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 <config.h>
  22 #include <stdlib.h>
  23 #include "scpi.h"
  24 #include "protocol.h"
  25
  26 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info;
  27
  28 static const char *MANUFACTURER_ID = "YOKOGAWA";
  29 static const char *MANUFACTURER_NAME = "Yokogawa";
  30
  31 static const uint32_t dlm_scanopts[] = {
  32         SR_CONF_CONN,
  33 };
  34
  35 static const uint32_t dlm_drvopts[] = {
  36         SR_CONF_LOGIC_ANALYZER,
  37         SR_CONF_OSCILLOSCOPE,
  38 };
  39
  40 static const uint32_t dlm_devopts[] = {
  41         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  42         SR_CONF_SAMPLERATE | SR_CONF_GET,
  43         SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  44         SR_CONF_NUM_HDIV | SR_CONF_GET,
  45         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
  46         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48 };
  49
  50 static const uint32_t dlm_analog_devopts[] = {
  51         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  52         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  53         SR_CONF_NUM_VDIV | SR_CONF_GET,
  54 };
  55
  56 static const uint32_t dlm_digital_devopts[] = {
  57 };
  58
  59 enum {
  60         CG_INVALID = -1,
  61         CG_NONE,
  62         CG_ANALOG,
  63         CG_DIGITAL,
  64 };
  65
  66 static struct sr_dev_inst *probe_usbtmc_device(struct sr_scpi_dev_inst *scpi)
  67 {
  68         struct sr_dev_inst *sdi;
  69         struct dev_context *devc;
  70         struct sr_scpi_hw_info *hw_info;
  71         char *model_name;
  72         int model_index;
  73
  74         sdi = NULL;
  75         devc = NULL;
  76         hw_info = NULL;
  77
  78         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  79                 sr_info("Couldn't get IDN response.");
  80                 goto fail;
  81         }
  82
  83         if (strcmp(hw_info->manufacturer, MANUFACTURER_ID) != 0)
  84                 goto fail;
  85
  86         if (dlm_model_get(hw_info->model, &model_name, &model_index) != SR_OK)
  87                 goto fail;
  88
  89         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  90         sdi->vendor = g_strdup(MANUFACTURER_NAME);
  91         sdi->model = g_strdup(model_name);
  92         sdi->version = g_strdup(hw_info->firmware_version);
  93
  94         sdi->serial_num = g_strdup(hw_info->serial_number);
  95
  96         sr_scpi_hw_info_free(hw_info);
  97         hw_info = NULL;
  98
  99         devc = g_malloc0(sizeof(struct dev_context));
 100
 101         sdi->driver = &yokogawa_dlm_driver_info;
 102         sdi->priv = devc;
 103         sdi->inst_type = SR_INST_SCPI;
 104         sdi->conn = scpi;
 105
 106         if (dlm_device_init(sdi, model_index) != SR_OK)
 107                 goto fail;
 108
 109         return sdi;
 110
 111 fail:
 112         if (hw_info)
 113                 sr_scpi_hw_info_free(hw_info);
 114         if (sdi)
 115                 sr_dev_inst_free(sdi);
 116         g_free(devc);
 117
 118         return NULL;
 119 }
 120
 121 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 122 {
 123         return sr_scpi_scan(di->context, options, probe_usbtmc_device);
 124 }
 125
 126 static void clear_helper(void *priv)
 127 {
 128         struct dev_context *devc;
 129
 130         devc = priv;
 131
 132         dlm_scope_state_destroy(devc->model_state);
 133
 134         g_free(devc->analog_groups);
 135         g_free(devc->digital_groups);
 136         g_free(devc);
 137 }
 138
 139 static int dev_clear(const struct sr_dev_driver *di)
 140 {
 141         return std_dev_clear(di, clear_helper);
 142 }
 143
 144 static int dev_open(struct sr_dev_inst *sdi)
 145 {
 146         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 147                 return SR_ERR;
 148
 149         if (dlm_scope_state_query(sdi) != SR_OK)
 150                 return SR_ERR;
 151
 152         sdi->status = SR_ST_ACTIVE;
 153
 154         return SR_OK;
 155 }
 156
 157 static int dev_close(struct sr_dev_inst *sdi)
 158 {
 159         if (sdi->status == SR_ST_INACTIVE)
 160                 return SR_OK;
 161
 162         sr_scpi_close(sdi->conn);
 163
 164         sdi->status = SR_ST_INACTIVE;
 165
 166         return SR_OK;
 167 }
 168
 169 /**
 170  * Check which category a given channel group belongs to.
 171  *
 172  * @param devc Our internal device context.
 173  * @param cg The channel group to check.
 174  *
 175  * @retval CG_NONE cg is NULL
 176  * @retval CG_ANALOG cg is an analog group
 177  * @retval CG_DIGITAL cg is a digital group
 178  * @retval CG_INVALID cg is something else
 179  */
 180 static int check_channel_group(struct dev_context *devc,
 181                         const struct sr_channel_group *cg)
 182 {
 183         unsigned int i;
 184         const struct scope_config *model;
 185
 186         model = devc->model_config;
 187
 188         if (!cg)
 189                 return CG_NONE;
 190
 191         for (i = 0; i < model->analog_channels; i++)
 192                 if (cg == devc->analog_groups[i])
 193                         return CG_ANALOG;
 194
 195         for (i = 0; i < model->pods; i++)
 196                 if (cg == devc->digital_groups[i])
 197                         return CG_DIGITAL;
 198
 199         sr_err("Invalid channel group specified.");
 200         return CG_INVALID;
 201 }
 202
 203 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 204                 const struct sr_channel_group *cg)
 205 {
 206         int ret, cg_type;
 207         unsigned int i;
 208         struct dev_context *devc;
 209         const struct scope_config *model;
 210         struct scope_state *state;
 211
 212         if (!sdi)
 213                 return SR_ERR_ARG;
 214
 215         devc = sdi->priv;
 216
 217         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 218                 return SR_ERR;
 219
 220         model = devc->model_config;
 221         state = devc->model_state;
 222
 223         switch (key) {
 224         case SR_CONF_NUM_HDIV:
 225                 *data = g_variant_new_int32(model->num_xdivs);
 226                 ret = SR_OK;
 227                 break;
 228         case SR_CONF_TIMEBASE:
 229                 *data = g_variant_new("(tt)",
 230                                 dlm_timebases[state->timebase][0],
 231                                 dlm_timebases[state->timebase][1]);
 232                 ret = SR_OK;
 233                 break;
 234         case SR_CONF_NUM_VDIV:
 235                 if (cg_type == CG_NONE) {
 236                         sr_err("No channel group specified.");
 237                         return SR_ERR_CHANNEL_GROUP;
 238                 } else if (cg_type == CG_ANALOG) {
 239                                 *data = g_variant_new_int32(model->num_ydivs);
 240                                 ret = SR_OK;
 241                                 break;
 242                 } else {
 243                         ret = SR_ERR_NA;
 244                 }
 245                 break;
 246         case SR_CONF_VDIV:
 247                 ret = SR_ERR_NA;
 248                 if (cg_type == CG_NONE) {
 249                         sr_err("No channel group specified.");
 250                         return SR_ERR_CHANNEL_GROUP;
 251                 } else if (cg_type != CG_ANALOG)
 252                         break;
 253
 254                 for (i = 0; i < model->analog_channels; i++) {
 255                         if (cg != devc->analog_groups[i])
 256                                 continue;
 257                         *data = g_variant_new("(tt)",
 258                                         dlm_vdivs[state->analog_states[i].vdiv][0],
 259                                         dlm_vdivs[state->analog_states[i].vdiv][1]);
 260                         ret = SR_OK;
 261                         break;
 262                 }
 263                 break;
 264         case SR_CONF_TRIGGER_SOURCE:
 265                 *data = g_variant_new_string((*model->trigger_sources)[state->trigger_source]);
 266                 ret = SR_OK;
 267                 break;
 268         case SR_CONF_TRIGGER_SLOPE:
 269                 *data = g_variant_new_string(dlm_trigger_slopes[state->trigger_slope]);
 270                 ret = SR_OK;
 271                 break;
 272         case SR_CONF_HORIZ_TRIGGERPOS:
 273                 *data = g_variant_new_double(state->horiz_triggerpos);
 274                 ret = SR_OK;
 275                 break;
 276         case SR_CONF_COUPLING:
 277                 ret = SR_ERR_NA;
 278                 if (cg_type == CG_NONE) {
 279                         sr_err("No channel group specified.");
 280                         return SR_ERR_CHANNEL_GROUP;
 281                 } else if (cg_type != CG_ANALOG)
 282                         break;
 283
 284                 for (i = 0; i < model->analog_channels; i++) {
 285                         if (cg != devc->analog_groups[i])
 286                                 continue;
 287                         *data = g_variant_new_string((*model->coupling_options)[state->analog_states[i].coupling]);
 288                         ret = SR_OK;
 289                         break;
 290                 }
 291                 break;
 292         case SR_CONF_SAMPLERATE:
 293                 *data = g_variant_new_uint64(state->sample_rate);
 294                 ret = SR_OK;
 295                 break;
 296         default:
 297                 ret = SR_ERR_NA;
 298         }
 299
 300         return ret;
 301 }
 302
 303 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 304 {
 305         unsigned int i;
 306         GVariant *rational[2];
 307         GVariantBuilder gvb;
 308
 309         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 310
 311         for (i = 0; i < n; i++) {
 312                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 313                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 314
 315                 /* FIXME: Valgrind reports a memory leak here. */
 316                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 317         }
 318
 319         return g_variant_builder_end(&gvb);
 320 }
 321
 322 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 323                 const struct sr_channel_group *cg)
 324 {
 325         int ret, cg_type;
 326         unsigned int i, j;
 327         char float_str[30];
 328         struct dev_context *devc;
 329         const struct scope_config *model;
 330         struct scope_state *state;
 331         const char *tmp;
 332         uint64_t p, q;
 333         double tmp_d;
 334         gboolean update_sample_rate;
 335
 336         if (!sdi || !(devc = sdi->priv))
 337                 return SR_ERR_ARG;
 338
 339         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 340                 return SR_ERR;
 341
 342         model = devc->model_config;
 343         state = devc->model_state;
 344         update_sample_rate = FALSE;
 345
 346         ret = SR_ERR_NA;
 347
 348         switch (key) {
 349         case SR_CONF_LIMIT_FRAMES:
 350                 devc->frame_limit = g_variant_get_uint64(data);
 351                 ret = SR_OK;
 352                 break;
 353         case SR_CONF_TRIGGER_SOURCE:
 354                 tmp = g_variant_get_string(data, NULL);
 355                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 356                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 357                                 continue;
 358                         state->trigger_source = i;
 359                         /* TODO: A and B trigger support possible? */
 360                         ret = dlm_trigger_source_set(sdi->conn, (*model->trigger_sources)[i]);
 361                         break;
 362                 }
 363                 break;
 364         case SR_CONF_VDIV:
 365                 if (cg_type == CG_NONE) {
 366                         sr_err("No channel group specified.");
 367                         return SR_ERR_CHANNEL_GROUP;
 368                 }
 369
 370                 g_variant_get(data, "(tt)", &p, &q);
 371
 372                 for (i = 0; i < ARRAY_SIZE(dlm_vdivs); i++) {
 373                         if (p != dlm_vdivs[i][0] ||
 374                                         q != dlm_vdivs[i][1])
 375                                 continue;
 376                         for (j = 1; j <= model->analog_channels; j++) {
 377                                 if (cg != devc->analog_groups[j - 1])
 378                                         continue;
 379                                 state->analog_states[j - 1].vdiv = i;
 380                                 g_ascii_formatd(float_str, sizeof(float_str),
 381                                                 "%E", (float) p / q);
 382                                 if (dlm_analog_chan_vdiv_set(sdi->conn, j, float_str) != SR_OK ||
 383                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 384                                         return SR_ERR;
 385
 386                                 break;
 387                         }
 388
 389                         ret = SR_OK;
 390                         break;
 391                 }
 392                 break;
 393         case SR_CONF_TIMEBASE:
 394                 g_variant_get(data, "(tt)", &p, &q);
 395
 396                 for (i = 0; i < ARRAY_SIZE(dlm_timebases); i++) {
 397                         if (p != dlm_timebases[i][0] ||
 398                                         q != dlm_timebases[i][1])
 399                                 continue;
 400                         state->timebase = i;
 401                         g_ascii_formatd(float_str, sizeof(float_str),
 402                                         "%E", (float) p / q);
 403                         ret = dlm_timebase_set(sdi->conn, float_str);
 404                         update_sample_rate = TRUE;
 405                         break;
 406                 }
 407                 break;
 408         case SR_CONF_HORIZ_TRIGGERPOS:
 409                 tmp_d = g_variant_get_double(data);
 410
 411                 /* TODO: Check if the calculation makes sense for the DLM. */
 412                 if (tmp_d < 0.0 || tmp_d > 1.0)
 413                         return SR_ERR;
 414
 415                 state->horiz_triggerpos = tmp_d;
 416                 tmp_d = -(tmp_d - 0.5) *
 417                                 ((double) dlm_timebases[state->timebase][0] /
 418                                 dlm_timebases[state->timebase][1])
 419                                 * model->num_xdivs;
 420
 421                 g_ascii_formatd(float_str, sizeof(float_str), "%E", tmp_d);
 422                 ret = dlm_horiz_trigger_pos_set(sdi->conn, float_str);
 423                 break;
 424         case SR_CONF_TRIGGER_SLOPE:
 425                 tmp = g_variant_get_string(data, NULL);
 426
 427                 if (!tmp || !(tmp[0] == 'f' || tmp[0] == 'r'))
 428                         return SR_ERR_ARG;
 429
 430                 /* Note: See dlm_trigger_slopes[] in protocol.c. */
 431                 state->trigger_slope = (tmp[0] == 'r') ?
 432                                 SLOPE_POSITIVE : SLOPE_NEGATIVE;
 433
 434                 ret = dlm_trigger_slope_set(sdi->conn, state->trigger_slope);
 435                 break;
 436         case SR_CONF_COUPLING:
 437                 if (cg_type == CG_NONE) {
 438                         sr_err("No channel group specified.");
 439                         return SR_ERR_CHANNEL_GROUP;
 440                 }
 441
 442                 tmp = g_variant_get_string(data, NULL);
 443
 444                 for (i = 0; (*model->coupling_options)[i]; i++) {
 445                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 446                                 continue;
 447                         for (j = 1; j <= model->analog_channels; j++) {
 448                                 if (cg != devc->analog_groups[j - 1])
 449                                         continue;
 450                                 state->analog_states[j-1].coupling = i;
 451
 452                                 if (dlm_analog_chan_coupl_set(sdi->conn, j, tmp) != SR_OK ||
 453                                                 sr_scpi_get_opc(sdi->conn) != SR_OK)
 454                                         return SR_ERR;
 455                                 break;
 456                         }
 457
 458                         ret = SR_OK;
 459                         break;
 460                 }
 461                 break;
 462         default:
 463                 ret = SR_ERR_NA;
 464                 break;
 465         }
 466
 467         if (ret == SR_OK)
 468                 ret = sr_scpi_get_opc(sdi->conn);
 469
 470         if (ret == SR_OK && update_sample_rate)
 471                 ret = dlm_sample_rate_query(sdi);
 472
 473         return ret;
 474 }
 475
 476 static int config_channel_set(const struct sr_dev_inst *sdi,
 477                         struct sr_channel *ch, unsigned int changes)
 478 {
 479         /* Currently we only handle SR_CHANNEL_SET_ENABLED. */
 480         if (changes != SR_CHANNEL_SET_ENABLED)
 481                 return SR_ERR_NA;
 482
 483         return dlm_channel_state_set(sdi, ch->index, ch->enabled);
 484 }
 485
 486 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 487                 const struct sr_channel_group *cg)
 488 {
 489         int cg_type = CG_NONE;
 490         struct dev_context *devc = NULL;
 491         const struct scope_config *model = NULL;
 492
 493         /* SR_CONF_SCAN_OPTIONS is always valid, regardless of sdi or probe group. */
 494         if (key == SR_CONF_SCAN_OPTIONS) {
 495                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 496                                 dlm_scanopts, ARRAY_SIZE(dlm_scanopts), sizeof(uint32_t));
 497                 return SR_OK;
 498         }
 499
 500         /* If sdi is NULL, nothing except SR_CONF_DEVICE_OPTIONS can be provided. */
 501         if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 502                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 503                                 dlm_drvopts, ARRAY_SIZE(dlm_drvopts), sizeof(uint32_t));
 504                 return SR_OK;
 505         }
 506
 507         if (!sdi)
 508                 return SR_ERR_ARG;
 509
 510         devc = sdi->priv;
 511         model = devc->model_config;
 512
 513         /*
 514          * If cg is NULL, only the SR_CONF_DEVICE_OPTIONS that are not
 515          * specific to a probe group must be returned.
 516          */
 517         if (!cg) {
 518                 switch (key) {
 519                 case SR_CONF_DEVICE_OPTIONS:
 520                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 521                                         dlm_devopts, ARRAY_SIZE(dlm_devopts), sizeof(uint32_t));
 522                         return SR_OK;
 523                 case SR_CONF_TIMEBASE:
 524                         *data = build_tuples(&dlm_timebases, ARRAY_SIZE(dlm_timebases));
 525                         return SR_OK;
 526                 case SR_CONF_TRIGGER_SOURCE:
 527                         if (!model)
 528                                 return SR_ERR_ARG;
 529                         *data = g_variant_new_strv(*model->trigger_sources,
 530                                         g_strv_length((char **)*model->trigger_sources));
 531                         return SR_OK;
 532                 case SR_CONF_TRIGGER_SLOPE:
 533                         *data = g_variant_new_strv(dlm_trigger_slopes,
 534                                         g_strv_length((char **)dlm_trigger_slopes));
 535                         return SR_OK;
 536                 case SR_CONF_NUM_HDIV:
 537                         *data = g_variant_new_uint32(model->num_xdivs);
 538                         return SR_OK;
 539                 default:
 540                         return SR_ERR_NA;
 541                 }
 542         }
 543
 544         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 545                 return SR_ERR;
 546
 547         switch (key) {
 548         case SR_CONF_DEVICE_OPTIONS:
 549                 if (cg_type == CG_ANALOG) {
 550                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 551                                 dlm_analog_devopts, ARRAY_SIZE(dlm_analog_devopts), sizeof(uint32_t));
 552                 } else if (cg_type == CG_DIGITAL) {
 553                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 554                                 dlm_digital_devopts, ARRAY_SIZE(dlm_digital_devopts), sizeof(uint32_t));
 555                 } else {
 556                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 557                                 NULL, 0, sizeof(uint32_t));
 558                 }
 559                 break;
 560         case SR_CONF_COUPLING:
 561                 if (cg_type == CG_NONE)
 562                         return SR_ERR_CHANNEL_GROUP;
 563                 *data = g_variant_new_strv(*model->coupling_options,
 564                                 g_strv_length((char **)*model->coupling_options));
 565                 break;
 566         case SR_CONF_VDIV:
 567                 if (cg_type == CG_NONE)
 568                         return SR_ERR_CHANNEL_GROUP;
 569                 *data = build_tuples(&dlm_vdivs, ARRAY_SIZE(dlm_vdivs));
 570                 break;
 571         default:
 572                 return SR_ERR_NA;
 573         }
 574
 575         return SR_OK;
 576 }
 577
 578 static int dlm_check_channels(GSList *channels)
 579 {
 580         GSList *l;
 581         struct sr_channel *ch;
 582         gboolean enabled_pod1, enabled_chan4;
 583
 584         enabled_pod1 = enabled_chan4 = FALSE;
 585
 586         /* Note: On the DLM2000, CH4 and Logic are shared. */
 587         /* TODO Handle non-DLM2000 models. */
 588         for (l = channels; l; l = l->next) {
 589                 ch = l->data;
 590                 switch (ch->type) {
 591                 case SR_CHANNEL_ANALOG:
 592                         if (ch->index == 3)
 593                                 enabled_chan4 = TRUE;
 594                         break;
 595                 case SR_CHANNEL_LOGIC:
 596                         enabled_pod1 = TRUE;
 597                         break;
 598                 default:
 599                         return SR_ERR;
 600                 }
 601         }
 602
 603         if (enabled_pod1 && enabled_chan4)
 604                 return SR_ERR;
 605
 606         return SR_OK;
 607 }
 608
 609 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 610 {
 611         GSList *l;
 612         gboolean digital_added;
 613         struct sr_channel *ch;
 614         struct dev_context *devc;
 615         struct sr_scpi_dev_inst *scpi;
 616
 617         if (sdi->status != SR_ST_ACTIVE)
 618                 return SR_ERR_DEV_CLOSED;
 619
 620         scpi = sdi->conn;
 621         devc = sdi->priv;
 622         digital_added = FALSE;
 623
 624         g_slist_free(devc->enabled_channels);
 625         devc->enabled_channels = NULL;
 626
 627         for (l = sdi->channels; l; l = l->next) {
 628                 ch = l->data;
 629                 if (!ch->enabled)
 630                         continue;
 631                 /* Only add a single digital channel. */
 632                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 633                         devc->enabled_channels = g_slist_append(
 634                                 devc->enabled_channels, ch);
 635                         if (ch->type == SR_CHANNEL_LOGIC)
 636                                 digital_added = TRUE;
 637                 }
 638         }
 639
 640         if (!devc->enabled_channels)
 641                 return SR_ERR;
 642
 643         if (dlm_check_channels(devc->enabled_channels) != SR_OK) {
 644                 sr_err("Invalid channel configuration specified!");
 645                 return SR_ERR_NA;
 646         }
 647
 648         /* Request data for the first enabled channel. */
 649         devc->current_channel = devc->enabled_channels;
 650         dlm_channel_data_request(sdi);
 651
 652         /* Call our callback when data comes in or after 5ms. */
 653         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 5,
 654                         dlm_data_receive, (void *)sdi);
 655
 656         return SR_OK;
 657 }
 658
 659 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 660 {
 661         struct dev_context *devc;
 662
 663         std_session_send_df_end(sdi, LOG_PREFIX);
 664
 665         if (sdi->status != SR_ST_ACTIVE)
 666                 return SR_ERR_DEV_CLOSED;
 667
 668         devc = sdi->priv;
 669
 670         devc->num_frames = 0;
 671         g_slist_free(devc->enabled_channels);
 672         devc->enabled_channels = NULL;
 673
 674         sr_scpi_source_remove(sdi->session, sdi->conn);
 675
 676         return SR_OK;
 677 }
 678
 679 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info = {
 680         .name = "yokogawa-dlm",
 681         .longname = "Yokogawa DL/DLM",
 682         .api_version = 1,
 683         .init = std_init,
 684         .cleanup = std_cleanup,
 685         .scan = scan,
 686         .dev_list = std_dev_list,
 687         .dev_clear = dev_clear,
 688         .config_get = config_get,
 689         .config_set = config_set,
 690         .config_channel_set = config_channel_set,
 691         .config_list = config_list,
 692         .dev_open = dev_open,
 693         .dev_close = dev_close,
 694         .dev_acquisition_start = dev_acquisition_start,
 695         .dev_acquisition_stop = dev_acquisition_stop,
 696         .context = NULL,
 697 };