hardware/fx2lafw/fx2lafw.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <inttypes.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          * ARMFLY AX-Pro
  37          */
  38         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  39                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  40
  41         /*
  42          * CWAV USBee SX
  43          */
  44         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  45                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  46
  47         /*
  48          * Saleae Logic
  49          * EE Electronics ESLA100
  50          * Robomotic MiniLogic
  51          * Robomotic BugLogic 3
  52          */
  53         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  54                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  55
  56         /*
  57          * Default Cypress FX2 without EEPROM, e.g.:
  58          * Lcsoft Mini Board
  59          * Braintechnology USB Interface V2.x
  60          */
  61         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  62                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  63
  64         /*
  65          * Braintechnology USB-LPS
  66          */
  67         { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
  68                 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw", 8 },
  69
  70         { 0, 0, 0, 0, 0, 0, 0 }
  71 };
  72
  73 static int hwcaps[] = {
  74         SR_HWCAP_LOGIC_ANALYZER,
  75         SR_HWCAP_SAMPLERATE,
  76
  77         /* These are really implemented in the driver, not the hardware. */
  78         SR_HWCAP_LIMIT_SAMPLES,
  79         SR_HWCAP_CONTINUOUS,
  80         0,
  81 };
  82
  83 /*
  84  * TODO: Different probe_names[] for each supported device.
  85  */
  86 static const char *probe_names[] = {
  87         "0",
  88         "1",
  89         "2",
  90         "3",
  91         "4",
  92         "5",
  93         "6",
  94         "7",
  95         NULL,
  96 };
  97
  98 static uint64_t supported_samplerates[] = {
  99         SR_KHZ(20),
 100         SR_KHZ(25),
 101         SR_KHZ(50),
 102         SR_KHZ(100),
 103         SR_KHZ(200),
 104         SR_KHZ(250),
 105         SR_KHZ(500),
 106         SR_MHZ(1),
 107         SR_MHZ(2),
 108         SR_MHZ(3),
 109         SR_MHZ(4),
 110         SR_MHZ(6),
 111         SR_MHZ(8),
 112         SR_MHZ(12),
 113         SR_MHZ(16),
 114         SR_MHZ(24),
 115         0,
 116 };
 117
 118 static struct sr_samplerates samplerates = {
 119         0,
 120         0,
 121         0,
 122         supported_samplerates,
 123 };
 124
 125 static GSList *dev_insts = NULL;
 126 static libusb_context *usb_context = NULL;
 127
 128 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 129 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 130
 131 /**
 132  * Check the USB configuration to determine if this is an fx2lafw device.
 133  *
 134  * @return TRUE if the device's configuration profile match fx2lafw
 135  *         configuration, FALSE otherwise.
 136  */
 137 static gboolean check_conf_profile(libusb_device *dev)
 138 {
 139         struct libusb_device_descriptor des;
 140         struct libusb_device_handle *hdl;
 141         gboolean ret;
 142         unsigned char strdesc[64];
 143
 144         hdl = NULL;
 145         ret = FALSE;
 146         while (!ret) {
 147                 /* Assume the FW has not been loaded, unless proven wrong. */
 148                 if (libusb_get_device_descriptor(dev, &des) != 0)
 149                         break;
 150
 151                 if (libusb_open(dev, &hdl) != 0)
 152                         break;
 153
 154                 if (libusb_get_string_descriptor_ascii(hdl,
 155                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 156                         break;
 157                 if (strncmp((const char *)strdesc, "sigrok", 6))
 158                         break;
 159
 160                 if (libusb_get_string_descriptor_ascii(hdl,
 161                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 162                         break;
 163                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 164                         break;
 165
 166                 /* If we made it here, it must be an fx2lafw. */
 167                 ret = TRUE;
 168         }
 169         if (hdl)
 170                 libusb_close(hdl);
 171
 172         return ret;
 173 }
 174
 175 static int fx2lafw_dev_open(int dev_index)
 176 {
 177         libusb_device **devlist;
 178         struct libusb_device_descriptor des;
 179         struct sr_dev_inst *sdi;
 180         struct context *ctx;
 181         struct version_info vi;
 182         int ret, skip, i;
 183         uint8_t revid;
 184
 185         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 186                 return SR_ERR;
 187         ctx = sdi->priv;
 188
 189         if (sdi->status == SR_ST_ACTIVE)
 190                 /* already in use */
 191                 return SR_ERR;
 192
 193         skip = 0;
 194         const int device_count = libusb_get_device_list(usb_context, &devlist);
 195         if (device_count < 0) {
 196                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 197                         device_count);
 198                 return SR_ERR;
 199         }
 200
 201         for (i = 0; i < device_count; i++) {
 202                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 203                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 204                                ret);
 205                         continue;
 206                 }
 207
 208                 if (des.idVendor != ctx->profile->vid
 209                     || des.idProduct != ctx->profile->pid)
 210                         continue;
 211
 212                 if (sdi->status == SR_ST_INITIALIZING) {
 213                         if (skip != dev_index) {
 214                                 /* Skip devices of this type that aren't the one we want. */
 215                                 skip += 1;
 216                                 continue;
 217                         }
 218                 } else if (sdi->status == SR_ST_INACTIVE) {
 219                         /*
 220                          * This device is fully enumerated, so we need to find
 221                          * this device by vendor, product, bus and address.
 222                          */
 223                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 224                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 225                                 /* this is not the one */
 226                                 continue;
 227                 }
 228
 229                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 230                         if (ctx->usb->address == 0xff)
 231                                 /*
 232                                  * first time we touch this device after firmware upload,
 233                                  * so we don't know the address yet.
 234                                  */
 235                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 236                 } else {
 237                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 238                         break;
 239                 }
 240
 241                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 242                 if (ret != SR_OK) {
 243                         sr_err("fx2lafw: Failed to retrieve "
 244                                "firmware version information.");
 245                         break;
 246                 }
 247
 248                 ret = command_get_revid_version(ctx->usb->devhdl, &revid);
 249                 if (ret != SR_OK) {
 250                         sr_err("fx2lafw: Failed to retrieve REVID.");
 251                         break;
 252                 }
 253
 254                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 255                     vi.minor != FX2LAFW_VERSION_MINOR) {
 256                         sr_err("fx2lafw: Expected firmware version %d.%d "
 257                                "got %d.%d.", FX2LAFW_VERSION_MAJOR,
 258                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 259                         break;
 260                 }
 261
 262                 sdi->status = SR_ST_ACTIVE;
 263                 sr_info("fx2lafw: Opened device %d on %d.%d "
 264                         "interface %d, firmware %d.%d, REVID %d.",
 265                         sdi->index, ctx->usb->bus, ctx->usb->address,
 266                         USB_INTERFACE, vi.major, vi.minor, revid);
 267
 268                 break;
 269         }
 270         libusb_free_device_list(devlist, 1);
 271
 272         if (sdi->status != SR_ST_ACTIVE)
 273                 return SR_ERR;
 274
 275         return SR_OK;
 276 }
 277
 278 static void close_dev(struct sr_dev_inst *sdi)
 279 {
 280         struct context *ctx;
 281
 282         ctx = sdi->priv;
 283
 284         if (ctx->usb->devhdl == NULL)
 285                 return;
 286
 287         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 288                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 289         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 290         libusb_close(ctx->usb->devhdl);
 291         ctx->usb->devhdl = NULL;
 292         sdi->status = SR_ST_INACTIVE;
 293 }
 294
 295 static int configure_probes(struct context *ctx, GSList *probes)
 296 {
 297         struct sr_probe *probe;
 298         GSList *l;
 299         int probe_bit, stage, i;
 300         char *tc;
 301
 302         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 303                 ctx->trigger_mask[i] = 0;
 304                 ctx->trigger_value[i] = 0;
 305         }
 306
 307         stage = -1;
 308         for (l = probes; l; l = l->next) {
 309                 probe = (struct sr_probe *)l->data;
 310                 if (probe->enabled == FALSE)
 311                         continue;
 312                 probe_bit = 1 << (probe->index - 1);
 313                 if (!(probe->trigger))
 314                         continue;
 315
 316                 stage = 0;
 317                 for (tc = probe->trigger; *tc; tc++) {
 318                         ctx->trigger_mask[stage] |= probe_bit;
 319                         if (*tc == '1')
 320                                 ctx->trigger_value[stage] |= probe_bit;
 321                         stage++;
 322                         if (stage > NUM_TRIGGER_STAGES)
 323                                 return SR_ERR;
 324                 }
 325         }
 326
 327         if (stage == -1)
 328                 /*
 329                  * We didn't configure any triggers, make sure acquisition
 330                  * doesn't wait for any.
 331                  */
 332                 ctx->trigger_stage = TRIGGER_FIRED;
 333         else
 334                 ctx->trigger_stage = 0;
 335
 336         return SR_OK;
 337 }
 338
 339 static struct context *fx2lafw_dev_new(void)
 340 {
 341         struct context *ctx;
 342
 343         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 344                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 345                 return NULL;
 346         }
 347
 348         ctx->trigger_stage = TRIGGER_FIRED;
 349
 350         return ctx;
 351 }
 352
 353 /*
 354  * API callbacks
 355  */
 356
 357 static int hw_init(const char *devinfo)
 358 {
 359         struct sr_dev_inst *sdi;
 360         struct libusb_device_descriptor des;
 361         const struct fx2lafw_profile *prof;
 362         struct context *ctx;
 363         libusb_device **devlist;
 364         int ret;
 365         int devcnt = 0;
 366         int i, j;
 367
 368         /* Avoid compiler warnings. */
 369         (void)devinfo;
 370
 371         if (libusb_init(&usb_context) != 0) {
 372                 sr_warn("fx2lafw: Failed to initialize libusb.");
 373                 return 0;
 374         }
 375
 376         /* Find all fx2lafw compatible devices and upload firmware to them. */
 377         libusb_get_device_list(usb_context, &devlist);
 378         for (i = 0; devlist[i]; i++) {
 379
 380                 if ((ret = libusb_get_device_descriptor(
 381                      devlist[i], &des)) != 0) {
 382                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 383                         continue;
 384                 }
 385
 386                 prof = NULL;
 387                 for (j = 0; supported_fx2[j].vid; j++) {
 388                         if (des.idVendor == supported_fx2[j].vid &&
 389                                 des.idProduct == supported_fx2[j].pid) {
 390                                 prof = &supported_fx2[j];
 391                         }
 392                 }
 393
 394                 /* Skip if the device was not found */
 395                 if (!prof)
 396                         continue;
 397
 398                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 399                         prof->vendor, prof->model, prof->model_version);
 400                 if (!sdi)
 401                         return 0;
 402
 403                 ctx = fx2lafw_dev_new();
 404                 ctx->profile = prof;
 405                 sdi->priv = ctx;
 406                 dev_insts = g_slist_append(dev_insts, sdi);
 407
 408                 if (check_conf_profile(devlist[i])) {
 409                         /* Already has the firmware, so fix the new address. */
 410                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 411                         sdi->status = SR_ST_INACTIVE;
 412                         ctx->usb = sr_usb_dev_inst_new
 413                             (libusb_get_bus_number(devlist[i]),
 414                              libusb_get_device_address(devlist[i]), NULL);
 415                 } else {
 416                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 417                                 prof->firmware) == SR_OK)
 418                                 /* Remember when the firmware on this device was updated */
 419                                 ctx->fw_updated = g_get_monotonic_time();
 420                         else
 421                                 sr_err("fx2lafw: Firmware upload failed for "
 422                                        "device %d.", devcnt);
 423                         ctx->usb = sr_usb_dev_inst_new
 424                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 425                 }
 426
 427                 devcnt++;
 428         }
 429         libusb_free_device_list(devlist, 1);
 430
 431         return devcnt;
 432 }
 433
 434 static int hw_dev_open(int dev_index)
 435 {
 436         struct sr_dev_inst *sdi;
 437         struct context *ctx;
 438         int ret;
 439         int64_t timediff_us, timediff_ms;
 440
 441         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 442                 return SR_ERR;
 443         ctx = sdi->priv;
 444
 445         /*
 446          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 447          * milliseconds for the FX2 to renumerate.
 448          */
 449         ret = 0;
 450
 451         if (ctx->fw_updated > 0) {
 452                 sr_info("fx2lafw: Waiting for device to reset.");
 453                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 454                 g_usleep(300 * 1000);
 455                 timediff_ms = 0;
 456                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 457                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 458                                 break;
 459                         g_usleep(100 * 1000);
 460
 461                         timediff_us = g_get_monotonic_time() - ctx->fw_updated;
 462                         timediff_ms = timediff_us / G_USEC_PER_SEC;
 463                         sr_spew("fx2lafw: timediff: %" PRIi64 " us.",
 464                                 timediff_us);
 465                 }
 466                 sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
 467         } else {
 468                 ret = fx2lafw_dev_open(dev_index);
 469         }
 470
 471         if (ret != SR_OK) {
 472                 sr_err("fx2lafw: Unable to open device.");
 473                 return SR_ERR;
 474         }
 475         ctx = sdi->priv;
 476
 477         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 478         if (ret != 0) {
 479                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 480                 return SR_ERR;
 481         }
 482
 483         if (ctx->cur_samplerate == 0) {
 484                 /* Samplerate hasn't been set; default to the slowest one. */
 485                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 486                     &supported_samplerates[0]) == SR_ERR)
 487                         return SR_ERR;
 488         }
 489
 490         return SR_OK;
 491 }
 492
 493 static int hw_dev_close(int dev_index)
 494 {
 495         struct sr_dev_inst *sdi;
 496
 497         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 498                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 499                 return SR_ERR_BUG;
 500         }
 501
 502         /* TODO */
 503         close_dev(sdi);
 504
 505         return SR_OK;
 506 }
 507
 508 static int hw_cleanup(void)
 509 {
 510         GSList *l;
 511         struct sr_dev_inst *sdi;
 512         struct context *ctx;
 513         int ret = SR_OK;
 514
 515         for (l = dev_insts; l; l = l->next) {
 516                 if (!(sdi = l->data)) {
 517                         /* Log error, but continue cleaning up the rest. */
 518                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 519                                __func__);
 520                         ret = SR_ERR_BUG;
 521                         continue;
 522                 }
 523                 if (!(ctx = sdi->priv)) {
 524                         /* Log error, but continue cleaning up the rest. */
 525                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 526                                __func__);
 527                         ret = SR_ERR_BUG;
 528                         continue;
 529                 }
 530                 close_dev(sdi);
 531                 sdi = l->data;
 532                 sr_dev_inst_free(sdi);
 533         }
 534
 535         g_slist_free(dev_insts);
 536         dev_insts = NULL;
 537
 538         if (usb_context)
 539                 libusb_exit(usb_context);
 540         usb_context = NULL;
 541
 542         return ret;
 543 }
 544
 545 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 546 {
 547         struct sr_dev_inst *sdi;
 548         struct context *ctx;
 549
 550         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 551                 return NULL;
 552         ctx = sdi->priv;
 553
 554         switch (dev_info_id) {
 555         case SR_DI_INST:
 556                 return sdi;
 557         case SR_DI_NUM_PROBES:
 558                 return GINT_TO_POINTER(ctx->profile->num_probes);
 559         case SR_DI_PROBE_NAMES:
 560                 return probe_names;
 561         case SR_DI_SAMPLERATES:
 562                 return &samplerates;
 563         case SR_DI_TRIGGER_TYPES:
 564                 return TRIGGER_TYPES;
 565         case SR_DI_CUR_SAMPLERATE:
 566                 return &ctx->cur_samplerate;
 567         }
 568
 569         return NULL;
 570 }
 571
 572 static int hw_dev_status_get(int dev_index)
 573 {
 574         const struct sr_dev_inst *const sdi =
 575                 sr_dev_inst_get(dev_insts, dev_index);
 576
 577         if (!sdi)
 578                 return SR_ST_NOT_FOUND;
 579
 580         return sdi->status;
 581 }
 582
 583 static int *hw_hwcap_get_all(void)
 584 {
 585         return hwcaps;
 586 }
 587
 588 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 589 {
 590         struct sr_dev_inst *sdi;
 591         struct context *ctx;
 592         int ret;
 593
 594         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 595                 return SR_ERR;
 596         ctx = sdi->priv;
 597
 598         if (hwcap == SR_HWCAP_SAMPLERATE) {
 599                 ctx->cur_samplerate = *(uint64_t *)value;
 600                 ret = SR_OK;
 601         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 602                 ret = configure_probes(ctx, (GSList *) value);
 603         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 604                 ctx->limit_samples = *(uint64_t *)value;
 605                 ret = SR_OK;
 606         } else {
 607                 ret = SR_ERR;
 608         }
 609
 610         return ret;
 611 }
 612
 613 static int receive_data(int fd, int revents, void *cb_data)
 614 {
 615         struct timeval tv;
 616
 617         /* Avoid compiler warnings. */
 618         (void)fd;
 619         (void)revents;
 620         (void)cb_data;
 621
 622         tv.tv_sec = tv.tv_usec = 0;
 623         libusb_handle_events_timeout(usb_context, &tv);
 624
 625         return TRUE;
 626 }
 627
 628 static void abort_acquisition(struct context *ctx)
 629 {
 630         ctx->num_samples = -1;
 631 }
 632
 633 static void finish_acquisition(struct context *ctx)
 634 {
 635         struct sr_datafeed_packet packet;
 636         int i;
 637
 638         /* Terminate session */
 639         packet.type = SR_DF_END;
 640         sr_session_send(ctx->session_dev_id, &packet);
 641
 642         /* Remove fds from polling */
 643         const struct libusb_pollfd **const lupfd =
 644                 libusb_get_pollfds(usb_context);
 645         for (i = 0; lupfd[i]; i++)
 646                 sr_source_remove(lupfd[i]->fd);
 647         free(lupfd); /* NOT g_free()! */
 648 }
 649
 650 static void receive_transfer(struct libusb_transfer *transfer)
 651 {
 652         /* TODO: These statics have to move to the ctx struct. */
 653         static int empty_transfer_count = 0;
 654         struct sr_datafeed_packet packet;
 655         struct sr_datafeed_logic logic;
 656         struct context *ctx = transfer->user_data;
 657         int cur_buflen, trigger_offset, i;
 658         unsigned char *cur_buf, *new_buf;
 659
 660         /*
 661          * If acquisition has already ended, just free any queued up
 662          * transfer that come in.
 663          */
 664         if (ctx->num_samples == -1) {
 665                 if (transfer)
 666                         libusb_free_transfer(transfer);
 667
 668                 ctx->submitted_transfers--;
 669                 if (ctx->submitted_transfers == 0)
 670                         finish_acquisition(ctx);
 671
 672                 return;
 673         }
 674
 675         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 676                 transfer->status, transfer->actual_length);
 677
 678         /* Save incoming transfer before reusing the transfer struct. */
 679         cur_buf = transfer->buffer;
 680         cur_buflen = transfer->actual_length;
 681
 682         /* Fire off a new request. */
 683         if (!(new_buf = g_try_malloc(4096))) {
 684                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 685                 return; /* TODO: SR_ERR_MALLOC */
 686         }
 687
 688         transfer->buffer = new_buf;
 689         transfer->length = 4096;
 690         if (libusb_submit_transfer(transfer) != 0) {
 691                 /* TODO: Stop session? */
 692                 /* TODO: Better error message. */
 693                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 694         }
 695
 696         if (cur_buflen == 0) {
 697                 empty_transfer_count++;
 698                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 699                         /*
 700                          * The FX2 gave up. End the acquisition, the frontend
 701                          * will work out that the samplecount is short.
 702                          */
 703                         abort_acquisition(ctx);
 704                 }
 705                 return;
 706         } else {
 707                 empty_transfer_count = 0;
 708         }
 709
 710         trigger_offset = 0;
 711         if (ctx->trigger_stage >= 0) {
 712                 for (i = 0; i < cur_buflen; i++) {
 713
 714                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 715                                 /* Match on this trigger stage. */
 716                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 717                                 ctx->trigger_stage++;
 718
 719                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 720                                         /* Match on all trigger stages, we're done. */
 721                                         trigger_offset = i + 1;
 722
 723                                         /*
 724                                          * TODO: Send pre-trigger buffer to session bus.
 725                                          * Tell the frontend we hit the trigger here.
 726                                          */
 727                                         packet.type = SR_DF_TRIGGER;
 728                                         packet.payload = NULL;
 729                                         sr_session_send(ctx->session_dev_id, &packet);
 730
 731                                         /*
 732                                          * Send the samples that triggered it, since we're
 733                                          * skipping past them.
 734                                          */
 735                                         packet.type = SR_DF_LOGIC;
 736                                         packet.payload = &logic;
 737                                         logic.length = ctx->trigger_stage;
 738                                         logic.unitsize = 1;
 739                                         logic.data = ctx->trigger_buffer;
 740                                         sr_session_send(ctx->session_dev_id, &packet);
 741
 742                                         ctx->trigger_stage = TRIGGER_FIRED;
 743                                         break;
 744                                 }
 745                                 return;
 746                         }
 747
 748                         /*
 749                          * We had a match before, but not in the next sample. However, we may
 750                          * have a match on this stage in the next bit -- trigger on 0001 will
 751                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 752                          * the next sample from the one that matched originally, which the
 753                          * counter increment at the end of the loop takes care of.
 754                          */
 755                         if (ctx->trigger_stage > 0) {
 756                                 i -= ctx->trigger_stage;
 757                                 if (i < -1)
 758                                         i = -1; /* Oops, went back past this buffer. */
 759                                 /* Reset trigger stage. */
 760                                 ctx->trigger_stage = 0;
 761                         }
 762                 }
 763         }
 764
 765         if (ctx->trigger_stage == TRIGGER_FIRED) {
 766                 /* Send the incoming transfer to the session bus. */
 767                 packet.type = SR_DF_LOGIC;
 768                 packet.payload = &logic;
 769                 logic.length = cur_buflen - trigger_offset;
 770                 logic.unitsize = 1;
 771                 logic.data = cur_buf + trigger_offset;
 772                 sr_session_send(ctx->session_dev_id, &packet);
 773                 g_free(cur_buf);
 774
 775                 ctx->num_samples += cur_buflen;
 776                 if (ctx->limit_samples &&
 777                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 778                         abort_acquisition(ctx);
 779                 }
 780         } else {
 781                 /*
 782                  * TODO: Buffer pre-trigger data in capture
 783                  * ratio-sized buffer.
 784                  */
 785         }
 786 }
 787
 788 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 789 {
 790         struct sr_dev_inst *sdi;
 791         struct sr_datafeed_packet *packet;
 792         struct sr_datafeed_header *header;
 793         struct context *ctx;
 794         struct libusb_transfer *transfer;
 795         const struct libusb_pollfd **lupfd;
 796         int ret, size, i;
 797         unsigned char *buf;
 798
 799         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 800                 return SR_ERR;
 801         ctx = sdi->priv;
 802         ctx->session_dev_id = cb_data;
 803         ctx->num_samples = 0;
 804
 805         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 806                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 807                 return SR_ERR_MALLOC;
 808         }
 809
 810         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 811                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 812                 return SR_ERR_MALLOC;
 813         }
 814
 815         /* Start with 2K transfer, subsequently increased to 4K. */
 816         size = 2048;
 817         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 818                 if (!(buf = g_try_malloc(size))) {
 819                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 820                         return SR_ERR_MALLOC;
 821                 }
 822                 transfer = libusb_alloc_transfer(0);
 823                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 824                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 825                                 receive_transfer, ctx, 40);
 826                 if (libusb_submit_transfer(transfer) != 0) {
 827                         /* TODO: Free them all. */
 828                         libusb_free_transfer(transfer);
 829                         g_free(buf);
 830                         return SR_ERR;
 831                 }
 832
 833                 ctx->submitted_transfers++;
 834                 size = 4096;
 835         }
 836
 837         lupfd = libusb_get_pollfds(usb_context);
 838         for (i = 0; lupfd[i]; i++)
 839                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 840                               40, receive_data, NULL);
 841         free(lupfd); /* NOT g_free()! */
 842
 843         packet->type = SR_DF_HEADER;
 844         packet->payload = header;
 845         header->feed_version = 1;
 846         gettimeofday(&header->starttime, NULL);
 847         header->samplerate = ctx->cur_samplerate;
 848         header->num_logic_probes = ctx->profile->num_probes;
 849         sr_session_send(cb_data, packet);
 850         g_free(header);
 851         g_free(packet);
 852
 853         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 854                 ctx->cur_samplerate)) != SR_OK) {
 855                 return ret;
 856         }
 857
 858         return SR_OK;
 859 }
 860
 861 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 862 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 863 {
 864         struct sr_dev_inst *sdi;
 865
 866         /* Avoid compiler warnings. */
 867         (void)cb_data;
 868
 869         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 870                 return SR_ERR;
 871
 872         abort_acquisition(sdi->priv);
 873
 874         return SR_OK;
 875 }
 876
 877 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 878         .name = "fx2lafw",
 879         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 880         .api_version = 1,
 881         .init = hw_init,
 882         .cleanup = hw_cleanup,
 883         .dev_open = hw_dev_open,
 884         .dev_close = hw_dev_close,
 885         .dev_info_get = hw_dev_info_get,
 886         .dev_status_get = hw_dev_status_get,
 887         .hwcap_get_all = hw_hwcap_get_all,
 888         .dev_config_set = hw_dev_config_set,
 889         .dev_acquisition_start = hw_dev_acquisition_start,
 890         .dev_acquisition_stop = hw_dev_acquisition_stop,
 891 };