv->input_rate, (freq_t)freq_offset);
      break;
  case RIG_MODE_FM:
      mod = new FMDemodChainCF(priv->source, priv->sink, mode, width, priv->input_rate, (freq_t)freq_offset);
      break;
  case RIG_MODE_WFM:
      mod = new WFMDemodChainCF(priv->source, priv->sink, mode, width, priv->input_rate, (freq_t)freq_offset);
      break;
  default:
        ret = -RIG_EINVAL;
  }

  priv->mods[chan_num] = mod;

  /* wire up the chain */
  mod->connect();

  priv->m->add (priv->sink);
  priv->m->start();

  pthread_mutex_unlock(&priv->mutex_process);


  if (ret == RIG_OK) {
      chan->mode = mode;
      chan->width = width;
  }

  return ret;
}


int gr_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n", __FUNCTION__, rig_strvfo(vfo));

  *mode = chan->mode;
  *width = chan->width;

  return RIG_OK;
}


int gr_set_vfo(RIG *rig, vfo_t vfo)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;

  if (vfo == RIG_VFO_VFO || vfo == RIG_VFO_RX)
        return RIG_OK;

  if (vfo != RIG_VFO_A && vfo != RIG_VFO_B)
        return -RIG_EINVAL;

  priv->curr_vfo = vfo;
  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n", __FUNCTION__, rig_strvfo(vfo));

  return RIG_OK;
}


int gr_get_vfo(RIG *rig, vfo_t *vfo)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;

  *vfo = priv->curr_vfo;
  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n", __FUNCTION__, rig_strvfo(*vfo));

  return RIG_OK;
}

/*
 */
int gnuradio_set_level(RIG *rig, vfo_t vfo, setting_t level, value_t val)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];
  DemodChainCF *mod = priv->mods[chan_num];
  char lstr[32];
  int idx;
  int ret = RIG_OK;

  idx = rig_setting2idx(level);
  if (idx < RIG_SETTING_MAX)
      chan->levels[idx] = val;

  if (RIG_LEVEL_IS_FLOAT(level))
        sprintf(lstr, "%f", val.f);
  else
        sprintf(lstr, "%d", val.i);
  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s %s\n",__FUNCTION__, 
                          rig_strlevel(level), lstr);
  /* TODO: check val is in range */

  pthread_mutex_lock(&priv->mutex_process);

  switch (level) {
  case RIG_LEVEL_RF:
        /* line-in level of sound card, etc. */
      break;
  default:
      rig_debug(RIG_DEBUG_TRACE, "%s: level %s, try tuner\n",
                    __FUNCTION__, rig_strlevel(level));
      ret = rig_set_level(priv->tuner, vfo, level, val);
      break;
  }

  pthread_mutex_unlock(&priv->mutex_process);

  return ret;
}


int gnuradio_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];
  int idx;

  idx = rig_setting2idx(level);

  if (idx < RIG_SETTING_MAX)
      *val = chan->levels[idx];
  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n",__FUNCTION__, 
                          rig_strlevel(level));

  return RIG_OK;
}


/*
 * TODO: change BFO...
 */
int gnuradio_set_rit(RIG *rig, vfo_t vfo, shortfreq_t rit)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __FUNCTION__);

  chan->rit = rit;

  return RIG_OK;
}


int gnuradio_get_rit(RIG *rig, vfo_t vfo, shortfreq_t *rit)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  *rit = chan->rit;
  rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __FUNCTION__);

  return RIG_OK;
}


/*
 * nothing much to be done but remembering
 */
int gnuradio_set_ts(RIG *rig, vfo_t vfo, shortfreq_t ts)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __FUNCTION__);
  chan->tuning_step = ts;

  return RIG_OK;
}


int gnuradio_get_ts(RIG *rig, vfo_t vfo, shortfreq_t *ts)
{
  struct gnuradio_priv_data *priv = (struct gnuradio_priv_data *)rig->state.priv;
  int chan_num = vfo2chan_num(rig, vfo);
  channel_t *chan = &priv->chans[chan_num];

  rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __FUNCTION__);
  *ts = chan->tuning_step;

  return RIG_OK;
}


int gnuradio_vfo_op(RIG *rig, vfo_t vfo, vfo_op_t op)
{
  freq_t freq;
  shortfreq_t ts;
  int ret = RIG_OK;

  rig_debug(RIG_DEBUG_VERBOSE,"%s called: %s\n",__FUNCTION__, 
                          rig_strvfop(op));

  switch (op) {
  case RIG_OP_UP:
        ret = gr_get_freq(rig, vfo, &freq);
        if (ret != RIG_OK) break;
        ret = gnuradio_get_ts(rig, vfo, &ts);
        if (ret != RIG_OK) break;
        ret = gr_set_freq(rig, vfo, freq+ts);   /* up */
        break;
  case RIG_OP_DOWN:
        ret = gr_get_freq(rig, vfo, &freq);
        if (ret != RIG_OK) break;
        ret = gnuradio_get_ts(rig, vfo, &ts);
        if (ret != RIG_OK) break;
        ret = gr_set_freq(rig, vfo, freq-ts);   /* down */
        break;
  default:
        break;
  }

  return ret;
}

DECLARE_INITRIG_BACKEND(gnuradio)
{
      rig_debug(RIG_DEBUG_VERBOSE, "gnuradio: _init called\n");

      rig_register(&gr_caps);
      rig_register(&mc4020_caps);
      rig_register(&graudio_caps);
      rig_register(&graudioiq_caps);

      return RIG_OK;
}


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