src/hardware/yokogawa-dlm/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 abraxa (Soeren Apel) <soeren@apelpie.net>
   5  * Based on the Hameg HMO driver by poljar (Damir Jelić) <poljarinho@gmail.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdlib.h>
  22 #include "protocol.h"
  23
  24 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info;
  25 static struct sr_dev_driver *di = &yokogawa_dlm_driver_info;
  26
  27 static char *MANUFACTURER_ID = "YOKOGAWA";
  28 static char *MANUFACTURER_NAME = "Yokogawa";
  29
  30 enum {
  31         CG_INVALID = -1,
  32         CG_NONE,
  33         CG_ANALOG,
  34         CG_DIGITAL,
  35 };
  36
  37 static int init(struct sr_context *sr_ctx)
  38 {
  39         return std_init(sr_ctx, di, LOG_PREFIX);
  40 }
  41
  42 static struct sr_dev_inst *probe_usbtmc_device(struct sr_scpi_dev_inst *scpi)
  43 {
  44         struct sr_dev_inst *sdi;
  45         struct dev_context *devc;
  46         struct sr_scpi_hw_info *hw_info;
  47         char *model_name;
  48         int model_index;
  49
  50         sdi = NULL;
  51         devc = NULL;
  52         hw_info = NULL;
  53
  54         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  55                 sr_info("Couldn't get IDN response.");
  56                 goto fail;
  57         }
  58
  59         if (strcmp(hw_info->manufacturer, MANUFACTURER_ID) != 0)
  60                 goto fail;
  61
  62         if (dlm_model_get(hw_info->model, &model_name, &model_index) != SR_OK)
  63                 goto fail;
  64
  65         sdi = sr_dev_inst_new();
  66         sdi->status = SR_ST_ACTIVE;
  67         sdi->vendor = g_strdup(MANUFACTURER_NAME);
  68         sdi->model = g_strdup(model_name);
  69         sdi->version = g_strdup(hw_info->firmware_version);
  70
  71         sdi->serial_num = g_strdup(hw_info->serial_number);
  72
  73         sr_scpi_hw_info_free(hw_info);
  74         hw_info = NULL;
  75
  76         devc = g_malloc0(sizeof(struct dev_context));
  77
  78         sdi->driver = di;
  79         sdi->priv = devc;
  80         sdi->inst_type = SR_INST_SCPI;
  81         sdi->conn = scpi;
  82
  83         if (dlm_device_init(sdi, model_index) != SR_OK)
  84                 goto fail;
  85
  86         sr_scpi_close(sdi->conn);
  87
  88         sdi->status = SR_ST_INACTIVE;
  89         return sdi;
  90
  91 fail:
  92         if (hw_info)
  93                 sr_scpi_hw_info_free(hw_info);
  94         if (sdi)
  95                 sr_dev_inst_free(sdi);
  96         if (devc)
  97                 g_free(devc);
  98
  99         return NULL;
 100 }
 101
 102 static GSList *scan(GSList *options)
 103 {
 104         return sr_scpi_scan(di->priv, options, probe_usbtmc_device);
 105 }
 106
 107 static GSList *dev_list(void)
 108 {
 109         return ((struct drv_context *)(di->priv))->instances;
 110 }
 111
 112 static void clear_helper(void *priv)
 113 {
 114         struct dev_context *devc;
 115
 116         devc = priv;
 117
 118         dlm_scope_state_destroy(devc->model_state);
 119
 120         g_free(devc->analog_groups);
 121         g_free(devc->digital_groups);
 122         g_free(devc);
 123 }
 124
 125 static int dev_clear(void)
 126 {
 127         return std_dev_clear(di, clear_helper);
 128 }
 129
 130 static int dev_open(struct sr_dev_inst *sdi)
 131 {
 132         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 133                 return SR_ERR;
 134
 135         if (dlm_scope_state_query(sdi) != SR_OK)
 136                 return SR_ERR;
 137
 138         sdi->status = SR_ST_ACTIVE;
 139
 140         return SR_OK;
 141 }
 142
 143 static int dev_close(struct sr_dev_inst *sdi)
 144 {
 145         if (sdi->status == SR_ST_INACTIVE)
 146                 return SR_OK;
 147
 148         sr_scpi_close(sdi->conn);
 149
 150         sdi->status = SR_ST_INACTIVE;
 151
 152         return SR_OK;
 153 }
 154
 155 static int cleanup(void)
 156 {
 157         dev_clear();
 158
 159         return SR_OK;
 160 }
 161
 162 /**
 163  * Check which category a given channel group belongs to.
 164  *
 165  * @param devc Our internal device context.
 166  * @param cg   The channel group to check.
 167  *
 168  * @retval CG_NONE    cg is NULL
 169  * @retval CG_ANALOG  cg is an analog group
 170  * @retval CG_DIGITAL cg is a digital group
 171  * @retval CG_INVALID cg is something else
 172  */
 173 static int check_channel_group(struct dev_context *devc,
 174                         const struct sr_channel_group *cg)
 175 {
 176         unsigned int i;
 177         struct scope_config *model;
 178
 179         model = devc->model_config;
 180
 181         if (!cg)
 182                 return CG_NONE;
 183
 184         for (i = 0; i < model->analog_channels; ++i)
 185                 if (cg == devc->analog_groups[i])
 186                         return CG_ANALOG;
 187
 188         for (i = 0; i < model->pods; ++i)
 189                 if (cg == devc->digital_groups[i])
 190                         return CG_DIGITAL;
 191
 192         sr_err("Invalid channel group specified.");
 193         return CG_INVALID;
 194 }
 195
 196 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 197                 const struct sr_channel_group *cg)
 198 {
 199         int ret, cg_type;
 200         unsigned int i;
 201         struct dev_context *devc;
 202         struct scope_config *model;
 203         struct scope_state *state;
 204
 205         if (!sdi || !(devc = sdi->priv))
 206                 return SR_ERR_ARG;
 207
 208         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 209                 return SR_ERR;
 210
 211         ret = SR_ERR_NA;
 212         model = devc->model_config;
 213         state = devc->model_state;
 214
 215         switch (key) {
 216         case SR_CONF_NUM_TIMEBASE:
 217                 *data = g_variant_new_int32(model->num_xdivs);
 218                 ret = SR_OK;
 219                 break;
 220         case SR_CONF_TIMEBASE:
 221                 *data = g_variant_new("(tt)",
 222                                 (*model->timebases)[state->timebase][0],
 223                                 (*model->timebases)[state->timebase][1]);
 224                 ret = SR_OK;
 225                 break;
 226         case SR_CONF_NUM_VDIV:
 227                 if (cg_type == CG_NONE) {
 228                         sr_err("No channel group specified.");
 229                         return SR_ERR_CHANNEL_GROUP;
 230                 } else if (cg_type == CG_ANALOG) {
 231                                 *data = g_variant_new_int32(model->num_ydivs);
 232                                 ret = SR_OK;
 233                                 break;
 234                 } else {
 235                         ret = SR_ERR_NA;
 236                 }
 237                 break;
 238         case SR_CONF_VDIV:
 239                 ret = SR_ERR_NA;
 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                         break;
 245
 246                 for (i = 0; i < model->analog_channels; ++i) {
 247                         if (cg != devc->analog_groups[i])
 248                                 continue;
 249                         *data = g_variant_new("(tt)",
 250                                         (*model->vdivs)[state->analog_states[i].vdiv][0],
 251                                         (*model->vdivs)[state->analog_states[i].vdiv][1]);
 252                         ret = SR_OK;
 253                         break;
 254                 }
 255                 break;
 256         case SR_CONF_TRIGGER_SOURCE:
 257                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 258                 ret = SR_OK;
 259                 break;
 260         case SR_CONF_TRIGGER_SLOPE:
 261                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 262                 ret = SR_OK;
 263                 break;
 264         case SR_CONF_HORIZ_TRIGGERPOS:
 265                 *data = g_variant_new_double(state->horiz_triggerpos);
 266                 ret = SR_OK;
 267                 break;
 268         case SR_CONF_COUPLING:
 269                 ret = SR_ERR_NA;
 270                 if (cg_type == CG_NONE) {
 271                         sr_err("No channel group specified.");
 272                         return SR_ERR_CHANNEL_GROUP;
 273                 } else if (cg_type != CG_ANALOG)
 274                         break;
 275
 276                 for (i = 0; i < model->analog_channels; ++i) {
 277                         if (cg != devc->analog_groups[i])
 278                                 continue;
 279                         *data = g_variant_new_string((*model->coupling_options)[state->analog_states[i].coupling]);
 280                         ret = SR_OK;
 281                         break;
 282                 }
 283                 break;
 284         case SR_CONF_SAMPLERATE:
 285                 *data = g_variant_new_uint64(state->sample_rate);
 286                 ret = SR_OK;
 287                 break;
 288         default:
 289                 ret = SR_ERR_NA;
 290         }
 291
 292         return ret;
 293 }
 294
 295 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 296 {
 297         unsigned int i;
 298         GVariant *rational[2];
 299         GVariantBuilder gvb;
 300
 301         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 302
 303         for (i = 0; i < n; i++) {
 304                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 305                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 306
 307                 /* FIXME: Valgrind reports a memory leak here. */
 308                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 309         }
 310
 311         return g_variant_builder_end(&gvb);
 312 }
 313
 314 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 315                 const struct sr_channel_group *cg)
 316 {
 317         int ret, cg_type;
 318         unsigned int i, j;
 319         char float_str[30];
 320         struct dev_context *devc;
 321         struct scope_config *model;
 322         struct scope_state *state;
 323         const char *tmp;
 324         uint64_t p, q;
 325         double tmp_d;
 326         gboolean update_sample_rate;
 327
 328         if (!sdi || !(devc = sdi->priv))
 329                 return SR_ERR_ARG;
 330
 331         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 332                 return SR_ERR;
 333
 334         model = devc->model_config;
 335         state = devc->model_state;
 336         update_sample_rate = FALSE;
 337
 338         ret = SR_ERR_NA;
 339
 340         switch (key) {
 341         case SR_CONF_LIMIT_FRAMES:
 342                 devc->frame_limit = g_variant_get_uint64(data);
 343                 ret = SR_OK;
 344                 break;
 345         case SR_CONF_TRIGGER_SOURCE:
 346                 tmp = g_variant_get_string(data, NULL);
 347                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 348                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 349                                 continue;
 350                         state->trigger_source = i;
 351                         /* TODO: A and B trigger support possible? */
 352                         ret = dlm_trigger_source_set(sdi->conn, (*model->trigger_sources)[i]);
 353                         break;
 354                 }
 355                 break;
 356         case SR_CONF_VDIV:
 357                 if (cg_type == CG_NONE) {
 358                         sr_err("No channel group specified.");
 359                         return SR_ERR_CHANNEL_GROUP;
 360                 }
 361
 362                 g_variant_get(data, "(tt)", &p, &q);
 363
 364                 for (i = 0; i < model->num_vdivs; i++) {
 365                         if (p != (*model->vdivs)[i][0] ||
 366                                         q != (*model->vdivs)[i][1])
 367                                 continue;
 368                         for (j = 1; j <= model->analog_channels; ++j) {
 369                                 if (cg != devc->analog_groups[j - 1])
 370                                         continue;
 371                                 state->analog_states[j - 1].vdiv = i;
 372                                 g_ascii_formatd(float_str, sizeof(float_str),
 373                                                 "%E", (float) p / q);
 374                                 if (dlm_analog_chan_vdiv_set(sdi->conn, j, float_str) != SR_OK ||
 375                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 376                                         return SR_ERR;
 377
 378                                 break;
 379                         }
 380
 381                         ret = SR_OK;
 382                         break;
 383                 }
 384                 break;
 385         case SR_CONF_TIMEBASE:
 386                 g_variant_get(data, "(tt)", &p, &q);
 387
 388                 for (i = 0; i < model->num_timebases; i++) {
 389                         if (p != (*model->timebases)[i][0] ||
 390                                         q != (*model->timebases)[i][1])
 391                                 continue;
 392                         state->timebase = i;
 393                         g_ascii_formatd(float_str, sizeof(float_str),
 394                                         "%E", (float) p / q);
 395                         ret = dlm_timebase_set(sdi->conn, float_str);
 396                         update_sample_rate = TRUE;
 397                         break;
 398                 }
 399                 break;
 400         case SR_CONF_HORIZ_TRIGGERPOS:
 401                 tmp_d = g_variant_get_double(data);
 402
 403                 /* TODO: Check if the calculation makes sense for the DLM. */
 404                 if (tmp_d < 0.0 || tmp_d > 1.0)
 405                         return SR_ERR;
 406
 407                 state->horiz_triggerpos = tmp_d;
 408                 tmp_d = -(tmp_d - 0.5) *
 409                                 ((double) (*model->timebases)[state->timebase][0] /
 410                                 (*model->timebases)[state->timebase][1])
 411                                 * model->num_xdivs;
 412
 413                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 414                 ret = dlm_horiz_trigger_pos_set(sdi->conn, float_str);
 415                 break;
 416         case SR_CONF_TRIGGER_SLOPE:
 417                 tmp = g_variant_get_string(data, NULL);
 418
 419                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 420                         return SR_ERR_ARG;
 421
 422                 /* Note: See dlm_trigger_slopes[] in protocol.c. */
 423                 state->trigger_slope = (tmp[0] == 'r') ?
 424                                 SLOPE_POSITIVE : SLOPE_NEGATIVE;
 425
 426                 ret = dlm_trigger_slope_set(sdi->conn, state->trigger_slope);
 427                 break;
 428         case SR_CONF_COUPLING:
 429                 if (cg_type == CG_NONE) {
 430                         sr_err("No channel group specified.");
 431                         return SR_ERR_CHANNEL_GROUP;
 432                 }
 433
 434                 tmp = g_variant_get_string(data, NULL);
 435
 436                 for (i = 0; (*model->coupling_options)[i]; i++) {
 437                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 438                                 continue;
 439                         for (j = 1; j <= model->analog_channels; ++j) {
 440                                 if (cg != devc->analog_groups[j - 1])
 441                                         continue;
 442                                 state->analog_states[j-1].coupling = i;
 443
 444                                 if (dlm_analog_chan_coupl_set(sdi->conn, j, tmp) != SR_OK ||
 445                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 446                                         return SR_ERR;
 447                                 break;
 448                         }
 449
 450                         ret = SR_OK;
 451                         break;
 452                 }
 453                 break;
 454         default:
 455                 ret = SR_ERR_NA;
 456                 break;
 457         }
 458
 459         if (ret == SR_OK)
 460                 ret = sr_scpi_get_opc(sdi->conn);
 461
 462         if (ret == SR_OK && update_sample_rate)
 463                 ret = dlm_sample_rate_query(sdi);
 464
 465         return ret;
 466 }
 467
 468 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 469                 const struct sr_channel_group *cg)
 470 {
 471         int cg_type;
 472         struct dev_context *devc;
 473         struct scope_config *model;
 474
 475         if (!sdi || !(devc = sdi->priv))
 476                 return SR_ERR_ARG;
 477
 478         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 479                 return SR_ERR;
 480
 481         model = devc->model_config;
 482
 483         switch (key) {
 484         case SR_CONF_DEVICE_OPTIONS:
 485                 if (cg_type == CG_NONE) {
 486                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 487                                 model->devopts, model->num_devopts, sizeof(uint32_t));
 488                 } else if (cg_type == CG_ANALOG) {
 489                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 490                                 model->analog_devopts, model->num_analog_devopts, sizeof(uint32_t));
 491                 } else {
 492                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 493                                 NULL, 0, sizeof(uint32_t));
 494                 }
 495                 break;
 496         case SR_CONF_COUPLING:
 497                 if (cg_type == CG_NONE)
 498                         return SR_ERR_CHANNEL_GROUP;
 499                 *data = g_variant_new_strv(*model->coupling_options,
 500                                 g_strv_length((char **)*model->coupling_options));
 501                 break;
 502         case SR_CONF_TRIGGER_SOURCE:
 503                 *data = g_variant_new_strv(*model->trigger_sources,
 504                                 g_strv_length((char **)*model->trigger_sources));
 505                 break;
 506         case SR_CONF_TRIGGER_SLOPE:
 507                 *data = g_variant_new_strv(*model->trigger_slopes,
 508                                 g_strv_length((char **)*model->trigger_slopes));
 509                 break;
 510         case SR_CONF_TIMEBASE:
 511                 *data = build_tuples(model->timebases, model->num_timebases);
 512                 break;
 513         case SR_CONF_VDIV:
 514                 if (cg_type == CG_NONE)
 515                         return SR_ERR_CHANNEL_GROUP;
 516                 *data = build_tuples(model->vdivs, model->num_vdivs);
 517                 break;
 518         default:
 519                 return SR_ERR_NA;
 520         }
 521
 522         return SR_OK;
 523 }
 524
 525 static int dlm_check_channels(GSList *channels)
 526 {
 527         GSList *l;
 528         struct sr_channel *ch;
 529         gboolean enabled_pod1, enabled_chan4;
 530
 531         enabled_pod1 = enabled_chan4 = FALSE;
 532
 533         /* Note: On the DLM2000, CH4 and Logic are shared. */
 534         /* TODO Handle non-DLM2000 models. */
 535         for (l = channels; l; l = l->next) {
 536                 ch = l->data;
 537                 switch (ch->type) {
 538                 case SR_CHANNEL_ANALOG:
 539                         if (ch->index == 3)
 540                                 enabled_chan4 = TRUE;
 541                         break;
 542                 case SR_CHANNEL_LOGIC:
 543                         enabled_pod1 = TRUE;
 544                         break;
 545                 default:
 546                         return SR_ERR;
 547                 }
 548         }
 549
 550         if (enabled_pod1 && enabled_chan4)
 551                 return SR_ERR;
 552
 553         return SR_OK;
 554 }
 555
 556 static int dlm_setup_channels(const struct sr_dev_inst *sdi)
 557 {
 558         GSList *l;
 559         unsigned int i;
 560         gboolean *pod_enabled, setup_changed;
 561         struct scope_state *state;
 562         struct scope_config *model;
 563         struct sr_channel *ch;
 564         struct dev_context *devc;
 565         struct sr_scpi_dev_inst *scpi;
 566
 567         devc = sdi->priv;
 568         scpi = sdi->conn;
 569         state = devc->model_state;
 570         model = devc->model_config;
 571         setup_changed = FALSE;
 572
 573         pod_enabled = g_malloc0(sizeof(gboolean) * model->pods);
 574
 575         for (l = sdi->channels; l; l = l->next) {
 576                 ch = l->data;
 577                 switch (ch->type) {
 578                 case SR_CHANNEL_ANALOG:
 579                         if (ch->enabled == state->analog_states[ch->index].state)
 580                                 break;
 581
 582                         if (dlm_analog_chan_state_set(scpi, ch->index + 1,
 583                                         ch->enabled) != SR_OK)
 584                                 return SR_ERR;
 585
 586                         state->analog_states[ch->index].state = ch->enabled;
 587                         setup_changed = TRUE;
 588                         break;
 589                 case SR_CHANNEL_LOGIC:
 590                         if (ch->enabled)
 591                                 pod_enabled[ch->index / 8] = TRUE;
 592
 593                         if (ch->enabled == state->digital_states[ch->index])
 594                                 break;
 595
 596                         if (dlm_digital_chan_state_set(scpi, ch->index + 1,
 597                                         ch->enabled) != SR_OK)
 598                                 return SR_ERR;
 599
 600                         state->digital_states[ch->index] = ch->enabled;
 601                         setup_changed = TRUE;
 602                         break;
 603                 default:
 604                         return SR_ERR;
 605                 }
 606         }
 607
 608         for (i = 1; i <= model->pods; ++i) {
 609                 if (state->pod_states[i - 1] == pod_enabled[i - 1])
 610                         continue;
 611
 612                 if (dlm_digital_pod_state_set(scpi, i,
 613                                 pod_enabled[i - 1]) != SR_OK)
 614                         return SR_ERR;
 615
 616                 state->pod_states[i - 1] = pod_enabled[i - 1];
 617                 setup_changed = TRUE;
 618         }
 619
 620         g_free(pod_enabled);
 621
 622         if (setup_changed && dlm_sample_rate_query(sdi) != SR_OK)
 623                 return SR_ERR;
 624
 625         return SR_OK;
 626 }
 627
 628 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 629 {
 630         GSList *l;
 631         gboolean digital_added;
 632         struct sr_channel *ch;
 633         struct dev_context *devc;
 634         struct sr_scpi_dev_inst *scpi;
 635
 636         (void)cb_data;
 637
 638         if (sdi->status != SR_ST_ACTIVE)
 639                 return SR_ERR_DEV_CLOSED;
 640
 641         scpi = sdi->conn;
 642         devc = sdi->priv;
 643         digital_added = FALSE;
 644
 645         g_slist_free(devc->enabled_channels);
 646         devc->enabled_channels = NULL;
 647
 648         for (l = sdi->channels; l; l = l->next) {
 649                 ch = l->data;
 650                 if (!ch->enabled)
 651                         continue;
 652                 /* Only add a single digital channel. */
 653                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 654                         devc->enabled_channels = g_slist_append(
 655                                 devc->enabled_channels, ch);
 656                         if (ch->type == SR_CHANNEL_LOGIC)
 657                                 digital_added = TRUE;
 658                 }
 659         }
 660
 661         if (!devc->enabled_channels)
 662                 return SR_ERR;
 663
 664         if (dlm_check_channels(devc->enabled_channels) != SR_OK) {
 665                 sr_err("Invalid channel configuration specified!");
 666                 return SR_ERR_NA;
 667         }
 668
 669         if (dlm_setup_channels(sdi) != SR_OK) {
 670                 sr_err("Failed to setup channel configuration!");
 671                 return SR_ERR;
 672         }
 673
 674         /* Request data for the first enabled channel. */
 675         devc->current_channel = devc->enabled_channels;
 676         dlm_channel_data_request(sdi);
 677
 678         /* Call our callback when data comes in or after 5ms. */
 679         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 5,
 680                         dlm_data_receive, (void *)sdi);
 681
 682         return SR_OK;
 683 }
 684
 685 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 686 {
 687         struct dev_context *devc;
 688         struct sr_datafeed_packet packet;
 689
 690         (void)cb_data;
 691
 692         packet.type = SR_DF_END;
 693         packet.payload = NULL;
 694         sr_session_send(sdi, &packet);
 695
 696         if (sdi->status != SR_ST_ACTIVE)
 697                 return SR_ERR_DEV_CLOSED;
 698
 699         devc = sdi->priv;
 700
 701         devc->num_frames = 0;
 702         g_slist_free(devc->enabled_channels);
 703         devc->enabled_channels = NULL;
 704
 705         sr_scpi_source_remove(sdi->session, sdi->conn);
 706
 707         return SR_OK;
 708 }
 709
 710 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info = {
 711         .name = "yokogawa-dlm",
 712         .longname = "Yokogawa DL/DLM",
 713         .api_version = 1,
 714         .init = init,
 715         .cleanup = cleanup,
 716         .scan = scan,
 717         .dev_list = dev_list,
 718         .dev_clear = dev_clear,
 719         .config_get = config_get,
 720         .config_set = config_set,
 721         .config_list = config_list,
 722         .dev_open = dev_open,
 723         .dev_close = dev_close,
 724         .dev_acquisition_start = dev_acquisition_start,
 725         .dev_acquisition_stop = dev_acquisition_stop,
 726         .priv = NULL,
 727 };