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