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 #define SERIALCOMM "115200/8n1/flow=1"
  26
  27 static struct sr_dev_driver hameg_hmo_driver_info;
  28
  29 static const char *manufacturers[] = {
  30         "HAMEG",
  31         "Rohde&Schwarz",
  32 };
  33
  34 static const uint32_t scanopts[] = {
  35         SR_CONF_CONN,
  36         SR_CONF_SERIALCOMM,
  37 };
  38
  39 static const uint32_t drvopts[] = {
  40         SR_CONF_OSCILLOSCOPE,
  41 };
  42
  43 enum {
  44         CG_INVALID = -1,
  45         CG_NONE,
  46         CG_ANALOG,
  47         CG_DIGITAL,
  48 };
  49
  50 static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
  51 {
  52         struct sr_dev_inst *sdi;
  53         struct dev_context *devc;
  54         struct sr_scpi_hw_info *hw_info;
  55
  56         sdi = NULL;
  57         devc = NULL;
  58         hw_info = NULL;
  59
  60         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  61                 sr_info("Couldn't get IDN response.");
  62                 goto fail;
  63         }
  64
  65         if (std_str_idx_s(hw_info->manufacturer, ARRAY_AND_SIZE(manufacturers)) < 0)
  66                 goto fail;
  67
  68         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  69         sdi->vendor = g_strdup(hw_info->manufacturer);
  70         sdi->model = g_strdup(hw_info->model);
  71         sdi->version = g_strdup(hw_info->firmware_version);
  72         sdi->serial_num = g_strdup(hw_info->serial_number);
  73         sdi->driver = &hameg_hmo_driver_info;
  74         sdi->inst_type = SR_INST_SCPI;
  75         sdi->conn = scpi;
  76
  77         sr_scpi_hw_info_free(hw_info);
  78         hw_info = NULL;
  79
  80         devc = g_malloc0(sizeof(struct dev_context));
  81
  82         sdi->priv = devc;
  83
  84         if (hmo_init_device(sdi) != SR_OK)
  85                 goto fail;
  86
  87         return sdi;
  88
  89 fail:
  90         sr_scpi_hw_info_free(hw_info);
  91         sr_dev_inst_free(sdi);
  92         g_free(devc);
  93
  94         return NULL;
  95 }
  96
  97 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  98 {
  99         return sr_scpi_scan(di->context, options, probe_device);
 100 }
 101
 102 static void clear_helper(struct dev_context *devc)
 103 {
 104         hmo_scope_state_free(devc->model_state);
 105         g_free(devc->analog_groups);
 106         g_free(devc->digital_groups);
 107 }
 108
 109 static int dev_clear(const struct sr_dev_driver *di)
 110 {
 111         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 112 }
 113
 114 static int dev_open(struct sr_dev_inst *sdi)
 115 {
 116         if (sr_scpi_open(sdi->conn) != SR_OK)
 117                 return SR_ERR;
 118
 119         if (hmo_scope_state_get(sdi) != SR_OK)
 120                 return SR_ERR;
 121
 122         return SR_OK;
 123 }
 124
 125 static int dev_close(struct sr_dev_inst *sdi)
 126 {
 127         return sr_scpi_close(sdi->conn);
 128 }
 129
 130 static int check_channel_group(struct dev_context *devc,
 131                              const struct sr_channel_group *cg)
 132 {
 133         const struct scope_config *model;
 134
 135         model = devc->model_config;
 136
 137         if (!cg)
 138                 return CG_NONE;
 139
 140         if (std_cg_idx(cg, devc->analog_groups, model->analog_channels) >= 0)
 141                 return CG_ANALOG;
 142
 143         if (std_cg_idx(cg, devc->digital_groups, model->digital_pods) >= 0)
 144                 return CG_DIGITAL;
 145
 146         sr_err("Invalid channel group specified.");
 147
 148         return CG_INVALID;
 149 }
 150
 151 static int config_get(uint32_t key, GVariant **data,
 152         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 153 {
 154         int cg_type, idx;
 155         struct dev_context *devc;
 156         const struct scope_config *model;
 157         struct scope_state *state;
 158
 159         if (!sdi)
 160                 return SR_ERR_ARG;
 161
 162         devc = sdi->priv;
 163
 164         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 165                 return SR_ERR;
 166
 167         model = devc->model_config;
 168         state = devc->model_state;
 169
 170         switch (key) {
 171         case SR_CONF_NUM_HDIV:
 172                 *data = g_variant_new_int32(model->num_xdivs);
 173                 break;
 174         case SR_CONF_TIMEBASE:
 175                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 176                                       (*model->timebases)[state->timebase][1]);
 177                 break;
 178         case SR_CONF_NUM_VDIV:
 179                 if (!cg) {
 180                         return SR_ERR_CHANNEL_GROUP;
 181                 } else if (cg_type == CG_ANALOG) {
 182                         if (std_cg_idx(cg, devc->analog_groups, model->analog_channels) < 0)
 183                                 return SR_ERR_ARG;
 184                         *data = g_variant_new_int32(model->num_ydivs);
 185                 } else {
 186                         return SR_ERR_NA;
 187                 }
 188                 break;
 189         case SR_CONF_VDIV:
 190                 if (!cg) {
 191                         return SR_ERR_CHANNEL_GROUP;
 192                 } else if (cg_type == CG_ANALOG) {
 193                         if ((idx = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 194                                 return SR_ERR_ARG;
 195                         *data = g_variant_new("(tt)",
 196                                               (*model->vdivs)[state->analog_channels[idx].vdiv][0],
 197                                               (*model->vdivs)[state->analog_channels[idx].vdiv][1]);
 198                 } else {
 199                         return SR_ERR_NA;
 200                 }
 201                 break;
 202         case SR_CONF_TRIGGER_SOURCE:
 203                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 204                 break;
 205         case SR_CONF_TRIGGER_SLOPE:
 206                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 207                 break;
 208         case SR_CONF_HORIZ_TRIGGERPOS:
 209                 *data = g_variant_new_double(state->horiz_triggerpos);
 210                 break;
 211         case SR_CONF_COUPLING:
 212                 if (!cg) {
 213                         return SR_ERR_CHANNEL_GROUP;
 214                 } else if (cg_type == CG_ANALOG) {
 215                         if ((idx = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 216                                 return SR_ERR_ARG;
 217                         *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[idx].coupling]);
 218                 } else {
 219                         return SR_ERR_NA;
 220                 }
 221                 break;
 222         case SR_CONF_SAMPLERATE:
 223                 *data = g_variant_new_uint64(state->sample_rate);
 224                 break;
 225         default:
 226                 return SR_ERR_NA;
 227         }
 228
 229         return SR_OK;
 230 }
 231
 232 static int config_set(uint32_t key, GVariant *data,
 233         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 234 {
 235         int ret, cg_type, idx, j;
 236         char command[MAX_COMMAND_SIZE], float_str[30];
 237         struct dev_context *devc;
 238         const struct scope_config *model;
 239         struct scope_state *state;
 240         double tmp_d;
 241         gboolean update_sample_rate;
 242
 243         if (!sdi)
 244                 return SR_ERR_ARG;
 245
 246         devc = sdi->priv;
 247
 248         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 249                 return SR_ERR;
 250
 251         model = devc->model_config;
 252         state = devc->model_state;
 253         update_sample_rate = FALSE;
 254
 255         ret = SR_ERR_NA;
 256
 257         switch (key) {
 258         case SR_CONF_LIMIT_FRAMES:
 259                 devc->frame_limit = g_variant_get_uint64(data);
 260                 ret = SR_OK;
 261                 break;
 262         case SR_CONF_TRIGGER_SOURCE:
 263                 if ((idx = std_str_idx(data, *model->trigger_sources, model->num_trigger_sources)) < 0)
 264                         return SR_ERR_ARG;
 265                 state->trigger_source = idx;
 266                 g_snprintf(command, sizeof(command),
 267                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 268                            (*model->trigger_sources)[idx]);
 269                 ret = sr_scpi_send(sdi->conn, command);
 270                 break;
 271         case SR_CONF_VDIV:
 272                 if (!cg)
 273                         return SR_ERR_CHANNEL_GROUP;
 274                 if ((idx = std_u64_tuple_idx(data, *model->vdivs, model->num_vdivs)) < 0)
 275                         return SR_ERR_ARG;
 276                 if ((j = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 277                         return SR_ERR_ARG;
 278                 state->analog_channels[j].vdiv = idx;
 279                 g_ascii_formatd(float_str, sizeof(float_str), "%E",
 280                         (float) (*model->vdivs)[idx][0] / (*model->vdivs)[idx][1]);
 281                 g_snprintf(command, sizeof(command),
 282                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 283                            j + 1, float_str);
 284                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 285                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 286                         return SR_ERR;
 287                 ret = SR_OK;
 288                 break;
 289         case SR_CONF_TIMEBASE:
 290                 if ((idx = std_u64_tuple_idx(data, *model->timebases, model->num_timebases)) < 0)
 291                         return SR_ERR_ARG;
 292                 state->timebase = idx;
 293                 g_ascii_formatd(float_str, sizeof(float_str), "%E",
 294                         (float) (*model->timebases)[idx][0] / (*model->timebases)[idx][1]);
 295                 g_snprintf(command, sizeof(command),
 296                            (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 297                            float_str);
 298                 ret = sr_scpi_send(sdi->conn, command);
 299                 update_sample_rate = TRUE;
 300                 break;
 301         case SR_CONF_HORIZ_TRIGGERPOS:
 302                 tmp_d = g_variant_get_double(data);
 303                 if (tmp_d < 0.0 || tmp_d > 1.0)
 304                         return SR_ERR;
 305                 state->horiz_triggerpos = tmp_d;
 306                 tmp_d = -(tmp_d - 0.5) *
 307                         ((double) (*model->timebases)[state->timebase][0] /
 308                         (*model->timebases)[state->timebase][1])
 309                          * model->num_xdivs;
 310                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 311                 g_snprintf(command, sizeof(command),
 312                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 313                            float_str);
 314                 ret = sr_scpi_send(sdi->conn, command);
 315                 break;
 316         case SR_CONF_TRIGGER_SLOPE:
 317                 if ((idx = std_str_idx(data, *model->trigger_slopes, model->num_trigger_slopes)) < 0)
 318                         return SR_ERR_ARG;
 319                 state->trigger_slope = idx;
 320                 g_snprintf(command, sizeof(command),
 321                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 322                            (*model->trigger_slopes)[idx]);
 323                 ret = sr_scpi_send(sdi->conn, command);
 324                 break;
 325         case SR_CONF_COUPLING:
 326                 if (!cg)
 327                         return SR_ERR_CHANNEL_GROUP;
 328                 if ((idx = std_str_idx(data, *model->coupling_options, model->num_coupling_options)) < 0)
 329                         return SR_ERR_ARG;
 330                 if ((j = std_cg_idx(cg, devc->analog_groups, model->analog_channels)) < 0)
 331                         return SR_ERR_ARG;
 332                 state->analog_channels[j].coupling = idx;
 333                 g_snprintf(command, sizeof(command),
 334                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 335                            j + 1, (*model->coupling_options)[idx]);
 336                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 337                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 338                         return SR_ERR;
 339                 ret = SR_OK;
 340                 break;
 341         default:
 342                 ret = SR_ERR_NA;
 343                 break;
 344         }
 345
 346         if (ret == SR_OK)
 347                 ret = sr_scpi_get_opc(sdi->conn);
 348
 349         if (ret == SR_OK && update_sample_rate)
 350                 ret = hmo_update_sample_rate(sdi);
 351
 352         return ret;
 353 }
 354
 355 static int config_list(uint32_t key, GVariant **data,
 356         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 357 {
 358         int cg_type = CG_NONE;
 359         struct dev_context *devc = NULL;
 360         const struct scope_config *model = NULL;
 361
 362         if (sdi) {
 363                 devc = sdi->priv;
 364                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 365                         return SR_ERR;
 366
 367                 model = devc->model_config;
 368         }
 369
 370         switch (key) {
 371         case SR_CONF_SCAN_OPTIONS:
 372                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(scanopts));
 373                 break;
 374         case SR_CONF_DEVICE_OPTIONS:
 375                 if (!cg) {
 376                         if (model)
 377                                 *data = std_gvar_array_u32((const uint32_t *)model->devopts, model->num_devopts);
 378                         else
 379                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(drvopts));
 380                 } else if (cg_type == CG_ANALOG) {
 381                         *data = std_gvar_array_u32((const uint32_t *)model->devopts_cg_analog, model->num_devopts_cg_analog);
 382                 } else {
 383                         *data = std_gvar_array_u32(NULL, 0);
 384                 }
 385                 break;
 386         case SR_CONF_COUPLING:
 387                 if (!cg)
 388                         return SR_ERR_CHANNEL_GROUP;
 389                 *data = g_variant_new_strv(*model->coupling_options, model->num_coupling_options);
 390                 break;
 391         case SR_CONF_TRIGGER_SOURCE:
 392                 if (!model)
 393                         return SR_ERR_ARG;
 394                 *data = g_variant_new_strv(*model->trigger_sources, model->num_trigger_sources);
 395                 break;
 396         case SR_CONF_TRIGGER_SLOPE:
 397                 if (!model)
 398                         return SR_ERR_ARG;
 399                 *data = g_variant_new_strv(*model->trigger_slopes, model->num_trigger_slopes);
 400                 break;
 401         case SR_CONF_TIMEBASE:
 402                 if (!model)
 403                         return SR_ERR_ARG;
 404                 *data = std_gvar_tuple_array(*model->timebases, model->num_timebases);
 405                 break;
 406         case SR_CONF_VDIV:
 407                 if (!cg)
 408                         return SR_ERR_CHANNEL_GROUP;
 409                 *data = std_gvar_tuple_array(*model->vdivs, model->num_vdivs);
 410                 break;
 411         default:
 412                 return SR_ERR_NA;
 413         }
 414
 415         return SR_OK;
 416 }
 417
 418 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 419 {
 420         char command[MAX_COMMAND_SIZE];
 421         struct sr_channel *ch;
 422         struct dev_context *devc;
 423         const struct scope_config *model;
 424
 425         devc = sdi->priv;
 426         model = devc->model_config;
 427
 428         ch = devc->current_channel->data;
 429
 430         switch (ch->type) {
 431         case SR_CHANNEL_ANALOG:
 432                 g_snprintf(command, sizeof(command),
 433                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 434 #ifdef WORDS_BIGENDIAN
 435                            "MSBF",
 436 #else
 437                            "LSBF",
 438 #endif
 439                            ch->index + 1);
 440                 break;
 441         case SR_CHANNEL_LOGIC:
 442                 g_snprintf(command, sizeof(command),
 443                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 444                            ch->index < 8 ? 1 : 2);
 445                 break;
 446         default:
 447                 sr_err("Invalid channel type.");
 448                 break;
 449         }
 450
 451         return sr_scpi_send(sdi->conn, command);
 452 }
 453
 454 static int hmo_check_channels(GSList *channels)
 455 {
 456         GSList *l;
 457         struct sr_channel *ch;
 458         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 459         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 460         size_t idx;
 461
 462         /* Preset "not enabled" for all channels / pods. */
 463         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 464                 enabled_chan[idx] = FALSE;
 465         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 466                 enabled_pod[idx] = FALSE;
 467
 468         /*
 469          * Determine which channels / pods are required for the caller's
 470          * specified configuration.
 471          */
 472         for (l = channels; l; l = l->next) {
 473                 ch = l->data;
 474                 switch (ch->type) {
 475                 case SR_CHANNEL_ANALOG:
 476                         idx = ch->index;
 477                         if (idx < ARRAY_SIZE(enabled_chan))
 478                                 enabled_chan[idx] = TRUE;
 479                         break;
 480                 case SR_CHANNEL_LOGIC:
 481                         idx = ch->index / 8;
 482                         if (idx < ARRAY_SIZE(enabled_pod))
 483                                 enabled_pod[idx] = TRUE;
 484                         break;
 485                 default:
 486                         return SR_ERR;
 487                 }
 488         }
 489
 490         /*
 491          * Check for resource conflicts. Some channels can be either
 492          * analog or digital, but never both at the same time.
 493          *
 494          * Note that the constraints might depend on the specific model.
 495          * These tests might need some adjustment when support for more
 496          * models gets added to the driver.
 497          */
 498         if (enabled_pod[0] && enabled_chan[2])
 499                 return SR_ERR;
 500         if (enabled_pod[1] && enabled_chan[3])
 501                 return SR_ERR;
 502         return SR_OK;
 503 }
 504
 505 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 506 {
 507         GSList *l;
 508         unsigned int i;
 509         gboolean *pod_enabled, setup_changed;
 510         char command[MAX_COMMAND_SIZE];
 511         struct scope_state *state;
 512         const struct scope_config *model;
 513         struct sr_channel *ch;
 514         struct dev_context *devc;
 515         struct sr_scpi_dev_inst *scpi;
 516
 517         devc = sdi->priv;
 518         scpi = sdi->conn;
 519         state = devc->model_state;
 520         model = devc->model_config;
 521         setup_changed = FALSE;
 522
 523         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 524
 525         for (l = sdi->channels; l; l = l->next) {
 526                 ch = l->data;
 527                 switch (ch->type) {
 528                 case SR_CHANNEL_ANALOG:
 529                         if (ch->enabled == state->analog_channels[ch->index].state)
 530                                 break;
 531                         g_snprintf(command, sizeof(command),
 532                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 533                                    ch->index + 1, ch->enabled);
 534
 535                         if (sr_scpi_send(scpi, command) != SR_OK)
 536                                 return SR_ERR;
 537                         state->analog_channels[ch->index].state = ch->enabled;
 538                         setup_changed = TRUE;
 539                         break;
 540                 case SR_CHANNEL_LOGIC:
 541                         /*
 542                          * A digital POD needs to be enabled for every group of
 543                          * 8 channels.
 544                          */
 545                         if (ch->enabled)
 546                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 547
 548                         if (ch->enabled == state->digital_channels[ch->index])
 549                                 break;
 550                         g_snprintf(command, sizeof(command),
 551                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 552                                    ch->index, ch->enabled);
 553
 554                         if (sr_scpi_send(scpi, command) != SR_OK)
 555                                 return SR_ERR;
 556
 557                         state->digital_channels[ch->index] = ch->enabled;
 558                         setup_changed = TRUE;
 559                         break;
 560                 default:
 561                         return SR_ERR;
 562                 }
 563         }
 564
 565         for (i = 0; i < model->digital_pods; i++) {
 566                 if (state->digital_pods[i] == pod_enabled[i])
 567                         continue;
 568                 g_snprintf(command, sizeof(command),
 569                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 570                            i + 1, pod_enabled[i]);
 571                 if (sr_scpi_send(scpi, command) != SR_OK)
 572                         return SR_ERR;
 573                 state->digital_pods[i] = pod_enabled[i];
 574                 setup_changed = TRUE;
 575         }
 576
 577         g_free(pod_enabled);
 578
 579         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 580                 return SR_ERR;
 581
 582         return SR_OK;
 583 }
 584
 585 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 586 {
 587         GSList *l;
 588         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 589         size_t group, pod_count;
 590         struct sr_channel *ch;
 591         struct dev_context *devc;
 592         struct sr_scpi_dev_inst *scpi;
 593         int ret;
 594
 595         scpi = sdi->conn;
 596         devc = sdi->priv;
 597
 598         /* Preset empty results. */
 599         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 600                 digital_added[group] = FALSE;
 601         g_slist_free(devc->enabled_channels);
 602         devc->enabled_channels = NULL;
 603
 604         /*
 605          * Contruct the list of enabled channels. Determine the highest
 606          * number of digital pods involved in the acquisition.
 607          */
 608         pod_count = 0;
 609         for (l = sdi->channels; l; l = l->next) {
 610                 ch = l->data;
 611                 if (!ch->enabled)
 612                         continue;
 613                 /* Only add a single digital channel per group (pod). */
 614                 group = ch->index / 8;
 615                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 616                         devc->enabled_channels = g_slist_append(
 617                                         devc->enabled_channels, ch);
 618                         if (ch->type == SR_CHANNEL_LOGIC) {
 619                                 digital_added[group] = TRUE;
 620                                 if (pod_count < group + 1)
 621                                         pod_count = group + 1;
 622                         }
 623                 }
 624         }
 625         if (!devc->enabled_channels)
 626                 return SR_ERR;
 627         devc->pod_count = pod_count;
 628         devc->logic_data = NULL;
 629
 630         /*
 631          * Check constraints. Some channels can be either analog or
 632          * digital, but not both at the same time.
 633          */
 634         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 635                 sr_err("Invalid channel configuration specified!");
 636                 ret = SR_ERR_NA;
 637                 goto free_enabled;
 638         }
 639
 640         /*
 641          * Configure the analog and digital channels and the
 642          * corresponding digital pods.
 643          */
 644         if (hmo_setup_channels(sdi) != SR_OK) {
 645                 sr_err("Failed to setup channel configuration!");
 646                 ret = SR_ERR;
 647                 goto free_enabled;
 648         }
 649
 650         /*
 651          * Start acquisition on the first enabled channel. The
 652          * receive routine will continue driving the acquisition.
 653          */
 654         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 655                         hmo_receive_data, (void *)sdi);
 656
 657         std_session_send_df_header(sdi);
 658
 659         devc->current_channel = devc->enabled_channels;
 660
 661         return hmo_request_data(sdi);
 662
 663 free_enabled:
 664         g_slist_free(devc->enabled_channels);
 665         devc->enabled_channels = NULL;
 666         return ret;
 667 }
 668
 669 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 670 {
 671         struct dev_context *devc;
 672         struct sr_scpi_dev_inst *scpi;
 673
 674         std_session_send_df_end(sdi);
 675
 676         devc = sdi->priv;
 677
 678         devc->num_frames = 0;
 679         g_slist_free(devc->enabled_channels);
 680         devc->enabled_channels = NULL;
 681         scpi = sdi->conn;
 682         sr_scpi_source_remove(sdi->session, scpi);
 683
 684         return SR_OK;
 685 }
 686
 687 static struct sr_dev_driver hameg_hmo_driver_info = {
 688         .name = "hameg-hmo",
 689         .longname = "Hameg HMO",
 690         .api_version = 1,
 691         .init = std_init,
 692         .cleanup = std_cleanup,
 693         .scan = scan,
 694         .dev_list = std_dev_list,
 695         .dev_clear = dev_clear,
 696         .config_get = config_get,
 697         .config_set = config_set,
 698         .config_list = config_list,
 699         .dev_open = dev_open,
 700         .dev_close = dev_close,
 701         .dev_acquisition_start = dev_acquisition_start,
 702         .dev_acquisition_stop = dev_acquisition_stop,
 703         .context = NULL,
 704 };
 705 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);