hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010 Bert Vermeulen <bert@biot.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 <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/time.h>
  23 #include <inttypes.h>
  24 #include <glib.h>
  25 #include <libusb.h>
  26 #include <sigrok.h>
  27 #include "config.h"
  28
  29 #define USB_VENDOR                      0x0925
  30 #define USB_PRODUCT                     0x3881
  31 #define USB_VENDOR_NAME                 "Saleae"
  32 #define USB_MODEL_NAME                  "Logic"
  33 #define USB_MODEL_VERSION               ""
  34
  35 #define USB_INTERFACE                   0
  36 #define USB_CONFIGURATION               1
  37 #define NUM_PROBES                      8
  38 #define NUM_TRIGGER_STAGES              4
  39 #define TRIGGER_TYPES                   "01"
  40 #define FIRMWARE                        FIRMWARE_DIR "/saleae-logic.fw"
  41
  42 /* delay in ms */
  43 #define FIRMWARE_RENUM_DELAY            2000
  44 #define NUM_SIMUL_TRANSFERS             10
  45 #define MAX_EMPTY_TRANSFERS             (NUM_SIMUL_TRANSFERS * 2)
  46
  47 /* Software trigger implementation: positive values indicate trigger stage. */
  48 #define TRIGGER_FIRED                   -1
  49
  50 /* There is only one model Saleae Logic, and this is what it supports: */
  51 static int capabilities[] = {
  52         HWCAP_LOGIC_ANALYZER,
  53         HWCAP_SAMPLERATE,
  54
  55         /* These are really implemented in the driver, not the hardware. */
  56         HWCAP_LIMIT_SAMPLES,
  57         0,
  58 };
  59
  60 /* List of struct sigrok_device_instance, maintained by opendev()/closedev(). */
  61 static GSList *device_instances = NULL;
  62
  63 /*
  64  * Since we can't keep track of a Saleae Logic device after upgrading the
  65  * firmware -- it re-enumerates into a different device address after the
  66  * upgrade -- this is like a global lock. No device will open until a proper
  67  * delay after the last device was upgraded.
  68  */
  69 GTimeVal firmware_updated = { 0, 0 };
  70
  71 static libusb_context *usb_context = NULL;
  72
  73 static uint64_t supported_samplerates[] = {
  74         KHZ(200),
  75         KHZ(250),
  76         KHZ(500),
  77         MHZ(1),
  78         MHZ(2),
  79         MHZ(4),
  80         MHZ(8),
  81         MHZ(12),
  82         MHZ(16),
  83         MHZ(24),
  84         0,
  85 };
  86
  87 static struct samplerates samplerates = {
  88         KHZ(200),
  89         MHZ(24),
  90         0,
  91         supported_samplerates,
  92 };
  93
  94 /* TODO: All of these should go in a device-specific struct. */
  95 static uint64_t cur_samplerate = 0;
  96 static uint64_t limit_samples = 0;
  97 static uint8_t probe_mask = 0;
  98 static uint8_t trigger_mask[NUM_TRIGGER_STAGES] = { 0 };
  99 static uint8_t trigger_value[NUM_TRIGGER_STAGES] = { 0 };
 100 static uint8_t trigger_buffer[NUM_TRIGGER_STAGES] = { 0 };
 101
 102 int trigger_stage = TRIGGER_FIRED;
 103
 104 static int hw_set_configuration(int device_index, int capability, void *value);
 105 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
 106
 107 /**
 108  * Check the USB configuration to determine if this is a Saleae Logic.
 109  *
 110  * @return 1 if the device's configuration profile match the Logic firmware's
 111  *         configuration, 0 otherwise.
 112  */
 113 int check_conf_profile(libusb_device *dev)
 114 {
 115         struct libusb_device_descriptor des;
 116         struct libusb_config_descriptor *conf_dsc = NULL;
 117         const struct libusb_interface_descriptor *intf_dsc;
 118         int ret = -1;
 119
 120         while (ret == -1) {
 121                 /* Assume it's not a Saleae Logic unless proven wrong. */
 122                 ret = 0;
 123
 124                 if (libusb_get_device_descriptor(dev, &des) != 0)
 125                         break;
 126
 127                 if (des.bNumConfigurations != 1)
 128                         /* Need exactly 1 configuration. */
 129                         break;
 130
 131                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 132                         break;
 133
 134                 if (conf_dsc->bNumInterfaces != 1)
 135                         /* Need exactly 1 interface. */
 136                         break;
 137
 138                 if (conf_dsc->interface[0].num_altsetting != 1)
 139                         /* Need just one alternate setting. */
 140                         break;
 141
 142                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 143                 if (intf_dsc->bNumEndpoints != 2)
 144                         /* Need 2 endpoints. */
 145                         break;
 146
 147                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 148                     (1 | LIBUSB_ENDPOINT_OUT))
 149                         /* First endpoint should be 1 (outbound). */
 150                         break;
 151
 152                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 153                     (2 | LIBUSB_ENDPOINT_IN))
 154                         /* First endpoint should be 2 (inbound). */
 155                         break;
 156
 157                 /* If we made it here, it must be a Saleae Logic. */
 158                 ret = 1;
 159         }
 160
 161         if (conf_dsc)
 162                 libusb_free_config_descriptor(conf_dsc);
 163
 164         return ret;
 165 }
 166
 167 struct sigrok_device_instance *sl_open_device(int device_index)
 168 {
 169         struct sigrok_device_instance *sdi;
 170         libusb_device **devlist;
 171         struct libusb_device_descriptor des;
 172         int err, skip, i;
 173
 174         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 175                 return NULL;
 176
 177         libusb_get_device_list(usb_context, &devlist);
 178         if (sdi->status == ST_INITIALIZING) {
 179                 /*
 180                  * This device was renumerating last time we touched it.
 181                  * opendev() guarantees we've waited long enough for it to
 182                  * have booted properly, so now we need to find it on
 183                  * the bus and record its new address.
 184                  */
 185                 skip = 0;
 186                 for (i = 0; devlist[i]; i++) {
 187                         /* TODO: Error handling. */
 188                         err = opendev2(device_index, &sdi, devlist[i], &des,
 189                                        &skip, USB_VENDOR, USB_PRODUCT,
 190                                        USB_INTERFACE);
 191                 }
 192         } else if (sdi->status == ST_INACTIVE) {
 193                 /*
 194                  * This device is fully enumerated, so we need to find this
 195                  * device by vendor, product, bus and address.
 196                  */
 197                 libusb_get_device_list(usb_context, &devlist);
 198                 for (i = 0; devlist[i]; i++) {
 199                         /* TODO: Error handling. */
 200                         err = opendev3(&sdi, devlist[i], &des, USB_VENDOR,
 201                                        USB_PRODUCT, USB_INTERFACE);
 202                 }
 203         } else {
 204                 /* Status must be ST_ACTIVE, i.e. already in use... */
 205                 sdi = NULL;
 206         }
 207         libusb_free_device_list(devlist, 1);
 208
 209         if (sdi && sdi->status != ST_ACTIVE)
 210                 sdi = NULL;
 211
 212         return sdi;
 213 }
 214
 215 int upload_firmware(libusb_device *dev)
 216 {
 217         int ret;
 218
 219         ret = ezusb_upload_firmware(dev, USB_CONFIGURATION, FIRMWARE);
 220         if (ret != 0)
 221                 return 1;
 222
 223         /* Remember when the last firmware update was done. */
 224         g_get_current_time(&firmware_updated);
 225
 226         return 0;
 227 }
 228
 229 static void close_device(struct sigrok_device_instance *sdi)
 230 {
 231         if (sdi->usb->devhdl == NULL)
 232                 return;
 233
 234         g_message("closing device %d on %d.%d interface %d", sdi->index,
 235                   sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 236         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 237         libusb_close(sdi->usb->devhdl);
 238         sdi->usb->devhdl = NULL;
 239         sdi->status = ST_INACTIVE;
 240 }
 241
 242 static int configure_probes(GSList *probes)
 243 {
 244         struct probe *probe;
 245         GSList *l;
 246         int probe_bit, stage, i;
 247         char *tc;
 248
 249         probe_mask = 0;
 250         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 251                 trigger_mask[i] = 0;
 252                 trigger_value[i] = 0;
 253         }
 254
 255         stage = -1;
 256         for (l = probes; l; l = l->next) {
 257                 probe = (struct probe *)l->data;
 258                 if (probe->enabled == FALSE)
 259                         continue;
 260                 probe_bit = 1 << (probe->index - 1);
 261                 probe_mask |= probe_bit;
 262                 if (!(probe->trigger))
 263                         continue;
 264
 265                 stage = 0;
 266                 for (tc = probe->trigger; *tc; tc++) {
 267                         trigger_mask[stage] |= probe_bit;
 268                         if (*tc == '1')
 269                                 trigger_value[stage] |= probe_bit;
 270                         stage++;
 271                         if (stage > NUM_TRIGGER_STAGES)
 272                                 return SIGROK_ERR;
 273                 }
 274         }
 275
 276         if (stage == -1)
 277                 /*
 278                  * We didn't configure any triggers, make sure acquisition
 279                  * doesn't wait for any.
 280                  */
 281                 trigger_stage = TRIGGER_FIRED;
 282         else
 283                 trigger_stage = 0;
 284
 285         return SIGROK_OK;
 286 }
 287
 288 /*
 289  * API callbacks
 290  */
 291
 292 static int hw_init(char *deviceinfo)
 293 {
 294         struct sigrok_device_instance *sdi;
 295         struct libusb_device_descriptor des;
 296         libusb_device **devlist;
 297         int err, devcnt, i;
 298
 299         /* QUICK HACK */
 300         deviceinfo = deviceinfo;
 301
 302         if (libusb_init(&usb_context) != 0) {
 303                 g_warning("Failed to initialize USB.");
 304                 return 0;
 305         }
 306         libusb_set_debug(usb_context, 3);
 307
 308         /* Find all Saleae Logic devices and upload firmware to all of them. */
 309         devcnt = 0;
 310         libusb_get_device_list(usb_context, &devlist);
 311         for (i = 0; devlist[i]; i++) {
 312                 err = libusb_get_device_descriptor(devlist[i], &des);
 313                 if (err != 0) {
 314                         g_warning("failed to get device descriptor: %d", err);
 315                         continue;
 316                 }
 317
 318                 if (des.idVendor != USB_VENDOR || des.idProduct != USB_PRODUCT)
 319                         continue; /* Not a Saleae Logic... */
 320
 321                 sdi = sigrok_device_instance_new(devcnt, ST_INITIALIZING,
 322                         USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
 323                 if (!sdi)
 324                         return 0;
 325                 device_instances = g_slist_append(device_instances, sdi);
 326
 327                 if (check_conf_profile(devlist[i]) == 0) {
 328                         /*
 329                          * Continue on the off chance that the device is in a
 330                          * working state. TODO: Could maybe try a USB reset,
 331                          * or uploading the firmware again.
 332                          */
 333                         if (upload_firmware(devlist[i]) > 0)
 334                                 g_warning("firmware upload failed for "
 335                                           "device %d", devcnt);
 336
 337                         sdi->usb = usb_device_instance_new
 338                                 (libusb_get_bus_number(devlist[i]), 0, NULL);
 339                 } else {
 340                         /* Already has the firmware, so fix the new address. */
 341                         sdi->usb = usb_device_instance_new
 342                             (libusb_get_bus_number(devlist[i]),
 343                              libusb_get_device_address(devlist[i]), NULL);
 344                 }
 345                 devcnt++;
 346         }
 347         libusb_free_device_list(devlist, 1);
 348
 349         return devcnt;
 350 }
 351
 352 static int hw_opendev(int device_index)
 353 {
 354         GTimeVal cur_time;
 355         struct sigrok_device_instance *sdi;
 356         int timediff, err;
 357         unsigned int cur, upd;
 358
 359         if (firmware_updated.tv_sec > 0) {
 360                 /* Firmware was recently uploaded. */
 361                 g_get_current_time(&cur_time);
 362                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 363                 upd = firmware_updated.tv_sec * 1000 +
 364                       firmware_updated.tv_usec / 1000;
 365                 timediff = cur - upd;
 366                 if (timediff < FIRMWARE_RENUM_DELAY) {
 367                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 368                         g_message("waiting %d ms for device to reset",
 369                                   timediff);
 370                         g_usleep(timediff * 1000);
 371                         firmware_updated.tv_sec = 0;
 372                 }
 373         }
 374
 375         if (!(sdi = sl_open_device(device_index))) {
 376                 g_warning("unable to open device");
 377                 return SIGROK_ERR;
 378         }
 379
 380         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 381         if (err != 0) {
 382                 g_warning("Unable to claim interface: %d", err);
 383                 return SIGROK_ERR;
 384         }
 385
 386         if (cur_samplerate == 0) {
 387                 /* Samplerate hasn't been set; default to the slowest one. */
 388                 if (hw_set_configuration(device_index, HWCAP_SAMPLERATE,
 389                     &supported_samplerates[0]) == SIGROK_ERR)
 390                         return SIGROK_ERR;
 391         }
 392
 393         return SIGROK_OK;
 394 }
 395
 396 static void hw_closedev(int device_index)
 397 {
 398         struct sigrok_device_instance *sdi;
 399
 400         if ((sdi = get_sigrok_device_instance(device_instances, device_index)))
 401                 close_device(sdi);
 402 }
 403
 404 static void hw_cleanup(void)
 405 {
 406         GSList *l;
 407
 408         /* Properly close all devices... */
 409         for (l = device_instances; l; l = l->next)
 410                 close_device((struct sigrok_device_instance *)l->data);
 411
 412         /* ...and free all their memory. */
 413         for (l = device_instances; l; l = l->next)
 414                 g_free(l->data);
 415         g_slist_free(device_instances);
 416         device_instances = NULL;
 417
 418         if (usb_context)
 419                 libusb_exit(usb_context);
 420         usb_context = NULL;
 421 }
 422
 423 static void *hw_get_device_info(int device_index, int device_info_id)
 424 {
 425         struct sigrok_device_instance *sdi;
 426         void *info = NULL;
 427
 428         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 429                 return NULL;
 430
 431         switch (device_info_id) {
 432         case DI_INSTANCE:
 433                 info = sdi;
 434                 break;
 435         case DI_NUM_PROBES:
 436                 info = GINT_TO_POINTER(NUM_PROBES);
 437                 break;
 438         case DI_SAMPLERATES:
 439                 info = &samplerates;
 440                 break;
 441         case DI_TRIGGER_TYPES:
 442                 info = TRIGGER_TYPES;
 443                 break;
 444         case DI_CUR_SAMPLERATE:
 445                 info = &cur_samplerate;
 446                 break;
 447         }
 448
 449         return info;
 450 }
 451
 452 static int hw_get_status(int device_index)
 453 {
 454         struct sigrok_device_instance *sdi;
 455
 456         sdi = get_sigrok_device_instance(device_instances, device_index);
 457         if (sdi)
 458                 return sdi->status;
 459         else
 460                 return ST_NOT_FOUND;
 461 }
 462
 463 static int *hw_get_capabilities(void)
 464 {
 465         return capabilities;
 466 }
 467
 468 static int set_configuration_samplerate(struct sigrok_device_instance *sdi,
 469                                         uint64_t samplerate)
 470 {
 471         uint8_t divider;
 472         int ret, result, i;
 473         unsigned char buf[2];
 474
 475         for (i = 0; supported_samplerates[i]; i++) {
 476                 if (supported_samplerates[i] == samplerate)
 477                         break;
 478         }
 479         if (supported_samplerates[i] == 0)
 480                 return SIGROK_ERR_SAMPLERATE;
 481
 482         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 483
 484         g_message("setting samplerate to %" PRIu64 " Hz (divider %d)",
 485                   samplerate, divider);
 486         buf[0] = 0x01;
 487         buf[1] = divider;
 488         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 489                                    buf, 2, &result, 500);
 490         if (ret != 0) {
 491                 g_warning("failed to set samplerate: %d", ret);
 492                 return SIGROK_ERR;
 493         }
 494         cur_samplerate = samplerate;
 495
 496         return SIGROK_OK;
 497 }
 498
 499 static int hw_set_configuration(int device_index, int capability, void *value)
 500 {
 501         struct sigrok_device_instance *sdi;
 502         int ret;
 503         uint64_t *tmp_u64;
 504
 505         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 506                 return SIGROK_ERR;
 507
 508         if (capability == HWCAP_SAMPLERATE) {
 509                 tmp_u64 = value;
 510                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 511         } else if (capability == HWCAP_PROBECONFIG) {
 512                 ret = configure_probes((GSList *) value);
 513         } else if (capability == HWCAP_LIMIT_SAMPLES) {
 514                 limit_samples = strtoull(value, NULL, 10);
 515                 ret = SIGROK_OK;
 516         } else {
 517                 ret = SIGROK_ERR;
 518         }
 519
 520         return ret;
 521 }
 522
 523 static int receive_data(int fd, int revents, void *user_data)
 524 {
 525         struct timeval tv;
 526
 527         /* QUICK HACK */
 528         fd = fd;
 529         revents = revents;
 530         user_data = user_data;
 531
 532         tv.tv_sec = tv.tv_usec = 0;
 533         libusb_handle_events_timeout(usb_context, &tv);
 534
 535         return TRUE;
 536 }
 537
 538 static void trigger_helper(int i, unsigned char *cur_buf,
 539                            struct datafeed_packet *packet, void *user_data,
 540                            int *trigger_offset)
 541 {
 542         if ((cur_buf[i] & trigger_mask[trigger_stage])
 543             == trigger_value[trigger_stage]) {
 544                 /* Match on this trigger stage. */
 545                 trigger_buffer[trigger_stage] = cur_buf[i];
 546                 trigger_stage++;
 547                 if (trigger_stage == NUM_TRIGGER_STAGES
 548                     || trigger_mask[trigger_stage] == 0) {
 549                         /* Match on all trigger stages, we're done. */
 550                         *trigger_offset = i + 1;
 551
 552                         /*
 553                          * TODO: Send pre-trigger buffer to session bus.
 554                          * Tell the frontend we hit the trigger here.
 555                          */
 556                         packet->type = DF_TRIGGER;
 557                         packet->length = 0;
 558                         session_bus(user_data, packet);
 559
 560                         /*
 561                          * Send the samples that triggered it, since we're
 562                          * skipping past them.
 563                          */
 564                         packet->type = DF_LOGIC8;
 565                         packet->length = trigger_stage;
 566                         packet->payload = trigger_buffer;
 567                         session_bus(user_data, packet);
 568                         // break; // FIXME???
 569
 570                         trigger_stage = TRIGGER_FIRED;
 571                 }
 572                 return;
 573         }
 574
 575         /*
 576          * We had a match before, but not in the next sample. However, we may
 577          * have a match on this stage in the next bit -- trigger on 0001 will
 578          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 579          * the next sample from the one that matched originally, which the
 580          * counter increment at the end of the loop takes care of.
 581          */
 582         if (trigger_stage > 0) {
 583                 i -= trigger_stage;
 584                 if (i < -1)
 585                         i = -1; /* Oops, went back past this buffer. */
 586                 /* Reset trigger stage. */
 587                 trigger_stage = 0;
 588         }
 589 }
 590
 591 void receive_transfer(struct libusb_transfer *transfer)
 592 {
 593         static int num_samples = 0;
 594         static int empty_transfer_count = 0;
 595         struct datafeed_packet packet;
 596         void *user_data;
 597         int cur_buflen, trigger_offset, i;
 598         unsigned char *cur_buf, *new_buf;
 599
 600         /* hw_stop_acquisition() is telling us to stop. */
 601         if (transfer == NULL)
 602                 num_samples = -1;
 603
 604         /*
 605          * If acquisition has already ended, just free any queued up
 606          * transfer that come in.
 607          */
 608         if (num_samples == -1) {
 609                 if (transfer)
 610                         libusb_free_transfer(transfer);
 611                 return;
 612         }
 613
 614         g_message("receive_transfer(): status %d received %d bytes",
 615                   transfer->status, transfer->actual_length);
 616
 617         /* Save incoming transfer before reusing the transfer struct. */
 618         cur_buf = transfer->buffer;
 619         cur_buflen = transfer->actual_length;
 620         user_data = transfer->user_data;
 621
 622         /* Fire off a new request. */
 623         new_buf = g_malloc(4096);
 624         transfer->buffer = new_buf;
 625         transfer->length = 4096;
 626         if (libusb_submit_transfer(transfer) != 0) {
 627                 /* TODO: Stop session? */
 628                 g_warning("eek");
 629         }
 630
 631         if (cur_buflen == 0) {
 632                 empty_transfer_count++;
 633                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 634                         /*
 635                          * The FX2 gave up. End the acquisition, the frontend
 636                          * will work out that the samplecount is short.
 637                          */
 638                         hw_stop_acquisition(-1, user_data);
 639                 }
 640                 return;
 641         } else {
 642                 empty_transfer_count = 0;
 643         }
 644
 645         trigger_offset = 0;
 646         if (trigger_stage >= 0) {
 647                 for (i = 0; i < cur_buflen; i++) {
 648                         trigger_helper(i, cur_buf, &packet, user_data,
 649                                        &trigger_offset);
 650                 }
 651         }
 652
 653         if (trigger_stage == TRIGGER_FIRED) {
 654                 /* Send the incoming transfer to the session bus. */
 655                 packet.type = DF_LOGIC8;
 656                 packet.length = cur_buflen - trigger_offset;
 657                 packet.payload = cur_buf + trigger_offset;
 658                 session_bus(user_data, &packet);
 659                 g_free(cur_buf);
 660
 661                 num_samples += cur_buflen;
 662                 if ((unsigned int)num_samples > limit_samples) {
 663                         hw_stop_acquisition(-1, user_data);
 664                 }
 665         } else {
 666                 /*
 667                  * TODO: Buffer pre-trigger data in capture
 668                  * ratio-sized buffer.
 669                  */
 670         }
 671 }
 672
 673 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 674 {
 675         struct sigrok_device_instance *sdi;
 676         struct datafeed_packet *packet;
 677         struct datafeed_header *header;
 678         struct libusb_transfer *transfer;
 679         const struct libusb_pollfd **lupfd;
 680         int size, i;
 681         unsigned char *buf;
 682
 683         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 684                 return SIGROK_ERR;
 685
 686         packet = g_malloc(sizeof(struct datafeed_packet));
 687         header = g_malloc(sizeof(struct datafeed_header));
 688         if (!packet || !header)
 689                 return SIGROK_ERR;
 690
 691         /* Start with 2K transfer, subsequently increased to 4K. */
 692         size = 2048;
 693         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 694                 buf = g_malloc(size);
 695                 transfer = libusb_alloc_transfer(0);
 696                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 697                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 698                                 receive_transfer, session_device_id, 40);
 699                 if (libusb_submit_transfer(transfer) != 0) {
 700                         /* TODO: Free them all. */
 701                         libusb_free_transfer(transfer);
 702                         g_free(buf);
 703                         return SIGROK_ERR;
 704                 }
 705                 size = 4096;
 706         }
 707
 708         lupfd = libusb_get_pollfds(usb_context);
 709         for (i = 0; lupfd[i]; i++)
 710                 source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 711                            NULL);
 712         free(lupfd);
 713
 714         packet->type = DF_HEADER;
 715         packet->length = sizeof(struct datafeed_header);
 716         packet->payload = (unsigned char *)header;
 717         header->feed_version = 1;
 718         gettimeofday(&header->starttime, NULL);
 719         header->samplerate = cur_samplerate;
 720         header->protocol_id = PROTO_RAW;
 721         header->num_probes = NUM_PROBES;
 722         session_bus(session_device_id, packet);
 723         g_free(header);
 724         g_free(packet);
 725
 726         return SIGROK_OK;
 727 }
 728
 729 /* This stops acquisition on ALL devices, ignoring device_index. */
 730 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 731 {
 732         struct datafeed_packet packet;
 733
 734         /* QUICK HACK */
 735         device_index = device_index;
 736
 737         packet.type = DF_END;
 738         session_bus(session_device_id, &packet);
 739
 740         receive_transfer(NULL);
 741
 742         /* TODO: Need to cancel and free any queued up transfers. */
 743 }
 744
 745 struct device_plugin saleae_logic_plugin_info = {
 746         "saleae-logic",
 747         1,
 748         hw_init,
 749         hw_cleanup,
 750
 751         hw_opendev,
 752         hw_closedev,
 753         hw_get_device_info,
 754         hw_get_status,
 755         hw_get_capabilities,
 756         hw_set_configuration,
 757         hw_start_acquisition,
 758         hw_stop_acquisition,
 759 };