hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
   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 <sys/time.h>
  23 #include <inttypes.h>
  24 #include <glib.h>
  25 #include <libusb.h>
  26 #include "config.h"
  27 #include "sigrok.h"
  28 #include "sigrok-internal.h"
  29 #include "saleae-logic.h"
  30
  31 static struct fx2_profile supported_fx2[] = {
  32         /* Saleae Logic */
  33         { 0x0925, 0x3881, 0x0925, 0x3881, "Saleae", "Logic", NULL, 8 },
  34         /* default Cypress FX2 without EEPROM */
  35         { 0x04b4, 0x8613, 0x0925, 0x3881, "Cypress", "FX2", NULL, 16 },
  36         { 0, 0, 0, 0, 0, 0, 0, 0 }
  37 };
  38
  39 static int capabilities[] = {
  40         SR_HWCAP_LOGIC_ANALYZER,
  41         SR_HWCAP_SAMPLERATE,
  42
  43         /* These are really implemented in the driver, not the hardware. */
  44         SR_HWCAP_LIMIT_SAMPLES,
  45         SR_HWCAP_CONTINUOUS,
  46         0,
  47 };
  48
  49 static const char *probe_names[] = {
  50         "0",
  51         "1",
  52         "2",
  53         "3",
  54         "4",
  55         "5",
  56         "6",
  57         "7",
  58         "8",
  59         "9",
  60         "10",
  61         "11",
  62         "12",
  63         "13",
  64         "14",
  65         "15",
  66         NULL,
  67 };
  68
  69 static uint64_t supported_samplerates[] = {
  70         SR_KHZ(200),
  71         SR_KHZ(250),
  72         SR_KHZ(500),
  73         SR_MHZ(1),
  74         SR_MHZ(2),
  75         SR_MHZ(4),
  76         SR_MHZ(8),
  77         SR_MHZ(12),
  78         SR_MHZ(16),
  79         SR_MHZ(24),
  80         0,
  81 };
  82
  83 static struct sr_samplerates samplerates = {
  84         SR_KHZ(200),
  85         SR_MHZ(24),
  86         SR_HZ(0),
  87         supported_samplerates,
  88 };
  89
  90 /* List of struct sr_device_instance, maintained by opendev()/closedev(). */
  91 static GSList *device_instances = NULL;
  92 static libusb_context *usb_context = NULL;
  93
  94 static int hw_set_configuration(int device_index, int capability, void *value);
  95 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
  96
  97 /**
  98  * Check the USB configuration to determine if this is a Saleae Logic.
  99  *
 100  * @return 1 if the device's configuration profile match the Logic firmware's
 101  *         configuration, 0 otherwise.
 102  */
 103 static int check_conf_profile(libusb_device *dev)
 104 {
 105         struct libusb_device_descriptor des;
 106         struct libusb_config_descriptor *conf_dsc = NULL;
 107         const struct libusb_interface_descriptor *intf_dsc;
 108         int ret = -1;
 109
 110         while (ret == -1) {
 111                 /* Assume it's not a Saleae Logic unless proven wrong. */
 112                 ret = 0;
 113
 114                 if (libusb_get_device_descriptor(dev, &des) != 0)
 115                         break;
 116
 117                 if (des.bNumConfigurations != 1)
 118                         /* Need exactly 1 configuration. */
 119                         break;
 120
 121                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 122                         break;
 123
 124                 if (conf_dsc->bNumInterfaces != 1)
 125                         /* Need exactly 1 interface. */
 126                         break;
 127
 128                 if (conf_dsc->interface[0].num_altsetting != 1)
 129                         /* Need just one alternate setting. */
 130                         break;
 131
 132                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 133                 if (intf_dsc->bNumEndpoints != 2)
 134                         /* Need 2 endpoints. */
 135                         break;
 136
 137                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 138                     (1 | LIBUSB_ENDPOINT_OUT))
 139                         /* First endpoint should be 1 (outbound). */
 140                         break;
 141
 142                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 143                     (2 | LIBUSB_ENDPOINT_IN))
 144                         /* First endpoint should be 2 (inbound). */
 145                         break;
 146
 147                 /* If we made it here, it must be a Saleae Logic. */
 148                 ret = 1;
 149         }
 150
 151         if (conf_dsc)
 152                 libusb_free_config_descriptor(conf_dsc);
 153
 154         return ret;
 155 }
 156
 157 static int sl_open_device(int device_index)
 158 {
 159         libusb_device **devlist;
 160         struct libusb_device_descriptor des;
 161         struct sr_device_instance *sdi;
 162         struct fx2_device *fx2;
 163         int err, skip, i;
 164
 165         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 166                 return SR_ERR;
 167         fx2 = sdi->priv;
 168
 169         if (sdi->status == SR_ST_ACTIVE)
 170                 /* already in use */
 171                 return SR_ERR;
 172
 173         skip = 0;
 174         libusb_get_device_list(usb_context, &devlist);
 175         for (i = 0; devlist[i]; i++) {
 176                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 177                         sr_warn("failed to get device descriptor: %d", err);
 178                         continue;
 179                 }
 180
 181                 if (des.idVendor != fx2->profile->fw_vid || des.idProduct != fx2->profile->fw_pid)
 182                         continue;
 183
 184                 if (sdi->status == SR_ST_INITIALIZING) {
 185                         if (skip != device_index) {
 186                                 /* Skip devices of this type that aren't the one we want. */
 187                                 skip += 1;
 188                                 continue;
 189                         }
 190                 } else if (sdi->status == SR_ST_INACTIVE) {
 191                         /*
 192                          * This device is fully enumerated, so we need to find this
 193                          * device by vendor, product, bus and address.
 194                          */
 195                         if (libusb_get_bus_number(devlist[i]) != fx2->usb->bus
 196                                 || libusb_get_device_address(devlist[i]) != fx2->usb->address)
 197                                 /* this is not the one */
 198                                 continue;
 199                 }
 200
 201                 if (!(err = libusb_open(devlist[i], &fx2->usb->devhdl))) {
 202                         if (fx2->usb->address == 0xff)
 203                                 /*
 204                                  * first time we touch this device after firmware upload,
 205                                  * so we don't know the address yet.
 206                                  */
 207                                 fx2->usb->address = libusb_get_device_address(devlist[i]);
 208
 209                         sdi->status = SR_ST_ACTIVE;
 210                         sr_info("saleae: opened device %d on %d.%d interface %d",
 211                                   sdi->index, fx2->usb->bus,
 212                                   fx2->usb->address, USB_INTERFACE);
 213                 } else {
 214                         sr_warn("failed to open device: %d", err);
 215                 }
 216
 217                 /* if we made it here, we handled the device one way or another */
 218                 break;
 219         }
 220         libusb_free_device_list(devlist, 1);
 221
 222         if (sdi->status != SR_ST_ACTIVE)
 223                 return SR_ERR;
 224
 225         return SR_OK;
 226 }
 227
 228 static void close_device(struct sr_device_instance *sdi)
 229 {
 230         struct fx2_device *fx2;
 231
 232         fx2 = sdi->priv;
 233
 234         if (fx2->usb->devhdl == NULL)
 235                 return;
 236
 237         sr_info("saleae: closing device %d on %d.%d interface %d", sdi->index,
 238                 fx2->usb->bus, fx2->usb->address, USB_INTERFACE);
 239         libusb_release_interface(fx2->usb->devhdl, USB_INTERFACE);
 240         libusb_close(fx2->usb->devhdl);
 241         fx2->usb->devhdl = NULL;
 242         sdi->status = SR_ST_INACTIVE;
 243 }
 244
 245 static int configure_probes(struct fx2_device *fx2, GSList *probes)
 246 {
 247         struct sr_probe *probe;
 248         GSList *l;
 249         int probe_bit, stage, i;
 250         char *tc;
 251
 252         fx2->probe_mask = 0;
 253         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 254                 fx2->trigger_mask[i] = 0;
 255                 fx2->trigger_value[i] = 0;
 256         }
 257
 258         stage = -1;
 259         for (l = probes; l; l = l->next) {
 260                 probe = (struct sr_probe *)l->data;
 261                 if (probe->enabled == FALSE)
 262                         continue;
 263                 probe_bit = 1 << (probe->index - 1);
 264                 fx2->probe_mask |= probe_bit;
 265                 if (!(probe->trigger))
 266                         continue;
 267
 268                 stage = 0;
 269                 for (tc = probe->trigger; *tc; tc++) {
 270                         fx2->trigger_mask[stage] |= probe_bit;
 271                         if (*tc == '1')
 272                                 fx2->trigger_value[stage] |= probe_bit;
 273                         stage++;
 274                         if (stage > NUM_TRIGGER_STAGES)
 275                                 return SR_ERR;
 276                 }
 277         }
 278
 279         if (stage == -1)
 280                 /*
 281                  * We didn't configure any triggers, make sure acquisition
 282                  * doesn't wait for any.
 283                  */
 284                 fx2->trigger_stage = TRIGGER_FIRED;
 285         else
 286                 fx2->trigger_stage = 0;
 287
 288         return SR_OK;
 289 }
 290
 291 static struct fx2_device *fx2_device_new(void)
 292 {
 293         struct fx2_device *fx2;
 294
 295         if (!(fx2 = g_try_malloc0(sizeof(struct fx2_device)))) {
 296                 sr_err("saleae: %s: fx2 malloc failed", __func__);
 297                 return NULL;
 298         }
 299         fx2->trigger_stage = TRIGGER_FIRED;
 300         fx2->usb = NULL;
 301
 302         return fx2;
 303 }
 304
 305
 306 /*
 307  * API callbacks
 308  */
 309
 310 static int hw_init(const char *deviceinfo)
 311 {
 312         struct sr_device_instance *sdi;
 313         struct libusb_device_descriptor des;
 314         struct fx2_profile *fx2_prof;
 315         struct fx2_device *fx2;
 316         libusb_device **devlist;
 317         int err, devcnt, i, j;
 318
 319         /* Avoid compiler warnings. */
 320         (void)deviceinfo;
 321
 322         if (libusb_init(&usb_context) != 0) {
 323                 sr_warn("Failed to initialize USB.");
 324                 return 0;
 325         }
 326
 327         /* Find all Saleae Logic devices and upload firmware to all of them. */
 328         devcnt = 0;
 329         libusb_get_device_list(usb_context, &devlist);
 330         for (i = 0; devlist[i]; i++) {
 331                 fx2_prof = NULL;
 332                 err = libusb_get_device_descriptor(devlist[i], &des);
 333                 if (err != 0) {
 334                         sr_warn("failed to get device descriptor: %d", err);
 335                         continue;
 336                 }
 337
 338                 for (j = 0; supported_fx2[j].orig_vid; j++) {
 339                         if (des.idVendor == supported_fx2[j].orig_vid
 340                                 && des.idProduct == supported_fx2[j].orig_pid) {
 341                                 fx2_prof = &supported_fx2[j];
 342                                 break;
 343                         }
 344                 }
 345                 if (!fx2_prof)
 346                         /* not a supported VID/PID */
 347                         continue;
 348
 349                 sdi = sr_device_instance_new(devcnt, SR_ST_INITIALIZING,
 350                         fx2_prof->vendor, fx2_prof->model, fx2_prof->model_version);
 351                 if (!sdi)
 352                         return 0;
 353                 fx2 = fx2_device_new();
 354                 fx2->profile = fx2_prof;
 355                 sdi->priv = fx2;
 356                 device_instances = g_slist_append(device_instances, sdi);
 357
 358                 if (check_conf_profile(devlist[i])) {
 359                         /* Already has the firmware, so fix the new address. */
 360                         sdi->status = SR_ST_INACTIVE;
 361                         fx2->usb = sr_usb_device_instance_new
 362                             (libusb_get_bus_number(devlist[i]),
 363                              libusb_get_device_address(devlist[i]), NULL);
 364                 } else {
 365                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION, FIRMWARE) == SR_OK)
 366                                 /* Remember when the firmware on this device was updated */
 367                                 g_get_current_time(&fx2->fw_updated);
 368                         else
 369                                 sr_warn("firmware upload failed for device %d", devcnt);
 370                         fx2->usb = sr_usb_device_instance_new
 371                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 372                 }
 373                 devcnt++;
 374         }
 375         libusb_free_device_list(devlist, 1);
 376
 377         return devcnt;
 378 }
 379
 380 static int hw_opendev(int device_index)
 381 {
 382         GTimeVal cur_time;
 383         struct sr_device_instance *sdi;
 384         struct fx2_device *fx2;
 385         int timediff, err;
 386
 387         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 388                 return SR_ERR;
 389         fx2 = sdi->priv;
 390
 391         /*
 392          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 393          * for the FX2 to renumerate
 394          */
 395         err = 0;
 396         if (GTV_TO_MSEC(fx2->fw_updated) > 0) {
 397                 sr_info("saleae: waiting for device to reset");
 398                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 399                 g_usleep(300*1000);
 400                 timediff = 0;
 401                 while (timediff < MAX_RENUM_DELAY) {
 402                         if ((err = sl_open_device(device_index)) == SR_OK)
 403                                 break;
 404                         g_usleep(100*1000);
 405                         g_get_current_time(&cur_time);
 406                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(fx2->fw_updated);
 407                 }
 408                 sr_info("saleae: device came back after %d ms", timediff);
 409         } else {
 410                 err = sl_open_device(device_index);
 411         }
 412
 413         if (err != SR_OK) {
 414                 sr_warn("unable to open device");
 415                 return SR_ERR;
 416         }
 417         fx2 = sdi->priv;
 418
 419         err = libusb_claim_interface(fx2->usb->devhdl, USB_INTERFACE);
 420         if (err != 0) {
 421                 sr_warn("Unable to claim interface: %d", err);
 422                 return SR_ERR;
 423         }
 424
 425         if (fx2->cur_samplerate == 0) {
 426                 /* Samplerate hasn't been set; default to the slowest one. */
 427                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 428                     &supported_samplerates[0]) == SR_ERR)
 429                         return SR_ERR;
 430         }
 431
 432         return SR_OK;
 433 }
 434
 435 static int hw_closedev(int device_index)
 436 {
 437         struct sr_device_instance *sdi;
 438
 439         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 440                 sr_err("logic: %s: sdi was NULL", __func__);
 441                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 442         }
 443
 444         /* TODO */
 445         close_device(sdi);
 446
 447         return SR_OK;
 448 }
 449
 450 static void hw_cleanup(void)
 451 {
 452         GSList *l;
 453         struct sr_device_instance *sdi;
 454         struct fx2_device *fx2;
 455
 456         /* Properly close and free all devices. */
 457         for (l = device_instances; l; l = l->next) {
 458                 sdi = l->data;
 459                 fx2 = sdi->priv;
 460                 close_device(sdi);
 461                 sr_usb_device_instance_free(fx2->usb);
 462                 sr_device_instance_free(sdi);
 463         }
 464
 465         g_slist_free(device_instances);
 466         device_instances = NULL;
 467
 468         if (usb_context)
 469                 libusb_exit(usb_context);
 470         usb_context = NULL;
 471 }
 472
 473 static void *hw_get_device_info(int device_index, int device_info_id)
 474 {
 475         struct sr_device_instance *sdi;
 476         struct fx2_device *fx2;
 477         void *info = NULL;
 478
 479         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 480                 return NULL;
 481         fx2 = sdi->priv;
 482
 483         switch (device_info_id) {
 484         case SR_DI_INSTANCE:
 485                 info = sdi;
 486                 break;
 487         case SR_DI_NUM_PROBES:
 488                 info = GINT_TO_POINTER(fx2->profile->num_probes);
 489                 break;
 490         case SR_DI_PROBE_NAMES:
 491                 info = probe_names;
 492                 break;
 493         case SR_DI_SAMPLERATES:
 494                 info = &samplerates;
 495                 break;
 496         case SR_DI_TRIGGER_TYPES:
 497                 info = TRIGGER_TYPES;
 498                 break;
 499         case SR_DI_CUR_SAMPLERATE:
 500                 info = &fx2->cur_samplerate;
 501                 break;
 502         }
 503
 504         return info;
 505 }
 506
 507 static int hw_get_status(int device_index)
 508 {
 509         struct sr_device_instance *sdi;
 510
 511         sdi = sr_get_device_instance(device_instances, device_index);
 512         if (sdi)
 513                 return sdi->status;
 514         else
 515                 return SR_ST_NOT_FOUND;
 516 }
 517
 518 static int *hw_get_capabilities(void)
 519 {
 520         return capabilities;
 521 }
 522
 523 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 524                                         uint64_t samplerate)
 525 {
 526         struct fx2_device *fx2;
 527         uint8_t divider;
 528         int ret, result, i;
 529         unsigned char buf[2];
 530
 531         fx2 = sdi->priv;
 532         for (i = 0; supported_samplerates[i]; i++) {
 533                 if (supported_samplerates[i] == samplerate)
 534                         break;
 535         }
 536         if (supported_samplerates[i] == 0)
 537                 return SR_ERR_SAMPLERATE;
 538
 539         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 540
 541         sr_info("saleae: setting samplerate to %" PRIu64 " Hz (divider %d)",
 542                 samplerate, divider);
 543         buf[0] = 0x01;
 544         buf[1] = divider;
 545         ret = libusb_bulk_transfer(fx2->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 546                                    buf, 2, &result, 500);
 547         if (ret != 0) {
 548                 sr_warn("failed to set samplerate: %d", ret);
 549                 return SR_ERR;
 550         }
 551         fx2->cur_samplerate = samplerate;
 552
 553         return SR_OK;
 554 }
 555
 556 static int hw_set_configuration(int device_index, int capability, void *value)
 557 {
 558         struct sr_device_instance *sdi;
 559         struct fx2_device *fx2;
 560         int ret;
 561         uint64_t *tmp_u64;
 562
 563         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 564                 return SR_ERR;
 565         fx2 = sdi->priv;
 566
 567         if (capability == SR_HWCAP_SAMPLERATE) {
 568                 tmp_u64 = value;
 569                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 570         } else if (capability == SR_HWCAP_PROBECONFIG) {
 571                 ret = configure_probes(fx2, (GSList *) value);
 572         } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
 573                 tmp_u64 = value;
 574                 fx2->limit_samples = *tmp_u64;
 575                 ret = SR_OK;
 576         } else {
 577                 ret = SR_ERR;
 578         }
 579
 580         return ret;
 581 }
 582
 583 static int receive_data(int fd, int revents, void *user_data)
 584 {
 585         struct timeval tv;
 586
 587         /* Avoid compiler warnings. */
 588         (void)fd;
 589         (void)revents;
 590         (void)user_data;
 591
 592         tv.tv_sec = tv.tv_usec = 0;
 593         libusb_handle_events_timeout(usb_context, &tv);
 594
 595         return TRUE;
 596 }
 597
 598 static void receive_transfer(struct libusb_transfer *transfer)
 599 {
 600         /* TODO: these statics have to move to fx2_device struct */
 601         static int num_samples = 0;
 602         static int empty_transfer_count = 0;
 603         struct sr_datafeed_packet packet;
 604         struct sr_datafeed_logic logic;
 605         struct fx2_device *fx2;
 606         int cur_buflen, trigger_offset, i;
 607         unsigned char *cur_buf, *new_buf;
 608
 609         /* hw_stop_acquisition() is telling us to stop. */
 610         if (transfer == NULL)
 611                 num_samples = -1;
 612
 613         /*
 614          * If acquisition has already ended, just free any queued up
 615          * transfer that come in.
 616          */
 617         if (num_samples == -1) {
 618                 if (transfer)
 619                         libusb_free_transfer(transfer);
 620                 return;
 621         }
 622
 623         sr_info("saleae: receive_transfer(): status %d received %d bytes",
 624                 transfer->status, transfer->actual_length);
 625
 626         /* Save incoming transfer before reusing the transfer struct. */
 627         cur_buf = transfer->buffer;
 628         cur_buflen = transfer->actual_length;
 629         fx2 = transfer->user_data;
 630
 631         /* Fire off a new request. */
 632         if (!(new_buf = g_try_malloc(4096))) {
 633                 sr_err("saleae: %s: new_buf malloc failed", __func__);
 634                 // return SR_ERR_MALLOC;
 635                 return; /* FIXME */
 636         }
 637
 638         transfer->buffer = new_buf;
 639         transfer->length = 4096;
 640         if (libusb_submit_transfer(transfer) != 0) {
 641                 /* TODO: Stop session? */
 642                 sr_warn("eek");
 643         }
 644
 645         if (cur_buflen == 0) {
 646                 empty_transfer_count++;
 647                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 648                         /*
 649                          * The FX2 gave up. End the acquisition, the frontend
 650                          * will work out that the samplecount is short.
 651                          */
 652                         hw_stop_acquisition(-1, fx2->session_data);
 653                 }
 654                 return;
 655         } else {
 656                 empty_transfer_count = 0;
 657         }
 658
 659         trigger_offset = 0;
 660         if (fx2->trigger_stage >= 0) {
 661                 for (i = 0; i < cur_buflen; i++) {
 662
 663                         if ((cur_buf[i] & fx2->trigger_mask[fx2->trigger_stage]) == fx2->trigger_value[fx2->trigger_stage]) {
 664                                 /* Match on this trigger stage. */
 665                                 fx2->trigger_buffer[fx2->trigger_stage] = cur_buf[i];
 666                                 fx2->trigger_stage++;
 667
 668                                 if (fx2->trigger_stage == NUM_TRIGGER_STAGES || fx2->trigger_mask[fx2->trigger_stage] == 0) {
 669                                         /* Match on all trigger stages, we're done. */
 670                                         trigger_offset = i + 1;
 671
 672                                         /*
 673                                          * TODO: Send pre-trigger buffer to session bus.
 674                                          * Tell the frontend we hit the trigger here.
 675                                          */
 676                                         packet.type = SR_DF_TRIGGER;
 677                                         packet.payload = NULL;
 678                                         sr_session_bus(fx2->session_data, &packet);
 679
 680                                         /*
 681                                          * Send the samples that triggered it, since we're
 682                                          * skipping past them.
 683                                          */
 684                                         packet.type = SR_DF_LOGIC;
 685                                         packet.payload = &logic;
 686                                         logic.length = fx2->trigger_stage;
 687                                         logic.unitsize = 1;
 688                                         logic.data = fx2->trigger_buffer;
 689                                         sr_session_bus(fx2->session_data, &packet);
 690
 691                                         fx2->trigger_stage = TRIGGER_FIRED;
 692                                         break;
 693                                 }
 694                                 return;
 695                         }
 696
 697                         /*
 698                          * We had a match before, but not in the next sample. However, we may
 699                          * have a match on this stage in the next bit -- trigger on 0001 will
 700                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 701                          * the next sample from the one that matched originally, which the
 702                          * counter increment at the end of the loop takes care of.
 703                          */
 704                         if (fx2->trigger_stage > 0) {
 705                                 i -= fx2->trigger_stage;
 706                                 if (i < -1)
 707                                         i = -1; /* Oops, went back past this buffer. */
 708                                 /* Reset trigger stage. */
 709                                 fx2->trigger_stage = 0;
 710                         }
 711                 }
 712         }
 713
 714         if (fx2->trigger_stage == TRIGGER_FIRED) {
 715                 /* Send the incoming transfer to the session bus. */
 716                 packet.type = SR_DF_LOGIC;
 717                 packet.payload = &logic;
 718                 logic.length = cur_buflen - trigger_offset;
 719                 logic.unitsize = 1;
 720                 logic.data = cur_buf + trigger_offset;
 721                 sr_session_bus(fx2->session_data, &packet);
 722                 g_free(cur_buf);
 723
 724                 num_samples += cur_buflen;
 725                 if (fx2->limit_samples && (unsigned int) num_samples > fx2->limit_samples) {
 726                         hw_stop_acquisition(-1, fx2->session_data);
 727                 }
 728         } else {
 729                 /*
 730                  * TODO: Buffer pre-trigger data in capture
 731                  * ratio-sized buffer.
 732                  */
 733         }
 734 }
 735
 736 static int hw_start_acquisition(int device_index, gpointer session_data)
 737 {
 738         struct sr_device_instance *sdi;
 739         struct sr_datafeed_packet *packet;
 740         struct sr_datafeed_header *header;
 741         struct fx2_device *fx2;
 742         struct libusb_transfer *transfer;
 743         const struct libusb_pollfd **lupfd;
 744         int size, i;
 745         unsigned char *buf;
 746
 747         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 748                 return SR_ERR;
 749         fx2 = sdi->priv;
 750         fx2->session_data = session_data;
 751
 752         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 753                 sr_err("saleae: %s: packet malloc failed", __func__);
 754                 return SR_ERR_MALLOC;
 755         }
 756
 757         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 758                 sr_err("saleae: %s: header malloc failed", __func__);
 759                 return SR_ERR_MALLOC;
 760         }
 761
 762         /* Start with 2K transfer, subsequently increased to 4K. */
 763         size = 2048;
 764         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 765                 if (!(buf = g_try_malloc(size))) {
 766                         sr_err("saleae: %s: buf malloc failed", __func__);
 767                         return SR_ERR_MALLOC;
 768                 }
 769                 transfer = libusb_alloc_transfer(0);
 770                 libusb_fill_bulk_transfer(transfer, fx2->usb->devhdl,
 771                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 772                                 receive_transfer, fx2, 40);
 773                 if (libusb_submit_transfer(transfer) != 0) {
 774                         /* TODO: Free them all. */
 775                         libusb_free_transfer(transfer);
 776                         g_free(buf);
 777                         return SR_ERR;
 778                 }
 779                 size = 4096;
 780         }
 781
 782         lupfd = libusb_get_pollfds(usb_context);
 783         for (i = 0; lupfd[i]; i++)
 784                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 785                               NULL);
 786         free(lupfd);
 787
 788         packet->type = SR_DF_HEADER;
 789         packet->payload = header;
 790         header->feed_version = 1;
 791         gettimeofday(&header->starttime, NULL);
 792         header->samplerate = fx2->cur_samplerate;
 793         header->num_logic_probes = fx2->profile->num_probes;
 794         header->num_analog_probes = 0;
 795         sr_session_bus(session_data, packet);
 796         g_free(header);
 797         g_free(packet);
 798
 799         return SR_OK;
 800 }
 801
 802 /* This stops acquisition on ALL devices, ignoring device_index. */
 803 static void hw_stop_acquisition(int device_index, gpointer session_data)
 804 {
 805         struct sr_datafeed_packet packet;
 806
 807         /* Avoid compiler warnings. */
 808         (void)device_index;
 809
 810         packet.type = SR_DF_END;
 811         sr_session_bus(session_data, &packet);
 812
 813         receive_transfer(NULL);
 814
 815         /* TODO: Need to cancel and free any queued up transfers. */
 816 }
 817
 818 SR_PRIV struct sr_device_plugin saleae_logic_plugin_info = {
 819         .name = "saleae-logic",
 820         .longname = "Saleae Logic",
 821         .api_version = 1,
 822         .init = hw_init,
 823         .cleanup = hw_cleanup,
 824         .opendev = hw_opendev,
 825         .closedev = hw_closedev,
 826         .get_device_info = hw_get_device_info,
 827         .get_status = hw_get_status,
 828         .get_capabilities = hw_get_capabilities,
 829         .set_configuration = hw_set_configuration,
 830         .start_acquisition = hw_start_acquisition,
 831         .stop_acquisition = hw_stop_acquisition,
 832 };