src/hardware/hameg-hmo/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdlib.h>
  22 #include "scpi.h"
  23 #include "protocol.h"
  24
  25 static struct sr_dev_driver hameg_hmo_driver_info;
  26
  27 static const char *manufacturers[] = {
  28         "HAMEG",
  29         "Rohde&Schwarz",
  30 };
  31
  32 static const uint32_t scanopts[] = {
  33         SR_CONF_CONN,
  34         SR_CONF_SERIALCOMM,
  35 };
  36
  37 static const uint32_t drvopts[] = {
  38         SR_CONF_OSCILLOSCOPE,
  39 };
  40
  41 enum {
  42         CG_INVALID = -1,
  43         CG_NONE,
  44         CG_ANALOG,
  45         CG_DIGITAL,
  46 };
  47
  48 static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
  49 {
  50         struct sr_dev_inst *sdi;
  51         struct dev_context *devc;
  52         struct sr_scpi_hw_info *hw_info;
  53
  54         sdi = NULL;
  55         devc = NULL;
  56         hw_info = NULL;
  57
  58         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  59                 sr_info("Couldn't get IDN response.");
  60                 goto fail;
  61         }
  62
  63         if (std_str_idx_s(hw_info->manufacturer, ARRAY_AND_SIZE(manufacturers)) < 0)
  64                 goto fail;
  65
  66         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  67         sdi->vendor = g_strdup(hw_info->manufacturer);
  68         sdi->model = g_strdup(hw_info->model);
  69         sdi->version = g_strdup(hw_info->firmware_version);
  70         sdi->serial_num = g_strdup(hw_info->serial_number);
  71         sdi->driver = &hameg_hmo_driver_info;
  72         sdi->inst_type = SR_INST_SCPI;
  73         sdi->conn = scpi;
  74
  75         sr_scpi_hw_info_free(hw_info);
  76         hw_info = NULL;
  77
  78         devc = g_malloc0(sizeof(struct dev_context));
  79
  80         sdi->priv = devc;
  81
  82         if (hmo_init_device(sdi) != SR_OK)
  83                 goto fail;
  84
  85         return sdi;
  86
  87 fail:
  88         sr_scpi_hw_info_free(hw_info);
  89         sr_dev_inst_free(sdi);
  90         g_free(devc);
  91
  92         return NULL;
  93 }
  94
  95 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  96 {
  97         return sr_scpi_scan(di->context, options, probe_device);
  98 }
  99
 100 static void clear_helper(struct dev_context *devc)
 101 {
 102         hmo_scope_state_free(devc->model_state);
 103         g_free(devc->analog_groups);
 104         g_free(devc->digital_groups);
 105 }
 106
 107 static int dev_clear(const struct sr_dev_driver *di)
 108 {
 109         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 110 }
 111
 112 static int dev_open(struct sr_dev_inst *sdi)
 113 {
 114         if (sr_scpi_open(sdi->conn) != SR_OK)
 115                 return SR_ERR;
 116
 117         if (hmo_scope_state_get(sdi) != SR_OK)
 118                 return SR_ERR;
 119
 120         return SR_OK;
 121 }
 122
 123 static int dev_close(struct sr_dev_inst *sdi)
 124 {
 125         return sr_scpi_close(sdi->conn);
 126 }
 127
 128 static int check_channel_group(struct dev_context *devc,
 129                              const struct sr_channel_group *cg)
 130 {
 131         const struct scope_config *model;
 132
 133         model = devc->model_config;
 134
 135         if (!cg)
 136                 return CG_NONE;
 137
 138         if (std_cg_idx(cg, devc->analog_groups, model->analog_channels) >= 0)
 139                 return CG_ANALOG;
 140
 141         if (std_cg_idx(cg, devc->digital_groups, model->digital_pods) >= 0)
 142                 return CG_DIGITAL;
 143
 144         sr_err("Invalid channel group specified.");
 145
 146         return CG_INVALID;
 147 }
 148
 149 static int config_get(uint32_t key, GVariant **data,
 150         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 151 {
 152         int cg_type, idx;
 153         struct dev_context *devc;
 154         const struct scope_config *model;
 155         struct scope_state *state;
 156
 157         if (!sdi)
 158                 return SR_ERR_ARG;
 159
 160         devc = sdi->priv;
 161
 162         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 163                 return SR_ERR;
 164
 165         model = devc->model_config;
 166         state = devc->model_state;
 167
 168         switch (key) {
 169         case SR_CONF_NUM_HDIV:
 170                 *data = g_variant_new_int32(model->num_xdivs);
 171                 break;
 172         case SR_CONF_TIMEBASE:
 173                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 174                                       (*model->timebases)[state->timebase][1]);
 175                 break;
 176         case SR_CONF_NUM_VDIV:
 177                 if (!cg)
 178                         return SR_ERR_CHANNEL_GROUP;
 179                 if (cg_type != CG_ANALOG)
 180                         return SR_ERR_NA;
 181                 if (std_cg_idx(cg, devc->analog_groups, model->analog_channels) < 0)
 182                         return SR_ERR_ARG;
 183                 *data = g_variant_new_int32(model->num_ydivs);
 184                 break;
 185         case SR_CONF_VDIV:
 186                 if (!cg)
 187                         return SR_ERR_CHANNEL_GROUP;
 188                 if (cg_type != CG_ANALOG)
 189                         return SR_ERR_NA;
 190                 if ((idx = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 191                         return SR_ERR_ARG;
 192                 *data = g_variant_new("(tt)",
 193                                       (*model->vdivs)[state->analog_channels[idx].vdiv][0],
 194                                       (*model->vdivs)[state->analog_channels[idx].vdiv][1]);
 195                 break;
 196         case SR_CONF_TRIGGER_SOURCE:
 197                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 198                 break;
 199         case SR_CONF_TRIGGER_SLOPE:
 200                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 201                 break;
 202         case SR_CONF_HORIZ_TRIGGERPOS:
 203                 *data = g_variant_new_double(state->horiz_triggerpos);
 204                 break;
 205         case SR_CONF_COUPLING:
 206                 if (!cg)
 207                         return SR_ERR_CHANNEL_GROUP;
 208                 if (cg_type != CG_ANALOG)
 209                         return SR_ERR_NA;
 210                 if ((idx = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 211                         return SR_ERR_ARG;
 212                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[idx].coupling]);
 213                 break;
 214         case SR_CONF_SAMPLERATE:
 215                 *data = g_variant_new_uint64(state->sample_rate);
 216                 break;
 217         default:
 218                 return SR_ERR_NA;
 219         }
 220
 221         return SR_OK;
 222 }
 223
 224 static int config_set(uint32_t key, GVariant *data,
 225         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 226 {
 227         int ret, cg_type, idx, j;
 228         char command[MAX_COMMAND_SIZE], float_str[30];
 229         struct dev_context *devc;
 230         const struct scope_config *model;
 231         struct scope_state *state;
 232         double tmp_d;
 233         gboolean update_sample_rate;
 234
 235         if (!sdi)
 236                 return SR_ERR_ARG;
 237
 238         devc = sdi->priv;
 239
 240         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 241                 return SR_ERR;
 242
 243         model = devc->model_config;
 244         state = devc->model_state;
 245         update_sample_rate = FALSE;
 246
 247         switch (key) {
 248         case SR_CONF_LIMIT_SAMPLES:
 249                 devc->samples_limit = g_variant_get_uint64(data);
 250                 ret = SR_OK;
 251                 break;
 252         case SR_CONF_LIMIT_FRAMES:
 253                 devc->frame_limit = g_variant_get_uint64(data);
 254                 ret = SR_OK;
 255                 break;
 256         case SR_CONF_TRIGGER_SOURCE:
 257                 if ((idx = std_str_idx(data, *model->trigger_sources, model->num_trigger_sources)) < 0)
 258                         return SR_ERR_ARG;
 259                 state->trigger_source = idx;
 260                 g_snprintf(command, sizeof(command),
 261                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 262                            (*model->trigger_sources)[idx]);
 263                 ret = sr_scpi_send(sdi->conn, command);
 264                 break;
 265         case SR_CONF_VDIV:
 266                 if (!cg)
 267                         return SR_ERR_CHANNEL_GROUP;
 268                 if ((idx = std_u64_tuple_idx(data, *model->vdivs, model->num_vdivs)) < 0)
 269                         return SR_ERR_ARG;
 270                 if ((j = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 271                         return SR_ERR_ARG;
 272                 state->analog_channels[j].vdiv = idx;
 273                 g_ascii_formatd(float_str, sizeof(float_str), "%E",
 274                         (float) (*model->vdivs)[idx][0] / (*model->vdivs)[idx][1]);
 275                 g_snprintf(command, sizeof(command),
 276                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 277                            j + 1, float_str);
 278                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 279                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 280                         return SR_ERR;
 281                 ret = SR_OK;
 282                 break;
 283         case SR_CONF_TIMEBASE:
 284                 if ((idx = std_u64_tuple_idx(data, *model->timebases, model->num_timebases)) < 0)
 285                         return SR_ERR_ARG;
 286                 state->timebase = idx;
 287                 g_ascii_formatd(float_str, sizeof(float_str), "%E",
 288                         (float) (*model->timebases)[idx][0] / (*model->timebases)[idx][1]);
 289                 g_snprintf(command, sizeof(command),
 290                            (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 291                            float_str);
 292                 ret = sr_scpi_send(sdi->conn, command);
 293                 update_sample_rate = TRUE;
 294                 break;
 295         case SR_CONF_HORIZ_TRIGGERPOS:
 296                 tmp_d = g_variant_get_double(data);
 297                 if (tmp_d < 0.0 || tmp_d > 1.0)
 298                         return SR_ERR;
 299                 state->horiz_triggerpos = tmp_d;
 300                 tmp_d = -(tmp_d - 0.5) *
 301                         ((double) (*model->timebases)[state->timebase][0] /
 302                         (*model->timebases)[state->timebase][1])
 303                          * model->num_xdivs;
 304                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 305                 g_snprintf(command, sizeof(command),
 306                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 307                            float_str);
 308                 ret = sr_scpi_send(sdi->conn, command);
 309                 break;
 310         case SR_CONF_TRIGGER_SLOPE:
 311                 if ((idx = std_str_idx(data, *model->trigger_slopes, model->num_trigger_slopes)) < 0)
 312                         return SR_ERR_ARG;
 313                 state->trigger_slope = idx;
 314                 g_snprintf(command, sizeof(command),
 315                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 316                            (*model->trigger_slopes)[idx]);
 317                 ret = sr_scpi_send(sdi->conn, command);
 318                 break;
 319         case SR_CONF_COUPLING:
 320                 if (!cg)
 321                         return SR_ERR_CHANNEL_GROUP;
 322                 if ((idx = std_str_idx(data, *model->coupling_options, model->num_coupling_options)) < 0)
 323                         return SR_ERR_ARG;
 324                 if ((j = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 325                         return SR_ERR_ARG;
 326                 state->analog_channels[j].coupling = idx;
 327                 g_snprintf(command, sizeof(command),
 328                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 329                            j + 1, (*model->coupling_options)[idx]);
 330                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 331                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 332                         return SR_ERR;
 333                 ret = SR_OK;
 334                 break;
 335         default:
 336                 ret = SR_ERR_NA;
 337                 break;
 338         }
 339
 340         if (ret == SR_OK)
 341                 ret = sr_scpi_get_opc(sdi->conn);
 342
 343         if (ret == SR_OK && update_sample_rate)
 344                 ret = hmo_update_sample_rate(sdi);
 345
 346         return ret;
 347 }
 348
 349 static int config_list(uint32_t key, GVariant **data,
 350         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 351 {
 352         int cg_type = CG_NONE;
 353         struct dev_context *devc = NULL;
 354         const struct scope_config *model = NULL;
 355
 356         if (sdi) {
 357                 devc = sdi->priv;
 358                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 359                         return SR_ERR;
 360
 361                 model = devc->model_config;
 362         }
 363
 364         switch (key) {
 365         case SR_CONF_SCAN_OPTIONS:
 366                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(scanopts));
 367                 break;
 368         case SR_CONF_DEVICE_OPTIONS:
 369                 if (!cg) {
 370                         if (model)
 371                                 *data = std_gvar_array_u32(*model->devopts, model->num_devopts);
 372                         else
 373                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(drvopts));
 374                 } else if (cg_type == CG_ANALOG) {
 375                         *data = std_gvar_array_u32(*model->devopts_cg_analog, model->num_devopts_cg_analog);
 376                 } else {
 377                         *data = std_gvar_array_u32(NULL, 0);
 378                 }
 379                 break;
 380         case SR_CONF_COUPLING:
 381                 if (!cg)
 382                         return SR_ERR_CHANNEL_GROUP;
 383                 if (!model)
 384                         return SR_ERR_ARG;
 385                 *data = g_variant_new_strv(*model->coupling_options, model->num_coupling_options);
 386                 break;
 387         case SR_CONF_TRIGGER_SOURCE:
 388                 if (!model)
 389                         return SR_ERR_ARG;
 390                 *data = g_variant_new_strv(*model->trigger_sources, model->num_trigger_sources);
 391                 break;
 392         case SR_CONF_TRIGGER_SLOPE:
 393                 if (!model)
 394                         return SR_ERR_ARG;
 395                 *data = g_variant_new_strv(*model->trigger_slopes, model->num_trigger_slopes);
 396                 break;
 397         case SR_CONF_TIMEBASE:
 398                 if (!model)
 399                         return SR_ERR_ARG;
 400                 *data = std_gvar_tuple_array(*model->timebases, model->num_timebases);
 401                 break;
 402         case SR_CONF_VDIV:
 403                 if (!cg)
 404                         return SR_ERR_CHANNEL_GROUP;
 405                 if (!model)
 406                         return SR_ERR_ARG;
 407                 *data = std_gvar_tuple_array(*model->vdivs, model->num_vdivs);
 408                 break;
 409         default:
 410                 return SR_ERR_NA;
 411         }
 412
 413         return SR_OK;
 414 }
 415
 416 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 417 {
 418         char command[MAX_COMMAND_SIZE];
 419         struct sr_channel *ch;
 420         struct dev_context *devc;
 421         const struct scope_config *model;
 422
 423         devc = sdi->priv;
 424         model = devc->model_config;
 425
 426         ch = devc->current_channel->data;
 427
 428         switch (ch->type) {
 429         case SR_CHANNEL_ANALOG:
 430                 g_snprintf(command, sizeof(command),
 431                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 432 #ifdef WORDS_BIGENDIAN
 433                            "MSBF",
 434 #else
 435                            "LSBF",
 436 #endif
 437                            ch->index + 1);
 438                 break;
 439         case SR_CHANNEL_LOGIC:
 440                 g_snprintf(command, sizeof(command),
 441                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 442                            ch->index < 8 ? 1 : 2);
 443                 break;
 444         default:
 445                 sr_err("Invalid channel type.");
 446                 break;
 447         }
 448
 449         return sr_scpi_send(sdi->conn, command);
 450 }
 451
 452 static int hmo_check_channels(GSList *channels)
 453 {
 454         GSList *l;
 455         struct sr_channel *ch;
 456         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 457         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 458         size_t idx;
 459
 460         /* Preset "not enabled" for all channels / pods. */
 461         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 462                 enabled_chan[idx] = FALSE;
 463         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 464                 enabled_pod[idx] = FALSE;
 465
 466         /*
 467          * Determine which channels / pods are required for the caller's
 468          * specified configuration.
 469          */
 470         for (l = channels; l; l = l->next) {
 471                 ch = l->data;
 472                 switch (ch->type) {
 473                 case SR_CHANNEL_ANALOG:
 474                         idx = ch->index;
 475                         if (idx < ARRAY_SIZE(enabled_chan))
 476                                 enabled_chan[idx] = TRUE;
 477                         break;
 478                 case SR_CHANNEL_LOGIC:
 479                         idx = ch->index / 8;
 480                         if (idx < ARRAY_SIZE(enabled_pod))
 481                                 enabled_pod[idx] = TRUE;
 482                         break;
 483                 default:
 484                         return SR_ERR;
 485                 }
 486         }
 487
 488         /*
 489          * Check for resource conflicts. Some channels can be either
 490          * analog or digital, but never both at the same time.
 491          *
 492          * Note that the constraints might depend on the specific model.
 493          * These tests might need some adjustment when support for more
 494          * models gets added to the driver.
 495          */
 496         if (enabled_pod[0] && enabled_chan[2])
 497                 return SR_ERR;
 498         if (enabled_pod[1] && enabled_chan[3])
 499                 return SR_ERR;
 500         return SR_OK;
 501 }
 502
 503 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 504 {
 505         GSList *l;
 506         unsigned int i;
 507         gboolean *pod_enabled, setup_changed;
 508         char command[MAX_COMMAND_SIZE];
 509         struct scope_state *state;
 510         const struct scope_config *model;
 511         struct sr_channel *ch;
 512         struct dev_context *devc;
 513         struct sr_scpi_dev_inst *scpi;
 514         int ret;
 515
 516         devc = sdi->priv;
 517         scpi = sdi->conn;
 518         state = devc->model_state;
 519         model = devc->model_config;
 520         setup_changed = FALSE;
 521
 522         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 523
 524         for (l = sdi->channels; l; l = l->next) {
 525                 ch = l->data;
 526                 switch (ch->type) {
 527                 case SR_CHANNEL_ANALOG:
 528                         if (ch->enabled == state->analog_channels[ch->index].state)
 529                                 break;
 530                         g_snprintf(command, sizeof(command),
 531                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 532                                    ch->index + 1, ch->enabled);
 533
 534                         if (sr_scpi_send(scpi, command) != SR_OK) {
 535                                 g_free(pod_enabled);
 536                                 return SR_ERR;
 537                         }
 538                         state->analog_channels[ch->index].state = ch->enabled;
 539                         setup_changed = TRUE;
 540                         break;
 541                 case SR_CHANNEL_LOGIC:
 542                         /*
 543                          * A digital POD needs to be enabled for every group of
 544                          * 8 channels.
 545                          */
 546                         if (ch->enabled)
 547                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 548
 549                         if (ch->enabled == state->digital_channels[ch->index])
 550                                 break;
 551                         g_snprintf(command, sizeof(command),
 552                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 553                                    ch->index, ch->enabled);
 554
 555                         if (sr_scpi_send(scpi, command) != SR_OK) {
 556                                 g_free(pod_enabled);
 557                                 return SR_ERR;
 558                         }
 559
 560                         state->digital_channels[ch->index] = ch->enabled;
 561                         setup_changed = TRUE;
 562                         break;
 563                 default:
 564                         g_free(pod_enabled);
 565                         return SR_ERR;
 566                 }
 567         }
 568
 569         ret = SR_OK;
 570         for (i = 0; i < model->digital_pods; i++) {
 571                 if (state->digital_pods[i] == pod_enabled[i])
 572                         continue;
 573                 g_snprintf(command, sizeof(command),
 574                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 575                            i + 1, pod_enabled[i]);
 576                 if (sr_scpi_send(scpi, command) != SR_OK) {
 577                         ret = SR_ERR;
 578                         break;
 579                 }
 580                 state->digital_pods[i] = pod_enabled[i];
 581                 setup_changed = TRUE;
 582         }
 583         g_free(pod_enabled);
 584         if (ret != SR_OK)
 585                 return ret;
 586
 587         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 588                 return SR_ERR;
 589
 590         return SR_OK;
 591 }
 592
 593 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 594 {
 595         GSList *l;
 596         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 597         size_t group, pod_count;
 598         struct sr_channel *ch;
 599         struct dev_context *devc;
 600         struct sr_scpi_dev_inst *scpi;
 601         int ret;
 602
 603         scpi = sdi->conn;
 604         devc = sdi->priv;
 605
 606         devc->num_samples = 0;
 607         devc->num_frames = 0;
 608
 609         /* Preset empty results. */
 610         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 611                 digital_added[group] = FALSE;
 612         g_slist_free(devc->enabled_channels);
 613         devc->enabled_channels = NULL;
 614
 615         /*
 616          * Contruct the list of enabled channels. Determine the highest
 617          * number of digital pods involved in the acquisition.
 618          */
 619         pod_count = 0;
 620         for (l = sdi->channels; l; l = l->next) {
 621                 ch = l->data;
 622                 if (!ch->enabled)
 623                         continue;
 624                 /* Only add a single digital channel per group (pod). */
 625                 group = ch->index / 8;
 626                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 627                         devc->enabled_channels = g_slist_append(
 628                                         devc->enabled_channels, ch);
 629                         if (ch->type == SR_CHANNEL_LOGIC) {
 630                                 digital_added[group] = TRUE;
 631                                 if (pod_count < group + 1)
 632                                         pod_count = group + 1;
 633                         }
 634                 }
 635         }
 636         if (!devc->enabled_channels)
 637                 return SR_ERR;
 638         devc->pod_count = pod_count;
 639         devc->logic_data = NULL;
 640
 641         /*
 642          * Check constraints. Some channels can be either analog or
 643          * digital, but not both at the same time.
 644          */
 645         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 646                 sr_err("Invalid channel configuration specified!");
 647                 ret = SR_ERR_NA;
 648                 goto free_enabled;
 649         }
 650
 651         /*
 652          * Configure the analog and digital channels and the
 653          * corresponding digital pods.
 654          */
 655         if (hmo_setup_channels(sdi) != SR_OK) {
 656                 sr_err("Failed to setup channel configuration!");
 657                 ret = SR_ERR;
 658                 goto free_enabled;
 659         }
 660
 661         /*
 662          * Start acquisition on the first enabled channel. The
 663          * receive routine will continue driving the acquisition.
 664          */
 665         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 666                         hmo_receive_data, (void *)sdi);
 667
 668         std_session_send_df_header(sdi);
 669
 670         devc->current_channel = devc->enabled_channels;
 671
 672         return hmo_request_data(sdi);
 673
 674 free_enabled:
 675         g_slist_free(devc->enabled_channels);
 676         devc->enabled_channels = NULL;
 677         return ret;
 678 }
 679
 680 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 681 {
 682         struct dev_context *devc;
 683         struct sr_scpi_dev_inst *scpi;
 684
 685         std_session_send_df_end(sdi);
 686
 687         devc = sdi->priv;
 688
 689         devc->num_samples = 0;
 690         devc->num_frames = 0;
 691         g_slist_free(devc->enabled_channels);
 692         devc->enabled_channels = NULL;
 693         scpi = sdi->conn;
 694         sr_scpi_source_remove(sdi->session, scpi);
 695
 696         return SR_OK;
 697 }
 698
 699 static struct sr_dev_driver hameg_hmo_driver_info = {
 700         .name = "hameg-hmo",
 701         .longname = "Hameg HMO",
 702         .api_version = 1,
 703         .init = std_init,
 704         .cleanup = std_cleanup,
 705         .scan = scan,
 706         .dev_list = std_dev_list,
 707         .dev_clear = dev_clear,
 708         .config_get = config_get,
 709         .config_set = config_set,
 710         .config_list = config_list,
 711         .dev_open = dev_open,
 712         .dev_close = dev_close,
 713         .dev_acquisition_start = dev_acquisition_start,
 714         .dev_acquisition_stop = dev_acquisition_stop,
 715         .context = NULL,
 716 };
 717 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);