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 "config.h"
  27 #include "sigrok.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.firmware"
  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
 106 /*
 107  * Returns 1 if the device's configuration profile match the Logic firmware's
 108  * configuration, 0 otherwise.
 109  */
 110 int check_conf_profile(libusb_device *dev)
 111 {
 112         struct libusb_device_descriptor des;
 113         struct libusb_config_descriptor *conf_dsc = NULL;
 114         const struct libusb_interface_descriptor *intf_dsc;
 115         int ret = -1;
 116
 117         while (ret == -1) {
 118                 /* Assume it's not a Saleae Logic unless proven wrong. */
 119                 ret = 0;
 120
 121                 if (libusb_get_device_descriptor(dev, &des) != 0)
 122                         break;
 123
 124                 if (des.bNumConfigurations != 1)
 125                         /* Need exactly 1 configuration. */
 126                         break;
 127
 128                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 129                         break;
 130
 131                 if (conf_dsc->bNumInterfaces != 1)
 132                         /* Need exactly 1 interface. */
 133                         break;
 134
 135                 if (conf_dsc->interface[0].num_altsetting != 1)
 136                         /* Need just one alternate setting. */
 137                         break;
 138
 139                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 140                 if (intf_dsc->bNumEndpoints != 2)
 141                         /* Need 2 endpoints. */
 142                         break;
 143
 144                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 145                     (1 | LIBUSB_ENDPOINT_OUT))
 146                         /* First endpoint should be 1 (outbound). */
 147                         break;
 148
 149                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 150                     (2 | LIBUSB_ENDPOINT_IN))
 151                         /* First endpoint should be 2 (inbound). */
 152                         break;
 153
 154                 /* If we made it here, it must be a Saleae Logic. */
 155                 ret = 1;
 156         }
 157
 158         if (conf_dsc)
 159                 libusb_free_config_descriptor(conf_dsc);
 160
 161         return ret;
 162 }
 163
 164 static int opendev2(int device_index, struct sigrok_device_instance **sdi,
 165                     libusb_device *dev, struct libusb_device_descriptor *des,
 166                     int *skip)
 167 {
 168         int err;
 169
 170         if ((err = libusb_get_device_descriptor(dev, des))) {
 171                 g_warning("failed to get device descriptor: %d", err);
 172                 return -1;
 173         }
 174
 175         if (des->idVendor != USB_VENDOR || des->idProduct != USB_PRODUCT)
 176                 return 0;
 177
 178         if (*skip != device_index) {
 179                 /* Skip devices of this type that aren't the one we want. */
 180                 *skip += 1;
 181                 return 0;
 182         }
 183
 184         /*
 185          * Should check the bus here, since we know that already. But what are
 186          * we going to do if it doesn't match after the right number of skips?
 187          */
 188         if (!(err = libusb_open(dev, &((*sdi)->usb->devhdl)))) {
 189                 (*sdi)->usb->address = libusb_get_device_address(dev);
 190                 (*sdi)->status = ST_ACTIVE;
 191                 g_message("opened device %d on %d.%d interface %d",
 192                           (*sdi)->index, (*sdi)->usb->bus,
 193                           (*sdi)->usb->address, USB_INTERFACE);
 194         } else {
 195                 g_warning("failed to open device: %d", err);
 196                 *sdi = NULL;
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int opendev3(struct sigrok_device_instance **sdi, libusb_device *dev,
 203                     struct libusb_device_descriptor *des)
 204 {
 205         int err;
 206
 207         if ((err = libusb_get_device_descriptor(dev, des))) {
 208                 g_warning("failed to get device descriptor: %d", err);
 209                 return -1;
 210         }
 211
 212         if (des->idVendor != USB_VENDOR || des->idProduct != USB_PRODUCT)
 213                 return 0;
 214
 215         if (libusb_get_bus_number(dev) == (*sdi)->usb->bus
 216             && libusb_get_device_address(dev) == (*sdi)->usb->address) {
 217                 /* Found it. */
 218                 if (!(err = libusb_open(dev, &((*sdi)->usb->devhdl)))) {
 219                         (*sdi)->status = ST_ACTIVE;
 220                         g_message("opened device %d on %d.%d interface %d",
 221                                   (*sdi)->index, (*sdi)->usb->bus,
 222                                   (*sdi)->usb->address, USB_INTERFACE);
 223                 } else {
 224                         g_warning("failed to open device: %d", err);
 225                         *sdi = NULL;
 226                 }
 227         }
 228
 229         return 0;
 230 }
 231
 232 struct sigrok_device_instance *sl_open_device(int device_index)
 233 {
 234         struct sigrok_device_instance *sdi;
 235         libusb_device **devlist;
 236         struct libusb_device_descriptor des;
 237         int err, skip, i;
 238
 239         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 240                 return NULL;
 241
 242         libusb_get_device_list(usb_context, &devlist);
 243         if (sdi->status == ST_INITIALIZING) {
 244                 /*
 245                  * This device was renumerating last time we touched it.
 246                  * opendev() guarantees we've waited long enough for it to
 247                  * have booted properly, so now we need to find it on
 248                  * the bus and record its new address.
 249                  */
 250                 skip = 0;
 251                 for (i = 0; devlist[i]; i++) {
 252                         /* TODO: Error handling. */
 253                         err = opendev2(device_index, &sdi, devlist[i], &des,
 254                                        &skip);
 255                 }
 256         } else if (sdi->status == ST_INACTIVE) {
 257                 /*
 258                  * This device is fully enumerated, so we need to find this
 259                  * device by vendor, product, bus and address.
 260                  */
 261                 libusb_get_device_list(usb_context, &devlist);
 262                 for (i = 0; devlist[i]; i++) {
 263                         /* TODO: Error handling. */
 264                         err = opendev3(&sdi, devlist[i], &des);
 265                 }
 266         } else {
 267                 /* Status must be ST_ACTIVE, i.e. already in use... */
 268                 sdi = NULL;
 269         }
 270         libusb_free_device_list(devlist, 1);
 271
 272         if (sdi && sdi->status != ST_ACTIVE)
 273                 sdi = NULL;
 274
 275         return sdi;
 276 }
 277
 278 int upload_firmware(libusb_device *dev)
 279 {
 280         int ret;
 281
 282         ret = ezusb_upload_firmware(dev, USB_CONFIGURATION, FIRMWARE);
 283         if (ret != 0)
 284                 return 1;
 285
 286         /* Remember when the last firmware update was done. */
 287         g_get_current_time(&firmware_updated);
 288
 289         return 0;
 290 }
 291
 292 static void close_device(struct sigrok_device_instance *sdi)
 293 {
 294         if (sdi->usb->devhdl == NULL)
 295                 return;
 296
 297         g_message("closing device %d on %d.%d interface %d", sdi->index,
 298                   sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 299         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 300         libusb_close(sdi->usb->devhdl);
 301         sdi->usb->devhdl = NULL;
 302         sdi->status = ST_INACTIVE;
 303 }
 304
 305 static int configure_probes(GSList *probes)
 306 {
 307         struct probe *probe;
 308         GSList *l;
 309         int probe_bit, stage, i;
 310         char *tc;
 311
 312         probe_mask = 0;
 313         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 314                 trigger_mask[i] = 0;
 315                 trigger_value[i] = 0;
 316         }
 317
 318         stage = -1;
 319         for (l = probes; l; l = l->next) {
 320                 probe = (struct probe *)l->data;
 321                 if (probe->enabled == FALSE)
 322                         continue;
 323                 probe_bit = 1 << (probe->index - 1);
 324                 probe_mask |= probe_bit;
 325                 if (probe->trigger) {
 326                         stage = 0;
 327                         for (tc = probe->trigger; *tc; tc++) {
 328                                 trigger_mask[stage] |= probe_bit;
 329                                 if (*tc == '1')
 330                                         trigger_value[stage] |= probe_bit;
 331                                 stage++;
 332                                 if (stage > NUM_TRIGGER_STAGES)
 333                                         return SIGROK_ERR;
 334                         }
 335                 }
 336         }
 337
 338         if (stage == -1)
 339                 /*
 340                  * We didn't configure any triggers, make sure acquisition
 341                  * doesn't wait for any.
 342                  */
 343                 trigger_stage = TRIGGER_FIRED;
 344         else
 345                 trigger_stage = 0;
 346
 347         return SIGROK_OK;
 348 }
 349
 350 /*
 351  * API callbacks
 352  */
 353
 354 static int hw_init(char *deviceinfo)
 355 {
 356         struct sigrok_device_instance *sdi;
 357         struct libusb_device_descriptor des;
 358         libusb_device **devlist;
 359         int err, devcnt, i;
 360
 361         /* QUICK HACK */
 362         deviceinfo = deviceinfo;
 363
 364         if (libusb_init(&usb_context) != 0) {
 365                 g_warning("Failed to initialize USB.");
 366                 return 0;
 367         }
 368         libusb_set_debug(usb_context, 3);
 369
 370         /* Find all Saleae Logic devices and upload firmware to all of them. */
 371         devcnt = 0;
 372         libusb_get_device_list(usb_context, &devlist);
 373         for (i = 0; devlist[i]; i++) {
 374                 err = libusb_get_device_descriptor(devlist[i], &des);
 375                 if (err != 0) {
 376                         g_warning("failed to get device descriptor: %d", err);
 377                         continue;
 378                 }
 379
 380                 if (des.idVendor != USB_VENDOR || des.idProduct != USB_PRODUCT)
 381                         continue; /* Not a Saleae Logic... */
 382
 383                 sdi = sigrok_device_instance_new(devcnt, ST_INITIALIZING,
 384                         USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
 385                 if (!sdi)
 386                         return 0;
 387                 device_instances = g_slist_append(device_instances, sdi);
 388
 389                 if (check_conf_profile(devlist[i]) == 0) {
 390                         /*
 391                          * Continue on the off chance that the device is in a
 392                          * working state. TODO: Could maybe try a USB reset,
 393                          * or uploading the firmware again.
 394                          */
 395                         if (upload_firmware(devlist[i]) > 0)
 396                                 g_warning("firmware upload failed for "
 397                                           "device %d", devcnt);
 398
 399                         sdi->usb = usb_device_instance_new
 400                                 (libusb_get_bus_number(devlist[i]), 0, NULL);
 401                 } else {
 402                         /* Already has the firmware, so fix the new address. */
 403                         sdi->usb = usb_device_instance_new
 404                             (libusb_get_bus_number(devlist[i]),
 405                              libusb_get_device_address(devlist[i]), NULL);
 406                 }
 407                 devcnt++;
 408         }
 409         libusb_free_device_list(devlist, 1);
 410
 411         return devcnt;
 412 }
 413
 414 static int hw_opendev(int device_index)
 415 {
 416         GTimeVal cur_time;
 417         struct sigrok_device_instance *sdi;
 418         int timediff, err;
 419         unsigned int cur, upd;
 420
 421         if (firmware_updated.tv_sec > 0) {
 422                 /* Firmware was recently uploaded. */
 423                 g_get_current_time(&cur_time);
 424                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 425                 upd = firmware_updated.tv_sec * 1000 +
 426                       firmware_updated.tv_usec / 1000;
 427                 timediff = cur - upd;
 428                 if (timediff < FIRMWARE_RENUM_DELAY) {
 429                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 430                         g_message("waiting %d ms for device to reset",
 431                                   timediff);
 432                         g_usleep(timediff * 1000);
 433                         firmware_updated.tv_sec = 0;
 434                 }
 435         }
 436
 437         if (!(sdi = sl_open_device(device_index))) {
 438                 g_warning("unable to open device");
 439                 return SIGROK_ERR;
 440         }
 441
 442         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 443         if (err != 0) {
 444                 g_warning("Unable to claim interface: %d", err);
 445                 return SIGROK_ERR;
 446         }
 447
 448         if (cur_samplerate == 0) {
 449                 /* Samplerate hasn't been set; default to the slowest one. */
 450                 if (hw_set_configuration(device_index, HWCAP_SAMPLERATE,
 451                     &supported_samplerates[0]) == SIGROK_ERR)
 452                         return SIGROK_ERR;
 453         }
 454
 455         return SIGROK_OK;
 456 }
 457
 458 static void hw_closedev(int device_index)
 459 {
 460         struct sigrok_device_instance *sdi;
 461
 462         if ((sdi = get_sigrok_device_instance(device_instances, device_index)))
 463                 close_device(sdi);
 464 }
 465
 466 static void hw_cleanup(void)
 467 {
 468         GSList *l;
 469
 470         /* Properly close all devices... */
 471         for (l = device_instances; l; l = l->next)
 472                 close_device((struct sigrok_device_instance *)l->data);
 473
 474         /* ...and free all their memory. */
 475         for (l = device_instances; l; l = l->next)
 476                 g_free(l->data);
 477         g_slist_free(device_instances);
 478         device_instances = NULL;
 479
 480         if (usb_context)
 481                 libusb_exit(usb_context);
 482         usb_context = NULL;
 483 }
 484
 485 static void *hw_get_device_info(int device_index, int device_info_id)
 486 {
 487         struct sigrok_device_instance *sdi;
 488         void *info = NULL;
 489
 490         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 491                 return NULL;
 492
 493         switch (device_info_id) {
 494         case DI_INSTANCE:
 495                 info = sdi;
 496                 break;
 497         case DI_NUM_PROBES:
 498                 info = GINT_TO_POINTER(NUM_PROBES);
 499                 break;
 500         case DI_SAMPLERATES:
 501                 info = &samplerates;
 502                 break;
 503         case DI_TRIGGER_TYPES:
 504                 info = TRIGGER_TYPES;
 505                 break;
 506         case DI_CUR_SAMPLERATE:
 507                 info = &cur_samplerate;
 508                 break;
 509         }
 510
 511         return info;
 512 }
 513
 514 static int hw_get_status(int device_index)
 515 {
 516         struct sigrok_device_instance *sdi;
 517
 518         sdi = get_sigrok_device_instance(device_instances, device_index);
 519         if (sdi)
 520                 return sdi->status;
 521         else
 522                 return ST_NOT_FOUND;
 523 }
 524
 525 static int *hw_get_capabilities(void)
 526 {
 527         return capabilities;
 528 }
 529
 530 static int set_configuration_samplerate(struct sigrok_device_instance *sdi,
 531                                         uint64_t samplerate)
 532 {
 533         uint8_t divider;
 534         int ret, result, i;
 535         unsigned char buf[2];
 536
 537         for (i = 0; supported_samplerates[i]; i++) {
 538                 if (supported_samplerates[i] == samplerate)
 539                         break;
 540         }
 541         if (supported_samplerates[i] == 0)
 542                 return SIGROK_ERR_SAMPLERATE;
 543
 544         divider = (uint8_t) (48 / (float)(samplerate / 1000000)) - 1;
 545
 546         g_message("setting samplerate to %" PRIu64 " Hz (divider %d)",
 547                   samplerate, divider);
 548         buf[0] = 0x01;
 549         buf[1] = divider;
 550         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 551                                    buf, 2, &result, 500);
 552         if (ret != 0) {
 553                 g_warning("failed to set samplerate: %d", ret);
 554                 return SIGROK_ERR;
 555         }
 556         cur_samplerate = samplerate;
 557
 558         return SIGROK_OK;
 559 }
 560
 561 static int hw_set_configuration(int device_index, int capability, void *value)
 562 {
 563         struct sigrok_device_instance *sdi;
 564         int ret;
 565         uint64_t *tmp_u64;
 566
 567         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 568                 return SIGROK_ERR;
 569
 570         if (capability == HWCAP_SAMPLERATE) {
 571                 tmp_u64 = value;
 572                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 573         } else if (capability == HWCAP_PROBECONFIG) {
 574                 ret = configure_probes((GSList *) value);
 575         } else if (capability == HWCAP_LIMIT_SAMPLES) {
 576                 limit_samples = strtoull(value, NULL, 10);
 577                 ret = SIGROK_OK;
 578         } else {
 579                 ret = SIGROK_ERR;
 580         }
 581
 582         return ret;
 583 }
 584
 585 static int receive_data(int fd, int revents, void *user_data)
 586 {
 587         struct timeval tv;
 588
 589         /* QUICK HACK */
 590         fd = fd;
 591         revents = revents;
 592         user_data = user_data;
 593
 594         tv.tv_sec = tv.tv_usec = 0;
 595         libusb_handle_events_timeout(usb_context, &tv);
 596
 597         return TRUE;
 598 }
 599
 600 static void trigger_helper(int i, unsigned char *cur_buf,
 601                            struct datafeed_packet *packet, void *user_data,
 602                            int *trigger_offset)
 603 {
 604         if ((cur_buf[i] & trigger_mask[trigger_stage])
 605             == trigger_value[trigger_stage]) {
 606                 /* Match on this trigger stage. */
 607                 trigger_buffer[trigger_stage] = cur_buf[i];
 608                 trigger_stage++;
 609                 if (trigger_stage == NUM_TRIGGER_STAGES
 610                     || trigger_mask[trigger_stage] == 0) {
 611                         /* Match on all trigger stages, we're done. */
 612                         *trigger_offset = i + 1;
 613
 614                         /*
 615                          * TODO: Send pre-trigger buffer to session bus.
 616                          * Tell the frontend we hit the trigger here.
 617                          */
 618                         packet->type = DF_TRIGGER;
 619                         packet->length = 0;
 620                         session_bus(user_data, packet);
 621
 622                         /*
 623                          * Send the samples that triggered it, since we're
 624                          * skipping past them.
 625                          */
 626                         packet->type = DF_LOGIC8;
 627                         packet->length = trigger_stage;
 628                         packet->payload = trigger_buffer;
 629                         session_bus(user_data, packet);
 630                         // break; // FIXME???
 631
 632                         trigger_stage = TRIGGER_FIRED;
 633                 }
 634                 return;
 635         }
 636
 637         /*
 638          * We had a match before, but not in the next sample. However, we may
 639          * have a match on this stage in the next bit -- trigger on 0001 will
 640          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 641          * the next sample from the one that matched originally, which the
 642          * counter increment at the end of the loop takes care of.
 643          */
 644         if (trigger_stage > 0) {
 645                 i -= trigger_stage;
 646                 if (i < -1)
 647                         i = -1; /* Oops, went back past this buffer. */
 648                 /* Reset trigger stage. */
 649                 trigger_stage = 0;
 650         }
 651 }
 652
 653 void receive_transfer(struct libusb_transfer *transfer)
 654 {
 655         static int num_samples = 0;
 656         static int empty_transfer_count = 0;
 657         struct datafeed_packet packet;
 658         void *user_data;
 659         int cur_buflen, trigger_offset, i;
 660         unsigned char *cur_buf, *new_buf;
 661
 662         /* hw_stop_acquisition() is telling us to stop. */
 663         if (transfer == NULL)
 664                 num_samples = -1;
 665
 666         /*
 667          * If acquisition has already ended, just free any queued up
 668          * transfer that come in.
 669          */
 670         if (num_samples == -1) {
 671                 libusb_free_transfer(transfer);
 672                 return;
 673         }
 674
 675         g_message("receive_transfer(): status %d received %d bytes",
 676                   transfer->status, transfer->actual_length);
 677
 678         /* Save incoming transfer before reusing the transfer struct. */
 679         cur_buf = transfer->buffer;
 680         cur_buflen = transfer->actual_length;
 681         user_data = transfer->user_data;
 682
 683         /* Fire off a new request. */
 684         new_buf = g_malloc(4096);
 685         transfer->buffer = new_buf;
 686         transfer->length = 4096;
 687         if (libusb_submit_transfer(transfer) != 0) {
 688                 /* TODO: Stop session? */
 689                 g_warning("eek");
 690         }
 691
 692         if (cur_buflen == 0) {
 693                 empty_transfer_count++;
 694                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 695                         /*
 696                          * The FX2 gave up. End the acquisition, the frontend
 697                          * will work out that the samplecount is short.
 698                          */
 699                         packet.type = DF_END;
 700                         session_bus(user_data, &packet);
 701                         num_samples = -1;
 702                 }
 703                 return;
 704         } else {
 705                 empty_transfer_count = 0;
 706         }
 707
 708         trigger_offset = 0;
 709         if (trigger_stage >= 0) {
 710                 for (i = 0; i < cur_buflen; i++) {
 711                         trigger_helper(i, cur_buf, &packet, user_data,
 712                                        &trigger_offset);
 713                 }
 714         }
 715
 716         if (trigger_stage == TRIGGER_FIRED) {
 717                 /* Send the incoming transfer to the session bus. */
 718                 packet.type = DF_LOGIC8;
 719                 packet.length = cur_buflen - trigger_offset;
 720                 packet.payload = cur_buf + trigger_offset;
 721                 session_bus(user_data, &packet);
 722                 g_free(cur_buf);
 723
 724                 num_samples += cur_buflen;
 725                 if ((unsigned int)num_samples > limit_samples) {
 726                         /* End the acquisition. */
 727                         packet.type = DF_END;
 728                         session_bus(user_data, &packet);
 729                         num_samples = -1;
 730                 }
 731         } else {
 732                 /*
 733                  * TODO: Buffer pre-trigger data in capture
 734                  * ratio-sized buffer.
 735                  */
 736         }
 737 }
 738
 739 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 740 {
 741         struct sigrok_device_instance *sdi;
 742         struct datafeed_packet *packet;
 743         struct datafeed_header *header;
 744         struct libusb_transfer *transfer;
 745         const struct libusb_pollfd **lupfd;
 746         int size, i;
 747         unsigned char *buf;
 748
 749         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 750                 return SIGROK_ERR;
 751
 752         packet = g_malloc(sizeof(struct datafeed_packet));
 753         header = g_malloc(sizeof(struct datafeed_header));
 754         if (!packet || !header)
 755                 return SIGROK_ERR;
 756
 757         /* Start with 2K transfer, subsequently increased to 4K. */
 758         size = 2048;
 759         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 760                 buf = g_malloc(size);
 761                 transfer = libusb_alloc_transfer(0);
 762                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 763                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 764                                 receive_transfer, session_device_id, 40);
 765                 if (libusb_submit_transfer(transfer) != 0) {
 766                         /* TODO: Free them all. */
 767                         libusb_free_transfer(transfer);
 768                         g_free(buf);
 769                         return SIGROK_ERR;
 770                 }
 771                 size = 4096;
 772         }
 773
 774         lupfd = libusb_get_pollfds(usb_context);
 775         for (i = 0; lupfd[i]; i++)
 776                 source_add(lupfd[i]->fd, lupfd[i]->events, -1, receive_data,
 777                            NULL);
 778         free(lupfd);
 779
 780         packet->type = DF_HEADER;
 781         packet->length = sizeof(struct datafeed_header);
 782         packet->payload = (unsigned char *)header;
 783         header->feed_version = 1;
 784         gettimeofday(&header->starttime, NULL);
 785         header->samplerate = cur_samplerate;
 786         header->protocol_id = PROTO_RAW;
 787         header->num_probes = NUM_PROBES;
 788         session_bus(session_device_id, packet);
 789         g_free(header);
 790         g_free(packet);
 791
 792         return SIGROK_OK;
 793 }
 794
 795 /* This stops acquisition on ALL devices, ignoring device_index. */
 796 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 797 {
 798         struct datafeed_packet packet;
 799
 800         /* QUICK HACK */
 801         device_index = device_index;
 802
 803         packet.type = DF_END;
 804         session_bus(session_device_id, &packet);
 805
 806         receive_transfer(NULL);
 807
 808         /* TODO: Need to cancel and free any queued up transfers. */
 809 }
 810
 811 struct device_plugin saleae_logic_plugin_info = {
 812         "saleae-logic",
 813         1,
 814         hw_init,
 815         hw_cleanup,
 816
 817         hw_opendev,
 818         hw_closedev,
 819         hw_get_device_info,
 820         hw_get_status,
 821         hw_get_capabilities,
 822         hw_set_configuration,
 823         hw_start_acquisition,
 824         hw_stop_acquisition,
 825 };