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 int32_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         const struct channel_group_spec *cgs;
  54         struct pps_channel_group *pcg;
  55         GRegex *model_re;
  56         GMatchInfo *model_mi;
  57         GSList *l;
  58         uint64_t mask;
  59         unsigned int ch_num, ch_idx, old_idx, i, j;
  60         const char *vendor;
  61         char ch_name[16];
  62
  63         if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
  64                 sr_info("Couldn't get IDN response.");
  65                 return NULL;
  66         }
  67
  68         device = NULL;
  69         for (i = 0; i < num_pps_profiles; i++) {
  70                 vendor = get_vendor(hw_info->manufacturer);
  71                 if (strcasecmp(vendor, pps_profiles[i].vendor))
  72                         continue;
  73                 model_re = g_regex_new(pps_profiles[i].model, 0, 0, NULL);
  74                 if (g_regex_match(model_re, hw_info->model, 0, &model_mi))
  75                         device = &pps_profiles[i];
  76                 g_match_info_unref(model_mi);
  77                 g_regex_unref(model_re);
  78                 if (device)
  79                         break;
  80         }
  81         if (!device) {
  82                 sr_scpi_hw_info_free(hw_info);
  83                 return NULL;
  84         }
  85
  86         sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, vendor, hw_info->model,
  87                         hw_info->firmware_version);
  88         sdi->conn = scpi;
  89         sdi->driver = di;
  90         sdi->inst_type = SR_INST_SCPI;
  91         devc = g_malloc0(sizeof(struct dev_context));
  92         devc->device = device;
  93         sdi->priv = devc;
  94
  95         ch_idx = 0;
  96         for (ch_num = 0; ch_num < device->num_channels; ch_num++) {
  97                 /* Create one channel per measurable output unit. */
  98                 old_idx = ch_idx;
  99                 for (i = 0; i < ARRAY_SIZE(pci); i++) {
 100                         if (!scpi_cmd_get(sdi, pci[i].command))
 101                                 continue;
 102                         g_snprintf(ch_name, 16, "%s%s", pci[i].prefix,
 103                                         device->channels[ch_num].name);
 104                         ch = sr_channel_new(ch_idx++, SR_CHANNEL_ANALOG, TRUE, ch_name);
 105                         pch = g_malloc0(sizeof(struct pps_channel));
 106                         pch->hw_output_idx = ch_num;
 107                         pch->hwname = device->channels[ch_num].name;
 108                         pch->mq = pci[i].mq;
 109                         ch->priv = pch;
 110                         sdi->channels = g_slist_append(sdi->channels, ch);
 111                 }
 112                 if (ch_idx == old_idx) {
 113                         /*
 114                          * Didn't create any channels for this hardware output.
 115                          * This can happen if the device has no measurement capability.
 116                          */
 117                         g_free(pch);
 118                         continue;
 119                 }
 120         }
 121
 122         for (i = 0; i < device->num_channel_groups; i++) {
 123                 cgs = &device->channel_groups[i];
 124                 cg = g_malloc0(sizeof(struct sr_channel_group));
 125                 cg->name = g_strdup(cgs->name);
 126                 for (j = 0, mask = 1; j < 64; j++, mask <<= 1) {
 127                         if (cgs->channel_index_mask & mask) {
 128                                 for (l = sdi->channels; l; l = l->next) {
 129                                         ch = l->data;
 130                                         pch = ch->priv;
 131                                         if (pch->hw_output_idx == j)
 132                                                 cg->channels = g_slist_append(cg->channels, ch);
 133                                 }
 134                         }
 135                 }
 136                 pcg = g_malloc0(sizeof(struct pps_channel_group));
 137                 pcg->features = cgs->features;
 138                 cg->priv = pcg;
 139                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 140         }
 141
 142         /* SCPI devices commonly lock the panel keys when accessed remotely. */
 143         scpi_cmd(sdi, SCPI_CMD_KEY_UNLOCK);
 144         sr_scpi_close(scpi);
 145
 146         return sdi;
 147 }
 148
 149 static GSList *scan(GSList *options)
 150 {
 151         return sr_scpi_scan(di->priv, options, probe_device);
 152 }
 153
 154 static GSList *dev_list(void)
 155 {
 156         return ((struct drv_context *)(di->priv))->instances;
 157 }
 158
 159 static int dev_clear(void)
 160 {
 161         return std_dev_clear(di, NULL);
 162 }
 163
 164 static int dev_open(struct sr_dev_inst *sdi)
 165 {
 166         struct sr_scpi_dev_inst *scpi;
 167
 168         if (sdi->status != SR_ST_ACTIVE)
 169                 return SR_ERR;
 170
 171         scpi = sdi->conn;
 172         if (sr_scpi_open(scpi) < 0)
 173                 return SR_ERR;
 174
 175         sdi->status = SR_ST_ACTIVE;
 176
 177         return SR_OK;
 178 }
 179
 180 static int dev_close(struct sr_dev_inst *sdi)
 181 {
 182         struct sr_scpi_dev_inst *scpi;
 183
 184         if (sdi->status != SR_ST_ACTIVE)
 185                 return SR_ERR_DEV_CLOSED;
 186
 187         scpi = sdi->conn;
 188         if (scpi) {
 189                 scpi_cmd(sdi, SCPI_CMD_KEY_UNLOCK);
 190                 sr_scpi_close(scpi);
 191                 sdi->status = SR_ST_INACTIVE;
 192         }
 193
 194         return SR_OK;
 195 }
 196
 197 static int cleanup(void)
 198 {
 199         return SR_OK;
 200 }
 201
 202 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 203                 const struct sr_channel_group *cg)
 204 {
 205         struct dev_context *devc;
 206         struct sr_scpi_dev_inst *scpi;
 207         struct sr_channel *ch;
 208         struct pps_channel *pch;
 209         const GVariantType *gvtype;
 210         unsigned int i;
 211         int cmd, ret;
 212         char *s;
 213
 214         if (!sdi)
 215                 return SR_ERR_ARG;
 216
 217         devc = sdi->priv;
 218         scpi = sdi->conn;
 219
 220         if (cg) {
 221                 /*
 222                  * These options only apply to channel groups with a single
 223                  * channel -- they're per-channel settings for the device.
 224                  */
 225
 226                 /*
 227                  * Config keys are handled below depending on whether a channel
 228                  * group was provided by the frontend. However some of these
 229                  * take a CG on one PPS but not on others. Check the device's
 230                  * profile for that here, and NULL out the channel group as needed.
 231                  */
 232                 for (i = 0; i < devc->device->num_devopts; i++) {
 233                         if (devc->device->devopts[i] == key) {
 234                                 cg = NULL;
 235                                 break;
 236                         }
 237                 }
 238
 239                 ch = cg->channels->data;
 240                 pch = ch->priv;
 241         }
 242
 243         gvtype = NULL;
 244         cmd = -1;
 245         switch (key) {
 246         case SR_CONF_OUTPUT_ENABLED:
 247                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 248                 cmd = SCPI_CMD_GET_OUTPUT_ENABLED;
 249                 break;
 250         case SR_CONF_OUTPUT_VOLTAGE:
 251                 gvtype = G_VARIANT_TYPE_DOUBLE;
 252                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
 253                 break;
 254         case SR_CONF_OUTPUT_VOLTAGE_MAX:
 255                 gvtype = G_VARIANT_TYPE_DOUBLE;
 256                 cmd = SCPI_CMD_GET_VOLTAGE_MAX;
 257                 break;
 258         case SR_CONF_OUTPUT_CURRENT:
 259                 gvtype = G_VARIANT_TYPE_DOUBLE;
 260                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
 261                 break;
 262         case SR_CONF_OUTPUT_CURRENT_MAX:
 263                 gvtype = G_VARIANT_TYPE_DOUBLE;
 264                 cmd = SCPI_CMD_GET_CURRENT_MAX;
 265                 break;
 266         case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
 267                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 268                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ENABLED;
 269                 break;
 270         case SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE:
 271                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 272                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ACTIVE;
 273                 break;
 274         case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
 275                 gvtype = G_VARIANT_TYPE_DOUBLE;
 276                 cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_THRESHOLD;
 277                 break;
 278         case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
 279                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 280                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ENABLED;
 281                 break;
 282         case SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE:
 283                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 284                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ACTIVE;
 285                 break;
 286         case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
 287                 gvtype = G_VARIANT_TYPE_DOUBLE;
 288                 cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_THRESHOLD;
 289                 break;
 290         case SR_CONF_OVER_TEMPERATURE_PROTECTION:
 291                 gvtype = G_VARIANT_TYPE_BOOLEAN;
 292                 cmd = SCPI_CMD_GET_OVER_TEMPERATURE_PROTECTION;
 293                 break;
 294         }
 295         if (gvtype) {
 296                 if (cg)
 297                         ret = scpi_cmd_resp(sdi, data, gvtype, cmd, pch->hwname);
 298                 else
 299                         ret = scpi_cmd_resp(sdi, data, gvtype, cmd);
 300         } else if (cg) {
 301                 switch (key) {
 302                 case SR_CONF_OUTPUT_REGULATION:
 303                         ret = SR_ERR;
 304                         if (scpi_cmd(sdi, SCPI_CMD_GET_OUTPUT_REGULATION, pch->hwname) == SR_OK) {
 305                                 if (sr_scpi_get_string(scpi, NULL, &s) == SR_OK) {
 306                                         if (strcmp(s, "CC") && strcmp(s, "CV") && strcmp(s, "UR")) {
 307                                                 sr_dbg("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
 308                                         } else {
 309                                                 *data = g_variant_new_string(s);
 310                                                 g_free(s);
 311                                                 ret = SR_OK;
 312                                         }
 313                                 }
 314                         }
 315                         break;
 316                 default:
 317                         ret = SR_ERR_NA;
 318                 }
 319         } else
 320                 ret = SR_ERR_NA;
 321
 322         return ret;
 323 }
 324
 325 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 326                 const struct sr_channel_group *cg)
 327 {
 328         struct sr_channel *ch;
 329         struct pps_channel *pch;
 330         double d;
 331         int ret;
 332         const char *s;
 333
 334         if (!sdi)
 335                 return SR_ERR_ARG;
 336
 337         if (sdi->status != SR_ST_ACTIVE)
 338                 return SR_ERR_DEV_CLOSED;
 339
 340         ret = SR_OK;
 341         if (!cg) {
 342                 switch (key) {
 343                 /* No channel group: global options. */
 344                 case SR_CONF_OUTPUT_ENABLED:
 345                         s = g_variant_get_boolean(data) ? "ON" : "OFF";
 346                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OUTPUT_ENABLED, s);
 347                         break;
 348                 case SR_CONF_OUTPUT_VOLTAGE_MAX:
 349                         d = g_variant_get_double(data);
 350                         ret = scpi_cmd(sdi, SCPI_CMD_SET_VOLTAGE_MAX, d);
 351                         break;
 352                 case SR_CONF_OUTPUT_CURRENT_MAX:
 353                         d = g_variant_get_double(data);
 354                         ret = scpi_cmd(sdi, SCPI_CMD_SET_CURRENT_MAX, d);
 355                         break;
 356                 case SR_CONF_OVER_TEMPERATURE_PROTECTION:
 357                         s = g_variant_get_boolean(data) ? "ON" : "OFF";
 358                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION, s);
 359                         break;
 360                 default:
 361                         ret = SR_ERR_NA;
 362                 }
 363         } else {
 364                 /* Channel group specified. */
 365                 ch = cg->channels->data;
 366                 pch = ch->priv;
 367                 switch (key) {
 368                 case SR_CONF_OUTPUT_ENABLED:
 369                         s = g_variant_get_boolean(data) ? "ON" : "OFF";
 370                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OUTPUT_ENABLED, pch->hwname, s);
 371                         break;
 372                 case SR_CONF_OUTPUT_VOLTAGE_MAX:
 373                         d = g_variant_get_double(data);
 374                         ret = scpi_cmd(sdi, SCPI_CMD_SET_VOLTAGE_MAX, pch->hwname, d);
 375                         break;
 376                 case SR_CONF_OUTPUT_CURRENT_MAX:
 377                         d = g_variant_get_double(data);
 378                         ret = scpi_cmd(sdi, SCPI_CMD_SET_CURRENT_MAX, pch->hwname, d);
 379                         break;
 380                 case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
 381                         s = g_variant_get_boolean(data) ? "ON" : "OFF";
 382                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_ENABLED,
 383                                         pch->hwname, s);
 384                         break;
 385                 case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
 386                         d = g_variant_get_double(data);
 387                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_THRESHOLD,
 388                                         pch->hwname, d);
 389                         break;
 390                 case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
 391                         s = g_variant_get_boolean(data) ? "ON" : "OFF";
 392                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_CURRENT_PROTECTION_ENABLED,
 393                                         pch->hwname, s);
 394                         break;
 395                 case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
 396                         d = g_variant_get_double(data);
 397                         ret = scpi_cmd(sdi, SCPI_CMD_SET_OVER_CURRENT_PROTECTION_THRESHOLD,
 398                                         pch->hwname, d);
 399                         break;
 400                 default:
 401                         ret = SR_ERR_NA;
 402                 }
 403         }
 404
 405         return ret;
 406 }
 407
 408 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 409                 const struct sr_channel_group *cg)
 410 {
 411         struct dev_context *devc;
 412         struct sr_channel *ch;
 413         struct channel_spec *ch_spec;
 414         GVariant *gvar;
 415         GVariantBuilder gvb;
 416         int ret, i;
 417         const char *s[16];
 418
 419         /* Always available, even without sdi. */
 420         if (key == SR_CONF_SCAN_OPTIONS) {
 421                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 422                                 scanopts, ARRAY_SIZE(scanopts), sizeof(int32_t));
 423                 return SR_OK;
 424         }
 425
 426         if (!sdi)
 427                 return SR_ERR_ARG;
 428         devc = sdi->priv;
 429
 430         ret = SR_OK;
 431         if (!cg) {
 432                 /* No channel group: global options. */
 433                 switch (key) {
 434                 case SR_CONF_DEVICE_OPTIONS:
 435                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 436                                         devc->device->devopts, devc->device->num_devopts,
 437                                         sizeof(int32_t));
 438                         break;
 439                 case SR_CONF_OUTPUT_CHANNEL_CONFIG:
 440                         /* Not used. */
 441                         i = 0;
 442                         if (devc->device->features & PPS_INDEPENDENT)
 443                                 s[i++] = "Independent";
 444                         if (devc->device->features & PPS_SERIES)
 445                                 s[i++] = "Series";
 446                         if (devc->device->features & PPS_PARALLEL)
 447                                 s[i++] = "Parallel";
 448                         if (i == 0) {
 449                                 /*
 450                                  * Shouldn't happen: independent-only devices
 451                                  * shouldn't advertise this option at all.
 452                                  */
 453                                 return SR_ERR_NA;
 454                         }
 455                         *data = g_variant_new_strv(s, i);
 456                         break;
 457                 default:
 458                         return SR_ERR_NA;
 459                 }
 460         } else {
 461                 /* Channel group specified. */
 462                 /*
 463                  * Per-channel-group options depending on a channel are actually
 464                  * done with the first channel. Channel groups in PPS can have
 465                  * more than one channel, but they will typically be of equal
 466                  * specification for use in series or parallel mode.
 467                  */
 468                 ch = cg->channels->data;
 469
 470                 switch (key) {
 471                 case SR_CONF_DEVICE_OPTIONS:
 472                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 473                                         devc->device->devopts_cg, devc->device->num_devopts_cg,
 474                                         sizeof(int32_t));
 475                         break;
 476                 case SR_CONF_OUTPUT_VOLTAGE_MAX:
 477                         ch_spec = &(devc->device->channels[ch->index]);
 478                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 479                         /* Min, max, write resolution. */
 480                         for (i = 0; i < 3; i++) {
 481                                 gvar = g_variant_new_double(ch_spec->voltage[i]);
 482                                 g_variant_builder_add_value(&gvb, gvar);
 483                         }
 484                         *data = g_variant_builder_end(&gvb);
 485                         break;
 486                 case SR_CONF_OUTPUT_CURRENT_MAX:
 487                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 488                         /* Min, max, step. */
 489                         for (i = 0; i < 3; i++) {
 490                                 ch_spec = &(devc->device->channels[ch->index]);
 491                                 gvar = g_variant_new_double(ch_spec->current[i]);
 492                                 g_variant_builder_add_value(&gvb, gvar);
 493                         }
 494                         *data = g_variant_builder_end(&gvb);
 495                         break;
 496                 default:
 497                         return SR_ERR_NA;
 498                 }
 499         }
 500
 501         return ret;
 502 }
 503
 504 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 505                 void *cb_data)
 506 {
 507         struct dev_context *devc;
 508         struct sr_scpi_dev_inst *scpi;
 509         struct sr_channel *ch;
 510         struct pps_channel *pch;
 511         int cmd, ret;
 512
 513         if (sdi->status != SR_ST_ACTIVE)
 514                 return SR_ERR_DEV_CLOSED;
 515
 516         devc = sdi->priv;
 517         scpi = sdi->conn;
 518         devc->cb_data = cb_data;
 519
 520         if ((ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
 521                         scpi_pps_receive_data, (void *)sdi)) != SR_OK)
 522                 return ret;
 523         std_session_send_df_header(sdi, LOG_PREFIX);
 524
 525         /* Prime the pipe with the first channel's fetch. */
 526         ch = sdi->channels->data;
 527         pch = ch->priv;
 528         devc->cur_channel = ch;
 529         if (pch->mq == SR_MQ_VOLTAGE)
 530                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
 531         else if (pch->mq == SR_MQ_CURRENT)
 532                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
 533         else if (pch->mq == SR_MQ_POWER)
 534                 cmd = SCPI_CMD_GET_MEAS_POWER;
 535         else
 536                 return SR_ERR;
 537         scpi_cmd(sdi, cmd, pch->hwname);
 538
 539         return SR_OK;
 540 }
 541
 542 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 543 {
 544         struct sr_scpi_dev_inst *scpi;
 545         float f;
 546
 547         (void)cb_data;
 548
 549         if (sdi->status != SR_ST_ACTIVE)
 550                 return SR_ERR_DEV_CLOSED;
 551
 552         scpi = sdi->conn;
 553
 554         /*
 555          * A requested value is certainly on the way. Retrieve it now,
 556          * to avoid leaving the device in a state where it's not expecting
 557          * commands.
 558          */
 559         sr_scpi_get_float(scpi, NULL, &f);
 560         sr_scpi_source_remove(sdi->session, scpi);
 561
 562         return SR_OK;
 563 }
 564
 565 SR_PRIV struct sr_dev_driver scpi_pps_driver_info = {
 566         .name = "scpi-pps",
 567         .longname = "SCPI PPS",
 568         .api_version = 1,
 569         .init = init,
 570         .cleanup = cleanup,
 571         .scan = scan,
 572         .dev_list = dev_list,
 573         .dev_clear = dev_clear,
 574         .config_get = config_get,
 575         .config_set = config_set,
 576         .config_list = config_list,
 577         .dev_open = dev_open,
 578         .dev_close = dev_close,
 579         .dev_acquisition_start = dev_acquisition_start,
 580         .dev_acquisition_stop = dev_acquisition_stop,
 581         .priv = NULL,
 582 };