src/hardware/hameg-hmo/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdlib.h>
  22 #include "scpi.h"
  23 #include "protocol.h"
  24
  25 #define SERIALCOMM "115200/8n1/flow=1"
  26
  27 static struct sr_dev_driver hameg_hmo_driver_info;
  28
  29 static const char *manufacturers[] = {
  30         "HAMEG",
  31         "Rohde&Schwarz",
  32 };
  33
  34 static const uint32_t scanopts[] = {
  35         SR_CONF_CONN,
  36         SR_CONF_SERIALCOMM,
  37 };
  38
  39 static const uint32_t drvopts[] = {
  40         SR_CONF_OSCILLOSCOPE,
  41 };
  42
  43 enum {
  44         CG_INVALID = -1,
  45         CG_NONE,
  46         CG_ANALOG,
  47         CG_DIGITAL,
  48 };
  49
  50 static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
  51 {
  52         struct sr_dev_inst *sdi;
  53         struct dev_context *devc;
  54         struct sr_scpi_hw_info *hw_info;
  55
  56         sdi = NULL;
  57         devc = NULL;
  58         hw_info = NULL;
  59
  60         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  61                 sr_info("Couldn't get IDN response.");
  62                 goto fail;
  63         }
  64
  65         if (std_str_idx_s(hw_info->manufacturer, ARRAY_AND_SIZE(manufacturers)) < 0)
  66                 goto fail;
  67
  68         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  69         sdi->vendor = g_strdup(hw_info->manufacturer);
  70         sdi->model = g_strdup(hw_info->model);
  71         sdi->version = g_strdup(hw_info->firmware_version);
  72         sdi->serial_num = g_strdup(hw_info->serial_number);
  73         sdi->driver = &hameg_hmo_driver_info;
  74         sdi->inst_type = SR_INST_SCPI;
  75         sdi->conn = scpi;
  76
  77         sr_scpi_hw_info_free(hw_info);
  78         hw_info = NULL;
  79
  80         devc = g_malloc0(sizeof(struct dev_context));
  81
  82         sdi->priv = devc;
  83
  84         if (hmo_init_device(sdi) != SR_OK)
  85                 goto fail;
  86
  87         return sdi;
  88
  89 fail:
  90         sr_scpi_hw_info_free(hw_info);
  91         sr_dev_inst_free(sdi);
  92         g_free(devc);
  93
  94         return NULL;
  95 }
  96
  97 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  98 {
  99         return sr_scpi_scan(di->context, options, probe_device);
 100 }
 101
 102 static void clear_helper(struct dev_context *devc)
 103 {
 104         hmo_scope_state_free(devc->model_state);
 105         g_free(devc->analog_groups);
 106         g_free(devc->digital_groups);
 107 }
 108
 109 static int dev_clear(const struct sr_dev_driver *di)
 110 {
 111         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 112 }
 113
 114 static int dev_open(struct sr_dev_inst *sdi)
 115 {
 116         if (sr_scpi_open(sdi->conn) != SR_OK)
 117                 return SR_ERR;
 118
 119         if (hmo_scope_state_get(sdi) != SR_OK)
 120                 return SR_ERR;
 121
 122         return SR_OK;
 123 }
 124
 125 static int dev_close(struct sr_dev_inst *sdi)
 126 {
 127         return sr_scpi_close(sdi->conn);
 128 }
 129
 130 static int check_channel_group(struct dev_context *devc,
 131                              const struct sr_channel_group *cg)
 132 {
 133         unsigned int i;
 134         const struct scope_config *model;
 135
 136         model = devc->model_config;
 137
 138         if (!cg)
 139                 return CG_NONE;
 140
 141         for (i = 0; i < model->analog_channels; i++)
 142                 if (cg == devc->analog_groups[i])
 143                         return CG_ANALOG;
 144
 145         for (i = 0; i < model->digital_pods; i++)
 146                 if (cg == devc->digital_groups[i])
 147                         return CG_DIGITAL;
 148
 149         sr_err("Invalid channel group specified.");
 150
 151         return CG_INVALID;
 152 }
 153
 154 static int config_get(uint32_t key, GVariant **data,
 155         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 156 {
 157         int cg_type;
 158         unsigned int i;
 159         struct dev_context *devc;
 160         const struct scope_config *model;
 161         struct scope_state *state;
 162
 163         if (!sdi)
 164                 return SR_ERR_ARG;
 165
 166         devc = sdi->priv;
 167
 168         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 169                 return SR_ERR;
 170
 171         model = devc->model_config;
 172         state = devc->model_state;
 173
 174         switch (key) {
 175         case SR_CONF_NUM_HDIV:
 176                 *data = g_variant_new_int32(model->num_xdivs);
 177                 break;
 178         case SR_CONF_TIMEBASE:
 179                 *data = g_variant_new("(tt)", (*model->timebases)[state->timebase][0],
 180                                       (*model->timebases)[state->timebase][1]);
 181                 break;
 182         case SR_CONF_NUM_VDIV:
 183                 if (cg_type == CG_NONE) {
 184                         return SR_ERR_CHANNEL_GROUP;
 185                 } else if (cg_type == CG_ANALOG) {
 186                         for (i = 0; i < model->analog_channels; i++) {
 187                                 if (cg != devc->analog_groups[i])
 188                                         continue;
 189                                 *data = g_variant_new_int32(model->num_ydivs);
 190                                 break;
 191                         }
 192                 } else {
 193                         return SR_ERR_NA;
 194                 }
 195                 break;
 196         case SR_CONF_VDIV:
 197                 if (cg_type == CG_NONE) {
 198                         return SR_ERR_CHANNEL_GROUP;
 199                 } else if (cg_type == CG_ANALOG) {
 200                         for (i = 0; i < model->analog_channels; i++) {
 201                                 if (cg != devc->analog_groups[i])
 202                                         continue;
 203                                 *data = g_variant_new("(tt)",
 204                                                       (*model->vdivs)[state->analog_channels[i].vdiv][0],
 205                                                       (*model->vdivs)[state->analog_channels[i].vdiv][1]);
 206                                 break;
 207                         }
 208                 } else {
 209                         return SR_ERR_NA;
 210                 }
 211                 break;
 212         case SR_CONF_TRIGGER_SOURCE:
 213                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 214                 break;
 215         case SR_CONF_TRIGGER_SLOPE:
 216                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 217                 break;
 218         case SR_CONF_HORIZ_TRIGGERPOS:
 219                 *data = g_variant_new_double(state->horiz_triggerpos);
 220                 break;
 221         case SR_CONF_COUPLING:
 222                 if (cg_type == CG_NONE) {
 223                         return SR_ERR_CHANNEL_GROUP;
 224                 } else if (cg_type == CG_ANALOG) {
 225                         for (i = 0; i < model->analog_channels; i++) {
 226                                 if (cg != devc->analog_groups[i])
 227                                         continue;
 228                                 *data = g_variant_new_string((*model->coupling_options)[state->analog_channels[i].coupling]);
 229                                 break;
 230                         }
 231                 } else {
 232                         return SR_ERR_NA;
 233                 }
 234                 break;
 235         case SR_CONF_SAMPLERATE:
 236                 *data = g_variant_new_uint64(state->sample_rate);
 237                 break;
 238         default:
 239                 return SR_ERR_NA;
 240         }
 241
 242         return SR_OK;
 243 }
 244
 245 static int config_set(uint32_t key, GVariant *data,
 246         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 247 {
 248         int ret, cg_type, idx;
 249         unsigned int i, j;
 250         char command[MAX_COMMAND_SIZE], float_str[30];
 251         struct dev_context *devc;
 252         const struct scope_config *model;
 253         struct scope_state *state;
 254         const char *tmp;
 255         double tmp_d;
 256         gboolean update_sample_rate;
 257
 258         if (!sdi)
 259                 return SR_ERR_ARG;
 260
 261         devc = sdi->priv;
 262
 263         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 264                 return SR_ERR;
 265
 266         model = devc->model_config;
 267         state = devc->model_state;
 268         update_sample_rate = FALSE;
 269
 270         ret = SR_ERR_NA;
 271
 272         switch (key) {
 273         case SR_CONF_LIMIT_FRAMES:
 274                 devc->frame_limit = g_variant_get_uint64(data);
 275                 ret = SR_OK;
 276                 break;
 277         case SR_CONF_TRIGGER_SOURCE:
 278                 tmp = g_variant_get_string(data, NULL);
 279                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 280                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 281                                 continue;
 282                         state->trigger_source = i;
 283                         g_snprintf(command, sizeof(command),
 284                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 285                                    (*model->trigger_sources)[i]);
 286
 287                         ret = sr_scpi_send(sdi->conn, command);
 288                         break;
 289                 }
 290                 break;
 291         case SR_CONF_VDIV:
 292                 if (cg_type == CG_NONE)
 293                         return SR_ERR_CHANNEL_GROUP;
 294                 if ((idx = std_u64_tuple_idx(data, *model->vdivs, model->num_vdivs)) < 0)
 295                         return SR_ERR_ARG;
 296                 for (j = 1; j <= model->analog_channels; j++) {
 297                         if (cg != devc->analog_groups[j - 1])
 298                                 continue;
 299                         state->analog_channels[j - 1].vdiv = idx;
 300                         g_ascii_formatd(float_str, sizeof(float_str), "%E",
 301                                 (float) (*model->vdivs)[idx][0] / (*model->vdivs)[idx][1]);
 302                         g_snprintf(command, sizeof(command),
 303                                    (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 304                                    j, float_str);
 305                         if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 306                             sr_scpi_get_opc(sdi->conn) != SR_OK)
 307                                 return SR_ERR;
 308                         break;
 309                 }
 310                 ret = SR_OK;
 311                 break;
 312         case SR_CONF_TIMEBASE:
 313                 if ((idx = std_u64_tuple_idx(data, *model->timebases, model->num_timebases)) < 0)
 314                         return SR_ERR_ARG;
 315                 state->timebase = idx;
 316                 g_ascii_formatd(float_str, sizeof(float_str), "%E",
 317                         (float) (*model->timebases)[idx][0] / (*model->timebases)[idx][1]);
 318                 g_snprintf(command, sizeof(command),
 319                            (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 320                            float_str);
 321                 ret = sr_scpi_send(sdi->conn, command);
 322                 update_sample_rate = TRUE;
 323                 break;
 324         case SR_CONF_HORIZ_TRIGGERPOS:
 325                 tmp_d = g_variant_get_double(data);
 326
 327                 if (tmp_d < 0.0 || tmp_d > 1.0)
 328                         return SR_ERR;
 329
 330                 state->horiz_triggerpos = tmp_d;
 331                 tmp_d = -(tmp_d - 0.5) *
 332                         ((double) (*model->timebases)[state->timebase][0] /
 333                         (*model->timebases)[state->timebase][1])
 334                          * model->num_xdivs;
 335
 336                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 337                 g_snprintf(command, sizeof(command),
 338                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 339                            float_str);
 340
 341                 ret = sr_scpi_send(sdi->conn, command);
 342                 break;
 343         case SR_CONF_TRIGGER_SLOPE:
 344                 tmp = g_variant_get_string(data, NULL);
 345                 for (i = 0; (*model->trigger_slopes)[i]; i++) {
 346                         if (g_strcmp0(tmp, (*model->trigger_slopes)[i]) != 0)
 347                                 continue;
 348                         state->trigger_slope = i;
 349                         g_snprintf(command, sizeof(command),
 350                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 351                                    (*model->trigger_slopes)[i]);
 352
 353                         ret = sr_scpi_send(sdi->conn, command);
 354                         break;
 355                 }
 356                 break;
 357         case SR_CONF_COUPLING:
 358                 if (cg_type == CG_NONE)
 359                         return SR_ERR_CHANNEL_GROUP;
 360
 361                 tmp = g_variant_get_string(data, NULL);
 362
 363                 for (i = 0; (*model->coupling_options)[i]; i++) {
 364                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 365                                 continue;
 366                         for (j = 1; j <= model->analog_channels; j++) {
 367                                 if (cg != devc->analog_groups[j - 1])
 368                                         continue;
 369                                 state->analog_channels[j-1].coupling = i;
 370
 371                                 g_snprintf(command, sizeof(command),
 372                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 373                                            j, tmp);
 374
 375                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 376                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 377                                         return SR_ERR;
 378                                 break;
 379                         }
 380
 381                         ret = SR_OK;
 382                         break;
 383                 }
 384                 break;
 385         default:
 386                 ret = SR_ERR_NA;
 387                 break;
 388         }
 389
 390         if (ret == SR_OK)
 391                 ret = sr_scpi_get_opc(sdi->conn);
 392
 393         if (ret == SR_OK && update_sample_rate)
 394                 ret = hmo_update_sample_rate(sdi);
 395
 396         return ret;
 397 }
 398
 399 static int config_list(uint32_t key, GVariant **data,
 400         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 401 {
 402         int cg_type = CG_NONE;
 403         struct dev_context *devc = NULL;
 404         const struct scope_config *model = NULL;
 405
 406         if (sdi) {
 407                 devc = sdi->priv;
 408                 if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 409                         return SR_ERR;
 410
 411                 model = devc->model_config;
 412         }
 413
 414         switch (key) {
 415         case SR_CONF_SCAN_OPTIONS:
 416                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(scanopts));
 417                 break;
 418         case SR_CONF_DEVICE_OPTIONS:
 419                 if (cg_type == CG_NONE) {
 420                         if (model)
 421                                 *data = std_gvar_array_u32((const uint32_t *)model->devopts, model->num_devopts);
 422                         else
 423                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(drvopts));
 424                 } else if (cg_type == CG_ANALOG) {
 425                         *data = std_gvar_array_u32((const uint32_t *)model->devopts_cg_analog, model->num_devopts_cg_analog);
 426                 } else {
 427                         *data = std_gvar_array_u32(NULL, 0);
 428                 }
 429                 break;
 430         case SR_CONF_COUPLING:
 431                 if (cg_type == CG_NONE)
 432                         return SR_ERR_CHANNEL_GROUP;
 433                 *data = g_variant_new_strv(*model->coupling_options,
 434                            g_strv_length((char **)*model->coupling_options));
 435                 break;
 436         case SR_CONF_TRIGGER_SOURCE:
 437                 if (!model)
 438                         return SR_ERR_ARG;
 439                 *data = g_variant_new_strv(*model->trigger_sources,
 440                            g_strv_length((char **)*model->trigger_sources));
 441                 break;
 442         case SR_CONF_TRIGGER_SLOPE:
 443                 if (!model)
 444                         return SR_ERR_ARG;
 445                 *data = g_variant_new_strv(*model->trigger_slopes,
 446                            g_strv_length((char **)*model->trigger_slopes));
 447                 break;
 448         case SR_CONF_TIMEBASE:
 449                 if (!model)
 450                         return SR_ERR_ARG;
 451                 *data = std_gvar_tuple_array(*model->timebases, model->num_timebases);
 452                 break;
 453         case SR_CONF_VDIV:
 454                 if (cg_type == CG_NONE)
 455                         return SR_ERR_CHANNEL_GROUP;
 456                 *data = std_gvar_tuple_array(*model->vdivs, model->num_vdivs);
 457                 break;
 458         default:
 459                 return SR_ERR_NA;
 460         }
 461
 462         return SR_OK;
 463 }
 464
 465 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 466 {
 467         char command[MAX_COMMAND_SIZE];
 468         struct sr_channel *ch;
 469         struct dev_context *devc;
 470         const struct scope_config *model;
 471
 472         devc = sdi->priv;
 473         model = devc->model_config;
 474
 475         ch = devc->current_channel->data;
 476
 477         switch (ch->type) {
 478         case SR_CHANNEL_ANALOG:
 479                 g_snprintf(command, sizeof(command),
 480                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 481 #ifdef WORDS_BIGENDIAN
 482                            "MSBF",
 483 #else
 484                            "LSBF",
 485 #endif
 486                            ch->index + 1);
 487                 break;
 488         case SR_CHANNEL_LOGIC:
 489                 g_snprintf(command, sizeof(command),
 490                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 491                            ch->index < 8 ? 1 : 2);
 492                 break;
 493         default:
 494                 sr_err("Invalid channel type.");
 495                 break;
 496         }
 497
 498         return sr_scpi_send(sdi->conn, command);
 499 }
 500
 501 static int hmo_check_channels(GSList *channels)
 502 {
 503         GSList *l;
 504         struct sr_channel *ch;
 505         gboolean enabled_chan[MAX_ANALOG_CHANNEL_COUNT];
 506         gboolean enabled_pod[MAX_DIGITAL_GROUP_COUNT];
 507         size_t idx;
 508
 509         /* Preset "not enabled" for all channels / pods. */
 510         for (idx = 0; idx < ARRAY_SIZE(enabled_chan); idx++)
 511                 enabled_chan[idx] = FALSE;
 512         for (idx = 0; idx < ARRAY_SIZE(enabled_pod); idx++)
 513                 enabled_pod[idx] = FALSE;
 514
 515         /*
 516          * Determine which channels / pods are required for the caller's
 517          * specified configuration.
 518          */
 519         for (l = channels; l; l = l->next) {
 520                 ch = l->data;
 521                 switch (ch->type) {
 522                 case SR_CHANNEL_ANALOG:
 523                         idx = ch->index;
 524                         if (idx < ARRAY_SIZE(enabled_chan))
 525                                 enabled_chan[idx] = TRUE;
 526                         break;
 527                 case SR_CHANNEL_LOGIC:
 528                         idx = ch->index / 8;
 529                         if (idx < ARRAY_SIZE(enabled_pod))
 530                                 enabled_pod[idx] = TRUE;
 531                         break;
 532                 default:
 533                         return SR_ERR;
 534                 }
 535         }
 536
 537         /*
 538          * Check for resource conflicts. Some channels can be either
 539          * analog or digital, but never both at the same time.
 540          *
 541          * Note that the constraints might depend on the specific model.
 542          * These tests might need some adjustment when support for more
 543          * models gets added to the driver.
 544          */
 545         if (enabled_pod[0] && enabled_chan[2])
 546                 return SR_ERR;
 547         if (enabled_pod[1] && enabled_chan[3])
 548                 return SR_ERR;
 549         return SR_OK;
 550 }
 551
 552 static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 553 {
 554         GSList *l;
 555         unsigned int i;
 556         gboolean *pod_enabled, setup_changed;
 557         char command[MAX_COMMAND_SIZE];
 558         struct scope_state *state;
 559         const struct scope_config *model;
 560         struct sr_channel *ch;
 561         struct dev_context *devc;
 562         struct sr_scpi_dev_inst *scpi;
 563
 564         devc = sdi->priv;
 565         scpi = sdi->conn;
 566         state = devc->model_state;
 567         model = devc->model_config;
 568         setup_changed = FALSE;
 569
 570         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 571
 572         for (l = sdi->channels; l; l = l->next) {
 573                 ch = l->data;
 574                 switch (ch->type) {
 575                 case SR_CHANNEL_ANALOG:
 576                         if (ch->enabled == state->analog_channels[ch->index].state)
 577                                 break;
 578                         g_snprintf(command, sizeof(command),
 579                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 580                                    ch->index + 1, ch->enabled);
 581
 582                         if (sr_scpi_send(scpi, command) != SR_OK)
 583                                 return SR_ERR;
 584                         state->analog_channels[ch->index].state = ch->enabled;
 585                         setup_changed = TRUE;
 586                         break;
 587                 case SR_CHANNEL_LOGIC:
 588                         /*
 589                          * A digital POD needs to be enabled for every group of
 590                          * 8 channels.
 591                          */
 592                         if (ch->enabled)
 593                                 pod_enabled[ch->index < 8 ? 0 : 1] = TRUE;
 594
 595                         if (ch->enabled == state->digital_channels[ch->index])
 596                                 break;
 597                         g_snprintf(command, sizeof(command),
 598                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 599                                    ch->index, ch->enabled);
 600
 601                         if (sr_scpi_send(scpi, command) != SR_OK)
 602                                 return SR_ERR;
 603
 604                         state->digital_channels[ch->index] = ch->enabled;
 605                         setup_changed = TRUE;
 606                         break;
 607                 default:
 608                         return SR_ERR;
 609                 }
 610         }
 611
 612         for (i = 1; i <= model->digital_pods; i++) {
 613                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 614                         continue;
 615                 g_snprintf(command, sizeof(command),
 616                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 617                            i, pod_enabled[i - 1]);
 618                 if (sr_scpi_send(scpi, command) != SR_OK)
 619                         return SR_ERR;
 620                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 621                 setup_changed = TRUE;
 622         }
 623
 624         g_free(pod_enabled);
 625
 626         if (setup_changed && hmo_update_sample_rate(sdi) != SR_OK)
 627                 return SR_ERR;
 628
 629         return SR_OK;
 630 }
 631
 632 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 633 {
 634         GSList *l;
 635         gboolean digital_added[MAX_DIGITAL_GROUP_COUNT];
 636         size_t group, pod_count;
 637         struct sr_channel *ch;
 638         struct dev_context *devc;
 639         struct sr_scpi_dev_inst *scpi;
 640         int ret;
 641
 642         scpi = sdi->conn;
 643         devc = sdi->priv;
 644
 645         /* Preset empty results. */
 646         for (group = 0; group < ARRAY_SIZE(digital_added); group++)
 647                 digital_added[group] = FALSE;
 648         g_slist_free(devc->enabled_channels);
 649         devc->enabled_channels = NULL;
 650
 651         /*
 652          * Contruct the list of enabled channels. Determine the highest
 653          * number of digital pods involved in the acquisition.
 654          */
 655         pod_count = 0;
 656         for (l = sdi->channels; l; l = l->next) {
 657                 ch = l->data;
 658                 if (!ch->enabled)
 659                         continue;
 660                 /* Only add a single digital channel per group (pod). */
 661                 group = ch->index / 8;
 662                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added[group]) {
 663                         devc->enabled_channels = g_slist_append(
 664                                         devc->enabled_channels, ch);
 665                         if (ch->type == SR_CHANNEL_LOGIC) {
 666                                 digital_added[group] = TRUE;
 667                                 if (pod_count < group + 1)
 668                                         pod_count = group + 1;
 669                         }
 670                 }
 671         }
 672         if (!devc->enabled_channels)
 673                 return SR_ERR;
 674         devc->pod_count = pod_count;
 675         devc->logic_data = NULL;
 676
 677         /*
 678          * Check constraints. Some channels can be either analog or
 679          * digital, but not both at the same time.
 680          */
 681         if (hmo_check_channels(devc->enabled_channels) != SR_OK) {
 682                 sr_err("Invalid channel configuration specified!");
 683                 ret = SR_ERR_NA;
 684                 goto free_enabled;
 685         }
 686
 687         /*
 688          * Configure the analog and digital channels and the
 689          * corresponding digital pods.
 690          */
 691         if (hmo_setup_channels(sdi) != SR_OK) {
 692                 sr_err("Failed to setup channel configuration!");
 693                 ret = SR_ERR;
 694                 goto free_enabled;
 695         }
 696
 697         /*
 698          * Start acquisition on the first enabled channel. The
 699          * receive routine will continue driving the acquisition.
 700          */
 701         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 50,
 702                         hmo_receive_data, (void *)sdi);
 703
 704         std_session_send_df_header(sdi);
 705
 706         devc->current_channel = devc->enabled_channels;
 707
 708         return hmo_request_data(sdi);
 709
 710 free_enabled:
 711         g_slist_free(devc->enabled_channels);
 712         devc->enabled_channels = NULL;
 713         return ret;
 714 }
 715
 716 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 717 {
 718         struct dev_context *devc;
 719         struct sr_scpi_dev_inst *scpi;
 720
 721         std_session_send_df_end(sdi);
 722
 723         devc = sdi->priv;
 724
 725         devc->num_frames = 0;
 726         g_slist_free(devc->enabled_channels);
 727         devc->enabled_channels = NULL;
 728         scpi = sdi->conn;
 729         sr_scpi_source_remove(sdi->session, scpi);
 730
 731         return SR_OK;
 732 }
 733
 734 static struct sr_dev_driver hameg_hmo_driver_info = {
 735         .name = "hameg-hmo",
 736         .longname = "Hameg HMO",
 737         .api_version = 1,
 738         .init = std_init,
 739         .cleanup = std_cleanup,
 740         .scan = scan,
 741         .dev_list = std_dev_list,
 742         .dev_clear = dev_clear,
 743         .config_get = config_get,
 744         .config_set = config_set,
 745         .config_list = config_list,
 746         .dev_open = dev_open,
 747         .dev_close = dev_close,
 748         .dev_acquisition_start = dev_acquisition_start,
 749         .dev_acquisition_stop = dev_acquisition_stop,
 750         .context = NULL,
 751 };
 752 SR_REGISTER_DEV_DRIVER(hameg_hmo_driver_info);