hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010 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 "config.h"
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/time.h>
  24 #include <inttypes.h>
  25 #include <glib.h>
  26 #include <libusb.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]) != sdi->usb->bus
 196                                 || libusb_get_device_address(devlist[i]) != sdi->usb->address)
 197                                 /* this is not the one */
 198                                 continue;
 199                 }
 200
 201                 if (!(err = libusb_open(devlist[i], &sdi->usb->devhdl))) {
 202                         if (sdi->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                                 sdi->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, sdi->usb->bus,
 212                                   sdi->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         if (sdi->usb->devhdl == NULL)
 231                 return;
 232
 233         sr_info("saleae: closing device %d on %d.%d interface %d", sdi->index,
 234                 sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 235         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 236         libusb_close(sdi->usb->devhdl);
 237         sdi->usb->devhdl = NULL;
 238         sdi->status = SR_ST_INACTIVE;
 239 }
 240
 241 static int configure_probes(struct fx2_device *fx2, GSList *probes)
 242 {
 243         struct sr_probe *probe;
 244         GSList *l;
 245         int probe_bit, stage, i;
 246         char *tc;
 247
 248         fx2->probe_mask = 0;
 249         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 250                 fx2->trigger_mask[i] = 0;
 251                 fx2->trigger_value[i] = 0;
 252         }
 253
 254         stage = -1;
 255         for (l = probes; l; l = l->next) {
 256                 probe = (struct sr_probe *)l->data;
 257                 if (probe->enabled == FALSE)
 258                         continue;
 259                 probe_bit = 1 << (probe->index - 1);
 260                 fx2->probe_mask |= probe_bit;
 261                 if (!(probe->trigger))
 262                         continue;
 263
 264                 stage = 0;
 265                 for (tc = probe->trigger; *tc; tc++) {
 266                         fx2->trigger_mask[stage] |= probe_bit;
 267                         if (*tc == '1')
 268                                 fx2->trigger_value[stage] |= probe_bit;
 269                         stage++;
 270                         if (stage > NUM_TRIGGER_STAGES)
 271                                 return SR_ERR;
 272                 }
 273         }
 274
 275         if (stage == -1)
 276                 /*
 277                  * We didn't configure any triggers, make sure acquisition
 278                  * doesn't wait for any.
 279                  */
 280                 fx2->trigger_stage = TRIGGER_FIRED;
 281         else
 282                 fx2->trigger_stage = 0;
 283
 284         return SR_OK;
 285 }
 286
 287 static struct fx2_device *fx2_device_new(void)
 288 {
 289         struct fx2_device *fx2;
 290
 291         if (!(fx2 = g_try_malloc0(sizeof(struct fx2_device)))) {
 292                 sr_err("saleae: %s: saleae malloc failed", __func__);
 293                 return NULL;
 294         }
 295         fx2->trigger_stage = TRIGGER_FIRED;
 296
 297         return fx2;
 298 }
 299
 300
 301 /*
 302  * API callbacks
 303  */
 304
 305 static int hw_init(const char *deviceinfo)
 306 {
 307         struct sr_device_instance *sdi;
 308         struct libusb_device_descriptor des;
 309         struct fx2_profile *fx2_prof;
 310         struct fx2_device *fx2;
 311         libusb_device **devlist;
 312         int err, devcnt, i, j;
 313
 314         /* Avoid compiler warnings. */
 315         (void)deviceinfo;
 316
 317         if (libusb_init(&usb_context) != 0) {
 318                 sr_warn("Failed to initialize USB.");
 319                 return 0;
 320         }
 321
 322         /* Find all Saleae Logic devices and upload firmware to all of them. */
 323         devcnt = 0;
 324         libusb_get_device_list(usb_context, &devlist);
 325         for (i = 0; devlist[i]; i++) {
 326                 fx2_prof = NULL;
 327                 err = libusb_get_device_descriptor(devlist[i], &des);
 328                 if (err != 0) {
 329                         sr_warn("failed to get device descriptor: %d", err);
 330                         continue;
 331                 }
 332
 333                 for (j = 0; supported_fx2[j].orig_vid; j++) {
 334                         if (des.idVendor == supported_fx2[j].orig_vid
 335                                 && des.idProduct == supported_fx2[j].orig_pid) {
 336                                 fx2_prof = &supported_fx2[j];
 337                                 break;
 338                         }
 339                 }
 340                 if (!fx2_prof)
 341                         /* not a supported VID/PID */
 342                         continue;
 343
 344                 sdi = sr_device_instance_new(devcnt, SR_ST_INITIALIZING,
 345                         fx2_prof->vendor, fx2_prof->model, fx2_prof->model_version);
 346                 if (!sdi)
 347                         return 0;
 348                 fx2 = fx2_device_new();
 349                 fx2->profile = fx2_prof;
 350                 sdi->priv = fx2;
 351                 device_instances = g_slist_append(device_instances, sdi);
 352
 353                 if (check_conf_profile(devlist[i])) {
 354                         /* Already has the firmware, so fix the new address. */
 355                         sdi->status = SR_ST_INACTIVE;
 356                         sdi->usb = sr_usb_device_instance_new
 357                             (libusb_get_bus_number(devlist[i]),
 358                              libusb_get_device_address(devlist[i]), NULL);
 359                 } else {
 360                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION, FIRMWARE) == SR_OK)
 361                                 /* Remember when the firmware on this device was updated */
 362                                 g_get_current_time(&fx2->fw_updated);
 363                         else
 364                                 sr_warn("firmware upload failed for device %d", devcnt);
 365                         sdi->usb = sr_usb_device_instance_new
 366                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 367                 }
 368                 devcnt++;
 369         }
 370         libusb_free_device_list(devlist, 1);
 371
 372         return devcnt;
 373 }
 374
 375 static int hw_opendev(int device_index)
 376 {
 377         GTimeVal cur_time;
 378         struct sr_device_instance *sdi;
 379         struct fx2_device *fx2;
 380         int timediff, err;
 381
 382         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 383                 return SR_ERR;
 384         fx2 = sdi->priv;
 385
 386         /*
 387          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 388          * for the FX2 to renumerate
 389          */
 390         err = 0;
 391         if (GTV_TO_MSEC(fx2->fw_updated) > 0) {
 392                 sr_info("saleae: waiting for device to reset");
 393                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 394                 g_usleep(300*1000);
 395                 timediff = 0;
 396                 while (timediff < MAX_RENUM_DELAY) {
 397                         if ((err = sl_open_device(device_index)) == SR_OK)
 398                                 break;
 399                         g_usleep(100*1000);
 400                         g_get_current_time(&cur_time);
 401                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(fx2->fw_updated);
 402                 }
 403                 sr_info("saleae: device came back after %d ms", timediff);
 404         } else {
 405                 err = sl_open_device(device_index);
 406         }
 407
 408         if (err != SR_OK) {
 409                 sr_warn("unable to open device");
 410                 return SR_ERR;
 411         }
 412         fx2 = sdi->priv;
 413
 414         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 415         if (err != 0) {
 416                 sr_warn("Unable to claim interface: %d", err);
 417                 return SR_ERR;
 418         }
 419
 420         if (fx2->cur_samplerate == 0) {
 421                 /* Samplerate hasn't been set; default to the slowest one. */
 422                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 423                     &supported_samplerates[0]) == SR_ERR)
 424                         return SR_ERR;
 425         }
 426
 427         return SR_OK;
 428 }
 429
 430 static int hw_closedev(int device_index)
 431 {
 432         struct sr_device_instance *sdi;
 433
 434         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 435                 sr_err("logic: %s: sdi was NULL", __func__);
 436                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 437         }
 438
 439         /* TODO */
 440         close_device(sdi);
 441
 442         return SR_OK;
 443 }
 444
 445 static void hw_cleanup(void)
 446 {
 447         GSList *l;
 448
 449         /* Properly close all devices... */
 450         for (l = device_instances; l; l = l->next)
 451                 close_device((struct sr_device_instance *)l->data);
 452
 453         /* ...and free all their memory. */
 454         for (l = device_instances; l; l = l->next)
 455                 g_free(l->data);
 456         g_slist_free(device_instances);
 457         device_instances = NULL;
 458
 459         if (usb_context)
 460                 libusb_exit(usb_context);
 461         usb_context = NULL;
 462 }
 463
 464 static void *hw_get_device_info(int device_index, int device_info_id)
 465 {
 466         struct sr_device_instance *sdi;
 467         struct fx2_device *fx2;
 468         void *info = NULL;
 469
 470         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 471                 return NULL;
 472         fx2 = sdi->priv;
 473
 474         switch (device_info_id) {
 475         case SR_DI_INSTANCE:
 476                 info = sdi;
 477                 break;
 478         case SR_DI_NUM_PROBES:
 479                 info = GINT_TO_POINTER(fx2->profile->num_probes);
 480                 break;
 481         case SR_DI_PROBE_NAMES:
 482                 info = probe_names;
 483                 break;
 484         case SR_DI_SAMPLERATES:
 485                 info = &samplerates;
 486                 break;
 487         case SR_DI_TRIGGER_TYPES:
 488                 info = TRIGGER_TYPES;
 489                 break;
 490         case SR_DI_CUR_SAMPLERATE:
 491                 info = &fx2->cur_samplerate;
 492                 break;
 493         }
 494
 495         return info;
 496 }
 497
 498 static int hw_get_status(int device_index)
 499 {
 500         struct sr_device_instance *sdi;
 501
 502         sdi = sr_get_device_instance(device_instances, device_index);
 503         if (sdi)
 504                 return sdi->status;
 505         else
 506                 return SR_ST_NOT_FOUND;
 507 }
 508
 509 static int *hw_get_capabilities(void)
 510 {
 511         return capabilities;
 512 }
 513
 514 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 515                                         uint64_t samplerate)
 516 {
 517         struct fx2_device *fx2;
 518         uint8_t divider;
 519         int ret, result, i;
 520         unsigned char buf[2];
 521
 522         fx2 = sdi->priv;
 523         for (i = 0; supported_samplerates[i]; i++) {
 524                 if (supported_samplerates[i] == samplerate)
 525                         break;
 526         }
 527         if (supported_samplerates[i] == 0)
 528                 return SR_ERR_SAMPLERATE;
 529
 530         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 531
 532         sr_info("saleae: setting samplerate to %" PRIu64 " Hz (divider %d)",
 533                 samplerate, divider);
 534         buf[0] = 0x01;
 535         buf[1] = divider;
 536         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 537                                    buf, 2, &result, 500);
 538         if (ret != 0) {
 539                 sr_warn("failed to set samplerate: %d", ret);
 540                 return SR_ERR;
 541         }
 542         fx2->cur_samplerate = samplerate;
 543         fx2->period_ps = 1000000000000 / samplerate;
 544
 545         return SR_OK;
 546 }
 547
 548 static int hw_set_configuration(int device_index, int capability, void *value)
 549 {
 550         struct sr_device_instance *sdi;
 551         struct fx2_device *fx2;
 552         int ret;
 553         uint64_t *tmp_u64;
 554
 555         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 556                 return SR_ERR;
 557         fx2 = sdi->priv;
 558
 559         if (capability == SR_HWCAP_SAMPLERATE) {
 560                 tmp_u64 = value;
 561                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 562         } else if (capability == SR_HWCAP_PROBECONFIG) {
 563                 ret = configure_probes(fx2, (GSList *) value);
 564         } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
 565                 tmp_u64 = value;
 566                 fx2->limit_samples = *tmp_u64;
 567                 ret = SR_OK;
 568         } else {
 569                 ret = SR_ERR;
 570         }
 571
 572         return ret;
 573 }
 574
 575 static int receive_data(int fd, int revents, void *user_data)
 576 {
 577         struct timeval tv;
 578
 579         /* Avoid compiler warnings. */
 580         (void)fd;
 581         (void)revents;
 582         (void)user_data;
 583
 584         tv.tv_sec = tv.tv_usec = 0;
 585         libusb_handle_events_timeout(usb_context, &tv);
 586
 587         return TRUE;
 588 }
 589
 590 static void receive_transfer(struct libusb_transfer *transfer)
 591 {
 592         /* TODO: these statics have to move to fx2_device struct */
 593         static int num_samples = 0;
 594         static int empty_transfer_count = 0;
 595         struct sr_datafeed_packet packet;
 596         struct sr_datafeed_logic logic;
 597         struct fx2_device *fx2;
 598         int cur_buflen, trigger_offset, i;
 599         unsigned char *cur_buf, *new_buf;
 600
 601         /* hw_stop_acquisition() is telling us to stop. */
 602         if (transfer == NULL)
 603                 num_samples = -1;
 604
 605         /*
 606          * If acquisition has already ended, just free any queued up
 607          * transfer that come in.
 608          */
 609         if (num_samples == -1) {
 610                 if (transfer)
 611                         libusb_free_transfer(transfer);
 612                 return;
 613         }
 614
 615         sr_info("saleae: receive_transfer(): status %d received %d bytes",
 616                 transfer->status, transfer->actual_length);
 617
 618         /* Save incoming transfer before reusing the transfer struct. */
 619         cur_buf = transfer->buffer;
 620         cur_buflen = transfer->actual_length;
 621         fx2 = transfer->user_data;
 622
 623         /* Fire off a new request. */
 624         if (!(new_buf = g_try_malloc(4096))) {
 625                 sr_err("saleae: %s: new_buf malloc failed", __func__);
 626                 // return SR_ERR_MALLOC;
 627                 return; /* FIXME */
 628         }
 629
 630         transfer->buffer = new_buf;
 631         transfer->length = 4096;
 632         if (libusb_submit_transfer(transfer) != 0) {
 633                 /* TODO: Stop session? */
 634                 sr_warn("eek");
 635         }
 636
 637         if (cur_buflen == 0) {
 638                 empty_transfer_count++;
 639                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 640                         /*
 641                          * The FX2 gave up. End the acquisition, the frontend
 642                          * will work out that the samplecount is short.
 643                          */
 644                         hw_stop_acquisition(-1, fx2->session_data);
 645                 }
 646                 return;
 647         } else {
 648                 empty_transfer_count = 0;
 649         }
 650
 651         trigger_offset = 0;
 652         if (fx2->trigger_stage >= 0) {
 653                 for (i = 0; i < cur_buflen; i++) {
 654
 655                         if ((cur_buf[i] & fx2->trigger_mask[fx2->trigger_stage]) == fx2->trigger_value[fx2->trigger_stage]) {
 656                                 /* Match on this trigger stage. */
 657                                 fx2->trigger_buffer[fx2->trigger_stage] = cur_buf[i];
 658                                 fx2->trigger_stage++;
 659
 660                                 if (fx2->trigger_stage == NUM_TRIGGER_STAGES || fx2->trigger_mask[fx2->trigger_stage] == 0) {
 661                                         /* Match on all trigger stages, we're done. */
 662                                         trigger_offset = i + 1;
 663
 664                                         /*
 665                                          * TODO: Send pre-trigger buffer to session bus.
 666                                          * Tell the frontend we hit the trigger here.
 667                                          */
 668                                         packet.type = SR_DF_TRIGGER;
 669                                         packet.timeoffset = (num_samples + i) * fx2->period_ps;
 670                                         packet.duration = 0;
 671                                         packet.payload = NULL;
 672                                         sr_session_bus(fx2->session_data, &packet);
 673
 674                                         /*
 675                                          * Send the samples that triggered it, since we're
 676                                          * skipping past them.
 677                                          */
 678                                         packet.type = SR_DF_LOGIC;
 679                                         packet.timeoffset = (num_samples + i) * fx2->period_ps;
 680                                         packet.duration = fx2->trigger_stage * fx2->period_ps;
 681                                         packet.payload = &logic;
 682                                         logic.length = fx2->trigger_stage;
 683                                         logic.unitsize = 1;
 684                                         logic.data = fx2->trigger_buffer;
 685                                         sr_session_bus(fx2->session_data, &packet);
 686
 687                                         fx2->trigger_stage = TRIGGER_FIRED;
 688                                         break;
 689                                 }
 690                                 return;
 691                         }
 692
 693                         /*
 694                          * We had a match before, but not in the next sample. However, we may
 695                          * have a match on this stage in the next bit -- trigger on 0001 will
 696                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 697                          * the next sample from the one that matched originally, which the
 698                          * counter increment at the end of the loop takes care of.
 699                          */
 700                         if (fx2->trigger_stage > 0) {
 701                                 i -= fx2->trigger_stage;
 702                                 if (i < -1)
 703                                         i = -1; /* Oops, went back past this buffer. */
 704                                 /* Reset trigger stage. */
 705                                 fx2->trigger_stage = 0;
 706                         }
 707                 }
 708         }
 709
 710         if (fx2->trigger_stage == TRIGGER_FIRED) {
 711                 /* Send the incoming transfer to the session bus. */
 712                 packet.type = SR_DF_LOGIC;
 713                 packet.timeoffset = num_samples * fx2->period_ps;
 714                 packet.duration = cur_buflen * fx2->period_ps;
 715                 packet.payload = &logic;
 716                 logic.length = cur_buflen - trigger_offset;
 717                 logic.unitsize = 1;
 718                 logic.data = cur_buf + trigger_offset;
 719                 sr_session_bus(fx2->session_data, &packet);
 720                 g_free(cur_buf);
 721
 722                 num_samples += cur_buflen;
 723                 if (fx2->limit_samples && (unsigned int) num_samples > fx2->limit_samples) {
 724                         hw_stop_acquisition(-1, fx2->session_data);
 725                 }
 726         } else {
 727                 /*
 728                  * TODO: Buffer pre-trigger data in capture
 729                  * ratio-sized buffer.
 730                  */
 731         }
 732 }
 733
 734 static int hw_start_acquisition(int device_index, gpointer session_data)
 735 {
 736         struct sr_device_instance *sdi;
 737         struct sr_datafeed_packet *packet;
 738         struct sr_datafeed_header *header;
 739         struct fx2_device *fx2;
 740         struct libusb_transfer *transfer;
 741         const struct libusb_pollfd **lupfd;
 742         int size, i;
 743         unsigned char *buf;
 744
 745         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 746                 return SR_ERR;
 747         fx2 = sdi->priv;
 748         fx2->session_data = session_data;
 749
 750         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 751                 sr_err("saleae: %s: packet malloc failed", __func__);
 752                 return SR_ERR_MALLOC;
 753         }
 754
 755         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 756                 sr_err("saleae: %s: header malloc failed", __func__);
 757                 return SR_ERR_MALLOC;
 758         }
 759
 760         /* Start with 2K transfer, subsequently increased to 4K. */
 761         size = 2048;
 762         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 763                 if (!(buf = g_try_malloc(size))) {
 764                         sr_err("saleae: %s: buf malloc failed", __func__);
 765                         return SR_ERR_MALLOC;
 766                 }
 767                 transfer = libusb_alloc_transfer(0);
 768                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 769                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 770                                 receive_transfer, fx2, 40);
 771                 if (libusb_submit_transfer(transfer) != 0) {
 772                         /* TODO: Free them all. */
 773                         libusb_free_transfer(transfer);
 774                         g_free(buf);
 775                         return SR_ERR;
 776                 }
 777                 size = 4096;
 778         }
 779
 780         lupfd = libusb_get_pollfds(usb_context);
 781         for (i = 0; lupfd[i]; i++)
 782                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 783                               NULL);
 784         free(lupfd);
 785
 786         packet->type = SR_DF_HEADER;
 787         packet->payload = header;
 788         header->feed_version = 1;
 789         gettimeofday(&header->starttime, NULL);
 790         header->samplerate = fx2->cur_samplerate;
 791         header->num_logic_probes = fx2->profile->num_probes;
 792         header->num_analog_probes = 0;
 793         sr_session_bus(session_data, packet);
 794         g_free(header);
 795         g_free(packet);
 796
 797         return SR_OK;
 798 }
 799
 800 /* This stops acquisition on ALL devices, ignoring device_index. */
 801 static void hw_stop_acquisition(int device_index, gpointer session_data)
 802 {
 803         struct sr_datafeed_packet packet;
 804
 805         /* Avoid compiler warnings. */
 806         (void)device_index;
 807
 808         packet.type = SR_DF_END;
 809         sr_session_bus(session_data, &packet);
 810
 811         receive_transfer(NULL);
 812
 813         /* TODO: Need to cancel and free any queued up transfers. */
 814 }
 815
 816 struct sr_device_plugin saleae_logic_plugin_info = {
 817         .name = "saleae-logic",
 818         .longname = "Saleae Logic",
 819         .api_version = 1,
 820         .init = hw_init,
 821         .cleanup = hw_cleanup,
 822         .opendev = hw_opendev,
 823         .closedev = hw_closedev,
 824         .get_device_info = hw_get_device_info,
 825         .get_status = hw_get_status,
 826         .get_capabilities = hw_get_capabilities,
 827         .set_configuration = hw_set_configuration,
 828         .start_acquisition = hw_start_acquisition,
 829         .stop_acquisition = hw_stop_acquisition,
 830 };