hardware/saleae-logic16/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   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 <glib.h>
  21 #include <libusb.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include "libsigrok.h"
  25 #include "libsigrok-internal.h"
  26 #include "protocol.h"
  27
  28 #define LOGIC16_VID 0x21a9
  29 #define LOGIC16_PID 0x1001
  30 #define NUM_PROBES  16
  31
  32 #define USB_INTERFACE           0
  33 #define USB_CONFIGURATION       1
  34 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  35
  36 #define MAX_RENUM_DELAY_MS      3000
  37 #define NUM_SIMUL_TRANSFERS     32
  38
  39
  40 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  41 static struct sr_dev_driver *di = &saleae_logic16_driver_info;
  42
  43 static const char *probe_names[NUM_PROBES + 1] = {
  44         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  45         "9", "10", "11", "12", "13", "14", "15",
  46         NULL,
  47 };
  48
  49 static const uint64_t samplerates[] = {
  50         SR_KHZ(500),
  51         SR_MHZ(1),
  52         SR_MHZ(2),
  53         SR_MHZ(4),
  54         SR_MHZ(5),
  55         SR_MHZ(8),
  56         SR_MHZ(10),
  57         SR_KHZ(12500),
  58         SR_MHZ(16),
  59         SR_MHZ(25),
  60         SR_MHZ(32),
  61         SR_MHZ(40),
  62         SR_MHZ(80),
  63         SR_MHZ(100),
  64 };
  65
  66 static int init(struct sr_context *sr_ctx)
  67 {
  68         return std_init(sr_ctx, di, LOG_PREFIX);
  69 }
  70
  71 static gboolean check_conf_profile(libusb_device *dev)
  72 {
  73         struct libusb_device_descriptor des;
  74         struct libusb_device_handle *hdl;
  75         gboolean ret;
  76         unsigned char strdesc[64];
  77
  78         hdl = NULL;
  79         ret = FALSE;
  80         while (!ret) {
  81                 /* Assume the FW has not been loaded, unless proven wrong. */
  82                 if (libusb_get_device_descriptor(dev, &des) != 0)
  83                         break;
  84
  85                 if (libusb_open(dev, &hdl) != 0)
  86                         break;
  87
  88                 if (libusb_get_string_descriptor_ascii(hdl,
  89                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
  90                         break;
  91                 if (strcmp((const char *)strdesc, "Saleae LLC"))
  92                         break;
  93
  94                 if (libusb_get_string_descriptor_ascii(hdl,
  95                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
  96                         break;
  97                 if (strcmp((const char *)strdesc, "Logic S/16"))
  98                         break;
  99
 100                 /* If we made it here, it must be a configured Logic16. */
 101                 ret = TRUE;
 102         }
 103         if (hdl)
 104                 libusb_close(hdl);
 105
 106         return ret;
 107 }
 108
 109 static GSList *scan(GSList *options)
 110 {
 111         struct drv_context *drvc;
 112         struct dev_context *devc;
 113         struct sr_dev_inst *sdi;
 114         struct sr_usb_dev_inst *usb;
 115         struct sr_probe *probe;
 116         struct sr_config *src;
 117         GSList *l, *devices, *conn_devices;
 118         struct libusb_device_descriptor des;
 119         libusb_device **devlist;
 120         int devcnt, ret, i, j;
 121         const char *conn;
 122
 123         drvc = di->priv;
 124
 125         conn = NULL;
 126         for (l = options; l; l = l->next) {
 127                 src = l->data;
 128                 switch (src->key) {
 129                 case SR_CONF_CONN:
 130                         conn = g_variant_get_string(src->data, NULL);
 131                         break;
 132                 }
 133         }
 134         if (conn)
 135                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 136         else
 137                 conn_devices = NULL;
 138
 139         /* Find all Logic16 devices and upload firmware to them. */
 140         devices = NULL;
 141         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 142         for (i = 0; devlist[i]; i++) {
 143                 if (conn) {
 144                         usb = NULL;
 145                         for (l = conn_devices; l; l = l->next) {
 146                                 usb = l->data;
 147                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 148                                     && usb->address == libusb_get_device_address(devlist[i]))
 149                                         break;
 150                         }
 151                         if (!l)
 152                                 /* This device matched none of the ones that
 153                                  * matched the conn specification. */
 154                                 continue;
 155                 }
 156
 157                 if ((ret = libusb_get_device_descriptor( devlist[i], &des)) != 0) {
 158                         sr_warn("Failed to get device descriptor: %s.",
 159                                 libusb_error_name(ret));
 160                         continue;
 161                 }
 162
 163                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 164                         continue;
 165
 166                 devcnt = g_slist_length(drvc->instances);
 167                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 168                                       "Saleae", "Logic16", NULL);
 169                 if (!sdi)
 170                         return NULL;
 171                 sdi->driver = di;
 172
 173                 for (j = 0; probe_names[j]; j++) {
 174                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 175                                                    probe_names[j])))
 176                                 return NULL;
 177                         sdi->probes = g_slist_append(sdi->probes, probe);
 178                 }
 179
 180                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 181                         return NULL;
 182                 sdi->priv = devc;
 183                 drvc->instances = g_slist_append(drvc->instances, sdi);
 184                 devices = g_slist_append(devices, sdi);
 185
 186                 if (check_conf_profile(devlist[i])) {
 187                         /* Already has the firmware, so fix the new address. */
 188                         sr_dbg("Found a Logic16 device.");
 189                         sdi->status = SR_ST_INACTIVE;
 190                         sdi->inst_type = SR_INST_USB;
 191                         sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
 192                                                         libusb_get_device_address(devlist[i]), NULL);
 193                 } else {
 194                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 195                                                   FX2_FIRMWARE) == SR_OK)
 196                                 /* Store when this device's FW was updated. */
 197                                 devc->fw_updated = g_get_monotonic_time();
 198                         else
 199                                 sr_err("Firmware upload failed for "
 200                                        "device %d.", devcnt);
 201                         sdi->inst_type = SR_INST_USB;
 202                         sdi->conn = sr_usb_dev_inst_new (libusb_get_bus_number(devlist[i]),
 203                                                          0xff, NULL);
 204                 }
 205         }
 206         libusb_free_device_list(devlist, 1);
 207         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 208
 209         return devices;
 210 }
 211
 212 static GSList *dev_list(void)
 213 {
 214         struct drv_context *drvc;
 215
 216         drvc = di->priv;
 217
 218         return drvc->instances;
 219 }
 220
 221 static int dev_clear(void)
 222 {
 223         return std_dev_clear(di, NULL);
 224 }
 225
 226 static int logic16_dev_open(struct sr_dev_inst *sdi)
 227 {
 228         libusb_device **devlist;
 229         struct sr_usb_dev_inst *usb;
 230         struct libusb_device_descriptor des;
 231         struct dev_context *devc;
 232         struct drv_context *drvc;
 233         int ret, skip, i, device_count;
 234
 235         drvc = di->priv;
 236         devc = sdi->priv;
 237         usb = sdi->conn;
 238
 239         if (sdi->status == SR_ST_ACTIVE)
 240                 /* Device is already in use. */
 241                 return SR_ERR;
 242
 243         skip = 0;
 244         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 245         if (device_count < 0) {
 246                 sr_err("Failed to get device list: %s.",
 247                        libusb_error_name(device_count));
 248                 return SR_ERR;
 249         }
 250
 251         for (i = 0; i < device_count; i++) {
 252                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 253                         sr_err("Failed to get device descriptor: %s.",
 254                                libusb_error_name(ret));
 255                         continue;
 256                 }
 257
 258                 if (des.idVendor != LOGIC16_VID
 259                     || des.idProduct != LOGIC16_PID)
 260                         continue;
 261
 262                 if (sdi->status == SR_ST_INITIALIZING) {
 263                         if (skip != sdi->index) {
 264                                 /* Skip devices of this type that aren't the one we want. */
 265                                 skip += 1;
 266                                 continue;
 267                         }
 268                 } else if (sdi->status == SR_ST_INACTIVE) {
 269                         /*
 270                          * This device is fully enumerated, so we need to find
 271                          * this device by vendor, product, bus and address.
 272                          */
 273                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 274                                 || libusb_get_device_address(devlist[i]) != usb->address)
 275                                 /* This is not the one. */
 276                                 continue;
 277                 }
 278
 279                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 280                         if (usb->address == 0xff)
 281                                 /*
 282                                  * First time we touch this device after FW
 283                                  * upload, so we don't know the address yet.
 284                                  */
 285                                 usb->address = libusb_get_device_address(devlist[i]);
 286                 } else {
 287                         sr_err("Failed to open device: %s.",
 288                                libusb_error_name(ret));
 289                         break;
 290                 }
 291
 292                 if ((ret = saleae_logic16_init_device(sdi)) != SR_OK) {
 293                         sr_err("Failed to init device.");
 294                         break;
 295                 }
 296
 297                 sdi->status = SR_ST_ACTIVE;
 298                 sr_info("Opened device %d on %d.%d, "
 299                         "interface %d.",
 300                         sdi->index, usb->bus, usb->address,
 301                         USB_INTERFACE);
 302
 303                 break;
 304         }
 305         libusb_free_device_list(devlist, 1);
 306
 307         if (sdi->status != SR_ST_ACTIVE)
 308                 return SR_ERR;
 309
 310         return SR_OK;
 311 }
 312
 313 static int dev_open(struct sr_dev_inst *sdi)
 314 {
 315         struct sr_usb_dev_inst *usb;
 316         struct dev_context *devc;
 317         int ret;
 318         int64_t timediff_us, timediff_ms;
 319
 320         devc = sdi->priv;
 321         usb = sdi->conn;
 322
 323         /*
 324          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 325          * milliseconds for the FX2 to renumerate.
 326          */
 327         ret = SR_ERR;
 328         if (devc->fw_updated > 0) {
 329                 sr_info("Waiting for device to reset.");
 330                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 331                 g_usleep(300 * 1000);
 332                 timediff_ms = 0;
 333                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 334                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 335                                 break;
 336                         g_usleep(100 * 1000);
 337
 338                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 339                         timediff_ms = timediff_us / 1000;
 340                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 341                 }
 342                 if (ret != SR_OK) {
 343                         sr_err("Device failed to renumerate.");
 344                         return SR_ERR;
 345                 }
 346                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 347         } else {
 348                 sr_info("Firmware upload was not needed.");
 349                 ret = logic16_dev_open(sdi);
 350         }
 351
 352         if (ret != SR_OK) {
 353                 sr_err("Unable to open device.");
 354                 return SR_ERR;
 355         }
 356
 357         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 358         if (ret != 0) {
 359                 switch(ret) {
 360                 case LIBUSB_ERROR_BUSY:
 361                         sr_err("Unable to claim USB interface. Another "
 362                                "program or driver has already claimed it.");
 363                         break;
 364                 case LIBUSB_ERROR_NO_DEVICE:
 365                         sr_err("Device has been disconnected.");
 366                         break;
 367                 default:
 368                         sr_err("Unable to claim interface: %s.",
 369                                libusb_error_name(ret));
 370                         break;
 371                 }
 372
 373                 return SR_ERR;
 374         }
 375
 376         if (devc->cur_samplerate == 0) {
 377                 /* Samplerate hasn't been set; default to the slowest one. */
 378                 devc->cur_samplerate = samplerates[0];
 379         }
 380
 381         return SR_OK;
 382 }
 383
 384 static int dev_close(struct sr_dev_inst *sdi)
 385 {
 386         struct sr_usb_dev_inst *usb;
 387
 388         usb = sdi->conn;
 389         if (usb->devhdl == NULL)
 390                 return SR_ERR;
 391
 392         sr_info("Closing device %d on %d.%d interface %d.",
 393                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 394         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 395         libusb_close(usb->devhdl);
 396         usb->devhdl = NULL;
 397         sdi->status = SR_ST_INACTIVE;
 398
 399         return SR_OK;
 400 }
 401
 402 static int cleanup(void)
 403 {
 404         int ret;
 405         struct drv_context *drvc;
 406
 407         if (!(drvc = di->priv))
 408                 /* Can get called on an unused driver, doesn't matter. */
 409                 return SR_OK;
 410
 411         ret = dev_clear();
 412         g_free(drvc);
 413         di->priv = NULL;
 414
 415         return ret;
 416 }
 417
 418 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 419 {
 420         struct dev_context *devc;
 421         int ret;
 422
 423         (void)sdi;
 424         (void)data;
 425
 426         ret = SR_OK;
 427         switch (key) {
 428         case SR_CONF_SAMPLERATE:
 429                 if (!sdi)
 430                         return SR_ERR;
 431                 devc = sdi->priv;
 432                 *data = g_variant_new_uint64(devc->cur_samplerate);
 433                 break;
 434         default:
 435                 return SR_ERR_NA;
 436         }
 437
 438         return ret;
 439 }
 440
 441 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 442 {
 443         struct dev_context *devc;
 444         int ret;
 445
 446         if (sdi->status != SR_ST_ACTIVE)
 447                 return SR_ERR_DEV_CLOSED;
 448
 449         devc = sdi->priv;
 450
 451         ret = SR_OK;
 452         switch (key) {
 453         case SR_CONF_SAMPLERATE:
 454                 devc->cur_samplerate = g_variant_get_uint64(data);
 455                 break;
 456         case SR_CONF_LIMIT_SAMPLES:
 457                 devc->limit_samples = g_variant_get_uint64(data);
 458                 break;
 459         default:
 460                 ret = SR_ERR_NA;
 461         }
 462
 463         return ret;
 464 }
 465
 466 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 467 {
 468         GVariant *gvar;
 469         GVariantBuilder gvb;
 470         int ret;
 471
 472         (void)sdi;
 473
 474         ret = SR_OK;
 475         switch (key) {
 476         case SR_CONF_SAMPLERATE:
 477                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 478                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 479                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 480                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 481                 *data = g_variant_builder_end(&gvb);
 482                 break;
 483         default:
 484                 return SR_ERR_NA;
 485         }
 486
 487         return ret;
 488 }
 489
 490 static void abort_acquisition(struct dev_context *devc)
 491 {
 492         int i;
 493
 494         devc->num_samples = -1;
 495
 496         for (i = devc->num_transfers - 1; i >= 0; i--) {
 497                 if (devc->transfers[i])
 498                         libusb_cancel_transfer(devc->transfers[i]);
 499         }
 500 }
 501
 502 static unsigned int bytes_per_ms(struct dev_context *devc)
 503 {
 504         return devc->cur_samplerate * devc->num_channels / 8000;
 505 }
 506
 507 static size_t get_buffer_size(struct dev_context *devc)
 508 {
 509         size_t s;
 510
 511         /*
 512          * The buffer should be large enough to hold 10ms of data and
 513          * a multiple of 512.
 514          */
 515         s = 10 * bytes_per_ms(devc);
 516         return (s + 511) & ~511;
 517 }
 518
 519 static unsigned int get_number_of_transfers(struct dev_context *devc)
 520 {
 521         unsigned int n;
 522
 523         /* Total buffer size should be able to hold about 500ms of data. */
 524         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 525
 526         if (n > NUM_SIMUL_TRANSFERS)
 527                 return NUM_SIMUL_TRANSFERS;
 528
 529         return n;
 530 }
 531
 532 static unsigned int get_timeout(struct dev_context *devc)
 533 {
 534         size_t total_size;
 535         unsigned int timeout;
 536
 537         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 538         timeout = total_size / bytes_per_ms(devc);
 539         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 540 }
 541
 542 static int configure_probes(const struct sr_dev_inst *sdi)
 543 {
 544         struct dev_context *devc;
 545         struct sr_probe *probe;
 546         GSList *l;
 547         uint16_t probe_bit;
 548
 549         devc = sdi->priv;
 550
 551         devc->cur_channels = 0;
 552         devc->num_channels = 0;
 553         for (l = sdi->probes; l; l = l->next) {
 554                 probe = (struct sr_probe *)l->data;
 555                 if (probe->enabled == FALSE)
 556                         continue;
 557
 558                 probe_bit = 1 << (probe->index);
 559
 560                 devc->cur_channels |= probe_bit;
 561
 562 #ifdef WORDS_BIGENDIAN
 563                 /* Output logic data should be stored in little endian
 564                    format.  To speed things up during conversion, do the
 565                    switcharoo here instead. */
 566
 567                 probe_bit = 1 << (probe->index ^ 8);
 568 #endif
 569
 570                 devc->channel_masks[devc->num_channels ++] = probe_bit;
 571         }
 572
 573         return SR_OK;
 574 }
 575
 576 static int receive_data(int fd, int revents, void *cb_data)
 577 {
 578         struct timeval tv;
 579         struct dev_context *devc;
 580         struct drv_context *drvc;
 581         const struct sr_dev_inst *sdi;
 582
 583         (void)fd;
 584         (void)revents;
 585
 586         sdi = cb_data;
 587         drvc = di->priv;
 588         devc = sdi->priv;
 589
 590         tv.tv_sec = tv.tv_usec = 0;
 591         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 592
 593         if (devc->num_samples == -2) {
 594                 saleae_logic16_abort_acquisition(sdi);
 595                 abort_acquisition(devc);
 596         }
 597
 598         return TRUE;
 599 }
 600
 601 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 602                                  void *cb_data)
 603 {
 604         struct dev_context *devc;
 605         struct drv_context *drvc;
 606         struct sr_usb_dev_inst *usb;
 607         struct libusb_transfer *transfer;
 608         const struct libusb_pollfd **lupfd;
 609         unsigned int i, timeout, num_transfers;
 610         int ret;
 611         unsigned char *buf;
 612         size_t size, convsize;
 613
 614         if (sdi->status != SR_ST_ACTIVE)
 615                 return SR_ERR_DEV_CLOSED;
 616
 617         drvc = di->priv;
 618         devc = sdi->priv;
 619         usb = sdi->conn;
 620
 621         /* Configures devc->cur_channels */
 622         if (configure_probes(sdi) != SR_OK) {
 623                 sr_err("Failed to configure probes.");
 624                 return SR_ERR;
 625         }
 626
 627         devc->cb_data = cb_data;
 628         devc->num_samples = 0;
 629         devc->empty_transfer_count = 0;
 630         devc->cur_channel = 0;
 631         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 632
 633         timeout = get_timeout(devc);
 634         num_transfers = get_number_of_transfers(devc);
 635         size = get_buffer_size(devc);
 636         convsize = (size / devc->num_channels + 2) * 16;
 637         devc->submitted_transfers = 0;
 638         devc->usbfd = NULL;
 639
 640         devc->convbuffer_size = convsize;
 641         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 642                 sr_err("Conversion buffer malloc failed.");
 643                 return SR_ERR_MALLOC;
 644         }
 645
 646         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 647         if (!devc->transfers) {
 648                 sr_err("USB transfers malloc failed.");
 649                 g_free(devc->convbuffer);
 650                 return SR_ERR_MALLOC;
 651         }
 652
 653         if ((ret = saleae_logic16_setup_acquisition(sdi, devc->cur_samplerate,
 654                                                     devc->cur_channels)) != SR_OK) {
 655                 g_free(devc->transfers);
 656                 g_free(devc->convbuffer);
 657                 return ret;
 658         }
 659
 660         devc->num_transfers = num_transfers;
 661         for (i = 0; i < num_transfers; i++) {
 662                 if (!(buf = g_try_malloc(size))) {
 663                         sr_err("USB transfer buffer malloc failed.");
 664                         if (devc->submitted_transfers)
 665                                 abort_acquisition(devc);
 666                         else {
 667                                 g_free(devc->transfers);
 668                                 g_free(devc->convbuffer);
 669                         }
 670                         return SR_ERR_MALLOC;
 671                 }
 672                 transfer = libusb_alloc_transfer(0);
 673                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 674                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 675                                 saleae_logic16_receive_transfer, devc, timeout);
 676                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 677                         sr_err("Failed to submit transfer: %s.",
 678                                libusb_error_name(ret));
 679                         libusb_free_transfer(transfer);
 680                         g_free(buf);
 681                         abort_acquisition(devc);
 682                         return SR_ERR;
 683                 }
 684                 devc->transfers[i] = transfer;
 685                 devc->submitted_transfers++;
 686         }
 687
 688         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 689         for (i = 0; lupfd[i]; i++);
 690         if (!(devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1)))) {
 691                 abort_acquisition(devc);
 692                 free(lupfd);
 693                 return SR_ERR;
 694         }
 695         for (i = 0; lupfd[i]; i++) {
 696                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 697                               timeout, receive_data, (void *)sdi);
 698                 devc->usbfd[i] = lupfd[i]->fd;
 699         }
 700         devc->usbfd[i] = -1;
 701         free(lupfd);
 702
 703         /* Send header packet to the session bus. */
 704         std_session_send_df_header(cb_data, LOG_PREFIX);
 705
 706         if ((ret = saleae_logic16_start_acquisition(sdi)) != SR_OK) {
 707                 abort_acquisition(devc);
 708                 return ret;
 709         }
 710
 711         return SR_OK;
 712 }
 713
 714 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 715 {
 716         int ret;
 717
 718         (void)cb_data;
 719
 720         if (sdi->status != SR_ST_ACTIVE)
 721                 return SR_ERR_DEV_CLOSED;
 722
 723         ret = saleae_logic16_abort_acquisition(sdi);
 724
 725         abort_acquisition(sdi->priv);
 726
 727         return ret;
 728 }
 729
 730 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 731         .name = "saleae-logic16",
 732         .longname = "Saleae Logic16",
 733         .api_version = 1,
 734         .init = init,
 735         .cleanup = cleanup,
 736         .scan = scan,
 737         .dev_list = dev_list,
 738         .dev_clear = dev_clear,
 739         .config_get = config_get,
 740         .config_set = config_set,
 741         .config_list = config_list,
 742         .dev_open = dev_open,
 743         .dev_close = dev_close,
 744         .dev_acquisition_start = dev_acquisition_start,
 745         .dev_acquisition_stop = dev_acquisition_stop,
 746         .priv = NULL,
 747 };