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