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 /* Supported device scan options.
  30  */
  31 static const uint32_t scanopts[] = {
  32         SR_CONF_CONN,
  33 };
  34
  35 /* Driver capabilities.
  36  */
  37 static const uint32_t drvopts[] = {
  38         SR_CONF_LOGIC_ANALYZER,
  39 };
  40
  41 /* Supported trigger match conditions.
  42  */
  43 static const int32_t trigger_matches[] = {
  44         SR_TRIGGER_ZERO,
  45         SR_TRIGGER_ONE,
  46         SR_TRIGGER_RISING,
  47         SR_TRIGGER_FALLING,
  48 };
  49
  50 /* Names assigned to available trigger sources.
  51  */
  52 static const char *const trigger_source_names[] = {
  53         [TRIGGER_CHANNELS] = "CH",
  54         [TRIGGER_EXT_TRG] = "TRG",
  55 };
  56
  57 /* Names assigned to available edge slope choices.
  58  */
  59 static const char *const signal_edge_names[] = {
  60         [EDGE_POSITIVE] = "r",
  61         [EDGE_NEGATIVE] = "f",
  62 };
  63
  64 /* Create a new sigrok device instance for the indicated LWLA model.
  65  */
  66 static struct sr_dev_inst *dev_inst_new(const struct model_info *model)
  67 {
  68         struct sr_dev_inst *sdi;
  69         struct dev_context *devc;
  70         int i;
  71         char name[8];
  72
  73         /* Initialize private device context. */
  74         devc = g_malloc0(sizeof(struct dev_context));
  75         devc->model = model;
  76         devc->active_fpga_config = FPGA_NOCONF;
  77         devc->cfg_rle = TRUE;
  78         devc->samplerate = model->samplerates[0];
  79         devc->channel_mask = (UINT64_C(1) << model->num_channels) - 1;
  80
  81         /* Create sigrok device instance. */
  82         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  83         sdi->status = SR_ST_INACTIVE;
  84         sdi->vendor = g_strdup(VENDOR_NAME);
  85         sdi->model = g_strdup(model->name);
  86         sdi->priv = devc;
  87
  88         /* Generate list of logic channels. */
  89         for (i = 0; i < model->num_channels; i++) {
  90                 /* The LWLA series simply number channels from CH1 to CHxx. */
  91                 g_snprintf(name, sizeof(name), "CH%d", i + 1);
  92                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, name);
  93         }
  94
  95         return sdi;
  96 }
  97
  98 /* Create a new device instance for a libusb device if it is a SysClk LWLA
  99  * device and also matches the connection specification.
 100  */
 101 static struct sr_dev_inst *dev_inst_new_matching(GSList *conn_matches,
 102                                                  libusb_device *dev)
 103 {
 104         GSList *node;
 105         struct sr_usb_dev_inst *usb;
 106         const struct model_info *model;
 107         struct sr_dev_inst *sdi;
 108         struct libusb_device_descriptor des;
 109         int bus, address, ret;
 110         unsigned int vid, pid;
 111
 112         bus = libusb_get_bus_number(dev);
 113         address = libusb_get_device_address(dev);
 114
 115         for (node = conn_matches; node != NULL; node = node->next) {
 116                 usb = node->data;
 117                 if (usb && usb->bus == bus && usb->address == address)
 118                         break; /* found */
 119         }
 120         if (conn_matches && !node)
 121                 return NULL; /* no match */
 122
 123         ret = libusb_get_device_descriptor(dev, &des);
 124         if (ret != 0) {
 125                 sr_err("Failed to get USB device descriptor: %s.",
 126                         libusb_error_name(ret));
 127                 return NULL;
 128         }
 129         vid = des.idVendor;
 130         pid = des.idProduct;
 131
 132         /* Create sigrok device instance. */
 133         if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1016) {
 134                 model = &lwla1016_info;
 135         } else if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1034) {
 136                 model = &lwla1034_info;
 137         } else {
 138                 if (conn_matches)
 139                         sr_warn("USB device %d.%d (%04x:%04x) is not a"
 140                                 " SysClk LWLA.", bus, address, vid, pid);
 141                 return NULL;
 142         }
 143         sdi = dev_inst_new(model);
 144
 145         sdi->inst_type = SR_INST_USB;
 146         sdi->conn = sr_usb_dev_inst_new(bus, address, NULL);
 147
 148         return sdi;
 149 }
 150
 151 /* Scan for SysClk LWLA devices and create a device instance for each one.
 152  */
 153 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 154 {
 155         GSList *conn_devices, *devices, *node;
 156         struct drv_context *drvc;
 157         struct sr_dev_inst *sdi;
 158         struct sr_config *src;
 159         const char *conn;
 160         libusb_device **devlist;
 161         ssize_t num_devs, i;
 162
 163         drvc = di->context;
 164         conn = NULL;
 165         conn_devices = NULL;
 166         devices = NULL;
 167
 168         for (node = options; node != NULL; node = node->next) {
 169                 src = node->data;
 170                 if (src->key == SR_CONF_CONN) {
 171                         conn = g_variant_get_string(src->data, NULL);
 172                         break;
 173                 }
 174         }
 175         if (conn) {
 176                 /* Find devices matching the connection specification. */
 177                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 178         }
 179
 180         /* List all libusb devices. */
 181         num_devs = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 182         if (num_devs < 0) {
 183                 sr_err("Failed to list USB devices: %s.",
 184                         libusb_error_name(num_devs));
 185                 g_slist_free_full(conn_devices,
 186                         (GDestroyNotify)&sr_usb_dev_inst_free);
 187                 return NULL;
 188         }
 189
 190         /* Scan the USB device list for matching LWLA devices. */
 191         for (i = 0; i < num_devs; i++) {
 192                 sdi = dev_inst_new_matching(conn_devices, devlist[i]);
 193                 if (!sdi)
 194                         continue; /* no match */
 195
 196                 /* Register device instance with driver. */
 197                 devices = g_slist_append(devices, sdi);
 198         }
 199
 200         libusb_free_device_list(devlist, 1);
 201         g_slist_free_full(conn_devices, (GDestroyNotify)&sr_usb_dev_inst_free);
 202
 203         return std_scan_complete(di, devices);
 204 }
 205
 206 static void clear_helper(void *priv)
 207 {
 208         struct dev_context *devc;
 209
 210         devc = priv;
 211
 212         if (devc->acquisition) {
 213                 sr_err("Cannot clear device context during acquisition!");
 214                 return; /* Leak and pray. */
 215         }
 216
 217         g_free(devc);
 218 }
 219
 220 static int dev_clear(const struct sr_dev_driver *di)
 221 {
 222         return std_dev_clear_with_callback(di, clear_helper);
 223 }
 224
 225 /* Drain any pending data from the USB transfer buffers on the device.
 226  * This may be necessary e.g. after a crash or generally to clean up after
 227  * an abnormal condition.
 228  */
 229 static int drain_usb(struct sr_usb_dev_inst *usb, unsigned int endpoint)
 230 {
 231         int drained, xfer_len, ret;
 232         unsigned char buf[512];
 233         const unsigned int drain_timeout_ms = 10;
 234
 235         drained = 0;
 236         do {
 237                 xfer_len = 0;
 238                 ret = libusb_bulk_transfer(usb->devhdl, endpoint,
 239                                            buf, sizeof(buf), &xfer_len,
 240                                            drain_timeout_ms);
 241                 drained += xfer_len;
 242         } while (ret == LIBUSB_SUCCESS && xfer_len != 0);
 243
 244         if (ret != LIBUSB_SUCCESS && ret != LIBUSB_ERROR_TIMEOUT) {
 245                 sr_err("Failed to drain USB endpoint %u: %s.",
 246                        endpoint & (LIBUSB_ENDPOINT_IN - 1),
 247                        libusb_error_name(ret));
 248                 return SR_ERR;
 249         }
 250         if (drained > 0) {
 251                 sr_warn("Drained %d bytes from USB endpoint %u.",
 252                         drained, endpoint & (LIBUSB_ENDPOINT_IN - 1));
 253         }
 254
 255         return SR_OK;
 256 }
 257
 258 /* Open and initialize device.
 259  */
 260 static int dev_open(struct sr_dev_inst *sdi)
 261 {
 262         struct drv_context *drvc;
 263         struct dev_context *devc;
 264         struct sr_usb_dev_inst *usb;
 265         int i, ret;
 266
 267         drvc = sdi->driver->context;
 268         devc = sdi->priv;
 269         usb = sdi->conn;
 270
 271         /* Try the whole shebang three times, fingers crossed. */
 272         for (i = 0; i < 3; i++) {
 273                 ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 274                 if (ret != SR_OK)
 275                         return ret;
 276
 277                 ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 278                 if (ret != LIBUSB_SUCCESS) {
 279                         sr_err("Failed to set USB configuration: %s.",
 280                                 libusb_error_name(ret));
 281                         sr_usb_close(usb);
 282                         return SR_ERR;
 283                 }
 284
 285                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 286                 if (ret != LIBUSB_SUCCESS) {
 287                         sr_err("Failed to claim interface: %s.",
 288                                 libusb_error_name(ret));
 289                         sr_usb_close(usb);
 290                         return SR_ERR;
 291                 }
 292
 293                 ret = drain_usb(usb, EP_REPLY);
 294                 if (ret != SR_OK) {
 295                         sr_usb_close(usb);
 296                         return ret;
 297                 }
 298                 /* This delay appears to be necessary for reliable operation. */
 299                 g_usleep(30 * 1000);
 300
 301                 devc->active_fpga_config = FPGA_NOCONF;
 302                 devc->short_transfer_quirk = FALSE;
 303                 devc->state = STATE_IDLE;
 304
 305                 ret = (*devc->model->apply_fpga_config)(sdi);
 306
 307                 if (ret == SR_OK)
 308                         ret = (*devc->model->device_init_check)(sdi);
 309                 if (ret == SR_OK)
 310                         break;
 311
 312                 /* Rinse and repeat. */
 313                 sr_usb_close(usb);
 314         }
 315
 316         if (ret == SR_OK && devc->short_transfer_quirk)
 317                 sr_warn("Short transfer quirk detected! "
 318                         "Memory reads will be slow.");
 319         return ret;
 320 }
 321
 322 /* Shutdown and close device. */
 323 static int dev_close(struct sr_dev_inst *sdi)
 324 {
 325         struct dev_context *devc;
 326         struct sr_usb_dev_inst *usb;
 327         int ret;
 328
 329         devc = sdi->priv;
 330         usb = sdi->conn;
 331
 332         if (devc->acquisition) {
 333                 sr_err("Cannot close device during acquisition!");
 334                 /* Request stop, leak handle, and prepare for the worst. */
 335                 devc->cancel_requested = TRUE;
 336                 return SR_ERR_BUG;
 337         }
 338
 339         /* Download of the shutdown bitstream, if any. */
 340         ret = (*devc->model->apply_fpga_config)(sdi);
 341         if (ret != SR_OK)
 342                 sr_warn("Unable to shut down device.");
 343
 344         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 345
 346         sr_usb_close(usb);
 347
 348         return SR_OK;
 349 }
 350
 351 /* Check whether the device options contain a specific key.
 352  * Also match against get/set/list bits if specified.
 353  */
 354 static int has_devopt(const struct model_info *model, uint32_t key)
 355 {
 356         unsigned int i;
 357
 358         for (i = 0; i < model->num_devopts; i++) {
 359                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 360                         return TRUE;
 361         }
 362
 363         return FALSE;
 364 }
 365
 366 /* Read device configuration setting.
 367  */
 368 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 369                       const struct sr_channel_group *cg)
 370 {
 371         struct dev_context *devc;
 372         unsigned int idx;
 373
 374         (void)cg;
 375
 376         if (!sdi)
 377                 return SR_ERR_ARG;
 378
 379         devc = sdi->priv;
 380
 381         if (!has_devopt(devc->model, key | SR_CONF_GET))
 382                 return SR_ERR_NA;
 383
 384         switch (key) {
 385         case SR_CONF_SAMPLERATE:
 386                 *data = g_variant_new_uint64(devc->samplerate);
 387                 break;
 388         case SR_CONF_LIMIT_MSEC:
 389                 *data = g_variant_new_uint64(devc->limit_msec);
 390                 break;
 391         case SR_CONF_LIMIT_SAMPLES:
 392                 *data = g_variant_new_uint64(devc->limit_samples);
 393                 break;
 394         case SR_CONF_RLE:
 395                 *data = g_variant_new_boolean(devc->cfg_rle);
 396                 break;
 397         case SR_CONF_EXTERNAL_CLOCK:
 398                 *data = g_variant_new_boolean(devc->cfg_clock_source
 399                                                 == CLOCK_EXT_CLK);
 400                 break;
 401         case SR_CONF_CLOCK_EDGE:
 402                 idx = devc->cfg_clock_edge;
 403                 if (idx >= ARRAY_SIZE(signal_edge_names))
 404                         return SR_ERR_BUG;
 405                 *data = g_variant_new_string(signal_edge_names[idx]);
 406                 break;
 407         case SR_CONF_TRIGGER_SOURCE:
 408                 idx = devc->cfg_trigger_source;
 409                 if (idx >= ARRAY_SIZE(trigger_source_names))
 410                         return SR_ERR_BUG;
 411                 *data = g_variant_new_string(trigger_source_names[idx]);
 412                 break;
 413         case SR_CONF_TRIGGER_SLOPE:
 414                 idx = devc->cfg_trigger_slope;
 415                 if (idx >= ARRAY_SIZE(signal_edge_names))
 416                         return SR_ERR_BUG;
 417                 *data = g_variant_new_string(signal_edge_names[idx]);
 418                 break;
 419         default:
 420                 /* Must not happen for a key listed in devopts. */
 421                 return SR_ERR_BUG;
 422         }
 423
 424         return SR_OK;
 425 }
 426
 427 /* Helper for mapping a string-typed configuration value to an index
 428  * within a table of possible values.
 429  */
 430 static int lookup_index(GVariant *value, const char *const *table, int len)
 431 {
 432         const char *entry;
 433         int i;
 434
 435         entry = g_variant_get_string(value, NULL);
 436         if (!entry)
 437                 return -1;
 438
 439         /* Linear search is fine for very small tables. */
 440         for (i = 0; i < len; i++) {
 441                 if (strcmp(entry, table[i]) == 0)
 442                         return i;
 443         }
 444
 445         return -1;
 446 }
 447
 448 /* Write device configuration setting.
 449  */
 450 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 451                       const struct sr_channel_group *cg)
 452 {
 453         uint64_t value;
 454         struct dev_context *devc;
 455         int idx;
 456
 457         (void)cg;
 458
 459         if (!sdi)
 460                 return SR_ERR_ARG;
 461
 462         devc = sdi->priv;
 463
 464         if (!has_devopt(devc->model, key | SR_CONF_SET))
 465                 return SR_ERR_NA;
 466
 467         switch (key) {
 468         case SR_CONF_SAMPLERATE:
 469                 value = g_variant_get_uint64(data);
 470                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 471                                 || value > devc->model->samplerates[0])
 472                         return SR_ERR_SAMPLERATE;
 473                 devc->samplerate = value;
 474                 break;
 475         case SR_CONF_LIMIT_MSEC:
 476                 value = g_variant_get_uint64(data);
 477                 if (value > MAX_LIMIT_MSEC)
 478                         return SR_ERR_ARG;
 479                 devc->limit_msec = value;
 480                 break;
 481         case SR_CONF_LIMIT_SAMPLES:
 482                 value = g_variant_get_uint64(data);
 483                 if (value > MAX_LIMIT_SAMPLES)
 484                         return SR_ERR_ARG;
 485                 devc->limit_samples = value;
 486                 break;
 487         case SR_CONF_RLE:
 488                 devc->cfg_rle = g_variant_get_boolean(data);
 489                 break;
 490         case SR_CONF_EXTERNAL_CLOCK:
 491                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 492                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 493                 break;
 494         case SR_CONF_CLOCK_EDGE:
 495                 idx = lookup_index(data, signal_edge_names,
 496                                    ARRAY_SIZE(signal_edge_names));
 497                 if (idx < 0)
 498                         return SR_ERR_ARG;
 499                 devc->cfg_clock_edge = idx;
 500                 break;
 501         case SR_CONF_TRIGGER_SOURCE:
 502                 idx = lookup_index(data, trigger_source_names,
 503                                    ARRAY_SIZE(trigger_source_names));
 504                 if (idx < 0)
 505                         return SR_ERR_ARG;
 506                 devc->cfg_trigger_source = idx;
 507                 break;
 508         case SR_CONF_TRIGGER_SLOPE:
 509                 idx = lookup_index(data, signal_edge_names,
 510                                    ARRAY_SIZE(signal_edge_names));
 511                 if (idx < 0)
 512                         return SR_ERR_ARG;
 513                 devc->cfg_trigger_slope = idx;
 514                 break;
 515         default:
 516                 /* Must not happen for a key listed in devopts. */
 517                 return SR_ERR_BUG;
 518         }
 519
 520         return SR_OK;
 521 }
 522
 523 /* Apply channel configuration change.
 524  */
 525 static int config_channel_set(const struct sr_dev_inst *sdi,
 526                               struct sr_channel *ch, unsigned int changes)
 527 {
 528         uint64_t channel_bit;
 529         struct dev_context *devc;
 530
 531         if (!sdi)
 532                 return SR_ERR_ARG;
 533
 534         devc = sdi->priv;
 535
 536         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 537                 sr_err("Channel index %d out of range.", ch->index);
 538                 return SR_ERR_BUG;
 539         }
 540
 541         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 542                 channel_bit = UINT64_C(1) << ch->index;
 543
 544                 /* Enable or disable logic input for this channel. */
 545                 if (ch->enabled)
 546                         devc->channel_mask |= channel_bit;
 547                 else
 548                         devc->channel_mask &= ~channel_bit;
 549         }
 550
 551         return SR_OK;
 552 }
 553
 554 /* Derive trigger masks from the session's trigger configuration.
 555  */
 556 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 557 {
 558         uint64_t trigger_mask, trigger_values, trigger_edge_mask;
 559         uint64_t level_bit, type_bit;
 560         struct dev_context *devc;
 561         struct sr_trigger *trigger;
 562         struct sr_trigger_stage *stage;
 563         struct sr_trigger_match *match;
 564         const GSList *node;
 565         int idx;
 566         enum sr_trigger_matches trg;
 567
 568         devc = sdi->priv;
 569
 570         trigger = sr_session_trigger_get(sdi->session);
 571         if (!trigger || !trigger->stages)
 572                 return SR_OK;
 573
 574         if (trigger->stages->next) {
 575                 sr_err("This device only supports 1 trigger stage.");
 576                 return SR_ERR_ARG;
 577         }
 578         stage = trigger->stages->data;
 579
 580         trigger_mask = 0;
 581         trigger_values = 0;
 582         trigger_edge_mask = 0;
 583
 584         for (node = stage->matches; node; node = node->next) {
 585                 match = node->data;
 586
 587                 if (!match->channel->enabled)
 588                         continue; /* Ignore disabled channel. */
 589
 590                 idx = match->channel->index;
 591                 trg = match->match;
 592
 593                 if (idx < 0 || idx >= devc->model->num_channels) {
 594                         sr_err("Channel index %d out of range.", idx);
 595                         return SR_ERR_BUG; /* Should not happen. */
 596                 }
 597                 if (trg != SR_TRIGGER_ZERO
 598                                 && trg != SR_TRIGGER_ONE
 599                                 && trg != SR_TRIGGER_RISING
 600                                 && trg != SR_TRIGGER_FALLING) {
 601                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 602                         return SR_ERR_ARG;
 603                 }
 604                 level_bit = (trg == SR_TRIGGER_ONE
 605                         || trg == SR_TRIGGER_RISING) ? 1 : 0;
 606                 type_bit = (trg == SR_TRIGGER_RISING
 607                         || trg == SR_TRIGGER_FALLING) ? 1 : 0;
 608
 609                 trigger_mask |= UINT64_C(1) << idx;
 610                 trigger_values |= level_bit << idx;
 611                 trigger_edge_mask |= type_bit << idx;
 612         }
 613         devc->trigger_mask = trigger_mask;
 614         devc->trigger_values = trigger_values;
 615         devc->trigger_edge_mask = trigger_edge_mask;
 616
 617         return SR_OK;
 618 }
 619
 620 /* Apply current device configuration to the hardware.
 621  */
 622 static int config_commit(const struct sr_dev_inst *sdi)
 623 {
 624         struct dev_context *devc;
 625         int ret;
 626
 627         devc = sdi->priv;
 628
 629         if (devc->acquisition) {
 630                 sr_err("Acquisition still in progress?");
 631                 return SR_ERR;
 632         }
 633
 634         ret = prepare_trigger_masks(sdi);
 635         if (ret != SR_OK)
 636                 return ret;
 637
 638         ret = (*devc->model->apply_fpga_config)(sdi);
 639         if (ret != SR_OK) {
 640                 sr_err("Failed to apply FPGA configuration.");
 641                 return ret;
 642         }
 643
 644         return SR_OK;
 645 }
 646
 647 /* List available choices for a configuration setting.
 648  */
 649 static int config_list(uint32_t key, GVariant **data,
 650                        const struct sr_dev_inst *sdi,
 651                        const struct sr_channel_group *cg)
 652 {
 653         struct dev_context *devc;
 654         GVariant *gvar;
 655         GVariantBuilder gvb;
 656
 657         (void)cg;
 658
 659         if (key == SR_CONF_SCAN_OPTIONS) {
 660                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 661                         scanopts, ARRAY_SIZE(scanopts), sizeof(scanopts[0]));
 662                 return SR_OK;
 663         }
 664         if (!sdi) {
 665                 if (key != SR_CONF_DEVICE_OPTIONS)
 666                         return SR_ERR_ARG;
 667
 668                 /* List driver capabilities. */
 669                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 670                         drvopts, ARRAY_SIZE(drvopts), sizeof(drvopts[0]));
 671                 return SR_OK;
 672         }
 673
 674         devc = sdi->priv;
 675
 676         /* List the model's device options. */
 677         if (key == SR_CONF_DEVICE_OPTIONS) {
 678                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 679                         devc->model->devopts, devc->model->num_devopts,
 680                         sizeof(devc->model->devopts[0]));
 681                 return SR_OK;
 682         }
 683
 684         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 685                 return SR_ERR_NA;
 686
 687         switch (key) {
 688         case SR_CONF_SAMPLERATE:
 689                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_VARDICT);
 690                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 691                         devc->model->samplerates, devc->model->num_samplerates,
 692                         sizeof(devc->model->samplerates[0]));
 693                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 694                 *data = g_variant_builder_end(&gvb);
 695                 break;
 696         case SR_CONF_TRIGGER_MATCH:
 697                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 698                         trigger_matches, ARRAY_SIZE(trigger_matches),
 699                         sizeof(trigger_matches[0]));
 700                 break;
 701         case SR_CONF_TRIGGER_SOURCE:
 702                 *data = g_variant_new_strv(trigger_source_names,
 703                         ARRAY_SIZE(trigger_source_names));
 704                 break;
 705         case SR_CONF_TRIGGER_SLOPE:
 706         case SR_CONF_CLOCK_EDGE:
 707                 *data = g_variant_new_strv(signal_edge_names,
 708                         ARRAY_SIZE(signal_edge_names));
 709                 break;
 710         default:
 711                 /* Must not happen for a key listed in devopts. */
 712                 return SR_ERR_BUG;
 713         }
 714
 715         return SR_OK;
 716 }
 717
 718 /* Set up the device hardware to begin capturing samples as soon as the
 719  * configured trigger conditions are met, or immediately if no triggers
 720  * are configured.
 721  */
 722 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 723 {
 724         return lwla_start_acquisition(sdi);
 725 }
 726
 727 /* Request that a running capture operation be stopped.
 728  */
 729 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 730 {
 731         struct dev_context *devc;
 732
 733         devc = sdi->priv;
 734
 735         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 736                 devc->cancel_requested = TRUE;
 737                 sr_dbg("Requesting cancel.");
 738         }
 739
 740         return SR_OK;
 741 }
 742
 743 /* SysClk LWLA driver descriptor.
 744  */
 745 static struct sr_dev_driver sysclk_lwla_driver_info = {
 746         .name = "sysclk-lwla",
 747         .longname = "SysClk LWLA series",
 748         .api_version = 1,
 749         .init = std_init,
 750         .cleanup = std_cleanup,
 751         .scan = scan,
 752         .dev_list = std_dev_list,
 753         .dev_clear = dev_clear,
 754         .config_get = config_get,
 755         .config_set = config_set,
 756         .config_channel_set = config_channel_set,
 757         .config_commit = config_commit,
 758         .config_list = config_list,
 759         .dev_open = dev_open,
 760         .dev_close = dev_close,
 761         .dev_acquisition_start = dev_acquisition_start,
 762         .dev_acquisition_stop = dev_acquisition_stop,
 763         .context = NULL,
 764 };
 765 SR_REGISTER_DEV_DRIVER(sysclk_lwla_driver_info);