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 <inttypes.h>
  23 #include <glib.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          */
  50         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  51                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  52
  53         { 0, 0, 0, 0, 0, 0, 0 }
  54 };
  55
  56 static int hwcaps[] = {
  57         SR_HWCAP_LOGIC_ANALYZER,
  58         SR_HWCAP_SAMPLERATE,
  59
  60         /* These are really implemented in the driver, not the hardware. */
  61         SR_HWCAP_LIMIT_SAMPLES,
  62         SR_HWCAP_CONTINUOUS,
  63         0,
  64 };
  65
  66 /*
  67  * TODO: Different probe_names[] for each supported device.
  68  */
  69 static const char *probe_names[] = {
  70         "0",
  71         "1",
  72         "2",
  73         "3",
  74         "4",
  75         "5",
  76         "6",
  77         "7",
  78         NULL,
  79 };
  80
  81 static uint64_t supported_samplerates[] = {
  82         SR_MHZ(1),
  83         SR_MHZ(2),
  84         SR_MHZ(3),
  85         SR_MHZ(4),
  86         SR_MHZ(6),
  87         SR_MHZ(8),
  88         SR_MHZ(12),
  89         SR_MHZ(16),
  90         SR_MHZ(24),
  91 };
  92
  93 static struct sr_samplerates samplerates = {
  94         0,
  95         0,
  96         0,
  97         supported_samplerates,
  98 };
  99
 100 static GSList *dev_insts = NULL;
 101 static libusb_context *usb_context = NULL;
 102
 103 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 104 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 105
 106 /**
 107  * Check the USB configuration to determine if this is an fx2lafw device.
 108  *
 109  * @return TRUE if the device's configuration profile match fx2lafw
 110  *         configuration, FALSE otherwise.
 111  */
 112 static gboolean check_conf_profile(libusb_device *dev)
 113 {
 114         struct libusb_device_descriptor des;
 115         struct libusb_config_descriptor *conf_dsc = NULL;
 116         const struct libusb_interface_descriptor *intf_dsc;
 117         gboolean ret = FALSE;
 118
 119         while (!ret) {
 120                 /* Assume the FW has not been loaded, unless proven wrong. */
 121                 ret = FALSE;
 122
 123                 if (libusb_get_device_descriptor(dev, &des) != 0)
 124                         break;
 125
 126                 /* Need exactly 1 configuration. */
 127                 if (des.bNumConfigurations != 1)
 128                         break;
 129
 130                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 131                         break;
 132
 133                 /* Need exactly 1 interface. */
 134                 if (conf_dsc->bNumInterfaces != 1)
 135                         break;
 136
 137                 /* Need just one alternate setting. */
 138                 if (conf_dsc->interface[0].num_altsetting != 1)
 139                         break;
 140
 141                 /* Need exactly 2 endpoints. */
 142                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 143                 if (intf_dsc->bNumEndpoints != 2)
 144                         break;
 145
 146                 /* The first endpoint should be 2 (inbound). */
 147                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 148                     (2 | LIBUSB_ENDPOINT_IN))
 149                         break;
 150
 151                 /* If we made it here, it must be an fx2lafw. */
 152                 ret = TRUE;
 153         }
 154
 155         if (conf_dsc)
 156                 libusb_free_config_descriptor(conf_dsc);
 157
 158         return ret;
 159 }
 160
 161 static int fx2lafw_dev_open(int dev_index)
 162 {
 163         libusb_device **devlist;
 164         struct libusb_device_descriptor des;
 165         struct sr_dev_inst *sdi;
 166         struct context *ctx;
 167         int ret, skip, i;
 168
 169         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 170                 return SR_ERR;
 171         ctx = sdi->priv;
 172
 173         if (sdi->status == SR_ST_ACTIVE)
 174                 /* already in use */
 175                 return SR_ERR;
 176
 177         skip = 0;
 178         const int device_count = libusb_get_device_list(usb_context, &devlist);
 179         if (device_count < 0) {
 180                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 181                         device_count);
 182                 return SR_ERR;
 183         }
 184
 185         for (i = 0; i < device_count; i++) {
 186                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 187                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 188                                ret);
 189                         continue;
 190                 }
 191
 192                 if (des.idVendor != ctx->profile->vid
 193                     || des.idProduct != ctx->profile->pid)
 194                         continue;
 195
 196                 if (sdi->status == SR_ST_INITIALIZING) {
 197                         if (skip != dev_index) {
 198                                 /* Skip devices of this type that aren't the one we want. */
 199                                 skip += 1;
 200                                 continue;
 201                         }
 202                 } else if (sdi->status == SR_ST_INACTIVE) {
 203                         /*
 204                          * This device is fully enumerated, so we need to find
 205                          * this device by vendor, product, bus and address.
 206                          */
 207                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 208                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 209                                 /* this is not the one */
 210                                 continue;
 211                 }
 212
 213                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 214                         if (ctx->usb->address == 0xff)
 215                                 /*
 216                                  * first time we touch this device after firmware upload,
 217                                  * so we don't know the address yet.
 218                                  */
 219                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 220
 221                         sdi->status = SR_ST_ACTIVE;
 222                         sr_info("fx2lafw: Opened device %d on %d.%d "
 223                                 "interface %d.", sdi->index, ctx->usb->bus,
 224                                 ctx->usb->address, USB_INTERFACE);
 225                 } else {
 226                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 227                 }
 228
 229                 /* if we made it here, we handled the device one way or another */
 230                 break;
 231         }
 232         libusb_free_device_list(devlist, 1);
 233
 234         if (sdi->status != SR_ST_ACTIVE)
 235                 return SR_ERR;
 236
 237         return SR_OK;
 238 }
 239
 240 static void close_dev(struct sr_dev_inst *sdi)
 241 {
 242         struct context *ctx;
 243
 244         ctx = sdi->priv;
 245
 246         if (ctx->usb->devhdl == NULL)
 247                 return;
 248
 249         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 250                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 251         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 252         libusb_close(ctx->usb->devhdl);
 253         ctx->usb->devhdl = NULL;
 254         sdi->status = SR_ST_INACTIVE;
 255 }
 256
 257 static int configure_probes(struct context *ctx, GSList *probes)
 258 {
 259         struct sr_probe *probe;
 260         GSList *l;
 261         int probe_bit, stage, i;
 262         char *tc;
 263
 264         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 265                 ctx->trigger_mask[i] = 0;
 266                 ctx->trigger_value[i] = 0;
 267         }
 268
 269         stage = -1;
 270         for (l = probes; l; l = l->next) {
 271                 probe = (struct sr_probe *)l->data;
 272                 if (probe->enabled == FALSE)
 273                         continue;
 274                 probe_bit = 1 << (probe->index - 1);
 275                 if (!(probe->trigger))
 276                         continue;
 277
 278                 stage = 0;
 279                 for (tc = probe->trigger; *tc; tc++) {
 280                         ctx->trigger_mask[stage] |= probe_bit;
 281                         if (*tc == '1')
 282                                 ctx->trigger_value[stage] |= probe_bit;
 283                         stage++;
 284                         if (stage > NUM_TRIGGER_STAGES)
 285                                 return SR_ERR;
 286                 }
 287         }
 288
 289         if (stage == -1)
 290                 /*
 291                  * We didn't configure any triggers, make sure acquisition
 292                  * doesn't wait for any.
 293                  */
 294                 ctx->trigger_stage = TRIGGER_FIRED;
 295         else
 296                 ctx->trigger_stage = 0;
 297
 298         return SR_OK;
 299 }
 300
 301 static struct context *fx2lafw_dev_new(void)
 302 {
 303         struct context *ctx;
 304
 305         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 306                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 307                 return NULL;
 308         }
 309
 310         ctx->trigger_stage = TRIGGER_FIRED;
 311
 312         return ctx;
 313 }
 314
 315 /*
 316  * API callbacks
 317  */
 318
 319 static int hw_init(const char *devinfo)
 320 {
 321         struct sr_dev_inst *sdi;
 322         struct libusb_device_descriptor des;
 323         const struct fx2lafw_profile *prof;
 324         struct context *ctx;
 325         libusb_device **devlist;
 326         int ret;
 327         int devcnt = 0;
 328         int i, j;
 329
 330         /* Avoid compiler warnings. */
 331         (void)devinfo;
 332
 333         if (libusb_init(&usb_context) != 0) {
 334                 sr_warn("fx2lafw: Failed to initialize libusb.");
 335                 return 0;
 336         }
 337
 338         /* Find all fx2lafw compatible devices and upload firware to them. */
 339         libusb_get_device_list(usb_context, &devlist);
 340         for (i = 0; devlist[i]; i++) {
 341
 342                 if ((ret = libusb_get_device_descriptor(
 343                      devlist[i], &des)) != 0) {
 344                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 345                         continue;
 346                 }
 347
 348                 prof = NULL;
 349                 for (j = 0; supported_fx2[j].vid; j++) {
 350                         if (des.idVendor == supported_fx2[j].vid &&
 351                                 des.idProduct == supported_fx2[j].pid) {
 352                                 prof = &supported_fx2[j];
 353                         }
 354                 }
 355
 356                 /* Skip if the device was not found */
 357                 if (!prof)
 358                         continue;
 359
 360                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 361                         prof->vendor, prof->model, prof->model_version);
 362                 if (!sdi)
 363                         return 0;
 364
 365                 ctx = fx2lafw_dev_new();
 366                 ctx->profile = prof;
 367                 sdi->priv = ctx;
 368                 dev_insts = g_slist_append(dev_insts, sdi);
 369
 370                 if (check_conf_profile(devlist[i])) {
 371                         /* Already has the firmware, so fix the new address. */
 372                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 373                         sdi->status = SR_ST_INACTIVE;
 374                         ctx->usb = sr_usb_dev_inst_new
 375                             (libusb_get_bus_number(devlist[i]),
 376                              libusb_get_device_address(devlist[i]), NULL);
 377                 } else {
 378                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 379                                 prof->firmware) == SR_OK)
 380                                 /* Remember when the firmware on this device was updated */
 381                                 g_get_current_time(&ctx->fw_updated);
 382                         else
 383                                 sr_err("fx2lafw: Firmware upload failed for "
 384                                        "device %d.", devcnt);
 385                         ctx->usb = sr_usb_dev_inst_new
 386                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 387                 }
 388
 389                 devcnt++;
 390         }
 391         libusb_free_device_list(devlist, 1);
 392
 393         return devcnt;
 394 }
 395
 396 static int hw_dev_open(int dev_index)
 397 {
 398         GTimeVal cur_time;
 399         struct sr_dev_inst *sdi;
 400         struct context *ctx;
 401         int timediff, ret;
 402
 403         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 404                 return SR_ERR;
 405         ctx = sdi->priv;
 406
 407         /*
 408          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 409          * for the FX2 to renumerate
 410          */
 411         ret = 0;
 412         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 413                 sr_info("fx2lafw: Waiting for device to reset.");
 414                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 415                 g_usleep(300 * 1000);
 416                 timediff = 0;
 417                 while (timediff < MAX_RENUM_DELAY) {
 418                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 419                                 break;
 420                         g_usleep(100 * 1000);
 421                         g_get_current_time(&cur_time);
 422                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 423                 }
 424                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 425         } else {
 426                 ret = fx2lafw_dev_open(dev_index);
 427         }
 428
 429         if (ret != SR_OK) {
 430                 sr_err("fx2lafw: Unable to open device.");
 431                 return SR_ERR;
 432         }
 433         ctx = sdi->priv;
 434
 435         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 436         if (ret != 0) {
 437                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 438                 return SR_ERR;
 439         }
 440
 441         if (ctx->cur_samplerate == 0) {
 442                 /* Samplerate hasn't been set; default to the slowest one. */
 443                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 444                     &supported_samplerates[0]) == SR_ERR)
 445                         return SR_ERR;
 446         }
 447
 448         return SR_OK;
 449 }
 450
 451 static int hw_dev_close(int dev_index)
 452 {
 453         struct sr_dev_inst *sdi;
 454
 455         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 456                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 457                 return SR_ERR_BUG;
 458         }
 459
 460         /* TODO */
 461         close_dev(sdi);
 462
 463         return SR_OK;
 464 }
 465
 466 static int hw_cleanup(void)
 467 {
 468         GSList *l;
 469         struct sr_dev_inst *sdi;
 470         struct context *ctx;
 471         int ret = SR_OK;
 472
 473         for (l = dev_insts; l; l = l->next) {
 474                 if (!(sdi = l->data)) {
 475                         /* Log error, but continue cleaning up the rest. */
 476                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 477                                __func__);
 478                         ret = SR_ERR_BUG;
 479                         continue;
 480                 }
 481                 if (!(ctx = sdi->priv)) {
 482                         /* Log error, but continue cleaning up the rest. */
 483                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 484                                __func__);
 485                         ret = SR_ERR_BUG;
 486                         continue;
 487                 }
 488                 close_dev(sdi);
 489                 sdi = l->data;
 490                 sr_dev_inst_free(sdi);
 491         }
 492
 493         g_slist_free(dev_insts);
 494         dev_insts = NULL;
 495
 496         if (usb_context)
 497                 libusb_exit(usb_context);
 498         usb_context = NULL;
 499
 500         return ret;
 501 }
 502
 503 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 504 {
 505         struct sr_dev_inst *sdi;
 506         struct context *ctx;
 507
 508         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 509                 return NULL;
 510         ctx = sdi->priv;
 511
 512         switch (dev_info_id) {
 513         case SR_DI_INST:
 514                 return sdi;
 515         case SR_DI_NUM_PROBES:
 516                 return GINT_TO_POINTER(ctx->profile->num_probes);
 517         case SR_DI_PROBE_NAMES:
 518                 return probe_names;
 519         case SR_DI_SAMPLERATES:
 520                 return &samplerates;
 521         case SR_DI_TRIGGER_TYPES:
 522                 return TRIGGER_TYPES;
 523         case SR_DI_CUR_SAMPLERATE:
 524                 return &ctx->cur_samplerate;
 525         }
 526
 527         return NULL;
 528 }
 529
 530 static int hw_dev_status_get(int dev_index)
 531 {
 532         const struct sr_dev_inst *const sdi =
 533                 sr_dev_inst_get(dev_insts, dev_index);
 534
 535         if (!sdi)
 536                 return SR_ST_NOT_FOUND;
 537
 538         return sdi->status;
 539 }
 540
 541 static int *hw_hwcap_get_all(void)
 542 {
 543         return hwcaps;
 544 }
 545
 546 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 547 {
 548         struct sr_dev_inst *sdi;
 549         struct context *ctx;
 550         int ret;
 551
 552         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 553                 return SR_ERR;
 554         ctx = sdi->priv;
 555
 556         if (hwcap == SR_HWCAP_SAMPLERATE) {
 557                 ctx->cur_samplerate = *(uint64_t *)value;
 558                 ret = SR_OK;
 559         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 560                 ret = configure_probes(ctx, (GSList *) value);
 561         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 562                 ctx->limit_samples = *(uint64_t *)value;
 563                 ret = SR_OK;
 564         } else {
 565                 ret = SR_ERR;
 566         }
 567
 568         return ret;
 569 }
 570
 571 static int receive_data(int fd, int revents, void *cb_data)
 572 {
 573         struct timeval tv;
 574
 575         /* Avoid compiler warnings. */
 576         (void)fd;
 577         (void)revents;
 578         (void)cb_data;
 579
 580         tv.tv_sec = tv.tv_usec = 0;
 581         libusb_handle_events_timeout(usb_context, &tv);
 582
 583         return TRUE;
 584 }
 585
 586 static void abort_acquisition(struct context *ctx)
 587 {
 588         ctx->num_samples = -1;
 589 }
 590
 591 static void finish_acquisition(struct context *ctx)
 592 {
 593         struct sr_datafeed_packet packet;
 594         int i;
 595
 596         /* Terminate session */
 597         packet.type = SR_DF_END;
 598         sr_session_send(ctx->session_dev_id, &packet);
 599
 600         /* Remove fds from polling */
 601         const struct libusb_pollfd **const lupfd =
 602                 libusb_get_pollfds(usb_context);
 603         for (i = 0; lupfd[i]; i++)
 604                 sr_source_remove(lupfd[i]->fd);
 605         free(lupfd); /* NOT g_free()! */
 606 }
 607
 608 static void receive_transfer(struct libusb_transfer *transfer)
 609 {
 610         /* TODO: These statics have to move to the ctx struct. */
 611         static int empty_transfer_count = 0;
 612         struct sr_datafeed_packet packet;
 613         struct sr_datafeed_logic logic;
 614         struct context *ctx = transfer->user_data;
 615         int cur_buflen, trigger_offset, i;
 616         unsigned char *cur_buf, *new_buf;
 617
 618         /*
 619          * If acquisition has already ended, just free any queued up
 620          * transfer that come in.
 621          */
 622         if (ctx->num_samples == -1) {
 623                 if (transfer)
 624                         libusb_free_transfer(transfer);
 625
 626                 ctx->submitted_transfers--;
 627                 if (ctx->submitted_transfers == 0)
 628                         finish_acquisition(ctx);
 629
 630                 return;
 631         }
 632
 633         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 634                 transfer->status, transfer->actual_length);
 635
 636         /* Save incoming transfer before reusing the transfer struct. */
 637         cur_buf = transfer->buffer;
 638         cur_buflen = transfer->actual_length;
 639
 640         /* Fire off a new request. */
 641         if (!(new_buf = g_try_malloc(4096))) {
 642                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 643                 return; /* TODO: SR_ERR_MALLOC */
 644         }
 645
 646         transfer->buffer = new_buf;
 647         transfer->length = 4096;
 648         if (libusb_submit_transfer(transfer) != 0) {
 649                 /* TODO: Stop session? */
 650                 /* TODO: Better error message. */
 651                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 652         }
 653
 654         if (cur_buflen == 0) {
 655                 empty_transfer_count++;
 656                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 657                         /*
 658                          * The FX2 gave up. End the acquisition, the frontend
 659                          * will work out that the samplecount is short.
 660                          */
 661                         abort_acquisition(ctx);
 662                 }
 663                 return;
 664         } else {
 665                 empty_transfer_count = 0;
 666         }
 667
 668         trigger_offset = 0;
 669         if (ctx->trigger_stage >= 0) {
 670                 for (i = 0; i < cur_buflen; i++) {
 671
 672                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 673                                 /* Match on this trigger stage. */
 674                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 675                                 ctx->trigger_stage++;
 676
 677                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 678                                         /* Match on all trigger stages, we're done. */
 679                                         trigger_offset = i + 1;
 680
 681                                         /*
 682                                          * TODO: Send pre-trigger buffer to session bus.
 683                                          * Tell the frontend we hit the trigger here.
 684                                          */
 685                                         packet.type = SR_DF_TRIGGER;
 686                                         packet.payload = NULL;
 687                                         sr_session_send(ctx->session_dev_id, &packet);
 688
 689                                         /*
 690                                          * Send the samples that triggered it, since we're
 691                                          * skipping past them.
 692                                          */
 693                                         packet.type = SR_DF_LOGIC;
 694                                         packet.payload = &logic;
 695                                         logic.length = ctx->trigger_stage;
 696                                         logic.unitsize = 1;
 697                                         logic.data = ctx->trigger_buffer;
 698                                         sr_session_send(ctx->session_dev_id, &packet);
 699
 700                                         ctx->trigger_stage = TRIGGER_FIRED;
 701                                         break;
 702                                 }
 703                                 return;
 704                         }
 705
 706                         /*
 707                          * We had a match before, but not in the next sample. However, we may
 708                          * have a match on this stage in the next bit -- trigger on 0001 will
 709                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 710                          * the next sample from the one that matched originally, which the
 711                          * counter increment at the end of the loop takes care of.
 712                          */
 713                         if (ctx->trigger_stage > 0) {
 714                                 i -= ctx->trigger_stage;
 715                                 if (i < -1)
 716                                         i = -1; /* Oops, went back past this buffer. */
 717                                 /* Reset trigger stage. */
 718                                 ctx->trigger_stage = 0;
 719                         }
 720                 }
 721         }
 722
 723         if (ctx->trigger_stage == TRIGGER_FIRED) {
 724                 /* Send the incoming transfer to the session bus. */
 725                 packet.type = SR_DF_LOGIC;
 726                 packet.payload = &logic;
 727                 logic.length = cur_buflen - trigger_offset;
 728                 logic.unitsize = 1;
 729                 logic.data = cur_buf + trigger_offset;
 730                 sr_session_send(ctx->session_dev_id, &packet);
 731                 g_free(cur_buf);
 732
 733                 ctx->num_samples += cur_buflen;
 734                 if (ctx->limit_samples &&
 735                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 736                         abort_acquisition(ctx);
 737                 }
 738         } else {
 739                 /*
 740                  * TODO: Buffer pre-trigger data in capture
 741                  * ratio-sized buffer.
 742                  */
 743         }
 744 }
 745
 746 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 747 {
 748         struct sr_dev_inst *sdi;
 749         struct sr_datafeed_packet *packet;
 750         struct sr_datafeed_header *header;
 751         struct context *ctx;
 752         struct libusb_transfer *transfer;
 753         const struct libusb_pollfd **lupfd;
 754         int ret, size, i;
 755         unsigned char *buf;
 756
 757         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 758                 return SR_ERR;
 759         ctx = sdi->priv;
 760         ctx->session_dev_id = cb_data;
 761         ctx->num_samples = 0;
 762
 763         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 764                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 765                 return SR_ERR_MALLOC;
 766         }
 767
 768         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 769                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 770                 return SR_ERR_MALLOC;
 771         }
 772
 773         /* Start with 2K transfer, subsequently increased to 4K. */
 774         size = 2048;
 775         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 776                 if (!(buf = g_try_malloc(size))) {
 777                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 778                         return SR_ERR_MALLOC;
 779                 }
 780                 transfer = libusb_alloc_transfer(0);
 781                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 782                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 783                                 receive_transfer, ctx, 40);
 784                 if (libusb_submit_transfer(transfer) != 0) {
 785                         /* TODO: Free them all. */
 786                         libusb_free_transfer(transfer);
 787                         g_free(buf);
 788                         return SR_ERR;
 789                 }
 790
 791                 ctx->submitted_transfers++;
 792                 size = 4096;
 793         }
 794
 795         lupfd = libusb_get_pollfds(usb_context);
 796         for (i = 0; lupfd[i]; i++)
 797                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 798                               40, receive_data, NULL);
 799         free(lupfd); /* NOT g_free()! */
 800
 801         packet->type = SR_DF_HEADER;
 802         packet->payload = header;
 803         header->feed_version = 1;
 804         gettimeofday(&header->starttime, NULL);
 805         header->samplerate = ctx->cur_samplerate;
 806         header->num_logic_probes = ctx->profile->num_probes;
 807         sr_session_send(cb_data, packet);
 808         g_free(header);
 809         g_free(packet);
 810
 811         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 812                 ctx->cur_samplerate)) != SR_OK) {
 813                 return ret;
 814         }
 815
 816         return SR_OK;
 817 }
 818
 819 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 820 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 821 {
 822         struct sr_dev_inst *sdi;
 823
 824         /* Avoid compiler warnings. */
 825         (void)cb_data;
 826
 827         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 828                 return SR_ERR;
 829
 830         abort_acquisition(sdi->priv);
 831
 832         return SR_OK;
 833 }
 834
 835 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 836         .name = "fx2lafw",
 837         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 838         .api_version = 1,
 839         .init = hw_init,
 840         .cleanup = hw_cleanup,
 841         .dev_open = hw_dev_open,
 842         .dev_close = hw_dev_close,
 843         .dev_info_get = hw_dev_info_get,
 844         .dev_status_get = hw_dev_status_get,
 845         .hwcap_get_all = hw_hwcap_get_all,
 846         .dev_config_set = hw_dev_config_set,
 847         .dev_acquisition_start = hw_dev_acquisition_start,
 848         .dev_acquisition_stop = hw_dev_acquisition_stop,
 849 };