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 /* Initialize the SysClk LWLA driver.
  65  */
  66 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  67 {
  68         return std_init(sr_ctx, di, LOG_PREFIX);
  69 }
  70
  71 /* Create a new sigrok device instance for the indicated LWLA model.
  72  */
  73 static struct sr_dev_inst *dev_inst_new(const struct model_info *model)
  74 {
  75         struct sr_dev_inst *sdi;
  76         struct dev_context *devc;
  77         int i;
  78         char name[8];
  79
  80         /* Initialize private device context. */
  81         devc = g_malloc0(sizeof(struct dev_context));
  82         devc->model = model;
  83         devc->active_fpga_config = FPGA_NOCONF;
  84         devc->cfg_rle = TRUE;
  85         devc->samplerate = model->samplerates[0];
  86         devc->channel_mask = (UINT64_C(1) << model->num_channels) - 1;
  87
  88         /* Create sigrok device instance. */
  89         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  90         sdi->status = SR_ST_INACTIVE;
  91         sdi->vendor = g_strdup(VENDOR_NAME);
  92         sdi->model = g_strdup(model->name);
  93         sdi->priv = devc;
  94
  95         /* Generate list of logic channels. */
  96         for (i = 0; i < model->num_channels; i++) {
  97                 /* The LWLA series simply number channels from CH1 to CHxx. */
  98                 g_snprintf(name, sizeof(name), "CH%d", i + 1);
  99                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, name);
 100         }
 101
 102         return sdi;
 103 }
 104
 105 /* Create a new device instance for a libusb device if it is a SysClk LWLA
 106  * device and also matches the connection specification.
 107  */
 108 static struct sr_dev_inst *dev_inst_new_matching(GSList *conn_matches,
 109                                                  libusb_device *dev)
 110 {
 111         GSList *node;
 112         struct sr_usb_dev_inst *usb;
 113         const struct model_info *model;
 114         struct sr_dev_inst *sdi;
 115         struct libusb_device_descriptor des;
 116         int bus, address;
 117         unsigned int vid, pid;
 118         int ret;
 119
 120         bus = libusb_get_bus_number(dev);
 121         address = libusb_get_device_address(dev);
 122
 123         for (node = conn_matches; node != NULL; node = node->next) {
 124                 usb = node->data;
 125                 if (usb && usb->bus == bus && usb->address == address)
 126                         break; /* found */
 127         }
 128         if (conn_matches && !node)
 129                 return NULL; /* no match */
 130
 131         ret = libusb_get_device_descriptor(dev, &des);
 132         if (ret != 0) {
 133                 sr_err("Failed to get USB device descriptor: %s.",
 134                         libusb_error_name(ret));
 135                 return NULL;
 136         }
 137         vid = des.idVendor;
 138         pid = des.idProduct;
 139
 140         /* Create sigrok device instance. */
 141         if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1016) {
 142                 model = &lwla1016_info;
 143         } else if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1034) {
 144                 model = &lwla1034_info;
 145         } else {
 146                 if (conn_matches)
 147                         sr_warn("USB device %d.%d (%04x:%04x) is not a"
 148                                 " SysClk LWLA.", bus, address, vid, pid);
 149                 return NULL;
 150         }
 151         sdi = dev_inst_new(model);
 152
 153         sdi->inst_type = SR_INST_USB;
 154         sdi->conn = sr_usb_dev_inst_new(bus, address, NULL);
 155
 156         return sdi;
 157 }
 158
 159 /* Scan for SysClk LWLA devices and create a device instance for each one.
 160  */
 161 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 162 {
 163         GSList *conn_devices, *devices, *node;
 164         struct drv_context *drvc;
 165         struct sr_dev_inst *sdi;
 166         struct sr_config *src;
 167         const char *conn;
 168         libusb_device **devlist;
 169         ssize_t num_devs, i;
 170
 171         drvc = di->context;
 172         conn = NULL;
 173         conn_devices = NULL;
 174         devices = NULL;
 175
 176         for (node = options; node != NULL; node = node->next) {
 177                 src = node->data;
 178                 if (src->key == SR_CONF_CONN) {
 179                         conn = g_variant_get_string(src->data, NULL);
 180                         break;
 181                 }
 182         }
 183         if (conn) {
 184                 /* Find devices matching the connection specification. */
 185                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 186         }
 187
 188         /* List all libusb devices. */
 189         num_devs = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 190         if (num_devs < 0) {
 191                 sr_err("Failed to list USB devices: %s.",
 192                         libusb_error_name(num_devs));
 193                 g_slist_free_full(conn_devices,
 194                         (GDestroyNotify)&sr_usb_dev_inst_free);
 195                 return NULL;
 196         }
 197
 198         /* Scan the USB device list for matching LWLA devices. */
 199         for (i = 0; i < num_devs; i++) {
 200                 sdi = dev_inst_new_matching(conn_devices, devlist[i]);
 201                 if (!sdi)
 202                         continue; /* no match */
 203
 204                 /* Register device instance with driver. */
 205                 sdi->driver = di;
 206                 drvc->instances = g_slist_append(drvc->instances, sdi);
 207                 devices = g_slist_append(devices, sdi);
 208         }
 209
 210         libusb_free_device_list(devlist, 1);
 211         g_slist_free_full(conn_devices, (GDestroyNotify)&sr_usb_dev_inst_free);
 212
 213         return devices;
 214 }
 215
 216 /* Return the list of devices found during scan.
 217  */
 218 static GSList *dev_list(const struct sr_dev_driver *di)
 219 {
 220         struct drv_context *drvc;
 221
 222         drvc = di->context;
 223
 224         return drvc->instances;
 225 }
 226
 227 /* Destroy the private device context.
 228  */
 229 static void clear_dev_context(void *priv)
 230 {
 231         struct dev_context *devc;
 232
 233         devc = priv;
 234
 235         if (devc->acquisition) {
 236                 sr_err("Cannot clear device context during acquisition!");
 237                 return; /* leak and pray */
 238         }
 239         sr_dbg("Device context cleared.");
 240
 241         g_free(devc);
 242 }
 243
 244 /* Destroy all device instances.
 245  */
 246 static int dev_clear(const struct sr_dev_driver *di)
 247 {
 248         return std_dev_clear(di, &clear_dev_context);
 249 }
 250
 251 /* Open and initialize device.
 252  */
 253 static int dev_open(struct sr_dev_inst *sdi)
 254 {
 255         struct drv_context *drvc;
 256         struct dev_context *devc;
 257         struct sr_usb_dev_inst *usb;
 258         int ret;
 259
 260         drvc = sdi->driver->context;
 261         devc = sdi->priv;
 262         usb = sdi->conn;
 263
 264         if (!drvc) {
 265                 sr_err("Driver was not initialized.");
 266                 return SR_ERR;
 267         }
 268         if (sdi->status != SR_ST_INACTIVE) {
 269                 sr_err("Device already open.");
 270                 return SR_ERR;
 271         }
 272
 273         ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 274         if (ret != SR_OK)
 275                 return ret;
 276
 277         /* Set the configuration twice to trigger a lightweight reset.
 278          */
 279         ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 280         if (ret == 0)
 281                 ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 282         if (ret != 0) {
 283                 sr_err("Failed to set USB configuration: %s.",
 284                         libusb_error_name(ret));
 285                 sr_usb_close(usb);
 286                 return SR_ERR;
 287         }
 288
 289         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 290         if (ret < 0) {
 291                 sr_err("Failed to claim interface: %s.",
 292                         libusb_error_name(ret));
 293                 sr_usb_close(usb);
 294                 return SR_ERR;
 295         }
 296
 297         sdi->status = SR_ST_ACTIVE;
 298
 299         devc->active_fpga_config = FPGA_NOCONF;
 300         devc->state = STATE_IDLE;
 301
 302         ret = (*devc->model->apply_fpga_config)(sdi);
 303
 304         if (ret == SR_OK)
 305                 ret = (*devc->model->device_init_check)(sdi);
 306
 307         if (ret != SR_OK) {
 308                 sdi->status = SR_ST_INACTIVE;
 309                 sr_usb_close(usb);
 310         }
 311         return ret;
 312 }
 313
 314 /* Shutdown and close device.
 315  */
 316 static int dev_close(struct sr_dev_inst *sdi)
 317 {
 318         struct drv_context *drvc;
 319         struct dev_context *devc;
 320         struct sr_usb_dev_inst *usb;
 321         int ret;
 322
 323         drvc = sdi->driver->context;
 324         devc = sdi->priv;
 325         usb = sdi->conn;
 326
 327         if (!drvc) {
 328                 sr_err("Driver was not initialized.");
 329                 return SR_ERR;
 330         }
 331         if (sdi->status == SR_ST_INACTIVE) {
 332                 sr_dbg("Device already closed.");
 333                 return SR_OK;
 334         }
 335         if (devc->acquisition) {
 336                 sr_err("Cannot close device during acquisition!");
 337                 /* Request stop, leak handle, and prepare for the worst. */
 338                 devc->cancel_requested = TRUE;
 339                 return SR_ERR_BUG;
 340         }
 341
 342         sdi->status = SR_ST_INACTIVE;
 343
 344         /* Download of the shutdown bitstream, if any. */
 345         ret = (*devc->model->apply_fpga_config)(sdi);
 346         if (ret != SR_OK)
 347                 sr_warn("Unable to shut down device.");
 348
 349         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 350         sr_usb_close(usb);
 351
 352         return ret;
 353 }
 354
 355 /* Check whether the device options contain a specific key.
 356  * Also match against get/set/list bits if specified.
 357  */
 358 static int has_devopt(const struct model_info *model, uint32_t key)
 359 {
 360         unsigned int i;
 361
 362         for (i = 0; i < model->num_devopts; i++) {
 363                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 364                         return TRUE;
 365         }
 366         return FALSE;
 367 }
 368
 369 /* Read device configuration setting.
 370  */
 371 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 372                       const struct sr_channel_group *cg)
 373 {
 374         struct dev_context *devc;
 375         size_t idx;
 376
 377         (void)cg;
 378
 379         if (!sdi)
 380                 return SR_ERR_ARG;
 381
 382         devc = sdi->priv;
 383
 384         if (!has_devopt(devc->model, key | SR_CONF_GET))
 385                 return SR_ERR_NA;
 386
 387         switch (key) {
 388         case SR_CONF_SAMPLERATE:
 389                 *data = g_variant_new_uint64(devc->samplerate);
 390                 break;
 391         case SR_CONF_LIMIT_MSEC:
 392                 *data = g_variant_new_uint64(devc->limit_msec);
 393                 break;
 394         case SR_CONF_LIMIT_SAMPLES:
 395                 *data = g_variant_new_uint64(devc->limit_samples);
 396                 break;
 397         case SR_CONF_RLE:
 398                 *data = g_variant_new_boolean(devc->cfg_rle);
 399                 break;
 400         case SR_CONF_EXTERNAL_CLOCK:
 401                 *data = g_variant_new_boolean(devc->cfg_clock_source
 402                                                 == CLOCK_EXT_CLK);
 403                 break;
 404         case SR_CONF_CLOCK_EDGE:
 405                 idx = devc->cfg_clock_edge;
 406                 if (idx >= ARRAY_SIZE(signal_edge_names))
 407                         return SR_ERR_BUG;
 408                 *data = g_variant_new_string(signal_edge_names[idx]);
 409                 break;
 410         case SR_CONF_TRIGGER_SOURCE:
 411                 idx = devc->cfg_trigger_source;
 412                 if (idx >= ARRAY_SIZE(trigger_source_names))
 413                         return SR_ERR_BUG;
 414                 *data = g_variant_new_string(trigger_source_names[idx]);
 415                 break;
 416         case SR_CONF_TRIGGER_SLOPE:
 417                 idx = devc->cfg_trigger_slope;
 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         default:
 423                 /* Must not happen for a key listed in devopts. */
 424                 return SR_ERR_BUG;
 425         }
 426
 427         return SR_OK;
 428 }
 429
 430 /* Helper for mapping a string-typed configuration value to an index
 431  * within a table of possible values.
 432  */
 433 static int lookup_index(GVariant *value, const char *const *table, int len)
 434 {
 435         const char *entry;
 436         int i;
 437
 438         entry = g_variant_get_string(value, NULL);
 439         if (!entry)
 440                 return -1;
 441
 442         /* Linear search is fine for very small tables. */
 443         for (i = 0; i < len; ++i) {
 444                 if (strcmp(entry, table[i]) == 0)
 445                         return i;
 446         }
 447         return -1;
 448 }
 449
 450 /* Write device configuration setting.
 451  */
 452 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 453                       const struct sr_channel_group *cg)
 454 {
 455         uint64_t value;
 456         struct dev_context *devc;
 457         int idx;
 458
 459         (void)cg;
 460
 461         if (!sdi)
 462                 return SR_ERR_ARG;
 463
 464         devc = sdi->priv;
 465
 466         if (!has_devopt(devc->model, key | SR_CONF_SET))
 467                 return SR_ERR_NA;
 468
 469         switch (key) {
 470         case SR_CONF_SAMPLERATE:
 471                 value = g_variant_get_uint64(data);
 472                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 473                                 || value > devc->model->samplerates[0])
 474                         return SR_ERR_SAMPLERATE;
 475                 devc->samplerate = value;
 476                 break;
 477         case SR_CONF_LIMIT_MSEC:
 478                 value = g_variant_get_uint64(data);
 479                 if (value > MAX_LIMIT_MSEC)
 480                         return SR_ERR_ARG;
 481                 devc->limit_msec = value;
 482                 break;
 483         case SR_CONF_LIMIT_SAMPLES:
 484                 value = g_variant_get_uint64(data);
 485                 if (value > MAX_LIMIT_SAMPLES)
 486                         return SR_ERR_ARG;
 487                 devc->limit_samples = value;
 488                 break;
 489         case SR_CONF_RLE:
 490                 devc->cfg_rle = g_variant_get_boolean(data);
 491                 break;
 492         case SR_CONF_EXTERNAL_CLOCK:
 493                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 494                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 495                 break;
 496         case SR_CONF_CLOCK_EDGE:
 497                 idx = lookup_index(data, signal_edge_names,
 498                                    ARRAY_SIZE(signal_edge_names));
 499                 if (idx < 0)
 500                         return SR_ERR_ARG;
 501                 devc->cfg_clock_edge = idx;
 502                 break;
 503         case SR_CONF_TRIGGER_SOURCE:
 504                 idx = lookup_index(data, trigger_source_names,
 505                                    ARRAY_SIZE(trigger_source_names));
 506                 if (idx < 0)
 507                         return SR_ERR_ARG;
 508                 devc->cfg_trigger_source = idx;
 509                 break;
 510         case SR_CONF_TRIGGER_SLOPE:
 511                 idx = lookup_index(data, signal_edge_names,
 512                                    ARRAY_SIZE(signal_edge_names));
 513                 if (idx < 0)
 514                         return SR_ERR_ARG;
 515                 devc->cfg_trigger_slope = idx;
 516                 break;
 517         default:
 518                 /* Must not happen for a key listed in devopts. */
 519                 return SR_ERR_BUG;
 520         }
 521
 522         return SR_OK;
 523 }
 524
 525 /* Apply channel configuration change.
 526  */
 527 static int config_channel_set(const struct sr_dev_inst *sdi,
 528                               struct sr_channel *ch, unsigned int changes)
 529 {
 530         uint64_t channel_bit;
 531         struct dev_context *devc;
 532
 533         if (!sdi)
 534                 return SR_ERR_ARG;
 535
 536         devc = sdi->priv;
 537
 538         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 539                 sr_err("Channel index %d out of range.", ch->index);
 540                 return SR_ERR_BUG;
 541         }
 542
 543         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 544                 channel_bit = UINT64_C(1) << ch->index;
 545
 546                 /* Enable or disable logic input for this channel. */
 547                 if (ch->enabled)
 548                         devc->channel_mask |= channel_bit;
 549                 else
 550                         devc->channel_mask &= ~channel_bit;
 551         }
 552
 553         return SR_OK;
 554 }
 555
 556 /* Derive trigger masks from the session's trigger configuration.
 557  */
 558 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 559 {
 560         uint64_t trigger_mask;
 561         uint64_t trigger_values;
 562         uint64_t trigger_edge_mask;
 563         uint64_t channel_bit;
 564         struct dev_context *devc;
 565         struct sr_trigger *trigger;
 566         struct sr_trigger_stage *stage;
 567         struct sr_trigger_match *match;
 568         const GSList *node;
 569         int idx;
 570
 571         devc = sdi->priv;
 572
 573         trigger = sr_session_trigger_get(sdi->session);
 574         if (!trigger || !trigger->stages)
 575                 return SR_OK;
 576
 577         if (trigger->stages->next) {
 578                 sr_err("This device only supports 1 trigger stage.");
 579                 return SR_ERR_ARG;
 580         }
 581         stage = trigger->stages->data;
 582
 583         trigger_mask = 0;
 584         trigger_values = 0;
 585         trigger_edge_mask = 0;
 586
 587         for (node = stage->matches; node; node = node->next) {
 588                 match = node->data;
 589
 590                 if (!match->channel->enabled)
 591                         continue; /* ignore disabled channel */
 592
 593                 idx = match->channel->index;
 594
 595                 if (idx < 0 || idx >= devc->model->num_channels) {
 596                         sr_err("Channel index %d out of range.", idx);
 597                         return SR_ERR_BUG; /* should not happen */
 598                 }
 599                 channel_bit = UINT64_C(1) << idx;
 600                 trigger_mask |= channel_bit;
 601
 602                 switch (match->match) {
 603                 case SR_TRIGGER_ZERO:
 604                         break;
 605                 case SR_TRIGGER_ONE:
 606                         trigger_values |= channel_bit;
 607                         break;
 608                 case SR_TRIGGER_RISING:
 609                         trigger_values |= channel_bit;
 610                         /* Fall through for edge mask. */
 611                 case SR_TRIGGER_FALLING:
 612                         trigger_edge_mask |= channel_bit;
 613                         break;
 614                 default:
 615                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 616                         return SR_ERR_ARG;
 617                 }
 618         }
 619         devc->trigger_mask = trigger_mask;
 620         devc->trigger_values = trigger_values;
 621         devc->trigger_edge_mask = trigger_edge_mask;
 622
 623         return SR_OK;
 624 }
 625
 626 /* Apply current device configuration to the hardware.
 627  */
 628 static int config_commit(const struct sr_dev_inst *sdi)
 629 {
 630         struct dev_context *devc;
 631         int ret;
 632
 633         devc = sdi->priv;
 634
 635         if (sdi->status != SR_ST_ACTIVE)
 636                 return SR_ERR_DEV_CLOSED;
 637
 638         if (devc->acquisition) {
 639                 sr_err("Acquisition still in progress?");
 640                 return SR_ERR;
 641         }
 642
 643         ret = prepare_trigger_masks(sdi);
 644         if (ret != SR_OK)
 645                 return ret;
 646
 647         ret = (*devc->model->apply_fpga_config)(sdi);
 648         if (ret != SR_OK) {
 649                 sr_err("Failed to apply FPGA configuration.");
 650                 return ret;
 651         }
 652
 653         return SR_OK;
 654 }
 655
 656 /* List available choices for a configuration setting.
 657  */
 658 static int config_list(uint32_t key, GVariant **data,
 659                        const struct sr_dev_inst *sdi,
 660                        const struct sr_channel_group *cg)
 661 {
 662         struct dev_context *devc;
 663         GVariant *gvar;
 664         GVariantBuilder gvb;
 665
 666         (void)cg;
 667
 668         if (key == SR_CONF_SCAN_OPTIONS) {
 669                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 670                                                   scanopts, ARRAY_SIZE(scanopts),
 671                                                   sizeof(scanopts[0]));
 672                 return SR_OK;
 673         }
 674         if (!sdi) {
 675                 if (key != SR_CONF_DEVICE_OPTIONS)
 676                         return SR_ERR_ARG;
 677
 678                 /* List driver capabilities. */
 679                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 680                                                   drvopts, ARRAY_SIZE(drvopts),
 681                                                   sizeof(drvopts[0]));
 682                 return SR_OK;
 683         }
 684
 685         devc = sdi->priv;
 686
 687         /* List the model's device options. */
 688         if (key == SR_CONF_DEVICE_OPTIONS) {
 689                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 690                                                   devc->model->devopts,
 691                                                   devc->model->num_devopts,
 692                                                   sizeof(devc->model->devopts[0]));
 693                 return SR_OK;
 694         }
 695
 696         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 697                 return SR_ERR_NA;
 698
 699         switch (key) {
 700         case SR_CONF_SAMPLERATE:
 701                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_VARDICT);
 702                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 703                                                  devc->model->samplerates,
 704                                                  devc->model->num_samplerates,
 705                                                  sizeof(devc->model->samplerates[0]));
 706                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 707                 *data = g_variant_builder_end(&gvb);
 708                 break;
 709         case SR_CONF_TRIGGER_MATCH:
 710                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 711                                                   trigger_matches,
 712                                                   ARRAY_SIZE(trigger_matches),
 713                                                   sizeof(trigger_matches[0]));
 714                 break;
 715         case SR_CONF_TRIGGER_SOURCE:
 716                 *data = g_variant_new_strv(trigger_source_names,
 717                                            ARRAY_SIZE(trigger_source_names));
 718                 break;
 719         case SR_CONF_TRIGGER_SLOPE:
 720         case SR_CONF_CLOCK_EDGE:
 721                 *data = g_variant_new_strv(signal_edge_names,
 722                                            ARRAY_SIZE(signal_edge_names));
 723                 break;
 724         default:
 725                 /* Must not happen for a key listed in devopts. */
 726                 return SR_ERR_BUG;
 727         }
 728
 729         return SR_OK;
 730 }
 731
 732 /* Set up the device hardware to begin capturing samples as soon as the
 733  * configured trigger conditions are met, or immediately if no triggers
 734  * are configured.
 735  */
 736 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 737 {
 738         (void)cb_data;
 739
 740         if (sdi->status != SR_ST_ACTIVE)
 741                 return SR_ERR_DEV_CLOSED;
 742
 743         sr_info("Starting acquisition.");
 744
 745         return lwla_start_acquisition(sdi);
 746 }
 747
 748 /* Request that a running capture operation be stopped.
 749  */
 750 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 751 {
 752         struct dev_context *devc;
 753
 754         (void)cb_data;
 755         devc = sdi->priv;
 756
 757         if (sdi->status != SR_ST_ACTIVE)
 758                 return SR_ERR_DEV_CLOSED;
 759
 760         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 761                 devc->cancel_requested = TRUE;
 762                 sr_dbg("Stopping acquisition.");
 763         }
 764         return SR_OK;
 765 }
 766
 767 /* SysClk LWLA driver descriptor.
 768  */
 769 SR_PRIV struct sr_dev_driver sysclk_lwla_driver_info = {
 770         .name = "sysclk-lwla",
 771         .longname = "SysClk LWLA series",
 772         .api_version = 1,
 773         .init = init,
 774         .cleanup = dev_clear,
 775         .scan = scan,
 776         .dev_list = dev_list,
 777         .dev_clear = dev_clear,
 778         .config_get = config_get,
 779         .config_set = config_set,
 780         .config_channel_set = config_channel_set,
 781         .config_commit = config_commit,
 782         .config_list = config_list,
 783         .dev_open = dev_open,
 784         .dev_close = dev_close,
 785         .dev_acquisition_start = dev_acquisition_start,
 786         .dev_acquisition_stop = dev_acquisition_stop,
 787         .context = NULL,
 788 };