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 int check_manufacturer(const char *manufacturer)
  51 {
  52         unsigned int i;
  53
  54         for (i = 0; i < ARRAY_SIZE(manufacturers); i++)
  55                 if (!strcmp(manufacturer, manufacturers[i]))
  56                         return SR_OK;
  57
  58         return SR_ERR;
  59 }
  60
  61 static struct sr_dev_inst *hmo_probe_serial_device(struct sr_scpi_dev_inst *scpi)
  62 {
  63         struct sr_dev_inst *sdi;
  64         struct dev_context *devc;
  65         struct sr_scpi_hw_info *hw_info;
  66
  67         sdi = NULL;
  68         devc = NULL;
  69         hw_info = NULL;
  70
  71         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  72                 sr_info("Couldn't get IDN response.");
  73                 goto fail;
  74         }
  75
  76         if (check_manufacturer(hw_info->manufacturer) != SR_OK)
  77                 goto fail;
  78
  79         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  80         sdi->vendor = g_strdup(hw_info->manufacturer);
  81         sdi->model = g_strdup(hw_info->model);
  82         sdi->version = g_strdup(hw_info->firmware_version);
  83         sdi->serial_num = g_strdup(hw_info->serial_number);
  84         sdi->driver = &hameg_hmo_driver_info;
  85         sdi->inst_type = SR_INST_SCPI;
  86         sdi->conn = scpi;
  87
  88         sr_scpi_hw_info_free(hw_info);
  89         hw_info = NULL;
  90
  91         devc = g_malloc0(sizeof(struct dev_context));
  92
  93         sdi->priv = devc;
  94
  95         if (hmo_init_device(sdi) != SR_OK)
  96                 goto fail;
  97
  98         return sdi;
  99
 100 fail:
 101         sr_scpi_hw_info_free(hw_info);
 102         sr_dev_inst_free(sdi);
 103         g_free(devc);
 104
 105         return NULL;
 106 }
 107
 108 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 109 {
 110         return sr_scpi_scan(di->context, options, hmo_probe_serial_device);
 111 }
 112
 113 static void clear_helper(struct dev_context *devc)
 114 {
 115         hmo_scope_state_free(devc->model_state);
 116         g_free(devc->analog_groups);
 117         g_free(devc->digital_groups);
 118 }
 119
 120 static int dev_clear(const struct sr_dev_driver *di)
 121 {
 122         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 123 }
 124
 125 static int dev_open(struct sr_dev_inst *sdi)
 126 {
 127         if (sr_scpi_open(sdi->conn) != SR_OK)
 128                 return SR_ERR;
 129
 130         if (hmo_scope_state_get(sdi) != SR_OK)
 131                 return SR_ERR;
 132
 133         return SR_OK;
 134 }
 135
 136 static int dev_close(struct sr_dev_inst *sdi)
 137 {
 138         return sr_scpi_close(sdi->conn);
 139 }
 140
 141 static int check_channel_group(struct dev_context *devc,
 142                              const struct sr_channel_group *cg)
 143 {
 144         unsigned int i;
 145         const struct scope_config *model;
 146
 147         model = devc->model_config;
 148
 149         if (!cg)
 150                 return CG_NONE;
 151
 152         for (i = 0; i < model->analog_channels; i++)
 153                 if (cg == devc->analog_groups[i])
 154                         return CG_ANALOG;
 155
 156         for (i = 0; i < model->digital_pods; i++)
 157                 if (cg == devc->digital_groups[i])
 158                         return CG_DIGITAL;
 159
 160         sr_err("Invalid channel group specified.");
 161
 162         return CG_INVALID;
 163 }
 164
 165 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 166                       const struct sr_channel_group *cg)
 167 {
 168         int ret, cg_type;
 169         unsigned int i;
 170         struct dev_context *devc;
 171         const struct scope_config *model;
 172         struct scope_state *state;
 173
 174         if (!sdi)
 175                 return SR_ERR_ARG;
 176
 177         devc = sdi->priv;
 178
 179         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 180                 return SR_ERR;
 181
 182         ret = SR_ERR_NA;
 183         model = devc->model_config;
 184         state = devc->model_state;
 185
 186         switch (key) {
 187         case SR_CONF_NUM_HDIV:
 188                 *data = g_variant_new_int32(model->num_xdivs);
 189                 ret = SR_OK;
 190                 break;
 191         case SR_CONF_TIMEBASE:
 192                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 193                                       (*model->timebases)[state->timebase][1]);
 194                 ret = SR_OK;
 195                 break;
 196         case SR_CONF_NUM_VDIV:
 197                 if (cg_type == CG_NONE) {
 198                         sr_err("No channel group specified.");
 199                         return SR_ERR_CHANNEL_GROUP;
 200                 } else if (cg_type == CG_ANALOG) {
 201                         for (i = 0; i < model->analog_channels; i++) {
 202                                 if (cg != devc->analog_groups[i])
 203                                         continue;
 204                                 *data = g_variant_new_int32(model->num_ydivs);
 205                                 ret = SR_OK;
 206                                 break;
 207                         }
 208
 209                 } else {
 210                         ret = SR_ERR_NA;
 211                 }
 212                 break;
 213         case SR_CONF_VDIV:
 214                 if (cg_type == CG_NONE) {
 215                         sr_err("No channel group specified.");
 216                         return SR_ERR_CHANNEL_GROUP;
 217                 } else if (cg_type == CG_ANALOG) {
 218                         for (i = 0; i < model->analog_channels; i++) {
 219                                 if (cg != devc->analog_groups[i])
 220                                         continue;
 221                                 *data = g_variant_new("(tt)",
 222                                                       (*model->vdivs)[state->analog_channels[i].vdiv][0],
 223                                                       (*model->vdivs)[state->analog_channels[i].vdiv][1]);
 224                                 ret = SR_OK;
 225                                 break;
 226                         }
 227
 228                 } else {
 229                         ret = SR_ERR_NA;
 230                 }
 231                 break;
 232         case SR_CONF_TRIGGER_SOURCE:
 233                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 234                 ret = SR_OK;
 235                 break;
 236         case SR_CONF_TRIGGER_SLOPE:
 237                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 238                 ret = SR_OK;
 239                 break;
 240         case SR_CONF_HORIZ_TRIGGERPOS:
 241                 *data = g_variant_new_double(state->horiz_triggerpos);
 242                 ret = SR_OK;
 243                 break;
 244         case SR_CONF_COUPLING:
 245                 if (cg_type == CG_NONE) {
 246                         sr_err("No channel group specified.");
 247                         return SR_ERR_CHANNEL_GROUP;
 248                 } else if (cg_type == CG_ANALOG) {
 249                         for (i = 0; i < model->analog_channels; i++) {
 250                                 if (cg != devc->analog_groups[i])
 251                                         continue;
 252                                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[i].coupling]);
 253                                 ret = SR_OK;
 254                                 break;
 255                         }
 256
 257                 } else {
 258                         ret = SR_ERR_NA;
 259                 }
 260                 break;
 261         case SR_CONF_SAMPLERATE:
 262                 *data = g_variant_new_uint64(state->sample_rate);
 263                 ret = SR_OK;
 264                 break;
 265         default:
 266                 ret = SR_ERR_NA;
 267         }
 268
 269         return ret;
 270 }
 271
 272 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 273                       const struct sr_channel_group *cg)
 274 {
 275         int ret, cg_type;
 276         unsigned int i, j;
 277         char command[MAX_COMMAND_SIZE], float_str[30];
 278         struct dev_context *devc;
 279         const struct scope_config *model;
 280         struct scope_state *state;
 281         const char *tmp;
 282         uint64_t p, q;
 283         double tmp_d;
 284         gboolean update_sample_rate;
 285
 286         if (!sdi)
 287                 return SR_ERR_ARG;
 288
 289         devc = sdi->priv;
 290
 291         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 292                 return SR_ERR;
 293
 294         model = devc->model_config;
 295         state = devc->model_state;
 296         update_sample_rate = FALSE;
 297
 298         ret = SR_ERR_NA;
 299
 300         switch (key) {
 301         case SR_CONF_LIMIT_FRAMES:
 302                 devc->frame_limit = g_variant_get_uint64(data);
 303                 ret = SR_OK;
 304                 break;
 305         case SR_CONF_TRIGGER_SOURCE:
 306                 tmp = g_variant_get_string(data, NULL);
 307                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 308                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 309                                 continue;
 310                         state->trigger_source = i;
 311                         g_snprintf(command, sizeof(command),
 312                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 313                                    (*model->trigger_sources)[i]);
 314
 315                         ret = sr_scpi_send(sdi->conn, command);
 316                         break;
 317                 }
 318                 break;
 319         case SR_CONF_VDIV:
 320                 if (cg_type == CG_NONE) {
 321                         sr_err("No channel group specified.");
 322                         return SR_ERR_CHANNEL_GROUP;
 323                 }
 324
 325                 g_variant_get(data, "(tt)", &p, &q);
 326
 327                 for (i = 0; i < model->num_vdivs; i++) {
 328                         if (p != (*model->vdivs)[i][0] ||
 329                             q != (*model->vdivs)[i][1])
 330                                 continue;
 331                         for (j = 1; j <= model->analog_channels; j++) {
 332                                 if (cg != devc->analog_groups[j - 1])
 333                                         continue;
 334                                 state->analog_channels[j - 1].vdiv = i;
 335                                 g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 336                                 g_snprintf(command, sizeof(command),
 337                                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 338                                            j, float_str);
 339
 340                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 341                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 342                                         return SR_ERR;
 343
 344                                 break;
 345                         }
 346
 347                         ret = SR_OK;
 348                         break;
 349                 }
 350                 break;
 351         case SR_CONF_TIMEBASE:
 352                 g_variant_get(data, "(tt)", &p, &q);
 353
 354                 for (i = 0; i < model->num_timebases; i++) {
 355                         if (p != (*model->timebases)[i][0] ||
 356                             q != (*model->timebases)[i][1])
 357                                 continue;
 358                         state->timebase = i;
 359                         g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 360                         g_snprintf(command, sizeof(command),
 361                                    (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 362                                    float_str);
 363
 364                         ret = sr_scpi_send(sdi->conn, command);
 365                         update_sample_rate = TRUE;
 366                         break;
 367                 }
 368                 break;
 369         case SR_CONF_HORIZ_TRIGGERPOS:
 370                 tmp_d = g_variant_get_double(data);
 371
 372                 if (tmp_d < 0.0 || tmp_d > 1.0)
 373                         return SR_ERR;
 374
 375                 state->horiz_triggerpos = tmp_d;
 376                 tmp_d = -(tmp_d - 0.5) *
 377                         ((double) (*model->timebases)[state->timebase][0] /
 378                         (*model->timebases)[state->timebase][1])
 379                          * model->num_xdivs;
 380
 381                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 382                 g_snprintf(command, sizeof(command),
 383                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 384                            float_str);
 385
 386                 ret = sr_scpi_send(sdi->conn, command);
 387                 break;
 388         case SR_CONF_TRIGGER_SLOPE:
 389                 tmp = g_variant_get_string(data, NULL);
 390                 for (i = 0; (*model->trigger_slopes)[i]; i++) {
 391                         if (g_strcmp0(tmp, (*model->trigger_slopes)[i]) != 0)
 392                                 continue;
 393                         state->trigger_slope = i;
 394                         g_snprintf(command, sizeof(command),
 395                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 396                                    (*model->trigger_slopes)[i]);
 397
 398                         ret = sr_scpi_send(sdi->conn, command);
 399                         break;
 400                 }
 401                 break;
 402         case SR_CONF_COUPLING:
 403                 if (cg_type == CG_NONE) {
 404                         sr_err("No channel group specified.");
 405                         return SR_ERR_CHANNEL_GROUP;
 406                 }
 407
 408                 tmp = g_variant_get_string(data, NULL);
 409
 410                 for (i = 0; (*model->coupling_options)[i]; i++) {
 411                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 412                                 continue;
 413                         for (j = 1; j <= model->analog_channels; j++) {
 414                                 if (cg != devc->analog_groups[j - 1])
 415                                         continue;
 416                                 state->analog_channels[j-1].coupling = i;
 417
 418                                 g_snprintf(command, sizeof(command),
 419                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 420                                            j, tmp);
 421
 422                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 423                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 424                                         return SR_ERR;
 425                                 break;
 426                         }
 427
 428                         ret = SR_OK;
 429                         break;
 430                 }
 431                 break;
 432         default:
 433                 ret = SR_ERR_NA;
 434                 break;
 435         }
 436
 437         if (ret == SR_OK)
 438                 ret = sr_scpi_get_opc(sdi->conn);
 439
 440         if (ret == SR_OK && update_sample_rate)
 441                 ret = hmo_update_sample_rate(sdi);
 442
 443         return ret;
 444 }
 445
 446 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 447                        const struct sr_channel_group *cg)
 448 {
 449         int cg_type = CG_NONE;
 450         struct dev_context *devc = NULL;
 451         const struct scope_config *model = NULL;
 452
 453         if (sdi) {
 454                 devc = sdi->priv;
 455                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 456                         return SR_ERR;
 457
 458                 model = devc->model_config;
 459         }
 460
 461         switch (key) {
 462         case SR_CONF_SCAN_OPTIONS:
 463                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(scanopts));
 464                 break;
 465         case SR_CONF_DEVICE_OPTIONS:
 466                 if (cg_type == CG_NONE) {
 467                         if (model)
 468                                 *data = std_gvar_array_u32((const uint32_t *)model->devopts, model->num_devopts);
 469                         else
 470                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(drvopts));
 471                 } else if (cg_type == CG_ANALOG) {
 472                         *data = std_gvar_array_u32((const uint32_t *)model->devopts_cg_analog, model->num_devopts_cg_analog);
 473                 } else {
 474                         *data = std_gvar_array_u32(NULL, 0);
 475                 }
 476                 break;
 477         case SR_CONF_COUPLING:
 478                 if (cg_type == CG_NONE)
 479                         return SR_ERR_CHANNEL_GROUP;
 480                 *data = g_variant_new_strv(*model->coupling_options,
 481                            g_strv_length((char **)*model->coupling_options));
 482                 break;
 483         case SR_CONF_TRIGGER_SOURCE:
 484                 if (!model)
 485                         return SR_ERR_ARG;
 486                 *data = g_variant_new_strv(*model->trigger_sources,
 487                            g_strv_length((char **)*model->trigger_sources));
 488                 break;
 489         case SR_CONF_TRIGGER_SLOPE:
 490                 if (!model)
 491                         return SR_ERR_ARG;
 492                 *data = g_variant_new_strv(*model->trigger_slopes,
 493                            g_strv_length((char **)*model->trigger_slopes));
 494                 break;
 495         case SR_CONF_TIMEBASE:
 496                 if (!model)
 497                         return SR_ERR_ARG;
 498                 *data = std_gvar_tuple_array(*model->timebases, model->num_timebases);
 499                 break;
 500         case SR_CONF_VDIV:
 501                 if (cg_type == CG_NONE)
 502                         return SR_ERR_CHANNEL_GROUP;
 503                 *data = std_gvar_tuple_array(*model->vdivs, model->num_vdivs);
 504                 break;
 505         default:
 506                 return SR_ERR_NA;
 507         }
 508
 509         return SR_OK;
 510 }
 511
 512 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 513 {
 514         char command[MAX_COMMAND_SIZE];
 515         struct sr_channel *ch;
 516         struct dev_context *devc;
 517         const struct scope_config *model;
 518
 519         devc = sdi->priv;
 520         model = devc->model_config;
 521
 522         ch = devc->current_channel->data;
 523
 524         switch (ch->type) {
 525         case SR_CHANNEL_ANALOG:
 526                 g_snprintf(command, sizeof(command),
 527                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 528 #ifdef WORDS_BIGENDIAN
 529                            "MSBF",
 530 #else
 531                            "LSBF",
 532 #endif
 533                            ch->index + 1);
 534                 break;
 535         case SR_CHANNEL_LOGIC:
 536                 g_snprintf(command, sizeof(command),
 537                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 538                            ch->index < 8 ? 1 : 2);
 539                 break;
 540         default:
 541                 sr_err("Invalid channel type.");
 542                 break;
 543         }
 544
 545         return sr_scpi_send(sdi->conn, command);
 546 }
 547
 548 static int hmo_check_channels(GSList *channels)
 549 {
 550         GSList *l;
 551         struct sr_channel *ch;
 552         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 553         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 554         size_t idx;
 555
 556         /* Preset "not enabled" for all channels / pods. */
 557         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 558                 enabled_chan[idx] = FALSE;
 559         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 560                 enabled_pod[idx] = FALSE;
 561
 562         /*
 563          * Determine which channels / pods are required for the caller's
 564          * specified configuration.
 565          */
 566         for (l = channels; l; l = l->next) {
 567                 ch = l->data;
 568                 switch (ch->type) {
 569                 case SR_CHANNEL_ANALOG:
 570                         idx = ch->index;
 571                         if (idx < ARRAY_SIZE(enabled_chan))
 572                                 enabled_chan[idx] = TRUE;
 573                         break;
 574                 case SR_CHANNEL_LOGIC:
 575                         idx = ch->index / 8;
 576                         if (idx < ARRAY_SIZE(enabled_pod))
 577                                 enabled_pod[idx] = TRUE;
 578                         break;
 579                 default:
 580                         return SR_ERR;
 581                 }
 582         }
 583
 584         /*
 585          * Check for resource conflicts. Some channels can be either
 586          * analog or digital, but never both at the same time.
 587          *
 588          * Note that the constraints might depend on the specific model.
 589          * These tests might need some adjustment when support for more
 590          * models gets added to the driver.
 591          */
 592         if (enabled_pod[0] && enabled_chan[2])
 593                 return SR_ERR;
 594         if (enabled_pod[1] && enabled_chan[3])
 595                 return SR_ERR;
 596         return SR_OK;
 597 }
 598
 599 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 600 {
 601         GSList *l;
 602         unsigned int i;
 603         gboolean *pod_enabled, setup_changed;
 604         char command[MAX_COMMAND_SIZE];
 605         struct scope_state *state;
 606         const struct scope_config *model;
 607         struct sr_channel *ch;
 608         struct dev_context *devc;
 609         struct sr_scpi_dev_inst *scpi;
 610
 611         devc = sdi->priv;
 612         scpi = sdi->conn;
 613         state = devc->model_state;
 614         model = devc->model_config;
 615         setup_changed = FALSE;
 616
 617         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 618
 619         for (l = sdi->channels; l; l = l->next) {
 620                 ch = l->data;
 621                 switch (ch->type) {
 622                 case SR_CHANNEL_ANALOG:
 623                         if (ch->enabled == state->analog_channels[ch->index].state)
 624                                 break;
 625                         g_snprintf(command, sizeof(command),
 626                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 627                                    ch->index + 1, ch->enabled);
 628
 629                         if (sr_scpi_send(scpi, command) != SR_OK)
 630                                 return SR_ERR;
 631                         state->analog_channels[ch->index].state = ch->enabled;
 632                         setup_changed = TRUE;
 633                         break;
 634                 case SR_CHANNEL_LOGIC:
 635                         /*
 636                          * A digital POD needs to be enabled for every group of
 637                          * 8 channels.
 638                          */
 639                         if (ch->enabled)
 640                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 641
 642                         if (ch->enabled == state->digital_channels[ch->index])
 643                                 break;
 644                         g_snprintf(command, sizeof(command),
 645                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 646                                    ch->index, ch->enabled);
 647
 648                         if (sr_scpi_send(scpi, command) != SR_OK)
 649                                 return SR_ERR;
 650
 651                         state->digital_channels[ch->index] = ch->enabled;
 652                         setup_changed = TRUE;
 653                         break;
 654                 default:
 655                         return SR_ERR;
 656                 }
 657         }
 658
 659         for (i = 1; i <= model->digital_pods; i++) {
 660                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 661                         continue;
 662                 g_snprintf(command, sizeof(command),
 663                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 664                            i, pod_enabled[i - 1]);
 665                 if (sr_scpi_send(scpi, command) != SR_OK)
 666                         return SR_ERR;
 667                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 668                 setup_changed = TRUE;
 669         }
 670
 671         g_free(pod_enabled);
 672
 673         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 674                 return SR_ERR;
 675
 676         return SR_OK;
 677 }
 678
 679 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 680 {
 681         GSList *l;
 682         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 683         size_t group, pod_count;
 684         struct sr_channel *ch;
 685         struct dev_context *devc;
 686         struct sr_scpi_dev_inst *scpi;
 687         int ret;
 688
 689         scpi = sdi->conn;
 690         devc = sdi->priv;
 691
 692         /* Preset empty results. */
 693         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 694                 digital_added[group] = FALSE;
 695         g_slist_free(devc->enabled_channels);
 696         devc->enabled_channels = NULL;
 697
 698         /*
 699          * Contruct the list of enabled channels. Determine the highest
 700          * number of digital pods involved in the acquisition.
 701          */
 702         pod_count = 0;
 703         for (l = sdi->channels; l; l = l->next) {
 704                 ch = l->data;
 705                 if (!ch->enabled)
 706                         continue;
 707                 /* Only add a single digital channel per group (pod). */
 708                 group = ch->index / 8;
 709                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 710                         devc->enabled_channels = g_slist_append(
 711                                         devc->enabled_channels, ch);
 712                         if (ch->type == SR_CHANNEL_LOGIC) {
 713                                 digital_added[group] = TRUE;
 714                                 if (pod_count < group + 1)
 715                                         pod_count = group + 1;
 716                         }
 717                 }
 718         }
 719         if (!devc->enabled_channels)
 720                 return SR_ERR;
 721         devc->pod_count = pod_count;
 722         devc->logic_data = NULL;
 723
 724         /*
 725          * Check constraints. Some channels can be either analog or
 726          * digital, but not both at the same time.
 727          */
 728         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 729                 sr_err("Invalid channel configuration specified!");
 730                 ret = SR_ERR_NA;
 731                 goto free_enabled;
 732         }
 733
 734         /*
 735          * Configure the analog and digital channels and the
 736          * corresponding digital pods.
 737          */
 738         if (hmo_setup_channels(sdi) != SR_OK) {
 739                 sr_err("Failed to setup channel configuration!");
 740                 ret = SR_ERR;
 741                 goto free_enabled;
 742         }
 743
 744         /*
 745          * Start acquisition on the first enabled channel. The
 746          * receive routine will continue driving the acquisition.
 747          */
 748         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 749                         hmo_receive_data, (void *)sdi);
 750
 751         std_session_send_df_header(sdi);
 752
 753         devc->current_channel = devc->enabled_channels;
 754
 755         return hmo_request_data(sdi);
 756
 757 free_enabled:
 758         g_slist_free(devc->enabled_channels);
 759         devc->enabled_channels = NULL;
 760         return ret;
 761 }
 762
 763 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 764 {
 765         struct dev_context *devc;
 766         struct sr_scpi_dev_inst *scpi;
 767
 768         std_session_send_df_end(sdi);
 769
 770         devc = sdi->priv;
 771
 772         devc->num_frames = 0;
 773         g_slist_free(devc->enabled_channels);
 774         devc->enabled_channels = NULL;
 775         scpi = sdi->conn;
 776         sr_scpi_source_remove(sdi->session, scpi);
 777
 778         return SR_OK;
 779 }
 780
 781 static struct sr_dev_driver hameg_hmo_driver_info = {
 782         .name = "hameg-hmo",
 783         .longname = "Hameg HMO",
 784         .api_version = 1,
 785         .init = std_init,
 786         .cleanup = std_cleanup,
 787         .scan = scan,
 788         .dev_list = std_dev_list,
 789         .dev_clear = dev_clear,
 790         .config_get = config_get,
 791         .config_set = config_set,
 792         .config_list = config_list,
 793         .dev_open = dev_open,
 794         .dev_close = dev_close,
 795         .dev_acquisition_start = dev_acquisition_start,
 796         .dev_acquisition_stop = dev_acquisition_stop,
 797         .context = NULL,
 798 };
 799 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);