src/hardware/sysclk-lwla/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Daniel Elstner <daniel.kitta@gmail.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 <config.h>
  21 #include <glib.h>
  22 #include <libusb.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <libsigrok/libsigrok.h>
  26 #include <libsigrok-internal.h>
  27 #include "protocol.h"
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t drvopts[] = {
  34         SR_CONF_LOGIC_ANALYZER,
  35 };
  36
  37 static const int32_t trigger_matches[] = {
  38         SR_TRIGGER_ZERO,
  39         SR_TRIGGER_ONE,
  40         SR_TRIGGER_RISING,
  41         SR_TRIGGER_FALLING,
  42 };
  43
  44 static const char *trigger_sources[] = {
  45         [TRIGGER_CHANNELS] = "CH",
  46         [TRIGGER_EXT_TRG] = "TRG",
  47 };
  48
  49 static const char *signal_edges[] = {
  50         [EDGE_POSITIVE] = "r",
  51         [EDGE_NEGATIVE] = "f",
  52 };
  53
  54 static struct sr_dev_inst *dev_inst_new(const struct model_info *model)
  55 {
  56         struct sr_dev_inst *sdi;
  57         struct dev_context *devc;
  58         int i;
  59         char name[8];
  60
  61         devc = g_malloc0(sizeof(struct dev_context));
  62         devc->model = model;
  63         devc->active_fpga_config = FPGA_NOCONF;
  64         devc->cfg_rle = TRUE;
  65         devc->samplerate = model->samplerates[0];
  66         devc->channel_mask = (UINT64_C(1) << model->num_channels) - 1;
  67
  68         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  69         sdi->status = SR_ST_INACTIVE;
  70         sdi->vendor = g_strdup("SysClk");
  71         sdi->model = g_strdup(model->name);
  72         sdi->priv = devc;
  73
  74         for (i = 0; i < model->num_channels; i++) {
  75                 g_snprintf(name, sizeof(name), "CH%d", i + 1);
  76                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, name);
  77         }
  78
  79         return sdi;
  80 }
  81
  82 /* Create a new device instance for a libusb device if it is a SysClk LWLA
  83  * device and also matches the connection specification.
  84  */
  85 static struct sr_dev_inst *dev_inst_new_matching(GSList *conn_matches,
  86                                                  libusb_device *dev)
  87 {
  88         GSList *node;
  89         struct sr_usb_dev_inst *usb;
  90         const struct model_info *model;
  91         struct sr_dev_inst *sdi;
  92         struct libusb_device_descriptor des;
  93         int bus, address, ret;
  94         unsigned int vid, pid;
  95
  96         bus = libusb_get_bus_number(dev);
  97         address = libusb_get_device_address(dev);
  98
  99         for (node = conn_matches; node != NULL; node = node->next) {
 100                 usb = node->data;
 101                 if (usb && usb->bus == bus && usb->address == address)
 102                         break; /* found */
 103         }
 104         if (conn_matches && !node)
 105                 return NULL; /* no match */
 106
 107         ret = libusb_get_device_descriptor(dev, &des);
 108         if (ret != 0) {
 109                 sr_err("Failed to get USB device descriptor: %s.",
 110                         libusb_error_name(ret));
 111                 return NULL;
 112         }
 113         vid = des.idVendor;
 114         pid = des.idProduct;
 115
 116         /* Create sigrok device instance. */
 117         if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1016) {
 118                 model = &lwla1016_info;
 119         } else if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1034) {
 120                 model = &lwla1034_info;
 121         } else {
 122                 if (conn_matches)
 123                         sr_warn("USB device %d.%d (%04x:%04x) is not a"
 124                                 " SysClk LWLA.", bus, address, vid, pid);
 125                 return NULL;
 126         }
 127         sdi = dev_inst_new(model);
 128
 129         sdi->inst_type = SR_INST_USB;
 130         sdi->conn = sr_usb_dev_inst_new(bus, address, NULL);
 131
 132         return sdi;
 133 }
 134
 135 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 136 {
 137         GSList *conn_devices, *devices, *node;
 138         struct drv_context *drvc;
 139         struct sr_dev_inst *sdi;
 140         struct sr_config *src;
 141         const char *conn;
 142         libusb_device **devlist;
 143         ssize_t num_devs, i;
 144
 145         drvc = di->context;
 146         conn = NULL;
 147         conn_devices = NULL;
 148         devices = NULL;
 149
 150         for (node = options; node != NULL; node = node->next) {
 151                 src = node->data;
 152                 if (src->key == SR_CONF_CONN) {
 153                         conn = g_variant_get_string(src->data, NULL);
 154                         break;
 155                 }
 156         }
 157         if (conn) {
 158                 /* Find devices matching the connection specification. */
 159                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 160         }
 161
 162         /* List all libusb devices. */
 163         num_devs = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 164         if (num_devs < 0) {
 165                 sr_err("Failed to list USB devices: %s.",
 166                         libusb_error_name(num_devs));
 167                 g_slist_free_full(conn_devices,
 168                         (GDestroyNotify)&sr_usb_dev_inst_free);
 169                 return NULL;
 170         }
 171
 172         /* Scan the USB device list for matching LWLA devices. */
 173         for (i = 0; i < num_devs; i++) {
 174                 sdi = dev_inst_new_matching(conn_devices, devlist[i]);
 175                 if (!sdi)
 176                         continue; /* no match */
 177
 178                 /* Register device instance with driver. */
 179                 devices = g_slist_append(devices, sdi);
 180         }
 181
 182         libusb_free_device_list(devlist, 1);
 183         g_slist_free_full(conn_devices, (GDestroyNotify)&sr_usb_dev_inst_free);
 184
 185         return std_scan_complete(di, devices);
 186 }
 187
 188 /* Drain any pending data from the USB transfer buffers on the device.
 189  * This may be necessary e.g. after a crash or generally to clean up after
 190  * an abnormal condition.
 191  */
 192 static int drain_usb(struct sr_usb_dev_inst *usb, unsigned int endpoint)
 193 {
 194         int drained, xfer_len, ret;
 195         unsigned char buf[512];
 196         const unsigned int drain_timeout_ms = 10;
 197
 198         drained = 0;
 199         do {
 200                 xfer_len = 0;
 201                 ret = libusb_bulk_transfer(usb->devhdl, endpoint,
 202                                            buf, sizeof(buf), &xfer_len,
 203                                            drain_timeout_ms);
 204                 drained += xfer_len;
 205         } while (ret == LIBUSB_SUCCESS && xfer_len != 0);
 206
 207         if (ret != LIBUSB_SUCCESS && ret != LIBUSB_ERROR_TIMEOUT) {
 208                 sr_err("Failed to drain USB endpoint %u: %s.",
 209                        endpoint & (LIBUSB_ENDPOINT_IN - 1),
 210                        libusb_error_name(ret));
 211                 return SR_ERR;
 212         }
 213         if (drained > 0) {
 214                 sr_warn("Drained %d bytes from USB endpoint %u.",
 215                         drained, endpoint & (LIBUSB_ENDPOINT_IN - 1));
 216         }
 217
 218         return SR_OK;
 219 }
 220
 221 static int dev_open(struct sr_dev_inst *sdi)
 222 {
 223         struct drv_context *drvc;
 224         struct dev_context *devc;
 225         struct sr_usb_dev_inst *usb;
 226         int i, ret;
 227
 228         drvc = sdi->driver->context;
 229         devc = sdi->priv;
 230         usb = sdi->conn;
 231
 232         /* Try the whole shebang three times, fingers crossed. */
 233         for (i = 0; i < 3; i++) {
 234                 ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 235                 if (ret != SR_OK)
 236                         return ret;
 237
 238                 ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 239                 if (ret != LIBUSB_SUCCESS) {
 240                         sr_err("Failed to set USB configuration: %s.",
 241                                 libusb_error_name(ret));
 242                         sr_usb_close(usb);
 243                         return SR_ERR;
 244                 }
 245
 246                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 247                 if (ret != LIBUSB_SUCCESS) {
 248                         sr_err("Failed to claim interface: %s.",
 249                                 libusb_error_name(ret));
 250                         sr_usb_close(usb);
 251                         return SR_ERR;
 252                 }
 253
 254                 ret = drain_usb(usb, EP_REPLY);
 255                 if (ret != SR_OK) {
 256                         sr_usb_close(usb);
 257                         return ret;
 258                 }
 259                 /* This delay appears to be necessary for reliable operation. */
 260                 g_usleep(30 * 1000);
 261
 262                 sdi->status = SR_ST_ACTIVE;
 263
 264                 devc->active_fpga_config = FPGA_NOCONF;
 265                 devc->short_transfer_quirk = FALSE;
 266                 devc->state = STATE_IDLE;
 267
 268                 ret = (*devc->model->apply_fpga_config)(sdi);
 269
 270                 if (ret == SR_OK)
 271                         ret = (*devc->model->device_init_check)(sdi);
 272                 if (ret == SR_OK)
 273                         break;
 274
 275                 /* Rinse and repeat. */
 276                 sdi->status = SR_ST_INACTIVE;
 277                 sr_usb_close(usb);
 278         }
 279
 280         if (ret == SR_OK && devc->short_transfer_quirk)
 281                 sr_warn("Short transfer quirk detected! "
 282                         "Memory reads will be slow.");
 283         return ret;
 284 }
 285
 286 static int dev_close(struct sr_dev_inst *sdi)
 287 {
 288         struct dev_context *devc;
 289         struct sr_usb_dev_inst *usb;
 290         int ret;
 291
 292         devc = sdi->priv;
 293         usb = sdi->conn;
 294
 295         if (devc->acquisition) {
 296                 sr_err("Cannot close device during acquisition!");
 297                 /* Request stop, leak handle, and prepare for the worst. */
 298                 devc->cancel_requested = TRUE;
 299                 return SR_ERR_BUG;
 300         }
 301
 302         /* Download of the shutdown bitstream, if any. */
 303         ret = (*devc->model->apply_fpga_config)(sdi);
 304         if (ret != SR_OK)
 305                 sr_warn("Unable to shut down device.");
 306
 307         if (usb->devhdl)
 308                 libusb_release_interface(usb->devhdl, USB_INTERFACE);
 309
 310         sr_usb_close(usb);
 311
 312         return ret;
 313 }
 314
 315 /* Check whether the device options contain a specific key.
 316  * Also match against get/set/list bits if specified.
 317  */
 318 static int has_devopt(const struct model_info *model, uint32_t key)
 319 {
 320         unsigned int i;
 321
 322         for (i = 0; i < model->num_devopts; i++) {
 323                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 324                         return TRUE;
 325         }
 326
 327         return FALSE;
 328 }
 329
 330 static int config_get(uint32_t key, GVariant **data,
 331         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 332 {
 333         struct dev_context *devc;
 334         unsigned int idx;
 335
 336         (void)cg;
 337
 338         if (!sdi)
 339                 return SR_ERR_ARG;
 340
 341         devc = sdi->priv;
 342
 343         if (!has_devopt(devc->model, key | SR_CONF_GET))
 344                 return SR_ERR_NA;
 345
 346         switch (key) {
 347         case SR_CONF_SAMPLERATE:
 348                 *data = g_variant_new_uint64(devc->samplerate);
 349                 break;
 350         case SR_CONF_LIMIT_MSEC:
 351                 *data = g_variant_new_uint64(devc->limit_msec);
 352                 break;
 353         case SR_CONF_LIMIT_SAMPLES:
 354                 *data = g_variant_new_uint64(devc->limit_samples);
 355                 break;
 356         case SR_CONF_RLE:
 357                 *data = g_variant_new_boolean(devc->cfg_rle);
 358                 break;
 359         case SR_CONF_EXTERNAL_CLOCK:
 360                 *data = g_variant_new_boolean(devc->cfg_clock_source
 361                                                 == CLOCK_EXT_CLK);
 362                 break;
 363         case SR_CONF_CLOCK_EDGE:
 364                 idx = devc->cfg_clock_edge;
 365                 if (idx >= ARRAY_SIZE(signal_edges))
 366                         return SR_ERR_BUG;
 367                 *data = g_variant_new_string(signal_edges[idx]);
 368                 break;
 369         case SR_CONF_TRIGGER_SOURCE:
 370                 idx = devc->cfg_trigger_source;
 371                 if (idx >= ARRAY_SIZE(trigger_sources))
 372                         return SR_ERR_BUG;
 373                 *data = g_variant_new_string(trigger_sources[idx]);
 374                 break;
 375         case SR_CONF_TRIGGER_SLOPE:
 376                 idx = devc->cfg_trigger_slope;
 377                 if (idx >= ARRAY_SIZE(signal_edges))
 378                         return SR_ERR_BUG;
 379                 *data = g_variant_new_string(signal_edges[idx]);
 380                 break;
 381         default:
 382                 /* Must not happen for a key listed in devopts. */
 383                 return SR_ERR_BUG;
 384         }
 385
 386         return SR_OK;
 387 }
 388
 389 static int config_set(uint32_t key, GVariant *data,
 390         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 391 {
 392         uint64_t value;
 393         struct dev_context *devc;
 394         int idx;
 395
 396         (void)cg;
 397
 398         if (!sdi)
 399                 return SR_ERR_ARG;
 400
 401         devc = sdi->priv;
 402
 403         if (!has_devopt(devc->model, key | SR_CONF_SET))
 404                 return SR_ERR_NA;
 405
 406         switch (key) {
 407         case SR_CONF_SAMPLERATE:
 408                 value = g_variant_get_uint64(data);
 409                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 410                                 || value > devc->model->samplerates[0])
 411                         return SR_ERR_SAMPLERATE;
 412                 devc->samplerate = value;
 413                 break;
 414         case SR_CONF_LIMIT_MSEC:
 415                 value = g_variant_get_uint64(data);
 416                 if (value > MAX_LIMIT_MSEC)
 417                         return SR_ERR_ARG;
 418                 devc->limit_msec = value;
 419                 break;
 420         case SR_CONF_LIMIT_SAMPLES:
 421                 value = g_variant_get_uint64(data);
 422                 if (value > MAX_LIMIT_SAMPLES)
 423                         return SR_ERR_ARG;
 424                 devc->limit_samples = value;
 425                 break;
 426         case SR_CONF_RLE:
 427                 devc->cfg_rle = g_variant_get_boolean(data);
 428                 break;
 429         case SR_CONF_EXTERNAL_CLOCK:
 430                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 431                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 432                 break;
 433         case SR_CONF_CLOCK_EDGE:
 434                 if ((idx = std_str_idx(data, ARRAY_AND_SIZE(signal_edges))) < 0)
 435                         return SR_ERR_ARG;
 436                 devc->cfg_clock_edge = idx;
 437                 break;
 438         case SR_CONF_TRIGGER_SOURCE:
 439                 if ((idx = std_str_idx(data, ARRAY_AND_SIZE(trigger_sources))) < 0)
 440                         return SR_ERR_ARG;
 441                 devc->cfg_trigger_source = idx;
 442                 break;
 443         case SR_CONF_TRIGGER_SLOPE:
 444                 if ((idx = std_str_idx(data, ARRAY_AND_SIZE(signal_edges))) < 0)
 445                         return SR_ERR_ARG;
 446                 devc->cfg_trigger_slope = idx;
 447                 break;
 448         default:
 449                 /* Must not happen for a key listed in devopts. */
 450                 return SR_ERR_BUG;
 451         }
 452
 453         return SR_OK;
 454 }
 455
 456 static int config_channel_set(const struct sr_dev_inst *sdi,
 457         struct sr_channel *ch, unsigned int changes)
 458 {
 459         uint64_t channel_bit;
 460         struct dev_context *devc;
 461
 462         if (!sdi)
 463                 return SR_ERR_ARG;
 464
 465         devc = sdi->priv;
 466
 467         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 468                 sr_err("Channel index %d out of range.", ch->index);
 469                 return SR_ERR_BUG;
 470         }
 471
 472         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 473                 channel_bit = UINT64_C(1) << ch->index;
 474
 475                 /* Enable or disable logic input for this channel. */
 476                 if (ch->enabled)
 477                         devc->channel_mask |= channel_bit;
 478                 else
 479                         devc->channel_mask &= ~channel_bit;
 480         }
 481
 482         return SR_OK;
 483 }
 484
 485 /* Derive trigger masks from the session's trigger configuration. */
 486 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 487 {
 488         uint64_t trigger_mask, trigger_values, trigger_edge_mask;
 489         uint64_t level_bit, type_bit;
 490         struct dev_context *devc;
 491         struct sr_trigger *trigger;
 492         struct sr_trigger_stage *stage;
 493         struct sr_trigger_match *match;
 494         const GSList *node;
 495         int idx;
 496         enum sr_trigger_matches trg;
 497
 498         devc = sdi->priv;
 499
 500         trigger = sr_session_trigger_get(sdi->session);
 501         if (!trigger || !trigger->stages)
 502                 return SR_OK;
 503
 504         if (trigger->stages->next) {
 505                 sr_err("This device only supports 1 trigger stage.");
 506                 return SR_ERR_ARG;
 507         }
 508         stage = trigger->stages->data;
 509
 510         trigger_mask = 0;
 511         trigger_values = 0;
 512         trigger_edge_mask = 0;
 513
 514         for (node = stage->matches; node; node = node->next) {
 515                 match = node->data;
 516
 517                 if (!match->channel->enabled)
 518                         continue; /* Ignore disabled channel. */
 519
 520                 idx = match->channel->index;
 521                 trg = match->match;
 522
 523                 if (idx < 0 || idx >= devc->model->num_channels) {
 524                         sr_err("Channel index %d out of range.", idx);
 525                         return SR_ERR_BUG; /* Should not happen. */
 526                 }
 527                 if (trg != SR_TRIGGER_ZERO
 528                                 && trg != SR_TRIGGER_ONE
 529                                 && trg != SR_TRIGGER_RISING
 530                                 && trg != SR_TRIGGER_FALLING) {
 531                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 532                         return SR_ERR_ARG;
 533                 }
 534                 level_bit = (trg == SR_TRIGGER_ONE
 535                         || trg == SR_TRIGGER_RISING) ? 1 : 0;
 536                 type_bit = (trg == SR_TRIGGER_RISING
 537                         || trg == SR_TRIGGER_FALLING) ? 1 : 0;
 538
 539                 trigger_mask |= UINT64_C(1) << idx;
 540                 trigger_values |= level_bit << idx;
 541                 trigger_edge_mask |= type_bit << idx;
 542         }
 543         devc->trigger_mask = trigger_mask;
 544         devc->trigger_values = trigger_values;
 545         devc->trigger_edge_mask = trigger_edge_mask;
 546
 547         return SR_OK;
 548 }
 549
 550 static int config_commit(const struct sr_dev_inst *sdi)
 551 {
 552         struct dev_context *devc;
 553         int ret;
 554
 555         devc = sdi->priv;
 556
 557         if (devc->acquisition) {
 558                 sr_err("Acquisition still in progress?");
 559                 return SR_ERR;
 560         }
 561
 562         ret = prepare_trigger_masks(sdi);
 563         if (ret != SR_OK)
 564                 return ret;
 565
 566         ret = (*devc->model->apply_fpga_config)(sdi);
 567         if (ret != SR_OK) {
 568                 sr_err("Failed to apply FPGA configuration.");
 569                 return ret;
 570         }
 571
 572         return SR_OK;
 573 }
 574
 575 static int config_list(uint32_t key, GVariant **data,
 576         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 577 {
 578         struct dev_context *devc;
 579
 580         devc = (sdi) ? sdi->priv : NULL;
 581
 582         switch (key) {
 583         case SR_CONF_SCAN_OPTIONS:
 584         case SR_CONF_DEVICE_OPTIONS:
 585                 return std_opts_config_list(key, data, sdi, cg,
 586                         ARRAY_AND_SIZE(scanopts), ARRAY_AND_SIZE(drvopts),
 587                         (devc) ? devc->model->devopts : NULL,
 588                         (devc) ? devc->model->num_devopts : 0);
 589         }
 590
 591         if (!devc)
 592                 return SR_ERR_ARG;
 593         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 594                 return SR_ERR_NA;
 595
 596         switch (key) {
 597         case SR_CONF_SAMPLERATE:
 598                 *data = std_gvar_samplerates(devc->model->samplerates, devc->model->num_samplerates);
 599                 break;
 600         case SR_CONF_TRIGGER_MATCH:
 601                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 602                 break;
 603         case SR_CONF_TRIGGER_SOURCE:
 604                 *data = g_variant_new_strv(ARRAY_AND_SIZE(trigger_sources));
 605                 break;
 606         case SR_CONF_TRIGGER_SLOPE:
 607         case SR_CONF_CLOCK_EDGE:
 608                 *data = g_variant_new_strv(ARRAY_AND_SIZE(signal_edges));
 609                 break;
 610         default:
 611                 /* Must not happen for a key listed in devopts. */
 612                 return SR_ERR_BUG;
 613         }
 614
 615         return SR_OK;
 616 }
 617
 618 /* Set up the device hardware to begin capturing samples as soon as the
 619  * configured trigger conditions are met, or immediately if no triggers
 620  * are configured.
 621  */
 622 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 623 {
 624         return lwla_start_acquisition(sdi);
 625 }
 626
 627 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 628 {
 629         struct dev_context *devc;
 630
 631         devc = sdi->priv;
 632
 633         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 634                 devc->cancel_requested = TRUE;
 635                 sr_dbg("Requesting cancel.");
 636         }
 637
 638         return SR_OK;
 639 }
 640
 641 static struct sr_dev_driver sysclk_lwla_driver_info = {
 642         .name = "sysclk-lwla",
 643         .longname = "SysClk LWLA series",
 644         .api_version = 1,
 645         .init = std_init,
 646         .cleanup = std_cleanup,
 647         .scan = scan,
 648         .dev_list = std_dev_list,
 649         .dev_clear = std_dev_clear,
 650         .config_get = config_get,
 651         .config_set = config_set,
 652         .config_channel_set = config_channel_set,
 653         .config_commit = config_commit,
 654         .config_list = config_list,
 655         .dev_open = dev_open,
 656         .dev_close = dev_close,
 657         .dev_acquisition_start = dev_acquisition_start,
 658         .dev_acquisition_stop = dev_acquisition_stop,
 659         .context = NULL,
 660 };
 661 SR_REGISTER_DEV_DRIVER(sysclk_lwla_driver_info);