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(SR_ST_ACTIVE, MANUFACTURER_NAME,
  66                         model_name, hw_info->firmware_version)))
  67                 goto fail;
  68
  69         sdi->serial_num = g_strdup(hw_info->serial_number);
  70
  71         sr_scpi_hw_info_free(hw_info);
  72         hw_info = NULL;
  73
  74         devc = g_malloc0(sizeof(struct dev_context));
  75
  76         sdi->driver = di;
  77         sdi->priv = devc;
  78         sdi->inst_type = SR_INST_SCPI;
  79         sdi->conn = scpi;
  80
  81         if (dlm_device_init(sdi, model_index) != SR_OK)
  82                 goto fail;
  83
  84         sr_scpi_close(sdi->conn);
  85
  86         sdi->status = SR_ST_INACTIVE;
  87         return sdi;
  88
  89 fail:
  90         if (hw_info)
  91                 sr_scpi_hw_info_free(hw_info);
  92         if (sdi)
  93                 sr_dev_inst_free(sdi);
  94         if (devc)
  95                 g_free(devc);
  96
  97         return NULL;
  98 }
  99
 100 static GSList *scan(GSList *options)
 101 {
 102         return sr_scpi_scan(di->priv, options, probe_usbtmc_device);
 103 }
 104
 105 static GSList *dev_list(void)
 106 {
 107         return ((struct drv_context *)(di->priv))->instances;
 108 }
 109
 110 static void clear_helper(void *priv)
 111 {
 112         struct dev_context *devc;
 113
 114         devc = priv;
 115
 116         dlm_scope_state_destroy(devc->model_state);
 117
 118         g_free(devc->analog_groups);
 119         g_free(devc->digital_groups);
 120         g_free(devc);
 121 }
 122
 123 static int dev_clear(void)
 124 {
 125         return std_dev_clear(di, clear_helper);
 126 }
 127
 128 static int dev_open(struct sr_dev_inst *sdi)
 129 {
 130         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 131                 return SR_ERR;
 132
 133         if (dlm_scope_state_query(sdi) != SR_OK)
 134                 return SR_ERR;
 135
 136         sdi->status = SR_ST_ACTIVE;
 137
 138         return SR_OK;
 139 }
 140
 141 static int dev_close(struct sr_dev_inst *sdi)
 142 {
 143         if (sdi->status == SR_ST_INACTIVE)
 144                 return SR_OK;
 145
 146         sr_scpi_close(sdi->conn);
 147
 148         sdi->status = SR_ST_INACTIVE;
 149
 150         return SR_OK;
 151 }
 152
 153 static int cleanup(void)
 154 {
 155         dev_clear();
 156
 157         return SR_OK;
 158 }
 159
 160 /**
 161  * Check which category a given channel group belongs to.
 162  *
 163  * @param devc Our internal device context.
 164  * @param cg   The channel group to check.
 165  *
 166  * @retval CG_NONE    cg is NULL
 167  * @retval CG_ANALOG  cg is an analog group
 168  * @retval CG_DIGITAL cg is a digital group
 169  * @retval CG_INVALID cg is something else
 170  */
 171 static int check_channel_group(struct dev_context *devc,
 172                         const struct sr_channel_group *cg)
 173 {
 174         unsigned int i;
 175         struct scope_config *model;
 176
 177         model = devc->model_config;
 178
 179         if (!cg)
 180                 return CG_NONE;
 181
 182         for (i = 0; i < model->analog_channels; ++i)
 183                 if (cg == devc->analog_groups[i])
 184                         return CG_ANALOG;
 185
 186         for (i = 0; i < model->pods; ++i)
 187                 if (cg == devc->digital_groups[i])
 188                         return CG_DIGITAL;
 189
 190         sr_err("Invalid channel group specified.");
 191         return CG_INVALID;
 192 }
 193
 194 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 195                 const struct sr_channel_group *cg)
 196 {
 197         int ret, cg_type;
 198         unsigned int i;
 199         struct dev_context *devc;
 200         struct scope_config *model;
 201         struct scope_state *state;
 202
 203         if (!sdi || !(devc = sdi->priv))
 204                 return SR_ERR_ARG;
 205
 206         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 207                 return SR_ERR;
 208
 209         ret = SR_ERR_NA;
 210         model = devc->model_config;
 211         state = devc->model_state;
 212
 213         switch (key) {
 214         case SR_CONF_NUM_TIMEBASE:
 215                 *data = g_variant_new_int32(model->num_xdivs);
 216                 ret = SR_OK;
 217                 break;
 218         case SR_CONF_TIMEBASE:
 219                 *data = g_variant_new("(tt)",
 220                                 (*model->timebases)[state->timebase][0],
 221                                 (*model->timebases)[state->timebase][1]);
 222                 ret = SR_OK;
 223                 break;
 224         case SR_CONF_NUM_VDIV:
 225                 if (cg_type == CG_NONE) {
 226                         sr_err("No channel group specified.");
 227                         return SR_ERR_CHANNEL_GROUP;
 228                 } else if (cg_type == CG_ANALOG) {
 229                                 *data = g_variant_new_int32(model->num_ydivs);
 230                                 ret = SR_OK;
 231                                 break;
 232                 } else {
 233                         ret = SR_ERR_NA;
 234                 }
 235                 break;
 236         case SR_CONF_VDIV:
 237                 ret = SR_ERR_NA;
 238                 if (cg_type == CG_NONE) {
 239                         sr_err("No channel group specified.");
 240                         return SR_ERR_CHANNEL_GROUP;
 241                 } else if (cg_type != CG_ANALOG)
 242                         break;
 243
 244                 for (i = 0; i < model->analog_channels; ++i) {
 245                         if (cg != devc->analog_groups[i])
 246                                 continue;
 247                         *data = g_variant_new("(tt)",
 248                                         (*model->vdivs)[state->analog_states[i].vdiv][0],
 249                                         (*model->vdivs)[state->analog_states[i].vdiv][1]);
 250                         ret = SR_OK;
 251                         break;
 252                 }
 253                 break;
 254         case SR_CONF_TRIGGER_SOURCE:
 255                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 256                 ret = SR_OK;
 257                 break;
 258         case SR_CONF_TRIGGER_SLOPE:
 259                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 260                 ret = SR_OK;
 261                 break;
 262         case SR_CONF_HORIZ_TRIGGERPOS:
 263                 *data = g_variant_new_double(state->horiz_triggerpos);
 264                 ret = SR_OK;
 265                 break;
 266         case SR_CONF_COUPLING:
 267                 ret = SR_ERR_NA;
 268                 if (cg_type == CG_NONE) {
 269                         sr_err("No channel group specified.");
 270                         return SR_ERR_CHANNEL_GROUP;
 271                 } else if (cg_type != CG_ANALOG)
 272                         break;
 273
 274                 for (i = 0; i < model->analog_channels; ++i) {
 275                         if (cg != devc->analog_groups[i])
 276                                 continue;
 277                         *data = g_variant_new_string((*model->coupling_options)[state->analog_states[i].coupling]);
 278                         ret = SR_OK;
 279                         break;
 280                 }
 281                 break;
 282         case SR_CONF_SAMPLERATE:
 283                 *data = g_variant_new_uint64(state->sample_rate);
 284                 ret = SR_OK;
 285                 break;
 286         default:
 287                 ret = SR_ERR_NA;
 288         }
 289
 290         return ret;
 291 }
 292
 293 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 294 {
 295         unsigned int i;
 296         GVariant *rational[2];
 297         GVariantBuilder gvb;
 298
 299         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 300
 301         for (i = 0; i < n; i++) {
 302                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 303                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 304
 305                 /* FIXME: Valgrind reports a memory leak here. */
 306                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 307         }
 308
 309         return g_variant_builder_end(&gvb);
 310 }
 311
 312 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 313                 const struct sr_channel_group *cg)
 314 {
 315         int ret, cg_type;
 316         unsigned int i, j;
 317         char float_str[30];
 318         struct dev_context *devc;
 319         struct scope_config *model;
 320         struct scope_state *state;
 321         const char *tmp;
 322         uint64_t p, q;
 323         double tmp_d;
 324         gboolean update_sample_rate;
 325
 326         if (!sdi || !(devc = sdi->priv))
 327                 return SR_ERR_ARG;
 328
 329         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 330                 return SR_ERR;
 331
 332         model = devc->model_config;
 333         state = devc->model_state;
 334         update_sample_rate = FALSE;
 335
 336         ret = SR_ERR_NA;
 337
 338         switch (key) {
 339         case SR_CONF_LIMIT_FRAMES:
 340                 devc->frame_limit = g_variant_get_uint64(data);
 341                 ret = SR_OK;
 342                 break;
 343         case SR_CONF_TRIGGER_SOURCE:
 344                 tmp = g_variant_get_string(data, NULL);
 345                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 346                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 347                                 continue;
 348                         state->trigger_source = i;
 349                         /* TODO: A and B trigger support possible? */
 350                         ret = dlm_trigger_source_set(sdi->conn, (*model->trigger_sources)[i]);
 351                         break;
 352                 }
 353                 break;
 354         case SR_CONF_VDIV:
 355                 if (cg_type == CG_NONE) {
 356                         sr_err("No channel group specified.");
 357                         return SR_ERR_CHANNEL_GROUP;
 358                 }
 359
 360                 g_variant_get(data, "(tt)", &p, &q);
 361
 362                 for (i = 0; i < model->num_vdivs; i++) {
 363                         if (p != (*model->vdivs)[i][0] ||
 364                                         q != (*model->vdivs)[i][1])
 365                                 continue;
 366                         for (j = 1; j <= model->analog_channels; ++j) {
 367                                 if (cg != devc->analog_groups[j - 1])
 368                                         continue;
 369                                 state->analog_states[j - 1].vdiv = i;
 370                                 g_ascii_formatd(float_str, sizeof(float_str),
 371                                                 "%E", (float) p / q);
 372                                 if (dlm_analog_chan_vdiv_set(sdi->conn, j, float_str) != SR_OK ||
 373                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 374                                         return SR_ERR;
 375
 376                                 break;
 377                         }
 378
 379                         ret = SR_OK;
 380                         break;
 381                 }
 382                 break;
 383         case SR_CONF_TIMEBASE:
 384                 g_variant_get(data, "(tt)", &p, &q);
 385
 386                 for (i = 0; i < model->num_timebases; i++) {
 387                         if (p != (*model->timebases)[i][0] ||
 388                                         q != (*model->timebases)[i][1])
 389                                 continue;
 390                         state->timebase = i;
 391                         g_ascii_formatd(float_str, sizeof(float_str),
 392                                         "%E", (float) p / q);
 393                         ret = dlm_timebase_set(sdi->conn, float_str);
 394                         update_sample_rate = TRUE;
 395                         break;
 396                 }
 397                 break;
 398         case SR_CONF_HORIZ_TRIGGERPOS:
 399                 tmp_d = g_variant_get_double(data);
 400
 401                 /* TODO: Check if the calculation makes sense for the DLM. */
 402                 if (tmp_d < 0.0 || tmp_d > 1.0)
 403                         return SR_ERR;
 404
 405                 state->horiz_triggerpos = tmp_d;
 406                 tmp_d = -(tmp_d - 0.5) *
 407                                 ((double) (*model->timebases)[state->timebase][0] /
 408                                 (*model->timebases)[state->timebase][1])
 409                                 * model->num_xdivs;
 410
 411                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 412                 ret = dlm_horiz_trigger_pos_set(sdi->conn, float_str);
 413                 break;
 414         case SR_CONF_TRIGGER_SLOPE:
 415                 tmp = g_variant_get_string(data, NULL);
 416
 417                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 418                         return SR_ERR_ARG;
 419
 420                 /* Note: See dlm_trigger_slopes[] in protocol.c. */
 421                 state->trigger_slope = (tmp[0] == 'r') ?
 422                                 SLOPE_POSITIVE : SLOPE_NEGATIVE;
 423
 424                 ret = dlm_trigger_slope_set(sdi->conn, state->trigger_slope);
 425                 break;
 426         case SR_CONF_COUPLING:
 427                 if (cg_type == CG_NONE) {
 428                         sr_err("No channel group specified.");
 429                         return SR_ERR_CHANNEL_GROUP;
 430                 }
 431
 432                 tmp = g_variant_get_string(data, NULL);
 433
 434                 for (i = 0; (*model->coupling_options)[i]; i++) {
 435                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 436                                 continue;
 437                         for (j = 1; j <= model->analog_channels; ++j) {
 438                                 if (cg != devc->analog_groups[j - 1])
 439                                         continue;
 440                                 state->analog_states[j-1].coupling = i;
 441
 442                                 if (dlm_analog_chan_coupl_set(sdi->conn, j, tmp) != SR_OK ||
 443                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 444                                         return SR_ERR;
 445                                 break;
 446                         }
 447
 448                         ret = SR_OK;
 449                         break;
 450                 }
 451                 break;
 452         default:
 453                 ret = SR_ERR_NA;
 454                 break;
 455         }
 456
 457         if (ret == SR_OK)
 458                 ret = sr_scpi_get_opc(sdi->conn);
 459
 460         if (ret == SR_OK && update_sample_rate)
 461                 ret = dlm_sample_rate_query(sdi);
 462
 463         return ret;
 464 }
 465
 466 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 467                 const struct sr_channel_group *cg)
 468 {
 469         int cg_type;
 470         struct dev_context *devc;
 471         struct scope_config *model;
 472
 473         if (!sdi || !(devc = sdi->priv))
 474                 return SR_ERR_ARG;
 475
 476         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 477                 return SR_ERR;
 478
 479         model = devc->model_config;
 480
 481         switch (key) {
 482         case SR_CONF_DEVICE_OPTIONS:
 483                 if (cg_type == CG_NONE) {
 484                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 485                                 model->devopts, model->num_devopts, sizeof(uint32_t));
 486                 } else if (cg_type == CG_ANALOG) {
 487                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 488                                 model->analog_devopts, model->num_analog_devopts, sizeof(uint32_t));
 489                 } else {
 490                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 491                                 NULL, 0, sizeof(uint32_t));
 492                 }
 493                 break;
 494         case SR_CONF_COUPLING:
 495                 if (cg_type == CG_NONE)
 496                         return SR_ERR_CHANNEL_GROUP;
 497                 *data = g_variant_new_strv(*model->coupling_options,
 498                                 g_strv_length((char **)*model->coupling_options));
 499                 break;
 500         case SR_CONF_TRIGGER_SOURCE:
 501                 *data = g_variant_new_strv(*model->trigger_sources,
 502                                 g_strv_length((char **)*model->trigger_sources));
 503                 break;
 504         case SR_CONF_TRIGGER_SLOPE:
 505                 *data = g_variant_new_strv(*model->trigger_slopes,
 506                                 g_strv_length((char **)*model->trigger_slopes));
 507                 break;
 508         case SR_CONF_TIMEBASE:
 509                 *data = build_tuples(model->timebases, model->num_timebases);
 510                 break;
 511         case SR_CONF_VDIV:
 512                 if (cg_type == CG_NONE)
 513                         return SR_ERR_CHANNEL_GROUP;
 514                 *data = build_tuples(model->vdivs, model->num_vdivs);
 515                 break;
 516         default:
 517                 return SR_ERR_NA;
 518         }
 519
 520         return SR_OK;
 521 }
 522
 523 static int dlm_check_channels(GSList *channels)
 524 {
 525         GSList *l;
 526         struct sr_channel *ch;
 527         gboolean enabled_pod1, enabled_chan4;
 528
 529         enabled_pod1 = enabled_chan4 = FALSE;
 530
 531         /* Note: On the DLM2000, CH4 and Logic are shared. */
 532         /* TODO Handle non-DLM2000 models. */
 533         for (l = channels; l; l = l->next) {
 534                 ch = l->data;
 535                 switch (ch->type) {
 536                 case SR_CHANNEL_ANALOG:
 537                         if (ch->index == 3)
 538                                 enabled_chan4 = TRUE;
 539                         break;
 540                 case SR_CHANNEL_LOGIC:
 541                         enabled_pod1 = TRUE;
 542                         break;
 543                 default:
 544                         return SR_ERR;
 545                 }
 546         }
 547
 548         if (enabled_pod1 && enabled_chan4)
 549                 return SR_ERR;
 550
 551         return SR_OK;
 552 }
 553
 554 static int dlm_setup_channels(const struct sr_dev_inst *sdi)
 555 {
 556         GSList *l;
 557         unsigned int i;
 558         gboolean *pod_enabled, setup_changed;
 559         struct scope_state *state;
 560         struct scope_config *model;
 561         struct sr_channel *ch;
 562         struct dev_context *devc;
 563         struct sr_scpi_dev_inst *scpi;
 564
 565         devc = sdi->priv;
 566         scpi = sdi->conn;
 567         state = devc->model_state;
 568         model = devc->model_config;
 569         setup_changed = FALSE;
 570
 571         pod_enabled = g_malloc0(sizeof(gboolean) * model->pods);
 572
 573         for (l = sdi->channels; l; l = l->next) {
 574                 ch = l->data;
 575                 switch (ch->type) {
 576                 case SR_CHANNEL_ANALOG:
 577                         if (ch->enabled == state->analog_states[ch->index].state)
 578                                 break;
 579
 580                         if (dlm_analog_chan_state_set(scpi, ch->index + 1,
 581                                         ch->enabled) != SR_OK)
 582                                 return SR_ERR;
 583
 584                         state->analog_states[ch->index].state = ch->enabled;
 585                         setup_changed = TRUE;
 586                         break;
 587                 case SR_CHANNEL_LOGIC:
 588                         if (ch->enabled)
 589                                 pod_enabled[ch->index / 8] = TRUE;
 590
 591                         if (ch->enabled == state->digital_states[ch->index])
 592                                 break;
 593
 594                         if (dlm_digital_chan_state_set(scpi, ch->index + 1,
 595                                         ch->enabled) != SR_OK)
 596                                 return SR_ERR;
 597
 598                         state->digital_states[ch->index] = ch->enabled;
 599                         setup_changed = TRUE;
 600                         break;
 601                 default:
 602                         return SR_ERR;
 603                 }
 604         }
 605
 606         for (i = 1; i <= model->pods; ++i) {
 607                 if (state->pod_states[i - 1] == pod_enabled[i - 1])
 608                         continue;
 609
 610                 if (dlm_digital_pod_state_set(scpi, i,
 611                                 pod_enabled[i - 1]) != SR_OK)
 612                         return SR_ERR;
 613
 614                 state->pod_states[i - 1] = pod_enabled[i - 1];
 615                 setup_changed = TRUE;
 616         }
 617
 618         g_free(pod_enabled);
 619
 620         if (setup_changed && dlm_sample_rate_query(sdi) != SR_OK)
 621                 return SR_ERR;
 622
 623         return SR_OK;
 624 }
 625
 626 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 627 {
 628         GSList *l;
 629         gboolean digital_added;
 630         struct sr_channel *ch;
 631         struct dev_context *devc;
 632         struct sr_scpi_dev_inst *scpi;
 633
 634         (void)cb_data;
 635
 636         if (sdi->status != SR_ST_ACTIVE)
 637                 return SR_ERR_DEV_CLOSED;
 638
 639         scpi = sdi->conn;
 640         devc = sdi->priv;
 641         digital_added = FALSE;
 642
 643         g_slist_free(devc->enabled_channels);
 644         devc->enabled_channels = NULL;
 645
 646         for (l = sdi->channels; l; l = l->next) {
 647                 ch = l->data;
 648                 if (!ch->enabled)
 649                         continue;
 650                 /* Only add a single digital channel. */
 651                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 652                         devc->enabled_channels = g_slist_append(
 653                                 devc->enabled_channels, ch);
 654                         if (ch->type == SR_CHANNEL_LOGIC)
 655                                 digital_added = TRUE;
 656                 }
 657         }
 658
 659         if (!devc->enabled_channels)
 660                 return SR_ERR;
 661
 662         if (dlm_check_channels(devc->enabled_channels) != SR_OK) {
 663                 sr_err("Invalid channel configuration specified!");
 664                 return SR_ERR_NA;
 665         }
 666
 667         if (dlm_setup_channels(sdi) != SR_OK) {
 668                 sr_err("Failed to setup channel configuration!");
 669                 return SR_ERR;
 670         }
 671
 672         /* Request data for the first enabled channel. */
 673         devc->current_channel = devc->enabled_channels;
 674         dlm_channel_data_request(sdi);
 675
 676         /* Call our callback when data comes in or after 5ms. */
 677         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 5,
 678                         dlm_data_receive, (void *)sdi);
 679
 680         return SR_OK;
 681 }
 682
 683 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 684 {
 685         struct dev_context *devc;
 686         struct sr_datafeed_packet packet;
 687
 688         (void)cb_data;
 689
 690         packet.type = SR_DF_END;
 691         packet.payload = NULL;
 692         sr_session_send(sdi, &packet);
 693
 694         if (sdi->status != SR_ST_ACTIVE)
 695                 return SR_ERR_DEV_CLOSED;
 696
 697         devc = sdi->priv;
 698
 699         devc->num_frames = 0;
 700         g_slist_free(devc->enabled_channels);
 701         devc->enabled_channels = NULL;
 702
 703         sr_scpi_source_remove(sdi->session, sdi->conn);
 704
 705         return SR_OK;
 706 }
 707
 708 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info = {
 709         .name = "yokogawa-dlm",
 710         .longname = "Yokogawa DL/DLM",
 711         .api_version = 1,
 712         .init = init,
 713         .cleanup = cleanup,
 714         .scan = scan,
 715         .dev_list = dev_list,
 716         .dev_clear = dev_clear,
 717         .config_get = config_get,
 718         .config_set = config_set,
 719         .config_list = config_list,
 720         .dev_open = dev_open,
 721         .dev_close = dev_close,
 722         .dev_acquisition_start = dev_acquisition_start,
 723         .dev_acquisition_stop = dev_acquisition_stop,
 724         .priv = NULL,
 725 };