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 /* Drain any pending data from the USB transfer buffers on the device.
 252  * This may be necessary e.g. after a crash or generally to clean up after
 253  * an abnormal condition.
 254  */
 255 static int drain_usb(struct sr_usb_dev_inst *usb, unsigned int endpoint)
 256 {
 257         int drained, xfer_len;
 258         int ret;
 259         unsigned char buf[512];
 260
 261         const unsigned int drain_timeout_ms = 10;
 262
 263         drained = 0;
 264         do {
 265                 xfer_len = 0;
 266                 ret = libusb_bulk_transfer(usb->devhdl, endpoint,
 267                                            buf, sizeof(buf), &xfer_len,
 268                                            drain_timeout_ms);
 269                 drained += xfer_len;
 270         } while (ret == LIBUSB_SUCCESS && xfer_len != 0);
 271
 272         if (ret != LIBUSB_SUCCESS && ret != LIBUSB_ERROR_TIMEOUT) {
 273                 sr_err("Failed to drain USB endpoint %u: %s.",
 274                        endpoint & (LIBUSB_ENDPOINT_IN - 1),
 275                        libusb_error_name(ret));
 276                 return SR_ERR;
 277         }
 278         if (drained > 0) {
 279                 sr_warn("Drained %d bytes from USB endpoint %u.",
 280                         drained, endpoint & (LIBUSB_ENDPOINT_IN - 1));
 281         }
 282         return SR_OK;
 283 }
 284
 285 /* Open and initialize device.
 286  */
 287 static int dev_open(struct sr_dev_inst *sdi)
 288 {
 289         struct drv_context *drvc;
 290         struct dev_context *devc;
 291         struct sr_usb_dev_inst *usb;
 292         int ret;
 293
 294         drvc = sdi->driver->context;
 295         devc = sdi->priv;
 296         usb = sdi->conn;
 297
 298         if (!drvc) {
 299                 sr_err("Driver was not initialized.");
 300                 return SR_ERR;
 301         }
 302         if (sdi->status != SR_ST_INACTIVE) {
 303                 sr_err("Device already open.");
 304                 return SR_ERR;
 305         }
 306
 307         ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 308         if (ret != SR_OK)
 309                 return ret;
 310
 311         ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 312         if (ret != LIBUSB_SUCCESS) {
 313                 sr_err("Failed to set USB configuration: %s.",
 314                         libusb_error_name(ret));
 315                 sr_usb_close(usb);
 316                 return SR_ERR;
 317         }
 318
 319         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 320         if (ret != LIBUSB_SUCCESS) {
 321                 sr_err("Failed to claim interface: %s.",
 322                         libusb_error_name(ret));
 323                 sr_usb_close(usb);
 324                 return SR_ERR;
 325         }
 326
 327         ret = drain_usb(usb, EP_REPLY);
 328         if (ret != SR_OK)
 329                 return ret;
 330
 331         sdi->status = SR_ST_ACTIVE;
 332
 333         devc->active_fpga_config = FPGA_NOCONF;
 334         devc->state = STATE_IDLE;
 335
 336         ret = (*devc->model->apply_fpga_config)(sdi);
 337
 338         if (ret == SR_OK)
 339                 ret = (*devc->model->device_init_check)(sdi);
 340
 341         if (ret != SR_OK) {
 342                 sdi->status = SR_ST_INACTIVE;
 343                 sr_usb_close(usb);
 344         }
 345         return ret;
 346 }
 347
 348 /* Shutdown and close device.
 349  */
 350 static int dev_close(struct sr_dev_inst *sdi)
 351 {
 352         struct drv_context *drvc;
 353         struct dev_context *devc;
 354         struct sr_usb_dev_inst *usb;
 355         int ret;
 356
 357         drvc = sdi->driver->context;
 358         devc = sdi->priv;
 359         usb = sdi->conn;
 360
 361         if (!drvc) {
 362                 sr_err("Driver was not initialized.");
 363                 return SR_ERR;
 364         }
 365         if (sdi->status == SR_ST_INACTIVE) {
 366                 sr_dbg("Device already closed.");
 367                 return SR_OK;
 368         }
 369         if (devc->acquisition) {
 370                 sr_err("Cannot close device during acquisition!");
 371                 /* Request stop, leak handle, and prepare for the worst. */
 372                 devc->cancel_requested = TRUE;
 373                 return SR_ERR_BUG;
 374         }
 375
 376         sdi->status = SR_ST_INACTIVE;
 377
 378         /* Download of the shutdown bitstream, if any. */
 379         ret = (*devc->model->apply_fpga_config)(sdi);
 380         if (ret != SR_OK)
 381                 sr_warn("Unable to shut down device.");
 382
 383         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 384         sr_usb_close(usb);
 385
 386         return ret;
 387 }
 388
 389 /* Check whether the device options contain a specific key.
 390  * Also match against get/set/list bits if specified.
 391  */
 392 static int has_devopt(const struct model_info *model, uint32_t key)
 393 {
 394         unsigned int i;
 395
 396         for (i = 0; i < model->num_devopts; i++) {
 397                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 398                         return TRUE;
 399         }
 400         return FALSE;
 401 }
 402
 403 /* Read device configuration setting.
 404  */
 405 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 406                       const struct sr_channel_group *cg)
 407 {
 408         struct dev_context *devc;
 409         unsigned int idx;
 410
 411         (void)cg;
 412
 413         if (!sdi)
 414                 return SR_ERR_ARG;
 415
 416         devc = sdi->priv;
 417
 418         if (!has_devopt(devc->model, key | SR_CONF_GET))
 419                 return SR_ERR_NA;
 420
 421         switch (key) {
 422         case SR_CONF_SAMPLERATE:
 423                 *data = g_variant_new_uint64(devc->samplerate);
 424                 break;
 425         case SR_CONF_LIMIT_MSEC:
 426                 *data = g_variant_new_uint64(devc->limit_msec);
 427                 break;
 428         case SR_CONF_LIMIT_SAMPLES:
 429                 *data = g_variant_new_uint64(devc->limit_samples);
 430                 break;
 431         case SR_CONF_RLE:
 432                 *data = g_variant_new_boolean(devc->cfg_rle);
 433                 break;
 434         case SR_CONF_EXTERNAL_CLOCK:
 435                 *data = g_variant_new_boolean(devc->cfg_clock_source
 436                                                 == CLOCK_EXT_CLK);
 437                 break;
 438         case SR_CONF_CLOCK_EDGE:
 439                 idx = devc->cfg_clock_edge;
 440                 if (idx >= ARRAY_SIZE(signal_edge_names))
 441                         return SR_ERR_BUG;
 442                 *data = g_variant_new_string(signal_edge_names[idx]);
 443                 break;
 444         case SR_CONF_TRIGGER_SOURCE:
 445                 idx = devc->cfg_trigger_source;
 446                 if (idx >= ARRAY_SIZE(trigger_source_names))
 447                         return SR_ERR_BUG;
 448                 *data = g_variant_new_string(trigger_source_names[idx]);
 449                 break;
 450         case SR_CONF_TRIGGER_SLOPE:
 451                 idx = devc->cfg_trigger_slope;
 452                 if (idx >= ARRAY_SIZE(signal_edge_names))
 453                         return SR_ERR_BUG;
 454                 *data = g_variant_new_string(signal_edge_names[idx]);
 455                 break;
 456         default:
 457                 /* Must not happen for a key listed in devopts. */
 458                 return SR_ERR_BUG;
 459         }
 460
 461         return SR_OK;
 462 }
 463
 464 /* Helper for mapping a string-typed configuration value to an index
 465  * within a table of possible values.
 466  */
 467 static int lookup_index(GVariant *value, const char *const *table, int len)
 468 {
 469         const char *entry;
 470         int i;
 471
 472         entry = g_variant_get_string(value, NULL);
 473         if (!entry)
 474                 return -1;
 475
 476         /* Linear search is fine for very small tables. */
 477         for (i = 0; i < len; ++i) {
 478                 if (strcmp(entry, table[i]) == 0)
 479                         return i;
 480         }
 481         return -1;
 482 }
 483
 484 /* Write device configuration setting.
 485  */
 486 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 487                       const struct sr_channel_group *cg)
 488 {
 489         uint64_t value;
 490         struct dev_context *devc;
 491         int idx;
 492
 493         (void)cg;
 494
 495         if (!sdi)
 496                 return SR_ERR_ARG;
 497
 498         devc = sdi->priv;
 499
 500         if (!has_devopt(devc->model, key | SR_CONF_SET))
 501                 return SR_ERR_NA;
 502
 503         switch (key) {
 504         case SR_CONF_SAMPLERATE:
 505                 value = g_variant_get_uint64(data);
 506                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 507                                 || value > devc->model->samplerates[0])
 508                         return SR_ERR_SAMPLERATE;
 509                 devc->samplerate = value;
 510                 break;
 511         case SR_CONF_LIMIT_MSEC:
 512                 value = g_variant_get_uint64(data);
 513                 if (value > MAX_LIMIT_MSEC)
 514                         return SR_ERR_ARG;
 515                 devc->limit_msec = value;
 516                 break;
 517         case SR_CONF_LIMIT_SAMPLES:
 518                 value = g_variant_get_uint64(data);
 519                 if (value > MAX_LIMIT_SAMPLES)
 520                         return SR_ERR_ARG;
 521                 devc->limit_samples = value;
 522                 break;
 523         case SR_CONF_RLE:
 524                 devc->cfg_rle = g_variant_get_boolean(data);
 525                 break;
 526         case SR_CONF_EXTERNAL_CLOCK:
 527                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 528                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 529                 break;
 530         case SR_CONF_CLOCK_EDGE:
 531                 idx = lookup_index(data, signal_edge_names,
 532                                    ARRAY_SIZE(signal_edge_names));
 533                 if (idx < 0)
 534                         return SR_ERR_ARG;
 535                 devc->cfg_clock_edge = idx;
 536                 break;
 537         case SR_CONF_TRIGGER_SOURCE:
 538                 idx = lookup_index(data, trigger_source_names,
 539                                    ARRAY_SIZE(trigger_source_names));
 540                 if (idx < 0)
 541                         return SR_ERR_ARG;
 542                 devc->cfg_trigger_source = idx;
 543                 break;
 544         case SR_CONF_TRIGGER_SLOPE:
 545                 idx = lookup_index(data, signal_edge_names,
 546                                    ARRAY_SIZE(signal_edge_names));
 547                 if (idx < 0)
 548                         return SR_ERR_ARG;
 549                 devc->cfg_trigger_slope = idx;
 550                 break;
 551         default:
 552                 /* Must not happen for a key listed in devopts. */
 553                 return SR_ERR_BUG;
 554         }
 555
 556         return SR_OK;
 557 }
 558
 559 /* Apply channel configuration change.
 560  */
 561 static int config_channel_set(const struct sr_dev_inst *sdi,
 562                               struct sr_channel *ch, unsigned int changes)
 563 {
 564         uint64_t channel_bit;
 565         struct dev_context *devc;
 566
 567         if (!sdi)
 568                 return SR_ERR_ARG;
 569
 570         devc = sdi->priv;
 571
 572         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 573                 sr_err("Channel index %d out of range.", ch->index);
 574                 return SR_ERR_BUG;
 575         }
 576
 577         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 578                 channel_bit = UINT64_C(1) << ch->index;
 579
 580                 /* Enable or disable logic input for this channel. */
 581                 if (ch->enabled)
 582                         devc->channel_mask |= channel_bit;
 583                 else
 584                         devc->channel_mask &= ~channel_bit;
 585         }
 586
 587         return SR_OK;
 588 }
 589
 590 /* Derive trigger masks from the session's trigger configuration.
 591  */
 592 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 593 {
 594         uint64_t trigger_mask;
 595         uint64_t trigger_values;
 596         uint64_t trigger_edge_mask;
 597         uint64_t level_bit, type_bit;
 598         struct dev_context *devc;
 599         struct sr_trigger *trigger;
 600         struct sr_trigger_stage *stage;
 601         struct sr_trigger_match *match;
 602         const GSList *node;
 603         int idx;
 604         enum sr_trigger_matches trg;
 605
 606         devc = sdi->priv;
 607
 608         trigger = sr_session_trigger_get(sdi->session);
 609         if (!trigger || !trigger->stages)
 610                 return SR_OK;
 611
 612         if (trigger->stages->next) {
 613                 sr_err("This device only supports 1 trigger stage.");
 614                 return SR_ERR_ARG;
 615         }
 616         stage = trigger->stages->data;
 617
 618         trigger_mask = 0;
 619         trigger_values = 0;
 620         trigger_edge_mask = 0;
 621
 622         for (node = stage->matches; node; node = node->next) {
 623                 match = node->data;
 624
 625                 if (!match->channel->enabled)
 626                         continue; /* ignore disabled channel */
 627
 628                 idx = match->channel->index;
 629                 trg = match->match;
 630
 631                 if (idx < 0 || idx >= devc->model->num_channels) {
 632                         sr_err("Channel index %d out of range.", idx);
 633                         return SR_ERR_BUG; /* should not happen */
 634                 }
 635                 if (trg != SR_TRIGGER_ZERO
 636                                 && trg != SR_TRIGGER_ONE
 637                                 && trg != SR_TRIGGER_RISING
 638                                 && trg != SR_TRIGGER_FALLING) {
 639                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 640                         return SR_ERR_ARG;
 641                 }
 642                 level_bit = (trg == SR_TRIGGER_ONE
 643                         || trg == SR_TRIGGER_RISING) ? 1 : 0;
 644                 type_bit = (trg == SR_TRIGGER_RISING
 645                         || trg == SR_TRIGGER_FALLING) ? 1 : 0;
 646
 647                 trigger_mask |= UINT64_C(1) << idx;
 648                 trigger_values |= level_bit << idx;
 649                 trigger_edge_mask |= type_bit << idx;
 650         }
 651         devc->trigger_mask = trigger_mask;
 652         devc->trigger_values = trigger_values;
 653         devc->trigger_edge_mask = trigger_edge_mask;
 654
 655         return SR_OK;
 656 }
 657
 658 /* Apply current device configuration to the hardware.
 659  */
 660 static int config_commit(const struct sr_dev_inst *sdi)
 661 {
 662         struct dev_context *devc;
 663         int ret;
 664
 665         devc = sdi->priv;
 666
 667         if (sdi->status != SR_ST_ACTIVE)
 668                 return SR_ERR_DEV_CLOSED;
 669
 670         if (devc->acquisition) {
 671                 sr_err("Acquisition still in progress?");
 672                 return SR_ERR;
 673         }
 674
 675         ret = prepare_trigger_masks(sdi);
 676         if (ret != SR_OK)
 677                 return ret;
 678
 679         ret = (*devc->model->apply_fpga_config)(sdi);
 680         if (ret != SR_OK) {
 681                 sr_err("Failed to apply FPGA configuration.");
 682                 return ret;
 683         }
 684
 685         return SR_OK;
 686 }
 687
 688 /* List available choices for a configuration setting.
 689  */
 690 static int config_list(uint32_t key, GVariant **data,
 691                        const struct sr_dev_inst *sdi,
 692                        const struct sr_channel_group *cg)
 693 {
 694         struct dev_context *devc;
 695         GVariant *gvar;
 696         GVariantBuilder gvb;
 697
 698         (void)cg;
 699
 700         if (key == SR_CONF_SCAN_OPTIONS) {
 701                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 702                                                   scanopts, ARRAY_SIZE(scanopts),
 703                                                   sizeof(scanopts[0]));
 704                 return SR_OK;
 705         }
 706         if (!sdi) {
 707                 if (key != SR_CONF_DEVICE_OPTIONS)
 708                         return SR_ERR_ARG;
 709
 710                 /* List driver capabilities. */
 711                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 712                                                   drvopts, ARRAY_SIZE(drvopts),
 713                                                   sizeof(drvopts[0]));
 714                 return SR_OK;
 715         }
 716
 717         devc = sdi->priv;
 718
 719         /* List the model's device options. */
 720         if (key == SR_CONF_DEVICE_OPTIONS) {
 721                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 722                                                   devc->model->devopts,
 723                                                   devc->model->num_devopts,
 724                                                   sizeof(devc->model->devopts[0]));
 725                 return SR_OK;
 726         }
 727
 728         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 729                 return SR_ERR_NA;
 730
 731         switch (key) {
 732         case SR_CONF_SAMPLERATE:
 733                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_VARDICT);
 734                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 735                                                  devc->model->samplerates,
 736                                                  devc->model->num_samplerates,
 737                                                  sizeof(devc->model->samplerates[0]));
 738                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 739                 *data = g_variant_builder_end(&gvb);
 740                 break;
 741         case SR_CONF_TRIGGER_MATCH:
 742                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 743                                                   trigger_matches,
 744                                                   ARRAY_SIZE(trigger_matches),
 745                                                   sizeof(trigger_matches[0]));
 746                 break;
 747         case SR_CONF_TRIGGER_SOURCE:
 748                 *data = g_variant_new_strv(trigger_source_names,
 749                                            ARRAY_SIZE(trigger_source_names));
 750                 break;
 751         case SR_CONF_TRIGGER_SLOPE:
 752         case SR_CONF_CLOCK_EDGE:
 753                 *data = g_variant_new_strv(signal_edge_names,
 754                                            ARRAY_SIZE(signal_edge_names));
 755                 break;
 756         default:
 757                 /* Must not happen for a key listed in devopts. */
 758                 return SR_ERR_BUG;
 759         }
 760
 761         return SR_OK;
 762 }
 763
 764 /* Set up the device hardware to begin capturing samples as soon as the
 765  * configured trigger conditions are met, or immediately if no triggers
 766  * are configured.
 767  */
 768 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 769 {
 770         (void)cb_data;
 771
 772         if (sdi->status != SR_ST_ACTIVE)
 773                 return SR_ERR_DEV_CLOSED;
 774
 775         sr_info("Starting acquisition.");
 776
 777         return lwla_start_acquisition(sdi);
 778 }
 779
 780 /* Request that a running capture operation be stopped.
 781  */
 782 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 783 {
 784         struct dev_context *devc;
 785
 786         (void)cb_data;
 787         devc = sdi->priv;
 788
 789         if (sdi->status != SR_ST_ACTIVE)
 790                 return SR_ERR_DEV_CLOSED;
 791
 792         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 793                 devc->cancel_requested = TRUE;
 794                 sr_dbg("Stopping acquisition.");
 795         }
 796         return SR_OK;
 797 }
 798
 799 /* SysClk LWLA driver descriptor.
 800  */
 801 SR_PRIV struct sr_dev_driver sysclk_lwla_driver_info = {
 802         .name = "sysclk-lwla",
 803         .longname = "SysClk LWLA series",
 804         .api_version = 1,
 805         .init = init,
 806         .cleanup = dev_clear,
 807         .scan = scan,
 808         .dev_list = dev_list,
 809         .dev_clear = dev_clear,
 810         .config_get = config_get,
 811         .config_set = config_set,
 812         .config_channel_set = config_channel_set,
 813         .config_commit = config_commit,
 814         .config_list = config_list,
 815         .dev_open = dev_open,
 816         .dev_close = dev_close,
 817         .dev_acquisition_start = dev_acquisition_start,
 818         .dev_acquisition_stop = dev_acquisition_stop,
 819         .context = NULL,
 820 };