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