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
 179         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 180                 return SR_ERR;
 181         ctx = sdi->priv;
 182
 183         if (sdi->status == SR_ST_ACTIVE)
 184                 /* already in use */
 185                 return SR_ERR;
 186
 187         skip = 0;
 188         const int device_count = libusb_get_device_list(usb_context, &devlist);
 189         if (device_count < 0) {
 190                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 191                         device_count);
 192                 return SR_ERR;
 193         }
 194
 195         for (i = 0; i < device_count; i++) {
 196                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 197                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 198                                ret);
 199                         continue;
 200                 }
 201
 202                 if (des.idVendor != ctx->profile->vid
 203                     || des.idProduct != ctx->profile->pid)
 204                         continue;
 205
 206                 if (sdi->status == SR_ST_INITIALIZING) {
 207                         if (skip != dev_index) {
 208                                 /* Skip devices of this type that aren't the one we want. */
 209                                 skip += 1;
 210                                 continue;
 211                         }
 212                 } else if (sdi->status == SR_ST_INACTIVE) {
 213                         /*
 214                          * This device is fully enumerated, so we need to find
 215                          * this device by vendor, product, bus and address.
 216                          */
 217                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 218                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 219                                 /* this is not the one */
 220                                 continue;
 221                 }
 222
 223                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 224                         if (ctx->usb->address == 0xff)
 225                                 /*
 226                                  * first time we touch this device after firmware upload,
 227                                  * so we don't know the address yet.
 228                                  */
 229                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 230                 } else {
 231                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 232                         break;
 233                 }
 234
 235                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 236                 if (ret != SR_OK) {
 237                         sr_err("fx2lafw: Failed to retrieve "
 238                                "firmware version information.");
 239                         break;
 240                 }
 241
 242                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 243                     vi.minor != FX2LAFW_VERSION_MINOR) {
 244                         sr_err("fx2lafw: Expected firmware version %d.%02d "
 245                                "got %d.%02d.", FX2LAFW_VERSION_MAJOR,
 246                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 247                         break;
 248                 }
 249
 250                 sdi->status = SR_ST_ACTIVE;
 251                 sr_info("fx2lafw: Opened device %d on %d.%d "
 252                         "interface %d, firmware version %d.%02d",
 253                         sdi->index, ctx->usb->bus, ctx->usb->address,
 254                         USB_INTERFACE, vi.major, vi.minor);
 255
 256                 break;
 257         }
 258         libusb_free_device_list(devlist, 1);
 259
 260         if (sdi->status != SR_ST_ACTIVE)
 261                 return SR_ERR;
 262
 263         return SR_OK;
 264 }
 265
 266 static void close_dev(struct sr_dev_inst *sdi)
 267 {
 268         struct context *ctx;
 269
 270         ctx = sdi->priv;
 271
 272         if (ctx->usb->devhdl == NULL)
 273                 return;
 274
 275         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 276                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 277         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 278         libusb_close(ctx->usb->devhdl);
 279         ctx->usb->devhdl = NULL;
 280         sdi->status = SR_ST_INACTIVE;
 281 }
 282
 283 static int configure_probes(struct context *ctx, GSList *probes)
 284 {
 285         struct sr_probe *probe;
 286         GSList *l;
 287         int probe_bit, stage, i;
 288         char *tc;
 289
 290         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 291                 ctx->trigger_mask[i] = 0;
 292                 ctx->trigger_value[i] = 0;
 293         }
 294
 295         stage = -1;
 296         for (l = probes; l; l = l->next) {
 297                 probe = (struct sr_probe *)l->data;
 298                 if (probe->enabled == FALSE)
 299                         continue;
 300                 probe_bit = 1 << (probe->index - 1);
 301                 if (!(probe->trigger))
 302                         continue;
 303
 304                 stage = 0;
 305                 for (tc = probe->trigger; *tc; tc++) {
 306                         ctx->trigger_mask[stage] |= probe_bit;
 307                         if (*tc == '1')
 308                                 ctx->trigger_value[stage] |= probe_bit;
 309                         stage++;
 310                         if (stage > NUM_TRIGGER_STAGES)
 311                                 return SR_ERR;
 312                 }
 313         }
 314
 315         if (stage == -1)
 316                 /*
 317                  * We didn't configure any triggers, make sure acquisition
 318                  * doesn't wait for any.
 319                  */
 320                 ctx->trigger_stage = TRIGGER_FIRED;
 321         else
 322                 ctx->trigger_stage = 0;
 323
 324         return SR_OK;
 325 }
 326
 327 static struct context *fx2lafw_dev_new(void)
 328 {
 329         struct context *ctx;
 330
 331         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 332                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 333                 return NULL;
 334         }
 335
 336         ctx->trigger_stage = TRIGGER_FIRED;
 337
 338         return ctx;
 339 }
 340
 341 /*
 342  * API callbacks
 343  */
 344
 345 static int hw_init(const char *devinfo)
 346 {
 347         struct sr_dev_inst *sdi;
 348         struct libusb_device_descriptor des;
 349         const struct fx2lafw_profile *prof;
 350         struct context *ctx;
 351         libusb_device **devlist;
 352         int ret;
 353         int devcnt = 0;
 354         int i, j;
 355
 356         /* Avoid compiler warnings. */
 357         (void)devinfo;
 358
 359         if (libusb_init(&usb_context) != 0) {
 360                 sr_warn("fx2lafw: Failed to initialize libusb.");
 361                 return 0;
 362         }
 363
 364         /* Find all fx2lafw compatible devices and upload firware to them. */
 365         libusb_get_device_list(usb_context, &devlist);
 366         for (i = 0; devlist[i]; i++) {
 367
 368                 if ((ret = libusb_get_device_descriptor(
 369                      devlist[i], &des)) != 0) {
 370                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 371                         continue;
 372                 }
 373
 374                 prof = NULL;
 375                 for (j = 0; supported_fx2[j].vid; j++) {
 376                         if (des.idVendor == supported_fx2[j].vid &&
 377                                 des.idProduct == supported_fx2[j].pid) {
 378                                 prof = &supported_fx2[j];
 379                         }
 380                 }
 381
 382                 /* Skip if the device was not found */
 383                 if (!prof)
 384                         continue;
 385
 386                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 387                         prof->vendor, prof->model, prof->model_version);
 388                 if (!sdi)
 389                         return 0;
 390
 391                 ctx = fx2lafw_dev_new();
 392                 ctx->profile = prof;
 393                 sdi->priv = ctx;
 394                 dev_insts = g_slist_append(dev_insts, sdi);
 395
 396                 if (check_conf_profile(devlist[i])) {
 397                         /* Already has the firmware, so fix the new address. */
 398                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 399                         sdi->status = SR_ST_INACTIVE;
 400                         ctx->usb = sr_usb_dev_inst_new
 401                             (libusb_get_bus_number(devlist[i]),
 402                              libusb_get_device_address(devlist[i]), NULL);
 403                 } else {
 404                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 405                                 prof->firmware) == SR_OK)
 406                                 /* Remember when the firmware on this device was updated */
 407                                 g_get_current_time(&ctx->fw_updated);
 408                         else
 409                                 sr_err("fx2lafw: Firmware upload failed for "
 410                                        "device %d.", devcnt);
 411                         ctx->usb = sr_usb_dev_inst_new
 412                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 413                 }
 414
 415                 devcnt++;
 416         }
 417         libusb_free_device_list(devlist, 1);
 418
 419         return devcnt;
 420 }
 421
 422 static int hw_dev_open(int dev_index)
 423 {
 424         GTimeVal cur_time;
 425         struct sr_dev_inst *sdi;
 426         struct context *ctx;
 427         int timediff, ret;
 428
 429         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 430                 return SR_ERR;
 431         ctx = sdi->priv;
 432
 433         /*
 434          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 435          * for the FX2 to renumerate.
 436          */
 437         ret = 0;
 438         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 439                 sr_info("fx2lafw: Waiting for device to reset.");
 440                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 441                 g_usleep(300 * 1000);
 442                 timediff = 0;
 443                 while (timediff < MAX_RENUM_DELAY) {
 444                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 445                                 break;
 446                         g_usleep(100 * 1000);
 447                         g_get_current_time(&cur_time);
 448                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 449                 }
 450                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 451         } else {
 452                 ret = fx2lafw_dev_open(dev_index);
 453         }
 454
 455         if (ret != SR_OK) {
 456                 sr_err("fx2lafw: Unable to open device.");
 457                 return SR_ERR;
 458         }
 459         ctx = sdi->priv;
 460
 461         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 462         if (ret != 0) {
 463                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 464                 return SR_ERR;
 465         }
 466
 467         if (ctx->cur_samplerate == 0) {
 468                 /* Samplerate hasn't been set; default to the slowest one. */
 469                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 470                     &supported_samplerates[0]) == SR_ERR)
 471                         return SR_ERR;
 472         }
 473
 474         return SR_OK;
 475 }
 476
 477 static int hw_dev_close(int dev_index)
 478 {
 479         struct sr_dev_inst *sdi;
 480
 481         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 482                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 483                 return SR_ERR_BUG;
 484         }
 485
 486         /* TODO */
 487         close_dev(sdi);
 488
 489         return SR_OK;
 490 }
 491
 492 static int hw_cleanup(void)
 493 {
 494         GSList *l;
 495         struct sr_dev_inst *sdi;
 496         struct context *ctx;
 497         int ret = SR_OK;
 498
 499         for (l = dev_insts; l; l = l->next) {
 500                 if (!(sdi = l->data)) {
 501                         /* Log error, but continue cleaning up the rest. */
 502                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 503                                __func__);
 504                         ret = SR_ERR_BUG;
 505                         continue;
 506                 }
 507                 if (!(ctx = sdi->priv)) {
 508                         /* Log error, but continue cleaning up the rest. */
 509                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 510                                __func__);
 511                         ret = SR_ERR_BUG;
 512                         continue;
 513                 }
 514                 close_dev(sdi);
 515                 sdi = l->data;
 516                 sr_dev_inst_free(sdi);
 517         }
 518
 519         g_slist_free(dev_insts);
 520         dev_insts = NULL;
 521
 522         if (usb_context)
 523                 libusb_exit(usb_context);
 524         usb_context = NULL;
 525
 526         return ret;
 527 }
 528
 529 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 530 {
 531         struct sr_dev_inst *sdi;
 532         struct context *ctx;
 533
 534         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 535                 return NULL;
 536         ctx = sdi->priv;
 537
 538         switch (dev_info_id) {
 539         case SR_DI_INST:
 540                 return sdi;
 541         case SR_DI_NUM_PROBES:
 542                 return GINT_TO_POINTER(ctx->profile->num_probes);
 543         case SR_DI_PROBE_NAMES:
 544                 return probe_names;
 545         case SR_DI_SAMPLERATES:
 546                 return &samplerates;
 547         case SR_DI_TRIGGER_TYPES:
 548                 return TRIGGER_TYPES;
 549         case SR_DI_CUR_SAMPLERATE:
 550                 return &ctx->cur_samplerate;
 551         }
 552
 553         return NULL;
 554 }
 555
 556 static int hw_dev_status_get(int dev_index)
 557 {
 558         const struct sr_dev_inst *const sdi =
 559                 sr_dev_inst_get(dev_insts, dev_index);
 560
 561         if (!sdi)
 562                 return SR_ST_NOT_FOUND;
 563
 564         return sdi->status;
 565 }
 566
 567 static int *hw_hwcap_get_all(void)
 568 {
 569         return hwcaps;
 570 }
 571
 572 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 573 {
 574         struct sr_dev_inst *sdi;
 575         struct context *ctx;
 576         int ret;
 577
 578         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 579                 return SR_ERR;
 580         ctx = sdi->priv;
 581
 582         if (hwcap == SR_HWCAP_SAMPLERATE) {
 583                 ctx->cur_samplerate = *(uint64_t *)value;
 584                 ret = SR_OK;
 585         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 586                 ret = configure_probes(ctx, (GSList *) value);
 587         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 588                 ctx->limit_samples = *(uint64_t *)value;
 589                 ret = SR_OK;
 590         } else {
 591                 ret = SR_ERR;
 592         }
 593
 594         return ret;
 595 }
 596
 597 static int receive_data(int fd, int revents, void *cb_data)
 598 {
 599         struct timeval tv;
 600
 601         /* Avoid compiler warnings. */
 602         (void)fd;
 603         (void)revents;
 604         (void)cb_data;
 605
 606         tv.tv_sec = tv.tv_usec = 0;
 607         libusb_handle_events_timeout(usb_context, &tv);
 608
 609         return TRUE;
 610 }
 611
 612 static void abort_acquisition(struct context *ctx)
 613 {
 614         ctx->num_samples = -1;
 615 }
 616
 617 static void finish_acquisition(struct context *ctx)
 618 {
 619         struct sr_datafeed_packet packet;
 620         int i;
 621
 622         /* Terminate session */
 623         packet.type = SR_DF_END;
 624         sr_session_send(ctx->session_dev_id, &packet);
 625
 626         /* Remove fds from polling */
 627         const struct libusb_pollfd **const lupfd =
 628                 libusb_get_pollfds(usb_context);
 629         for (i = 0; lupfd[i]; i++)
 630                 sr_source_remove(lupfd[i]->fd);
 631         free(lupfd); /* NOT g_free()! */
 632 }
 633
 634 static void receive_transfer(struct libusb_transfer *transfer)
 635 {
 636         /* TODO: These statics have to move to the ctx struct. */
 637         static int empty_transfer_count = 0;
 638         struct sr_datafeed_packet packet;
 639         struct sr_datafeed_logic logic;
 640         struct context *ctx = transfer->user_data;
 641         int cur_buflen, trigger_offset, i;
 642         unsigned char *cur_buf, *new_buf;
 643
 644         /*
 645          * If acquisition has already ended, just free any queued up
 646          * transfer that come in.
 647          */
 648         if (ctx->num_samples == -1) {
 649                 if (transfer)
 650                         libusb_free_transfer(transfer);
 651
 652                 ctx->submitted_transfers--;
 653                 if (ctx->submitted_transfers == 0)
 654                         finish_acquisition(ctx);
 655
 656                 return;
 657         }
 658
 659         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 660                 transfer->status, transfer->actual_length);
 661
 662         /* Save incoming transfer before reusing the transfer struct. */
 663         cur_buf = transfer->buffer;
 664         cur_buflen = transfer->actual_length;
 665
 666         /* Fire off a new request. */
 667         if (!(new_buf = g_try_malloc(4096))) {
 668                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 669                 return; /* TODO: SR_ERR_MALLOC */
 670         }
 671
 672         transfer->buffer = new_buf;
 673         transfer->length = 4096;
 674         if (libusb_submit_transfer(transfer) != 0) {
 675                 /* TODO: Stop session? */
 676                 /* TODO: Better error message. */
 677                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 678         }
 679
 680         if (cur_buflen == 0) {
 681                 empty_transfer_count++;
 682                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 683                         /*
 684                          * The FX2 gave up. End the acquisition, the frontend
 685                          * will work out that the samplecount is short.
 686                          */
 687                         abort_acquisition(ctx);
 688                 }
 689                 return;
 690         } else {
 691                 empty_transfer_count = 0;
 692         }
 693
 694         trigger_offset = 0;
 695         if (ctx->trigger_stage >= 0) {
 696                 for (i = 0; i < cur_buflen; i++) {
 697
 698                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 699                                 /* Match on this trigger stage. */
 700                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 701                                 ctx->trigger_stage++;
 702
 703                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 704                                         /* Match on all trigger stages, we're done. */
 705                                         trigger_offset = i + 1;
 706
 707                                         /*
 708                                          * TODO: Send pre-trigger buffer to session bus.
 709                                          * Tell the frontend we hit the trigger here.
 710                                          */
 711                                         packet.type = SR_DF_TRIGGER;
 712                                         packet.payload = NULL;
 713                                         sr_session_send(ctx->session_dev_id, &packet);
 714
 715                                         /*
 716                                          * Send the samples that triggered it, since we're
 717                                          * skipping past them.
 718                                          */
 719                                         packet.type = SR_DF_LOGIC;
 720                                         packet.payload = &logic;
 721                                         logic.length = ctx->trigger_stage;
 722                                         logic.unitsize = 1;
 723                                         logic.data = ctx->trigger_buffer;
 724                                         sr_session_send(ctx->session_dev_id, &packet);
 725
 726                                         ctx->trigger_stage = TRIGGER_FIRED;
 727                                         break;
 728                                 }
 729                                 return;
 730                         }
 731
 732                         /*
 733                          * We had a match before, but not in the next sample. However, we may
 734                          * have a match on this stage in the next bit -- trigger on 0001 will
 735                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 736                          * the next sample from the one that matched originally, which the
 737                          * counter increment at the end of the loop takes care of.
 738                          */
 739                         if (ctx->trigger_stage > 0) {
 740                                 i -= ctx->trigger_stage;
 741                                 if (i < -1)
 742                                         i = -1; /* Oops, went back past this buffer. */
 743                                 /* Reset trigger stage. */
 744                                 ctx->trigger_stage = 0;
 745                         }
 746                 }
 747         }
 748
 749         if (ctx->trigger_stage == TRIGGER_FIRED) {
 750                 /* Send the incoming transfer to the session bus. */
 751                 packet.type = SR_DF_LOGIC;
 752                 packet.payload = &logic;
 753                 logic.length = cur_buflen - trigger_offset;
 754                 logic.unitsize = 1;
 755                 logic.data = cur_buf + trigger_offset;
 756                 sr_session_send(ctx->session_dev_id, &packet);
 757                 g_free(cur_buf);
 758
 759                 ctx->num_samples += cur_buflen;
 760                 if (ctx->limit_samples &&
 761                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 762                         abort_acquisition(ctx);
 763                 }
 764         } else {
 765                 /*
 766                  * TODO: Buffer pre-trigger data in capture
 767                  * ratio-sized buffer.
 768                  */
 769         }
 770 }
 771
 772 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 773 {
 774         struct sr_dev_inst *sdi;
 775         struct sr_datafeed_packet *packet;
 776         struct sr_datafeed_header *header;
 777         struct context *ctx;
 778         struct libusb_transfer *transfer;
 779         const struct libusb_pollfd **lupfd;
 780         int ret, size, i;
 781         unsigned char *buf;
 782
 783         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 784                 return SR_ERR;
 785         ctx = sdi->priv;
 786         ctx->session_dev_id = cb_data;
 787         ctx->num_samples = 0;
 788
 789         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 790                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 791                 return SR_ERR_MALLOC;
 792         }
 793
 794         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 795                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 796                 return SR_ERR_MALLOC;
 797         }
 798
 799         /* Start with 2K transfer, subsequently increased to 4K. */
 800         size = 2048;
 801         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 802                 if (!(buf = g_try_malloc(size))) {
 803                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 804                         return SR_ERR_MALLOC;
 805                 }
 806                 transfer = libusb_alloc_transfer(0);
 807                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 808                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 809                                 receive_transfer, ctx, 40);
 810                 if (libusb_submit_transfer(transfer) != 0) {
 811                         /* TODO: Free them all. */
 812                         libusb_free_transfer(transfer);
 813                         g_free(buf);
 814                         return SR_ERR;
 815                 }
 816
 817                 ctx->submitted_transfers++;
 818                 size = 4096;
 819         }
 820
 821         lupfd = libusb_get_pollfds(usb_context);
 822         for (i = 0; lupfd[i]; i++)
 823                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 824                               40, receive_data, NULL);
 825         free(lupfd); /* NOT g_free()! */
 826
 827         packet->type = SR_DF_HEADER;
 828         packet->payload = header;
 829         header->feed_version = 1;
 830         gettimeofday(&header->starttime, NULL);
 831         header->samplerate = ctx->cur_samplerate;
 832         header->num_logic_probes = ctx->profile->num_probes;
 833         sr_session_send(cb_data, packet);
 834         g_free(header);
 835         g_free(packet);
 836
 837         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 838                 ctx->cur_samplerate)) != SR_OK) {
 839                 return ret;
 840         }
 841
 842         return SR_OK;
 843 }
 844
 845 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 846 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 847 {
 848         struct sr_dev_inst *sdi;
 849
 850         /* Avoid compiler warnings. */
 851         (void)cb_data;
 852
 853         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 854                 return SR_ERR;
 855
 856         abort_acquisition(sdi->priv);
 857
 858         return SR_OK;
 859 }
 860
 861 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 862         .name = "fx2lafw",
 863         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 864         .api_version = 1,
 865         .init = hw_init,
 866         .cleanup = hw_cleanup,
 867         .dev_open = hw_dev_open,
 868         .dev_close = hw_dev_close,
 869         .dev_info_get = hw_dev_info_get,
 870         .dev_status_get = hw_dev_status_get,
 871         .hwcap_get_all = hw_hwcap_get_all,
 872         .dev_config_set = hw_dev_config_set,
 873         .dev_acquisition_start = hw_dev_acquisition_start,
 874         .dev_acquisition_stop = hw_dev_acquisition_stop,
 875 };