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 drvopts[] = {
  35         SR_CONF_OSCILLOSCOPE,
  36 };
  37
  38 static const uint32_t scanopts[] = {
  39         SR_CONF_CONN,
  40         SR_CONF_SERIALCOMM,
  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(void *priv)
 114 {
 115         struct dev_context *devc;
 116
 117         devc = priv;
 118
 119         hmo_scope_state_free(devc->model_state);
 120
 121         g_free(devc->analog_groups);
 122         g_free(devc->digital_groups);
 123
 124         g_free(devc);
 125 }
 126
 127 static int dev_clear(const struct sr_dev_driver *di)
 128 {
 129         return std_dev_clear(di, clear_helper);
 130 }
 131
 132 static int dev_open(struct sr_dev_inst *sdi)
 133 {
 134         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 135                 return SR_ERR;
 136
 137         if (hmo_scope_state_get(sdi) != SR_OK)
 138                 return SR_ERR;
 139
 140         sdi->status = SR_ST_ACTIVE;
 141
 142         return SR_OK;
 143 }
 144
 145 static int dev_close(struct sr_dev_inst *sdi)
 146 {
 147         sr_scpi_close(sdi->conn);
 148
 149         sdi->status = SR_ST_INACTIVE;
 150
 151         return SR_OK;
 152 }
 153
 154 static int check_channel_group(struct dev_context *devc,
 155                              const struct sr_channel_group *cg)
 156 {
 157         unsigned int i;
 158         const struct scope_config *model;
 159
 160         model = devc->model_config;
 161
 162         if (!cg)
 163                 return CG_NONE;
 164
 165         for (i = 0; i < model->analog_channels; i++)
 166                 if (cg == devc->analog_groups[i])
 167                         return CG_ANALOG;
 168
 169         for (i = 0; i < model->digital_pods; i++)
 170                 if (cg == devc->digital_groups[i])
 171                         return CG_DIGITAL;
 172
 173         sr_err("Invalid channel group specified.");
 174
 175         return CG_INVALID;
 176 }
 177
 178 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 179                       const struct sr_channel_group *cg)
 180 {
 181         int ret, cg_type;
 182         unsigned int i;
 183         struct dev_context *devc;
 184         const struct scope_config *model;
 185         struct scope_state *state;
 186
 187         if (!sdi)
 188                 return SR_ERR_ARG;
 189
 190         devc = sdi->priv;
 191
 192         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 193                 return SR_ERR;
 194
 195         ret = SR_ERR_NA;
 196         model = devc->model_config;
 197         state = devc->model_state;
 198
 199         switch (key) {
 200         case SR_CONF_NUM_HDIV:
 201                 *data = g_variant_new_int32(model->num_xdivs);
 202                 ret = SR_OK;
 203                 break;
 204         case SR_CONF_TIMEBASE:
 205                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 206                                       (*model->timebases)[state->timebase][1]);
 207                 ret = SR_OK;
 208                 break;
 209         case SR_CONF_NUM_VDIV:
 210                 if (cg_type == CG_NONE) {
 211                         sr_err("No channel group specified.");
 212                         return SR_ERR_CHANNEL_GROUP;
 213                 } else if (cg_type == CG_ANALOG) {
 214                         for (i = 0; i < model->analog_channels; i++) {
 215                                 if (cg != devc->analog_groups[i])
 216                                         continue;
 217                                 *data = g_variant_new_int32(model->num_ydivs);
 218                                 ret = SR_OK;
 219                                 break;
 220                         }
 221
 222                 } else {
 223                         ret = SR_ERR_NA;
 224                 }
 225                 break;
 226         case SR_CONF_VDIV:
 227                 if (cg_type == CG_NONE) {
 228                         sr_err("No channel group specified.");
 229                         return SR_ERR_CHANNEL_GROUP;
 230                 } else if (cg_type == CG_ANALOG) {
 231                         for (i = 0; i < model->analog_channels; i++) {
 232                                 if (cg != devc->analog_groups[i])
 233                                         continue;
 234                                 *data = g_variant_new("(tt)",
 235                                                       (*model->vdivs)[state->analog_channels[i].vdiv][0],
 236                                                       (*model->vdivs)[state->analog_channels[i].vdiv][1]);
 237                                 ret = SR_OK;
 238                                 break;
 239                         }
 240
 241                 } else {
 242                         ret = SR_ERR_NA;
 243                 }
 244                 break;
 245         case SR_CONF_TRIGGER_SOURCE:
 246                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 247                 ret = SR_OK;
 248                 break;
 249         case SR_CONF_TRIGGER_SLOPE:
 250                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 251                 ret = SR_OK;
 252                 break;
 253         case SR_CONF_HORIZ_TRIGGERPOS:
 254                 *data = g_variant_new_double(state->horiz_triggerpos);
 255                 ret = SR_OK;
 256                 break;
 257         case SR_CONF_COUPLING:
 258                 if (cg_type == CG_NONE) {
 259                         sr_err("No channel group specified.");
 260                         return SR_ERR_CHANNEL_GROUP;
 261                 } else if (cg_type == CG_ANALOG) {
 262                         for (i = 0; i < model->analog_channels; i++) {
 263                                 if (cg != devc->analog_groups[i])
 264                                         continue;
 265                                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[i].coupling]);
 266                                 ret = SR_OK;
 267                                 break;
 268                         }
 269
 270                 } else {
 271                         ret = SR_ERR_NA;
 272                 }
 273                 break;
 274         case SR_CONF_SAMPLERATE:
 275                 *data = g_variant_new_uint64(state->sample_rate);
 276                 ret = SR_OK;
 277                 break;
 278         default:
 279                 ret = SR_ERR_NA;
 280         }
 281
 282         return ret;
 283 }
 284
 285 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 286 {
 287         unsigned int i;
 288         GVariant *rational[2];
 289         GVariantBuilder gvb;
 290
 291         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 292
 293         for (i = 0; i < n; i++) {
 294                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 295                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 296
 297                 /* FIXME: Valgrind reports a memory leak here. */
 298                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 299         }
 300
 301         return g_variant_builder_end(&gvb);
 302 }
 303
 304 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 305                       const struct sr_channel_group *cg)
 306 {
 307         int ret, cg_type;
 308         unsigned int i, j;
 309         char command[MAX_COMMAND_SIZE], float_str[30];
 310         struct dev_context *devc;
 311         const struct scope_config *model;
 312         struct scope_state *state;
 313         const char *tmp;
 314         uint64_t p, q;
 315         double tmp_d;
 316         gboolean update_sample_rate;
 317
 318         if (!sdi)
 319                 return SR_ERR_ARG;
 320
 321         devc = sdi->priv;
 322
 323         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 324                 return SR_ERR;
 325
 326         model = devc->model_config;
 327         state = devc->model_state;
 328         update_sample_rate = FALSE;
 329
 330         ret = SR_ERR_NA;
 331
 332         switch (key) {
 333         case SR_CONF_LIMIT_FRAMES:
 334                 devc->frame_limit = g_variant_get_uint64(data);
 335                 ret = SR_OK;
 336                 break;
 337         case SR_CONF_TRIGGER_SOURCE:
 338                 tmp = g_variant_get_string(data, NULL);
 339                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 340                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 341                                 continue;
 342                         state->trigger_source = i;
 343                         g_snprintf(command, sizeof(command),
 344                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 345                                    (*model->trigger_sources)[i]);
 346
 347                         ret = sr_scpi_send(sdi->conn, command);
 348                         break;
 349                 }
 350                 break;
 351         case SR_CONF_VDIV:
 352                 if (cg_type == CG_NONE) {
 353                         sr_err("No channel group specified.");
 354                         return SR_ERR_CHANNEL_GROUP;
 355                 }
 356
 357                 g_variant_get(data, "(tt)", &p, &q);
 358
 359                 for (i = 0; i < model->num_vdivs; i++) {
 360                         if (p != (*model->vdivs)[i][0] ||
 361                             q != (*model->vdivs)[i][1])
 362                                 continue;
 363                         for (j = 1; j <= model->analog_channels; j++) {
 364                                 if (cg != devc->analog_groups[j - 1])
 365                                         continue;
 366                                 state->analog_channels[j - 1].vdiv = i;
 367                                 g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 368                                 g_snprintf(command, sizeof(command),
 369                                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 370                                            j, float_str);
 371
 372                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 373                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 374                                         return SR_ERR;
 375
 376                                 break;
 377                         }
 378
 379                         ret = SR_OK;
 380                         break;
 381                 }
 382                 break;
 383         case SR_CONF_TIMEBASE:
 384                 g_variant_get(data, "(tt)", &p, &q);
 385
 386                 for (i = 0; i < model->num_timebases; i++) {
 387                         if (p != (*model->timebases)[i][0] ||
 388                             q != (*model->timebases)[i][1])
 389                                 continue;
 390                         state->timebase = i;
 391                         g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 392                         g_snprintf(command, sizeof(command),
 393                                    (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 394                                    float_str);
 395
 396                         ret = sr_scpi_send(sdi->conn, command);
 397                         update_sample_rate = TRUE;
 398                         break;
 399                 }
 400                 break;
 401         case SR_CONF_HORIZ_TRIGGERPOS:
 402                 tmp_d = g_variant_get_double(data);
 403
 404                 if (tmp_d < 0.0 || tmp_d > 1.0)
 405                         return SR_ERR;
 406
 407                 state->horiz_triggerpos = tmp_d;
 408                 tmp_d = -(tmp_d - 0.5) *
 409                         ((double) (*model->timebases)[state->timebase][0] /
 410                         (*model->timebases)[state->timebase][1])
 411                          * model->num_xdivs;
 412
 413                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 414                 g_snprintf(command, sizeof(command),
 415                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 416                            float_str);
 417
 418                 ret = sr_scpi_send(sdi->conn, command);
 419                 break;
 420         case SR_CONF_TRIGGER_SLOPE:
 421                 tmp = g_variant_get_string(data, NULL);
 422                 for (i = 0; (*model->trigger_slopes)[i]; i++) {
 423                         if (g_strcmp0(tmp, (*model->trigger_slopes)[i]) != 0)
 424                                 continue;
 425                         state->trigger_slope = i;
 426                         g_snprintf(command, sizeof(command),
 427                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 428                                    (*model->trigger_slopes)[i]);
 429
 430                         ret = sr_scpi_send(sdi->conn, command);
 431                         break;
 432                 }
 433                 break;
 434         case SR_CONF_COUPLING:
 435                 if (cg_type == CG_NONE) {
 436                         sr_err("No channel group specified.");
 437                         return SR_ERR_CHANNEL_GROUP;
 438                 }
 439
 440                 tmp = g_variant_get_string(data, NULL);
 441
 442                 for (i = 0; (*model->coupling_options)[i]; i++) {
 443                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 444                                 continue;
 445                         for (j = 1; j <= model->analog_channels; j++) {
 446                                 if (cg != devc->analog_groups[j - 1])
 447                                         continue;
 448                                 state->analog_channels[j-1].coupling = i;
 449
 450                                 g_snprintf(command, sizeof(command),
 451                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 452                                            j, tmp);
 453
 454                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 455                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 456                                         return SR_ERR;
 457                                 break;
 458                         }
 459
 460                         ret = SR_OK;
 461                         break;
 462                 }
 463                 break;
 464         default:
 465                 ret = SR_ERR_NA;
 466                 break;
 467         }
 468
 469         if (ret == SR_OK)
 470                 ret = sr_scpi_get_opc(sdi->conn);
 471
 472         if (ret == SR_OK && update_sample_rate)
 473                 ret = hmo_update_sample_rate(sdi);
 474
 475         return ret;
 476 }
 477
 478 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 479                        const struct sr_channel_group *cg)
 480 {
 481         int cg_type = CG_NONE;
 482         struct dev_context *devc = NULL;
 483         const struct scope_config *model = NULL;
 484
 485         if (sdi) {
 486                 devc = sdi->priv;
 487                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 488                         return SR_ERR;
 489
 490                 model = devc->model_config;
 491         }
 492
 493         switch (key) {
 494         case SR_CONF_SCAN_OPTIONS:
 495                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 496                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 497                 break;
 498         case SR_CONF_DEVICE_OPTIONS:
 499                 if (cg_type == CG_NONE) {
 500                         if (model)
 501                                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 502                                         model->devopts, model->num_devopts, sizeof(uint32_t));
 503                         else
 504                                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 505                                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 506                 } else if (cg_type == CG_ANALOG) {
 507                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 508                                 model->analog_devopts, model->num_analog_devopts,
 509                                 sizeof(uint32_t));
 510                 } else {
 511                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 512                                 NULL, 0, sizeof(uint32_t));
 513                 }
 514                 break;
 515         case SR_CONF_COUPLING:
 516                 if (cg_type == CG_NONE)
 517                         return SR_ERR_CHANNEL_GROUP;
 518                 *data = g_variant_new_strv(*model->coupling_options,
 519                            g_strv_length((char **)*model->coupling_options));
 520                 break;
 521         case SR_CONF_TRIGGER_SOURCE:
 522                 if (!model)
 523                         return SR_ERR_ARG;
 524                 *data = g_variant_new_strv(*model->trigger_sources,
 525                            g_strv_length((char **)*model->trigger_sources));
 526                 break;
 527         case SR_CONF_TRIGGER_SLOPE:
 528                 if (!model)
 529                         return SR_ERR_ARG;
 530                 *data = g_variant_new_strv(*model->trigger_slopes,
 531                            g_strv_length((char **)*model->trigger_slopes));
 532                 break;
 533         case SR_CONF_TIMEBASE:
 534                 if (!model)
 535                         return SR_ERR_ARG;
 536                 *data = build_tuples(model->timebases, model->num_timebases);
 537                 break;
 538         case SR_CONF_VDIV:
 539                 if (cg_type == CG_NONE)
 540                         return SR_ERR_CHANNEL_GROUP;
 541                 *data = build_tuples(model->vdivs, model->num_vdivs);
 542                 break;
 543         default:
 544                 return SR_ERR_NA;
 545         }
 546
 547         return SR_OK;
 548 }
 549
 550 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 551 {
 552         char command[MAX_COMMAND_SIZE];
 553         struct sr_channel *ch;
 554         struct dev_context *devc;
 555         const struct scope_config *model;
 556
 557         devc = sdi->priv;
 558         model = devc->model_config;
 559
 560         ch = devc->current_channel->data;
 561
 562         switch (ch->type) {
 563         case SR_CHANNEL_ANALOG:
 564                 g_snprintf(command, sizeof(command),
 565                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 566 #ifdef WORDS_BIGENDIAN
 567                            "MSBF",
 568 #else
 569                            "LSBF",
 570 #endif
 571                            ch->index + 1);
 572                 break;
 573         case SR_CHANNEL_LOGIC:
 574                 g_snprintf(command, sizeof(command),
 575                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 576                            ch->index < 8 ? 1 : 2);
 577                 break;
 578         default:
 579                 sr_err("Invalid channel type.");
 580                 break;
 581         }
 582
 583         return sr_scpi_send(sdi->conn, command);
 584 }
 585
 586 static int hmo_check_channels(GSList *channels)
 587 {
 588         GSList *l;
 589         struct sr_channel *ch;
 590         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 591         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 592         size_t idx;
 593
 594         /* Preset "not enabled" for all channels / pods. */
 595         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 596                 enabled_chan[idx] = FALSE;
 597         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 598                 enabled_pod[idx] = FALSE;
 599
 600         /*
 601          * Determine which channels / pods are required for the caller's
 602          * specified configuration.
 603          */
 604         for (l = channels; l; l = l->next) {
 605                 ch = l->data;
 606                 switch (ch->type) {
 607                 case SR_CHANNEL_ANALOG:
 608                         idx = ch->index;
 609                         if (idx < ARRAY_SIZE(enabled_chan))
 610                                 enabled_chan[idx] = TRUE;
 611                         break;
 612                 case SR_CHANNEL_LOGIC:
 613                         idx = ch->index / 8;
 614                         if (idx < ARRAY_SIZE(enabled_pod))
 615                                 enabled_pod[idx] = TRUE;
 616                         break;
 617                 default:
 618                         return SR_ERR;
 619                 }
 620         }
 621
 622         /*
 623          * Check for resource conflicts. Some channels can be either
 624          * analog or digital, but never both at the same time.
 625          *
 626          * Note that the constraints might depend on the specific model.
 627          * These tests might need some adjustment when support for more
 628          * models gets added to the driver.
 629          */
 630         if (enabled_pod[0] && enabled_chan[2])
 631                 return SR_ERR;
 632         if (enabled_pod[1] && enabled_chan[3])
 633                 return SR_ERR;
 634         return SR_OK;
 635 }
 636
 637 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 638 {
 639         GSList *l;
 640         unsigned int i;
 641         gboolean *pod_enabled, setup_changed;
 642         char command[MAX_COMMAND_SIZE];
 643         struct scope_state *state;
 644         const struct scope_config *model;
 645         struct sr_channel *ch;
 646         struct dev_context *devc;
 647         struct sr_scpi_dev_inst *scpi;
 648
 649         devc = sdi->priv;
 650         scpi = sdi->conn;
 651         state = devc->model_state;
 652         model = devc->model_config;
 653         setup_changed = FALSE;
 654
 655         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 656
 657         for (l = sdi->channels; l; l = l->next) {
 658                 ch = l->data;
 659                 switch (ch->type) {
 660                 case SR_CHANNEL_ANALOG:
 661                         if (ch->enabled == state->analog_channels[ch->index].state)
 662                                 break;
 663                         g_snprintf(command, sizeof(command),
 664                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 665                                    ch->index + 1, ch->enabled);
 666
 667                         if (sr_scpi_send(scpi, command) != SR_OK)
 668                                 return SR_ERR;
 669                         state->analog_channels[ch->index].state = ch->enabled;
 670                         setup_changed = TRUE;
 671                         break;
 672                 case SR_CHANNEL_LOGIC:
 673                         /*
 674                          * A digital POD needs to be enabled for every group of
 675                          * 8 channels.
 676                          */
 677                         if (ch->enabled)
 678                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 679
 680                         if (ch->enabled == state->digital_channels[ch->index])
 681                                 break;
 682                         g_snprintf(command, sizeof(command),
 683                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 684                                    ch->index, ch->enabled);
 685
 686                         if (sr_scpi_send(scpi, command) != SR_OK)
 687                                 return SR_ERR;
 688
 689                         state->digital_channels[ch->index] = ch->enabled;
 690                         setup_changed = TRUE;
 691                         break;
 692                 default:
 693                         return SR_ERR;
 694                 }
 695         }
 696
 697         for (i = 1; i <= model->digital_pods; i++) {
 698                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 699                         continue;
 700                 g_snprintf(command, sizeof(command),
 701                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 702                            i, pod_enabled[i - 1]);
 703                 if (sr_scpi_send(scpi, command) != SR_OK)
 704                         return SR_ERR;
 705                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 706                 setup_changed = TRUE;
 707         }
 708
 709         g_free(pod_enabled);
 710
 711         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 712                 return SR_ERR;
 713
 714         return SR_OK;
 715 }
 716
 717 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 718 {
 719         GSList *l;
 720         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 721         size_t group, pod_count;
 722         struct sr_channel *ch;
 723         struct dev_context *devc;
 724         struct sr_scpi_dev_inst *scpi;
 725         int ret;
 726
 727         scpi = sdi->conn;
 728         devc = sdi->priv;
 729
 730         /* Preset empty results. */
 731         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 732                 digital_added[group] = FALSE;
 733         g_slist_free(devc->enabled_channels);
 734         devc->enabled_channels = NULL;
 735
 736         /*
 737          * Contruct the list of enabled channels. Determine the highest
 738          * number of digital pods involved in the acquisition.
 739          */
 740         pod_count = 0;
 741         for (l = sdi->channels; l; l = l->next) {
 742                 ch = l->data;
 743                 if (!ch->enabled)
 744                         continue;
 745                 /* Only add a single digital channel per group (pod). */
 746                 group = ch->index / 8;
 747                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 748                         devc->enabled_channels = g_slist_append(
 749                                         devc->enabled_channels, ch);
 750                         if (ch->type == SR_CHANNEL_LOGIC) {
 751                                 digital_added[group] = TRUE;
 752                                 if (pod_count < group + 1)
 753                                         pod_count = group + 1;
 754                         }
 755                 }
 756         }
 757         if (!devc->enabled_channels)
 758                 return SR_ERR;
 759         devc->pod_count = pod_count;
 760         devc->logic_data = NULL;
 761
 762         /*
 763          * Check constraints. Some channels can be either analog or
 764          * digital, but not both at the same time.
 765          */
 766         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 767                 sr_err("Invalid channel configuration specified!");
 768                 ret = SR_ERR_NA;
 769                 goto free_enabled;
 770         }
 771
 772         /*
 773          * Configure the analog and digital channels and the
 774          * corresponding digital pods.
 775          */
 776         if (hmo_setup_channels(sdi) != SR_OK) {
 777                 sr_err("Failed to setup channel configuration!");
 778                 ret = SR_ERR;
 779                 goto free_enabled;
 780         }
 781
 782         /*
 783          * Start acquisition on the first enabled channel. The
 784          * receive routine will continue driving the acquisition.
 785          */
 786         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 787                         hmo_receive_data, (void *)sdi);
 788
 789         std_session_send_df_header(sdi);
 790
 791         devc->current_channel = devc->enabled_channels;
 792
 793         return hmo_request_data(sdi);
 794
 795 free_enabled:
 796         g_slist_free(devc->enabled_channels);
 797         devc->enabled_channels = NULL;
 798         return ret;
 799 }
 800
 801 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 802 {
 803         struct dev_context *devc;
 804         struct sr_scpi_dev_inst *scpi;
 805
 806         std_session_send_df_end(sdi);
 807
 808         devc = sdi->priv;
 809
 810         devc->num_frames = 0;
 811         g_slist_free(devc->enabled_channels);
 812         devc->enabled_channels = NULL;
 813         scpi = sdi->conn;
 814         sr_scpi_source_remove(sdi->session, scpi);
 815
 816         return SR_OK;
 817 }
 818
 819 static struct sr_dev_driver hameg_hmo_driver_info = {
 820         .name = "hameg-hmo",
 821         .longname = "Hameg HMO",
 822         .api_version = 1,
 823         .init = std_init,
 824         .cleanup = std_cleanup,
 825         .scan = scan,
 826         .dev_list = std_dev_list,
 827         .dev_clear = dev_clear,
 828         .config_get = config_get,
 829         .config_set = config_set,
 830         .config_list = config_list,
 831         .dev_open = dev_open,
 832         .dev_close = dev_close,
 833         .dev_acquisition_start = dev_acquisition_start,
 834         .dev_acquisition_stop = dev_acquisition_stop,
 835         .context = NULL,
 836 };
 837 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);