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 static 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_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48 };
  49
  50 static const uint32_t dlm_analog_devopts[] = {
  51         SR_CONF_NUM_VDIV | SR_CONF_GET,
  52         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  53         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  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         sr_scpi_hw_info_free(hw_info);
 113         sr_dev_inst_free(sdi);
 114         g_free(devc);
 115
 116         return NULL;
 117 }
 118
 119 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 120 {
 121         return sr_scpi_scan(di->context, options, probe_usbtmc_device);
 122 }
 123
 124 static void clear_helper(void *priv)
 125 {
 126         struct dev_context *devc;
 127
 128         devc = priv;
 129
 130         dlm_scope_state_destroy(devc->model_state);
 131
 132         g_free(devc->analog_groups);
 133         g_free(devc->digital_groups);
 134         g_free(devc);
 135 }
 136
 137 static int dev_clear(const struct sr_dev_driver *di)
 138 {
 139         return std_dev_clear(di, clear_helper);
 140 }
 141
 142 static int dev_open(struct sr_dev_inst *sdi)
 143 {
 144         if (sr_scpi_open(sdi->conn) != SR_OK)
 145                 return SR_ERR;
 146
 147         if (dlm_scope_state_query(sdi) != SR_OK)
 148                 return SR_ERR;
 149
 150         return SR_OK;
 151 }
 152
 153 static int dev_close(struct sr_dev_inst *sdi)
 154 {
 155         return sr_scpi_close(sdi->conn);
 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         const 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         const struct scope_config *model;
 199         struct scope_state *state;
 200
 201         if (!sdi)
 202                 return SR_ERR_ARG;
 203
 204         devc = sdi->priv;
 205
 206         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 207                 return SR_ERR;
 208
 209         model = devc->model_config;
 210         state = devc->model_state;
 211
 212         switch (key) {
 213         case SR_CONF_NUM_HDIV:
 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                                 dlm_timebases[state->timebase][0],
 220                                 dlm_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                                         dlm_vdivs[state->analog_states[i].vdiv][0],
 248                                         dlm_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(dlm_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(uint32_t 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         const 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 < ARRAY_SIZE(dlm_vdivs); i++) {
 362                         if (p != dlm_vdivs[i][0] ||
 363                                         q != dlm_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 < ARRAY_SIZE(dlm_timebases); i++) {
 386                         if (p != dlm_timebases[i][0] ||
 387                                         q != dlm_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) dlm_timebases[state->timebase][0] /
 407                                 dlm_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_channel_set(const struct sr_dev_inst *sdi,
 466                         struct sr_channel *ch, unsigned int changes)
 467 {
 468         /* Currently we only handle SR_CHANNEL_SET_ENABLED. */
 469         if (changes != SR_CHANNEL_SET_ENABLED)
 470                 return SR_ERR_NA;
 471
 472         return dlm_channel_state_set(sdi, ch->index, ch->enabled);
 473 }
 474
 475 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 476                 const struct sr_channel_group *cg)
 477 {
 478         int cg_type = CG_NONE;
 479         struct dev_context *devc = NULL;
 480         const struct scope_config *model = NULL;
 481
 482         /* SR_CONF_SCAN_OPTIONS is always valid, regardless of sdi or channel group. */
 483         if (key == SR_CONF_SCAN_OPTIONS) {
 484                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 485                                 dlm_scanopts, ARRAY_SIZE(dlm_scanopts), sizeof(uint32_t));
 486                 return SR_OK;
 487         }
 488
 489         /* If sdi is NULL, nothing except SR_CONF_DEVICE_OPTIONS can be provided. */
 490         if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 491                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 492                                 dlm_drvopts, ARRAY_SIZE(dlm_drvopts), sizeof(uint32_t));
 493                 return SR_OK;
 494         }
 495
 496         if (!sdi)
 497                 return SR_ERR_ARG;
 498
 499         devc = sdi->priv;
 500         model = devc->model_config;
 501
 502         /*
 503          * If cg is NULL, only the SR_CONF_DEVICE_OPTIONS that are not
 504          * specific to a channel group must be returned.
 505          */
 506         if (!cg) {
 507                 switch (key) {
 508                 case SR_CONF_DEVICE_OPTIONS:
 509                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 510                                         dlm_devopts, ARRAY_SIZE(dlm_devopts), sizeof(uint32_t));
 511                         return SR_OK;
 512                 case SR_CONF_TIMEBASE:
 513                         *data = build_tuples(&dlm_timebases, ARRAY_SIZE(dlm_timebases));
 514                         return SR_OK;
 515                 case SR_CONF_TRIGGER_SOURCE:
 516                         if (!model)
 517                                 return SR_ERR_ARG;
 518                         *data = g_variant_new_strv(*model->trigger_sources,
 519                                         g_strv_length((char **)*model->trigger_sources));
 520                         return SR_OK;
 521                 case SR_CONF_TRIGGER_SLOPE:
 522                         *data = g_variant_new_strv(dlm_trigger_slopes,
 523                                         g_strv_length((char **)dlm_trigger_slopes));
 524                         return SR_OK;
 525                 case SR_CONF_NUM_HDIV:
 526                         *data = g_variant_new_uint32(model->num_xdivs);
 527                         return SR_OK;
 528                 default:
 529                         return SR_ERR_NA;
 530                 }
 531         }
 532
 533         if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
 534                 return SR_ERR;
 535
 536         switch (key) {
 537         case SR_CONF_DEVICE_OPTIONS:
 538                 if (cg_type == CG_ANALOG) {
 539                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 540                                 dlm_analog_devopts, ARRAY_SIZE(dlm_analog_devopts), sizeof(uint32_t));
 541                 } else if (cg_type == CG_DIGITAL) {
 542                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 543                                 dlm_digital_devopts, ARRAY_SIZE(dlm_digital_devopts), sizeof(uint32_t));
 544                 } else {
 545                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 546                                 NULL, 0, sizeof(uint32_t));
 547                 }
 548                 break;
 549         case SR_CONF_COUPLING:
 550                 if (cg_type == CG_NONE)
 551                         return SR_ERR_CHANNEL_GROUP;
 552                 *data = g_variant_new_strv(*model->coupling_options,
 553                                 g_strv_length((char **)*model->coupling_options));
 554                 break;
 555         case SR_CONF_VDIV:
 556                 if (cg_type == CG_NONE)
 557                         return SR_ERR_CHANNEL_GROUP;
 558                 *data = build_tuples(&dlm_vdivs, ARRAY_SIZE(dlm_vdivs));
 559                 break;
 560         default:
 561                 return SR_ERR_NA;
 562         }
 563
 564         return SR_OK;
 565 }
 566
 567 static int dlm_check_channels(GSList *channels)
 568 {
 569         GSList *l;
 570         struct sr_channel *ch;
 571         gboolean enabled_pod1, enabled_chan4;
 572
 573         enabled_pod1 = enabled_chan4 = FALSE;
 574
 575         /* Note: On the DLM2000, CH4 and Logic are shared. */
 576         /* TODO Handle non-DLM2000 models. */
 577         for (l = channels; l; l = l->next) {
 578                 ch = l->data;
 579                 switch (ch->type) {
 580                 case SR_CHANNEL_ANALOG:
 581                         if (ch->index == 3)
 582                                 enabled_chan4 = TRUE;
 583                         break;
 584                 case SR_CHANNEL_LOGIC:
 585                         enabled_pod1 = TRUE;
 586                         break;
 587                 default:
 588                         return SR_ERR;
 589                 }
 590         }
 591
 592         if (enabled_pod1 && enabled_chan4)
 593                 return SR_ERR;
 594
 595         return SR_OK;
 596 }
 597
 598 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 599 {
 600         GSList *l;
 601         gboolean digital_added;
 602         struct sr_channel *ch;
 603         struct dev_context *devc;
 604         struct sr_scpi_dev_inst *scpi;
 605
 606         scpi = sdi->conn;
 607         devc = sdi->priv;
 608         digital_added = FALSE;
 609
 610         g_slist_free(devc->enabled_channels);
 611         devc->enabled_channels = NULL;
 612
 613         for (l = sdi->channels; l; l = l->next) {
 614                 ch = l->data;
 615                 if (!ch->enabled)
 616                         continue;
 617                 /* Only add a single digital channel. */
 618                 if (ch->type != SR_CHANNEL_LOGIC || !digital_added) {
 619                         devc->enabled_channels = g_slist_append(
 620                                 devc->enabled_channels, ch);
 621                         if (ch->type == SR_CHANNEL_LOGIC)
 622                                 digital_added = TRUE;
 623                 }
 624         }
 625
 626         if (!devc->enabled_channels)
 627                 return SR_ERR;
 628
 629         if (dlm_check_channels(devc->enabled_channels) != SR_OK) {
 630                 sr_err("Invalid channel configuration specified!");
 631                 return SR_ERR_NA;
 632         }
 633
 634         /* Request data for the first enabled channel. */
 635         devc->current_channel = devc->enabled_channels;
 636         dlm_channel_data_request(sdi);
 637
 638         /* Call our callback when data comes in or after 5ms. */
 639         sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 5,
 640                         dlm_data_receive, (void *)sdi);
 641
 642         return SR_OK;
 643 }
 644
 645 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 646 {
 647         struct dev_context *devc;
 648
 649         std_session_send_df_end(sdi);
 650
 651         devc = sdi->priv;
 652
 653         devc->num_frames = 0;
 654         g_slist_free(devc->enabled_channels);
 655         devc->enabled_channels = NULL;
 656
 657         sr_scpi_source_remove(sdi->session, sdi->conn);
 658
 659         return SR_OK;
 660 }
 661
 662 static struct sr_dev_driver yokogawa_dlm_driver_info = {
 663         .name = "yokogawa-dlm",
 664         .longname = "Yokogawa DL/DLM",
 665         .api_version = 1,
 666         .init = std_init,
 667         .cleanup = std_cleanup,
 668         .scan = scan,
 669         .dev_list = std_dev_list,
 670         .dev_clear = dev_clear,
 671         .config_get = config_get,
 672         .config_set = config_set,
 673         .config_channel_set = config_channel_set,
 674         .config_list = config_list,
 675         .dev_open = dev_open,
 676         .dev_close = dev_close,
 677         .dev_acquisition_start = dev_acquisition_start,
 678         .dev_acquisition_stop = dev_acquisition_stop,
 679         .context = NULL,
 680 };
 681 SR_REGISTER_DEV_DRIVER(yokogawa_dlm_driver_info);