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         if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
  73                 goto fail;
  74
  75         sdi->driver = di;
  76         sdi->priv = devc;
  77         sdi->inst_type = SR_INST_SCPI;
  78         sdi->conn = scpi;
  79
  80         if (dlm_device_init(sdi, model_index) != SR_OK)
  81                 goto fail;
  82
  83         sr_scpi_close(sdi->conn);
  84
  85         sdi->status = SR_ST_INACTIVE;
  86         return sdi;
  87
  88 fail:
  89         if (hw_info)
  90                 sr_scpi_hw_info_free(hw_info);
  91         if (sdi)
  92                 sr_dev_inst_free(sdi);
  93         if (devc)
  94                 g_free(devc);
  95
  96         return NULL;
  97 }
  98
  99 static GSList *scan(GSList *options)
 100 {
 101         return sr_scpi_scan(di->priv, options, probe_usbtmc_device);
 102 }
 103
 104 static GSList *dev_list(void)
 105 {
 106         return ((struct drv_context *)(di->priv))->instances;
 107 }
 108
 109 static void clear_helper(void *priv)
 110 {
 111         struct dev_context *devc;
 112
 113         devc = priv;
 114
 115         dlm_scope_state_destroy(devc->model_state);
 116
 117         g_free(devc->analog_groups);
 118         g_free(devc->digital_groups);
 119         g_free(devc);
 120 }
 121
 122 static int dev_clear(void)
 123 {
 124         return std_dev_clear(di, clear_helper);
 125 }
 126
 127 static int dev_open(struct sr_dev_inst *sdi)
 128 {
 129         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 130                 return SR_ERR;
 131
 132         if (dlm_scope_state_query(sdi) != SR_OK)
 133                 return SR_ERR;
 134
 135         sdi->status = SR_ST_ACTIVE;
 136
 137         return SR_OK;
 138 }
 139
 140 static int dev_close(struct sr_dev_inst *sdi)
 141 {
 142         if (sdi->status == SR_ST_INACTIVE)
 143                 return SR_OK;
 144
 145         sr_scpi_close(sdi->conn);
 146
 147         sdi->status = SR_ST_INACTIVE;
 148
 149         return SR_OK;
 150 }
 151
 152 static int cleanup(void)
 153 {
 154         dev_clear();
 155
 156         return SR_OK;
 157 }
 158
 159 /**
 160  * Check which category a given channel group belongs to.
 161  *
 162  * @param devc Our internal device context.
 163  * @param cg   The channel group to check.
 164  *
 165  * @retval CG_NONE    cg is NULL
 166  * @retval CG_ANALOG  cg is an analog group
 167  * @retval CG_DIGITAL cg is a digital group
 168  * @retval CG_INVALID cg is something else
 169  */
 170 static int check_channel_group(struct dev_context *devc,
 171                              const struct sr_channel_group *cg)
 172 {
 173         unsigned int i;
 174         struct scope_config *model;
 175
 176         model = devc->model_config;
 177
 178         if (!cg)
 179                 return CG_NONE;
 180
 181         for (i = 0; i < model->analog_channels; ++i)
 182                 if (cg == devc->analog_groups[i])
 183                         return CG_ANALOG;
 184
 185         for (i = 0; i < model->pods; ++i)
 186                 if (cg == devc->digital_groups[i])
 187                         return CG_DIGITAL;
 188
 189         sr_err("Invalid channel group specified.");
 190         return CG_INVALID;
 191 }
 192
 193 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 194                       const struct sr_channel_group *cg)
 195 {
 196         int ret, cg_type;
 197         unsigned int i;
 198         struct dev_context *devc;
 199         struct scope_config *model;
 200         struct scope_state *state;
 201
 202         if (!sdi || !(devc = sdi->priv))
 203                 return SR_ERR_ARG;
 204
 205         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 206                 return SR_ERR;
 207
 208         ret = SR_ERR_NA;
 209         model = devc->model_config;
 210         state = devc->model_state;
 211
 212         switch (key) {
 213         case SR_CONF_NUM_TIMEBASE:
 214                 *data = g_variant_new_int32(model->num_xdivs);
 215                 ret = SR_OK;
 216                 break;
 217         case SR_CONF_TIMEBASE:
 218                 *data = g_variant_new("(tt)",
 219                                       (*model->timebases)[state->timebase][0],
 220                                       (*model->timebases)[state->timebase][1]);
 221                 ret = SR_OK;
 222                 break;
 223         case SR_CONF_NUM_VDIV:
 224                 if (cg_type == CG_NONE) {
 225                         sr_err("No channel group specified.");
 226                         return SR_ERR_CHANNEL_GROUP;
 227                 } else if (cg_type == CG_ANALOG) {
 228                                 *data = g_variant_new_int32(model->num_ydivs);
 229                                 ret = SR_OK;
 230                                 break;
 231                 } else {
 232                         ret = SR_ERR_NA;
 233                 }
 234                 break;
 235         case SR_CONF_VDIV:
 236                 ret = SR_ERR_NA;
 237                 if (cg_type == CG_NONE) {
 238                         sr_err("No channel group specified.");
 239                         return SR_ERR_CHANNEL_GROUP;
 240                 } else if (cg_type != CG_ANALOG)
 241                         break;
 242
 243                 for (i = 0; i < model->analog_channels; ++i) {
 244                         if (cg != devc->analog_groups[i])
 245                                 continue;
 246                         *data = g_variant_new("(tt)",
 247                                               (*model->vdivs)[state->analog_states[i].vdiv][0],
 248                                               (*model->vdivs)[state->analog_states[i].vdiv][1]);
 249                         ret = SR_OK;
 250                         break;
 251                 }
 252                 break;
 253         case SR_CONF_TRIGGER_SOURCE:
 254                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 255                 ret = SR_OK;
 256                 break;
 257         case SR_CONF_TRIGGER_SLOPE:
 258                 *data = g_variant_new_string((*model->trigger_slopes)[state->trigger_slope]);
 259                 ret = SR_OK;
 260                 break;
 261         case SR_CONF_HORIZ_TRIGGERPOS:
 262                 *data = g_variant_new_double(state->horiz_triggerpos);
 263                 ret = SR_OK;
 264                 break;
 265         case SR_CONF_COUPLING:
 266                 ret = SR_ERR_NA;
 267                 if (cg_type == CG_NONE) {
 268                         sr_err("No channel group specified.");
 269                         return SR_ERR_CHANNEL_GROUP;
 270                 } else if (cg_type != CG_ANALOG)
 271                         break;
 272
 273                 for (i = 0; i < model->analog_channels; ++i) {
 274                         if (cg != devc->analog_groups[i])
 275                                 continue;
 276                         *data = g_variant_new_string((*model->coupling_options)[state->analog_states[i].coupling]);
 277                         ret = SR_OK;
 278                         break;
 279                 }
 280                 break;
 281         case SR_CONF_SAMPLERATE:
 282                 *data = g_variant_new_uint64(state->sample_rate);
 283                 ret = SR_OK;
 284                 break;
 285         default:
 286                 ret = SR_ERR_NA;
 287         }
 288
 289         return ret;
 290 }
 291
 292 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 293 {
 294         unsigned int i;
 295         GVariant *rational[2];
 296         GVariantBuilder gvb;
 297
 298         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 299
 300         for (i = 0; i < n; i++) {
 301                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 302                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 303
 304                 /* FIXME: Valgrind reports a memory leak here. */
 305                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 306         }
 307
 308         return g_variant_builder_end(&gvb);
 309 }
 310
 311 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 312                       const struct sr_channel_group *cg)
 313 {
 314         int ret, cg_type;
 315         unsigned int i, j;
 316         char float_str[30];
 317         struct dev_context *devc;
 318         struct scope_config *model;
 319         struct scope_state *state;
 320         const char *tmp;
 321         uint64_t p, q;
 322         double tmp_d;
 323         gboolean update_sample_rate;
 324
 325         if (!sdi || !(devc = sdi->priv))
 326                 return SR_ERR_ARG;
 327
 328         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 329                 return SR_ERR;
 330
 331         model = devc->model_config;
 332         state = devc->model_state;
 333         update_sample_rate = FALSE;
 334
 335         ret = SR_ERR_NA;
 336
 337         switch (key) {
 338         case SR_CONF_LIMIT_FRAMES:
 339                 devc->frame_limit = g_variant_get_uint64(data);
 340                 ret = SR_OK;
 341                 break;
 342         case SR_CONF_TRIGGER_SOURCE:
 343                 tmp = g_variant_get_string(data, NULL);
 344                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 345                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 346                                 continue;
 347                         state->trigger_source = i;
 348                         /* TODO: A and B trigger support possible? */
 349                         ret = dlm_trigger_source_set(sdi->conn, (*model->trigger_sources)[i]);
 350                         break;
 351                 }
 352                 break;
 353         case SR_CONF_VDIV:
 354                 if (cg_type == CG_NONE) {
 355                         sr_err("No channel group specified.");
 356                         return SR_ERR_CHANNEL_GROUP;
 357                 }
 358
 359                 g_variant_get(data, "(tt)", &p, &q);
 360
 361                 for (i = 0; i < model->num_vdivs; i++) {
 362                         if (p != (*model->vdivs)[i][0] ||
 363                             q != (*model->vdivs)[i][1])
 364                                 continue;
 365                         for (j = 1; j <= model->analog_channels; ++j) {
 366                                 if (cg != devc->analog_groups[j - 1])
 367                                         continue;
 368                                 state->analog_states[j - 1].vdiv = i;
 369                                 g_ascii_formatd(float_str, sizeof(float_str),
 370                                                 "%E", (float) p / q);
 371                                 if (dlm_analog_chan_vdiv_set(sdi->conn, j, float_str) != SR_OK ||
 372                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 373                                         return SR_ERR;
 374
 375                                 break;
 376                         }
 377
 378                         ret = SR_OK;
 379                         break;
 380                 }
 381                 break;
 382         case SR_CONF_TIMEBASE:
 383                 g_variant_get(data, "(tt)", &p, &q);
 384
 385                 for (i = 0; i < model->num_timebases; i++) {
 386                         if (p != (*model->timebases)[i][0] ||
 387                             q != (*model->timebases)[i][1])
 388                                 continue;
 389                         state->timebase = i;
 390                         g_ascii_formatd(float_str, sizeof(float_str),
 391                                         "%E", (float) p / q);
 392                         ret = dlm_timebase_set(sdi->conn, float_str);
 393                         update_sample_rate = TRUE;
 394                         break;
 395                 }
 396                 break;
 397         case SR_CONF_HORIZ_TRIGGERPOS:
 398                 tmp_d = g_variant_get_double(data);
 399
 400                 /* TODO: Check if the calculation makes sense for the DLM. */
 401                 if (tmp_d < 0.0 || tmp_d > 1.0)
 402                         return SR_ERR;
 403
 404                 state->horiz_triggerpos = tmp_d;
 405                 tmp_d = -(tmp_d - 0.5) *
 406                         ((double) (*model->timebases)[state->timebase][0] /
 407                         (*model->timebases)[state->timebase][1])
 408                          * model->num_xdivs;
 409
 410                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 411                 ret = dlm_horiz_trigger_pos_set(sdi->conn, float_str);
 412                 break;
 413         case SR_CONF_TRIGGER_SLOPE:
 414                 tmp = g_variant_get_string(data, NULL);
 415
 416                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 417                         return SR_ERR_ARG;
 418
 419                 /* Note: See dlm_trigger_slopes[] in protocol.c. */
 420                 state->trigger_slope = (tmp[0] == 'r') ?
 421                                 SLOPE_POSITIVE : SLOPE_NEGATIVE;
 422
 423                 ret = dlm_trigger_slope_set(sdi->conn, state->trigger_slope);
 424                 break;
 425         case SR_CONF_COUPLING:
 426                 if (cg_type == CG_NONE) {
 427                         sr_err("No channel group specified.");
 428                         return SR_ERR_CHANNEL_GROUP;
 429                 }
 430
 431                 tmp = g_variant_get_string(data, NULL);
 432
 433                 for (i = 0; (*model->coupling_options)[i]; i++) {
 434                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 435                                 continue;
 436                         for (j = 1; j <= model->analog_channels; ++j) {
 437                                 if (cg != devc->analog_groups[j - 1])
 438                                         continue;
 439                                 state->analog_states[j-1].coupling = i;
 440
 441                                 if (dlm_analog_chan_coupl_set(sdi->conn, j, tmp) != SR_OK ||
 442                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 443                                         return SR_ERR;
 444                                 break;
 445                         }
 446
 447                         ret = SR_OK;
 448                         break;
 449                 }
 450                 break;
 451         default:
 452                 ret = SR_ERR_NA;
 453                 break;
 454         }
 455
 456         if (ret == SR_OK)
 457                 ret = sr_scpi_get_opc(sdi->conn);
 458
 459         if (ret == SR_OK && update_sample_rate)
 460                 ret = dlm_sample_rate_query(sdi);
 461
 462         return ret;
 463 }
 464
 465 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 466                        const struct sr_channel_group *cg)
 467 {
 468         int cg_type;
 469         struct dev_context *devc;
 470         struct scope_config *model;
 471
 472         if (!sdi || !(devc = sdi->priv))
 473                 return SR_ERR_ARG;
 474
 475         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 476                 return SR_ERR;
 477
 478         model = devc->model_config;
 479
 480         switch (key) {
 481         case SR_CONF_SCAN_OPTIONS:
 482                 *data = NULL;
 483                 break;
 484         case SR_CONF_DEVICE_OPTIONS:
 485                 if (cg_type == CG_NONE) {
 486                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 487                                 model->hw_caps, model->num_hwcaps, sizeof(int32_t));
 488                 } else if (cg_type == CG_ANALOG) {
 489                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 490                                 model->analog_hwcaps, model->num_analog_hwcaps, sizeof(int32_t));
 491                 } else {
 492                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 493                                 NULL, 0, sizeof(int32_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_try_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) 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 50ms. */
 678         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
 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 driver",
 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 };