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 static int opendev2(int device_index, struct sigrok_device_instance **sdi,
 168                     libusb_device *dev, struct libusb_device_descriptor *des,
 169                     int *skip, uint16_t vid, uint16_t pid, int interface)
 170 {
 171         int err;
 172
 173         if ((err = libusb_get_device_descriptor(dev, des))) {
 174                 g_warning("failed to get device descriptor: %d", err);
 175                 return -1;
 176         }
 177
 178         if (des->idVendor != vid || des->idProduct != pid)
 179                 return 0;
 180
 181         if (*skip != device_index) {
 182                 /* Skip devices of this type that aren't the one we want. */
 183                 *skip += 1;
 184                 return 0;
 185         }
 186
 187         /*
 188          * Should check the bus here, since we know that already. But what are
 189          * we going to do if it doesn't match after the right number of skips?
 190          */
 191         if (!(err = libusb_open(dev, &((*sdi)->usb->devhdl)))) {
 192                 (*sdi)->usb->address = libusb_get_device_address(dev);
 193                 (*sdi)->status = ST_ACTIVE;
 194                 g_message("opened device %d on %d.%d interface %d",
 195                           (*sdi)->index, (*sdi)->usb->bus,
 196                           (*sdi)->usb->address, interface);
 197         } else {
 198                 g_warning("failed to open device: %d", err);
 199                 *sdi = NULL;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int opendev3(struct sigrok_device_instance **sdi, libusb_device *dev,
 206                     struct libusb_device_descriptor *des,
 207                     uint16_t vid, uint16_t pid, int interface)
 208 {
 209         int err;
 210
 211         if ((err = libusb_get_device_descriptor(dev, des))) {
 212                 g_warning("failed to get device descriptor: %d", err);
 213                 return -1;
 214         }
 215
 216         if (des->idVendor != vid || des->idProduct != pid)
 217                 return 0;
 218
 219         if (libusb_get_bus_number(dev) == (*sdi)->usb->bus
 220             && libusb_get_device_address(dev) == (*sdi)->usb->address) {
 221                 /* Found it. */
 222                 if (!(err = libusb_open(dev, &((*sdi)->usb->devhdl)))) {
 223                         (*sdi)->status = ST_ACTIVE;
 224                         g_message("opened device %d on %d.%d interface %d",
 225                                   (*sdi)->index, (*sdi)->usb->bus,
 226                                   (*sdi)->usb->address, interface);
 227                 } else {
 228                         g_warning("failed to open device: %d", err);
 229                         *sdi = NULL;
 230                 }
 231         }
 232
 233         return 0;
 234 }
 235
 236 struct sigrok_device_instance *sl_open_device(int device_index)
 237 {
 238         struct sigrok_device_instance *sdi;
 239         libusb_device **devlist;
 240         struct libusb_device_descriptor des;
 241         int err, skip, i;
 242
 243         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 244                 return NULL;
 245
 246         libusb_get_device_list(usb_context, &devlist);
 247         if (sdi->status == ST_INITIALIZING) {
 248                 /*
 249                  * This device was renumerating last time we touched it.
 250                  * opendev() guarantees we've waited long enough for it to
 251                  * have booted properly, so now we need to find it on
 252                  * the bus and record its new address.
 253                  */
 254                 skip = 0;
 255                 for (i = 0; devlist[i]; i++) {
 256                         /* TODO: Error handling. */
 257                         err = opendev2(device_index, &sdi, devlist[i], &des,
 258                                        &skip, USB_VENDOR, USB_PRODUCT,
 259                                        USB_INTERFACE);
 260                 }
 261         } else if (sdi->status == ST_INACTIVE) {
 262                 /*
 263                  * This device is fully enumerated, so we need to find this
 264                  * device by vendor, product, bus and address.
 265                  */
 266                 libusb_get_device_list(usb_context, &devlist);
 267                 for (i = 0; devlist[i]; i++) {
 268                         /* TODO: Error handling. */
 269                         err = opendev3(&sdi, devlist[i], &des, USB_VENDOR,
 270                                        USB_PRODUCT, USB_INTERFACE);
 271                 }
 272         } else {
 273                 /* Status must be ST_ACTIVE, i.e. already in use... */
 274                 sdi = NULL;
 275         }
 276         libusb_free_device_list(devlist, 1);
 277
 278         if (sdi && sdi->status != ST_ACTIVE)
 279                 sdi = NULL;
 280
 281         return sdi;
 282 }
 283
 284 int upload_firmware(libusb_device *dev)
 285 {
 286         int ret;
 287
 288         ret = ezusb_upload_firmware(dev, USB_CONFIGURATION, FIRMWARE);
 289         if (ret != 0)
 290                 return 1;
 291
 292         /* Remember when the last firmware update was done. */
 293         g_get_current_time(&firmware_updated);
 294
 295         return 0;
 296 }
 297
 298 static void close_device(struct sigrok_device_instance *sdi)
 299 {
 300         if (sdi->usb->devhdl == NULL)
 301                 return;
 302
 303         g_message("closing device %d on %d.%d interface %d", sdi->index,
 304                   sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 305         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 306         libusb_close(sdi->usb->devhdl);
 307         sdi->usb->devhdl = NULL;
 308         sdi->status = ST_INACTIVE;
 309 }
 310
 311 static int configure_probes(GSList *probes)
 312 {
 313         struct probe *probe;
 314         GSList *l;
 315         int probe_bit, stage, i;
 316         char *tc;
 317
 318         probe_mask = 0;
 319         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 320                 trigger_mask[i] = 0;
 321                 trigger_value[i] = 0;
 322         }
 323
 324         stage = -1;
 325         for (l = probes; l; l = l->next) {
 326                 probe = (struct probe *)l->data;
 327                 if (probe->enabled == FALSE)
 328                         continue;
 329                 probe_bit = 1 << (probe->index - 1);
 330                 probe_mask |= probe_bit;
 331                 if (probe->trigger) {
 332                         stage = 0;
 333                         for (tc = probe->trigger; *tc; tc++) {
 334                                 trigger_mask[stage] |= probe_bit;
 335                                 if (*tc == '1')
 336                                         trigger_value[stage] |= probe_bit;
 337                                 stage++;
 338                                 if (stage > NUM_TRIGGER_STAGES)
 339                                         return SIGROK_ERR;
 340                         }
 341                 }
 342         }
 343
 344         if (stage == -1)
 345                 /*
 346                  * We didn't configure any triggers, make sure acquisition
 347                  * doesn't wait for any.
 348                  */
 349                 trigger_stage = TRIGGER_FIRED;
 350         else
 351                 trigger_stage = 0;
 352
 353         return SIGROK_OK;
 354 }
 355
 356 /*
 357  * API callbacks
 358  */
 359
 360 static int hw_init(char *deviceinfo)
 361 {
 362         struct sigrok_device_instance *sdi;
 363         struct libusb_device_descriptor des;
 364         libusb_device **devlist;
 365         int err, devcnt, i;
 366
 367         /* QUICK HACK */
 368         deviceinfo = deviceinfo;
 369
 370         if (libusb_init(&usb_context) != 0) {
 371                 g_warning("Failed to initialize USB.");
 372                 return 0;
 373         }
 374         libusb_set_debug(usb_context, 3);
 375
 376         /* Find all Saleae Logic devices and upload firmware to all of them. */
 377         devcnt = 0;
 378         libusb_get_device_list(usb_context, &devlist);
 379         for (i = 0; devlist[i]; i++) {
 380                 err = libusb_get_device_descriptor(devlist[i], &des);
 381                 if (err != 0) {
 382                         g_warning("failed to get device descriptor: %d", err);
 383                         continue;
 384                 }
 385
 386                 if (des.idVendor != USB_VENDOR || des.idProduct != USB_PRODUCT)
 387                         continue; /* Not a Saleae Logic... */
 388
 389                 sdi = sigrok_device_instance_new(devcnt, ST_INITIALIZING,
 390                         USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
 391                 if (!sdi)
 392                         return 0;
 393                 device_instances = g_slist_append(device_instances, sdi);
 394
 395                 if (check_conf_profile(devlist[i]) == 0) {
 396                         /*
 397                          * Continue on the off chance that the device is in a
 398                          * working state. TODO: Could maybe try a USB reset,
 399                          * or uploading the firmware again.
 400                          */
 401                         if (upload_firmware(devlist[i]) > 0)
 402                                 g_warning("firmware upload failed for "
 403                                           "device %d", devcnt);
 404
 405                         sdi->usb = usb_device_instance_new
 406                                 (libusb_get_bus_number(devlist[i]), 0, NULL);
 407                 } else {
 408                         /* Already has the firmware, so fix the new address. */
 409                         sdi->usb = usb_device_instance_new
 410                             (libusb_get_bus_number(devlist[i]),
 411                              libusb_get_device_address(devlist[i]), NULL);
 412                 }
 413                 devcnt++;
 414         }
 415         libusb_free_device_list(devlist, 1);
 416
 417         return devcnt;
 418 }
 419
 420 static int hw_opendev(int device_index)
 421 {
 422         GTimeVal cur_time;
 423         struct sigrok_device_instance *sdi;
 424         int timediff, err;
 425         unsigned int cur, upd;
 426
 427         if (firmware_updated.tv_sec > 0) {
 428                 /* Firmware was recently uploaded. */
 429                 g_get_current_time(&cur_time);
 430                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 431                 upd = firmware_updated.tv_sec * 1000 +
 432                       firmware_updated.tv_usec / 1000;
 433                 timediff = cur - upd;
 434                 if (timediff < FIRMWARE_RENUM_DELAY) {
 435                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 436                         g_message("waiting %d ms for device to reset",
 437                                   timediff);
 438                         g_usleep(timediff * 1000);
 439                         firmware_updated.tv_sec = 0;
 440                 }
 441         }
 442
 443         if (!(sdi = sl_open_device(device_index))) {
 444                 g_warning("unable to open device");
 445                 return SIGROK_ERR;
 446         }
 447
 448         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 449         if (err != 0) {
 450                 g_warning("Unable to claim interface: %d", err);
 451                 return SIGROK_ERR;
 452         }
 453
 454         if (cur_samplerate == 0) {
 455                 /* Samplerate hasn't been set; default to the slowest one. */
 456                 if (hw_set_configuration(device_index, HWCAP_SAMPLERATE,
 457                     &supported_samplerates[0]) == SIGROK_ERR)
 458                         return SIGROK_ERR;
 459         }
 460
 461         return SIGROK_OK;
 462 }
 463
 464 static void hw_closedev(int device_index)
 465 {
 466         struct sigrok_device_instance *sdi;
 467
 468         if ((sdi = get_sigrok_device_instance(device_instances, device_index)))
 469                 close_device(sdi);
 470 }
 471
 472 static void hw_cleanup(void)
 473 {
 474         GSList *l;
 475
 476         /* Properly close all devices... */
 477         for (l = device_instances; l; l = l->next)
 478                 close_device((struct sigrok_device_instance *)l->data);
 479
 480         /* ...and free all their memory. */
 481         for (l = device_instances; l; l = l->next)
 482                 g_free(l->data);
 483         g_slist_free(device_instances);
 484         device_instances = NULL;
 485
 486         if (usb_context)
 487                 libusb_exit(usb_context);
 488         usb_context = NULL;
 489 }
 490
 491 static void *hw_get_device_info(int device_index, int device_info_id)
 492 {
 493         struct sigrok_device_instance *sdi;
 494         void *info = NULL;
 495
 496         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 497                 return NULL;
 498
 499         switch (device_info_id) {
 500         case DI_INSTANCE:
 501                 info = sdi;
 502                 break;
 503         case DI_NUM_PROBES:
 504                 info = GINT_TO_POINTER(NUM_PROBES);
 505                 break;
 506         case DI_SAMPLERATES:
 507                 info = &samplerates;
 508                 break;
 509         case DI_TRIGGER_TYPES:
 510                 info = TRIGGER_TYPES;
 511                 break;
 512         case DI_CUR_SAMPLERATE:
 513                 info = &cur_samplerate;
 514                 break;
 515         }
 516
 517         return info;
 518 }
 519
 520 static int hw_get_status(int device_index)
 521 {
 522         struct sigrok_device_instance *sdi;
 523
 524         sdi = get_sigrok_device_instance(device_instances, device_index);
 525         if (sdi)
 526                 return sdi->status;
 527         else
 528                 return ST_NOT_FOUND;
 529 }
 530
 531 static int *hw_get_capabilities(void)
 532 {
 533         return capabilities;
 534 }
 535
 536 static int set_configuration_samplerate(struct sigrok_device_instance *sdi,
 537                                         uint64_t samplerate)
 538 {
 539         uint8_t divider;
 540         int ret, result, i;
 541         unsigned char buf[2];
 542
 543         for (i = 0; supported_samplerates[i]; i++) {
 544                 if (supported_samplerates[i] == samplerate)
 545                         break;
 546         }
 547         if (supported_samplerates[i] == 0)
 548                 return SIGROK_ERR_SAMPLERATE;
 549
 550         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 551
 552         g_message("setting samplerate to %" PRIu64 " Hz (divider %d)",
 553                   samplerate, divider);
 554         buf[0] = 0x01;
 555         buf[1] = divider;
 556         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 557                                    buf, 2, &result, 500);
 558         if (ret != 0) {
 559                 g_warning("failed to set samplerate: %d", ret);
 560                 return SIGROK_ERR;
 561         }
 562         cur_samplerate = samplerate;
 563
 564         return SIGROK_OK;
 565 }
 566
 567 static int hw_set_configuration(int device_index, int capability, void *value)
 568 {
 569         struct sigrok_device_instance *sdi;
 570         int ret;
 571         uint64_t *tmp_u64;
 572
 573         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 574                 return SIGROK_ERR;
 575
 576         if (capability == HWCAP_SAMPLERATE) {
 577                 tmp_u64 = value;
 578                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 579         } else if (capability == HWCAP_PROBECONFIG) {
 580                 ret = configure_probes((GSList *) value);
 581         } else if (capability == HWCAP_LIMIT_SAMPLES) {
 582                 limit_samples = strtoull(value, NULL, 10);
 583                 ret = SIGROK_OK;
 584         } else {
 585                 ret = SIGROK_ERR;
 586         }
 587
 588         return ret;
 589 }
 590
 591 static int receive_data(int fd, int revents, void *user_data)
 592 {
 593         struct timeval tv;
 594
 595         /* QUICK HACK */
 596         fd = fd;
 597         revents = revents;
 598         user_data = user_data;
 599
 600         tv.tv_sec = tv.tv_usec = 0;
 601         libusb_handle_events_timeout(usb_context, &tv);
 602
 603         return TRUE;
 604 }
 605
 606 static void trigger_helper(int i, unsigned char *cur_buf,
 607                            struct datafeed_packet *packet, void *user_data,
 608                            int *trigger_offset)
 609 {
 610         if ((cur_buf[i] & trigger_mask[trigger_stage])
 611             == trigger_value[trigger_stage]) {
 612                 /* Match on this trigger stage. */
 613                 trigger_buffer[trigger_stage] = cur_buf[i];
 614                 trigger_stage++;
 615                 if (trigger_stage == NUM_TRIGGER_STAGES
 616                     || trigger_mask[trigger_stage] == 0) {
 617                         /* Match on all trigger stages, we're done. */
 618                         *trigger_offset = i + 1;
 619
 620                         /*
 621                          * TODO: Send pre-trigger buffer to session bus.
 622                          * Tell the frontend we hit the trigger here.
 623                          */
 624                         packet->type = DF_TRIGGER;
 625                         packet->length = 0;
 626                         session_bus(user_data, packet);
 627
 628                         /*
 629                          * Send the samples that triggered it, since we're
 630                          * skipping past them.
 631                          */
 632                         packet->type = DF_LOGIC8;
 633                         packet->length = trigger_stage;
 634                         packet->payload = trigger_buffer;
 635                         session_bus(user_data, packet);
 636                         // break; // FIXME???
 637
 638                         trigger_stage = TRIGGER_FIRED;
 639                 }
 640                 return;
 641         }
 642
 643         /*
 644          * We had a match before, but not in the next sample. However, we may
 645          * have a match on this stage in the next bit -- trigger on 0001 will
 646          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 647          * the next sample from the one that matched originally, which the
 648          * counter increment at the end of the loop takes care of.
 649          */
 650         if (trigger_stage > 0) {
 651                 i -= trigger_stage;
 652                 if (i < -1)
 653                         i = -1; /* Oops, went back past this buffer. */
 654                 /* Reset trigger stage. */
 655                 trigger_stage = 0;
 656         }
 657 }
 658
 659 void receive_transfer(struct libusb_transfer *transfer)
 660 {
 661         static int num_samples = 0;
 662         static int empty_transfer_count = 0;
 663         struct datafeed_packet packet;
 664         void *user_data;
 665         int cur_buflen, trigger_offset, i;
 666         unsigned char *cur_buf, *new_buf;
 667
 668         /* hw_stop_acquisition() is telling us to stop. */
 669         if (transfer == NULL)
 670                 num_samples = -1;
 671
 672         /*
 673          * If acquisition has already ended, just free any queued up
 674          * transfer that come in.
 675          */
 676         if (num_samples == -1) {
 677                 if (transfer)
 678                         libusb_free_transfer(transfer);
 679                 return;
 680         }
 681
 682         g_message("receive_transfer(): status %d received %d bytes",
 683                   transfer->status, transfer->actual_length);
 684
 685         /* Save incoming transfer before reusing the transfer struct. */
 686         cur_buf = transfer->buffer;
 687         cur_buflen = transfer->actual_length;
 688         user_data = transfer->user_data;
 689
 690         /* Fire off a new request. */
 691         new_buf = g_malloc(4096);
 692         transfer->buffer = new_buf;
 693         transfer->length = 4096;
 694         if (libusb_submit_transfer(transfer) != 0) {
 695                 /* TODO: Stop session? */
 696                 g_warning("eek");
 697         }
 698
 699         if (cur_buflen == 0) {
 700                 empty_transfer_count++;
 701                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 702                         /*
 703                          * The FX2 gave up. End the acquisition, the frontend
 704                          * will work out that the samplecount is short.
 705                          */
 706                         hw_stop_acquisition(-1, user_data);
 707                 }
 708                 return;
 709         } else {
 710                 empty_transfer_count = 0;
 711         }
 712
 713         trigger_offset = 0;
 714         if (trigger_stage >= 0) {
 715                 for (i = 0; i < cur_buflen; i++) {
 716                         trigger_helper(i, cur_buf, &packet, user_data,
 717                                        &trigger_offset);
 718                 }
 719         }
 720
 721         if (trigger_stage == TRIGGER_FIRED) {
 722                 /* Send the incoming transfer to the session bus. */
 723                 packet.type = DF_LOGIC8;
 724                 packet.length = cur_buflen - trigger_offset;
 725                 packet.payload = cur_buf + trigger_offset;
 726                 session_bus(user_data, &packet);
 727                 g_free(cur_buf);
 728
 729                 num_samples += cur_buflen;
 730                 if ((unsigned int)num_samples > limit_samples) {
 731                         hw_stop_acquisition(-1, user_data);
 732                 }
 733         } else {
 734                 /*
 735                  * TODO: Buffer pre-trigger data in capture
 736                  * ratio-sized buffer.
 737                  */
 738         }
 739 }
 740
 741 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 742 {
 743         struct sigrok_device_instance *sdi;
 744         struct datafeed_packet *packet;
 745         struct datafeed_header *header;
 746         struct libusb_transfer *transfer;
 747         const struct libusb_pollfd **lupfd;
 748         int size, i;
 749         unsigned char *buf;
 750
 751         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 752                 return SIGROK_ERR;
 753
 754         packet = g_malloc(sizeof(struct datafeed_packet));
 755         header = g_malloc(sizeof(struct datafeed_header));
 756         if (!packet || !header)
 757                 return SIGROK_ERR;
 758
 759         /* Start with 2K transfer, subsequently increased to 4K. */
 760         size = 2048;
 761         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 762                 buf = g_malloc(size);
 763                 transfer = libusb_alloc_transfer(0);
 764                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 765                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 766                                 receive_transfer, session_device_id, 40);
 767                 if (libusb_submit_transfer(transfer) != 0) {
 768                         /* TODO: Free them all. */
 769                         libusb_free_transfer(transfer);
 770                         g_free(buf);
 771                         return SIGROK_ERR;
 772                 }
 773                 size = 4096;
 774         }
 775
 776         lupfd = libusb_get_pollfds(usb_context);
 777         for (i = 0; lupfd[i]; i++)
 778                 source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 779                            NULL);
 780         free(lupfd);
 781
 782         packet->type = DF_HEADER;
 783         packet->length = sizeof(struct datafeed_header);
 784         packet->payload = (unsigned char *)header;
 785         header->feed_version = 1;
 786         gettimeofday(&header->starttime, NULL);
 787         header->samplerate = cur_samplerate;
 788         header->protocol_id = PROTO_RAW;
 789         header->num_probes = NUM_PROBES;
 790         session_bus(session_device_id, packet);
 791         g_free(header);
 792         g_free(packet);
 793
 794         return SIGROK_OK;
 795 }
 796
 797 /* This stops acquisition on ALL devices, ignoring device_index. */
 798 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 799 {
 800         struct datafeed_packet packet;
 801
 802         /* QUICK HACK */
 803         device_index = device_index;
 804
 805         packet.type = DF_END;
 806         session_bus(session_device_id, &packet);
 807
 808         receive_transfer(NULL);
 809
 810         /* TODO: Need to cancel and free any queued up transfers. */
 811 }
 812
 813 struct device_plugin saleae_logic_plugin_info = {
 814         "saleae-logic",
 815         1,
 816         hw_init,
 817         hw_cleanup,
 818
 819         hw_opendev,
 820         hw_closedev,
 821         hw_get_device_info,
 822         hw_get_status,
 823         hw_get_capabilities,
 824         hw_set_configuration,
 825         hw_start_acquisition,
 826         hw_stop_acquisition,
 827 };