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         if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, MANUFACTURER_NAME,
  66                         model_name, NULL)))
  67                 goto fail;
  68
  69         sr_scpi_hw_info_free(hw_info);
  70         hw_info = NULL;
  71
  72         devc = g_malloc0(sizeof(struct dev_context));
  73
  74         sdi->driver = di;
  75         sdi->priv = devc;
  76         sdi->inst_type = SR_INST_SCPI;
  77         sdi->conn = scpi;
  78
  79         if (dlm_device_init(sdi, model_index) != SR_OK)
  80                 goto fail;
  81
  82         sr_scpi_close(sdi->conn);
  83
  84         sdi->status = SR_ST_INACTIVE;
  85         return sdi;
  86
  87 fail:
  88         if (hw_info)
  89                 sr_scpi_hw_info_free(hw_info);
  90         if (sdi)
  91                 sr_dev_inst_free(sdi);
  92         if (devc)
  93                 g_free(devc);
  94
  95         return NULL;
  96 }
  97
  98 static GSList *scan(GSList *options)
  99 {
 100         return sr_scpi_scan(di->priv, options, probe_usbtmc_device);
 101 }
 102
 103 static GSList *dev_list(void)
 104 {
 105         return ((struct drv_context *)(di->priv))->instances;
 106 }
 107
 108 static void clear_helper(void *priv)
 109 {
 110         struct dev_context *devc;
 111
 112         devc = priv;
 113
 114         dlm_scope_state_destroy(devc->model_state);
 115
 116         g_free(devc->analog_groups);
 117         g_free(devc->digital_groups);
 118         g_free(devc);
 119 }
 120
 121 static int dev_clear(void)
 122 {
 123         return std_dev_clear(di, clear_helper);
 124 }
 125
 126 static int dev_open(struct sr_dev_inst *sdi)
 127 {
 128         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 129                 return SR_ERR;
 130
 131         if (dlm_scope_state_query(sdi) != SR_OK)
 132                 return SR_ERR;
 133
 134         sdi->status = SR_ST_ACTIVE;
 135
 136         return SR_OK;
 137 }
 138
 139 static int dev_close(struct sr_dev_inst *sdi)
 140 {
 141         if (sdi->status == SR_ST_INACTIVE)
 142                 return SR_OK;
 143
 144         sr_scpi_close(sdi->conn);
 145
 146         sdi->status = SR_ST_INACTIVE;
 147
 148         return SR_OK;
 149 }
 150
 151 static int cleanup(void)
 152 {
 153         dev_clear();
 154
 155         return SR_OK;
 156 }
 157
 158 /**
 159  * Check which category a given channel group belongs to.
 160  *
 161  * @param devc Our internal device context.
 162  * @param cg   The channel group to check.
 163  *
 164  * @retval CG_NONE    cg is NULL
 165  * @retval CG_ANALOG  cg is an analog group
 166  * @retval CG_DIGITAL cg is a digital group
 167  * @retval CG_INVALID cg is something else
 168  */
 169 static int check_channel_group(struct dev_context *devc,
 170                         const struct sr_channel_group *cg)
 171 {
 172         unsigned int i;
 173         struct scope_config *model;
 174
 175         model = devc->model_config;
 176
 177         if (!cg)
 178                 return CG_NONE;
 179
 180         for (i = 0; i < model->analog_channels; ++i)
 181                 if (cg == devc->analog_groups[i])
 182                         return CG_ANALOG;
 183
 184         for (i = 0; i < model->pods; ++i)
 185                 if (cg == devc->digital_groups[i])
 186                         return CG_DIGITAL;
 187
 188         sr_err("Invalid channel group specified.");
 189         return CG_INVALID;
 190 }
 191
 192 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 193                 const struct sr_channel_group *cg)
 194 {
 195         int ret, cg_type;
 196         unsigned int i;
 197         struct dev_context *devc;
 198         struct scope_config *model;
 199         struct scope_state *state;
 200
 201         if (!sdi || !(devc = sdi->priv))
 202                 return SR_ERR_ARG;
 203
 204         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 205                 return SR_ERR;
 206
 207         ret = SR_ERR_NA;
 208         model = devc->model_config;
 209         state = devc->model_state;
 210
 211         switch (key) {
 212         case SR_CONF_NUM_TIMEBASE:
 213                 *data = g_variant_new_int32(model->num_xdivs);
 214                 ret = SR_OK;
 215                 break;
 216         case SR_CONF_TIMEBASE:
 217                 *data = g_variant_new("(tt)",
 218                                 (*model->timebases)[state->timebase][0],
 219                                 (*model->timebases)[state->timebase][1]);
 220                 ret = SR_OK;
 221                 break;
 222         case SR_CONF_NUM_VDIV:
 223                 if (cg_type == CG_NONE) {
 224                         sr_err("No channel group specified.");
 225                         return SR_ERR_CHANNEL_GROUP;
 226                 } else if (cg_type == CG_ANALOG) {
 227                                 *data = g_variant_new_int32(model->num_ydivs);
 228                                 ret = SR_OK;
 229                                 break;
 230                 } else {
 231                         ret = SR_ERR_NA;
 232                 }
 233                 break;
 234         case SR_CONF_VDIV:
 235                 ret = SR_ERR_NA;
 236                 if (cg_type == CG_NONE) {
 237                         sr_err("No channel group specified.");
 238                         return SR_ERR_CHANNEL_GROUP;
 239                 } else if (cg_type != CG_ANALOG)
 240                         break;
 241
 242                 for (i = 0; i < model->analog_channels; ++i) {
 243                         if (cg != devc->analog_groups[i])
 244                                 continue;
 245                         *data = g_variant_new("(tt)",
 246                                         (*model->vdivs)[state->analog_states[i].vdiv][0],
 247                                         (*model->vdivs)[state->analog_states[i].vdiv][1]);
 248                         ret = SR_OK;
 249                         break;
 250                 }
 251                 break;
 252         case SR_CONF_TRIGGER_SOURCE:
 253                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 254                 ret = SR_OK;
 255                 break;
 256         case SR_CONF_TRIGGER_SLOPE:
 257                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 258                 ret = SR_OK;
 259                 break;
 260         case SR_CONF_HORIZ_TRIGGERPOS:
 261                 *data = g_variant_new_double(state->horiz_triggerpos);
 262                 ret = SR_OK;
 263                 break;
 264         case SR_CONF_COUPLING:
 265                 ret = SR_ERR_NA;
 266                 if (cg_type == CG_NONE) {
 267                         sr_err("No channel group specified.");
 268                         return SR_ERR_CHANNEL_GROUP;
 269                 } else if (cg_type != CG_ANALOG)
 270                         break;
 271
 272                 for (i = 0; i < model->analog_channels; ++i) {
 273                         if (cg != devc->analog_groups[i])
 274                                 continue;
 275                         *data = g_variant_new_string((*model->coupling_options)[state->analog_states[i].coupling]);
 276                         ret = SR_OK;
 277                         break;
 278                 }
 279                 break;
 280         case SR_CONF_SAMPLERATE:
 281                 *data = g_variant_new_uint64(state->sample_rate);
 282                 ret = SR_OK;
 283                 break;
 284         default:
 285                 ret = SR_ERR_NA;
 286         }
 287
 288         return ret;
 289 }
 290
 291 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 292 {
 293         unsigned int i;
 294         GVariant *rational[2];
 295         GVariantBuilder gvb;
 296
 297         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 298
 299         for (i = 0; i < n; i++) {
 300                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 301                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 302
 303                 /* FIXME: Valgrind reports a memory leak here. */
 304                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 305         }
 306
 307         return g_variant_builder_end(&gvb);
 308 }
 309
 310 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 311                 const struct sr_channel_group *cg)
 312 {
 313         int ret, cg_type;
 314         unsigned int i, j;
 315         char float_str[30];
 316         struct dev_context *devc;
 317         struct scope_config *model;
 318         struct scope_state *state;
 319         const char *tmp;
 320         uint64_t p, q;
 321         double tmp_d;
 322         gboolean update_sample_rate;
 323
 324         if (!sdi || !(devc = sdi->priv))
 325                 return SR_ERR_ARG;
 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                         /* TODO: A and B trigger support possible? */
 348                         ret = dlm_trigger_source_set(sdi->conn, (*model->trigger_sources)[i]);
 349                         break;
 350                 }
 351                 break;
 352         case SR_CONF_VDIV:
 353                 if (cg_type == CG_NONE) {
 354                         sr_err("No channel group specified.");
 355                         return SR_ERR_CHANNEL_GROUP;
 356                 }
 357
 358                 g_variant_get(data, "(tt)", &p, &q);
 359
 360                 for (i = 0; i < model->num_vdivs; i++) {
 361                         if (p != (*model->vdivs)[i][0] ||
 362                                         q != (*model->vdivs)[i][1])
 363                                 continue;
 364                         for (j = 1; j <= model->analog_channels; ++j) {
 365                                 if (cg != devc->analog_groups[j - 1])
 366                                         continue;
 367                                 state->analog_states[j - 1].vdiv = i;
 368                                 g_ascii_formatd(float_str, sizeof(float_str),
 369                                                 "%E", (float) p / q);
 370                                 if (dlm_analog_chan_vdiv_set(sdi->conn, j, float_str) != SR_OK ||
 371                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 372                                         return SR_ERR;
 373
 374                                 break;
 375                         }
 376
 377                         ret = SR_OK;
 378                         break;
 379                 }
 380                 break;
 381         case SR_CONF_TIMEBASE:
 382                 g_variant_get(data, "(tt)", &p, &q);
 383
 384                 for (i = 0; i < model->num_timebases; i++) {
 385                         if (p != (*model->timebases)[i][0] ||
 386                                         q != (*model->timebases)[i][1])
 387                                 continue;
 388                         state->timebase = i;
 389                         g_ascii_formatd(float_str, sizeof(float_str),
 390                                         "%E", (float) p / q);
 391                         ret = dlm_timebase_set(sdi->conn, float_str);
 392                         update_sample_rate = TRUE;
 393                         break;
 394                 }
 395                 break;
 396         case SR_CONF_HORIZ_TRIGGERPOS:
 397                 tmp_d = g_variant_get_double(data);
 398
 399                 /* TODO: Check if the calculation makes sense for the DLM. */
 400                 if (tmp_d < 0.0 || tmp_d > 1.0)
 401                         return SR_ERR;
 402
 403                 state->horiz_triggerpos = tmp_d;
 404                 tmp_d = -(tmp_d - 0.5) *
 405                                 ((double) (*model->timebases)[state->timebase][0] /
 406                                 (*model->timebases)[state->timebase][1])
 407                                 * model->num_xdivs;
 408
 409                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 410                 ret = dlm_horiz_trigger_pos_set(sdi->conn, float_str);
 411                 break;
 412         case SR_CONF_TRIGGER_SLOPE:
 413                 tmp = g_variant_get_string(data, NULL);
 414
 415                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 416                         return SR_ERR_ARG;
 417
 418                 /* Note: See dlm_trigger_slopes[] in protocol.c. */
 419                 state->trigger_slope = (tmp[0] == 'r') ?
 420                                 SLOPE_POSITIVE : SLOPE_NEGATIVE;
 421
 422                 ret = dlm_trigger_slope_set(sdi->conn, state->trigger_slope);
 423                 break;
 424         case SR_CONF_COUPLING:
 425                 if (cg_type == CG_NONE) {
 426                         sr_err("No channel group specified.");
 427                         return SR_ERR_CHANNEL_GROUP;
 428                 }
 429
 430                 tmp = g_variant_get_string(data, NULL);
 431
 432                 for (i = 0; (*model->coupling_options)[i]; i++) {
 433                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 434                                 continue;
 435                         for (j = 1; j <= model->analog_channels; ++j) {
 436                                 if (cg != devc->analog_groups[j - 1])
 437                                         continue;
 438                                 state->analog_states[j-1].coupling = i;
 439
 440                                 if (dlm_analog_chan_coupl_set(sdi->conn, j, tmp) != SR_OK ||
 441                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 442                                         return SR_ERR;
 443                                 break;
 444                         }
 445
 446                         ret = SR_OK;
 447                         break;
 448                 }
 449                 break;
 450         default:
 451                 ret = SR_ERR_NA;
 452                 break;
 453         }
 454
 455         if (ret == SR_OK)
 456                 ret = sr_scpi_get_opc(sdi->conn);
 457
 458         if (ret == SR_OK && update_sample_rate)
 459                 ret = dlm_sample_rate_query(sdi);
 460
 461         return ret;
 462 }
 463
 464 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 465                 const struct sr_channel_group *cg)
 466 {
 467         int cg_type;
 468         struct dev_context *devc;
 469         struct scope_config *model;
 470
 471         if (!sdi || !(devc = sdi->priv))
 472                 return SR_ERR_ARG;
 473
 474         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 475                 return SR_ERR;
 476
 477         model = devc->model_config;
 478
 479         switch (key) {
 480         case SR_CONF_SCAN_OPTIONS:
 481                 *data = NULL;
 482                 break;
 483         case SR_CONF_DEVICE_OPTIONS:
 484                 if (cg_type == CG_NONE) {
 485                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 486                                 model->hw_caps, model->num_hwcaps, sizeof(uint32_t));
 487                 } else if (cg_type == CG_ANALOG) {
 488                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 489                                 model->analog_hwcaps, model->num_analog_hwcaps, sizeof(uint32_t));
 490                 } else {
 491                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 492                                 NULL, 0, sizeof(uint32_t));
 493                 }
 494                 break;
 495         case SR_CONF_COUPLING:
 496                 if (cg_type == CG_NONE)
 497                         return SR_ERR_CHANNEL_GROUP;
 498                 *data = g_variant_new_strv(*model->coupling_options,
 499                                 g_strv_length((char **)*model->coupling_options));
 500                 break;
 501         case SR_CONF_TRIGGER_SOURCE:
 502                 *data = g_variant_new_strv(*model->trigger_sources,
 503                                 g_strv_length((char **)*model->trigger_sources));
 504                 break;
 505         case SR_CONF_TRIGGER_SLOPE:
 506                 *data = g_variant_new_strv(*model->trigger_slopes,
 507                                 g_strv_length((char **)*model->trigger_slopes));
 508                 break;
 509         case SR_CONF_TIMEBASE:
 510                 *data = build_tuples(model->timebases, model->num_timebases);
 511                 break;
 512         case SR_CONF_VDIV:
 513                 if (cg_type == CG_NONE)
 514                         return SR_ERR_CHANNEL_GROUP;
 515                 *data = build_tuples(model->vdivs, model->num_vdivs);
 516                 break;
 517         default:
 518                 return SR_ERR_NA;
 519         }
 520
 521         return SR_OK;
 522 }
 523
 524 static int dlm_check_channels(GSList *channels)
 525 {
 526         GSList *l;
 527         struct sr_channel *ch;
 528         gboolean enabled_pod1, enabled_chan4;
 529
 530         enabled_pod1 = enabled_chan4 = FALSE;
 531
 532         /* Note: On the DLM2000, CH4 and Logic are shared. */
 533         /* TODO Handle non-DLM2000 models. */
 534         for (l = channels; l; l = l->next) {
 535                 ch = l->data;
 536                 switch (ch->type) {
 537                 case SR_CHANNEL_ANALOG:
 538                         if (ch->index == 3)
 539                                 enabled_chan4 = TRUE;
 540                         break;
 541                 case SR_CHANNEL_LOGIC:
 542                         enabled_pod1 = TRUE;
 543                         break;
 544                 default:
 545                         return SR_ERR;
 546                 }
 547         }
 548
 549         if (enabled_pod1 && enabled_chan4)
 550                 return SR_ERR;
 551
 552         return SR_OK;
 553 }
 554
 555 static int dlm_setup_channels(const struct sr_dev_inst *sdi)
 556 {
 557         GSList *l;
 558         unsigned int i;
 559         gboolean *pod_enabled, setup_changed;
 560         struct scope_state *state;
 561         struct scope_config *model;
 562         struct sr_channel *ch;
 563         struct dev_context *devc;
 564         struct sr_scpi_dev_inst *scpi;
 565
 566         devc = sdi->priv;
 567         scpi = sdi->conn;
 568         state = devc->model_state;
 569         model = devc->model_config;
 570         setup_changed = FALSE;
 571
 572         pod_enabled = g_malloc0(sizeof(gboolean) * model->pods);
 573
 574         for (l = sdi->channels; l; l = l->next) {
 575                 ch = l->data;
 576                 switch (ch->type) {
 577                 case SR_CHANNEL_ANALOG:
 578                         if (ch->enabled == state->analog_states[ch->index].state)
 579                                 break;
 580
 581                         if (dlm_analog_chan_state_set(scpi, ch->index + 1,
 582                                         ch->enabled) != SR_OK)
 583                                 return SR_ERR;
 584
 585                         state->analog_states[ch->index].state = ch->enabled;
 586                         setup_changed = TRUE;
 587                         break;
 588                 case SR_CHANNEL_LOGIC:
 589                         if (ch->enabled)
 590                                 pod_enabled[ch->index / 8] = TRUE;
 591
 592                         if (ch->enabled == state->digital_states[ch->index])
 593                                 break;
 594
 595                         if (dlm_digital_chan_state_set(scpi, ch->index + 1,
 596                                         ch->enabled) != SR_OK)
 597                                 return SR_ERR;
 598
 599                         state->digital_states[ch->index] = ch->enabled;
 600                         setup_changed = TRUE;
 601                         break;
 602                 default:
 603                         return SR_ERR;
 604                 }
 605         }
 606
 607         for (i = 1; i <= model->pods; ++i) {
 608                 if (state->pod_states[i - 1] == pod_enabled[i - 1])
 609                         continue;
 610
 611                 if (dlm_digital_pod_state_set(scpi, i,
 612                                 pod_enabled[i - 1]) != SR_OK)
 613                         return SR_ERR;
 614
 615                 state->pod_states[i - 1] = pod_enabled[i - 1];
 616                 setup_changed = TRUE;
 617         }
 618
 619         g_free(pod_enabled);
 620
 621         if (setup_changed && dlm_sample_rate_query(sdi) != SR_OK)
 622                 return SR_ERR;
 623
 624         return SR_OK;
 625 }
 626
 627 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 628 {
 629         GSList *l;
 630         gboolean digital_added;
 631         struct sr_channel *ch;
 632         struct dev_context *devc;
 633         struct sr_scpi_dev_inst *scpi;
 634
 635         (void)cb_data;
 636
 637         if (sdi->status != SR_ST_ACTIVE)
 638                 return SR_ERR_DEV_CLOSED;
 639
 640         scpi = sdi->conn;
 641         devc = sdi->priv;
 642         digital_added = FALSE;
 643
 644         g_slist_free(devc->enabled_channels);
 645         devc->enabled_channels = NULL;
 646
 647         for (l = sdi->channels; l; l = l->next) {
 648                 ch = l->data;
 649                 if (!ch->enabled)
 650                         continue;
 651                 /* Only add a single digital channel. */
 652                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 653                         devc->enabled_channels = g_slist_append(
 654                                 devc->enabled_channels, ch);
 655                         if (ch->type == SR_CHANNEL_LOGIC)
 656                                 digital_added = TRUE;
 657                 }
 658         }
 659
 660         if (!devc->enabled_channels)
 661                 return SR_ERR;
 662
 663         if (dlm_check_channels(devc->enabled_channels) != SR_OK) {
 664                 sr_err("Invalid channel configuration specified!");
 665                 return SR_ERR_NA;
 666         }
 667
 668         if (dlm_setup_channels(sdi) != SR_OK) {
 669                 sr_err("Failed to setup channel configuration!");
 670                 return SR_ERR;
 671         }
 672
 673         /* Request data for the first enabled channel. */
 674         devc->current_channel = devc->enabled_channels;
 675         dlm_channel_data_request(sdi);
 676
 677         /* Call our callback when data comes in or after 5ms. */
 678         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 5,
 679                         dlm_data_receive, (void *)sdi);
 680
 681         return SR_OK;
 682 }
 683
 684 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 685 {
 686         struct dev_context *devc;
 687         struct sr_datafeed_packet packet;
 688
 689         (void)cb_data;
 690
 691         packet.type = SR_DF_END;
 692         packet.payload = NULL;
 693         sr_session_send(sdi, &packet);
 694
 695         if (sdi->status != SR_ST_ACTIVE)
 696                 return SR_ERR_DEV_CLOSED;
 697
 698         devc = sdi->priv;
 699
 700         devc->num_frames = 0;
 701         g_slist_free(devc->enabled_channels);
 702         devc->enabled_channels = NULL;
 703
 704         sr_scpi_source_remove(sdi->session, sdi->conn);
 705
 706         return SR_OK;
 707 }
 708
 709 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info = {
 710         .name = "yokogawa-dlm",
 711         .longname = "Yokogawa DL/DLM",
 712         .api_version = 1,
 713         .init = init,
 714         .cleanup = cleanup,
 715         .scan = scan,
 716         .dev_list = dev_list,
 717         .dev_clear = dev_clear,
 718         .config_get = config_get,
 719         .config_set = config_set,
 720         .config_list = config_list,
 721         .dev_open = dev_open,
 722         .dev_close = dev_close,
 723         .dev_acquisition_start = dev_acquisition_start,
 724         .dev_acquisition_stop = dev_acquisition_stop,
 725         .priv = NULL,
 726 };