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_MHZ(1),
  83         SR_MHZ(2),
  84         SR_MHZ(3),
  85         SR_MHZ(4),
  86         SR_MHZ(6),
  87         SR_MHZ(8),
  88         SR_MHZ(12),
  89         SR_MHZ(16),
  90         SR_MHZ(24),
  91 };
  92
  93 static struct sr_samplerates samplerates = {
  94         0,
  95         0,
  96         0,
  97         supported_samplerates,
  98 };
  99
 100 static GSList *dev_insts = NULL;
 101 static libusb_context *usb_context = NULL;
 102
 103 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 104 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 105
 106 /**
 107  * Check the USB configuration to determine if this is an fx2lafw device.
 108  *
 109  * @return TRUE if the device's configuration profile match fx2lafw
 110  *         configuration, FALSE otherwise.
 111  */
 112 static gboolean check_conf_profile(libusb_device *dev)
 113 {
 114         struct libusb_device_descriptor des;
 115         struct libusb_config_descriptor *conf_dsc = NULL;
 116         const struct libusb_interface_descriptor *intf_dsc;
 117         gboolean ret = FALSE;
 118
 119         while (!ret) {
 120                 /* Assume the FW has not been loaded, unless proven wrong. */
 121                 ret = FALSE;
 122
 123                 if (libusb_get_device_descriptor(dev, &des) != 0)
 124                         break;
 125
 126                 /* Need exactly 1 configuration. */
 127                 if (des.bNumConfigurations != 1)
 128                         break;
 129
 130                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 131                         break;
 132
 133                 /* Need exactly 1 interface. */
 134                 if (conf_dsc->bNumInterfaces != 1)
 135                         break;
 136
 137                 /* Need just one alternate setting. */
 138                 if (conf_dsc->interface[0].num_altsetting != 1)
 139                         break;
 140
 141                 /* Need exactly 2 endpoints. */
 142                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 143                 if (intf_dsc->bNumEndpoints != 2)
 144                         break;
 145
 146                 /* The first endpoint should be 2 (inbound). */
 147                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 148                     (2 | LIBUSB_ENDPOINT_IN))
 149                         break;
 150
 151                 /* If we made it here, it must be an fx2lafw. */
 152                 ret = TRUE;
 153         }
 154
 155         if (conf_dsc)
 156                 libusb_free_config_descriptor(conf_dsc);
 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                 if((ret = command_get_fw_version(ctx->usb->devhdl, &vi)) != SR_OK) {
 227                         sr_err("fx2lafw: Failed to retrieve "
 228                                 "firmware version information");
 229                         break;
 230                 }
 231
 232                 if(vi.major != FX2LAFW_VERSION_MAJOR ||
 233                         vi.minor != FX2LAFW_VERSION_MINOR) {
 234                         sr_err("fx2lafw: Expected firmware version %d.%02d "
 235                                 "got %d.%02d", FX2LAFW_VERSION_MAJOR,
 236                                 FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 237                         break;
 238                 }
 239
 240                 sdi->status = SR_ST_ACTIVE;
 241                 sr_info("fx2lafw: Opened device %d on %d.%d "
 242                         "interface %d, firmware version %d.%02d",
 243                         sdi->index, ctx->usb->bus, ctx->usb->address,
 244                         USB_INTERFACE, vi.major, vi.minor);
 245
 246                 break;
 247         }
 248         libusb_free_device_list(devlist, 1);
 249
 250         if (sdi->status != SR_ST_ACTIVE)
 251                 return SR_ERR;
 252
 253         return SR_OK;
 254 }
 255
 256 static void close_dev(struct sr_dev_inst *sdi)
 257 {
 258         struct context *ctx;
 259
 260         ctx = sdi->priv;
 261
 262         if (ctx->usb->devhdl == NULL)
 263                 return;
 264
 265         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 266                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 267         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 268         libusb_close(ctx->usb->devhdl);
 269         ctx->usb->devhdl = NULL;
 270         sdi->status = SR_ST_INACTIVE;
 271 }
 272
 273 static int configure_probes(struct context *ctx, GSList *probes)
 274 {
 275         struct sr_probe *probe;
 276         GSList *l;
 277         int probe_bit, stage, i;
 278         char *tc;
 279
 280         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 281                 ctx->trigger_mask[i] = 0;
 282                 ctx->trigger_value[i] = 0;
 283         }
 284
 285         stage = -1;
 286         for (l = probes; l; l = l->next) {
 287                 probe = (struct sr_probe *)l->data;
 288                 if (probe->enabled == FALSE)
 289                         continue;
 290                 probe_bit = 1 << (probe->index - 1);
 291                 if (!(probe->trigger))
 292                         continue;
 293
 294                 stage = 0;
 295                 for (tc = probe->trigger; *tc; tc++) {
 296                         ctx->trigger_mask[stage] |= probe_bit;
 297                         if (*tc == '1')
 298                                 ctx->trigger_value[stage] |= probe_bit;
 299                         stage++;
 300                         if (stage > NUM_TRIGGER_STAGES)
 301                                 return SR_ERR;
 302                 }
 303         }
 304
 305         if (stage == -1)
 306                 /*
 307                  * We didn't configure any triggers, make sure acquisition
 308                  * doesn't wait for any.
 309                  */
 310                 ctx->trigger_stage = TRIGGER_FIRED;
 311         else
 312                 ctx->trigger_stage = 0;
 313
 314         return SR_OK;
 315 }
 316
 317 static struct context *fx2lafw_dev_new(void)
 318 {
 319         struct context *ctx;
 320
 321         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 322                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 323                 return NULL;
 324         }
 325
 326         ctx->trigger_stage = TRIGGER_FIRED;
 327
 328         return ctx;
 329 }
 330
 331 /*
 332  * API callbacks
 333  */
 334
 335 static int hw_init(const char *devinfo)
 336 {
 337         struct sr_dev_inst *sdi;
 338         struct libusb_device_descriptor des;
 339         const struct fx2lafw_profile *prof;
 340         struct context *ctx;
 341         libusb_device **devlist;
 342         int ret;
 343         int devcnt = 0;
 344         int i, j;
 345
 346         /* Avoid compiler warnings. */
 347         (void)devinfo;
 348
 349         if (libusb_init(&usb_context) != 0) {
 350                 sr_warn("fx2lafw: Failed to initialize libusb.");
 351                 return 0;
 352         }
 353
 354         /* Find all fx2lafw compatible devices and upload firware to them. */
 355         libusb_get_device_list(usb_context, &devlist);
 356         for (i = 0; devlist[i]; i++) {
 357
 358                 if ((ret = libusb_get_device_descriptor(
 359                      devlist[i], &des)) != 0) {
 360                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 361                         continue;
 362                 }
 363
 364                 prof = NULL;
 365                 for (j = 0; supported_fx2[j].vid; j++) {
 366                         if (des.idVendor == supported_fx2[j].vid &&
 367                                 des.idProduct == supported_fx2[j].pid) {
 368                                 prof = &supported_fx2[j];
 369                         }
 370                 }
 371
 372                 /* Skip if the device was not found */
 373                 if (!prof)
 374                         continue;
 375
 376                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 377                         prof->vendor, prof->model, prof->model_version);
 378                 if (!sdi)
 379                         return 0;
 380
 381                 ctx = fx2lafw_dev_new();
 382                 ctx->profile = prof;
 383                 sdi->priv = ctx;
 384                 dev_insts = g_slist_append(dev_insts, sdi);
 385
 386                 if (check_conf_profile(devlist[i])) {
 387                         /* Already has the firmware, so fix the new address. */
 388                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 389                         sdi->status = SR_ST_INACTIVE;
 390                         ctx->usb = sr_usb_dev_inst_new
 391                             (libusb_get_bus_number(devlist[i]),
 392                              libusb_get_device_address(devlist[i]), NULL);
 393                 } else {
 394                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 395                                 prof->firmware) == SR_OK)
 396                                 /* Remember when the firmware on this device was updated */
 397                                 g_get_current_time(&ctx->fw_updated);
 398                         else
 399                                 sr_err("fx2lafw: Firmware upload failed for "
 400                                        "device %d.", devcnt);
 401                         ctx->usb = sr_usb_dev_inst_new
 402                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 403                 }
 404
 405                 devcnt++;
 406         }
 407         libusb_free_device_list(devlist, 1);
 408
 409         return devcnt;
 410 }
 411
 412 static int hw_dev_open(int dev_index)
 413 {
 414         GTimeVal cur_time;
 415         struct sr_dev_inst *sdi;
 416         struct context *ctx;
 417         int timediff, ret;
 418
 419         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 420                 return SR_ERR;
 421         ctx = sdi->priv;
 422
 423         /*
 424          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 425          * for the FX2 to renumerate
 426          */
 427         ret = 0;
 428         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 429                 sr_info("fx2lafw: Waiting for device to reset.");
 430                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 431                 g_usleep(300 * 1000);
 432                 timediff = 0;
 433                 while (timediff < MAX_RENUM_DELAY) {
 434                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 435                                 break;
 436                         g_usleep(100 * 1000);
 437                         g_get_current_time(&cur_time);
 438                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 439                 }
 440                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 441         } else {
 442                 ret = fx2lafw_dev_open(dev_index);
 443         }
 444
 445         if (ret != SR_OK) {
 446                 sr_err("fx2lafw: Unable to open device.");
 447                 return SR_ERR;
 448         }
 449         ctx = sdi->priv;
 450
 451         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 452         if (ret != 0) {
 453                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 454                 return SR_ERR;
 455         }
 456
 457         if (ctx->cur_samplerate == 0) {
 458                 /* Samplerate hasn't been set; default to the slowest one. */
 459                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 460                     &supported_samplerates[0]) == SR_ERR)
 461                         return SR_ERR;
 462         }
 463
 464         return SR_OK;
 465 }
 466
 467 static int hw_dev_close(int dev_index)
 468 {
 469         struct sr_dev_inst *sdi;
 470
 471         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 472                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 473                 return SR_ERR_BUG;
 474         }
 475
 476         /* TODO */
 477         close_dev(sdi);
 478
 479         return SR_OK;
 480 }
 481
 482 static int hw_cleanup(void)
 483 {
 484         GSList *l;
 485         struct sr_dev_inst *sdi;
 486         struct context *ctx;
 487         int ret = SR_OK;
 488
 489         for (l = dev_insts; l; l = l->next) {
 490                 if (!(sdi = l->data)) {
 491                         /* Log error, but continue cleaning up the rest. */
 492                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 493                                __func__);
 494                         ret = SR_ERR_BUG;
 495                         continue;
 496                 }
 497                 if (!(ctx = sdi->priv)) {
 498                         /* Log error, but continue cleaning up the rest. */
 499                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 500                                __func__);
 501                         ret = SR_ERR_BUG;
 502                         continue;
 503                 }
 504                 close_dev(sdi);
 505                 sdi = l->data;
 506                 sr_dev_inst_free(sdi);
 507         }
 508
 509         g_slist_free(dev_insts);
 510         dev_insts = NULL;
 511
 512         if (usb_context)
 513                 libusb_exit(usb_context);
 514         usb_context = NULL;
 515
 516         return ret;
 517 }
 518
 519 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 520 {
 521         struct sr_dev_inst *sdi;
 522         struct context *ctx;
 523
 524         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 525                 return NULL;
 526         ctx = sdi->priv;
 527
 528         switch (dev_info_id) {
 529         case SR_DI_INST:
 530                 return sdi;
 531         case SR_DI_NUM_PROBES:
 532                 return GINT_TO_POINTER(ctx->profile->num_probes);
 533         case SR_DI_PROBE_NAMES:
 534                 return probe_names;
 535         case SR_DI_SAMPLERATES:
 536                 return &samplerates;
 537         case SR_DI_TRIGGER_TYPES:
 538                 return TRIGGER_TYPES;
 539         case SR_DI_CUR_SAMPLERATE:
 540                 return &ctx->cur_samplerate;
 541         }
 542
 543         return NULL;
 544 }
 545
 546 static int hw_dev_status_get(int dev_index)
 547 {
 548         const struct sr_dev_inst *const sdi =
 549                 sr_dev_inst_get(dev_insts, dev_index);
 550
 551         if (!sdi)
 552                 return SR_ST_NOT_FOUND;
 553
 554         return sdi->status;
 555 }
 556
 557 static int *hw_hwcap_get_all(void)
 558 {
 559         return hwcaps;
 560 }
 561
 562 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 563 {
 564         struct sr_dev_inst *sdi;
 565         struct context *ctx;
 566         int ret;
 567
 568         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 569                 return SR_ERR;
 570         ctx = sdi->priv;
 571
 572         if (hwcap == SR_HWCAP_SAMPLERATE) {
 573                 ctx->cur_samplerate = *(uint64_t *)value;
 574                 ret = SR_OK;
 575         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 576                 ret = configure_probes(ctx, (GSList *) value);
 577         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 578                 ctx->limit_samples = *(uint64_t *)value;
 579                 ret = SR_OK;
 580         } else {
 581                 ret = SR_ERR;
 582         }
 583
 584         return ret;
 585 }
 586
 587 static int receive_data(int fd, int revents, void *cb_data)
 588 {
 589         struct timeval tv;
 590
 591         /* Avoid compiler warnings. */
 592         (void)fd;
 593         (void)revents;
 594         (void)cb_data;
 595
 596         tv.tv_sec = tv.tv_usec = 0;
 597         libusb_handle_events_timeout(usb_context, &tv);
 598
 599         return TRUE;
 600 }
 601
 602 static void abort_acquisition(struct context *ctx)
 603 {
 604         ctx->num_samples = -1;
 605 }
 606
 607 static void finish_acquisition(struct context *ctx)
 608 {
 609         struct sr_datafeed_packet packet;
 610         int i;
 611
 612         /* Terminate session */
 613         packet.type = SR_DF_END;
 614         sr_session_send(ctx->session_dev_id, &packet);
 615
 616         /* Remove fds from polling */
 617         const struct libusb_pollfd **const lupfd =
 618                 libusb_get_pollfds(usb_context);
 619         for (i = 0; lupfd[i]; i++)
 620                 sr_source_remove(lupfd[i]->fd);
 621         free(lupfd); /* NOT g_free()! */
 622 }
 623
 624 static void receive_transfer(struct libusb_transfer *transfer)
 625 {
 626         /* TODO: These statics have to move to the ctx struct. */
 627         static int empty_transfer_count = 0;
 628         struct sr_datafeed_packet packet;
 629         struct sr_datafeed_logic logic;
 630         struct context *ctx = transfer->user_data;
 631         int cur_buflen, trigger_offset, i;
 632         unsigned char *cur_buf, *new_buf;
 633
 634         /*
 635          * If acquisition has already ended, just free any queued up
 636          * transfer that come in.
 637          */
 638         if (ctx->num_samples == -1) {
 639                 if (transfer)
 640                         libusb_free_transfer(transfer);
 641
 642                 ctx->submitted_transfers--;
 643                 if (ctx->submitted_transfers == 0)
 644                         finish_acquisition(ctx);
 645
 646                 return;
 647         }
 648
 649         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 650                 transfer->status, transfer->actual_length);
 651
 652         /* Save incoming transfer before reusing the transfer struct. */
 653         cur_buf = transfer->buffer;
 654         cur_buflen = transfer->actual_length;
 655
 656         /* Fire off a new request. */
 657         if (!(new_buf = g_try_malloc(4096))) {
 658                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 659                 return; /* TODO: SR_ERR_MALLOC */
 660         }
 661
 662         transfer->buffer = new_buf;
 663         transfer->length = 4096;
 664         if (libusb_submit_transfer(transfer) != 0) {
 665                 /* TODO: Stop session? */
 666                 /* TODO: Better error message. */
 667                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 668         }
 669
 670         if (cur_buflen == 0) {
 671                 empty_transfer_count++;
 672                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 673                         /*
 674                          * The FX2 gave up. End the acquisition, the frontend
 675                          * will work out that the samplecount is short.
 676                          */
 677                         abort_acquisition(ctx);
 678                 }
 679                 return;
 680         } else {
 681                 empty_transfer_count = 0;
 682         }
 683
 684         trigger_offset = 0;
 685         if (ctx->trigger_stage >= 0) {
 686                 for (i = 0; i < cur_buflen; i++) {
 687
 688                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 689                                 /* Match on this trigger stage. */
 690                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 691                                 ctx->trigger_stage++;
 692
 693                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 694                                         /* Match on all trigger stages, we're done. */
 695                                         trigger_offset = i + 1;
 696
 697                                         /*
 698                                          * TODO: Send pre-trigger buffer to session bus.
 699                                          * Tell the frontend we hit the trigger here.
 700                                          */
 701                                         packet.type = SR_DF_TRIGGER;
 702                                         packet.payload = NULL;
 703                                         sr_session_send(ctx->session_dev_id, &packet);
 704
 705                                         /*
 706                                          * Send the samples that triggered it, since we're
 707                                          * skipping past them.
 708                                          */
 709                                         packet.type = SR_DF_LOGIC;
 710                                         packet.payload = &logic;
 711                                         logic.length = ctx->trigger_stage;
 712                                         logic.unitsize = 1;
 713                                         logic.data = ctx->trigger_buffer;
 714                                         sr_session_send(ctx->session_dev_id, &packet);
 715
 716                                         ctx->trigger_stage = TRIGGER_FIRED;
 717                                         break;
 718                                 }
 719                                 return;
 720                         }
 721
 722                         /*
 723                          * We had a match before, but not in the next sample. However, we may
 724                          * have a match on this stage in the next bit -- trigger on 0001 will
 725                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 726                          * the next sample from the one that matched originally, which the
 727                          * counter increment at the end of the loop takes care of.
 728                          */
 729                         if (ctx->trigger_stage > 0) {
 730                                 i -= ctx->trigger_stage;
 731                                 if (i < -1)
 732                                         i = -1; /* Oops, went back past this buffer. */
 733                                 /* Reset trigger stage. */
 734                                 ctx->trigger_stage = 0;
 735                         }
 736                 }
 737         }
 738
 739         if (ctx->trigger_stage == TRIGGER_FIRED) {
 740                 /* Send the incoming transfer to the session bus. */
 741                 packet.type = SR_DF_LOGIC;
 742                 packet.payload = &logic;
 743                 logic.length = cur_buflen - trigger_offset;
 744                 logic.unitsize = 1;
 745                 logic.data = cur_buf + trigger_offset;
 746                 sr_session_send(ctx->session_dev_id, &packet);
 747                 g_free(cur_buf);
 748
 749                 ctx->num_samples += cur_buflen;
 750                 if (ctx->limit_samples &&
 751                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 752                         abort_acquisition(ctx);
 753                 }
 754         } else {
 755                 /*
 756                  * TODO: Buffer pre-trigger data in capture
 757                  * ratio-sized buffer.
 758                  */
 759         }
 760 }
 761
 762 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 763 {
 764         struct sr_dev_inst *sdi;
 765         struct sr_datafeed_packet *packet;
 766         struct sr_datafeed_header *header;
 767         struct context *ctx;
 768         struct libusb_transfer *transfer;
 769         const struct libusb_pollfd **lupfd;
 770         int ret, size, i;
 771         unsigned char *buf;
 772
 773         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 774                 return SR_ERR;
 775         ctx = sdi->priv;
 776         ctx->session_dev_id = cb_data;
 777         ctx->num_samples = 0;
 778
 779         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 780                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 781                 return SR_ERR_MALLOC;
 782         }
 783
 784         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 785                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 786                 return SR_ERR_MALLOC;
 787         }
 788
 789         /* Start with 2K transfer, subsequently increased to 4K. */
 790         size = 2048;
 791         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 792                 if (!(buf = g_try_malloc(size))) {
 793                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 794                         return SR_ERR_MALLOC;
 795                 }
 796                 transfer = libusb_alloc_transfer(0);
 797                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 798                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 799                                 receive_transfer, ctx, 40);
 800                 if (libusb_submit_transfer(transfer) != 0) {
 801                         /* TODO: Free them all. */
 802                         libusb_free_transfer(transfer);
 803                         g_free(buf);
 804                         return SR_ERR;
 805                 }
 806
 807                 ctx->submitted_transfers++;
 808                 size = 4096;
 809         }
 810
 811         lupfd = libusb_get_pollfds(usb_context);
 812         for (i = 0; lupfd[i]; i++)
 813                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 814                               40, receive_data, NULL);
 815         free(lupfd); /* NOT g_free()! */
 816
 817         packet->type = SR_DF_HEADER;
 818         packet->payload = header;
 819         header->feed_version = 1;
 820         gettimeofday(&header->starttime, NULL);
 821         header->samplerate = ctx->cur_samplerate;
 822         header->num_logic_probes = ctx->profile->num_probes;
 823         sr_session_send(cb_data, packet);
 824         g_free(header);
 825         g_free(packet);
 826
 827         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 828                 ctx->cur_samplerate)) != SR_OK) {
 829                 return ret;
 830         }
 831
 832         return SR_OK;
 833 }
 834
 835 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 836 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 837 {
 838         struct sr_dev_inst *sdi;
 839
 840         /* Avoid compiler warnings. */
 841         (void)cb_data;
 842
 843         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 844                 return SR_ERR;
 845
 846         abort_acquisition(sdi->priv);
 847
 848         return SR_OK;
 849 }
 850
 851 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 852         .name = "fx2lafw",
 853         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 854         .api_version = 1,
 855         .init = hw_init,
 856         .cleanup = hw_cleanup,
 857         .dev_open = hw_dev_open,
 858         .dev_close = hw_dev_close,
 859         .dev_info_get = hw_dev_info_get,
 860         .dev_status_get = hw_dev_status_get,
 861         .hwcap_get_all = hw_hwcap_get_all,
 862         .dev_config_set = hw_dev_config_set,
 863         .dev_acquisition_start = hw_dev_acquisition_start,
 864         .dev_acquisition_stop = hw_dev_acquisition_stop,
 865 };