hardware/fx2lafw/fx2lafw.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   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 <inttypes.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include "config.h"
  26 #include "sigrok.h"
  27 #include "sigrok-internal.h"
  28 #include "fx2lafw.h"
  29 #include "command.h"
  30
  31 static const struct fx2lafw_profile supported_fx2[] = {
  32         /*
  33          * CWAV USBee AX
  34          * EE Electronics ESLA201A
  35          */
  36         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  37                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  38
  39         /*
  40          * CWAV USBee SX
  41          */
  42         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  43                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  44
  45         /*
  46          * Saleae Logic
  47          * EE Electronics ESLA100
  48          * Robomotic MiniLogic
  49          */
  50         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  51                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  52
  53         { 0, 0, 0, 0, 0, 0, 0 }
  54 };
  55
  56 static int hwcaps[] = {
  57         SR_HWCAP_LOGIC_ANALYZER,
  58         SR_HWCAP_SAMPLERATE,
  59
  60         /* These are really implemented in the driver, not the hardware. */
  61         SR_HWCAP_LIMIT_SAMPLES,
  62         SR_HWCAP_CONTINUOUS,
  63         0,
  64 };
  65
  66 /*
  67  * TODO: Different probe_names[] for each supported device.
  68  */
  69 static const char *probe_names[] = {
  70         "0",
  71         "1",
  72         "2",
  73         "3",
  74         "4",
  75         "5",
  76         "6",
  77         "7",
  78         NULL,
  79 };
  80
  81 static uint64_t supported_samplerates[] = {
  82         SR_KHZ(200),
  83         SR_KHZ(250),
  84         SR_KHZ(500),
  85         SR_MHZ(1),
  86         SR_MHZ(2),
  87         SR_MHZ(3),
  88         SR_MHZ(4),
  89         SR_MHZ(6),
  90         SR_MHZ(8),
  91         SR_MHZ(12),
  92         SR_MHZ(16),
  93         SR_MHZ(24),
  94 };
  95
  96 static struct sr_samplerates samplerates = {
  97         0,
  98         0,
  99         0,
 100         supported_samplerates,
 101 };
 102
 103 static GSList *dev_insts = NULL;
 104 static libusb_context *usb_context = NULL;
 105
 106 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 107 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 108
 109 /**
 110  * Check the USB configuration to determine if this is an fx2lafw device.
 111  *
 112  * @return TRUE if the device's configuration profile match fx2lafw
 113  *         configuration, FALSE otherwise.
 114  */
 115 static gboolean check_conf_profile(libusb_device *dev)
 116 {
 117         struct libusb_device_descriptor des;
 118         struct libusb_config_descriptor *conf_dsc = NULL;
 119         const struct libusb_interface_descriptor *intf_dsc;
 120         gboolean ret = FALSE;
 121
 122         while (!ret) {
 123                 /* Assume the FW has not been loaded, unless proven wrong. */
 124                 ret = FALSE;
 125
 126                 if (libusb_get_device_descriptor(dev, &des) != 0)
 127                         break;
 128
 129                 /* Need exactly 1 configuration. */
 130                 if (des.bNumConfigurations != 1)
 131                         break;
 132
 133                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 134                         break;
 135
 136                 /* Need exactly 1 interface. */
 137                 if (conf_dsc->bNumInterfaces != 1)
 138                         break;
 139
 140                 /* Need just one alternate setting. */
 141                 if (conf_dsc->interface[0].num_altsetting != 1)
 142                         break;
 143
 144                 /* Need exactly 2 endpoints. */
 145                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 146                 if (intf_dsc->bNumEndpoints != 2)
 147                         break;
 148
 149                 /* The first endpoint should be 2 (inbound). */
 150                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 151                     (2 | LIBUSB_ENDPOINT_IN))
 152                         break;
 153
 154                 /* If we made it here, it must be an fx2lafw. */
 155                 ret = TRUE;
 156         }
 157
 158         if (conf_dsc)
 159                 libusb_free_config_descriptor(conf_dsc);
 160
 161         return ret;
 162 }
 163
 164 static int fx2lafw_dev_open(int dev_index)
 165 {
 166         libusb_device **devlist;
 167         struct libusb_device_descriptor des;
 168         struct sr_dev_inst *sdi;
 169         struct context *ctx;
 170         struct version_info vi;
 171         int ret, skip, i;
 172
 173         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 174                 return SR_ERR;
 175         ctx = sdi->priv;
 176
 177         if (sdi->status == SR_ST_ACTIVE)
 178                 /* already in use */
 179                 return SR_ERR;
 180
 181         skip = 0;
 182         const int device_count = libusb_get_device_list(usb_context, &devlist);
 183         if (device_count < 0) {
 184                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 185                         device_count);
 186                 return SR_ERR;
 187         }
 188
 189         for (i = 0; i < device_count; i++) {
 190                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 191                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 192                                ret);
 193                         continue;
 194                 }
 195
 196                 if (des.idVendor != ctx->profile->vid
 197                     || des.idProduct != ctx->profile->pid)
 198                         continue;
 199
 200                 if (sdi->status == SR_ST_INITIALIZING) {
 201                         if (skip != dev_index) {
 202                                 /* Skip devices of this type that aren't the one we want. */
 203                                 skip += 1;
 204                                 continue;
 205                         }
 206                 } else if (sdi->status == SR_ST_INACTIVE) {
 207                         /*
 208                          * This device is fully enumerated, so we need to find
 209                          * this device by vendor, product, bus and address.
 210                          */
 211                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 212                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 213                                 /* this is not the one */
 214                                 continue;
 215                 }
 216
 217                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 218                         if (ctx->usb->address == 0xff)
 219                                 /*
 220                                  * first time we touch this device after firmware upload,
 221                                  * so we don't know the address yet.
 222                                  */
 223                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 224                 } else {
 225                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 226                         break;
 227                 }
 228
 229                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 230                 if (ret != SR_OK) {
 231                         sr_err("fx2lafw: Failed to retrieve "
 232                                "firmware version information.");
 233                         break;
 234                 }
 235
 236                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 237                     vi.minor != FX2LAFW_VERSION_MINOR) {
 238                         sr_err("fx2lafw: Expected firmware version %d.%02d "
 239                                "got %d.%02d.", FX2LAFW_VERSION_MAJOR,
 240                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 241                         break;
 242                 }
 243
 244                 sdi->status = SR_ST_ACTIVE;
 245                 sr_info("fx2lafw: Opened device %d on %d.%d "
 246                         "interface %d, firmware version %d.%02d",
 247                         sdi->index, ctx->usb->bus, ctx->usb->address,
 248                         USB_INTERFACE, vi.major, vi.minor);
 249
 250                 break;
 251         }
 252         libusb_free_device_list(devlist, 1);
 253
 254         if (sdi->status != SR_ST_ACTIVE)
 255                 return SR_ERR;
 256
 257         return SR_OK;
 258 }
 259
 260 static void close_dev(struct sr_dev_inst *sdi)
 261 {
 262         struct context *ctx;
 263
 264         ctx = sdi->priv;
 265
 266         if (ctx->usb->devhdl == NULL)
 267                 return;
 268
 269         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 270                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 271         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 272         libusb_close(ctx->usb->devhdl);
 273         ctx->usb->devhdl = NULL;
 274         sdi->status = SR_ST_INACTIVE;
 275 }
 276
 277 static int configure_probes(struct context *ctx, GSList *probes)
 278 {
 279         struct sr_probe *probe;
 280         GSList *l;
 281         int probe_bit, stage, i;
 282         char *tc;
 283
 284         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 285                 ctx->trigger_mask[i] = 0;
 286                 ctx->trigger_value[i] = 0;
 287         }
 288
 289         stage = -1;
 290         for (l = probes; l; l = l->next) {
 291                 probe = (struct sr_probe *)l->data;
 292                 if (probe->enabled == FALSE)
 293                         continue;
 294                 probe_bit = 1 << (probe->index - 1);
 295                 if (!(probe->trigger))
 296                         continue;
 297
 298                 stage = 0;
 299                 for (tc = probe->trigger; *tc; tc++) {
 300                         ctx->trigger_mask[stage] |= probe_bit;
 301                         if (*tc == '1')
 302                                 ctx->trigger_value[stage] |= probe_bit;
 303                         stage++;
 304                         if (stage > NUM_TRIGGER_STAGES)
 305                                 return SR_ERR;
 306                 }
 307         }
 308
 309         if (stage == -1)
 310                 /*
 311                  * We didn't configure any triggers, make sure acquisition
 312                  * doesn't wait for any.
 313                  */
 314                 ctx->trigger_stage = TRIGGER_FIRED;
 315         else
 316                 ctx->trigger_stage = 0;
 317
 318         return SR_OK;
 319 }
 320
 321 static struct context *fx2lafw_dev_new(void)
 322 {
 323         struct context *ctx;
 324
 325         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 326                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 327                 return NULL;
 328         }
 329
 330         ctx->trigger_stage = TRIGGER_FIRED;
 331
 332         return ctx;
 333 }
 334
 335 /*
 336  * API callbacks
 337  */
 338
 339 static int hw_init(const char *devinfo)
 340 {
 341         struct sr_dev_inst *sdi;
 342         struct libusb_device_descriptor des;
 343         const struct fx2lafw_profile *prof;
 344         struct context *ctx;
 345         libusb_device **devlist;
 346         int ret;
 347         int devcnt = 0;
 348         int i, j;
 349
 350         /* Avoid compiler warnings. */
 351         (void)devinfo;
 352
 353         if (libusb_init(&usb_context) != 0) {
 354                 sr_warn("fx2lafw: Failed to initialize libusb.");
 355                 return 0;
 356         }
 357
 358         /* Find all fx2lafw compatible devices and upload firware to them. */
 359         libusb_get_device_list(usb_context, &devlist);
 360         for (i = 0; devlist[i]; i++) {
 361
 362                 if ((ret = libusb_get_device_descriptor(
 363                      devlist[i], &des)) != 0) {
 364                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 365                         continue;
 366                 }
 367
 368                 prof = NULL;
 369                 for (j = 0; supported_fx2[j].vid; j++) {
 370                         if (des.idVendor == supported_fx2[j].vid &&
 371                                 des.idProduct == supported_fx2[j].pid) {
 372                                 prof = &supported_fx2[j];
 373                         }
 374                 }
 375
 376                 /* Skip if the device was not found */
 377                 if (!prof)
 378                         continue;
 379
 380                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 381                         prof->vendor, prof->model, prof->model_version);
 382                 if (!sdi)
 383                         return 0;
 384
 385                 ctx = fx2lafw_dev_new();
 386                 ctx->profile = prof;
 387                 sdi->priv = ctx;
 388                 dev_insts = g_slist_append(dev_insts, sdi);
 389
 390                 if (check_conf_profile(devlist[i])) {
 391                         /* Already has the firmware, so fix the new address. */
 392                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 393                         sdi->status = SR_ST_INACTIVE;
 394                         ctx->usb = sr_usb_dev_inst_new
 395                             (libusb_get_bus_number(devlist[i]),
 396                              libusb_get_device_address(devlist[i]), NULL);
 397                 } else {
 398                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 399                                 prof->firmware) == SR_OK)
 400                                 /* Remember when the firmware on this device was updated */
 401                                 g_get_current_time(&ctx->fw_updated);
 402                         else
 403                                 sr_err("fx2lafw: Firmware upload failed for "
 404                                        "device %d.", devcnt);
 405                         ctx->usb = sr_usb_dev_inst_new
 406                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 407                 }
 408
 409                 devcnt++;
 410         }
 411         libusb_free_device_list(devlist, 1);
 412
 413         return devcnt;
 414 }
 415
 416 static int hw_dev_open(int dev_index)
 417 {
 418         GTimeVal cur_time;
 419         struct sr_dev_inst *sdi;
 420         struct context *ctx;
 421         int timediff, ret;
 422
 423         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 424                 return SR_ERR;
 425         ctx = sdi->priv;
 426
 427         /*
 428          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 429          * for the FX2 to renumerate.
 430          */
 431         ret = 0;
 432         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 433                 sr_info("fx2lafw: Waiting for device to reset.");
 434                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 435                 g_usleep(300 * 1000);
 436                 timediff = 0;
 437                 while (timediff < MAX_RENUM_DELAY) {
 438                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 439                                 break;
 440                         g_usleep(100 * 1000);
 441                         g_get_current_time(&cur_time);
 442                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 443                 }
 444                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 445         } else {
 446                 ret = fx2lafw_dev_open(dev_index);
 447         }
 448
 449         if (ret != SR_OK) {
 450                 sr_err("fx2lafw: Unable to open device.");
 451                 return SR_ERR;
 452         }
 453         ctx = sdi->priv;
 454
 455         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 456         if (ret != 0) {
 457                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 458                 return SR_ERR;
 459         }
 460
 461         if (ctx->cur_samplerate == 0) {
 462                 /* Samplerate hasn't been set; default to the slowest one. */
 463                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 464                     &supported_samplerates[0]) == SR_ERR)
 465                         return SR_ERR;
 466         }
 467
 468         return SR_OK;
 469 }
 470
 471 static int hw_dev_close(int dev_index)
 472 {
 473         struct sr_dev_inst *sdi;
 474
 475         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 476                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 477                 return SR_ERR_BUG;
 478         }
 479
 480         /* TODO */
 481         close_dev(sdi);
 482
 483         return SR_OK;
 484 }
 485
 486 static int hw_cleanup(void)
 487 {
 488         GSList *l;
 489         struct sr_dev_inst *sdi;
 490         struct context *ctx;
 491         int ret = SR_OK;
 492
 493         for (l = dev_insts; l; l = l->next) {
 494                 if (!(sdi = l->data)) {
 495                         /* Log error, but continue cleaning up the rest. */
 496                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 497                                __func__);
 498                         ret = SR_ERR_BUG;
 499                         continue;
 500                 }
 501                 if (!(ctx = sdi->priv)) {
 502                         /* Log error, but continue cleaning up the rest. */
 503                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 504                                __func__);
 505                         ret = SR_ERR_BUG;
 506                         continue;
 507                 }
 508                 close_dev(sdi);
 509                 sdi = l->data;
 510                 sr_dev_inst_free(sdi);
 511         }
 512
 513         g_slist_free(dev_insts);
 514         dev_insts = NULL;
 515
 516         if (usb_context)
 517                 libusb_exit(usb_context);
 518         usb_context = NULL;
 519
 520         return ret;
 521 }
 522
 523 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 524 {
 525         struct sr_dev_inst *sdi;
 526         struct context *ctx;
 527
 528         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 529                 return NULL;
 530         ctx = sdi->priv;
 531
 532         switch (dev_info_id) {
 533         case SR_DI_INST:
 534                 return sdi;
 535         case SR_DI_NUM_PROBES:
 536                 return GINT_TO_POINTER(ctx->profile->num_probes);
 537         case SR_DI_PROBE_NAMES:
 538                 return probe_names;
 539         case SR_DI_SAMPLERATES:
 540                 return &samplerates;
 541         case SR_DI_TRIGGER_TYPES:
 542                 return TRIGGER_TYPES;
 543         case SR_DI_CUR_SAMPLERATE:
 544                 return &ctx->cur_samplerate;
 545         }
 546
 547         return NULL;
 548 }
 549
 550 static int hw_dev_status_get(int dev_index)
 551 {
 552         const struct sr_dev_inst *const sdi =
 553                 sr_dev_inst_get(dev_insts, dev_index);
 554
 555         if (!sdi)
 556                 return SR_ST_NOT_FOUND;
 557
 558         return sdi->status;
 559 }
 560
 561 static int *hw_hwcap_get_all(void)
 562 {
 563         return hwcaps;
 564 }
 565
 566 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 567 {
 568         struct sr_dev_inst *sdi;
 569         struct context *ctx;
 570         int ret;
 571
 572         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 573                 return SR_ERR;
 574         ctx = sdi->priv;
 575
 576         if (hwcap == SR_HWCAP_SAMPLERATE) {
 577                 ctx->cur_samplerate = *(uint64_t *)value;
 578                 ret = SR_OK;
 579         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 580                 ret = configure_probes(ctx, (GSList *) value);
 581         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 582                 ctx->limit_samples = *(uint64_t *)value;
 583                 ret = SR_OK;
 584         } else {
 585                 ret = SR_ERR;
 586         }
 587
 588         return ret;
 589 }
 590
 591 static int receive_data(int fd, int revents, void *cb_data)
 592 {
 593         struct timeval tv;
 594
 595         /* Avoid compiler warnings. */
 596         (void)fd;
 597         (void)revents;
 598         (void)cb_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 abort_acquisition(struct context *ctx)
 607 {
 608         ctx->num_samples = -1;
 609 }
 610
 611 static void finish_acquisition(struct context *ctx)
 612 {
 613         struct sr_datafeed_packet packet;
 614         int i;
 615
 616         /* Terminate session */
 617         packet.type = SR_DF_END;
 618         sr_session_send(ctx->session_dev_id, &packet);
 619
 620         /* Remove fds from polling */
 621         const struct libusb_pollfd **const lupfd =
 622                 libusb_get_pollfds(usb_context);
 623         for (i = 0; lupfd[i]; i++)
 624                 sr_source_remove(lupfd[i]->fd);
 625         free(lupfd); /* NOT g_free()! */
 626 }
 627
 628 static void receive_transfer(struct libusb_transfer *transfer)
 629 {
 630         /* TODO: These statics have to move to the ctx struct. */
 631         static int empty_transfer_count = 0;
 632         struct sr_datafeed_packet packet;
 633         struct sr_datafeed_logic logic;
 634         struct context *ctx = transfer->user_data;
 635         int cur_buflen, trigger_offset, i;
 636         unsigned char *cur_buf, *new_buf;
 637
 638         /*
 639          * If acquisition has already ended, just free any queued up
 640          * transfer that come in.
 641          */
 642         if (ctx->num_samples == -1) {
 643                 if (transfer)
 644                         libusb_free_transfer(transfer);
 645
 646                 ctx->submitted_transfers--;
 647                 if (ctx->submitted_transfers == 0)
 648                         finish_acquisition(ctx);
 649
 650                 return;
 651         }
 652
 653         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 654                 transfer->status, transfer->actual_length);
 655
 656         /* Save incoming transfer before reusing the transfer struct. */
 657         cur_buf = transfer->buffer;
 658         cur_buflen = transfer->actual_length;
 659
 660         /* Fire off a new request. */
 661         if (!(new_buf = g_try_malloc(4096))) {
 662                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 663                 return; /* TODO: SR_ERR_MALLOC */
 664         }
 665
 666         transfer->buffer = new_buf;
 667         transfer->length = 4096;
 668         if (libusb_submit_transfer(transfer) != 0) {
 669                 /* TODO: Stop session? */
 670                 /* TODO: Better error message. */
 671                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 672         }
 673
 674         if (cur_buflen == 0) {
 675                 empty_transfer_count++;
 676                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 677                         /*
 678                          * The FX2 gave up. End the acquisition, the frontend
 679                          * will work out that the samplecount is short.
 680                          */
 681                         abort_acquisition(ctx);
 682                 }
 683                 return;
 684         } else {
 685                 empty_transfer_count = 0;
 686         }
 687
 688         trigger_offset = 0;
 689         if (ctx->trigger_stage >= 0) {
 690                 for (i = 0; i < cur_buflen; i++) {
 691
 692                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 693                                 /* Match on this trigger stage. */
 694                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 695                                 ctx->trigger_stage++;
 696
 697                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 698                                         /* Match on all trigger stages, we're done. */
 699                                         trigger_offset = i + 1;
 700
 701                                         /*
 702                                          * TODO: Send pre-trigger buffer to session bus.
 703                                          * Tell the frontend we hit the trigger here.
 704                                          */
 705                                         packet.type = SR_DF_TRIGGER;
 706                                         packet.payload = NULL;
 707                                         sr_session_send(ctx->session_dev_id, &packet);
 708
 709                                         /*
 710                                          * Send the samples that triggered it, since we're
 711                                          * skipping past them.
 712                                          */
 713                                         packet.type = SR_DF_LOGIC;
 714                                         packet.payload = &logic;
 715                                         logic.length = ctx->trigger_stage;
 716                                         logic.unitsize = 1;
 717                                         logic.data = ctx->trigger_buffer;
 718                                         sr_session_send(ctx->session_dev_id, &packet);
 719
 720                                         ctx->trigger_stage = TRIGGER_FIRED;
 721                                         break;
 722                                 }
 723                                 return;
 724                         }
 725
 726                         /*
 727                          * We had a match before, but not in the next sample. However, we may
 728                          * have a match on this stage in the next bit -- trigger on 0001 will
 729                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 730                          * the next sample from the one that matched originally, which the
 731                          * counter increment at the end of the loop takes care of.
 732                          */
 733                         if (ctx->trigger_stage > 0) {
 734                                 i -= ctx->trigger_stage;
 735                                 if (i < -1)
 736                                         i = -1; /* Oops, went back past this buffer. */
 737                                 /* Reset trigger stage. */
 738                                 ctx->trigger_stage = 0;
 739                         }
 740                 }
 741         }
 742
 743         if (ctx->trigger_stage == TRIGGER_FIRED) {
 744                 /* Send the incoming transfer to the session bus. */
 745                 packet.type = SR_DF_LOGIC;
 746                 packet.payload = &logic;
 747                 logic.length = cur_buflen - trigger_offset;
 748                 logic.unitsize = 1;
 749                 logic.data = cur_buf + trigger_offset;
 750                 sr_session_send(ctx->session_dev_id, &packet);
 751                 g_free(cur_buf);
 752
 753                 ctx->num_samples += cur_buflen;
 754                 if (ctx->limit_samples &&
 755                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 756                         abort_acquisition(ctx);
 757                 }
 758         } else {
 759                 /*
 760                  * TODO: Buffer pre-trigger data in capture
 761                  * ratio-sized buffer.
 762                  */
 763         }
 764 }
 765
 766 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 767 {
 768         struct sr_dev_inst *sdi;
 769         struct sr_datafeed_packet *packet;
 770         struct sr_datafeed_header *header;
 771         struct context *ctx;
 772         struct libusb_transfer *transfer;
 773         const struct libusb_pollfd **lupfd;
 774         int ret, size, i;
 775         unsigned char *buf;
 776
 777         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 778                 return SR_ERR;
 779         ctx = sdi->priv;
 780         ctx->session_dev_id = cb_data;
 781         ctx->num_samples = 0;
 782
 783         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 784                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 785                 return SR_ERR_MALLOC;
 786         }
 787
 788         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 789                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 790                 return SR_ERR_MALLOC;
 791         }
 792
 793         /* Start with 2K transfer, subsequently increased to 4K. */
 794         size = 2048;
 795         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 796                 if (!(buf = g_try_malloc(size))) {
 797                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 798                         return SR_ERR_MALLOC;
 799                 }
 800                 transfer = libusb_alloc_transfer(0);
 801                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 802                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 803                                 receive_transfer, ctx, 40);
 804                 if (libusb_submit_transfer(transfer) != 0) {
 805                         /* TODO: Free them all. */
 806                         libusb_free_transfer(transfer);
 807                         g_free(buf);
 808                         return SR_ERR;
 809                 }
 810
 811                 ctx->submitted_transfers++;
 812                 size = 4096;
 813         }
 814
 815         lupfd = libusb_get_pollfds(usb_context);
 816         for (i = 0; lupfd[i]; i++)
 817                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 818                               40, receive_data, NULL);
 819         free(lupfd); /* NOT g_free()! */
 820
 821         packet->type = SR_DF_HEADER;
 822         packet->payload = header;
 823         header->feed_version = 1;
 824         gettimeofday(&header->starttime, NULL);
 825         header->samplerate = ctx->cur_samplerate;
 826         header->num_logic_probes = ctx->profile->num_probes;
 827         sr_session_send(cb_data, packet);
 828         g_free(header);
 829         g_free(packet);
 830
 831         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 832                 ctx->cur_samplerate)) != SR_OK) {
 833                 return ret;
 834         }
 835
 836         return SR_OK;
 837 }
 838
 839 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 840 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 841 {
 842         struct sr_dev_inst *sdi;
 843
 844         /* Avoid compiler warnings. */
 845         (void)cb_data;
 846
 847         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 848                 return SR_ERR;
 849
 850         abort_acquisition(sdi->priv);
 851
 852         return SR_OK;
 853 }
 854
 855 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 856         .name = "fx2lafw",
 857         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 858         .api_version = 1,
 859         .init = hw_init,
 860         .cleanup = hw_cleanup,
 861         .dev_open = hw_dev_open,
 862         .dev_close = hw_dev_close,
 863         .dev_info_get = hw_dev_info_get,
 864         .dev_status_get = hw_dev_status_get,
 865         .hwcap_get_all = hw_hwcap_get_all,
 866         .dev_config_set = hw_dev_config_set,
 867         .dev_acquisition_start = hw_dev_acquisition_start,
 868         .dev_acquisition_stop = hw_dev_acquisition_stop,
 869 };