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          */
  36         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  37                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  38
  39         /*
  40          * CWAV USBee SX
  41          */
  42         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  43                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  44
  45         /*
  46          * Saleae Logic
  47          * EE Electronics ESLA100
  48          * Robomotic MiniLogic
  49          * Robomotic BugLogic 3
  50          */
  51         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  52                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  53
  54         /*
  55          * Default Cypress FX2 without EEPROM, e.g.:
  56          * Lcsoft Mini Board
  57          * Braintechnology USB Interface V2.x
  58          */
  59         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  60                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  61
  62         /*
  63          * Braintechnology USB-LPS
  64          */
  65         { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
  66                 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw", 8 },
  67
  68         { 0, 0, 0, 0, 0, 0, 0 }
  69 };
  70
  71 static int hwcaps[] = {
  72         SR_HWCAP_LOGIC_ANALYZER,
  73         SR_HWCAP_SAMPLERATE,
  74
  75         /* These are really implemented in the driver, not the hardware. */
  76         SR_HWCAP_LIMIT_SAMPLES,
  77         SR_HWCAP_CONTINUOUS,
  78         0,
  79 };
  80
  81 /*
  82  * TODO: Different probe_names[] for each supported device.
  83  */
  84 static const char *probe_names[] = {
  85         "0",
  86         "1",
  87         "2",
  88         "3",
  89         "4",
  90         "5",
  91         "6",
  92         "7",
  93         NULL,
  94 };
  95
  96 static uint64_t supported_samplerates[] = {
  97         SR_KHZ(20),
  98         SR_KHZ(25),
  99         SR_KHZ(50),
 100         SR_KHZ(100),
 101         SR_KHZ(200),
 102         SR_KHZ(250),
 103         SR_KHZ(500),
 104         SR_MHZ(1),
 105         SR_MHZ(2),
 106         SR_MHZ(3),
 107         SR_MHZ(4),
 108         SR_MHZ(6),
 109         SR_MHZ(8),
 110         SR_MHZ(12),
 111         SR_MHZ(16),
 112         SR_MHZ(24),
 113         0,
 114 };
 115
 116 static struct sr_samplerates samplerates = {
 117         0,
 118         0,
 119         0,
 120         supported_samplerates,
 121 };
 122
 123 static GSList *dev_insts = NULL;
 124 static libusb_context *usb_context = NULL;
 125
 126 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 127 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 128
 129 /**
 130  * Check the USB configuration to determine if this is an fx2lafw device.
 131  *
 132  * @return TRUE if the device's configuration profile match fx2lafw
 133  *         configuration, FALSE otherwise.
 134  */
 135 static gboolean check_conf_profile(libusb_device *dev)
 136 {
 137         struct libusb_device_descriptor des;
 138         struct libusb_device_handle *hdl;
 139         gboolean ret;
 140         unsigned char strdesc[64];
 141
 142         hdl = NULL;
 143         ret = FALSE;
 144         while (!ret) {
 145                 /* Assume the FW has not been loaded, unless proven wrong. */
 146                 if (libusb_get_device_descriptor(dev, &des) != 0)
 147                         break;
 148
 149                 if (libusb_open(dev, &hdl) != 0)
 150                         break;
 151
 152                 if (libusb_get_string_descriptor_ascii(hdl,
 153                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 154                         break;
 155                 if (strncmp((const char *)strdesc, "sigrok", 6))
 156                         break;
 157
 158                 if (libusb_get_string_descriptor_ascii(hdl,
 159                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 160                         break;
 161                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 162                         break;
 163
 164                 /* If we made it here, it must be an fx2lafw. */
 165                 ret = TRUE;
 166         }
 167         if (hdl)
 168                 libusb_close(hdl);
 169
 170         return ret;
 171 }
 172
 173 static int fx2lafw_dev_open(int dev_index)
 174 {
 175         libusb_device **devlist;
 176         struct libusb_device_descriptor des;
 177         struct sr_dev_inst *sdi;
 178         struct context *ctx;
 179         struct version_info vi;
 180         int ret, skip, i;
 181         uint8_t revid;
 182
 183         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 184                 return SR_ERR;
 185         ctx = sdi->priv;
 186
 187         if (sdi->status == SR_ST_ACTIVE)
 188                 /* already in use */
 189                 return SR_ERR;
 190
 191         skip = 0;
 192         const int device_count = libusb_get_device_list(usb_context, &devlist);
 193         if (device_count < 0) {
 194                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 195                         device_count);
 196                 return SR_ERR;
 197         }
 198
 199         for (i = 0; i < device_count; i++) {
 200                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 201                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 202                                ret);
 203                         continue;
 204                 }
 205
 206                 if (des.idVendor != ctx->profile->vid
 207                     || des.idProduct != ctx->profile->pid)
 208                         continue;
 209
 210                 if (sdi->status == SR_ST_INITIALIZING) {
 211                         if (skip != dev_index) {
 212                                 /* Skip devices of this type that aren't the one we want. */
 213                                 skip += 1;
 214                                 continue;
 215                         }
 216                 } else if (sdi->status == SR_ST_INACTIVE) {
 217                         /*
 218                          * This device is fully enumerated, so we need to find
 219                          * this device by vendor, product, bus and address.
 220                          */
 221                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 222                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 223                                 /* this is not the one */
 224                                 continue;
 225                 }
 226
 227                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 228                         if (ctx->usb->address == 0xff)
 229                                 /*
 230                                  * first time we touch this device after firmware upload,
 231                                  * so we don't know the address yet.
 232                                  */
 233                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 234                 } else {
 235                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 236                         break;
 237                 }
 238
 239                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 240                 if (ret != SR_OK) {
 241                         sr_err("fx2lafw: Failed to retrieve "
 242                                "firmware version information.");
 243                         break;
 244                 }
 245
 246                 ret = command_get_revid_version(ctx->usb->devhdl, &revid);
 247                 if (ret != SR_OK) {
 248                         sr_err("fx2lafw: Failed to retrieve REVID.");
 249                         break;
 250                 }
 251
 252                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 253                     vi.minor != FX2LAFW_VERSION_MINOR) {
 254                         sr_err("fx2lafw: Expected firmware version %d.%d "
 255                                "got %d.%d.", FX2LAFW_VERSION_MAJOR,
 256                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 257                         break;
 258                 }
 259
 260                 sdi->status = SR_ST_ACTIVE;
 261                 sr_info("fx2lafw: Opened device %d on %d.%d "
 262                         "interface %d, firmware %d.%d, REVID %d.",
 263                         sdi->index, ctx->usb->bus, ctx->usb->address,
 264                         USB_INTERFACE, vi.major, vi.minor, revid);
 265
 266                 break;
 267         }
 268         libusb_free_device_list(devlist, 1);
 269
 270         if (sdi->status != SR_ST_ACTIVE)
 271                 return SR_ERR;
 272
 273         return SR_OK;
 274 }
 275
 276 static void close_dev(struct sr_dev_inst *sdi)
 277 {
 278         struct context *ctx;
 279
 280         ctx = sdi->priv;
 281
 282         if (ctx->usb->devhdl == NULL)
 283                 return;
 284
 285         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 286                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 287         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 288         libusb_close(ctx->usb->devhdl);
 289         ctx->usb->devhdl = NULL;
 290         sdi->status = SR_ST_INACTIVE;
 291 }
 292
 293 static int configure_probes(struct context *ctx, GSList *probes)
 294 {
 295         struct sr_probe *probe;
 296         GSList *l;
 297         int probe_bit, stage, i;
 298         char *tc;
 299
 300         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 301                 ctx->trigger_mask[i] = 0;
 302                 ctx->trigger_value[i] = 0;
 303         }
 304
 305         stage = -1;
 306         for (l = probes; l; l = l->next) {
 307                 probe = (struct sr_probe *)l->data;
 308                 if (probe->enabled == FALSE)
 309                         continue;
 310                 probe_bit = 1 << (probe->index - 1);
 311                 if (!(probe->trigger))
 312                         continue;
 313
 314                 stage = 0;
 315                 for (tc = probe->trigger; *tc; tc++) {
 316                         ctx->trigger_mask[stage] |= probe_bit;
 317                         if (*tc == '1')
 318                                 ctx->trigger_value[stage] |= probe_bit;
 319                         stage++;
 320                         if (stage > NUM_TRIGGER_STAGES)
 321                                 return SR_ERR;
 322                 }
 323         }
 324
 325         if (stage == -1)
 326                 /*
 327                  * We didn't configure any triggers, make sure acquisition
 328                  * doesn't wait for any.
 329                  */
 330                 ctx->trigger_stage = TRIGGER_FIRED;
 331         else
 332                 ctx->trigger_stage = 0;
 333
 334         return SR_OK;
 335 }
 336
 337 static struct context *fx2lafw_dev_new(void)
 338 {
 339         struct context *ctx;
 340
 341         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 342                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 343                 return NULL;
 344         }
 345
 346         ctx->trigger_stage = TRIGGER_FIRED;
 347
 348         return ctx;
 349 }
 350
 351 /*
 352  * API callbacks
 353  */
 354
 355 static int hw_init(const char *devinfo)
 356 {
 357         struct sr_dev_inst *sdi;
 358         struct libusb_device_descriptor des;
 359         const struct fx2lafw_profile *prof;
 360         struct context *ctx;
 361         libusb_device **devlist;
 362         int ret;
 363         int devcnt = 0;
 364         int i, j;
 365
 366         /* Avoid compiler warnings. */
 367         (void)devinfo;
 368
 369         if (libusb_init(&usb_context) != 0) {
 370                 sr_warn("fx2lafw: Failed to initialize libusb.");
 371                 return 0;
 372         }
 373
 374         /* Find all fx2lafw compatible devices and upload firware to them. */
 375         libusb_get_device_list(usb_context, &devlist);
 376         for (i = 0; devlist[i]; i++) {
 377
 378                 if ((ret = libusb_get_device_descriptor(
 379                      devlist[i], &des)) != 0) {
 380                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 381                         continue;
 382                 }
 383
 384                 prof = NULL;
 385                 for (j = 0; supported_fx2[j].vid; j++) {
 386                         if (des.idVendor == supported_fx2[j].vid &&
 387                                 des.idProduct == supported_fx2[j].pid) {
 388                                 prof = &supported_fx2[j];
 389                         }
 390                 }
 391
 392                 /* Skip if the device was not found */
 393                 if (!prof)
 394                         continue;
 395
 396                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 397                         prof->vendor, prof->model, prof->model_version);
 398                 if (!sdi)
 399                         return 0;
 400
 401                 ctx = fx2lafw_dev_new();
 402                 ctx->profile = prof;
 403                 sdi->priv = ctx;
 404                 dev_insts = g_slist_append(dev_insts, sdi);
 405
 406                 if (check_conf_profile(devlist[i])) {
 407                         /* Already has the firmware, so fix the new address. */
 408                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 409                         sdi->status = SR_ST_INACTIVE;
 410                         ctx->usb = sr_usb_dev_inst_new
 411                             (libusb_get_bus_number(devlist[i]),
 412                              libusb_get_device_address(devlist[i]), NULL);
 413                 } else {
 414                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 415                                 prof->firmware) == SR_OK)
 416                                 /* Remember when the firmware on this device was updated */
 417                                 g_get_current_time(&ctx->fw_updated);
 418                         else
 419                                 sr_err("fx2lafw: Firmware upload failed for "
 420                                        "device %d.", devcnt);
 421                         ctx->usb = sr_usb_dev_inst_new
 422                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 423                 }
 424
 425                 devcnt++;
 426         }
 427         libusb_free_device_list(devlist, 1);
 428
 429         return devcnt;
 430 }
 431
 432 static int hw_dev_open(int dev_index)
 433 {
 434         GTimeVal cur_time;
 435         struct sr_dev_inst *sdi;
 436         struct context *ctx;
 437         int timediff, ret;
 438
 439         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 440                 return SR_ERR;
 441         ctx = sdi->priv;
 442
 443         /*
 444          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 445          * for the FX2 to renumerate.
 446          */
 447         ret = 0;
 448         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 449                 sr_info("fx2lafw: Waiting for device to reset.");
 450                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 451                 g_usleep(300 * 1000);
 452                 timediff = 0;
 453                 while (timediff < MAX_RENUM_DELAY) {
 454                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 455                                 break;
 456                         g_usleep(100 * 1000);
 457                         g_get_current_time(&cur_time);
 458                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 459                 }
 460                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 461         } else {
 462                 ret = fx2lafw_dev_open(dev_index);
 463         }
 464
 465         if (ret != SR_OK) {
 466                 sr_err("fx2lafw: Unable to open device.");
 467                 return SR_ERR;
 468         }
 469         ctx = sdi->priv;
 470
 471         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 472         if (ret != 0) {
 473                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 474                 return SR_ERR;
 475         }
 476
 477         if (ctx->cur_samplerate == 0) {
 478                 /* Samplerate hasn't been set; default to the slowest one. */
 479                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 480                     &supported_samplerates[0]) == SR_ERR)
 481                         return SR_ERR;
 482         }
 483
 484         return SR_OK;
 485 }
 486
 487 static int hw_dev_close(int dev_index)
 488 {
 489         struct sr_dev_inst *sdi;
 490
 491         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 492                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 493                 return SR_ERR_BUG;
 494         }
 495
 496         /* TODO */
 497         close_dev(sdi);
 498
 499         return SR_OK;
 500 }
 501
 502 static int hw_cleanup(void)
 503 {
 504         GSList *l;
 505         struct sr_dev_inst *sdi;
 506         struct context *ctx;
 507         int ret = SR_OK;
 508
 509         for (l = dev_insts; l; l = l->next) {
 510                 if (!(sdi = l->data)) {
 511                         /* Log error, but continue cleaning up the rest. */
 512                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 513                                __func__);
 514                         ret = SR_ERR_BUG;
 515                         continue;
 516                 }
 517                 if (!(ctx = sdi->priv)) {
 518                         /* Log error, but continue cleaning up the rest. */
 519                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 520                                __func__);
 521                         ret = SR_ERR_BUG;
 522                         continue;
 523                 }
 524                 close_dev(sdi);
 525                 sdi = l->data;
 526                 sr_dev_inst_free(sdi);
 527         }
 528
 529         g_slist_free(dev_insts);
 530         dev_insts = NULL;
 531
 532         if (usb_context)
 533                 libusb_exit(usb_context);
 534         usb_context = NULL;
 535
 536         return ret;
 537 }
 538
 539 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 540 {
 541         struct sr_dev_inst *sdi;
 542         struct context *ctx;
 543
 544         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 545                 return NULL;
 546         ctx = sdi->priv;
 547
 548         switch (dev_info_id) {
 549         case SR_DI_INST:
 550                 return sdi;
 551         case SR_DI_NUM_PROBES:
 552                 return GINT_TO_POINTER(ctx->profile->num_probes);
 553         case SR_DI_PROBE_NAMES:
 554                 return probe_names;
 555         case SR_DI_SAMPLERATES:
 556                 return &samplerates;
 557         case SR_DI_TRIGGER_TYPES:
 558                 return TRIGGER_TYPES;
 559         case SR_DI_CUR_SAMPLERATE:
 560                 return &ctx->cur_samplerate;
 561         }
 562
 563         return NULL;
 564 }
 565
 566 static int hw_dev_status_get(int dev_index)
 567 {
 568         const struct sr_dev_inst *const sdi =
 569                 sr_dev_inst_get(dev_insts, dev_index);
 570
 571         if (!sdi)
 572                 return SR_ST_NOT_FOUND;
 573
 574         return sdi->status;
 575 }
 576
 577 static int *hw_hwcap_get_all(void)
 578 {
 579         return hwcaps;
 580 }
 581
 582 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 583 {
 584         struct sr_dev_inst *sdi;
 585         struct context *ctx;
 586         int ret;
 587
 588         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 589                 return SR_ERR;
 590         ctx = sdi->priv;
 591
 592         if (hwcap == SR_HWCAP_SAMPLERATE) {
 593                 ctx->cur_samplerate = *(uint64_t *)value;
 594                 ret = SR_OK;
 595         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 596                 ret = configure_probes(ctx, (GSList *) value);
 597         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 598                 ctx->limit_samples = *(uint64_t *)value;
 599                 ret = SR_OK;
 600         } else {
 601                 ret = SR_ERR;
 602         }
 603
 604         return ret;
 605 }
 606
 607 static int receive_data(int fd, int revents, void *cb_data)
 608 {
 609         struct timeval tv;
 610
 611         /* Avoid compiler warnings. */
 612         (void)fd;
 613         (void)revents;
 614         (void)cb_data;
 615
 616         tv.tv_sec = tv.tv_usec = 0;
 617         libusb_handle_events_timeout(usb_context, &tv);
 618
 619         return TRUE;
 620 }
 621
 622 static void abort_acquisition(struct context *ctx)
 623 {
 624         ctx->num_samples = -1;
 625 }
 626
 627 static void finish_acquisition(struct context *ctx)
 628 {
 629         struct sr_datafeed_packet packet;
 630         int i;
 631
 632         /* Terminate session */
 633         packet.type = SR_DF_END;
 634         sr_session_send(ctx->session_dev_id, &packet);
 635
 636         /* Remove fds from polling */
 637         const struct libusb_pollfd **const lupfd =
 638                 libusb_get_pollfds(usb_context);
 639         for (i = 0; lupfd[i]; i++)
 640                 sr_source_remove(lupfd[i]->fd);
 641         free(lupfd); /* NOT g_free()! */
 642 }
 643
 644 static void receive_transfer(struct libusb_transfer *transfer)
 645 {
 646         /* TODO: These statics have to move to the ctx struct. */
 647         static int empty_transfer_count = 0;
 648         struct sr_datafeed_packet packet;
 649         struct sr_datafeed_logic logic;
 650         struct context *ctx = transfer->user_data;
 651         int cur_buflen, trigger_offset, i;
 652         unsigned char *cur_buf, *new_buf;
 653
 654         /*
 655          * If acquisition has already ended, just free any queued up
 656          * transfer that come in.
 657          */
 658         if (ctx->num_samples == -1) {
 659                 if (transfer)
 660                         libusb_free_transfer(transfer);
 661
 662                 ctx->submitted_transfers--;
 663                 if (ctx->submitted_transfers == 0)
 664                         finish_acquisition(ctx);
 665
 666                 return;
 667         }
 668
 669         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 670                 transfer->status, transfer->actual_length);
 671
 672         /* Save incoming transfer before reusing the transfer struct. */
 673         cur_buf = transfer->buffer;
 674         cur_buflen = transfer->actual_length;
 675
 676         /* Fire off a new request. */
 677         if (!(new_buf = g_try_malloc(4096))) {
 678                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 679                 return; /* TODO: SR_ERR_MALLOC */
 680         }
 681
 682         transfer->buffer = new_buf;
 683         transfer->length = 4096;
 684         if (libusb_submit_transfer(transfer) != 0) {
 685                 /* TODO: Stop session? */
 686                 /* TODO: Better error message. */
 687                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 688         }
 689
 690         if (cur_buflen == 0) {
 691                 empty_transfer_count++;
 692                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 693                         /*
 694                          * The FX2 gave up. End the acquisition, the frontend
 695                          * will work out that the samplecount is short.
 696                          */
 697                         abort_acquisition(ctx);
 698                 }
 699                 return;
 700         } else {
 701                 empty_transfer_count = 0;
 702         }
 703
 704         trigger_offset = 0;
 705         if (ctx->trigger_stage >= 0) {
 706                 for (i = 0; i < cur_buflen; i++) {
 707
 708                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 709                                 /* Match on this trigger stage. */
 710                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 711                                 ctx->trigger_stage++;
 712
 713                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 714                                         /* Match on all trigger stages, we're done. */
 715                                         trigger_offset = i + 1;
 716
 717                                         /*
 718                                          * TODO: Send pre-trigger buffer to session bus.
 719                                          * Tell the frontend we hit the trigger here.
 720                                          */
 721                                         packet.type = SR_DF_TRIGGER;
 722                                         packet.payload = NULL;
 723                                         sr_session_send(ctx->session_dev_id, &packet);
 724
 725                                         /*
 726                                          * Send the samples that triggered it, since we're
 727                                          * skipping past them.
 728                                          */
 729                                         packet.type = SR_DF_LOGIC;
 730                                         packet.payload = &logic;
 731                                         logic.length = ctx->trigger_stage;
 732                                         logic.unitsize = 1;
 733                                         logic.data = ctx->trigger_buffer;
 734                                         sr_session_send(ctx->session_dev_id, &packet);
 735
 736                                         ctx->trigger_stage = TRIGGER_FIRED;
 737                                         break;
 738                                 }
 739                                 return;
 740                         }
 741
 742                         /*
 743                          * We had a match before, but not in the next sample. However, we may
 744                          * have a match on this stage in the next bit -- trigger on 0001 will
 745                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 746                          * the next sample from the one that matched originally, which the
 747                          * counter increment at the end of the loop takes care of.
 748                          */
 749                         if (ctx->trigger_stage > 0) {
 750                                 i -= ctx->trigger_stage;
 751                                 if (i < -1)
 752                                         i = -1; /* Oops, went back past this buffer. */
 753                                 /* Reset trigger stage. */
 754                                 ctx->trigger_stage = 0;
 755                         }
 756                 }
 757         }
 758
 759         if (ctx->trigger_stage == TRIGGER_FIRED) {
 760                 /* Send the incoming transfer to the session bus. */
 761                 packet.type = SR_DF_LOGIC;
 762                 packet.payload = &logic;
 763                 logic.length = cur_buflen - trigger_offset;
 764                 logic.unitsize = 1;
 765                 logic.data = cur_buf + trigger_offset;
 766                 sr_session_send(ctx->session_dev_id, &packet);
 767                 g_free(cur_buf);
 768
 769                 ctx->num_samples += cur_buflen;
 770                 if (ctx->limit_samples &&
 771                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 772                         abort_acquisition(ctx);
 773                 }
 774         } else {
 775                 /*
 776                  * TODO: Buffer pre-trigger data in capture
 777                  * ratio-sized buffer.
 778                  */
 779         }
 780 }
 781
 782 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 783 {
 784         struct sr_dev_inst *sdi;
 785         struct sr_datafeed_packet *packet;
 786         struct sr_datafeed_header *header;
 787         struct context *ctx;
 788         struct libusb_transfer *transfer;
 789         const struct libusb_pollfd **lupfd;
 790         int ret, size, i;
 791         unsigned char *buf;
 792
 793         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 794                 return SR_ERR;
 795         ctx = sdi->priv;
 796         ctx->session_dev_id = cb_data;
 797         ctx->num_samples = 0;
 798
 799         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 800                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 801                 return SR_ERR_MALLOC;
 802         }
 803
 804         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 805                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 806                 return SR_ERR_MALLOC;
 807         }
 808
 809         /* Start with 2K transfer, subsequently increased to 4K. */
 810         size = 2048;
 811         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 812                 if (!(buf = g_try_malloc(size))) {
 813                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 814                         return SR_ERR_MALLOC;
 815                 }
 816                 transfer = libusb_alloc_transfer(0);
 817                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 818                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 819                                 receive_transfer, ctx, 40);
 820                 if (libusb_submit_transfer(transfer) != 0) {
 821                         /* TODO: Free them all. */
 822                         libusb_free_transfer(transfer);
 823                         g_free(buf);
 824                         return SR_ERR;
 825                 }
 826
 827                 ctx->submitted_transfers++;
 828                 size = 4096;
 829         }
 830
 831         lupfd = libusb_get_pollfds(usb_context);
 832         for (i = 0; lupfd[i]; i++)
 833                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 834                               40, receive_data, NULL);
 835         free(lupfd); /* NOT g_free()! */
 836
 837         packet->type = SR_DF_HEADER;
 838         packet->payload = header;
 839         header->feed_version = 1;
 840         gettimeofday(&header->starttime, NULL);
 841         header->samplerate = ctx->cur_samplerate;
 842         header->num_logic_probes = ctx->profile->num_probes;
 843         sr_session_send(cb_data, packet);
 844         g_free(header);
 845         g_free(packet);
 846
 847         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 848                 ctx->cur_samplerate)) != SR_OK) {
 849                 return ret;
 850         }
 851
 852         return SR_OK;
 853 }
 854
 855 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 856 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 857 {
 858         struct sr_dev_inst *sdi;
 859
 860         /* Avoid compiler warnings. */
 861         (void)cb_data;
 862
 863         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 864                 return SR_ERR;
 865
 866         abort_acquisition(sdi->priv);
 867
 868         return SR_OK;
 869 }
 870
 871 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 872         .name = "fx2lafw",
 873         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 874         .api_version = 1,
 875         .init = hw_init,
 876         .cleanup = hw_cleanup,
 877         .dev_open = hw_dev_open,
 878         .dev_close = hw_dev_close,
 879         .dev_info_get = hw_dev_info_get,
 880         .dev_status_get = hw_dev_status_get,
 881         .hwcap_get_all = hw_hwcap_get_all,
 882         .dev_config_set = hw_dev_config_set,
 883         .dev_acquisition_start = hw_dev_acquisition_start,
 884         .dev_acquisition_stop = hw_dev_acquisition_stop,
 885 };