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 <glib.h>
  25 #include <libusb.h>
  26 #include "config.h"
  27 #include "sigrok.h"
  28 #include "sigrok-internal.h"
  29 #include "fx2lafw.h"
  30 #include "command.h"
  31
  32 static const struct fx2lafw_profile supported_fx2[] = {
  33         /*
  34          * CWAV USBee AX
  35          * EE Electronics ESLA201A
  36          */
  37         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  38                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  39
  40         /*
  41          * CWAV USBee SX
  42          */
  43         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  44                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  45
  46         /*
  47          * Saleae Logic
  48          * EE Electronics ESLA100
  49          * Robomotic MiniLogic
  50          */
  51         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  52                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  53
  54         /*
  55          * Default Cypress FX2 without EEPROM
  56          */
  57         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  58                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  59
  60         { 0, 0, 0, 0, 0, 0, 0 }
  61 };
  62
  63 static int hwcaps[] = {
  64         SR_HWCAP_LOGIC_ANALYZER,
  65         SR_HWCAP_SAMPLERATE,
  66
  67         /* These are really implemented in the driver, not the hardware. */
  68         SR_HWCAP_LIMIT_SAMPLES,
  69         SR_HWCAP_CONTINUOUS,
  70         0,
  71 };
  72
  73 /*
  74  * TODO: Different probe_names[] for each supported device.
  75  */
  76 static const char *probe_names[] = {
  77         "0",
  78         "1",
  79         "2",
  80         "3",
  81         "4",
  82         "5",
  83         "6",
  84         "7",
  85         NULL,
  86 };
  87
  88 static uint64_t supported_samplerates[] = {
  89         SR_KHZ(200),
  90         SR_KHZ(250),
  91         SR_KHZ(500),
  92         SR_MHZ(1),
  93         SR_MHZ(2),
  94         SR_MHZ(3),
  95         SR_MHZ(4),
  96         SR_MHZ(6),
  97         SR_MHZ(8),
  98         SR_MHZ(12),
  99         SR_MHZ(16),
 100         SR_MHZ(24),
 101         0,
 102 };
 103
 104 static struct sr_samplerates samplerates = {
 105         0,
 106         0,
 107         0,
 108         supported_samplerates,
 109 };
 110
 111 static GSList *dev_insts = NULL;
 112 static libusb_context *usb_context = NULL;
 113
 114 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 115 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 116
 117 /**
 118  * Check the USB configuration to determine if this is an fx2lafw device.
 119  *
 120  * @return TRUE if the device's configuration profile match fx2lafw
 121  *         configuration, FALSE otherwise.
 122  */
 123 static gboolean check_conf_profile(libusb_device *dev)
 124 {
 125         struct libusb_device_descriptor des;
 126         struct libusb_device_handle *hdl;
 127         gboolean ret;
 128         unsigned char strdesc[64];
 129
 130         hdl = NULL;
 131         ret = FALSE;
 132         while (!ret) {
 133                 /* Assume the FW has not been loaded, unless proven wrong. */
 134                 if (libusb_get_device_descriptor(dev, &des) != 0)
 135                         break;
 136
 137                 if (libusb_open(dev, &hdl) != 0)
 138                         break;
 139
 140                 if (libusb_get_string_descriptor_ascii(hdl,
 141                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 142                         break;
 143                 if (strncmp((const char *)strdesc, "sigrok", 6))
 144                         break;
 145
 146                 if (libusb_get_string_descriptor_ascii(hdl,
 147                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 148                         break;
 149                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 150                         break;
 151
 152                 /* If we made it here, it must be an fx2lafw. */
 153                 ret = TRUE;
 154         }
 155         if (hdl)
 156                 libusb_close(hdl);
 157
 158         return ret;
 159 }
 160
 161 static int fx2lafw_dev_open(int dev_index)
 162 {
 163         libusb_device **devlist;
 164         struct libusb_device_descriptor des;
 165         struct sr_dev_inst *sdi;
 166         struct context *ctx;
 167         struct version_info vi;
 168         int ret, skip, i;
 169
 170         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 171                 return SR_ERR;
 172         ctx = sdi->priv;
 173
 174         if (sdi->status == SR_ST_ACTIVE)
 175                 /* already in use */
 176                 return SR_ERR;
 177
 178         skip = 0;
 179         const int device_count = libusb_get_device_list(usb_context, &devlist);
 180         if (device_count < 0) {
 181                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 182                         device_count);
 183                 return SR_ERR;
 184         }
 185
 186         for (i = 0; i < device_count; i++) {
 187                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 188                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 189                                ret);
 190                         continue;
 191                 }
 192
 193                 if (des.idVendor != ctx->profile->vid
 194                     || des.idProduct != ctx->profile->pid)
 195                         continue;
 196
 197                 if (sdi->status == SR_ST_INITIALIZING) {
 198                         if (skip != dev_index) {
 199                                 /* Skip devices of this type that aren't the one we want. */
 200                                 skip += 1;
 201                                 continue;
 202                         }
 203                 } else if (sdi->status == SR_ST_INACTIVE) {
 204                         /*
 205                          * This device is fully enumerated, so we need to find
 206                          * this device by vendor, product, bus and address.
 207                          */
 208                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 209                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 210                                 /* this is not the one */
 211                                 continue;
 212                 }
 213
 214                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 215                         if (ctx->usb->address == 0xff)
 216                                 /*
 217                                  * first time we touch this device after firmware upload,
 218                                  * so we don't know the address yet.
 219                                  */
 220                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 221                 } else {
 222                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 223                         break;
 224                 }
 225
 226                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 227                 if (ret != SR_OK) {
 228                         sr_err("fx2lafw: Failed to retrieve "
 229                                "firmware version information.");
 230                         break;
 231                 }
 232
 233                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 234                     vi.minor != FX2LAFW_VERSION_MINOR) {
 235                         sr_err("fx2lafw: Expected firmware version %d.%02d "
 236                                "got %d.%02d.", FX2LAFW_VERSION_MAJOR,
 237                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 238                         break;
 239                 }
 240
 241                 sdi->status = SR_ST_ACTIVE;
 242                 sr_info("fx2lafw: Opened device %d on %d.%d "
 243                         "interface %d, firmware version %d.%02d",
 244                         sdi->index, ctx->usb->bus, ctx->usb->address,
 245                         USB_INTERFACE, vi.major, vi.minor);
 246
 247                 break;
 248         }
 249         libusb_free_device_list(devlist, 1);
 250
 251         if (sdi->status != SR_ST_ACTIVE)
 252                 return SR_ERR;
 253
 254         return SR_OK;
 255 }
 256
 257 static void close_dev(struct sr_dev_inst *sdi)
 258 {
 259         struct context *ctx;
 260
 261         ctx = sdi->priv;
 262
 263         if (ctx->usb->devhdl == NULL)
 264                 return;
 265
 266         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 267                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 268         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 269         libusb_close(ctx->usb->devhdl);
 270         ctx->usb->devhdl = NULL;
 271         sdi->status = SR_ST_INACTIVE;
 272 }
 273
 274 static int configure_probes(struct context *ctx, GSList *probes)
 275 {
 276         struct sr_probe *probe;
 277         GSList *l;
 278         int probe_bit, stage, i;
 279         char *tc;
 280
 281         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 282                 ctx->trigger_mask[i] = 0;
 283                 ctx->trigger_value[i] = 0;
 284         }
 285
 286         stage = -1;
 287         for (l = probes; l; l = l->next) {
 288                 probe = (struct sr_probe *)l->data;
 289                 if (probe->enabled == FALSE)
 290                         continue;
 291                 probe_bit = 1 << (probe->index - 1);
 292                 if (!(probe->trigger))
 293                         continue;
 294
 295                 stage = 0;
 296                 for (tc = probe->trigger; *tc; tc++) {
 297                         ctx->trigger_mask[stage] |= probe_bit;
 298                         if (*tc == '1')
 299                                 ctx->trigger_value[stage] |= probe_bit;
 300                         stage++;
 301                         if (stage > NUM_TRIGGER_STAGES)
 302                                 return SR_ERR;
 303                 }
 304         }
 305
 306         if (stage == -1)
 307                 /*
 308                  * We didn't configure any triggers, make sure acquisition
 309                  * doesn't wait for any.
 310                  */
 311                 ctx->trigger_stage = TRIGGER_FIRED;
 312         else
 313                 ctx->trigger_stage = 0;
 314
 315         return SR_OK;
 316 }
 317
 318 static struct context *fx2lafw_dev_new(void)
 319 {
 320         struct context *ctx;
 321
 322         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 323                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 324                 return NULL;
 325         }
 326
 327         ctx->trigger_stage = TRIGGER_FIRED;
 328
 329         return ctx;
 330 }
 331
 332 /*
 333  * API callbacks
 334  */
 335
 336 static int hw_init(const char *devinfo)
 337 {
 338         struct sr_dev_inst *sdi;
 339         struct libusb_device_descriptor des;
 340         const struct fx2lafw_profile *prof;
 341         struct context *ctx;
 342         libusb_device **devlist;
 343         int ret;
 344         int devcnt = 0;
 345         int i, j;
 346
 347         /* Avoid compiler warnings. */
 348         (void)devinfo;
 349
 350         if (libusb_init(&usb_context) != 0) {
 351                 sr_warn("fx2lafw: Failed to initialize libusb.");
 352                 return 0;
 353         }
 354
 355         /* Find all fx2lafw compatible devices and upload firware to them. */
 356         libusb_get_device_list(usb_context, &devlist);
 357         for (i = 0; devlist[i]; i++) {
 358
 359                 if ((ret = libusb_get_device_descriptor(
 360                      devlist[i], &des)) != 0) {
 361                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 362                         continue;
 363                 }
 364
 365                 prof = NULL;
 366                 for (j = 0; supported_fx2[j].vid; j++) {
 367                         if (des.idVendor == supported_fx2[j].vid &&
 368                                 des.idProduct == supported_fx2[j].pid) {
 369                                 prof = &supported_fx2[j];
 370                         }
 371                 }
 372
 373                 /* Skip if the device was not found */
 374                 if (!prof)
 375                         continue;
 376
 377                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 378                         prof->vendor, prof->model, prof->model_version);
 379                 if (!sdi)
 380                         return 0;
 381
 382                 ctx = fx2lafw_dev_new();
 383                 ctx->profile = prof;
 384                 sdi->priv = ctx;
 385                 dev_insts = g_slist_append(dev_insts, sdi);
 386
 387                 if (check_conf_profile(devlist[i])) {
 388                         /* Already has the firmware, so fix the new address. */
 389                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 390                         sdi->status = SR_ST_INACTIVE;
 391                         ctx->usb = sr_usb_dev_inst_new
 392                             (libusb_get_bus_number(devlist[i]),
 393                              libusb_get_device_address(devlist[i]), NULL);
 394                 } else {
 395                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 396                                 prof->firmware) == SR_OK)
 397                                 /* Remember when the firmware on this device was updated */
 398                                 g_get_current_time(&ctx->fw_updated);
 399                         else
 400                                 sr_err("fx2lafw: Firmware upload failed for "
 401                                        "device %d.", devcnt);
 402                         ctx->usb = sr_usb_dev_inst_new
 403                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 404                 }
 405
 406                 devcnt++;
 407         }
 408         libusb_free_device_list(devlist, 1);
 409
 410         return devcnt;
 411 }
 412
 413 static int hw_dev_open(int dev_index)
 414 {
 415         GTimeVal cur_time;
 416         struct sr_dev_inst *sdi;
 417         struct context *ctx;
 418         int timediff, ret;
 419
 420         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 421                 return SR_ERR;
 422         ctx = sdi->priv;
 423
 424         /*
 425          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 426          * for the FX2 to renumerate.
 427          */
 428         ret = 0;
 429         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 430                 sr_info("fx2lafw: Waiting for device to reset.");
 431                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 432                 g_usleep(300 * 1000);
 433                 timediff = 0;
 434                 while (timediff < MAX_RENUM_DELAY) {
 435                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 436                                 break;
 437                         g_usleep(100 * 1000);
 438                         g_get_current_time(&cur_time);
 439                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 440                 }
 441                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 442         } else {
 443                 ret = fx2lafw_dev_open(dev_index);
 444         }
 445
 446         if (ret != SR_OK) {
 447                 sr_err("fx2lafw: Unable to open device.");
 448                 return SR_ERR;
 449         }
 450         ctx = sdi->priv;
 451
 452         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 453         if (ret != 0) {
 454                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 455                 return SR_ERR;
 456         }
 457
 458         if (ctx->cur_samplerate == 0) {
 459                 /* Samplerate hasn't been set; default to the slowest one. */
 460                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 461                     &supported_samplerates[0]) == SR_ERR)
 462                         return SR_ERR;
 463         }
 464
 465         return SR_OK;
 466 }
 467
 468 static int hw_dev_close(int dev_index)
 469 {
 470         struct sr_dev_inst *sdi;
 471
 472         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 473                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 474                 return SR_ERR_BUG;
 475         }
 476
 477         /* TODO */
 478         close_dev(sdi);
 479
 480         return SR_OK;
 481 }
 482
 483 static int hw_cleanup(void)
 484 {
 485         GSList *l;
 486         struct sr_dev_inst *sdi;
 487         struct context *ctx;
 488         int ret = SR_OK;
 489
 490         for (l = dev_insts; l; l = l->next) {
 491                 if (!(sdi = l->data)) {
 492                         /* Log error, but continue cleaning up the rest. */
 493                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 494                                __func__);
 495                         ret = SR_ERR_BUG;
 496                         continue;
 497                 }
 498                 if (!(ctx = sdi->priv)) {
 499                         /* Log error, but continue cleaning up the rest. */
 500                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 501                                __func__);
 502                         ret = SR_ERR_BUG;
 503                         continue;
 504                 }
 505                 close_dev(sdi);
 506                 sdi = l->data;
 507                 sr_dev_inst_free(sdi);
 508         }
 509
 510         g_slist_free(dev_insts);
 511         dev_insts = NULL;
 512
 513         if (usb_context)
 514                 libusb_exit(usb_context);
 515         usb_context = NULL;
 516
 517         return ret;
 518 }
 519
 520 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 521 {
 522         struct sr_dev_inst *sdi;
 523         struct context *ctx;
 524
 525         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 526                 return NULL;
 527         ctx = sdi->priv;
 528
 529         switch (dev_info_id) {
 530         case SR_DI_INST:
 531                 return sdi;
 532         case SR_DI_NUM_PROBES:
 533                 return GINT_TO_POINTER(ctx->profile->num_probes);
 534         case SR_DI_PROBE_NAMES:
 535                 return probe_names;
 536         case SR_DI_SAMPLERATES:
 537                 return &samplerates;
 538         case SR_DI_TRIGGER_TYPES:
 539                 return TRIGGER_TYPES;
 540         case SR_DI_CUR_SAMPLERATE:
 541                 return &ctx->cur_samplerate;
 542         }
 543
 544         return NULL;
 545 }
 546
 547 static int hw_dev_status_get(int dev_index)
 548 {
 549         const struct sr_dev_inst *const sdi =
 550                 sr_dev_inst_get(dev_insts, dev_index);
 551
 552         if (!sdi)
 553                 return SR_ST_NOT_FOUND;
 554
 555         return sdi->status;
 556 }
 557
 558 static int *hw_hwcap_get_all(void)
 559 {
 560         return hwcaps;
 561 }
 562
 563 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 564 {
 565         struct sr_dev_inst *sdi;
 566         struct context *ctx;
 567         int ret;
 568
 569         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 570                 return SR_ERR;
 571         ctx = sdi->priv;
 572
 573         if (hwcap == SR_HWCAP_SAMPLERATE) {
 574                 ctx->cur_samplerate = *(uint64_t *)value;
 575                 ret = SR_OK;
 576         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 577                 ret = configure_probes(ctx, (GSList *) value);
 578         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 579                 ctx->limit_samples = *(uint64_t *)value;
 580                 ret = SR_OK;
 581         } else {
 582                 ret = SR_ERR;
 583         }
 584
 585         return ret;
 586 }
 587
 588 static int receive_data(int fd, int revents, void *cb_data)
 589 {
 590         struct timeval tv;
 591
 592         /* Avoid compiler warnings. */
 593         (void)fd;
 594         (void)revents;
 595         (void)cb_data;
 596
 597         tv.tv_sec = tv.tv_usec = 0;
 598         libusb_handle_events_timeout(usb_context, &tv);
 599
 600         return TRUE;
 601 }
 602
 603 static void abort_acquisition(struct context *ctx)
 604 {
 605         ctx->num_samples = -1;
 606 }
 607
 608 static void finish_acquisition(struct context *ctx)
 609 {
 610         struct sr_datafeed_packet packet;
 611         int i;
 612
 613         /* Terminate session */
 614         packet.type = SR_DF_END;
 615         sr_session_send(ctx->session_dev_id, &packet);
 616
 617         /* Remove fds from polling */
 618         const struct libusb_pollfd **const lupfd =
 619                 libusb_get_pollfds(usb_context);
 620         for (i = 0; lupfd[i]; i++)
 621                 sr_source_remove(lupfd[i]->fd);
 622         free(lupfd); /* NOT g_free()! */
 623 }
 624
 625 static void receive_transfer(struct libusb_transfer *transfer)
 626 {
 627         /* TODO: These statics have to move to the ctx struct. */
 628         static int empty_transfer_count = 0;
 629         struct sr_datafeed_packet packet;
 630         struct sr_datafeed_logic logic;
 631         struct context *ctx = transfer->user_data;
 632         int cur_buflen, trigger_offset, i;
 633         unsigned char *cur_buf, *new_buf;
 634
 635         /*
 636          * If acquisition has already ended, just free any queued up
 637          * transfer that come in.
 638          */
 639         if (ctx->num_samples == -1) {
 640                 if (transfer)
 641                         libusb_free_transfer(transfer);
 642
 643                 ctx->submitted_transfers--;
 644                 if (ctx->submitted_transfers == 0)
 645                         finish_acquisition(ctx);
 646
 647                 return;
 648         }
 649
 650         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 651                 transfer->status, transfer->actual_length);
 652
 653         /* Save incoming transfer before reusing the transfer struct. */
 654         cur_buf = transfer->buffer;
 655         cur_buflen = transfer->actual_length;
 656
 657         /* Fire off a new request. */
 658         if (!(new_buf = g_try_malloc(4096))) {
 659                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 660                 return; /* TODO: SR_ERR_MALLOC */
 661         }
 662
 663         transfer->buffer = new_buf;
 664         transfer->length = 4096;
 665         if (libusb_submit_transfer(transfer) != 0) {
 666                 /* TODO: Stop session? */
 667                 /* TODO: Better error message. */
 668                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 669         }
 670
 671         if (cur_buflen == 0) {
 672                 empty_transfer_count++;
 673                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 674                         /*
 675                          * The FX2 gave up. End the acquisition, the frontend
 676                          * will work out that the samplecount is short.
 677                          */
 678                         abort_acquisition(ctx);
 679                 }
 680                 return;
 681         } else {
 682                 empty_transfer_count = 0;
 683         }
 684
 685         trigger_offset = 0;
 686         if (ctx->trigger_stage >= 0) {
 687                 for (i = 0; i < cur_buflen; i++) {
 688
 689                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 690                                 /* Match on this trigger stage. */
 691                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 692                                 ctx->trigger_stage++;
 693
 694                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 695                                         /* Match on all trigger stages, we're done. */
 696                                         trigger_offset = i + 1;
 697
 698                                         /*
 699                                          * TODO: Send pre-trigger buffer to session bus.
 700                                          * Tell the frontend we hit the trigger here.
 701                                          */
 702                                         packet.type = SR_DF_TRIGGER;
 703                                         packet.payload = NULL;
 704                                         sr_session_send(ctx->session_dev_id, &packet);
 705
 706                                         /*
 707                                          * Send the samples that triggered it, since we're
 708                                          * skipping past them.
 709                                          */
 710                                         packet.type = SR_DF_LOGIC;
 711                                         packet.payload = &logic;
 712                                         logic.length = ctx->trigger_stage;
 713                                         logic.unitsize = 1;
 714                                         logic.data = ctx->trigger_buffer;
 715                                         sr_session_send(ctx->session_dev_id, &packet);
 716
 717                                         ctx->trigger_stage = TRIGGER_FIRED;
 718                                         break;
 719                                 }
 720                                 return;
 721                         }
 722
 723                         /*
 724                          * We had a match before, but not in the next sample. However, we may
 725                          * have a match on this stage in the next bit -- trigger on 0001 will
 726                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 727                          * the next sample from the one that matched originally, which the
 728                          * counter increment at the end of the loop takes care of.
 729                          */
 730                         if (ctx->trigger_stage > 0) {
 731                                 i -= ctx->trigger_stage;
 732                                 if (i < -1)
 733                                         i = -1; /* Oops, went back past this buffer. */
 734                                 /* Reset trigger stage. */
 735                                 ctx->trigger_stage = 0;
 736                         }
 737                 }
 738         }
 739
 740         if (ctx->trigger_stage == TRIGGER_FIRED) {
 741                 /* Send the incoming transfer to the session bus. */
 742                 packet.type = SR_DF_LOGIC;
 743                 packet.payload = &logic;
 744                 logic.length = cur_buflen - trigger_offset;
 745                 logic.unitsize = 1;
 746                 logic.data = cur_buf + trigger_offset;
 747                 sr_session_send(ctx->session_dev_id, &packet);
 748                 g_free(cur_buf);
 749
 750                 ctx->num_samples += cur_buflen;
 751                 if (ctx->limit_samples &&
 752                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 753                         abort_acquisition(ctx);
 754                 }
 755         } else {
 756                 /*
 757                  * TODO: Buffer pre-trigger data in capture
 758                  * ratio-sized buffer.
 759                  */
 760         }
 761 }
 762
 763 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 764 {
 765         struct sr_dev_inst *sdi;
 766         struct sr_datafeed_packet *packet;
 767         struct sr_datafeed_header *header;
 768         struct context *ctx;
 769         struct libusb_transfer *transfer;
 770         const struct libusb_pollfd **lupfd;
 771         int ret, size, i;
 772         unsigned char *buf;
 773
 774         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 775                 return SR_ERR;
 776         ctx = sdi->priv;
 777         ctx->session_dev_id = cb_data;
 778         ctx->num_samples = 0;
 779
 780         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 781                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 782                 return SR_ERR_MALLOC;
 783         }
 784
 785         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 786                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 787                 return SR_ERR_MALLOC;
 788         }
 789
 790         /* Start with 2K transfer, subsequently increased to 4K. */
 791         size = 2048;
 792         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 793                 if (!(buf = g_try_malloc(size))) {
 794                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 795                         return SR_ERR_MALLOC;
 796                 }
 797                 transfer = libusb_alloc_transfer(0);
 798                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 799                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 800                                 receive_transfer, ctx, 40);
 801                 if (libusb_submit_transfer(transfer) != 0) {
 802                         /* TODO: Free them all. */
 803                         libusb_free_transfer(transfer);
 804                         g_free(buf);
 805                         return SR_ERR;
 806                 }
 807
 808                 ctx->submitted_transfers++;
 809                 size = 4096;
 810         }
 811
 812         lupfd = libusb_get_pollfds(usb_context);
 813         for (i = 0; lupfd[i]; i++)
 814                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 815                               40, receive_data, NULL);
 816         free(lupfd); /* NOT g_free()! */
 817
 818         packet->type = SR_DF_HEADER;
 819         packet->payload = header;
 820         header->feed_version = 1;
 821         gettimeofday(&header->starttime, NULL);
 822         header->samplerate = ctx->cur_samplerate;
 823         header->num_logic_probes = ctx->profile->num_probes;
 824         sr_session_send(cb_data, packet);
 825         g_free(header);
 826         g_free(packet);
 827
 828         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 829                 ctx->cur_samplerate)) != SR_OK) {
 830                 return ret;
 831         }
 832
 833         return SR_OK;
 834 }
 835
 836 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 837 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 838 {
 839         struct sr_dev_inst *sdi;
 840
 841         /* Avoid compiler warnings. */
 842         (void)cb_data;
 843
 844         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 845                 return SR_ERR;
 846
 847         abort_acquisition(sdi->priv);
 848
 849         return SR_OK;
 850 }
 851
 852 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 853         .name = "fx2lafw",
 854         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 855         .api_version = 1,
 856         .init = hw_init,
 857         .cleanup = hw_cleanup,
 858         .dev_open = hw_dev_open,
 859         .dev_close = hw_dev_close,
 860         .dev_info_get = hw_dev_info_get,
 861         .dev_status_get = hw_dev_status_get,
 862         .hwcap_get_all = hw_hwcap_get_all,
 863         .dev_config_set = hw_dev_config_set,
 864         .dev_acquisition_start = hw_dev_acquisition_start,
 865         .dev_acquisition_stop = hw_dev_acquisition_stop,
 866 };