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 <libusb.h>
  25 #include "config.h"
  26 #include "sigrok.h"
  27 #include "sigrok-internal.h"
  28 #include "fx2lafw.h"
  29 #include "command.h"
  30
  31 static const struct fx2lafw_profile supported_fx2[] = {
  32         /*
  33          * CWAV USBee AX
  34          * EE Electronics ESLA201A
  35          * ARMFLY AX-Pro
  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(20),
  99         SR_KHZ(25),
 100         SR_KHZ(50),
 101         SR_KHZ(100),
 102         SR_KHZ(200),
 103         SR_KHZ(250),
 104         SR_KHZ(500),
 105         SR_MHZ(1),
 106         SR_MHZ(2),
 107         SR_MHZ(3),
 108         SR_MHZ(4),
 109         SR_MHZ(6),
 110         SR_MHZ(8),
 111         SR_MHZ(12),
 112         SR_MHZ(16),
 113         SR_MHZ(24),
 114         0,
 115 };
 116
 117 static struct sr_samplerates samplerates = {
 118         0,
 119         0,
 120         0,
 121         supported_samplerates,
 122 };
 123
 124 static GSList *dev_insts = NULL;
 125 static libusb_context *usb_context = NULL;
 126
 127 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 128 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 129
 130 /**
 131  * Check the USB configuration to determine if this is an fx2lafw device.
 132  *
 133  * @return TRUE if the device's configuration profile match fx2lafw
 134  *         configuration, FALSE otherwise.
 135  */
 136 static gboolean check_conf_profile(libusb_device *dev)
 137 {
 138         struct libusb_device_descriptor des;
 139         struct libusb_device_handle *hdl;
 140         gboolean ret;
 141         unsigned char strdesc[64];
 142
 143         hdl = NULL;
 144         ret = FALSE;
 145         while (!ret) {
 146                 /* Assume the FW has not been loaded, unless proven wrong. */
 147                 if (libusb_get_device_descriptor(dev, &des) != 0)
 148                         break;
 149
 150                 if (libusb_open(dev, &hdl) != 0)
 151                         break;
 152
 153                 if (libusb_get_string_descriptor_ascii(hdl,
 154                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 155                         break;
 156                 if (strncmp((const char *)strdesc, "sigrok", 6))
 157                         break;
 158
 159                 if (libusb_get_string_descriptor_ascii(hdl,
 160                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 161                         break;
 162                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 163                         break;
 164
 165                 /* If we made it here, it must be an fx2lafw. */
 166                 ret = TRUE;
 167         }
 168         if (hdl)
 169                 libusb_close(hdl);
 170
 171         return ret;
 172 }
 173
 174 static int fx2lafw_dev_open(int dev_index)
 175 {
 176         libusb_device **devlist;
 177         struct libusb_device_descriptor des;
 178         struct sr_dev_inst *sdi;
 179         struct context *ctx;
 180         struct version_info vi;
 181         int ret, skip, i;
 182         uint8_t revid;
 183
 184         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 185                 return SR_ERR;
 186         ctx = sdi->priv;
 187
 188         if (sdi->status == SR_ST_ACTIVE)
 189                 /* already in use */
 190                 return SR_ERR;
 191
 192         skip = 0;
 193         const int device_count = libusb_get_device_list(usb_context, &devlist);
 194         if (device_count < 0) {
 195                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 196                         device_count);
 197                 return SR_ERR;
 198         }
 199
 200         for (i = 0; i < device_count; i++) {
 201                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 202                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 203                                ret);
 204                         continue;
 205                 }
 206
 207                 if (des.idVendor != ctx->profile->vid
 208                     || des.idProduct != ctx->profile->pid)
 209                         continue;
 210
 211                 if (sdi->status == SR_ST_INITIALIZING) {
 212                         if (skip != dev_index) {
 213                                 /* Skip devices of this type that aren't the one we want. */
 214                                 skip += 1;
 215                                 continue;
 216                         }
 217                 } else if (sdi->status == SR_ST_INACTIVE) {
 218                         /*
 219                          * This device is fully enumerated, so we need to find
 220                          * this device by vendor, product, bus and address.
 221                          */
 222                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 223                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 224                                 /* this is not the one */
 225                                 continue;
 226                 }
 227
 228                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 229                         if (ctx->usb->address == 0xff)
 230                                 /*
 231                                  * first time we touch this device after firmware upload,
 232                                  * so we don't know the address yet.
 233                                  */
 234                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 235                 } else {
 236                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 237                         break;
 238                 }
 239
 240                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 241                 if (ret != SR_OK) {
 242                         sr_err("fx2lafw: Failed to retrieve "
 243                                "firmware version information.");
 244                         break;
 245                 }
 246
 247                 ret = command_get_revid_version(ctx->usb->devhdl, &revid);
 248                 if (ret != SR_OK) {
 249                         sr_err("fx2lafw: Failed to retrieve REVID.");
 250                         break;
 251                 }
 252
 253                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 254                     vi.minor != FX2LAFW_VERSION_MINOR) {
 255                         sr_err("fx2lafw: Expected firmware version %d.%d "
 256                                "got %d.%d.", FX2LAFW_VERSION_MAJOR,
 257                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 258                         break;
 259                 }
 260
 261                 sdi->status = SR_ST_ACTIVE;
 262                 sr_info("fx2lafw: Opened device %d on %d.%d "
 263                         "interface %d, firmware %d.%d, REVID %d.",
 264                         sdi->index, ctx->usb->bus, ctx->usb->address,
 265                         USB_INTERFACE, vi.major, vi.minor, revid);
 266
 267                 break;
 268         }
 269         libusb_free_device_list(devlist, 1);
 270
 271         if (sdi->status != SR_ST_ACTIVE)
 272                 return SR_ERR;
 273
 274         return SR_OK;
 275 }
 276
 277 static void close_dev(struct sr_dev_inst *sdi)
 278 {
 279         struct context *ctx;
 280
 281         ctx = sdi->priv;
 282
 283         if (ctx->usb->devhdl == NULL)
 284                 return;
 285
 286         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 287                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 288         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 289         libusb_close(ctx->usb->devhdl);
 290         ctx->usb->devhdl = NULL;
 291         sdi->status = SR_ST_INACTIVE;
 292 }
 293
 294 static int configure_probes(struct context *ctx, GSList *probes)
 295 {
 296         struct sr_probe *probe;
 297         GSList *l;
 298         int probe_bit, stage, i;
 299         char *tc;
 300
 301         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 302                 ctx->trigger_mask[i] = 0;
 303                 ctx->trigger_value[i] = 0;
 304         }
 305
 306         stage = -1;
 307         for (l = probes; l; l = l->next) {
 308                 probe = (struct sr_probe *)l->data;
 309                 if (probe->enabled == FALSE)
 310                         continue;
 311                 probe_bit = 1 << (probe->index - 1);
 312                 if (!(probe->trigger))
 313                         continue;
 314
 315                 stage = 0;
 316                 for (tc = probe->trigger; *tc; tc++) {
 317                         ctx->trigger_mask[stage] |= probe_bit;
 318                         if (*tc == '1')
 319                                 ctx->trigger_value[stage] |= probe_bit;
 320                         stage++;
 321                         if (stage > NUM_TRIGGER_STAGES)
 322                                 return SR_ERR;
 323                 }
 324         }
 325
 326         if (stage == -1)
 327                 /*
 328                  * We didn't configure any triggers, make sure acquisition
 329                  * doesn't wait for any.
 330                  */
 331                 ctx->trigger_stage = TRIGGER_FIRED;
 332         else
 333                 ctx->trigger_stage = 0;
 334
 335         return SR_OK;
 336 }
 337
 338 static struct context *fx2lafw_dev_new(void)
 339 {
 340         struct context *ctx;
 341
 342         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 343                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 344                 return NULL;
 345         }
 346
 347         ctx->trigger_stage = TRIGGER_FIRED;
 348
 349         return ctx;
 350 }
 351
 352 /*
 353  * API callbacks
 354  */
 355
 356 static int hw_init(const char *devinfo)
 357 {
 358         struct sr_dev_inst *sdi;
 359         struct libusb_device_descriptor des;
 360         const struct fx2lafw_profile *prof;
 361         struct context *ctx;
 362         libusb_device **devlist;
 363         int ret;
 364         int devcnt = 0;
 365         int i, j;
 366
 367         /* Avoid compiler warnings. */
 368         (void)devinfo;
 369
 370         if (libusb_init(&usb_context) != 0) {
 371                 sr_warn("fx2lafw: Failed to initialize libusb.");
 372                 return 0;
 373         }
 374
 375         /* Find all fx2lafw compatible devices and upload firware to them. */
 376         libusb_get_device_list(usb_context, &devlist);
 377         for (i = 0; devlist[i]; i++) {
 378
 379                 if ((ret = libusb_get_device_descriptor(
 380                      devlist[i], &des)) != 0) {
 381                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 382                         continue;
 383                 }
 384
 385                 prof = NULL;
 386                 for (j = 0; supported_fx2[j].vid; j++) {
 387                         if (des.idVendor == supported_fx2[j].vid &&
 388                                 des.idProduct == supported_fx2[j].pid) {
 389                                 prof = &supported_fx2[j];
 390                         }
 391                 }
 392
 393                 /* Skip if the device was not found */
 394                 if (!prof)
 395                         continue;
 396
 397                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 398                         prof->vendor, prof->model, prof->model_version);
 399                 if (!sdi)
 400                         return 0;
 401
 402                 ctx = fx2lafw_dev_new();
 403                 ctx->profile = prof;
 404                 sdi->priv = ctx;
 405                 dev_insts = g_slist_append(dev_insts, sdi);
 406
 407                 if (check_conf_profile(devlist[i])) {
 408                         /* Already has the firmware, so fix the new address. */
 409                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 410                         sdi->status = SR_ST_INACTIVE;
 411                         ctx->usb = sr_usb_dev_inst_new
 412                             (libusb_get_bus_number(devlist[i]),
 413                              libusb_get_device_address(devlist[i]), NULL);
 414                 } else {
 415                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 416                                 prof->firmware) == SR_OK)
 417                                 /* Remember when the firmware on this device was updated */
 418                                 ctx->fw_updated = g_get_monotonic_time();
 419                         else
 420                                 sr_err("fx2lafw: Firmware upload failed for "
 421                                        "device %d.", devcnt);
 422                         ctx->usb = sr_usb_dev_inst_new
 423                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 424                 }
 425
 426                 devcnt++;
 427         }
 428         libusb_free_device_list(devlist, 1);
 429
 430         return devcnt;
 431 }
 432
 433 static int hw_dev_open(int dev_index)
 434 {
 435         struct sr_dev_inst *sdi;
 436         struct context *ctx;
 437         int ret;
 438         int64_t timediff_us, timediff_ms;
 439
 440         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 441                 return SR_ERR;
 442         ctx = sdi->priv;
 443
 444         /*
 445          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 446          * milliseconds for the FX2 to renumerate.
 447          */
 448         ret = 0;
 449
 450         if (ctx->fw_updated > 0) {
 451                 sr_info("fx2lafw: Waiting for device to reset.");
 452                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 453                 g_usleep(300 * 1000);
 454                 timediff_ms = 0;
 455                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 456                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 457                                 break;
 458                         g_usleep(100 * 1000);
 459
 460                         timediff_us = g_get_monotonic_time() - ctx->fw_updated;
 461                         timediff_ms = timediff_us / G_USEC_PER_SEC;
 462                         sr_spew("fx2lafw: timediff: %" PRIi64 " us.",
 463                                 timediff_us);
 464                 }
 465                 sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
 466         } else {
 467                 ret = fx2lafw_dev_open(dev_index);
 468         }
 469
 470         if (ret != SR_OK) {
 471                 sr_err("fx2lafw: Unable to open device.");
 472                 return SR_ERR;
 473         }
 474         ctx = sdi->priv;
 475
 476         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 477         if (ret != 0) {
 478                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 479                 return SR_ERR;
 480         }
 481
 482         if (ctx->cur_samplerate == 0) {
 483                 /* Samplerate hasn't been set; default to the slowest one. */
 484                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 485                     &supported_samplerates[0]) == SR_ERR)
 486                         return SR_ERR;
 487         }
 488
 489         return SR_OK;
 490 }
 491
 492 static int hw_dev_close(int dev_index)
 493 {
 494         struct sr_dev_inst *sdi;
 495
 496         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 497                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 498                 return SR_ERR_BUG;
 499         }
 500
 501         /* TODO */
 502         close_dev(sdi);
 503
 504         return SR_OK;
 505 }
 506
 507 static int hw_cleanup(void)
 508 {
 509         GSList *l;
 510         struct sr_dev_inst *sdi;
 511         struct context *ctx;
 512         int ret = SR_OK;
 513
 514         for (l = dev_insts; l; l = l->next) {
 515                 if (!(sdi = l->data)) {
 516                         /* Log error, but continue cleaning up the rest. */
 517                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 518                                __func__);
 519                         ret = SR_ERR_BUG;
 520                         continue;
 521                 }
 522                 if (!(ctx = sdi->priv)) {
 523                         /* Log error, but continue cleaning up the rest. */
 524                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 525                                __func__);
 526                         ret = SR_ERR_BUG;
 527                         continue;
 528                 }
 529                 close_dev(sdi);
 530                 sdi = l->data;
 531                 sr_dev_inst_free(sdi);
 532         }
 533
 534         g_slist_free(dev_insts);
 535         dev_insts = NULL;
 536
 537         if (usb_context)
 538                 libusb_exit(usb_context);
 539         usb_context = NULL;
 540
 541         return ret;
 542 }
 543
 544 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 545 {
 546         struct sr_dev_inst *sdi;
 547         struct context *ctx;
 548
 549         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 550                 return NULL;
 551         ctx = sdi->priv;
 552
 553         switch (dev_info_id) {
 554         case SR_DI_INST:
 555                 return sdi;
 556         case SR_DI_NUM_PROBES:
 557                 return GINT_TO_POINTER(ctx->profile->num_probes);
 558         case SR_DI_PROBE_NAMES:
 559                 return probe_names;
 560         case SR_DI_SAMPLERATES:
 561                 return &samplerates;
 562         case SR_DI_TRIGGER_TYPES:
 563                 return TRIGGER_TYPES;
 564         case SR_DI_CUR_SAMPLERATE:
 565                 return &ctx->cur_samplerate;
 566         }
 567
 568         return NULL;
 569 }
 570
 571 static int hw_dev_status_get(int dev_index)
 572 {
 573         const struct sr_dev_inst *const sdi =
 574                 sr_dev_inst_get(dev_insts, dev_index);
 575
 576         if (!sdi)
 577                 return SR_ST_NOT_FOUND;
 578
 579         return sdi->status;
 580 }
 581
 582 static int *hw_hwcap_get_all(void)
 583 {
 584         return hwcaps;
 585 }
 586
 587 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 588 {
 589         struct sr_dev_inst *sdi;
 590         struct context *ctx;
 591         int ret;
 592
 593         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 594                 return SR_ERR;
 595         ctx = sdi->priv;
 596
 597         if (hwcap == SR_HWCAP_SAMPLERATE) {
 598                 ctx->cur_samplerate = *(uint64_t *)value;
 599                 ret = SR_OK;
 600         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 601                 ret = configure_probes(ctx, (GSList *) value);
 602         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 603                 ctx->limit_samples = *(uint64_t *)value;
 604                 ret = SR_OK;
 605         } else {
 606                 ret = SR_ERR;
 607         }
 608
 609         return ret;
 610 }
 611
 612 static int receive_data(int fd, int revents, void *cb_data)
 613 {
 614         struct timeval tv;
 615
 616         /* Avoid compiler warnings. */
 617         (void)fd;
 618         (void)revents;
 619         (void)cb_data;
 620
 621         tv.tv_sec = tv.tv_usec = 0;
 622         libusb_handle_events_timeout(usb_context, &tv);
 623
 624         return TRUE;
 625 }
 626
 627 static void abort_acquisition(struct context *ctx)
 628 {
 629         ctx->num_samples = -1;
 630 }
 631
 632 static void finish_acquisition(struct context *ctx)
 633 {
 634         struct sr_datafeed_packet packet;
 635         int i;
 636
 637         /* Terminate session */
 638         packet.type = SR_DF_END;
 639         sr_session_send(ctx->session_dev_id, &packet);
 640
 641         /* Remove fds from polling */
 642         const struct libusb_pollfd **const lupfd =
 643                 libusb_get_pollfds(usb_context);
 644         for (i = 0; lupfd[i]; i++)
 645                 sr_source_remove(lupfd[i]->fd);
 646         free(lupfd); /* NOT g_free()! */
 647 }
 648
 649 static void receive_transfer(struct libusb_transfer *transfer)
 650 {
 651         /* TODO: These statics have to move to the ctx struct. */
 652         static int empty_transfer_count = 0;
 653         struct sr_datafeed_packet packet;
 654         struct sr_datafeed_logic logic;
 655         struct context *ctx = transfer->user_data;
 656         int cur_buflen, trigger_offset, i;
 657         unsigned char *cur_buf, *new_buf;
 658
 659         /*
 660          * If acquisition has already ended, just free any queued up
 661          * transfer that come in.
 662          */
 663         if (ctx->num_samples == -1) {
 664                 if (transfer)
 665                         libusb_free_transfer(transfer);
 666
 667                 ctx->submitted_transfers--;
 668                 if (ctx->submitted_transfers == 0)
 669                         finish_acquisition(ctx);
 670
 671                 return;
 672         }
 673
 674         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 675                 transfer->status, transfer->actual_length);
 676
 677         /* Save incoming transfer before reusing the transfer struct. */
 678         cur_buf = transfer->buffer;
 679         cur_buflen = transfer->actual_length;
 680
 681         /* Fire off a new request. */
 682         if (!(new_buf = g_try_malloc(4096))) {
 683                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 684                 return; /* TODO: SR_ERR_MALLOC */
 685         }
 686
 687         transfer->buffer = new_buf;
 688         transfer->length = 4096;
 689         if (libusb_submit_transfer(transfer) != 0) {
 690                 /* TODO: Stop session? */
 691                 /* TODO: Better error message. */
 692                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 693         }
 694
 695         if (cur_buflen == 0) {
 696                 empty_transfer_count++;
 697                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 698                         /*
 699                          * The FX2 gave up. End the acquisition, the frontend
 700                          * will work out that the samplecount is short.
 701                          */
 702                         abort_acquisition(ctx);
 703                 }
 704                 return;
 705         } else {
 706                 empty_transfer_count = 0;
 707         }
 708
 709         trigger_offset = 0;
 710         if (ctx->trigger_stage >= 0) {
 711                 for (i = 0; i < cur_buflen; i++) {
 712
 713                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 714                                 /* Match on this trigger stage. */
 715                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 716                                 ctx->trigger_stage++;
 717
 718                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 719                                         /* Match on all trigger stages, we're done. */
 720                                         trigger_offset = i + 1;
 721
 722                                         /*
 723                                          * TODO: Send pre-trigger buffer to session bus.
 724                                          * Tell the frontend we hit the trigger here.
 725                                          */
 726                                         packet.type = SR_DF_TRIGGER;
 727                                         packet.payload = NULL;
 728                                         sr_session_send(ctx->session_dev_id, &packet);
 729
 730                                         /*
 731                                          * Send the samples that triggered it, since we're
 732                                          * skipping past them.
 733                                          */
 734                                         packet.type = SR_DF_LOGIC;
 735                                         packet.payload = &logic;
 736                                         logic.length = ctx->trigger_stage;
 737                                         logic.unitsize = 1;
 738                                         logic.data = ctx->trigger_buffer;
 739                                         sr_session_send(ctx->session_dev_id, &packet);
 740
 741                                         ctx->trigger_stage = TRIGGER_FIRED;
 742                                         break;
 743                                 }
 744                                 return;
 745                         }
 746
 747                         /*
 748                          * We had a match before, but not in the next sample. However, we may
 749                          * have a match on this stage in the next bit -- trigger on 0001 will
 750                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 751                          * the next sample from the one that matched originally, which the
 752                          * counter increment at the end of the loop takes care of.
 753                          */
 754                         if (ctx->trigger_stage > 0) {
 755                                 i -= ctx->trigger_stage;
 756                                 if (i < -1)
 757                                         i = -1; /* Oops, went back past this buffer. */
 758                                 /* Reset trigger stage. */
 759                                 ctx->trigger_stage = 0;
 760                         }
 761                 }
 762         }
 763
 764         if (ctx->trigger_stage == TRIGGER_FIRED) {
 765                 /* Send the incoming transfer to the session bus. */
 766                 packet.type = SR_DF_LOGIC;
 767                 packet.payload = &logic;
 768                 logic.length = cur_buflen - trigger_offset;
 769                 logic.unitsize = 1;
 770                 logic.data = cur_buf + trigger_offset;
 771                 sr_session_send(ctx->session_dev_id, &packet);
 772                 g_free(cur_buf);
 773
 774                 ctx->num_samples += cur_buflen;
 775                 if (ctx->limit_samples &&
 776                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 777                         abort_acquisition(ctx);
 778                 }
 779         } else {
 780                 /*
 781                  * TODO: Buffer pre-trigger data in capture
 782                  * ratio-sized buffer.
 783                  */
 784         }
 785 }
 786
 787 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 788 {
 789         struct sr_dev_inst *sdi;
 790         struct sr_datafeed_packet *packet;
 791         struct sr_datafeed_header *header;
 792         struct context *ctx;
 793         struct libusb_transfer *transfer;
 794         const struct libusb_pollfd **lupfd;
 795         int ret, size, i;
 796         unsigned char *buf;
 797
 798         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 799                 return SR_ERR;
 800         ctx = sdi->priv;
 801         ctx->session_dev_id = cb_data;
 802         ctx->num_samples = 0;
 803
 804         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 805                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 806                 return SR_ERR_MALLOC;
 807         }
 808
 809         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 810                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 811                 return SR_ERR_MALLOC;
 812         }
 813
 814         /* Start with 2K transfer, subsequently increased to 4K. */
 815         size = 2048;
 816         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 817                 if (!(buf = g_try_malloc(size))) {
 818                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 819                         return SR_ERR_MALLOC;
 820                 }
 821                 transfer = libusb_alloc_transfer(0);
 822                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 823                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 824                                 receive_transfer, ctx, 40);
 825                 if (libusb_submit_transfer(transfer) != 0) {
 826                         /* TODO: Free them all. */
 827                         libusb_free_transfer(transfer);
 828                         g_free(buf);
 829                         return SR_ERR;
 830                 }
 831
 832                 ctx->submitted_transfers++;
 833                 size = 4096;
 834         }
 835
 836         lupfd = libusb_get_pollfds(usb_context);
 837         for (i = 0; lupfd[i]; i++)
 838                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 839                               40, receive_data, NULL);
 840         free(lupfd); /* NOT g_free()! */
 841
 842         packet->type = SR_DF_HEADER;
 843         packet->payload = header;
 844         header->feed_version = 1;
 845         gettimeofday(&header->starttime, NULL);
 846         header->samplerate = ctx->cur_samplerate;
 847         header->num_logic_probes = ctx->profile->num_probes;
 848         sr_session_send(cb_data, packet);
 849         g_free(header);
 850         g_free(packet);
 851
 852         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 853                 ctx->cur_samplerate)) != SR_OK) {
 854                 return ret;
 855         }
 856
 857         return SR_OK;
 858 }
 859
 860 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 861 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 862 {
 863         struct sr_dev_inst *sdi;
 864
 865         /* Avoid compiler warnings. */
 866         (void)cb_data;
 867
 868         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 869                 return SR_ERR;
 870
 871         abort_acquisition(sdi->priv);
 872
 873         return SR_OK;
 874 }
 875
 876 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 877         .name = "fx2lafw",
 878         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 879         .api_version = 1,
 880         .init = hw_init,
 881         .cleanup = hw_cleanup,
 882         .dev_open = hw_dev_open,
 883         .dev_close = hw_dev_close,
 884         .dev_info_get = hw_dev_info_get,
 885         .dev_status_get = hw_dev_status_get,
 886         .hwcap_get_all = hw_hwcap_get_all,
 887         .dev_config_set = hw_dev_config_set,
 888         .dev_acquisition_start = hw_dev_acquisition_start,
 889         .dev_acquisition_stop = hw_dev_acquisition_stop,
 890 };