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 /* Destroy the private device context.
 207  */
 208 static void clear_dev_context(void *priv)
 209 {
 210         struct dev_context *devc;
 211
 212         devc = priv;
 213
 214         if (devc->acquisition) {
 215                 sr_err("Cannot clear device context during acquisition!");
 216                 return; /* Leak and pray. */
 217         }
 218         sr_dbg("Device context cleared.");
 219
 220         g_free(devc);
 221 }
 222
 223 /* Destroy all device instances.
 224  */
 225 static int dev_clear(const struct sr_dev_driver *di)
 226 {
 227         return std_dev_clear(di, &clear_dev_context);
 228 }
 229
 230 /* Drain any pending data from the USB transfer buffers on the device.
 231  * This may be necessary e.g. after a crash or generally to clean up after
 232  * an abnormal condition.
 233  */
 234 static int drain_usb(struct sr_usb_dev_inst *usb, unsigned int endpoint)
 235 {
 236         int drained, xfer_len, ret;
 237         unsigned char buf[512];
 238         const unsigned int drain_timeout_ms = 10;
 239
 240         drained = 0;
 241         do {
 242                 xfer_len = 0;
 243                 ret = libusb_bulk_transfer(usb->devhdl, endpoint,
 244                                            buf, sizeof(buf), &xfer_len,
 245                                            drain_timeout_ms);
 246                 drained += xfer_len;
 247         } while (ret == LIBUSB_SUCCESS && xfer_len != 0);
 248
 249         if (ret != LIBUSB_SUCCESS && ret != LIBUSB_ERROR_TIMEOUT) {
 250                 sr_err("Failed to drain USB endpoint %u: %s.",
 251                        endpoint & (LIBUSB_ENDPOINT_IN - 1),
 252                        libusb_error_name(ret));
 253                 return SR_ERR;
 254         }
 255         if (drained > 0) {
 256                 sr_warn("Drained %d bytes from USB endpoint %u.",
 257                         drained, endpoint & (LIBUSB_ENDPOINT_IN - 1));
 258         }
 259
 260         return SR_OK;
 261 }
 262
 263 /* Open and initialize device.
 264  */
 265 static int dev_open(struct sr_dev_inst *sdi)
 266 {
 267         struct drv_context *drvc;
 268         struct dev_context *devc;
 269         struct sr_usb_dev_inst *usb;
 270         int i, ret;
 271
 272         drvc = sdi->driver->context;
 273         devc = sdi->priv;
 274         usb = sdi->conn;
 275
 276         if (sdi->status != SR_ST_INACTIVE) {
 277                 sr_err("Device already open.");
 278                 return SR_ERR;
 279         }
 280
 281         /* Try the whole shebang three times, fingers crossed. */
 282         for (i = 0; i < 3; i++) {
 283                 ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 284                 if (ret != SR_OK)
 285                         return ret;
 286
 287                 ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 288                 if (ret != LIBUSB_SUCCESS) {
 289                         sr_err("Failed to set USB configuration: %s.",
 290                                 libusb_error_name(ret));
 291                         sr_usb_close(usb);
 292                         return SR_ERR;
 293                 }
 294
 295                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 296                 if (ret != LIBUSB_SUCCESS) {
 297                         sr_err("Failed to claim interface: %s.",
 298                                 libusb_error_name(ret));
 299                         sr_usb_close(usb);
 300                         return SR_ERR;
 301                 }
 302
 303                 ret = drain_usb(usb, EP_REPLY);
 304                 if (ret != SR_OK) {
 305                         sr_usb_close(usb);
 306                         return ret;
 307                 }
 308                 /* This delay appears to be necessary for reliable operation. */
 309                 g_usleep(30 * 1000);
 310
 311                 sdi->status = SR_ST_ACTIVE;
 312
 313                 devc->active_fpga_config = FPGA_NOCONF;
 314                 devc->short_transfer_quirk = FALSE;
 315                 devc->state = STATE_IDLE;
 316
 317                 ret = (*devc->model->apply_fpga_config)(sdi);
 318
 319                 if (ret == SR_OK)
 320                         ret = (*devc->model->device_init_check)(sdi);
 321                 if (ret == SR_OK)
 322                         break;
 323
 324                 /* Rinse and repeat. */
 325                 sdi->status = SR_ST_INACTIVE;
 326                 sr_usb_close(usb);
 327         }
 328
 329         if (ret == SR_OK && devc->short_transfer_quirk)
 330                 sr_warn("Short transfer quirk detected! "
 331                         "Memory reads will be slow.");
 332         return ret;
 333 }
 334
 335 /* Shutdown and close device.
 336  */
 337 static int dev_close(struct sr_dev_inst *sdi)
 338 {
 339         struct dev_context *devc;
 340         struct sr_usb_dev_inst *usb;
 341         int ret;
 342
 343         devc = sdi->priv;
 344         usb = sdi->conn;
 345
 346         if (devc->acquisition) {
 347                 sr_err("Cannot close device during acquisition!");
 348                 /* Request stop, leak handle, and prepare for the worst. */
 349                 devc->cancel_requested = TRUE;
 350                 return SR_ERR_BUG;
 351         }
 352
 353         sdi->status = SR_ST_INACTIVE;
 354
 355         /* Download of the shutdown bitstream, if any. */
 356         ret = (*devc->model->apply_fpga_config)(sdi);
 357         if (ret != SR_OK)
 358                 sr_warn("Unable to shut down device.");
 359
 360         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 361         sr_usb_close(usb);
 362
 363         return ret;
 364 }
 365
 366 /* Check whether the device options contain a specific key.
 367  * Also match against get/set/list bits if specified.
 368  */
 369 static int has_devopt(const struct model_info *model, uint32_t key)
 370 {
 371         unsigned int i;
 372
 373         for (i = 0; i < model->num_devopts; i++) {
 374                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 375                         return TRUE;
 376         }
 377
 378         return FALSE;
 379 }
 380
 381 /* Read device configuration setting.
 382  */
 383 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 384                       const struct sr_channel_group *cg)
 385 {
 386         struct dev_context *devc;
 387         unsigned int idx;
 388
 389         (void)cg;
 390
 391         if (!sdi)
 392                 return SR_ERR_ARG;
 393
 394         devc = sdi->priv;
 395
 396         if (!has_devopt(devc->model, key | SR_CONF_GET))
 397                 return SR_ERR_NA;
 398
 399         switch (key) {
 400         case SR_CONF_SAMPLERATE:
 401                 *data = g_variant_new_uint64(devc->samplerate);
 402                 break;
 403         case SR_CONF_LIMIT_MSEC:
 404                 *data = g_variant_new_uint64(devc->limit_msec);
 405                 break;
 406         case SR_CONF_LIMIT_SAMPLES:
 407                 *data = g_variant_new_uint64(devc->limit_samples);
 408                 break;
 409         case SR_CONF_RLE:
 410                 *data = g_variant_new_boolean(devc->cfg_rle);
 411                 break;
 412         case SR_CONF_EXTERNAL_CLOCK:
 413                 *data = g_variant_new_boolean(devc->cfg_clock_source
 414                                                 == CLOCK_EXT_CLK);
 415                 break;
 416         case SR_CONF_CLOCK_EDGE:
 417                 idx = devc->cfg_clock_edge;
 418                 if (idx >= ARRAY_SIZE(signal_edge_names))
 419                         return SR_ERR_BUG;
 420                 *data = g_variant_new_string(signal_edge_names[idx]);
 421                 break;
 422         case SR_CONF_TRIGGER_SOURCE:
 423                 idx = devc->cfg_trigger_source;
 424                 if (idx >= ARRAY_SIZE(trigger_source_names))
 425                         return SR_ERR_BUG;
 426                 *data = g_variant_new_string(trigger_source_names[idx]);
 427                 break;
 428         case SR_CONF_TRIGGER_SLOPE:
 429                 idx = devc->cfg_trigger_slope;
 430                 if (idx >= ARRAY_SIZE(signal_edge_names))
 431                         return SR_ERR_BUG;
 432                 *data = g_variant_new_string(signal_edge_names[idx]);
 433                 break;
 434         default:
 435                 /* Must not happen for a key listed in devopts. */
 436                 return SR_ERR_BUG;
 437         }
 438
 439         return SR_OK;
 440 }
 441
 442 /* Helper for mapping a string-typed configuration value to an index
 443  * within a table of possible values.
 444  */
 445 static int lookup_index(GVariant *value, const char *const *table, int len)
 446 {
 447         const char *entry;
 448         int i;
 449
 450         entry = g_variant_get_string(value, NULL);
 451         if (!entry)
 452                 return -1;
 453
 454         /* Linear search is fine for very small tables. */
 455         for (i = 0; i < len; i++) {
 456                 if (strcmp(entry, table[i]) == 0)
 457                         return i;
 458         }
 459
 460         return -1;
 461 }
 462
 463 /* Write device configuration setting.
 464  */
 465 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 466                       const struct sr_channel_group *cg)
 467 {
 468         uint64_t value;
 469         struct dev_context *devc;
 470         int idx;
 471
 472         (void)cg;
 473
 474         if (!sdi)
 475                 return SR_ERR_ARG;
 476
 477         devc = sdi->priv;
 478
 479         if (!has_devopt(devc->model, key | SR_CONF_SET))
 480                 return SR_ERR_NA;
 481
 482         switch (key) {
 483         case SR_CONF_SAMPLERATE:
 484                 value = g_variant_get_uint64(data);
 485                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 486                                 || value > devc->model->samplerates[0])
 487                         return SR_ERR_SAMPLERATE;
 488                 devc->samplerate = value;
 489                 break;
 490         case SR_CONF_LIMIT_MSEC:
 491                 value = g_variant_get_uint64(data);
 492                 if (value > MAX_LIMIT_MSEC)
 493                         return SR_ERR_ARG;
 494                 devc->limit_msec = value;
 495                 break;
 496         case SR_CONF_LIMIT_SAMPLES:
 497                 value = g_variant_get_uint64(data);
 498                 if (value > MAX_LIMIT_SAMPLES)
 499                         return SR_ERR_ARG;
 500                 devc->limit_samples = value;
 501                 break;
 502         case SR_CONF_RLE:
 503                 devc->cfg_rle = g_variant_get_boolean(data);
 504                 break;
 505         case SR_CONF_EXTERNAL_CLOCK:
 506                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 507                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 508                 break;
 509         case SR_CONF_CLOCK_EDGE:
 510                 idx = lookup_index(data, signal_edge_names,
 511                                    ARRAY_SIZE(signal_edge_names));
 512                 if (idx < 0)
 513                         return SR_ERR_ARG;
 514                 devc->cfg_clock_edge = idx;
 515                 break;
 516         case SR_CONF_TRIGGER_SOURCE:
 517                 idx = lookup_index(data, trigger_source_names,
 518                                    ARRAY_SIZE(trigger_source_names));
 519                 if (idx < 0)
 520                         return SR_ERR_ARG;
 521                 devc->cfg_trigger_source = idx;
 522                 break;
 523         case SR_CONF_TRIGGER_SLOPE:
 524                 idx = lookup_index(data, signal_edge_names,
 525                                    ARRAY_SIZE(signal_edge_names));
 526                 if (idx < 0)
 527                         return SR_ERR_ARG;
 528                 devc->cfg_trigger_slope = idx;
 529                 break;
 530         default:
 531                 /* Must not happen for a key listed in devopts. */
 532                 return SR_ERR_BUG;
 533         }
 534
 535         return SR_OK;
 536 }
 537
 538 /* Apply channel configuration change.
 539  */
 540 static int config_channel_set(const struct sr_dev_inst *sdi,
 541                               struct sr_channel *ch, unsigned int changes)
 542 {
 543         uint64_t channel_bit;
 544         struct dev_context *devc;
 545
 546         if (!sdi)
 547                 return SR_ERR_ARG;
 548
 549         devc = sdi->priv;
 550
 551         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 552                 sr_err("Channel index %d out of range.", ch->index);
 553                 return SR_ERR_BUG;
 554         }
 555
 556         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 557                 channel_bit = UINT64_C(1) << ch->index;
 558
 559                 /* Enable or disable logic input for this channel. */
 560                 if (ch->enabled)
 561                         devc->channel_mask |= channel_bit;
 562                 else
 563                         devc->channel_mask &= ~channel_bit;
 564         }
 565
 566         return SR_OK;
 567 }
 568
 569 /* Derive trigger masks from the session's trigger configuration.
 570  */
 571 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 572 {
 573         uint64_t trigger_mask, trigger_values, trigger_edge_mask;
 574         uint64_t level_bit, type_bit;
 575         struct dev_context *devc;
 576         struct sr_trigger *trigger;
 577         struct sr_trigger_stage *stage;
 578         struct sr_trigger_match *match;
 579         const GSList *node;
 580         int idx;
 581         enum sr_trigger_matches trg;
 582
 583         devc = sdi->priv;
 584
 585         trigger = sr_session_trigger_get(sdi->session);
 586         if (!trigger || !trigger->stages)
 587                 return SR_OK;
 588
 589         if (trigger->stages->next) {
 590                 sr_err("This device only supports 1 trigger stage.");
 591                 return SR_ERR_ARG;
 592         }
 593         stage = trigger->stages->data;
 594
 595         trigger_mask = 0;
 596         trigger_values = 0;
 597         trigger_edge_mask = 0;
 598
 599         for (node = stage->matches; node; node = node->next) {
 600                 match = node->data;
 601
 602                 if (!match->channel->enabled)
 603                         continue; /* Ignore disabled channel. */
 604
 605                 idx = match->channel->index;
 606                 trg = match->match;
 607
 608                 if (idx < 0 || idx >= devc->model->num_channels) {
 609                         sr_err("Channel index %d out of range.", idx);
 610                         return SR_ERR_BUG; /* Should not happen. */
 611                 }
 612                 if (trg != SR_TRIGGER_ZERO
 613                                 && trg != SR_TRIGGER_ONE
 614                                 && trg != SR_TRIGGER_RISING
 615                                 && trg != SR_TRIGGER_FALLING) {
 616                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 617                         return SR_ERR_ARG;
 618                 }
 619                 level_bit = (trg == SR_TRIGGER_ONE
 620                         || trg == SR_TRIGGER_RISING) ? 1 : 0;
 621                 type_bit = (trg == SR_TRIGGER_RISING
 622                         || trg == SR_TRIGGER_FALLING) ? 1 : 0;
 623
 624                 trigger_mask |= UINT64_C(1) << idx;
 625                 trigger_values |= level_bit << idx;
 626                 trigger_edge_mask |= type_bit << idx;
 627         }
 628         devc->trigger_mask = trigger_mask;
 629         devc->trigger_values = trigger_values;
 630         devc->trigger_edge_mask = trigger_edge_mask;
 631
 632         return SR_OK;
 633 }
 634
 635 /* Apply current device configuration to the hardware.
 636  */
 637 static int config_commit(const struct sr_dev_inst *sdi)
 638 {
 639         struct dev_context *devc;
 640         int ret;
 641
 642         devc = sdi->priv;
 643
 644         if (devc->acquisition) {
 645                 sr_err("Acquisition still in progress?");
 646                 return SR_ERR;
 647         }
 648
 649         ret = prepare_trigger_masks(sdi);
 650         if (ret != SR_OK)
 651                 return ret;
 652
 653         ret = (*devc->model->apply_fpga_config)(sdi);
 654         if (ret != SR_OK) {
 655                 sr_err("Failed to apply FPGA configuration.");
 656                 return ret;
 657         }
 658
 659         return SR_OK;
 660 }
 661
 662 /* List available choices for a configuration setting.
 663  */
 664 static int config_list(uint32_t key, GVariant **data,
 665                        const struct sr_dev_inst *sdi,
 666                        const struct sr_channel_group *cg)
 667 {
 668         struct dev_context *devc;
 669         GVariant *gvar;
 670         GVariantBuilder gvb;
 671
 672         (void)cg;
 673
 674         if (key == SR_CONF_SCAN_OPTIONS) {
 675                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 676                         scanopts, ARRAY_SIZE(scanopts), sizeof(scanopts[0]));
 677                 return SR_OK;
 678         }
 679         if (!sdi) {
 680                 if (key != SR_CONF_DEVICE_OPTIONS)
 681                         return SR_ERR_ARG;
 682
 683                 /* List driver capabilities. */
 684                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 685                         drvopts, ARRAY_SIZE(drvopts), sizeof(drvopts[0]));
 686                 return SR_OK;
 687         }
 688
 689         devc = sdi->priv;
 690
 691         /* List the model's device options. */
 692         if (key == SR_CONF_DEVICE_OPTIONS) {
 693                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 694                         devc->model->devopts, devc->model->num_devopts,
 695                         sizeof(devc->model->devopts[0]));
 696                 return SR_OK;
 697         }
 698
 699         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 700                 return SR_ERR_NA;
 701
 702         switch (key) {
 703         case SR_CONF_SAMPLERATE:
 704                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_VARDICT);
 705                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 706                         devc->model->samplerates, devc->model->num_samplerates,
 707                         sizeof(devc->model->samplerates[0]));
 708                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 709                 *data = g_variant_builder_end(&gvb);
 710                 break;
 711         case SR_CONF_TRIGGER_MATCH:
 712                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 713                         trigger_matches, ARRAY_SIZE(trigger_matches),
 714                         sizeof(trigger_matches[0]));
 715                 break;
 716         case SR_CONF_TRIGGER_SOURCE:
 717                 *data = g_variant_new_strv(trigger_source_names,
 718                         ARRAY_SIZE(trigger_source_names));
 719                 break;
 720         case SR_CONF_TRIGGER_SLOPE:
 721         case SR_CONF_CLOCK_EDGE:
 722                 *data = g_variant_new_strv(signal_edge_names,
 723                         ARRAY_SIZE(signal_edge_names));
 724                 break;
 725         default:
 726                 /* Must not happen for a key listed in devopts. */
 727                 return SR_ERR_BUG;
 728         }
 729
 730         return SR_OK;
 731 }
 732
 733 /* Set up the device hardware to begin capturing samples as soon as the
 734  * configured trigger conditions are met, or immediately if no triggers
 735  * are configured.
 736  */
 737 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 738 {
 739         return lwla_start_acquisition(sdi);
 740 }
 741
 742 /* Request that a running capture operation be stopped.
 743  */
 744 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 745 {
 746         struct dev_context *devc;
 747
 748         devc = sdi->priv;
 749
 750         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 751                 devc->cancel_requested = TRUE;
 752                 sr_dbg("Requesting cancel.");
 753         }
 754
 755         return SR_OK;
 756 }
 757
 758 /* SysClk LWLA driver descriptor.
 759  */
 760 static struct sr_dev_driver sysclk_lwla_driver_info = {
 761         .name = "sysclk-lwla",
 762         .longname = "SysClk LWLA series",
 763         .api_version = 1,
 764         .init = std_init,
 765         .cleanup = std_cleanup,
 766         .scan = scan,
 767         .dev_list = std_dev_list,
 768         .dev_clear = dev_clear,
 769         .config_get = config_get,
 770         .config_set = config_set,
 771         .config_channel_set = config_channel_set,
 772         .config_commit = config_commit,
 773         .config_list = config_list,
 774         .dev_open = dev_open,
 775         .dev_close = dev_close,
 776         .dev_acquisition_start = dev_acquisition_start,
 777         .dev_acquisition_stop = dev_acquisition_stop,
 778         .context = NULL,
 779 };
 780 SR_REGISTER_DEV_DRIVER(sysclk_lwla_driver_info);