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 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t drvopts[] = {
  34         SR_CONF_LOGIC_ANALYZER,
  35 };
  36
  37 static const int32_t trigger_matches[] = {
  38         SR_TRIGGER_ZERO,
  39         SR_TRIGGER_ONE,
  40         SR_TRIGGER_RISING,
  41         SR_TRIGGER_FALLING,
  42 };
  43
  44 static const char *const trigger_source_names[] = {
  45         [TRIGGER_CHANNELS] = "CH",
  46         [TRIGGER_EXT_TRG] = "TRG",
  47 };
  48
  49 static const char *const signal_edge_names[] = {
  50         [EDGE_POSITIVE] = "r",
  51         [EDGE_NEGATIVE] = "f",
  52 };
  53
  54 static struct sr_dev_inst *dev_inst_new(const struct model_info *model)
  55 {
  56         struct sr_dev_inst *sdi;
  57         struct dev_context *devc;
  58         int i;
  59         char name[8];
  60
  61         devc = g_malloc0(sizeof(struct dev_context));
  62         devc->model = model;
  63         devc->active_fpga_config = FPGA_NOCONF;
  64         devc->cfg_rle = TRUE;
  65         devc->samplerate = model->samplerates[0];
  66         devc->channel_mask = (UINT64_C(1) << model->num_channels) - 1;
  67
  68         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  69         sdi->status = SR_ST_INACTIVE;
  70         sdi->vendor = g_strdup(VENDOR_NAME);
  71         sdi->model = g_strdup(model->name);
  72         sdi->priv = devc;
  73
  74         for (i = 0; i < model->num_channels; i++) {
  75                 g_snprintf(name, sizeof(name), "CH%d", i + 1);
  76                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, name);
  77         }
  78
  79         return sdi;
  80 }
  81
  82 /* Create a new device instance for a libusb device if it is a SysClk LWLA
  83  * device and also matches the connection specification.
  84  */
  85 static struct sr_dev_inst *dev_inst_new_matching(GSList *conn_matches,
  86                                                  libusb_device *dev)
  87 {
  88         GSList *node;
  89         struct sr_usb_dev_inst *usb;
  90         const struct model_info *model;
  91         struct sr_dev_inst *sdi;
  92         struct libusb_device_descriptor des;
  93         int bus, address, ret;
  94         unsigned int vid, pid;
  95
  96         bus = libusb_get_bus_number(dev);
  97         address = libusb_get_device_address(dev);
  98
  99         for (node = conn_matches; node != NULL; node = node->next) {
 100                 usb = node->data;
 101                 if (usb && usb->bus == bus && usb->address == address)
 102                         break; /* found */
 103         }
 104         if (conn_matches && !node)
 105                 return NULL; /* no match */
 106
 107         ret = libusb_get_device_descriptor(dev, &des);
 108         if (ret != 0) {
 109                 sr_err("Failed to get USB device descriptor: %s.",
 110                         libusb_error_name(ret));
 111                 return NULL;
 112         }
 113         vid = des.idVendor;
 114         pid = des.idProduct;
 115
 116         /* Create sigrok device instance. */
 117         if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1016) {
 118                 model = &lwla1016_info;
 119         } else if (vid == USB_VID_SYSCLK && pid == USB_PID_LWLA1034) {
 120                 model = &lwla1034_info;
 121         } else {
 122                 if (conn_matches)
 123                         sr_warn("USB device %d.%d (%04x:%04x) is not a"
 124                                 " SysClk LWLA.", bus, address, vid, pid);
 125                 return NULL;
 126         }
 127         sdi = dev_inst_new(model);
 128
 129         sdi->inst_type = SR_INST_USB;
 130         sdi->conn = sr_usb_dev_inst_new(bus, address, NULL);
 131
 132         return sdi;
 133 }
 134
 135 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 136 {
 137         GSList *conn_devices, *devices, *node;
 138         struct drv_context *drvc;
 139         struct sr_dev_inst *sdi;
 140         struct sr_config *src;
 141         const char *conn;
 142         libusb_device **devlist;
 143         ssize_t num_devs, i;
 144
 145         drvc = di->context;
 146         conn = NULL;
 147         conn_devices = NULL;
 148         devices = NULL;
 149
 150         for (node = options; node != NULL; node = node->next) {
 151                 src = node->data;
 152                 if (src->key == SR_CONF_CONN) {
 153                         conn = g_variant_get_string(src->data, NULL);
 154                         break;
 155                 }
 156         }
 157         if (conn) {
 158                 /* Find devices matching the connection specification. */
 159                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 160         }
 161
 162         /* List all libusb devices. */
 163         num_devs = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 164         if (num_devs < 0) {
 165                 sr_err("Failed to list USB devices: %s.",
 166                         libusb_error_name(num_devs));
 167                 g_slist_free_full(conn_devices,
 168                         (GDestroyNotify)&sr_usb_dev_inst_free);
 169                 return NULL;
 170         }
 171
 172         /* Scan the USB device list for matching LWLA devices. */
 173         for (i = 0; i < num_devs; i++) {
 174                 sdi = dev_inst_new_matching(conn_devices, devlist[i]);
 175                 if (!sdi)
 176                         continue; /* no match */
 177
 178                 /* Register device instance with driver. */
 179                 devices = g_slist_append(devices, sdi);
 180         }
 181
 182         libusb_free_device_list(devlist, 1);
 183         g_slist_free_full(conn_devices, (GDestroyNotify)&sr_usb_dev_inst_free);
 184
 185         return std_scan_complete(di, devices);
 186 }
 187
 188 /* Drain any pending data from the USB transfer buffers on the device.
 189  * This may be necessary e.g. after a crash or generally to clean up after
 190  * an abnormal condition.
 191  */
 192 static int drain_usb(struct sr_usb_dev_inst *usb, unsigned int endpoint)
 193 {
 194         int drained, xfer_len, ret;
 195         unsigned char buf[512];
 196         const unsigned int drain_timeout_ms = 10;
 197
 198         drained = 0;
 199         do {
 200                 xfer_len = 0;
 201                 ret = libusb_bulk_transfer(usb->devhdl, endpoint,
 202                                            buf, sizeof(buf), &xfer_len,
 203                                            drain_timeout_ms);
 204                 drained += xfer_len;
 205         } while (ret == LIBUSB_SUCCESS && xfer_len != 0);
 206
 207         if (ret != LIBUSB_SUCCESS && ret != LIBUSB_ERROR_TIMEOUT) {
 208                 sr_err("Failed to drain USB endpoint %u: %s.",
 209                        endpoint & (LIBUSB_ENDPOINT_IN - 1),
 210                        libusb_error_name(ret));
 211                 return SR_ERR;
 212         }
 213         if (drained > 0) {
 214                 sr_warn("Drained %d bytes from USB endpoint %u.",
 215                         drained, endpoint & (LIBUSB_ENDPOINT_IN - 1));
 216         }
 217
 218         return SR_OK;
 219 }
 220
 221 static int dev_open(struct sr_dev_inst *sdi)
 222 {
 223         struct drv_context *drvc;
 224         struct dev_context *devc;
 225         struct sr_usb_dev_inst *usb;
 226         int i, ret;
 227
 228         drvc = sdi->driver->context;
 229         devc = sdi->priv;
 230         usb = sdi->conn;
 231
 232         /* Try the whole shebang three times, fingers crossed. */
 233         for (i = 0; i < 3; i++) {
 234                 ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 235                 if (ret != SR_OK)
 236                         return ret;
 237
 238                 ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
 239                 if (ret != LIBUSB_SUCCESS) {
 240                         sr_err("Failed to set USB configuration: %s.",
 241                                 libusb_error_name(ret));
 242                         sr_usb_close(usb);
 243                         return SR_ERR;
 244                 }
 245
 246                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 247                 if (ret != LIBUSB_SUCCESS) {
 248                         sr_err("Failed to claim interface: %s.",
 249                                 libusb_error_name(ret));
 250                         sr_usb_close(usb);
 251                         return SR_ERR;
 252                 }
 253
 254                 ret = drain_usb(usb, EP_REPLY);
 255                 if (ret != SR_OK) {
 256                         sr_usb_close(usb);
 257                         return ret;
 258                 }
 259                 /* This delay appears to be necessary for reliable operation. */
 260                 g_usleep(30 * 1000);
 261
 262                 devc->active_fpga_config = FPGA_NOCONF;
 263                 devc->short_transfer_quirk = FALSE;
 264                 devc->state = STATE_IDLE;
 265
 266                 ret = (*devc->model->apply_fpga_config)(sdi);
 267
 268                 if (ret == SR_OK)
 269                         ret = (*devc->model->device_init_check)(sdi);
 270                 if (ret == SR_OK)
 271                         break;
 272
 273                 /* Rinse and repeat. */
 274                 sr_usb_close(usb);
 275         }
 276
 277         if (ret == SR_OK && devc->short_transfer_quirk)
 278                 sr_warn("Short transfer quirk detected! "
 279                         "Memory reads will be slow.");
 280         return ret;
 281 }
 282
 283 static int dev_close(struct sr_dev_inst *sdi)
 284 {
 285         struct dev_context *devc;
 286         struct sr_usb_dev_inst *usb;
 287         int ret;
 288
 289         devc = sdi->priv;
 290         usb = sdi->conn;
 291
 292         if (devc->acquisition) {
 293                 sr_err("Cannot close device during acquisition!");
 294                 /* Request stop, leak handle, and prepare for the worst. */
 295                 devc->cancel_requested = TRUE;
 296                 return SR_ERR_BUG;
 297         }
 298
 299         /* Download of the shutdown bitstream, if any. */
 300         ret = (*devc->model->apply_fpga_config)(sdi);
 301         if (ret != SR_OK)
 302                 sr_warn("Unable to shut down device.");
 303
 304         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 305
 306         sr_usb_close(usb);
 307
 308         return SR_OK;
 309 }
 310
 311 /* Check whether the device options contain a specific key.
 312  * Also match against get/set/list bits if specified.
 313  */
 314 static int has_devopt(const struct model_info *model, uint32_t key)
 315 {
 316         unsigned int i;
 317
 318         for (i = 0; i < model->num_devopts; i++) {
 319                 if ((model->devopts[i] & (SR_CONF_MASK | key)) == key)
 320                         return TRUE;
 321         }
 322
 323         return FALSE;
 324 }
 325
 326 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 327                       const struct sr_channel_group *cg)
 328 {
 329         struct dev_context *devc;
 330         unsigned int idx;
 331
 332         (void)cg;
 333
 334         if (!sdi)
 335                 return SR_ERR_ARG;
 336
 337         devc = sdi->priv;
 338
 339         if (!has_devopt(devc->model, key | SR_CONF_GET))
 340                 return SR_ERR_NA;
 341
 342         switch (key) {
 343         case SR_CONF_SAMPLERATE:
 344                 *data = g_variant_new_uint64(devc->samplerate);
 345                 break;
 346         case SR_CONF_LIMIT_MSEC:
 347                 *data = g_variant_new_uint64(devc->limit_msec);
 348                 break;
 349         case SR_CONF_LIMIT_SAMPLES:
 350                 *data = g_variant_new_uint64(devc->limit_samples);
 351                 break;
 352         case SR_CONF_RLE:
 353                 *data = g_variant_new_boolean(devc->cfg_rle);
 354                 break;
 355         case SR_CONF_EXTERNAL_CLOCK:
 356                 *data = g_variant_new_boolean(devc->cfg_clock_source
 357                                                 == CLOCK_EXT_CLK);
 358                 break;
 359         case SR_CONF_CLOCK_EDGE:
 360                 idx = devc->cfg_clock_edge;
 361                 if (idx >= ARRAY_SIZE(signal_edge_names))
 362                         return SR_ERR_BUG;
 363                 *data = g_variant_new_string(signal_edge_names[idx]);
 364                 break;
 365         case SR_CONF_TRIGGER_SOURCE:
 366                 idx = devc->cfg_trigger_source;
 367                 if (idx >= ARRAY_SIZE(trigger_source_names))
 368                         return SR_ERR_BUG;
 369                 *data = g_variant_new_string(trigger_source_names[idx]);
 370                 break;
 371         case SR_CONF_TRIGGER_SLOPE:
 372                 idx = devc->cfg_trigger_slope;
 373                 if (idx >= ARRAY_SIZE(signal_edge_names))
 374                         return SR_ERR_BUG;
 375                 *data = g_variant_new_string(signal_edge_names[idx]);
 376                 break;
 377         default:
 378                 /* Must not happen for a key listed in devopts. */
 379                 return SR_ERR_BUG;
 380         }
 381
 382         return SR_OK;
 383 }
 384
 385 /* Helper for mapping a string-typed configuration value to an index
 386  * within a table of possible values.
 387  */
 388 static int lookup_index(GVariant *value, const char *const *table, int len)
 389 {
 390         const char *entry;
 391         int i;
 392
 393         entry = g_variant_get_string(value, NULL);
 394         if (!entry)
 395                 return -1;
 396
 397         /* Linear search is fine for very small tables. */
 398         for (i = 0; i < len; i++) {
 399                 if (strcmp(entry, table[i]) == 0)
 400                         return i;
 401         }
 402
 403         return -1;
 404 }
 405
 406 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 407                       const struct sr_channel_group *cg)
 408 {
 409         uint64_t value;
 410         struct dev_context *devc;
 411         int idx;
 412
 413         (void)cg;
 414
 415         if (!sdi)
 416                 return SR_ERR_ARG;
 417
 418         devc = sdi->priv;
 419
 420         if (!has_devopt(devc->model, key | SR_CONF_SET))
 421                 return SR_ERR_NA;
 422
 423         switch (key) {
 424         case SR_CONF_SAMPLERATE:
 425                 value = g_variant_get_uint64(data);
 426                 if (value < devc->model->samplerates[devc->model->num_samplerates - 1]
 427                                 || value > devc->model->samplerates[0])
 428                         return SR_ERR_SAMPLERATE;
 429                 devc->samplerate = value;
 430                 break;
 431         case SR_CONF_LIMIT_MSEC:
 432                 value = g_variant_get_uint64(data);
 433                 if (value > MAX_LIMIT_MSEC)
 434                         return SR_ERR_ARG;
 435                 devc->limit_msec = value;
 436                 break;
 437         case SR_CONF_LIMIT_SAMPLES:
 438                 value = g_variant_get_uint64(data);
 439                 if (value > MAX_LIMIT_SAMPLES)
 440                         return SR_ERR_ARG;
 441                 devc->limit_samples = value;
 442                 break;
 443         case SR_CONF_RLE:
 444                 devc->cfg_rle = g_variant_get_boolean(data);
 445                 break;
 446         case SR_CONF_EXTERNAL_CLOCK:
 447                 devc->cfg_clock_source = (g_variant_get_boolean(data))
 448                         ? CLOCK_EXT_CLK : CLOCK_INTERNAL;
 449                 break;
 450         case SR_CONF_CLOCK_EDGE:
 451                 idx = lookup_index(data, signal_edge_names,
 452                                    ARRAY_SIZE(signal_edge_names));
 453                 if (idx < 0)
 454                         return SR_ERR_ARG;
 455                 devc->cfg_clock_edge = idx;
 456                 break;
 457         case SR_CONF_TRIGGER_SOURCE:
 458                 idx = lookup_index(data, trigger_source_names,
 459                                    ARRAY_SIZE(trigger_source_names));
 460                 if (idx < 0)
 461                         return SR_ERR_ARG;
 462                 devc->cfg_trigger_source = idx;
 463                 break;
 464         case SR_CONF_TRIGGER_SLOPE:
 465                 idx = lookup_index(data, signal_edge_names,
 466                                    ARRAY_SIZE(signal_edge_names));
 467                 if (idx < 0)
 468                         return SR_ERR_ARG;
 469                 devc->cfg_trigger_slope = idx;
 470                 break;
 471         default:
 472                 /* Must not happen for a key listed in devopts. */
 473                 return SR_ERR_BUG;
 474         }
 475
 476         return SR_OK;
 477 }
 478
 479 static int config_channel_set(const struct sr_dev_inst *sdi,
 480                               struct sr_channel *ch, unsigned int changes)
 481 {
 482         uint64_t channel_bit;
 483         struct dev_context *devc;
 484
 485         if (!sdi)
 486                 return SR_ERR_ARG;
 487
 488         devc = sdi->priv;
 489
 490         if (ch->index < 0 || ch->index >= devc->model->num_channels) {
 491                 sr_err("Channel index %d out of range.", ch->index);
 492                 return SR_ERR_BUG;
 493         }
 494
 495         if ((changes & SR_CHANNEL_SET_ENABLED) != 0) {
 496                 channel_bit = UINT64_C(1) << ch->index;
 497
 498                 /* Enable or disable logic input for this channel. */
 499                 if (ch->enabled)
 500                         devc->channel_mask |= channel_bit;
 501                 else
 502                         devc->channel_mask &= ~channel_bit;
 503         }
 504
 505         return SR_OK;
 506 }
 507
 508 /* Derive trigger masks from the session's trigger configuration. */
 509 static int prepare_trigger_masks(const struct sr_dev_inst *sdi)
 510 {
 511         uint64_t trigger_mask, trigger_values, trigger_edge_mask;
 512         uint64_t level_bit, type_bit;
 513         struct dev_context *devc;
 514         struct sr_trigger *trigger;
 515         struct sr_trigger_stage *stage;
 516         struct sr_trigger_match *match;
 517         const GSList *node;
 518         int idx;
 519         enum sr_trigger_matches trg;
 520
 521         devc = sdi->priv;
 522
 523         trigger = sr_session_trigger_get(sdi->session);
 524         if (!trigger || !trigger->stages)
 525                 return SR_OK;
 526
 527         if (trigger->stages->next) {
 528                 sr_err("This device only supports 1 trigger stage.");
 529                 return SR_ERR_ARG;
 530         }
 531         stage = trigger->stages->data;
 532
 533         trigger_mask = 0;
 534         trigger_values = 0;
 535         trigger_edge_mask = 0;
 536
 537         for (node = stage->matches; node; node = node->next) {
 538                 match = node->data;
 539
 540                 if (!match->channel->enabled)
 541                         continue; /* Ignore disabled channel. */
 542
 543                 idx = match->channel->index;
 544                 trg = match->match;
 545
 546                 if (idx < 0 || idx >= devc->model->num_channels) {
 547                         sr_err("Channel index %d out of range.", idx);
 548                         return SR_ERR_BUG; /* Should not happen. */
 549                 }
 550                 if (trg != SR_TRIGGER_ZERO
 551                                 && trg != SR_TRIGGER_ONE
 552                                 && trg != SR_TRIGGER_RISING
 553                                 && trg != SR_TRIGGER_FALLING) {
 554                         sr_err("Unsupported trigger match for CH%d.", idx + 1);
 555                         return SR_ERR_ARG;
 556                 }
 557                 level_bit = (trg == SR_TRIGGER_ONE
 558                         || trg == SR_TRIGGER_RISING) ? 1 : 0;
 559                 type_bit = (trg == SR_TRIGGER_RISING
 560                         || trg == SR_TRIGGER_FALLING) ? 1 : 0;
 561
 562                 trigger_mask |= UINT64_C(1) << idx;
 563                 trigger_values |= level_bit << idx;
 564                 trigger_edge_mask |= type_bit << idx;
 565         }
 566         devc->trigger_mask = trigger_mask;
 567         devc->trigger_values = trigger_values;
 568         devc->trigger_edge_mask = trigger_edge_mask;
 569
 570         return SR_OK;
 571 }
 572
 573 static int config_commit(const struct sr_dev_inst *sdi)
 574 {
 575         struct dev_context *devc;
 576         int ret;
 577
 578         devc = sdi->priv;
 579
 580         if (devc->acquisition) {
 581                 sr_err("Acquisition still in progress?");
 582                 return SR_ERR;
 583         }
 584
 585         ret = prepare_trigger_masks(sdi);
 586         if (ret != SR_OK)
 587                 return ret;
 588
 589         ret = (*devc->model->apply_fpga_config)(sdi);
 590         if (ret != SR_OK) {
 591                 sr_err("Failed to apply FPGA configuration.");
 592                 return ret;
 593         }
 594
 595         return SR_OK;
 596 }
 597
 598 static int config_list(uint32_t key, GVariant **data,
 599                        const struct sr_dev_inst *sdi,
 600                        const struct sr_channel_group *cg)
 601 {
 602         struct dev_context *devc;
 603         GVariant *gvar;
 604         GVariantBuilder gvb;
 605
 606         devc = (sdi) ? sdi->priv : NULL;
 607
 608         switch (key) {
 609         case SR_CONF_SCAN_OPTIONS:
 610         case SR_CONF_DEVICE_OPTIONS:
 611                 return std_opts_config_list(key, data, sdi, cg,
 612                         scanopts, ARRAY_SIZE(scanopts),
 613                         drvopts, ARRAY_SIZE(drvopts),
 614                         (devc) ? devc->model->devopts : NULL,
 615                         (devc) ? devc->model->num_devopts : 0);
 616         }
 617
 618         if (!has_devopt(devc->model, key | SR_CONF_LIST))
 619                 return SR_ERR_NA;
 620
 621         switch (key) {
 622         case SR_CONF_SAMPLERATE:
 623                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_VARDICT);
 624                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 625                         devc->model->samplerates, devc->model->num_samplerates,
 626                         sizeof(devc->model->samplerates[0]));
 627                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 628                 *data = g_variant_builder_end(&gvb);
 629                 break;
 630         case SR_CONF_TRIGGER_MATCH:
 631                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 632                         trigger_matches, ARRAY_SIZE(trigger_matches),
 633                         sizeof(trigger_matches[0]));
 634                 break;
 635         case SR_CONF_TRIGGER_SOURCE:
 636                 *data = g_variant_new_strv(trigger_source_names,
 637                         ARRAY_SIZE(trigger_source_names));
 638                 break;
 639         case SR_CONF_TRIGGER_SLOPE:
 640         case SR_CONF_CLOCK_EDGE:
 641                 *data = g_variant_new_strv(signal_edge_names,
 642                         ARRAY_SIZE(signal_edge_names));
 643                 break;
 644         default:
 645                 /* Must not happen for a key listed in devopts. */
 646                 return SR_ERR_BUG;
 647         }
 648
 649         return SR_OK;
 650 }
 651
 652 /* Set up the device hardware to begin capturing samples as soon as the
 653  * configured trigger conditions are met, or immediately if no triggers
 654  * are configured.
 655  */
 656 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 657 {
 658         return lwla_start_acquisition(sdi);
 659 }
 660
 661 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 662 {
 663         struct dev_context *devc;
 664
 665         devc = sdi->priv;
 666
 667         if (devc->state != STATE_IDLE && !devc->cancel_requested) {
 668                 devc->cancel_requested = TRUE;
 669                 sr_dbg("Requesting cancel.");
 670         }
 671
 672         return SR_OK;
 673 }
 674
 675 static struct sr_dev_driver sysclk_lwla_driver_info = {
 676         .name = "sysclk-lwla",
 677         .longname = "SysClk LWLA series",
 678         .api_version = 1,
 679         .init = std_init,
 680         .cleanup = std_cleanup,
 681         .scan = scan,
 682         .dev_list = std_dev_list,
 683         .dev_clear = std_dev_clear,
 684         .config_get = config_get,
 685         .config_set = config_set,
 686         .config_channel_set = config_channel_set,
 687         .config_commit = config_commit,
 688         .config_list = config_list,
 689         .dev_open = dev_open,
 690         .dev_close = dev_close,
 691         .dev_acquisition_start = dev_acquisition_start,
 692         .dev_acquisition_stop = dev_acquisition_stop,
 693         .context = NULL,
 694 };
 695 SR_REGISTER_DEV_DRIVER(sysclk_lwla_driver_info);