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 <string.h>
  23 #include <inttypes.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          * Robomotic BugLogic 3
  50          */
  51         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  52                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  53
  54         /*
  55          * Default Cypress FX2 without EEPROM, e.g.:
  56          * Lcsoft Mini Board
  57          * Braintechnology USB Interface V2.x
  58          */
  59         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  60                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  61
  62         /*
  63          * Braintechnology USB-LPS
  64          */
  65         { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
  66                 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw", 8 },
  67
  68         { 0, 0, 0, 0, 0, 0, 0 }
  69 };
  70
  71 static int hwcaps[] = {
  72         SR_HWCAP_LOGIC_ANALYZER,
  73         SR_HWCAP_SAMPLERATE,
  74
  75         /* These are really implemented in the driver, not the hardware. */
  76         SR_HWCAP_LIMIT_SAMPLES,
  77         SR_HWCAP_CONTINUOUS,
  78         0,
  79 };
  80
  81 /*
  82  * TODO: Different probe_names[] for each supported device.
  83  */
  84 static const char *probe_names[] = {
  85         "0",
  86         "1",
  87         "2",
  88         "3",
  89         "4",
  90         "5",
  91         "6",
  92         "7",
  93         NULL,
  94 };
  95
  96 static uint64_t supported_samplerates[] = {
  97         SR_KHZ(50),
  98         SR_KHZ(100),
  99         SR_KHZ(200),
 100         SR_KHZ(250),
 101         SR_KHZ(500),
 102         SR_MHZ(1),
 103         SR_MHZ(2),
 104         SR_MHZ(3),
 105         SR_MHZ(4),
 106         SR_MHZ(6),
 107         SR_MHZ(8),
 108         SR_MHZ(12),
 109         SR_MHZ(16),
 110         SR_MHZ(24),
 111         0,
 112 };
 113
 114 static struct sr_samplerates samplerates = {
 115         0,
 116         0,
 117         0,
 118         supported_samplerates,
 119 };
 120
 121 static GSList *dev_insts = NULL;
 122 static libusb_context *usb_context = NULL;
 123
 124 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 125 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 126
 127 /**
 128  * Check the USB configuration to determine if this is an fx2lafw device.
 129  *
 130  * @return TRUE if the device's configuration profile match fx2lafw
 131  *         configuration, FALSE otherwise.
 132  */
 133 static gboolean check_conf_profile(libusb_device *dev)
 134 {
 135         struct libusb_device_descriptor des;
 136         struct libusb_device_handle *hdl;
 137         gboolean ret;
 138         unsigned char strdesc[64];
 139
 140         hdl = NULL;
 141         ret = FALSE;
 142         while (!ret) {
 143                 /* Assume the FW has not been loaded, unless proven wrong. */
 144                 if (libusb_get_device_descriptor(dev, &des) != 0)
 145                         break;
 146
 147                 if (libusb_open(dev, &hdl) != 0)
 148                         break;
 149
 150                 if (libusb_get_string_descriptor_ascii(hdl,
 151                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 152                         break;
 153                 if (strncmp((const char *)strdesc, "sigrok", 6))
 154                         break;
 155
 156                 if (libusb_get_string_descriptor_ascii(hdl,
 157                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 158                         break;
 159                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 160                         break;
 161
 162                 /* If we made it here, it must be an fx2lafw. */
 163                 ret = TRUE;
 164         }
 165         if (hdl)
 166                 libusb_close(hdl);
 167
 168         return ret;
 169 }
 170
 171 static int fx2lafw_dev_open(int dev_index)
 172 {
 173         libusb_device **devlist;
 174         struct libusb_device_descriptor des;
 175         struct sr_dev_inst *sdi;
 176         struct context *ctx;
 177         struct version_info vi;
 178         int ret, skip, i;
 179         uint8_t revid;
 180
 181         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 182                 return SR_ERR;
 183         ctx = sdi->priv;
 184
 185         if (sdi->status == SR_ST_ACTIVE)
 186                 /* already in use */
 187                 return SR_ERR;
 188
 189         skip = 0;
 190         const int device_count = libusb_get_device_list(usb_context, &devlist);
 191         if (device_count < 0) {
 192                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 193                         device_count);
 194                 return SR_ERR;
 195         }
 196
 197         for (i = 0; i < device_count; i++) {
 198                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 199                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 200                                ret);
 201                         continue;
 202                 }
 203
 204                 if (des.idVendor != ctx->profile->vid
 205                     || des.idProduct != ctx->profile->pid)
 206                         continue;
 207
 208                 if (sdi->status == SR_ST_INITIALIZING) {
 209                         if (skip != dev_index) {
 210                                 /* Skip devices of this type that aren't the one we want. */
 211                                 skip += 1;
 212                                 continue;
 213                         }
 214                 } else if (sdi->status == SR_ST_INACTIVE) {
 215                         /*
 216                          * This device is fully enumerated, so we need to find
 217                          * this device by vendor, product, bus and address.
 218                          */
 219                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 220                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 221                                 /* this is not the one */
 222                                 continue;
 223                 }
 224
 225                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 226                         if (ctx->usb->address == 0xff)
 227                                 /*
 228                                  * first time we touch this device after firmware upload,
 229                                  * so we don't know the address yet.
 230                                  */
 231                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 232                 } else {
 233                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 234                         break;
 235                 }
 236
 237                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 238                 if (ret != SR_OK) {
 239                         sr_err("fx2lafw: Failed to retrieve "
 240                                "firmware version information.");
 241                         break;
 242                 }
 243
 244                 ret = command_get_revid_version(ctx->usb->devhdl, &revid);
 245                 if (ret != SR_OK) {
 246                         sr_err("fx2lafw: Failed to retrieve REVID.");
 247                         break;
 248                 }
 249
 250                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 251                     vi.minor != FX2LAFW_VERSION_MINOR) {
 252                         sr_err("fx2lafw: Expected firmware version %d.%d "
 253                                "got %d.%d.", FX2LAFW_VERSION_MAJOR,
 254                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 255                         break;
 256                 }
 257
 258                 sdi->status = SR_ST_ACTIVE;
 259                 sr_info("fx2lafw: Opened device %d on %d.%d "
 260                         "interface %d, firmware %d.%d, REVID %d.",
 261                         sdi->index, ctx->usb->bus, ctx->usb->address,
 262                         USB_INTERFACE, vi.major, vi.minor, revid);
 263
 264                 break;
 265         }
 266         libusb_free_device_list(devlist, 1);
 267
 268         if (sdi->status != SR_ST_ACTIVE)
 269                 return SR_ERR;
 270
 271         return SR_OK;
 272 }
 273
 274 static void close_dev(struct sr_dev_inst *sdi)
 275 {
 276         struct context *ctx;
 277
 278         ctx = sdi->priv;
 279
 280         if (ctx->usb->devhdl == NULL)
 281                 return;
 282
 283         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 284                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 285         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 286         libusb_close(ctx->usb->devhdl);
 287         ctx->usb->devhdl = NULL;
 288         sdi->status = SR_ST_INACTIVE;
 289 }
 290
 291 static int configure_probes(struct context *ctx, GSList *probes)
 292 {
 293         struct sr_probe *probe;
 294         GSList *l;
 295         int probe_bit, stage, i;
 296         char *tc;
 297
 298         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 299                 ctx->trigger_mask[i] = 0;
 300                 ctx->trigger_value[i] = 0;
 301         }
 302
 303         stage = -1;
 304         for (l = probes; l; l = l->next) {
 305                 probe = (struct sr_probe *)l->data;
 306                 if (probe->enabled == FALSE)
 307                         continue;
 308                 probe_bit = 1 << (probe->index - 1);
 309                 if (!(probe->trigger))
 310                         continue;
 311
 312                 stage = 0;
 313                 for (tc = probe->trigger; *tc; tc++) {
 314                         ctx->trigger_mask[stage] |= probe_bit;
 315                         if (*tc == '1')
 316                                 ctx->trigger_value[stage] |= probe_bit;
 317                         stage++;
 318                         if (stage > NUM_TRIGGER_STAGES)
 319                                 return SR_ERR;
 320                 }
 321         }
 322
 323         if (stage == -1)
 324                 /*
 325                  * We didn't configure any triggers, make sure acquisition
 326                  * doesn't wait for any.
 327                  */
 328                 ctx->trigger_stage = TRIGGER_FIRED;
 329         else
 330                 ctx->trigger_stage = 0;
 331
 332         return SR_OK;
 333 }
 334
 335 static struct context *fx2lafw_dev_new(void)
 336 {
 337         struct context *ctx;
 338
 339         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 340                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 341                 return NULL;
 342         }
 343
 344         ctx->trigger_stage = TRIGGER_FIRED;
 345
 346         return ctx;
 347 }
 348
 349 /*
 350  * API callbacks
 351  */
 352
 353 static int hw_init(const char *devinfo)
 354 {
 355         struct sr_dev_inst *sdi;
 356         struct libusb_device_descriptor des;
 357         const struct fx2lafw_profile *prof;
 358         struct context *ctx;
 359         libusb_device **devlist;
 360         int ret;
 361         int devcnt = 0;
 362         int i, j;
 363
 364         /* Avoid compiler warnings. */
 365         (void)devinfo;
 366
 367         if (libusb_init(&usb_context) != 0) {
 368                 sr_warn("fx2lafw: Failed to initialize libusb.");
 369                 return 0;
 370         }
 371
 372         /* Find all fx2lafw compatible devices and upload firware to them. */
 373         libusb_get_device_list(usb_context, &devlist);
 374         for (i = 0; devlist[i]; i++) {
 375
 376                 if ((ret = libusb_get_device_descriptor(
 377                      devlist[i], &des)) != 0) {
 378                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 379                         continue;
 380                 }
 381
 382                 prof = NULL;
 383                 for (j = 0; supported_fx2[j].vid; j++) {
 384                         if (des.idVendor == supported_fx2[j].vid &&
 385                                 des.idProduct == supported_fx2[j].pid) {
 386                                 prof = &supported_fx2[j];
 387                         }
 388                 }
 389
 390                 /* Skip if the device was not found */
 391                 if (!prof)
 392                         continue;
 393
 394                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 395                         prof->vendor, prof->model, prof->model_version);
 396                 if (!sdi)
 397                         return 0;
 398
 399                 ctx = fx2lafw_dev_new();
 400                 ctx->profile = prof;
 401                 sdi->priv = ctx;
 402                 dev_insts = g_slist_append(dev_insts, sdi);
 403
 404                 if (check_conf_profile(devlist[i])) {
 405                         /* Already has the firmware, so fix the new address. */
 406                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 407                         sdi->status = SR_ST_INACTIVE;
 408                         ctx->usb = sr_usb_dev_inst_new
 409                             (libusb_get_bus_number(devlist[i]),
 410                              libusb_get_device_address(devlist[i]), NULL);
 411                 } else {
 412                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 413                                 prof->firmware) == SR_OK)
 414                                 /* Remember when the firmware on this device was updated */
 415                                 g_get_current_time(&ctx->fw_updated);
 416                         else
 417                                 sr_err("fx2lafw: Firmware upload failed for "
 418                                        "device %d.", devcnt);
 419                         ctx->usb = sr_usb_dev_inst_new
 420                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 421                 }
 422
 423                 devcnt++;
 424         }
 425         libusb_free_device_list(devlist, 1);
 426
 427         return devcnt;
 428 }
 429
 430 static int hw_dev_open(int dev_index)
 431 {
 432         GTimeVal cur_time;
 433         struct sr_dev_inst *sdi;
 434         struct context *ctx;
 435         int timediff, ret;
 436
 437         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 438                 return SR_ERR;
 439         ctx = sdi->priv;
 440
 441         /*
 442          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 443          * for the FX2 to renumerate.
 444          */
 445         ret = 0;
 446         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 447                 sr_info("fx2lafw: Waiting for device to reset.");
 448                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 449                 g_usleep(300 * 1000);
 450                 timediff = 0;
 451                 while (timediff < MAX_RENUM_DELAY) {
 452                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 453                                 break;
 454                         g_usleep(100 * 1000);
 455                         g_get_current_time(&cur_time);
 456                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 457                 }
 458                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 459         } else {
 460                 ret = fx2lafw_dev_open(dev_index);
 461         }
 462
 463         if (ret != SR_OK) {
 464                 sr_err("fx2lafw: Unable to open device.");
 465                 return SR_ERR;
 466         }
 467         ctx = sdi->priv;
 468
 469         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 470         if (ret != 0) {
 471                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 472                 return SR_ERR;
 473         }
 474
 475         if (ctx->cur_samplerate == 0) {
 476                 /* Samplerate hasn't been set; default to the slowest one. */
 477                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 478                     &supported_samplerates[0]) == SR_ERR)
 479                         return SR_ERR;
 480         }
 481
 482         return SR_OK;
 483 }
 484
 485 static int hw_dev_close(int dev_index)
 486 {
 487         struct sr_dev_inst *sdi;
 488
 489         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 490                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 491                 return SR_ERR_BUG;
 492         }
 493
 494         /* TODO */
 495         close_dev(sdi);
 496
 497         return SR_OK;
 498 }
 499
 500 static int hw_cleanup(void)
 501 {
 502         GSList *l;
 503         struct sr_dev_inst *sdi;
 504         struct context *ctx;
 505         int ret = SR_OK;
 506
 507         for (l = dev_insts; l; l = l->next) {
 508                 if (!(sdi = l->data)) {
 509                         /* Log error, but continue cleaning up the rest. */
 510                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 511                                __func__);
 512                         ret = SR_ERR_BUG;
 513                         continue;
 514                 }
 515                 if (!(ctx = sdi->priv)) {
 516                         /* Log error, but continue cleaning up the rest. */
 517                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 518                                __func__);
 519                         ret = SR_ERR_BUG;
 520                         continue;
 521                 }
 522                 close_dev(sdi);
 523                 sdi = l->data;
 524                 sr_dev_inst_free(sdi);
 525         }
 526
 527         g_slist_free(dev_insts);
 528         dev_insts = NULL;
 529
 530         if (usb_context)
 531                 libusb_exit(usb_context);
 532         usb_context = NULL;
 533
 534         return ret;
 535 }
 536
 537 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 538 {
 539         struct sr_dev_inst *sdi;
 540         struct context *ctx;
 541
 542         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 543                 return NULL;
 544         ctx = sdi->priv;
 545
 546         switch (dev_info_id) {
 547         case SR_DI_INST:
 548                 return sdi;
 549         case SR_DI_NUM_PROBES:
 550                 return GINT_TO_POINTER(ctx->profile->num_probes);
 551         case SR_DI_PROBE_NAMES:
 552                 return probe_names;
 553         case SR_DI_SAMPLERATES:
 554                 return &samplerates;
 555         case SR_DI_TRIGGER_TYPES:
 556                 return TRIGGER_TYPES;
 557         case SR_DI_CUR_SAMPLERATE:
 558                 return &ctx->cur_samplerate;
 559         }
 560
 561         return NULL;
 562 }
 563
 564 static int hw_dev_status_get(int dev_index)
 565 {
 566         const struct sr_dev_inst *const sdi =
 567                 sr_dev_inst_get(dev_insts, dev_index);
 568
 569         if (!sdi)
 570                 return SR_ST_NOT_FOUND;
 571
 572         return sdi->status;
 573 }
 574
 575 static int *hw_hwcap_get_all(void)
 576 {
 577         return hwcaps;
 578 }
 579
 580 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 581 {
 582         struct sr_dev_inst *sdi;
 583         struct context *ctx;
 584         int ret;
 585
 586         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 587                 return SR_ERR;
 588         ctx = sdi->priv;
 589
 590         if (hwcap == SR_HWCAP_SAMPLERATE) {
 591                 ctx->cur_samplerate = *(uint64_t *)value;
 592                 ret = SR_OK;
 593         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 594                 ret = configure_probes(ctx, (GSList *) value);
 595         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 596                 ctx->limit_samples = *(uint64_t *)value;
 597                 ret = SR_OK;
 598         } else {
 599                 ret = SR_ERR;
 600         }
 601
 602         return ret;
 603 }
 604
 605 static int receive_data(int fd, int revents, void *cb_data)
 606 {
 607         struct timeval tv;
 608
 609         /* Avoid compiler warnings. */
 610         (void)fd;
 611         (void)revents;
 612         (void)cb_data;
 613
 614         tv.tv_sec = tv.tv_usec = 0;
 615         libusb_handle_events_timeout(usb_context, &tv);
 616
 617         return TRUE;
 618 }
 619
 620 static void abort_acquisition(struct context *ctx)
 621 {
 622         ctx->num_samples = -1;
 623 }
 624
 625 static void finish_acquisition(struct context *ctx)
 626 {
 627         struct sr_datafeed_packet packet;
 628         int i;
 629
 630         /* Terminate session */
 631         packet.type = SR_DF_END;
 632         sr_session_send(ctx->session_dev_id, &packet);
 633
 634         /* Remove fds from polling */
 635         const struct libusb_pollfd **const lupfd =
 636                 libusb_get_pollfds(usb_context);
 637         for (i = 0; lupfd[i]; i++)
 638                 sr_source_remove(lupfd[i]->fd);
 639         free(lupfd); /* NOT g_free()! */
 640 }
 641
 642 static void receive_transfer(struct libusb_transfer *transfer)
 643 {
 644         /* TODO: These statics have to move to the ctx struct. */
 645         static int empty_transfer_count = 0;
 646         struct sr_datafeed_packet packet;
 647         struct sr_datafeed_logic logic;
 648         struct context *ctx = transfer->user_data;
 649         int cur_buflen, trigger_offset, i;
 650         unsigned char *cur_buf, *new_buf;
 651
 652         /*
 653          * If acquisition has already ended, just free any queued up
 654          * transfer that come in.
 655          */
 656         if (ctx->num_samples == -1) {
 657                 if (transfer)
 658                         libusb_free_transfer(transfer);
 659
 660                 ctx->submitted_transfers--;
 661                 if (ctx->submitted_transfers == 0)
 662                         finish_acquisition(ctx);
 663
 664                 return;
 665         }
 666
 667         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 668                 transfer->status, transfer->actual_length);
 669
 670         /* Save incoming transfer before reusing the transfer struct. */
 671         cur_buf = transfer->buffer;
 672         cur_buflen = transfer->actual_length;
 673
 674         /* Fire off a new request. */
 675         if (!(new_buf = g_try_malloc(4096))) {
 676                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 677                 return; /* TODO: SR_ERR_MALLOC */
 678         }
 679
 680         transfer->buffer = new_buf;
 681         transfer->length = 4096;
 682         if (libusb_submit_transfer(transfer) != 0) {
 683                 /* TODO: Stop session? */
 684                 /* TODO: Better error message. */
 685                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 686         }
 687
 688         if (cur_buflen == 0) {
 689                 empty_transfer_count++;
 690                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 691                         /*
 692                          * The FX2 gave up. End the acquisition, the frontend
 693                          * will work out that the samplecount is short.
 694                          */
 695                         abort_acquisition(ctx);
 696                 }
 697                 return;
 698         } else {
 699                 empty_transfer_count = 0;
 700         }
 701
 702         trigger_offset = 0;
 703         if (ctx->trigger_stage >= 0) {
 704                 for (i = 0; i < cur_buflen; i++) {
 705
 706                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 707                                 /* Match on this trigger stage. */
 708                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 709                                 ctx->trigger_stage++;
 710
 711                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 712                                         /* Match on all trigger stages, we're done. */
 713                                         trigger_offset = i + 1;
 714
 715                                         /*
 716                                          * TODO: Send pre-trigger buffer to session bus.
 717                                          * Tell the frontend we hit the trigger here.
 718                                          */
 719                                         packet.type = SR_DF_TRIGGER;
 720                                         packet.payload = NULL;
 721                                         sr_session_send(ctx->session_dev_id, &packet);
 722
 723                                         /*
 724                                          * Send the samples that triggered it, since we're
 725                                          * skipping past them.
 726                                          */
 727                                         packet.type = SR_DF_LOGIC;
 728                                         packet.payload = &logic;
 729                                         logic.length = ctx->trigger_stage;
 730                                         logic.unitsize = 1;
 731                                         logic.data = ctx->trigger_buffer;
 732                                         sr_session_send(ctx->session_dev_id, &packet);
 733
 734                                         ctx->trigger_stage = TRIGGER_FIRED;
 735                                         break;
 736                                 }
 737                                 return;
 738                         }
 739
 740                         /*
 741                          * We had a match before, but not in the next sample. However, we may
 742                          * have a match on this stage in the next bit -- trigger on 0001 will
 743                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 744                          * the next sample from the one that matched originally, which the
 745                          * counter increment at the end of the loop takes care of.
 746                          */
 747                         if (ctx->trigger_stage > 0) {
 748                                 i -= ctx->trigger_stage;
 749                                 if (i < -1)
 750                                         i = -1; /* Oops, went back past this buffer. */
 751                                 /* Reset trigger stage. */
 752                                 ctx->trigger_stage = 0;
 753                         }
 754                 }
 755         }
 756
 757         if (ctx->trigger_stage == TRIGGER_FIRED) {
 758                 /* Send the incoming transfer to the session bus. */
 759                 packet.type = SR_DF_LOGIC;
 760                 packet.payload = &logic;
 761                 logic.length = cur_buflen - trigger_offset;
 762                 logic.unitsize = 1;
 763                 logic.data = cur_buf + trigger_offset;
 764                 sr_session_send(ctx->session_dev_id, &packet);
 765                 g_free(cur_buf);
 766
 767                 ctx->num_samples += cur_buflen;
 768                 if (ctx->limit_samples &&
 769                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 770                         abort_acquisition(ctx);
 771                 }
 772         } else {
 773                 /*
 774                  * TODO: Buffer pre-trigger data in capture
 775                  * ratio-sized buffer.
 776                  */
 777         }
 778 }
 779
 780 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 781 {
 782         struct sr_dev_inst *sdi;
 783         struct sr_datafeed_packet *packet;
 784         struct sr_datafeed_header *header;
 785         struct context *ctx;
 786         struct libusb_transfer *transfer;
 787         const struct libusb_pollfd **lupfd;
 788         int ret, size, i;
 789         unsigned char *buf;
 790
 791         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 792                 return SR_ERR;
 793         ctx = sdi->priv;
 794         ctx->session_dev_id = cb_data;
 795         ctx->num_samples = 0;
 796
 797         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 798                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 799                 return SR_ERR_MALLOC;
 800         }
 801
 802         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 803                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 804                 return SR_ERR_MALLOC;
 805         }
 806
 807         /* Start with 2K transfer, subsequently increased to 4K. */
 808         size = 2048;
 809         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 810                 if (!(buf = g_try_malloc(size))) {
 811                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 812                         return SR_ERR_MALLOC;
 813                 }
 814                 transfer = libusb_alloc_transfer(0);
 815                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 816                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 817                                 receive_transfer, ctx, 40);
 818                 if (libusb_submit_transfer(transfer) != 0) {
 819                         /* TODO: Free them all. */
 820                         libusb_free_transfer(transfer);
 821                         g_free(buf);
 822                         return SR_ERR;
 823                 }
 824
 825                 ctx->submitted_transfers++;
 826                 size = 4096;
 827         }
 828
 829         lupfd = libusb_get_pollfds(usb_context);
 830         for (i = 0; lupfd[i]; i++)
 831                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 832                               40, receive_data, NULL);
 833         free(lupfd); /* NOT g_free()! */
 834
 835         packet->type = SR_DF_HEADER;
 836         packet->payload = header;
 837         header->feed_version = 1;
 838         gettimeofday(&header->starttime, NULL);
 839         header->samplerate = ctx->cur_samplerate;
 840         header->num_logic_probes = ctx->profile->num_probes;
 841         sr_session_send(cb_data, packet);
 842         g_free(header);
 843         g_free(packet);
 844
 845         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 846                 ctx->cur_samplerate)) != SR_OK) {
 847                 return ret;
 848         }
 849
 850         return SR_OK;
 851 }
 852
 853 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 854 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 855 {
 856         struct sr_dev_inst *sdi;
 857
 858         /* Avoid compiler warnings. */
 859         (void)cb_data;
 860
 861         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 862                 return SR_ERR;
 863
 864         abort_acquisition(sdi->priv);
 865
 866         return SR_OK;
 867 }
 868
 869 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 870         .name = "fx2lafw",
 871         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 872         .api_version = 1,
 873         .init = hw_init,
 874         .cleanup = hw_cleanup,
 875         .dev_open = hw_dev_open,
 876         .dev_close = hw_dev_close,
 877         .dev_info_get = hw_dev_info_get,
 878         .dev_status_get = hw_dev_status_get,
 879         .hwcap_get_all = hw_hwcap_get_all,
 880         .dev_config_set = hw_dev_config_set,
 881         .dev_acquisition_start = hw_dev_acquisition_start,
 882         .dev_acquisition_stop = hw_dev_acquisition_stop,
 883 };