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 int32_t hwopts[] = {
  44         SR_CONF_CONN,
  45 };
  46
  47 static const int32_t hwcaps[] = {
  48         SR_CONF_LOGIC_ANALYZER,
  49         SR_CONF_SAMPLERATE,
  50
  51         /* These are really implemented in the driver, not the hardware. */
  52         SR_CONF_LIMIT_SAMPLES,
  53         SR_CONF_CONTINUOUS,
  54 };
  55
  56 static const char *probe_names[NUM_PROBES + 1] = {
  57         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  58         "9", "10", "11", "12", "13", "14", "15",
  59         NULL,
  60 };
  61
  62 static const uint64_t samplerates[] = {
  63         SR_KHZ(500),
  64         SR_MHZ(1),
  65         SR_MHZ(2),
  66         SR_MHZ(4),
  67         SR_MHZ(5),
  68         SR_MHZ(8),
  69         SR_MHZ(10),
  70         SR_KHZ(12500),
  71         SR_MHZ(16),
  72         SR_MHZ(25),
  73         SR_MHZ(32),
  74         SR_MHZ(40),
  75         SR_MHZ(80),
  76         SR_MHZ(100),
  77 };
  78
  79 static int init(struct sr_context *sr_ctx)
  80 {
  81         return std_init(sr_ctx, di, LOG_PREFIX);
  82 }
  83
  84 static gboolean check_conf_profile(libusb_device *dev)
  85 {
  86         struct libusb_device_descriptor des;
  87         struct libusb_device_handle *hdl;
  88         gboolean ret;
  89         unsigned char strdesc[64];
  90
  91         hdl = NULL;
  92         ret = FALSE;
  93         while (!ret) {
  94                 /* Assume the FW has not been loaded, unless proven wrong. */
  95                 if (libusb_get_device_descriptor(dev, &des) != 0)
  96                         break;
  97
  98                 if (libusb_open(dev, &hdl) != 0)
  99                         break;
 100
 101                 if (libusb_get_string_descriptor_ascii(hdl,
 102                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 103                         break;
 104                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 105                         break;
 106
 107                 if (libusb_get_string_descriptor_ascii(hdl,
 108                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 109                         break;
 110                 if (strcmp((const char *)strdesc, "Logic S/16"))
 111                         break;
 112
 113                 /* If we made it here, it must be a configured Logic16. */
 114                 ret = TRUE;
 115         }
 116         if (hdl)
 117                 libusb_close(hdl);
 118
 119         return ret;
 120 }
 121
 122 static GSList *scan(GSList *options)
 123 {
 124         struct drv_context *drvc;
 125         struct dev_context *devc;
 126         struct sr_dev_inst *sdi;
 127         struct sr_usb_dev_inst *usb;
 128         struct sr_probe *probe;
 129         struct sr_config *src;
 130         GSList *l, *devices, *conn_devices;
 131         struct libusb_device_descriptor des;
 132         libusb_device **devlist;
 133         int devcnt, ret, i, j;
 134         const char *conn;
 135
 136         drvc = di->priv;
 137
 138         conn = NULL;
 139         for (l = options; l; l = l->next) {
 140                 src = l->data;
 141                 switch (src->key) {
 142                 case SR_CONF_CONN:
 143                         conn = g_variant_get_string(src->data, NULL);
 144                         break;
 145                 }
 146         }
 147         if (conn)
 148                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 149         else
 150                 conn_devices = NULL;
 151
 152         /* Find all Logic16 devices and upload firmware to them. */
 153         devices = NULL;
 154         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 155         for (i = 0; devlist[i]; i++) {
 156                 if (conn) {
 157                         usb = NULL;
 158                         for (l = conn_devices; l; l = l->next) {
 159                                 usb = l->data;
 160                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 161                                     && usb->address == libusb_get_device_address(devlist[i]))
 162                                         break;
 163                         }
 164                         if (!l)
 165                                 /* This device matched none of the ones that
 166                                  * matched the conn specification. */
 167                                 continue;
 168                 }
 169
 170                 if ((ret = libusb_get_device_descriptor( devlist[i], &des)) != 0) {
 171                         sr_warn("Failed to get device descriptor: %s.",
 172                                 libusb_error_name(ret));
 173                         continue;
 174                 }
 175
 176                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 177                         continue;
 178
 179                 devcnt = g_slist_length(drvc->instances);
 180                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 181                                       "Saleae", "Logic16", NULL);
 182                 if (!sdi)
 183                         return NULL;
 184                 sdi->driver = di;
 185
 186                 for (j = 0; probe_names[j]; j++) {
 187                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 188                                                    probe_names[j])))
 189                                 return NULL;
 190                         sdi->probes = g_slist_append(sdi->probes, probe);
 191                 }
 192
 193                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 194                         return NULL;
 195                 sdi->priv = devc;
 196                 drvc->instances = g_slist_append(drvc->instances, sdi);
 197                 devices = g_slist_append(devices, sdi);
 198
 199                 if (check_conf_profile(devlist[i])) {
 200                         /* Already has the firmware, so fix the new address. */
 201                         sr_dbg("Found a Logic16 device.");
 202                         sdi->status = SR_ST_INACTIVE;
 203                         sdi->inst_type = SR_INST_USB;
 204                         sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
 205                                                         libusb_get_device_address(devlist[i]), NULL);
 206                 } else {
 207                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 208                                                   FX2_FIRMWARE) == SR_OK)
 209                                 /* Store when this device's FW was updated. */
 210                                 devc->fw_updated = g_get_monotonic_time();
 211                         else
 212                                 sr_err("Firmware upload failed for "
 213                                        "device %d.", devcnt);
 214                         sdi->inst_type = SR_INST_USB;
 215                         sdi->conn = sr_usb_dev_inst_new (libusb_get_bus_number(devlist[i]),
 216                                                          0xff, NULL);
 217                 }
 218         }
 219         libusb_free_device_list(devlist, 1);
 220         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 221
 222         return devices;
 223 }
 224
 225 static GSList *dev_list(void)
 226 {
 227         struct drv_context *drvc;
 228
 229         drvc = di->priv;
 230
 231         return drvc->instances;
 232 }
 233
 234 static int dev_clear(void)
 235 {
 236         return std_dev_clear(di, NULL);
 237 }
 238
 239 static int logic16_dev_open(struct sr_dev_inst *sdi)
 240 {
 241         libusb_device **devlist;
 242         struct sr_usb_dev_inst *usb;
 243         struct libusb_device_descriptor des;
 244         struct drv_context *drvc;
 245         int ret, skip, i, device_count;
 246
 247         drvc = di->priv;
 248         usb = sdi->conn;
 249
 250         if (sdi->status == SR_ST_ACTIVE)
 251                 /* Device is already in use. */
 252                 return SR_ERR;
 253
 254         skip = 0;
 255         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 256         if (device_count < 0) {
 257                 sr_err("Failed to get device list: %s.",
 258                        libusb_error_name(device_count));
 259                 return SR_ERR;
 260         }
 261
 262         for (i = 0; i < device_count; i++) {
 263                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 264                         sr_err("Failed to get device descriptor: %s.",
 265                                libusb_error_name(ret));
 266                         continue;
 267                 }
 268
 269                 if (des.idVendor != LOGIC16_VID
 270                     || des.idProduct != LOGIC16_PID)
 271                         continue;
 272
 273                 if (sdi->status == SR_ST_INITIALIZING) {
 274                         if (skip != sdi->index) {
 275                                 /* Skip devices of this type that aren't the one we want. */
 276                                 skip += 1;
 277                                 continue;
 278                         }
 279                 } else if (sdi->status == SR_ST_INACTIVE) {
 280                         /*
 281                          * This device is fully enumerated, so we need to find
 282                          * this device by vendor, product, bus and address.
 283                          */
 284                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 285                                 || libusb_get_device_address(devlist[i]) != usb->address)
 286                                 /* This is not the one. */
 287                                 continue;
 288                 }
 289
 290                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 291                         if (usb->address == 0xff)
 292                                 /*
 293                                  * First time we touch this device after FW
 294                                  * upload, so we don't know the address yet.
 295                                  */
 296                                 usb->address = libusb_get_device_address(devlist[i]);
 297                 } else {
 298                         sr_err("Failed to open device: %s.",
 299                                libusb_error_name(ret));
 300                         break;
 301                 }
 302
 303                 if ((ret = saleae_logic16_init_device(sdi)) != SR_OK) {
 304                         sr_err("Failed to init device.");
 305                         break;
 306                 }
 307
 308                 sdi->status = SR_ST_ACTIVE;
 309                 sr_info("Opened device %d on %d.%d, "
 310                         "interface %d.",
 311                         sdi->index, usb->bus, usb->address,
 312                         USB_INTERFACE);
 313
 314                 break;
 315         }
 316         libusb_free_device_list(devlist, 1);
 317
 318         if (sdi->status != SR_ST_ACTIVE)
 319                 return SR_ERR;
 320
 321         return SR_OK;
 322 }
 323
 324 static int dev_open(struct sr_dev_inst *sdi)
 325 {
 326         struct sr_usb_dev_inst *usb;
 327         struct dev_context *devc;
 328         int ret;
 329         int64_t timediff_us, timediff_ms;
 330
 331         devc = sdi->priv;
 332         usb = sdi->conn;
 333
 334         /*
 335          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 336          * milliseconds for the FX2 to renumerate.
 337          */
 338         ret = SR_ERR;
 339         if (devc->fw_updated > 0) {
 340                 sr_info("Waiting for device to reset.");
 341                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 342                 g_usleep(300 * 1000);
 343                 timediff_ms = 0;
 344                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 345                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 346                                 break;
 347                         g_usleep(100 * 1000);
 348
 349                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 350                         timediff_ms = timediff_us / 1000;
 351                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 352                 }
 353                 if (ret != SR_OK) {
 354                         sr_err("Device failed to renumerate.");
 355                         return SR_ERR;
 356                 }
 357                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 358         } else {
 359                 sr_info("Firmware upload was not needed.");
 360                 ret = logic16_dev_open(sdi);
 361         }
 362
 363         if (ret != SR_OK) {
 364                 sr_err("Unable to open device.");
 365                 return SR_ERR;
 366         }
 367
 368         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 369         if (ret != 0) {
 370                 switch(ret) {
 371                 case LIBUSB_ERROR_BUSY:
 372                         sr_err("Unable to claim USB interface. Another "
 373                                "program or driver has already claimed it.");
 374                         break;
 375                 case LIBUSB_ERROR_NO_DEVICE:
 376                         sr_err("Device has been disconnected.");
 377                         break;
 378                 default:
 379                         sr_err("Unable to claim interface: %s.",
 380                                libusb_error_name(ret));
 381                         break;
 382                 }
 383
 384                 return SR_ERR;
 385         }
 386
 387         if (devc->cur_samplerate == 0) {
 388                 /* Samplerate hasn't been set; default to the slowest one. */
 389                 devc->cur_samplerate = samplerates[0];
 390         }
 391
 392         return SR_OK;
 393 }
 394
 395 static int dev_close(struct sr_dev_inst *sdi)
 396 {
 397         struct sr_usb_dev_inst *usb;
 398
 399         usb = sdi->conn;
 400         if (usb->devhdl == NULL)
 401                 return SR_ERR;
 402
 403         sr_info("Closing device %d on %d.%d interface %d.",
 404                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 405         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 406         libusb_close(usb->devhdl);
 407         usb->devhdl = NULL;
 408         sdi->status = SR_ST_INACTIVE;
 409
 410         return SR_OK;
 411 }
 412
 413 static int cleanup(void)
 414 {
 415         int ret;
 416         struct drv_context *drvc;
 417
 418         if (!(drvc = di->priv))
 419                 /* Can get called on an unused driver, doesn't matter. */
 420                 return SR_OK;
 421
 422         ret = dev_clear();
 423         g_free(drvc);
 424         di->priv = NULL;
 425
 426         return ret;
 427 }
 428
 429 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 430 {
 431         struct dev_context *devc;
 432         struct sr_usb_dev_inst *usb;
 433         char str[128];
 434         int ret;
 435
 436         ret = SR_OK;
 437         switch (key) {
 438         case SR_CONF_CONN:
 439                 if (!sdi || !sdi->conn)
 440                         return SR_ERR_ARG;
 441                 usb = sdi->conn;
 442                 if (usb->address == 255)
 443                         /* Device still needs to re-enumerate after firmware
 444                          * upload, so we don't know its (future) address. */
 445                         return SR_ERR;
 446                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 447                 *data = g_variant_new_string(str);
 448                 break;
 449         case SR_CONF_SAMPLERATE:
 450                 if (!sdi)
 451                         return SR_ERR;
 452                 devc = sdi->priv;
 453                 *data = g_variant_new_uint64(devc->cur_samplerate);
 454                 break;
 455         default:
 456                 return SR_ERR_NA;
 457         }
 458
 459         return ret;
 460 }
 461
 462 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 463 {
 464         struct dev_context *devc;
 465         int ret;
 466
 467         if (sdi->status != SR_ST_ACTIVE)
 468                 return SR_ERR_DEV_CLOSED;
 469
 470         devc = sdi->priv;
 471
 472         ret = SR_OK;
 473         switch (key) {
 474         case SR_CONF_SAMPLERATE:
 475                 devc->cur_samplerate = g_variant_get_uint64(data);
 476                 break;
 477         case SR_CONF_LIMIT_SAMPLES:
 478                 devc->limit_samples = g_variant_get_uint64(data);
 479                 break;
 480         default:
 481                 ret = SR_ERR_NA;
 482         }
 483
 484         return ret;
 485 }
 486
 487 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 488 {
 489         GVariant *gvar;
 490         GVariantBuilder gvb;
 491         int ret;
 492
 493         (void)sdi;
 494
 495         ret = SR_OK;
 496         switch (key) {
 497         case SR_CONF_SCAN_OPTIONS:
 498                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 499                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 500                 break;
 501         case SR_CONF_DEVICE_OPTIONS:
 502                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 503                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 504                 break;
 505         case SR_CONF_SAMPLERATE:
 506                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 507                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 508                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 509                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 510                 *data = g_variant_builder_end(&gvb);
 511                 break;
 512         default:
 513                 return SR_ERR_NA;
 514         }
 515
 516         return ret;
 517 }
 518
 519 static void abort_acquisition(struct dev_context *devc)
 520 {
 521         int i;
 522
 523         devc->num_samples = -1;
 524
 525         for (i = devc->num_transfers - 1; i >= 0; i--) {
 526                 if (devc->transfers[i])
 527                         libusb_cancel_transfer(devc->transfers[i]);
 528         }
 529 }
 530
 531 static unsigned int bytes_per_ms(struct dev_context *devc)
 532 {
 533         return devc->cur_samplerate * devc->num_channels / 8000;
 534 }
 535
 536 static size_t get_buffer_size(struct dev_context *devc)
 537 {
 538         size_t s;
 539
 540         /*
 541          * The buffer should be large enough to hold 10ms of data and
 542          * a multiple of 512.
 543          */
 544         s = 10 * bytes_per_ms(devc);
 545         return (s + 511) & ~511;
 546 }
 547
 548 static unsigned int get_number_of_transfers(struct dev_context *devc)
 549 {
 550         unsigned int n;
 551
 552         /* Total buffer size should be able to hold about 500ms of data. */
 553         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 554
 555         if (n > NUM_SIMUL_TRANSFERS)
 556                 return NUM_SIMUL_TRANSFERS;
 557
 558         return n;
 559 }
 560
 561 static unsigned int get_timeout(struct dev_context *devc)
 562 {
 563         size_t total_size;
 564         unsigned int timeout;
 565
 566         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 567         timeout = total_size / bytes_per_ms(devc);
 568         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 569 }
 570
 571 static int configure_probes(const struct sr_dev_inst *sdi)
 572 {
 573         struct dev_context *devc;
 574         struct sr_probe *probe;
 575         GSList *l;
 576         uint16_t probe_bit;
 577
 578         devc = sdi->priv;
 579
 580         devc->cur_channels = 0;
 581         devc->num_channels = 0;
 582         for (l = sdi->probes; l; l = l->next) {
 583                 probe = (struct sr_probe *)l->data;
 584                 if (probe->enabled == FALSE)
 585                         continue;
 586
 587                 probe_bit = 1 << (probe->index);
 588
 589                 devc->cur_channels |= probe_bit;
 590
 591 #ifdef WORDS_BIGENDIAN
 592                 /* Output logic data should be stored in little endian
 593                    format.  To speed things up during conversion, do the
 594                    switcharoo here instead. */
 595
 596                 probe_bit = 1 << (probe->index ^ 8);
 597 #endif
 598
 599                 devc->channel_masks[devc->num_channels ++] = probe_bit;
 600         }
 601
 602         return SR_OK;
 603 }
 604
 605 static int receive_data(int fd, int revents, void *cb_data)
 606 {
 607         struct timeval tv;
 608         struct dev_context *devc;
 609         struct drv_context *drvc;
 610         const struct sr_dev_inst *sdi;
 611
 612         (void)fd;
 613         (void)revents;
 614
 615         sdi = cb_data;
 616         drvc = di->priv;
 617         devc = sdi->priv;
 618
 619         tv.tv_sec = tv.tv_usec = 0;
 620         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 621
 622         if (devc->num_samples == -2) {
 623                 saleae_logic16_abort_acquisition(sdi);
 624                 abort_acquisition(devc);
 625         }
 626
 627         return TRUE;
 628 }
 629
 630 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 631                                  void *cb_data)
 632 {
 633         struct dev_context *devc;
 634         struct drv_context *drvc;
 635         struct sr_usb_dev_inst *usb;
 636         struct libusb_transfer *transfer;
 637         const struct libusb_pollfd **lupfd;
 638         unsigned int i, timeout, num_transfers;
 639         int ret;
 640         unsigned char *buf;
 641         size_t size, convsize;
 642
 643         if (sdi->status != SR_ST_ACTIVE)
 644                 return SR_ERR_DEV_CLOSED;
 645
 646         drvc = di->priv;
 647         devc = sdi->priv;
 648         usb = sdi->conn;
 649
 650         /* Configures devc->cur_channels */
 651         if (configure_probes(sdi) != SR_OK) {
 652                 sr_err("Failed to configure probes.");
 653                 return SR_ERR;
 654         }
 655
 656         devc->cb_data = cb_data;
 657         devc->num_samples = 0;
 658         devc->empty_transfer_count = 0;
 659         devc->cur_channel = 0;
 660         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 661
 662         timeout = get_timeout(devc);
 663         num_transfers = get_number_of_transfers(devc);
 664         size = get_buffer_size(devc);
 665         convsize = (size / devc->num_channels + 2) * 16;
 666         devc->submitted_transfers = 0;
 667         devc->usbfd = NULL;
 668
 669         devc->convbuffer_size = convsize;
 670         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 671                 sr_err("Conversion buffer malloc failed.");
 672                 return SR_ERR_MALLOC;
 673         }
 674
 675         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 676         if (!devc->transfers) {
 677                 sr_err("USB transfers malloc failed.");
 678                 g_free(devc->convbuffer);
 679                 return SR_ERR_MALLOC;
 680         }
 681
 682         if ((ret = saleae_logic16_setup_acquisition(sdi, devc->cur_samplerate,
 683                                                     devc->cur_channels)) != SR_OK) {
 684                 g_free(devc->transfers);
 685                 g_free(devc->convbuffer);
 686                 return ret;
 687         }
 688
 689         devc->num_transfers = num_transfers;
 690         for (i = 0; i < num_transfers; i++) {
 691                 if (!(buf = g_try_malloc(size))) {
 692                         sr_err("USB transfer buffer malloc failed.");
 693                         if (devc->submitted_transfers)
 694                                 abort_acquisition(devc);
 695                         else {
 696                                 g_free(devc->transfers);
 697                                 g_free(devc->convbuffer);
 698                         }
 699                         return SR_ERR_MALLOC;
 700                 }
 701                 transfer = libusb_alloc_transfer(0);
 702                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 703                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 704                                 saleae_logic16_receive_transfer, devc, timeout);
 705                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 706                         sr_err("Failed to submit transfer: %s.",
 707                                libusb_error_name(ret));
 708                         libusb_free_transfer(transfer);
 709                         g_free(buf);
 710                         abort_acquisition(devc);
 711                         return SR_ERR;
 712                 }
 713                 devc->transfers[i] = transfer;
 714                 devc->submitted_transfers++;
 715         }
 716
 717         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 718         for (i = 0; lupfd[i]; i++);
 719         if (!(devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1)))) {
 720                 abort_acquisition(devc);
 721                 free(lupfd);
 722                 return SR_ERR;
 723         }
 724         for (i = 0; lupfd[i]; i++) {
 725                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 726                               timeout, receive_data, (void *)sdi);
 727                 devc->usbfd[i] = lupfd[i]->fd;
 728         }
 729         devc->usbfd[i] = -1;
 730         free(lupfd);
 731
 732         /* Send header packet to the session bus. */
 733         std_session_send_df_header(cb_data, LOG_PREFIX);
 734
 735         if ((ret = saleae_logic16_start_acquisition(sdi)) != SR_OK) {
 736                 abort_acquisition(devc);
 737                 return ret;
 738         }
 739
 740         return SR_OK;
 741 }
 742
 743 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 744 {
 745         int ret;
 746
 747         (void)cb_data;
 748
 749         if (sdi->status != SR_ST_ACTIVE)
 750                 return SR_ERR_DEV_CLOSED;
 751
 752         ret = saleae_logic16_abort_acquisition(sdi);
 753
 754         abort_acquisition(sdi->priv);
 755
 756         return ret;
 757 }
 758
 759 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 760         .name = "saleae-logic16",
 761         .longname = "Saleae Logic16",
 762         .api_version = 1,
 763         .init = init,
 764         .cleanup = cleanup,
 765         .scan = scan,
 766         .dev_list = dev_list,
 767         .dev_clear = dev_clear,
 768         .config_get = config_get,
 769         .config_set = config_set,
 770         .config_list = config_list,
 771         .dev_open = dev_open,
 772         .dev_close = dev_close,
 773         .dev_acquisition_start = dev_acquisition_start,
 774         .dev_acquisition_stop = dev_acquisition_stop,
 775         .priv = NULL,
 776 };