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 <stdlib.h>
  21 #include "protocol.h"
  22
  23 #define SERIALCOMM "115200/8n1/flow=1"
  24
  25 SR_PRIV struct sr_dev_driver hameg_hmo_driver_info;
  26 static struct sr_dev_driver *di = &hameg_hmo_driver_info;
  27
  28 static const char *manufacturers[] = {
  29         "HAMEG",
  30 };
  31
  32 static const int32_t hwopts[] = {
  33         SR_CONF_CONN,
  34         SR_CONF_SERIALCOMM,
  35 };
  36
  37 enum {
  38         CG_INVALID = -1,
  39         CG_NONE,
  40         CG_ANALOG,
  41         CG_DIGITAL,
  42 };
  43
  44 static int init(struct sr_context *sr_ctx)
  45 {
  46         return std_init(sr_ctx, di, LOG_PREFIX);
  47 }
  48
  49 static int check_manufacturer(const char *manufacturer)
  50 {
  51         unsigned int i;
  52
  53         for (i = 0; i < ARRAY_SIZE(manufacturers); ++i)
  54                 if (!strcmp(manufacturer, manufacturers[i]))
  55                         return SR_OK;
  56
  57         return SR_ERR;
  58 }
  59
  60 static struct sr_dev_inst *hmo_probe_serial_device(struct sr_scpi_dev_inst *scpi)
  61 {
  62         struct sr_dev_inst *sdi;
  63         struct dev_context *devc;
  64         struct sr_scpi_hw_info *hw_info;
  65
  66         sdi = NULL;
  67         devc = NULL;
  68         hw_info = NULL;
  69
  70         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  71                 sr_info("Couldn't get IDN response.");
  72                 goto fail;
  73         }
  74
  75         if (check_manufacturer(hw_info->manufacturer) != SR_OK)
  76                 goto fail;
  77
  78         if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE,
  79                                     hw_info->manufacturer, hw_info->model,
  80                                     hw_info->firmware_version))) {
  81                 goto fail;
  82         }
  83         sr_scpi_hw_info_free(hw_info);
  84         hw_info = NULL;
  85
  86         if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
  87                 goto fail;
  88
  89         sdi->driver = di;
  90         sdi->priv = devc;
  91         sdi->inst_type = SR_INST_SCPI;
  92         sdi->conn = scpi;
  93
  94         if (hmo_init_device(sdi) != SR_OK)
  95                 goto fail;
  96
  97         sr_scpi_close(sdi->conn);
  98
  99         sdi->status = SR_ST_INACTIVE;
 100
 101         return sdi;
 102
 103 fail:
 104         if (hw_info)
 105                 sr_scpi_hw_info_free(hw_info);
 106         if (sdi)
 107                 sr_dev_inst_free(sdi);
 108         if (devc)
 109                 g_free(devc);
 110
 111         return NULL;
 112 }
 113
 114 static GSList *scan(GSList *options)
 115 {
 116         return sr_scpi_scan(di->priv, options, hmo_probe_serial_device);
 117 }
 118
 119 static GSList *dev_list(void)
 120 {
 121         return ((struct drv_context *)(di->priv))->instances;
 122 }
 123
 124 static void clear_helper(void *priv)
 125 {
 126         unsigned int i;
 127         struct dev_context *devc;
 128         struct scope_config *model;
 129
 130         devc = priv;
 131         model = devc->model_config;
 132
 133         hmo_scope_state_free(devc->model_state);
 134
 135         for (i = 0; i < model->analog_channels; ++i)
 136                 g_slist_free(devc->analog_groups[i].channels);
 137
 138         for (i = 0; i < model->digital_pods; ++i) {
 139                 g_slist_free(devc->digital_groups[i].channels);
 140                 g_free(devc->digital_groups[i].name);
 141         }
 142
 143         g_free(devc->analog_groups);
 144         g_free(devc->digital_groups);
 145
 146         g_free(devc);
 147 }
 148
 149 static int dev_clear(void)
 150 {
 151         return std_dev_clear(di, clear_helper);
 152 }
 153
 154 static int dev_open(struct sr_dev_inst *sdi)
 155 {
 156         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 157                 return SR_ERR;
 158
 159         if (hmo_scope_state_get(sdi) != SR_OK)
 160                 return SR_ERR;
 161
 162         sdi->status = SR_ST_ACTIVE;
 163
 164         return SR_OK;
 165 }
 166
 167 static int dev_close(struct sr_dev_inst *sdi)
 168 {
 169         if (sdi->status == SR_ST_INACTIVE)
 170                 return SR_OK;
 171
 172         sr_scpi_close(sdi->conn);
 173
 174         sdi->status = SR_ST_INACTIVE;
 175
 176         return SR_OK;
 177 }
 178
 179 static int cleanup(void)
 180 {
 181         dev_clear();
 182
 183         return SR_OK;
 184 }
 185
 186 static int check_channel_group(struct dev_context *devc,
 187                              const struct sr_channel_group *cg)
 188 {
 189         unsigned int i;
 190         struct scope_config *model;
 191
 192         model = devc->model_config;
 193
 194         if (!cg)
 195                 return CG_NONE;
 196
 197         for (i = 0; i < model->analog_channels; ++i)
 198                 if (cg == &devc->analog_groups[i])
 199                         return CG_ANALOG;
 200
 201         for (i = 0; i < model->digital_pods; ++i)
 202                 if (cg == &devc->digital_groups[i])
 203                         return CG_DIGITAL;
 204
 205         sr_err("Invalid channel group specified.");
 206
 207         return CG_INVALID;
 208 }
 209
 210 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 211                       const struct sr_channel_group *cg)
 212 {
 213         int ret, cg_type;
 214         unsigned int i;
 215         struct dev_context *devc;
 216         struct scope_config *model;
 217         struct scope_state *state;
 218
 219         if (!sdi || !(devc = sdi->priv))
 220                 return SR_ERR_ARG;
 221
 222         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 223                 return SR_ERR;
 224
 225         ret = SR_ERR_NA;
 226         model = devc->model_config;
 227         state = devc->model_state;
 228
 229         switch (key) {
 230         case SR_CONF_NUM_TIMEBASE:
 231                 *data = g_variant_new_int32(model->num_xdivs);
 232                 ret = SR_OK;
 233                 break;
 234         case SR_CONF_TIMEBASE:
 235                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 236                                       (*model->timebases)[state->timebase][1]);
 237                 ret = SR_OK;
 238                 break;
 239         case SR_CONF_NUM_VDIV:
 240                 if (cg_type == CG_NONE) {
 241                         sr_err("No channel group specified.");
 242                         return SR_ERR_CHANNEL_GROUP;
 243                 } else if (cg_type == CG_ANALOG) {
 244                         for (i = 0; i < model->analog_channels; ++i) {
 245                                 if (cg != &devc->analog_groups[i])
 246                                         continue;
 247                                 *data = g_variant_new_int32(model->num_ydivs);
 248                                 ret = SR_OK;
 249                                 break;
 250                         }
 251
 252                 } else {
 253                         ret = SR_ERR_NA;
 254                 }
 255                 break;
 256         case SR_CONF_VDIV:
 257                 if (cg_type == CG_NONE) {
 258                         sr_err("No channel group specified.");
 259                         return SR_ERR_CHANNEL_GROUP;
 260                 } else if (cg_type == CG_ANALOG) {
 261                         for (i = 0; i < model->analog_channels; ++i) {
 262                                 if (cg != &devc->analog_groups[i])
 263                                         continue;
 264                                 *data = g_variant_new("(tt)",
 265                                                       (*model->vdivs)[state->analog_channels[i].vdiv][0],
 266                                                       (*model->vdivs)[state->analog_channels[i].vdiv][1]);
 267                                 ret = SR_OK;
 268                                 break;
 269                         }
 270
 271                 } else {
 272                         ret = SR_ERR_NA;
 273                 }
 274                 break;
 275         case SR_CONF_TRIGGER_SOURCE:
 276                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 277                 ret = SR_OK;
 278                 break;
 279         case SR_CONF_TRIGGER_SLOPE:
 280                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 281                 ret = SR_OK;
 282                 break;
 283         case SR_CONF_HORIZ_TRIGGERPOS:
 284                 *data = g_variant_new_double(state->horiz_triggerpos);
 285                 ret = SR_OK;
 286                 break;
 287         case SR_CONF_COUPLING:
 288                 if (cg_type == CG_NONE) {
 289                         sr_err("No channel group specified.");
 290                         return SR_ERR_CHANNEL_GROUP;
 291                 } else if (cg_type == CG_ANALOG) {
 292                         for (i = 0; i < model->analog_channels; ++i) {
 293                                 if (cg != &devc->analog_groups[i])
 294                                         continue;
 295                                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[i].coupling]);
 296                                 ret = SR_OK;
 297                                 break;
 298                         }
 299
 300                 } else {
 301                         ret = SR_ERR_NA;
 302                 }
 303                 break;
 304         case SR_CONF_SAMPLERATE:
 305                 *data = g_variant_new_uint64(state->sample_rate);
 306                 ret = SR_OK;
 307                 break;
 308         default:
 309                 ret = SR_ERR_NA;
 310         }
 311
 312         return ret;
 313 }
 314
 315 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 316 {
 317         unsigned int i;
 318         GVariant *rational[2];
 319         GVariantBuilder gvb;
 320
 321         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 322
 323         for (i = 0; i < n; i++) {
 324                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 325                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 326
 327                 /* FIXME: Valgrind reports a memory leak here. */
 328                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 329         }
 330
 331         return g_variant_builder_end(&gvb);
 332 }
 333
 334 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 335                       const struct sr_channel_group *cg)
 336 {
 337         int ret, cg_type;
 338         unsigned int i, j;
 339         char command[MAX_COMMAND_SIZE], float_str[30];
 340         struct dev_context *devc;
 341         struct scope_config *model;
 342         struct scope_state *state;
 343         const char *tmp;
 344         uint64_t p, q;
 345         double tmp_d;
 346         gboolean update_sample_rate;
 347
 348         if (!sdi || !(devc = sdi->priv))
 349                 return SR_ERR_ARG;
 350
 351         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 352                 return SR_ERR;
 353
 354         model = devc->model_config;
 355         state = devc->model_state;
 356         update_sample_rate = FALSE;
 357
 358         ret = SR_ERR_NA;
 359
 360         switch (key) {
 361         case SR_CONF_LIMIT_FRAMES:
 362                 devc->frame_limit = g_variant_get_uint64(data);
 363                 ret = SR_OK;
 364                 break;
 365         case SR_CONF_TRIGGER_SOURCE:
 366                 tmp = g_variant_get_string(data, NULL);
 367                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 368                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 369                                 continue;
 370                         state->trigger_source = i;
 371                         g_snprintf(command, sizeof(command),
 372                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 373                                    (*model->trigger_sources)[i]);
 374
 375                         ret = sr_scpi_send(sdi->conn, command);
 376                         break;
 377                 }
 378                 break;
 379         case SR_CONF_VDIV:
 380                 if (cg_type == CG_NONE) {
 381                         sr_err("No channel group specified.");
 382                         return SR_ERR_CHANNEL_GROUP;
 383                 }
 384
 385                 g_variant_get(data, "(tt)", &p, &q);
 386
 387                 for (i = 0; i < model->num_vdivs; i++) {
 388                         if (p != (*model->vdivs)[i][0] ||
 389                             q != (*model->vdivs)[i][1])
 390                                 continue;
 391                         for (j = 1; j <= model->analog_channels; ++j) {
 392                                 if (cg != &devc->analog_groups[j - 1])
 393                                         continue;
 394                                 state->analog_channels[j - 1].vdiv = i;
 395                                 g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 396                                 g_snprintf(command, sizeof(command),
 397                                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 398                                            j, float_str);
 399
 400                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 401                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 402                                         return SR_ERR;
 403
 404                                 break;
 405                         }
 406
 407                         ret = SR_OK;
 408                         break;
 409                 }
 410                 break;
 411         case SR_CONF_TIMEBASE:
 412                 g_variant_get(data, "(tt)", &p, &q);
 413
 414                 for (i = 0; i < model->num_timebases; i++) {
 415                         if (p != (*model->timebases)[i][0] ||
 416                             q != (*model->timebases)[i][1])
 417                                 continue;
 418                         state->timebase = i;
 419                         g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 420                         g_snprintf(command, sizeof(command),
 421                                    (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 422                                    float_str);
 423
 424                         ret = sr_scpi_send(sdi->conn, command);
 425                         update_sample_rate = TRUE;
 426                         break;
 427                 }
 428                 break;
 429         case SR_CONF_HORIZ_TRIGGERPOS:
 430                 tmp_d = g_variant_get_double(data);
 431
 432                 if (tmp_d < 0.0 || tmp_d > 1.0)
 433                         return SR_ERR;
 434
 435                 state->horiz_triggerpos = tmp_d;
 436                 tmp_d = -(tmp_d - 0.5) *
 437                         ((double) (*model->timebases)[state->timebase][0] /
 438                         (*model->timebases)[state->timebase][1])
 439                          * model->num_xdivs;
 440
 441                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 442                 g_snprintf(command, sizeof(command),
 443                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 444                            float_str);
 445
 446                 ret = sr_scpi_send(sdi->conn, command);
 447                 break;
 448         case SR_CONF_TRIGGER_SLOPE:
 449                 tmp = g_variant_get_string(data, NULL);
 450
 451                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 452                         return SR_ERR_ARG;
 453
 454                 state->trigger_slope = (tmp[0] == 'r') ? 0 : 1;
 455
 456                 g_snprintf(command, sizeof(command),
 457                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 458                            (state->trigger_slope == 0) ? "POS" : "NEG");
 459
 460                 ret = sr_scpi_send(sdi->conn, command);
 461                 break;
 462         case SR_CONF_COUPLING:
 463                 if (cg_type == CG_NONE) {
 464                         sr_err("No channel group specified.");
 465                         return SR_ERR_CHANNEL_GROUP;
 466                 }
 467
 468                 tmp = g_variant_get_string(data, NULL);
 469
 470                 for (i = 0; (*model->coupling_options)[i]; i++) {
 471                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 472                                 continue;
 473                         for (j = 1; j <= model->analog_channels; ++j) {
 474                                 if (cg != &devc->analog_groups[j - 1])
 475                                         continue;
 476                                 state->analog_channels[j-1].coupling = i;
 477
 478                                 g_snprintf(command, sizeof(command),
 479                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 480                                            j, tmp);
 481
 482                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 483                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 484                                         return SR_ERR;
 485                                 break;
 486                         }
 487
 488                         ret = SR_OK;
 489                         break;
 490                 }
 491                 break;
 492         default:
 493                 ret = SR_ERR_NA;
 494                 break;
 495         }
 496
 497         if (ret == SR_OK)
 498                 ret = sr_scpi_get_opc(sdi->conn);
 499
 500         if (ret == SR_OK && update_sample_rate)
 501                 ret = hmo_update_sample_rate(sdi);
 502
 503         return ret;
 504 }
 505
 506 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 507                        const struct sr_channel_group *cg)
 508 {
 509         int cg_type;
 510         struct dev_context *devc;
 511         struct scope_config *model;
 512
 513         if (!sdi || !(devc = sdi->priv))
 514                 return SR_ERR_ARG;
 515
 516         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 517                 return SR_ERR;
 518
 519         model = devc->model_config;
 520
 521         switch (key) {
 522         case SR_CONF_DEVICE_OPTIONS:
 523                 if (cg_type == CG_NONE) {
 524                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 525                                 model->hw_caps, model->num_hwcaps,
 526                                 sizeof(int32_t));
 527                 } else if (cg_type == CG_ANALOG) {
 528                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 529                                 model->analog_hwcaps, model->num_analog_hwcaps,
 530                                 sizeof(int32_t));
 531                 } else {
 532                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 533                                 NULL, 0, sizeof(int32_t));
 534                 }
 535                 break;
 536         case SR_CONF_COUPLING:
 537                 if (cg_type == CG_NONE)
 538                         return SR_ERR_CHANNEL_GROUP;
 539                 *data = g_variant_new_strv(*model->coupling_options,
 540                            g_strv_length((char **)*model->coupling_options));
 541                 break;
 542         case SR_CONF_TRIGGER_SOURCE:
 543                 *data = g_variant_new_strv(*model->trigger_sources,
 544                            g_strv_length((char **)*model->trigger_sources));
 545                 break;
 546         case SR_CONF_TRIGGER_SLOPE:
 547                 *data = g_variant_new_strv(*model->trigger_slopes,
 548                            g_strv_length((char **)*model->trigger_slopes));
 549                 break;
 550         case SR_CONF_TIMEBASE:
 551                 *data = build_tuples(model->timebases, model->num_timebases);
 552                 break;
 553         case SR_CONF_VDIV:
 554                 if (cg_type == CG_NONE)
 555                         return SR_ERR_CHANNEL_GROUP;
 556                 *data = build_tuples(model->vdivs, model->num_vdivs);
 557                 break;
 558         default:
 559                 return SR_ERR_NA;
 560         }
 561
 562         return SR_OK;
 563 }
 564
 565 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 566 {
 567         char command[MAX_COMMAND_SIZE];
 568         struct sr_channel *ch;
 569         struct dev_context *devc;
 570         struct scope_config *model;
 571
 572         devc = sdi->priv;
 573         model = devc->model_config;
 574
 575         ch = devc->current_channel->data;
 576
 577         switch (ch->type) {
 578         case SR_CHANNEL_ANALOG:
 579                 g_snprintf(command, sizeof(command),
 580                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 581                            ch->index + 1);
 582                 break;
 583         case SR_CHANNEL_LOGIC:
 584                 g_snprintf(command, sizeof(command),
 585                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 586                            ch->index < 8 ? 1 : 2);
 587                 break;
 588         default:
 589                 sr_err("Invalid channel type.");
 590                 break;
 591         }
 592
 593         return sr_scpi_send(sdi->conn, command);
 594 }
 595
 596 static int hmo_check_channels(GSList *channels)
 597 {
 598         GSList *l;
 599         struct sr_channel *ch;
 600         gboolean enabled_pod1, enabled_pod2, enabled_chan3, enabled_chan4;
 601
 602         enabled_pod1 = enabled_pod2 = enabled_chan3 = enabled_chan4 = FALSE;
 603
 604         for (l = channels; l; l = l->next) {
 605                 ch = l->data;
 606                 switch (ch->type) {
 607                 case SR_CHANNEL_ANALOG:
 608                         if (ch->index == 2)
 609                                 enabled_chan3 = TRUE;
 610                         else if (ch->index == 3)
 611                                 enabled_chan4 = TRUE;
 612                         break;
 613                 case SR_CHANNEL_LOGIC:
 614                         if (ch->index < 8)
 615                                 enabled_pod1 = TRUE;
 616                         else
 617                                 enabled_pod2 = TRUE;
 618                         break;
 619                 default:
 620                         return SR_ERR;
 621                 }
 622         }
 623
 624         if ((enabled_pod1 && enabled_chan3) ||
 625             (enabled_pod2 && enabled_chan4))
 626                 return SR_ERR;
 627
 628         return SR_OK;
 629 }
 630
 631 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 632 {
 633         GSList *l;
 634         unsigned int i;
 635         gboolean *pod_enabled, setup_changed;
 636         char command[MAX_COMMAND_SIZE];
 637         struct scope_state *state;
 638         struct scope_config *model;
 639         struct sr_channel *ch;
 640         struct dev_context *devc;
 641         struct sr_scpi_dev_inst *scpi;
 642
 643         devc = sdi->priv;
 644         scpi = sdi->conn;
 645         state = devc->model_state;
 646         model = devc->model_config;
 647         setup_changed = FALSE;
 648
 649         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 650
 651         for (l = sdi->channels; l; l = l->next) {
 652                 ch = l->data;
 653                 switch (ch->type) {
 654                 case SR_CHANNEL_ANALOG:
 655                         if (ch->enabled == state->analog_channels[ch->index].state)
 656                                 break;
 657                         g_snprintf(command, sizeof(command),
 658                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 659                                    ch->index + 1, ch->enabled);
 660
 661                         if (sr_scpi_send(scpi, command) != SR_OK)
 662                                 return SR_ERR;
 663                         state->analog_channels[ch->index].state = ch->enabled;
 664                         setup_changed = TRUE;
 665                         break;
 666                 case SR_CHANNEL_LOGIC:
 667                         /*
 668                          * A digital POD needs to be enabled for every group of
 669                          * 8 channels.
 670                          */
 671                         if (ch->enabled)
 672                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 673
 674                         if (ch->enabled == state->digital_channels[ch->index])
 675                                 break;
 676                         g_snprintf(command, sizeof(command),
 677                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 678                                    ch->index, ch->enabled);
 679
 680                         if (sr_scpi_send(scpi, command) != SR_OK)
 681                                 return SR_ERR;
 682
 683                         state->digital_channels[ch->index] = ch->enabled;
 684                         setup_changed = TRUE;
 685                         break;
 686                 default:
 687                         return SR_ERR;
 688                 }
 689         }
 690
 691         for (i = 1; i <= model->digital_pods; ++i) {
 692                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 693                         continue;
 694                 g_snprintf(command, sizeof(command),
 695                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 696                            i, pod_enabled[i - 1]);
 697                 if (sr_scpi_send(scpi, command) != SR_OK)
 698                         return SR_ERR;
 699                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 700                 setup_changed = TRUE;
 701         }
 702
 703         g_free(pod_enabled);
 704
 705         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 706                 return SR_ERR;
 707
 708         return SR_OK;
 709 }
 710
 711 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 712 {
 713         GSList *l;
 714         gboolean digital_added;
 715         struct sr_channel *ch;
 716         struct dev_context *devc;
 717         struct sr_scpi_dev_inst *scpi;
 718
 719         if (sdi->status != SR_ST_ACTIVE)
 720                 return SR_ERR_DEV_CLOSED;
 721
 722         scpi = sdi->conn;
 723         devc = sdi->priv;
 724         digital_added = FALSE;
 725
 726         for (l = sdi->channels; l; l = l->next) {
 727                 ch = l->data;
 728                 if (!ch->enabled)
 729                         continue;
 730                 /* Only add a single digital channel. */
 731                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 732                         devc->enabled_channels = g_slist_append(
 733                                         devc->enabled_channels, ch);
 734                         if (ch->type == SR_CHANNEL_LOGIC)
 735                                 digital_added = TRUE;
 736                 }
 737         }
 738
 739         if (!devc->enabled_channels)
 740                 return SR_ERR;
 741
 742         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 743                 sr_err("Invalid channel configuration specified!");
 744                 return SR_ERR_NA;
 745         }
 746
 747         if (hmo_setup_channels(sdi) != SR_OK) {
 748                 sr_err("Failed to setup channel configuration!");
 749                 return SR_ERR;
 750         }
 751
 752         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 753                         hmo_receive_data, (void *)sdi);
 754
 755         /* Send header packet to the session bus. */
 756         std_session_send_df_header(cb_data, LOG_PREFIX);
 757
 758         devc->current_channel = devc->enabled_channels;
 759
 760         return hmo_request_data(sdi);
 761 }
 762
 763 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 764 {
 765         struct dev_context *devc;
 766         struct sr_scpi_dev_inst *scpi;
 767         struct sr_datafeed_packet packet;
 768
 769         (void)cb_data;
 770
 771         packet.type = SR_DF_END;
 772         packet.payload = NULL;
 773         sr_session_send(sdi, &packet);
 774
 775         if (sdi->status != SR_ST_ACTIVE)
 776                 return SR_ERR_DEV_CLOSED;
 777
 778         devc = sdi->priv;
 779
 780         devc->num_frames = 0;
 781         g_slist_free(devc->enabled_channels);
 782         devc->enabled_channels = NULL;
 783         scpi = sdi->conn;
 784         sr_scpi_source_remove(sdi->session, scpi);
 785
 786         return SR_OK;
 787 }
 788
 789 SR_PRIV struct sr_dev_driver hameg_hmo_driver_info = {
 790         .name = "hameg-hmo",
 791         .longname = "Hameg HMO",
 792         .api_version = 1,
 793         .init = init,
 794         .cleanup = cleanup,
 795         .scan = scan,
 796         .dev_list = dev_list,
 797         .dev_clear = dev_clear,
 798         .config_get = config_get,
 799         .config_set = config_set,
 800         .config_list = config_list,
 801         .dev_open = dev_open,
 802         .dev_close = dev_close,
 803         .dev_acquisition_start = dev_acquisition_start,
 804         .dev_acquisition_stop = dev_acquisition_stop,
 805         .priv = NULL,
 806 };