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 };
  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 int trigger_stage = TRIGGER_FIRED;
 102
 103 static int hw_set_configuration(int device_index, int capability, void *value);
 104
 105 /* returns 1 if the device's configuration profile match the Logic firmware's
 106  * configuration, 0 otherwise
 107  */
 108 int check_conf_profile(libusb_device *dev)
 109 {
 110         struct libusb_device_descriptor des;
 111         struct libusb_config_descriptor *conf_dsc = NULL;
 112         const struct libusb_interface_descriptor *intf_dsc;
 113         int ret = -1;
 114
 115         while (ret == -1) {
 116                 /* Assume it's not a Saleae Logic unless proven wrong. */
 117                 ret = 0;
 118
 119                 if (libusb_get_device_descriptor(dev, &des) != 0)
 120                         break;
 121
 122                 if (des.bNumConfigurations != 1)
 123                         /* Need exactly 1 configuration. */
 124                         break;
 125
 126                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 127                         break;
 128
 129                 if (conf_dsc->bNumInterfaces != 1)
 130                         /* Need exactly 1 interface. */
 131                         break;
 132
 133                 if (conf_dsc->interface[0].num_altsetting != 1)
 134                         /* Need just one alternate setting. */
 135                         break;
 136
 137                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 138                 if (intf_dsc->bNumEndpoints != 2)
 139                         /* Need 2 endpoints. */
 140                         break;
 141
 142                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 143                     (1 | LIBUSB_ENDPOINT_OUT))
 144                         /* First endpoint should be 1 (outbound). */
 145                         break;
 146
 147                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 148                     (2 | LIBUSB_ENDPOINT_IN))
 149                         /* First endpoint should be 2 (inbound). */
 150                         break;
 151
 152                 /* If we made it here, it must be a Saleae Logic. */
 153                 ret = 1;
 154         }
 155
 156         if (conf_dsc)
 157                 libusb_free_config_descriptor(conf_dsc);
 158
 159         return ret;
 160 }
 161
 162 struct sigrok_device_instance *sl_open_device(int device_index)
 163 {
 164         struct sigrok_device_instance *sdi;
 165         libusb_device **devlist;
 166         struct libusb_device_descriptor des;
 167         int err, skip, i;
 168
 169         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 170                 return NULL;
 171
 172         libusb_get_device_list(usb_context, &devlist);
 173         if (sdi->status == ST_INITIALIZING) {
 174                 /*
 175                  * This device was renumerating last time we touched it.
 176                  * opendev() guarantees we've waited long enough for it to
 177                  * have booted properly, so now we need to find it on
 178                  * the bus and record its new address.
 179                  */
 180                 skip = 0;
 181                 for (i = 0; devlist[i]; i++) {
 182                         if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 183                                 g_warning("failed to get device descriptor: %d",
 184                                           err);
 185                                 continue;
 186                         }
 187
 188                         if (des.idVendor == USB_VENDOR
 189                             && des.idProduct == USB_PRODUCT) {
 190                                 if (skip != device_index) {
 191                                         /*
 192                                          * Skip past devices of this type that
 193                                          * aren't the one we want.
 194                                          */
 195                                         skip++;
 196                                         continue;
 197                                 }
 198
 199                                 /*
 200                                  * Should check the bus here, since we know
 201                                  * that already... but what are we going to do
 202                                  * if it doesn't match after the right number
 203                                  * of skips?
 204                                  */
 205                                 if (!(err = libusb_open(devlist[i],
 206                                                  &(sdi->usb->devhdl)))) {
 207                                         sdi->usb->address = libusb_get_device_address(devlist [i]);
 208                                         sdi->status = ST_ACTIVE;
 209                                         g_message("opened device %d on %d.%d "
 210                                              "interface %d",
 211                                              sdi->index, sdi->usb->bus,
 212                                              sdi->usb->address, USB_INTERFACE);
 213                                 } else {
 214                                         g_warning("failed to open device: %d",
 215                                                   err);
 216                                         sdi = NULL;
 217                                 }
 218                         }
 219                 }
 220         } else if (sdi->status == ST_INACTIVE) {
 221                 /*
 222                  * This device is fully enumerated, so we need to find this
 223                  * device by vendor, product, bus and address.
 224                  */
 225                 libusb_get_device_list(usb_context, &devlist);
 226                 for (i = 0; devlist[i]; i++) {
 227                         if ((err =
 228                              libusb_get_device_descriptor(devlist[i], &des))) {
 229                                 g_warning("failed to get device descriptor: %d",
 230                                           err);
 231                                 continue;
 232                         }
 233
 234                         if (des.idVendor == USB_VENDOR
 235                             && des.idProduct == USB_PRODUCT) {
 236                                 if (libusb_get_bus_number(devlist[i]) ==
 237                                     sdi->usb->bus
 238                                     && libusb_get_device_address(devlist[i]) ==
 239                                     sdi->usb->address) {
 240                                         /* Found it. */
 241                                         if (!(err = libusb_open(devlist[i],
 242                                                     &(sdi->usb->devhdl)))) {
 243                                                 sdi->status = ST_ACTIVE;
 244                                                 g_message("opened device %d on "
 245                                                      "%d.%d interface %d",
 246                                                      sdi->index, sdi->usb->bus,
 247                                                      sdi->usb->address,
 248                                                      USB_INTERFACE);
 249                                         } else {
 250                                                 g_warning("failed to open device: %d", err);
 251                                                 sdi = NULL;
 252                                         }
 253                                 }
 254                         }
 255                 }
 256         } else {
 257                 /* Status must be ST_ACTIVE, i.e. already in use... */
 258                 sdi = NULL;
 259         }
 260         libusb_free_device_list(devlist, 1);
 261
 262         if (sdi && sdi->status != ST_ACTIVE)
 263                 sdi = NULL;
 264
 265         return sdi;
 266 }
 267
 268 int upload_firmware(libusb_device *dev)
 269 {
 270         struct libusb_device_handle *hdl;
 271         int err;
 272
 273         g_message("uploading firmware to device on %d.%d",
 274                   libusb_get_bus_number(dev), libusb_get_device_address(dev));
 275
 276         err = libusb_open(dev, &hdl);
 277         if (err != 0) {
 278                 g_warning("failed to open device: %d", err);
 279                 return 1;
 280         }
 281
 282         err = libusb_set_configuration(hdl, USB_CONFIGURATION);
 283         if (err != 0) {
 284                 g_warning("Unable to set configuration: %d", err);
 285                 return 1;
 286         }
 287
 288         if ((ezusb_reset(hdl, 1)) < 0)
 289                 return 1;
 290
 291         if (ezusb_install_firmware(hdl, FIRMWARE) != 0)
 292                 return 1;
 293
 294         if ((ezusb_reset(hdl, 0)) < 0)
 295                 return 1;
 296
 297         libusb_close(hdl);
 298
 299         /* Remember when the last firmware update was done. */
 300         g_get_current_time(&firmware_updated);
 301
 302         return 0;
 303 }
 304
 305 static void close_device(struct sigrok_device_instance *sdi)
 306 {
 307         if (sdi->usb->devhdl) {
 308                 g_message("closing device %d on %d.%d interface %d", sdi->index,
 309                           sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 310                 libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 311                 libusb_close(sdi->usb->devhdl);
 312                 sdi->usb->devhdl = NULL;
 313                 sdi->status = ST_INACTIVE;
 314         }
 315 }
 316
 317 static int configure_probes(GSList * probes)
 318 {
 319         struct probe *probe;
 320         GSList *l;
 321         int probe_bit, stage, i;
 322         char *tc;
 323
 324         probe_mask = 0;
 325         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 326                 trigger_mask[i] = 0;
 327                 trigger_value[i] = 0;
 328         }
 329
 330         stage = -1;
 331         for (l = probes; l; l = l->next) {
 332                 probe = (struct probe *)l->data;
 333                 if (probe->enabled == FALSE)
 334                         continue;
 335                 probe_bit = 1 << (probe->index - 1);
 336                 probe_mask |= probe_bit;
 337                 if (probe->trigger) {
 338                         stage = 0;
 339                         for (tc = probe->trigger; *tc; tc++) {
 340                                 trigger_mask[stage] |= probe_bit;
 341                                 if (*tc == '1')
 342                                         trigger_value[stage] |= probe_bit;
 343                                 stage++;
 344                                 if (stage > NUM_TRIGGER_STAGES)
 345                                         return SIGROK_ERR;
 346                         }
 347                 }
 348         }
 349
 350         if (stage == -1)
 351                 /*
 352                  * We didn't configure any triggers, make sure acquisition
 353                  * doesn't wait for any.
 354                  */
 355                 trigger_stage = TRIGGER_FIRED;
 356         else
 357                 trigger_stage = 0;
 358
 359         return SIGROK_OK;
 360 }
 361
 362 /*
 363  * API callbacks
 364  */
 365
 366 static int hw_init(char *deviceinfo)
 367 {
 368         struct sigrok_device_instance *sdi;
 369         struct libusb_device_descriptor des;
 370         libusb_device **devlist;
 371         int err, devcnt, i;
 372
 373         if (libusb_init(&usb_context) != 0) {
 374                 g_warning("Failed to initialize USB.");
 375                 return 0;
 376         }
 377         libusb_set_debug(usb_context, 3);
 378
 379         /* Find all Saleae Logic devices and upload firmware to all of them. */
 380         devcnt = 0;
 381         libusb_get_device_list(usb_context, &devlist);
 382         for (i = 0; devlist[i]; i++) {
 383                 err = libusb_get_device_descriptor(devlist[i], &des);
 384                 if (err != 0) {
 385                         g_warning("failed to get device descriptor: %d", err);
 386                         continue;
 387                 }
 388
 389                 if (des.idVendor == USB_VENDOR && des.idProduct == USB_PRODUCT) {
 390                         /* Definitely a Saleae Logic... */
 391
 392                         sdi = sigrok_device_instance_new(devcnt,
 393                                         ST_INITIALIZING, USB_VENDOR_NAME,
 394                                         USB_MODEL_NAME, USB_MODEL_VERSION);
 395                         if (!sdi)
 396                                 return 0;
 397                         device_instances =
 398                             g_slist_append(device_instances, sdi);
 399
 400                         if (check_conf_profile(devlist[i]) == 0) {
 401                                 if (upload_firmware(devlist[i]) > 0)
 402                                         /*
 403                                          * Continue on the off chance that the
 404                                          * device is in a working state.
 405                                          * TODO: Could maybe try a USB reset,
 406                                          * or uploading the firmware again.
 407                                          */
 408                                         g_warning("firmware upload failed for device %d", devcnt);
 409
 410                                 sdi->usb = usb_device_instance_new
 411                                   (libusb_get_bus_number(devlist[i]), 0, NULL);
 412                         } else {
 413                                 /*
 414                                  * Already has the firmware on it, so fix the
 415                                  * new address.
 416                                  */
 417                                 sdi->usb = usb_device_instance_new
 418                                     (libusb_get_bus_number(devlist[i]),
 419                                      libusb_get_device_address(devlist[i]),
 420                                      NULL);
 421                         }
 422                         devcnt++;
 423                 }
 424         }
 425         libusb_free_device_list(devlist, 1);
 426
 427         return devcnt;
 428 }
 429
 430 static int hw_opendev(int device_index)
 431 {
 432         GTimeVal cur_time;
 433         struct sigrok_device_instance *sdi;
 434         int timediff, err;
 435         unsigned int cur, upd;
 436
 437         if (firmware_updated.tv_sec > 0) {
 438                 /* Firmware was recently uploaded. */
 439                 g_get_current_time(&cur_time);
 440                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 441                 upd = firmware_updated.tv_sec * 1000 +
 442                       firmware_updated.tv_usec / 1000;
 443                 timediff = cur - upd;
 444                 if (timediff < FIRMWARE_RENUM_DELAY) {
 445                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 446                         g_message("waiting %d ms for device to reset",
 447                                   timediff);
 448                         g_usleep(timediff * 1000);
 449                         firmware_updated.tv_sec = 0;
 450                 }
 451         }
 452
 453         if (!(sdi = sl_open_device(device_index))) {
 454                 g_warning("unable to open device");
 455                 return SIGROK_ERR;
 456         }
 457
 458         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 459         if (err != 0) {
 460                 g_warning("Unable to claim interface: %d", err);
 461                 return SIGROK_ERR;
 462         }
 463
 464         if (cur_samplerate == 0) {
 465                 /* Samplerate hasn't been set; default to the slowest one. */
 466                 if (hw_set_configuration(device_index, HWCAP_SAMPLERATE,
 467                      &supported_samplerates[0]) == SIGROK_ERR)
 468                         return SIGROK_ERR;
 469         }
 470
 471         return SIGROK_OK;
 472 }
 473
 474 static void hw_closedev(int device_index)
 475 {
 476         struct sigrok_device_instance *sdi;
 477
 478         if ((sdi = get_sigrok_device_instance(device_instances, device_index)))
 479                 close_device(sdi);
 480 }
 481
 482 static void hw_cleanup(void)
 483 {
 484         GSList *l;
 485
 486         /* Properly close all devices... */
 487         for (l = device_instances; l; l = l->next)
 488                 close_device((struct sigrok_device_instance *)l->data);
 489
 490         /* ...and free all their memory. */
 491         for (l = device_instances; l; l = l->next)
 492                 g_free(l->data);
 493         g_slist_free(device_instances);
 494         device_instances = NULL;
 495
 496         if (usb_context)
 497                 libusb_exit(usb_context);
 498         usb_context = NULL;
 499 }
 500
 501 static void *hw_get_device_info(int device_index, int device_info_id)
 502 {
 503         struct sigrok_device_instance *sdi;
 504         void *info = NULL;
 505
 506         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 507                 return NULL;
 508
 509         switch (device_info_id) {
 510         case DI_INSTANCE:
 511                 info = sdi;
 512                 break;
 513         case DI_NUM_PROBES:
 514                 info = GINT_TO_POINTER(NUM_PROBES);
 515                 break;
 516         case DI_SAMPLERATES:
 517                 info = &samplerates;
 518                 break;
 519         case DI_TRIGGER_TYPES:
 520                 info = TRIGGER_TYPES;
 521                 break;
 522         case DI_CUR_SAMPLERATE:
 523                 info = &cur_samplerate;
 524                 break;
 525         }
 526
 527         return info;
 528 }
 529
 530 static int hw_get_status(int device_index)
 531 {
 532         struct sigrok_device_instance *sdi;
 533
 534         sdi = get_sigrok_device_instance(device_instances, device_index);
 535         if (sdi)
 536                 return sdi->status;
 537         else
 538                 return ST_NOT_FOUND;
 539 }
 540
 541 static int *hw_get_capabilities(void)
 542 {
 543         return capabilities;
 544 }
 545
 546 static int set_configuration_samplerate(struct sigrok_device_instance *sdi,
 547                                         uint64_t samplerate)
 548 {
 549         uint8_t divider;
 550         int ret, result, i;
 551         unsigned char buf[2];
 552
 553         for (i = 0; supported_samplerates[i]; i++) {
 554                 if (supported_samplerates[i] == samplerate)
 555                         break;
 556         }
 557         if (supported_samplerates[i] == 0)
 558                 return SIGROK_ERR_SAMPLERATE;
 559
 560         divider = (uint8_t) (48 / (float)(samplerate / 1000000)) - 1;
 561
 562         g_message("setting samplerate to %" PRIu64 " Hz (divider %d)",
 563                   samplerate, divider);
 564         buf[0] = 0x01;
 565         buf[1] = divider;
 566         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 567                                    buf, 2, &result, 500);
 568         if (ret != 0) {
 569                 g_warning("failed to set samplerate: %d", ret);
 570                 return SIGROK_ERR;
 571         }
 572         cur_samplerate = samplerate;
 573
 574         return SIGROK_OK;
 575 }
 576
 577 static int hw_set_configuration(int device_index, int capability, void *value)
 578 {
 579         struct sigrok_device_instance *sdi;
 580         int ret;
 581         uint64_t *tmp_u64;
 582
 583         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 584                 return SIGROK_ERR;
 585
 586         if (capability == HWCAP_SAMPLERATE) {
 587                 tmp_u64 = value;
 588                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 589         } else if (capability == HWCAP_PROBECONFIG) {
 590                 ret = configure_probes((GSList *) value);
 591         } else if (capability == HWCAP_LIMIT_SAMPLES) {
 592                 limit_samples = strtoull(value, NULL, 10);
 593                 ret = SIGROK_OK;
 594         } else {
 595                 ret = SIGROK_ERR;
 596         }
 597
 598         return ret;
 599 }
 600
 601 static int receive_data(int fd, int revents, void *user_data)
 602 {
 603         struct timeval tv;
 604
 605         tv.tv_sec = tv.tv_usec = 0;
 606         libusb_handle_events_timeout(usb_context, &tv);
 607
 608         return TRUE;
 609 }
 610
 611 void receive_transfer(struct libusb_transfer *transfer)
 612 {
 613         static int num_samples = 0;
 614         static int empty_transfer_count = 0;
 615         struct datafeed_packet packet;
 616         void *user_data;
 617         int cur_buflen, trigger_offset, i;
 618         unsigned char *cur_buf, *new_buf;
 619
 620         if (transfer == NULL) {
 621                 /* hw_stop_acquisition() is telling us to stop. */
 622                 num_samples = -1;
 623         }
 624
 625         if (num_samples == -1) {
 626                 /*
 627                  * Acquisition has already ended, just free any queued up
 628                  * transfer that come in.
 629                  */
 630                 libusb_free_transfer(transfer);
 631         } else {
 632                 g_message("receive_transfer(): status %d received %d bytes",
 633                           transfer->status, transfer->actual_length);
 634
 635                 /* Save incoming transfer before reusing the transfer struct. */
 636                 cur_buf = transfer->buffer;
 637                 cur_buflen = transfer->actual_length;
 638                 user_data = transfer->user_data;
 639
 640                 /* Fire off a new request. */
 641                 new_buf = g_malloc(4096);
 642                 transfer->buffer = new_buf;
 643                 transfer->length = 4096;
 644                 if (libusb_submit_transfer(transfer) != 0) {
 645                         /* TODO: Stop session? */
 646                         g_warning("eek");
 647                 }
 648
 649                 if (cur_buflen == 0) {
 650                         empty_transfer_count++;
 651                         if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 652                                 /* The FX2 gave up. End the acquisition, the
 653                                  * frontend will work out that the samplecount
 654                                  * is short.
 655                                  */
 656                                 packet.type = DF_END;
 657                                 session_bus(user_data, &packet);
 658                                 num_samples = -1;
 659                         }
 660                         return;
 661                 } else {
 662                         empty_transfer_count = 0;
 663                 }
 664
 665                 trigger_offset = 0;
 666                 if (trigger_stage >= 0) {
 667                         for (i = 0; i < cur_buflen; i++) {
 668                                 if ((cur_buf[i] & trigger_mask[trigger_stage])
 669                                     == trigger_value[trigger_stage]) {
 670                                         /* Match on this trigger stage. */
 671                                         trigger_buffer[trigger_stage] =
 672                                             cur_buf[i];
 673                                         trigger_stage++;
 674                                         if (trigger_stage == NUM_TRIGGER_STAGES
 675                                             || trigger_mask[trigger_stage] == 0) {
 676                                                 /* Match on all trigger stages, we're done */
 677                                                 trigger_offset = i + 1;
 678
 679                                                 /* TODO: Send pre-trigger buffer to session bus. Tell the frontend we hit the trigger here. */
 680                                                 packet.type = DF_TRIGGER;
 681                                                 packet.length = 0;
 682                                                 session_bus(user_data, &packet);
 683
 684                                                 /* Send the samples that triggered it, since we're skipping past them. */
 685                                                 packet.type = DF_LOGIC8;
 686                                                 packet.length = trigger_stage;
 687                                                 packet.payload = trigger_buffer;
 688                                                 session_bus(user_data, &packet);
 689                                                 break;
 690
 691                                                 trigger_stage = TRIGGER_FIRED;
 692                                         }
 693                                 } else if (trigger_stage > 0) {
 694                                         /*
 695                                          * We had a match before, but not in the next sample. However, we may
 696                                          * have a match on this stage in the next bit -- trigger on 0001 will
 697                                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 698                                          * the next sample from the one that matched originally, which the
 699                                          * counter increment at the end of the loop takes care of.
 700                                          */
 701                                         i -= trigger_stage;
 702                                         if (i < -1)
 703                                                 /* Oops, went back past this buffer. */
 704                                                 i = -1;
 705                                         /* Reset trigger stage. */
 706                                         trigger_stage = 0;
 707                                 }
 708                         }
 709                 }
 710
 711                 if (trigger_stage == TRIGGER_FIRED) {
 712                         /* Send the incoming transfer to the session bus. */
 713                         packet.type = DF_LOGIC8;
 714                         packet.length = cur_buflen - trigger_offset;
 715                         packet.payload = cur_buf + trigger_offset;
 716                         session_bus(user_data, &packet);
 717                         g_free(cur_buf);
 718
 719                         num_samples += cur_buflen;
 720                         if (num_samples > limit_samples) {
 721                                 /* End the acquisition. */
 722                                 packet.type = DF_END;
 723                                 session_bus(user_data, &packet);
 724                                 num_samples = -1;
 725                         }
 726                 } else {
 727                         /*
 728                          * TODO: Buffer pre-trigger data in capture
 729                          * ratio-sized buffer.
 730                          */
 731                 }
 732         }
 733 }
 734
 735 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 736 {
 737         struct sigrok_device_instance *sdi;
 738         struct datafeed_packet *packet;
 739         struct datafeed_header *header;
 740         struct libusb_transfer *transfer;
 741         const struct libusb_pollfd **lupfd;
 742         int size, i;
 743         unsigned char *buf;
 744
 745         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 746                 return SIGROK_ERR;
 747
 748         packet = g_malloc(sizeof(struct datafeed_packet));
 749         header = g_malloc(sizeof(struct datafeed_header));
 750         if (!packet || !header)
 751                 return SIGROK_ERR;
 752
 753         /* Start with 2K transfer, subsequently increased to 4K. */
 754         size = 2048;
 755         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 756                 buf = g_malloc(size);
 757                 transfer = libusb_alloc_transfer(0);
 758                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 759                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 760                                 receive_transfer, session_device_id, 40);
 761                 if (libusb_submit_transfer(transfer) != 0) {
 762                         /* TODO: Free them all. */
 763                         libusb_free_transfer(transfer);
 764                         g_free(buf);
 765                         return SIGROK_ERR;
 766                 }
 767                 size = 4096;
 768         }
 769
 770         lupfd = libusb_get_pollfds(usb_context);
 771         for (i = 0; lupfd[i]; i++)
 772                 source_add(lupfd[i]->fd, lupfd[i]->events, -1, receive_data,
 773                            NULL);
 774         free(lupfd);
 775
 776         packet->type = DF_HEADER;
 777         packet->length = sizeof(struct datafeed_header);
 778         packet->payload = (unsigned char *)header;
 779         header->feed_version = 1;
 780         gettimeofday(&header->starttime, NULL);
 781         header->samplerate = cur_samplerate;
 782         header->protocol_id = PROTO_RAW;
 783         header->num_probes = NUM_PROBES;
 784         session_bus(session_device_id, packet);
 785         g_free(header);
 786         g_free(packet);
 787
 788         return SIGROK_OK;
 789 }
 790
 791 /* This stops acquisition on ALL devices, ignoring device_index. */
 792 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 793 {
 794         struct datafeed_packet packet;
 795
 796         packet.type = DF_END;
 797         session_bus(session_device_id, &packet);
 798
 799         receive_transfer(NULL);
 800
 801         /* TODO: Need to cancel and free any queued up transfers. */
 802 }
 803
 804 struct device_plugin saleae_logic_plugin_info = {
 805         "saleae-logic",
 806         1,
 807         hw_init,
 808         hw_cleanup,
 809
 810         hw_opendev,
 811         hw_closedev,
 812         hw_get_device_info,
 813         hw_get_status,
 814         hw_get_capabilities,
 815         hw_set_configuration,
 816         hw_start_acquisition,
 817         hw_stop_acquisition,
 818 };