src/hardware/scpi-pps/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <string.h>
  21 #include "protocol.h"
  22
  23 SR_PRIV struct sr_dev_driver scpi_pps_driver_info;
  24 static struct sr_dev_driver *di = &scpi_pps_driver_info;
  25 extern unsigned int num_pps_profiles;
  26 extern const struct scpi_pps pps_profiles[];
  27
  28 static const uint32_t scanopts[] = {
  29         SR_CONF_CONN,
  30         SR_CONF_SERIALCOMM,
  31 };
  32
  33 static struct pps_channel_instance pci[] = {
  34         { SR_MQ_VOLTAGE, SCPI_CMD_GET_MEAS_VOLTAGE, "V" },
  35         { SR_MQ_CURRENT, SCPI_CMD_GET_MEAS_CURRENT, "I" },
  36         { SR_MQ_POWER, SCPI_CMD_GET_MEAS_POWER, "P" },
  37 };
  38
  39 static int init(struct sr_context *sr_ctx)
  40 {
  41         return std_init(sr_ctx, di, LOG_PREFIX);
  42 }
  43
  44 static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
  45 {
  46         struct dev_context *devc;
  47         struct sr_dev_inst *sdi;
  48         struct sr_scpi_hw_info *hw_info;
  49         struct sr_channel_group *cg;
  50         struct sr_channel *ch;
  51         const struct scpi_pps *device;
  52         struct pps_channel *pch;
  53         struct channel_spec *channels;
  54         struct channel_group_spec *channel_groups, *cgs;
  55         struct pps_channel_group *pcg;
  56         GRegex *model_re;
  57         GMatchInfo *model_mi;
  58         GSList *l;
  59         uint64_t mask;
  60         unsigned int num_channels, num_channel_groups, ch_num, ch_idx, i, j;
  61         int ret;
  62         const char *vendor;
  63         char ch_name[16];
  64
  65         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  66                 sr_info("Couldn't get IDN response.");
  67                 return NULL;
  68         }
  69
  70         device = NULL;
  71         for (i = 0; i < num_pps_profiles; i++) {
  72                 vendor = get_vendor(hw_info->manufacturer);
  73                 if (strcasecmp(vendor, pps_profiles[i].vendor))
  74                         continue;
  75                 model_re = g_regex_new(pps_profiles[i].model, 0, 0, NULL);
  76                 if (g_regex_match(model_re, hw_info->model, 0, &model_mi))
  77                         device = &pps_profiles[i];
  78                 g_match_info_unref(model_mi);
  79                 g_regex_unref(model_re);
  80                 if (device)
  81                         break;
  82         }
  83         if (!device) {
  84                 sr_scpi_hw_info_free(hw_info);
  85                 return NULL;
  86         }
  87
  88         sdi = sr_dev_inst_new(SR_ST_ACTIVE, vendor, hw_info->model,
  89                         hw_info->firmware_version);
  90         sdi->conn = scpi;
  91         sdi->driver = di;
  92         sdi->inst_type = SR_INST_SCPI;
  93         sdi->serial_num = g_strdup(hw_info->serial_number);
  94
  95         devc = g_malloc0(sizeof(struct dev_context));
  96         devc->device = device;
  97         sdi->priv = devc;
  98
  99         if (device->num_channels) {
 100                 /* Static channels and groups. */
 101                 channels = device->channels;
 102                 num_channels = device->num_channels;
 103                 channel_groups = device->channel_groups;
 104                 num_channel_groups = device->num_channel_groups;
 105         } else {
 106                 /* Channels and groups need to be probed. */
 107                 ret = device->probe_channels(sdi, hw_info, &channels, &num_channels,
 108                                 &channel_groups, &num_channel_groups);
 109                 if (ret != SR_OK) {
 110                         sr_err("Failed to probe for channels.");
 111                         return NULL;
 112                 }
 113                 /*
 114                  * Since these were dynamically allocated, we'll need to free them
 115                  * later.
 116                  */
 117                 devc->channels = channels;
 118                 devc->channel_groups = channel_groups;
 119         }
 120
 121         ch_idx = 0;
 122         for (ch_num = 0; ch_num < num_channels; ch_num++) {
 123                 /* Create one channel per measurable output unit. */
 124                 for (i = 0; i < ARRAY_SIZE(pci); i++) {
 125                         if (!scpi_cmd_get(sdi, pci[i].command))
 126                                 continue;
 127                         g_snprintf(ch_name, 16, "%s%s", pci[i].prefix,
 128                                         channels[ch_num].name);
 129                         ch = sr_channel_new(ch_idx++, SR_CHANNEL_ANALOG, TRUE, ch_name);
 130                         pch = g_malloc0(sizeof(struct pps_channel));
 131                         pch->hw_output_idx = ch_num;
 132                         pch->hwname = channels[ch_num].name;
 133                         pch->mq = pci[i].mq;
 134                         ch->priv = pch;
 135                         sdi->channels = g_slist_append(sdi->channels, ch);
 136                 }
 137         }
 138
 139         for (i = 0; i < num_channel_groups; i++) {
 140                 cgs = &channel_groups[i];
 141                 cg = g_malloc0(sizeof(struct sr_channel_group));
 142                 cg->name = g_strdup(cgs->name);
 143                 for (j = 0, mask = 1; j < 64; j++, mask <<= 1) {
 144                         if (cgs->channel_index_mask & mask) {
 145                                 for (l = sdi->channels; l; l = l->next) {
 146                                         ch = l->data;
 147                                         pch = ch->priv;
 148                                         if (pch->hw_output_idx == j)
 149                                                 cg->channels = g_slist_append(cg->channels, ch);
 150                                 }
 151                         }
 152                 }
 153                 pcg = g_malloc0(sizeof(struct pps_channel_group));
 154                 pcg->features = cgs->features;
 155                 cg->priv = pcg;
 156                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 157         }
 158
 159         sr_scpi_hw_info_free(hw_info);
 160         hw_info = NULL;
 161
 162         scpi_cmd(sdi, SCPI_CMD_LOCAL);
 163         sr_scpi_close(scpi);
 164
 165         return sdi;
 166 }
 167
 168 static GSList *scan(GSList *options)
 169 {
 170         return sr_scpi_scan(di->priv, options, probe_device);
 171 }
 172
 173 static GSList *dev_list(void)
 174 {
 175         return ((struct drv_context *)(di->priv))->instances;
 176 }
 177
 178 static int dev_clear(void)
 179 {
 180         return std_dev_clear(di, NULL);
 181 }
 182
 183 static int dev_open(struct sr_dev_inst *sdi)
 184 {
 185         struct dev_context *devc;
 186         struct sr_scpi_dev_inst *scpi;
 187         GVariant *beeper;
 188
 189         if (sdi->status != SR_ST_ACTIVE)
 190                 return SR_ERR;
 191
 192         scpi = sdi->conn;
 193         if (sr_scpi_open(scpi) < 0)
 194                 return SR_ERR;
 195
 196         sdi->status = SR_ST_ACTIVE;
 197
 198         scpi_cmd(sdi, SCPI_CMD_REMOTE);
 199         devc = sdi->priv;
 200         devc->beeper_was_set = FALSE;
 201         if (scpi_cmd_resp(sdi, &beeper, G_VARIANT_TYPE_BOOLEAN, SCPI_CMD_BEEPER) == SR_OK) {
 202                 if (g_variant_get_boolean(beeper)) {
 203                         devc->beeper_was_set = TRUE;
 204                         scpi_cmd(sdi, SCPI_CMD_BEEPER_DISABLE);
 205                 }
 206                 g_variant_unref(beeper);
 207         }
 208
 209         return SR_OK;
 210 }
 211
 212 static int dev_close(struct sr_dev_inst *sdi)
 213 {
 214         struct sr_scpi_dev_inst *scpi;
 215         struct dev_context *devc;
 216
 217         if (sdi->status != SR_ST_ACTIVE)
 218                 return SR_ERR_DEV_CLOSED;
 219
 220         devc = sdi->priv;
 221         scpi = sdi->conn;
 222         if (scpi) {
 223                 if (devc->beeper_was_set)
 224                         scpi_cmd(sdi, SCPI_CMD_BEEPER_ENABLE);
 225                 scpi_cmd(sdi, SCPI_CMD_LOCAL);
 226                 sr_scpi_close(scpi);
 227                 sdi->status = SR_ST_INACTIVE;
 228         }
 229
 230         return SR_OK;
 231 }
 232
 233 static void clear_helper(void *priv)
 234 {
 235         struct dev_context *devc;
 236
 237         devc = priv;
 238         g_free(devc->channels);
 239         g_free(devc->channel_groups);
 240         g_free(devc);
 241 }
 242
 243 static int cleanup(void)
 244 {
 245         return std_dev_clear(di, clear_helper);
 246 }
 247
 248 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 249                 const struct sr_channel_group *cg)
 250 {
 251         struct dev_context *devc;
 252         const GVariantType *gvtype;
 253         unsigned int i;
 254         int cmd, ret;
 255         const char *s;
 256
 257         if (!sdi)
 258                 return SR_ERR_ARG;
 259
 260         devc = sdi->priv;
 261
 262         if (cg) {
 263                 /*
 264                  * These options only apply to channel groups with a single
 265                  * channel -- they're per-channel settings for the device.
 266                  */
 267
 268                 /*
 269                  * Config keys are handled below depending on whether a channel
 270                  * group was provided by the frontend. However some of these
 271                  * take a CG on one PPS but not on others. Check the device's
 272                  * profile for that here, and NULL out the channel group as needed.
 273                  */
 274                 for (i = 0; i < devc->device->num_devopts; i++) {
 275                         if (devc->device->devopts[i] == key) {
 276                                 cg = NULL;
 277                                 break;
 278                         }
 279                 }
 280         }
 281
 282         gvtype = NULL;
 283         cmd = -1;
 284         switch (key) {
 285         case SR_CONF_OUTPUT_ENABLED:
 286                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 287                 cmd = SCPI_CMD_GET_OUTPUT_ENABLED;
 288                 break;
 289         case SR_CONF_OUTPUT_VOLTAGE:
 290                 gvtype = G_VARIANT_TYPE_DOUBLE;
 291                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
 292                 break;
 293         case SR_CONF_OUTPUT_VOLTAGE_TARGET:
 294                 gvtype = G_VARIANT_TYPE_DOUBLE;
 295                 cmd = SCPI_CMD_GET_VOLTAGE_TARGET;
 296                 break;
 297         case SR_CONF_OUTPUT_CURRENT:
 298                 gvtype = G_VARIANT_TYPE_DOUBLE;
 299                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
 300                 break;
 301         case SR_CONF_OUTPUT_CURRENT_LIMIT:
 302                 gvtype = G_VARIANT_TYPE_DOUBLE;
 303                 cmd = SCPI_CMD_GET_CURRENT_LIMIT;
 304                 break;
 305         case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
 306                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 307                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ENABLED;
 308                 break;
 309         case SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE:
 310                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 311                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ACTIVE;
 312                 break;
 313         case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
 314                 gvtype = G_VARIANT_TYPE_DOUBLE;
 315                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_THRESHOLD;
 316                 break;
 317         case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
 318                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 319                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ENABLED;
 320                 break;
 321         case SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE:
 322                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 323                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ACTIVE;
 324                 break;
 325         case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
 326                 gvtype = G_VARIANT_TYPE_DOUBLE;
 327                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_THRESHOLD;
 328                 break;
 329         case SR_CONF_OVER_TEMPERATURE_PROTECTION:
 330                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 331                 cmd = SCPI_CMD_GET_OVER_TEMPERATURE_PROTECTION;
 332                 break;
 333         case SR_CONF_OUTPUT_REGULATION:
 334                 gvtype = G_VARIANT_TYPE_STRING;
 335                 cmd = SCPI_CMD_GET_OUTPUT_REGULATION;
 336         }
 337         if (gvtype) {
 338                 if (cg)
 339                         select_channel(sdi, cg->channels->data);
 340                 ret = scpi_cmd_resp(sdi, data, gvtype, cmd);
 341
 342                 if (gvtype == G_VARIANT_TYPE_STRING && ret == SR_OK) {
 343                         /* Non-standard data type responses. */
 344                         switch (key) {
 345                         case SCPI_CMD_GET_OUTPUT_REGULATION:
 346                                 /*
 347                                  * This is specific to the Rigol DP800 series.
 348                                  * We return the same string for now until more
 349                                  * models with this key are supported. Do a check
 350                                  * just for the hell of it.
 351                                  */
 352                                 s = g_variant_get_string(*data, NULL);
 353                                 if (strcmp(s, "CC") && strcmp(s, "CV") && strcmp(s, "UR")) {
 354                                         sr_dbg("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
 355                                         ret = SR_ERR_DATA;
 356                                 }
 357                                 break;
 358                         }
 359                 }
 360         } else
 361                 ret = SR_ERR_NA;
 362
 363         return ret;
 364 }
 365
 366 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 367                 const struct sr_channel_group *cg)
 368 {
 369         double d;
 370         int ret;
 371
 372         if (!sdi)
 373                 return SR_ERR_ARG;
 374
 375         if (sdi->status != SR_ST_ACTIVE)
 376                 return SR_ERR_DEV_CLOSED;
 377
 378         if (cg)
 379                 /* Channel group specified. */
 380                 select_channel(sdi, cg->channels->data);
 381
 382         ret = SR_OK;
 383         switch (key) {
 384         case SR_CONF_OUTPUT_ENABLED:
 385                 if (g_variant_get_boolean(data))
 386                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OUTPUT_ENABLE);
 387                 else
 388                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OUTPUT_DISABLE);
 389                 break;
 390         case SR_CONF_OUTPUT_VOLTAGE_TARGET:
 391                 d = g_variant_get_double(data);
 392                 ret = scpi_cmd(sdi, SCPI_CMD_SET_VOLTAGE_TARGET, d);
 393                 break;
 394         case SR_CONF_OUTPUT_CURRENT_LIMIT:
 395                 d = g_variant_get_double(data);
 396                 ret = scpi_cmd(sdi, SCPI_CMD_SET_CURRENT_LIMIT, d);
 397                 break;
 398         case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
 399                 if (g_variant_get_boolean(data))
 400                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_ENABLE);
 401                 else
 402                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_DISABLE);
 403                 break;
 404         case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
 405                 d = g_variant_get_double(data);
 406                 ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_THRESHOLD, d);
 407                 break;
 408         case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
 409                 if (g_variant_get_boolean(data))
 410                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_CURRENT_PROTECTION_ENABLE);
 411                 else
 412                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_CURRENT_PROTECTION_DISABLE);
 413                 break;
 414         case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
 415                 d = g_variant_get_double(data);
 416                 ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_CURRENT_PROTECTION_THRESHOLD, d);
 417                 break;
 418         case SR_CONF_OVER_TEMPERATURE_PROTECTION:
 419                 if (g_variant_get_boolean(data))
 420                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_ENABLE);
 421                 else
 422                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_DISABLE);
 423                 break;
 424         default:
 425                 ret = SR_ERR_NA;
 426         }
 427
 428         return ret;
 429 }
 430
 431 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 432                 const struct sr_channel_group *cg)
 433 {
 434         struct dev_context *devc;
 435         struct sr_channel *ch;
 436         struct channel_spec *ch_spec;
 437         GVariant *gvar;
 438         GVariantBuilder gvb;
 439         int ret, i;
 440         const char *s[16];
 441
 442         /* Always available, even without sdi. */
 443         if (key == SR_CONF_SCAN_OPTIONS) {
 444                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 445                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 446                 return SR_OK;
 447         }
 448
 449         if (!sdi)
 450                 return SR_ERR_ARG;
 451         devc = sdi->priv;
 452
 453         ret = SR_OK;
 454         if (!cg) {
 455                 /* No channel group: global options. */
 456                 switch (key) {
 457                 case SR_CONF_DEVICE_OPTIONS:
 458                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 459                                         devc->device->devopts, devc->device->num_devopts,
 460                                         sizeof(uint32_t));
 461                         break;
 462                 case SR_CONF_OUTPUT_CHANNEL_CONFIG:
 463                         /* Not used. */
 464                         i = 0;
 465                         if (devc->device->features & PPS_INDEPENDENT)
 466                                 s[i++] = "Independent";
 467                         if (devc->device->features & PPS_SERIES)
 468                                 s[i++] = "Series";
 469                         if (devc->device->features & PPS_PARALLEL)
 470                                 s[i++] = "Parallel";
 471                         if (i == 0) {
 472                                 /*
 473                                  * Shouldn't happen: independent-only devices
 474                                  * shouldn't advertise this option at all.
 475                                  */
 476                                 return SR_ERR_NA;
 477                         }
 478                         *data = g_variant_new_strv(s, i);
 479                         break;
 480                 default:
 481                         return SR_ERR_NA;
 482                 }
 483         } else {
 484                 /* Channel group specified. */
 485                 /*
 486                  * Per-channel-group options depending on a channel are actually
 487                  * done with the first channel. Channel groups in PPS can have
 488                  * more than one channel, but they will typically be of equal
 489                  * specification for use in series or parallel mode.
 490                  */
 491                 ch = cg->channels->data;
 492
 493                 switch (key) {
 494                 case SR_CONF_DEVICE_OPTIONS:
 495                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 496                                         devc->device->devopts_cg, devc->device->num_devopts_cg,
 497                                         sizeof(uint32_t));
 498                         break;
 499                 case SR_CONF_OUTPUT_VOLTAGE_TARGET:
 500                         ch_spec = &(devc->device->channels[ch->index]);
 501                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 502                         /* Min, max, write resolution. */
 503                         for (i = 0; i < 3; i++) {
 504                                 gvar = g_variant_new_double(ch_spec->voltage[i]);
 505                                 g_variant_builder_add_value(&gvb, gvar);
 506                         }
 507                         *data = g_variant_builder_end(&gvb);
 508                         break;
 509                 case SR_CONF_OUTPUT_CURRENT_LIMIT:
 510                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 511                         /* Min, max, step. */
 512                         for (i = 0; i < 3; i++) {
 513                                 ch_spec = &(devc->device->channels[ch->index]);
 514                                 gvar = g_variant_new_double(ch_spec->current[i]);
 515                                 g_variant_builder_add_value(&gvb, gvar);
 516                         }
 517                         *data = g_variant_builder_end(&gvb);
 518                         break;
 519                 default:
 520                         return SR_ERR_NA;
 521                 }
 522         }
 523
 524         return ret;
 525 }
 526
 527 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 528                 void *cb_data)
 529 {
 530         struct dev_context *devc;
 531         struct sr_scpi_dev_inst *scpi;
 532         struct sr_channel *ch;
 533         struct pps_channel *pch;
 534         int cmd, ret;
 535
 536         if (sdi->status != SR_ST_ACTIVE)
 537                 return SR_ERR_DEV_CLOSED;
 538
 539         devc = sdi->priv;
 540         scpi = sdi->conn;
 541         devc->cb_data = cb_data;
 542
 543         if ((ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
 544                         scpi_pps_receive_data, (void *)sdi)) != SR_OK)
 545                 return ret;
 546         std_session_send_df_header(sdi, LOG_PREFIX);
 547
 548         /* Prime the pipe with the first channel's fetch. */
 549         ch = next_enabled_channel(sdi, NULL);
 550         pch = ch->priv;
 551         if ((ret = select_channel(sdi, ch)) != SR_OK)
 552                 return ret;
 553         if (pch->mq == SR_MQ_VOLTAGE)
 554                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
 555         else if (pch->mq == SR_MQ_CURRENT)
 556                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
 557         else if (pch->mq == SR_MQ_POWER)
 558                 cmd = SCPI_CMD_GET_MEAS_POWER;
 559         else
 560                 return SR_ERR;
 561         scpi_cmd(sdi, cmd, pch->hwname);
 562
 563         return SR_OK;
 564 }
 565
 566 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 567 {
 568         struct sr_datafeed_packet packet;
 569         struct sr_scpi_dev_inst *scpi;
 570         float f;
 571
 572         (void)cb_data;
 573
 574         if (sdi->status != SR_ST_ACTIVE)
 575                 return SR_ERR_DEV_CLOSED;
 576
 577         scpi = sdi->conn;
 578
 579         /*
 580          * A requested value is certainly on the way. Retrieve it now,
 581          * to avoid leaving the device in a state where it's not expecting
 582          * commands.
 583          */
 584         sr_scpi_get_float(scpi, NULL, &f);
 585         sr_scpi_source_remove(sdi->session, scpi);
 586
 587         packet.type = SR_DF_END;
 588         sr_session_send(sdi, &packet);
 589
 590         return SR_OK;
 591 }
 592
 593 SR_PRIV struct sr_dev_driver scpi_pps_driver_info = {
 594         .name = "scpi-pps",
 595         .longname = "SCPI PPS",
 596         .api_version = 1,
 597         .init = init,
 598         .cleanup = cleanup,
 599         .scan = scan,
 600         .dev_list = dev_list,
 601         .dev_clear = dev_clear,
 602         .config_get = config_get,
 603         .config_set = config_set,
 604         .config_list = config_list,
 605         .dev_open = dev_open,
 606         .dev_close = dev_close,
 607         .dev_acquisition_start = dev_acquisition_start,
 608         .dev_acquisition_stop = dev_acquisition_stop,
 609         .priv = NULL,
 610 };