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