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         if (hw_info)
 102                 sr_scpi_hw_info_free(hw_info);
 103         sr_dev_inst_free(sdi);
 104         g_free(devc);
 105
 106         return NULL;
 107 }
 108
 109 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 110 {
 111         return sr_scpi_scan(di->context, options, hmo_probe_serial_device);
 112 }
 113
 114 static void clear_helper(void *priv)
 115 {
 116         struct dev_context *devc;
 117
 118         devc = priv;
 119
 120         hmo_scope_state_free(devc->model_state);
 121
 122         g_free(devc->analog_groups);
 123         g_free(devc->digital_groups);
 124
 125         g_free(devc);
 126 }
 127
 128 static int dev_clear(const struct sr_dev_driver *di)
 129 {
 130         return std_dev_clear(di, clear_helper);
 131 }
 132
 133 static int dev_open(struct sr_dev_inst *sdi)
 134 {
 135         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 136                 return SR_ERR;
 137
 138         if (hmo_scope_state_get(sdi) != SR_OK)
 139                 return SR_ERR;
 140
 141         sdi->status = SR_ST_ACTIVE;
 142
 143         return SR_OK;
 144 }
 145
 146 static int dev_close(struct sr_dev_inst *sdi)
 147 {
 148         if (sdi->status == SR_ST_INACTIVE)
 149                 return SR_OK;
 150
 151         sr_scpi_close(sdi->conn);
 152
 153         sdi->status = SR_ST_INACTIVE;
 154
 155         return SR_OK;
 156 }
 157
 158 static int check_channel_group(struct dev_context *devc,
 159                              const struct sr_channel_group *cg)
 160 {
 161         unsigned int i;
 162         const struct scope_config *model;
 163
 164         model = devc->model_config;
 165
 166         if (!cg)
 167                 return CG_NONE;
 168
 169         for (i = 0; i < model->analog_channels; i++)
 170                 if (cg == devc->analog_groups[i])
 171                         return CG_ANALOG;
 172
 173         for (i = 0; i < model->digital_pods; i++)
 174                 if (cg == devc->digital_groups[i])
 175                         return CG_DIGITAL;
 176
 177         sr_err("Invalid channel group specified.");
 178
 179         return CG_INVALID;
 180 }
 181
 182 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 183                       const struct sr_channel_group *cg)
 184 {
 185         int ret, cg_type;
 186         unsigned int i;
 187         struct dev_context *devc;
 188         const struct scope_config *model;
 189         struct scope_state *state;
 190
 191         if (!sdi)
 192                 return SR_ERR_ARG;
 193
 194         devc = sdi->priv;
 195
 196         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 197                 return SR_ERR;
 198
 199         ret = SR_ERR_NA;
 200         model = devc->model_config;
 201         state = devc->model_state;
 202
 203         switch (key) {
 204         case SR_CONF_NUM_HDIV:
 205                 *data = g_variant_new_int32(model->num_xdivs);
 206                 ret = SR_OK;
 207                 break;
 208         case SR_CONF_TIMEBASE:
 209                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 210                                       (*model->timebases)[state->timebase][1]);
 211                 ret = SR_OK;
 212                 break;
 213         case SR_CONF_NUM_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_int32(model->num_ydivs);
 222                                 ret = SR_OK;
 223                                 break;
 224                         }
 225
 226                 } else {
 227                         ret = SR_ERR_NA;
 228                 }
 229                 break;
 230         case SR_CONF_VDIV:
 231                 if (cg_type == CG_NONE) {
 232                         sr_err("No channel group specified.");
 233                         return SR_ERR_CHANNEL_GROUP;
 234                 } else if (cg_type == CG_ANALOG) {
 235                         for (i = 0; i < model->analog_channels; i++) {
 236                                 if (cg != devc->analog_groups[i])
 237                                         continue;
 238                                 *data = g_variant_new("(tt)",
 239                                                       (*model->vdivs)[state->analog_channels[i].vdiv][0],
 240                                                       (*model->vdivs)[state->analog_channels[i].vdiv][1]);
 241                                 ret = SR_OK;
 242                                 break;
 243                         }
 244
 245                 } else {
 246                         ret = SR_ERR_NA;
 247                 }
 248                 break;
 249         case SR_CONF_TRIGGER_SOURCE:
 250                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 251                 ret = SR_OK;
 252                 break;
 253         case SR_CONF_TRIGGER_SLOPE:
 254                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 255                 ret = SR_OK;
 256                 break;
 257         case SR_CONF_HORIZ_TRIGGERPOS:
 258                 *data = g_variant_new_double(state->horiz_triggerpos);
 259                 ret = SR_OK;
 260                 break;
 261         case SR_CONF_COUPLING:
 262                 if (cg_type == CG_NONE) {
 263                         sr_err("No channel group specified.");
 264                         return SR_ERR_CHANNEL_GROUP;
 265                 } else if (cg_type == CG_ANALOG) {
 266                         for (i = 0; i < model->analog_channels; i++) {
 267                                 if (cg != devc->analog_groups[i])
 268                                         continue;
 269                                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[i].coupling]);
 270                                 ret = SR_OK;
 271                                 break;
 272                         }
 273
 274                 } else {
 275                         ret = SR_ERR_NA;
 276                 }
 277                 break;
 278         case SR_CONF_SAMPLERATE:
 279                 *data = g_variant_new_uint64(state->sample_rate);
 280                 ret = SR_OK;
 281                 break;
 282         default:
 283                 ret = SR_ERR_NA;
 284         }
 285
 286         return ret;
 287 }
 288
 289 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 290 {
 291         unsigned int i;
 292         GVariant *rational[2];
 293         GVariantBuilder gvb;
 294
 295         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 296
 297         for (i = 0; i < n; i++) {
 298                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 299                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 300
 301                 /* FIXME: Valgrind reports a memory leak here. */
 302                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 303         }
 304
 305         return g_variant_builder_end(&gvb);
 306 }
 307
 308 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 309                       const struct sr_channel_group *cg)
 310 {
 311         int ret, cg_type;
 312         unsigned int i, j;
 313         char command[MAX_COMMAND_SIZE], float_str[30];
 314         struct dev_context *devc;
 315         const struct scope_config *model;
 316         struct scope_state *state;
 317         const char *tmp;
 318         uint64_t p, q;
 319         double tmp_d;
 320         gboolean update_sample_rate;
 321
 322         if (!sdi)
 323                 return SR_ERR_ARG;
 324
 325         devc = sdi->priv;
 326
 327         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 328                 return SR_ERR;
 329
 330         model = devc->model_config;
 331         state = devc->model_state;
 332         update_sample_rate = FALSE;
 333
 334         ret = SR_ERR_NA;
 335
 336         switch (key) {
 337         case SR_CONF_LIMIT_FRAMES:
 338                 devc->frame_limit = g_variant_get_uint64(data);
 339                 ret = SR_OK;
 340                 break;
 341         case SR_CONF_TRIGGER_SOURCE:
 342                 tmp = g_variant_get_string(data, NULL);
 343                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 344                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 345                                 continue;
 346                         state->trigger_source = i;
 347                         g_snprintf(command, sizeof(command),
 348                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 349                                    (*model->trigger_sources)[i]);
 350
 351                         ret = sr_scpi_send(sdi->conn, command);
 352                         break;
 353                 }
 354                 break;
 355         case SR_CONF_VDIV:
 356                 if (cg_type == CG_NONE) {
 357                         sr_err("No channel group specified.");
 358                         return SR_ERR_CHANNEL_GROUP;
 359                 }
 360
 361                 g_variant_get(data, "(tt)", &p, &q);
 362
 363                 for (i = 0; i < model->num_vdivs; i++) {
 364                         if (p != (*model->vdivs)[i][0] ||
 365                             q != (*model->vdivs)[i][1])
 366                                 continue;
 367                         for (j = 1; j <= model->analog_channels; j++) {
 368                                 if (cg != devc->analog_groups[j - 1])
 369                                         continue;
 370                                 state->analog_channels[j - 1].vdiv = i;
 371                                 g_ascii_formatd(float_str, sizeof(float_str), "%E", (float) p / q);
 372                                 g_snprintf(command, sizeof(command),
 373                                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 374                                            j, float_str);
 375
 376                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 377                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 378                                         return SR_ERR;
 379
 380                                 break;
 381                         }
 382
 383                         ret = SR_OK;
 384                         break;
 385                 }
 386                 break;
 387         case SR_CONF_TIMEBASE:
 388                 g_variant_get(data, "(tt)", &p, &q);
 389
 390                 for (i = 0; i < model->num_timebases; i++) {
 391                         if (p != (*model->timebases)[i][0] ||
 392                             q != (*model->timebases)[i][1])
 393                                 continue;
 394                         state->timebase = 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_TIMEBASE],
 398                                    float_str);
 399
 400                         ret = sr_scpi_send(sdi->conn, command);
 401                         update_sample_rate = TRUE;
 402                         break;
 403                 }
 404                 break;
 405         case SR_CONF_HORIZ_TRIGGERPOS:
 406                 tmp_d = g_variant_get_double(data);
 407
 408                 if (tmp_d < 0.0 || tmp_d > 1.0)
 409                         return SR_ERR;
 410
 411                 state->horiz_triggerpos = tmp_d;
 412                 tmp_d = -(tmp_d - 0.5) *
 413                         ((double) (*model->timebases)[state->timebase][0] /
 414                         (*model->timebases)[state->timebase][1])
 415                          * model->num_xdivs;
 416
 417                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 418                 g_snprintf(command, sizeof(command),
 419                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 420                            float_str);
 421
 422                 ret = sr_scpi_send(sdi->conn, command);
 423                 break;
 424         case SR_CONF_TRIGGER_SLOPE:
 425                 tmp = g_variant_get_string(data, NULL);
 426                 for (i = 0; (*model->trigger_slopes)[i]; i++) {
 427                         if (g_strcmp0(tmp, (*model->trigger_slopes)[i]) != 0)
 428                                 continue;
 429                         state->trigger_slope = i;
 430                         g_snprintf(command, sizeof(command),
 431                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 432                                    (*model->trigger_slopes)[i]);
 433
 434                         ret = sr_scpi_send(sdi->conn, command);
 435                         break;
 436                 }
 437                 break;
 438         case SR_CONF_COUPLING:
 439                 if (cg_type == CG_NONE) {
 440                         sr_err("No channel group specified.");
 441                         return SR_ERR_CHANNEL_GROUP;
 442                 }
 443
 444                 tmp = g_variant_get_string(data, NULL);
 445
 446                 for (i = 0; (*model->coupling_options)[i]; i++) {
 447                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 448                                 continue;
 449                         for (j = 1; j <= model->analog_channels; j++) {
 450                                 if (cg != devc->analog_groups[j - 1])
 451                                         continue;
 452                                 state->analog_channels[j-1].coupling = i;
 453
 454                                 g_snprintf(command, sizeof(command),
 455                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 456                                            j, tmp);
 457
 458                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 459                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 460                                         return SR_ERR;
 461                                 break;
 462                         }
 463
 464                         ret = SR_OK;
 465                         break;
 466                 }
 467                 break;
 468         default:
 469                 ret = SR_ERR_NA;
 470                 break;
 471         }
 472
 473         if (ret == SR_OK)
 474                 ret = sr_scpi_get_opc(sdi->conn);
 475
 476         if (ret == SR_OK && update_sample_rate)
 477                 ret = hmo_update_sample_rate(sdi);
 478
 479         return ret;
 480 }
 481
 482 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 483                        const struct sr_channel_group *cg)
 484 {
 485         int cg_type = CG_NONE;
 486         struct dev_context *devc = NULL;
 487         const struct scope_config *model = NULL;
 488
 489         if (sdi) {
 490                 devc = sdi->priv;
 491                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 492                         return SR_ERR;
 493
 494                 model = devc->model_config;
 495         }
 496
 497         switch (key) {
 498         case SR_CONF_SCAN_OPTIONS:
 499                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 500                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 501                 break;
 502         case SR_CONF_DEVICE_OPTIONS:
 503                 if (cg_type == CG_NONE) {
 504                         if (model)
 505                                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 506                                         model->devopts, model->num_devopts, sizeof(uint32_t));
 507                         else
 508                                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 509                                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 510                 } else if (cg_type == CG_ANALOG) {
 511                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 512                                 model->analog_devopts, model->num_analog_devopts,
 513                                 sizeof(uint32_t));
 514                 } else {
 515                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 516                                 NULL, 0, sizeof(uint32_t));
 517                 }
 518                 break;
 519         case SR_CONF_COUPLING:
 520                 if (cg_type == CG_NONE)
 521                         return SR_ERR_CHANNEL_GROUP;
 522                 *data = g_variant_new_strv(*model->coupling_options,
 523                            g_strv_length((char **)*model->coupling_options));
 524                 break;
 525         case SR_CONF_TRIGGER_SOURCE:
 526                 if (!model)
 527                         return SR_ERR_ARG;
 528                 *data = g_variant_new_strv(*model->trigger_sources,
 529                            g_strv_length((char **)*model->trigger_sources));
 530                 break;
 531         case SR_CONF_TRIGGER_SLOPE:
 532                 if (!model)
 533                         return SR_ERR_ARG;
 534                 *data = g_variant_new_strv(*model->trigger_slopes,
 535                            g_strv_length((char **)*model->trigger_slopes));
 536                 break;
 537         case SR_CONF_TIMEBASE:
 538                 if (!model)
 539                         return SR_ERR_ARG;
 540                 *data = build_tuples(model->timebases, model->num_timebases);
 541                 break;
 542         case SR_CONF_VDIV:
 543                 if (cg_type == CG_NONE)
 544                         return SR_ERR_CHANNEL_GROUP;
 545                 *data = build_tuples(model->vdivs, model->num_vdivs);
 546                 break;
 547         default:
 548                 return SR_ERR_NA;
 549         }
 550
 551         return SR_OK;
 552 }
 553
 554 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 555 {
 556         char command[MAX_COMMAND_SIZE];
 557         struct sr_channel *ch;
 558         struct dev_context *devc;
 559         const struct scope_config *model;
 560
 561         devc = sdi->priv;
 562         model = devc->model_config;
 563
 564         ch = devc->current_channel->data;
 565
 566         switch (ch->type) {
 567         case SR_CHANNEL_ANALOG:
 568                 g_snprintf(command, sizeof(command),
 569                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 570 #ifdef WORDS_BIGENDIAN
 571                            "MSBF",
 572 #else
 573                            "LSBF",
 574 #endif
 575                            ch->index + 1);
 576                 break;
 577         case SR_CHANNEL_LOGIC:
 578                 g_snprintf(command, sizeof(command),
 579                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 580                            ch->index < 8 ? 1 : 2);
 581                 break;
 582         default:
 583                 sr_err("Invalid channel type.");
 584                 break;
 585         }
 586
 587         return sr_scpi_send(sdi->conn, command);
 588 }
 589
 590 static int hmo_check_channels(GSList *channels)
 591 {
 592         GSList *l;
 593         struct sr_channel *ch;
 594         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 595         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 596         size_t idx;
 597
 598         /* Preset "not enabled" for all channels / pods. */
 599         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 600                 enabled_chan[idx] = FALSE;
 601         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 602                 enabled_pod[idx] = FALSE;
 603
 604         /*
 605          * Determine which channels / pods are required for the caller's
 606          * specified configuration.
 607          */
 608         for (l = channels; l; l = l->next) {
 609                 ch = l->data;
 610                 switch (ch->type) {
 611                 case SR_CHANNEL_ANALOG:
 612                         idx = ch->index;
 613                         if (idx < ARRAY_SIZE(enabled_chan))
 614                                 enabled_chan[idx] = TRUE;
 615                         break;
 616                 case SR_CHANNEL_LOGIC:
 617                         idx = ch->index / 8;
 618                         if (idx < ARRAY_SIZE(enabled_pod))
 619                                 enabled_pod[idx] = TRUE;
 620                         break;
 621                 default:
 622                         return SR_ERR;
 623                 }
 624         }
 625
 626         /*
 627          * Check for resource conflicts. Some channels can be either
 628          * analog or digital, but never both at the same time.
 629          *
 630          * Note that the constraints might depend on the specific model.
 631          * These tests might need some adjustment when support for more
 632          * models gets added to the driver.
 633          */
 634         if (enabled_pod[0] && enabled_chan[2])
 635                 return SR_ERR;
 636         if (enabled_pod[1] && enabled_chan[3])
 637                 return SR_ERR;
 638         return SR_OK;
 639 }
 640
 641 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 642 {
 643         GSList *l;
 644         unsigned int i;
 645         gboolean *pod_enabled, setup_changed;
 646         char command[MAX_COMMAND_SIZE];
 647         struct scope_state *state;
 648         const struct scope_config *model;
 649         struct sr_channel *ch;
 650         struct dev_context *devc;
 651         struct sr_scpi_dev_inst *scpi;
 652
 653         devc = sdi->priv;
 654         scpi = sdi->conn;
 655         state = devc->model_state;
 656         model = devc->model_config;
 657         setup_changed = FALSE;
 658
 659         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 660
 661         for (l = sdi->channels; l; l = l->next) {
 662                 ch = l->data;
 663                 switch (ch->type) {
 664                 case SR_CHANNEL_ANALOG:
 665                         if (ch->enabled == state->analog_channels[ch->index].state)
 666                                 break;
 667                         g_snprintf(command, sizeof(command),
 668                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 669                                    ch->index + 1, ch->enabled);
 670
 671                         if (sr_scpi_send(scpi, command) != SR_OK)
 672                                 return SR_ERR;
 673                         state->analog_channels[ch->index].state = ch->enabled;
 674                         setup_changed = TRUE;
 675                         break;
 676                 case SR_CHANNEL_LOGIC:
 677                         /*
 678                          * A digital POD needs to be enabled for every group of
 679                          * 8 channels.
 680                          */
 681                         if (ch->enabled)
 682                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 683
 684                         if (ch->enabled == state->digital_channels[ch->index])
 685                                 break;
 686                         g_snprintf(command, sizeof(command),
 687                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 688                                    ch->index, ch->enabled);
 689
 690                         if (sr_scpi_send(scpi, command) != SR_OK)
 691                                 return SR_ERR;
 692
 693                         state->digital_channels[ch->index] = ch->enabled;
 694                         setup_changed = TRUE;
 695                         break;
 696                 default:
 697                         return SR_ERR;
 698                 }
 699         }
 700
 701         for (i = 1; i <= model->digital_pods; i++) {
 702                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 703                         continue;
 704                 g_snprintf(command, sizeof(command),
 705                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 706                            i, pod_enabled[i - 1]);
 707                 if (sr_scpi_send(scpi, command) != SR_OK)
 708                         return SR_ERR;
 709                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 710                 setup_changed = TRUE;
 711         }
 712
 713         g_free(pod_enabled);
 714
 715         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 716                 return SR_ERR;
 717
 718         return SR_OK;
 719 }
 720
 721 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 722 {
 723         GSList *l;
 724         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 725         size_t group, pod_count;
 726         struct sr_channel *ch;
 727         struct dev_context *devc;
 728         struct sr_scpi_dev_inst *scpi;
 729         int ret;
 730
 731         if (sdi->status != SR_ST_ACTIVE)
 732                 return SR_ERR_DEV_CLOSED;
 733
 734         scpi = sdi->conn;
 735         devc = sdi->priv;
 736
 737         /* Preset empty results. */
 738         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 739                 digital_added[group] = FALSE;
 740         g_slist_free(devc->enabled_channels);
 741         devc->enabled_channels = NULL;
 742
 743         /*
 744          * Contruct the list of enabled channels. Determine the highest
 745          * number of digital pods involved in the acquisition.
 746          */
 747         pod_count = 0;
 748         for (l = sdi->channels; l; l = l->next) {
 749                 ch = l->data;
 750                 if (!ch->enabled)
 751                         continue;
 752                 /* Only add a single digital channel per group (pod). */
 753                 group = ch->index / 8;
 754                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 755                         devc->enabled_channels = g_slist_append(
 756                                         devc->enabled_channels, ch);
 757                         if (ch->type == SR_CHANNEL_LOGIC) {
 758                                 digital_added[group] = TRUE;
 759                                 if (pod_count < group + 1)
 760                                         pod_count = group + 1;
 761                         }
 762                 }
 763         }
 764         if (!devc->enabled_channels)
 765                 return SR_ERR;
 766         devc->pod_count = pod_count;
 767         devc->logic_data = NULL;
 768
 769         /*
 770          * Check constraints. Some channels can be either analog or
 771          * digital, but not both at the same time.
 772          */
 773         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 774                 sr_err("Invalid channel configuration specified!");
 775                 ret = SR_ERR_NA;
 776                 goto free_enabled;
 777         }
 778
 779         /*
 780          * Configure the analog and digital channels and the
 781          * corresponding digital pods.
 782          */
 783         if (hmo_setup_channels(sdi) != SR_OK) {
 784                 sr_err("Failed to setup channel configuration!");
 785                 ret = SR_ERR;
 786                 goto free_enabled;
 787         }
 788
 789         /*
 790          * Start acquisition on the first enabled channel. The
 791          * receive routine will continue driving the acquisition.
 792          */
 793         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 794                         hmo_receive_data, (void *)sdi);
 795
 796         std_session_send_df_header(sdi);
 797
 798         devc->current_channel = devc->enabled_channels;
 799
 800         return hmo_request_data(sdi);
 801
 802 free_enabled:
 803         g_slist_free(devc->enabled_channels);
 804         devc->enabled_channels = NULL;
 805         return ret;
 806 }
 807
 808 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 809 {
 810         struct dev_context *devc;
 811         struct sr_scpi_dev_inst *scpi;
 812
 813         std_session_send_df_end(sdi);
 814
 815         if (sdi->status != SR_ST_ACTIVE)
 816                 return SR_ERR_DEV_CLOSED;
 817
 818         devc = sdi->priv;
 819
 820         devc->num_frames = 0;
 821         g_slist_free(devc->enabled_channels);
 822         devc->enabled_channels = NULL;
 823         scpi = sdi->conn;
 824         sr_scpi_source_remove(sdi->session, scpi);
 825
 826         return SR_OK;
 827 }
 828
 829 static struct sr_dev_driver hameg_hmo_driver_info = {
 830         .name = "hameg-hmo",
 831         .longname = "Hameg HMO",
 832         .api_version = 1,
 833         .init = std_init,
 834         .cleanup = std_cleanup,
 835         .scan = scan,
 836         .dev_list = std_dev_list,
 837         .dev_clear = dev_clear,
 838         .config_get = config_get,
 839         .config_set = config_set,
 840         .config_list = config_list,
 841         .dev_open = dev_open,
 842         .dev_close = dev_close,
 843         .dev_acquisition_start = dev_acquisition_start,
 844         .dev_acquisition_stop = dev_acquisition_stop,
 845         .context = NULL,
 846 };
 847 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);