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 uint64_t supported_samplerates[] = {
  50         SR_KHZ(200),
  51         SR_KHZ(250),
  52         SR_KHZ(500),
  53         SR_MHZ(1),
  54         SR_MHZ(2),
  55         SR_MHZ(4),
  56         SR_MHZ(8),
  57         SR_MHZ(12),
  58         SR_MHZ(16),
  59         SR_MHZ(24),
  60         0,
  61 };
  62
  63 static struct sr_samplerates samplerates = {
  64         SR_KHZ(200),
  65         SR_MHZ(24),
  66         SR_HZ(0),
  67         supported_samplerates,
  68 };
  69
  70 /* List of struct sr_device_instance, maintained by opendev()/closedev(). */
  71 static GSList *device_instances = NULL;
  72 static libusb_context *usb_context = NULL;
  73
  74 static int hw_set_configuration(int device_index, int capability, void *value);
  75 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
  76
  77 /**
  78  * Check the USB configuration to determine if this is a Saleae Logic.
  79  *
  80  * @return 1 if the device's configuration profile match the Logic firmware's
  81  *         configuration, 0 otherwise.
  82  */
  83 static int check_conf_profile(libusb_device *dev)
  84 {
  85         struct libusb_device_descriptor des;
  86         struct libusb_config_descriptor *conf_dsc = NULL;
  87         const struct libusb_interface_descriptor *intf_dsc;
  88         int ret = -1;
  89
  90         while (ret == -1) {
  91                 /* Assume it's not a Saleae Logic unless proven wrong. */
  92                 ret = 0;
  93
  94                 if (libusb_get_device_descriptor(dev, &des) != 0)
  95                         break;
  96
  97                 if (des.bNumConfigurations != 1)
  98                         /* Need exactly 1 configuration. */
  99                         break;
 100
 101                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 102                         break;
 103
 104                 if (conf_dsc->bNumInterfaces != 1)
 105                         /* Need exactly 1 interface. */
 106                         break;
 107
 108                 if (conf_dsc->interface[0].num_altsetting != 1)
 109                         /* Need just one alternate setting. */
 110                         break;
 111
 112                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 113                 if (intf_dsc->bNumEndpoints != 2)
 114                         /* Need 2 endpoints. */
 115                         break;
 116
 117                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 118                     (1 | LIBUSB_ENDPOINT_OUT))
 119                         /* First endpoint should be 1 (outbound). */
 120                         break;
 121
 122                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 123                     (2 | LIBUSB_ENDPOINT_IN))
 124                         /* First endpoint should be 2 (inbound). */
 125                         break;
 126
 127                 /* If we made it here, it must be a Saleae Logic. */
 128                 ret = 1;
 129         }
 130
 131         if (conf_dsc)
 132                 libusb_free_config_descriptor(conf_dsc);
 133
 134         return ret;
 135 }
 136
 137 static int sl_open_device(int device_index)
 138 {
 139         libusb_device **devlist;
 140         struct libusb_device_descriptor des;
 141         struct sr_device_instance *sdi;
 142         struct fx2_device *fx2;
 143         int err, skip, i;
 144
 145         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 146                 return SR_ERR;
 147         fx2 = sdi->priv;
 148
 149         if (sdi->status == SR_ST_ACTIVE)
 150                 /* already in use */
 151                 return SR_ERR;
 152
 153         skip = 0;
 154         libusb_get_device_list(usb_context, &devlist);
 155         for (i = 0; devlist[i]; i++) {
 156                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 157                         sr_warn("failed to get device descriptor: %d", err);
 158                         continue;
 159                 }
 160
 161                 if (des.idVendor != fx2->profile->fw_vid || des.idProduct != fx2->profile->fw_pid)
 162                         continue;
 163
 164                 if (sdi->status == SR_ST_INITIALIZING) {
 165                         if (skip != device_index) {
 166                                 /* Skip devices of this type that aren't the one we want. */
 167                                 skip += 1;
 168                                 continue;
 169                         }
 170                 } else if (sdi->status == SR_ST_INACTIVE) {
 171                         /*
 172                          * This device is fully enumerated, so we need to find this
 173                          * device by vendor, product, bus and address.
 174                          */
 175                         if (libusb_get_bus_number(devlist[i]) != sdi->usb->bus
 176                                 || libusb_get_device_address(devlist[i]) != sdi->usb->address)
 177                                 /* this is not the one */
 178                                 continue;
 179                 }
 180
 181                 if (!(err = libusb_open(devlist[i], &sdi->usb->devhdl))) {
 182                         if (sdi->usb->address == 0xff)
 183                                 /*
 184                                  * first time we touch this device after firmware upload,
 185                                  * so we don't know the address yet.
 186                                  */
 187                                 sdi->usb->address = libusb_get_device_address(devlist[i]);
 188
 189                         sdi->status = SR_ST_ACTIVE;
 190                         sr_info("saleae: opened device %d on %d.%d interface %d",
 191                                   sdi->index, sdi->usb->bus,
 192                                   sdi->usb->address, USB_INTERFACE);
 193                 } else {
 194                         sr_warn("failed to open device: %d", err);
 195                 }
 196
 197                 /* if we made it here, we handled the device one way or another */
 198                 break;
 199         }
 200         libusb_free_device_list(devlist, 1);
 201
 202         if (sdi->status != SR_ST_ACTIVE)
 203                 return SR_ERR;
 204
 205         return SR_OK;
 206 }
 207
 208 static void close_device(struct sr_device_instance *sdi)
 209 {
 210         if (sdi->usb->devhdl == NULL)
 211                 return;
 212
 213         sr_info("saleae: closing device %d on %d.%d interface %d", sdi->index,
 214                 sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 215         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 216         libusb_close(sdi->usb->devhdl);
 217         sdi->usb->devhdl = NULL;
 218         sdi->status = SR_ST_INACTIVE;
 219 }
 220
 221 static int configure_probes(struct fx2_device *fx2, GSList *probes)
 222 {
 223         struct sr_probe *probe;
 224         GSList *l;
 225         int probe_bit, stage, i;
 226         char *tc;
 227
 228         fx2->probe_mask = 0;
 229         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 230                 fx2->trigger_mask[i] = 0;
 231                 fx2->trigger_value[i] = 0;
 232         }
 233
 234         stage = -1;
 235         for (l = probes; l; l = l->next) {
 236                 probe = (struct sr_probe *)l->data;
 237                 if (probe->enabled == FALSE)
 238                         continue;
 239                 probe_bit = 1 << (probe->index - 1);
 240                 fx2->probe_mask |= probe_bit;
 241                 if (!(probe->trigger))
 242                         continue;
 243
 244                 stage = 0;
 245                 for (tc = probe->trigger; *tc; tc++) {
 246                         fx2->trigger_mask[stage] |= probe_bit;
 247                         if (*tc == '1')
 248                                 fx2->trigger_value[stage] |= probe_bit;
 249                         stage++;
 250                         if (stage > NUM_TRIGGER_STAGES)
 251                                 return SR_ERR;
 252                 }
 253         }
 254
 255         if (stage == -1)
 256                 /*
 257                  * We didn't configure any triggers, make sure acquisition
 258                  * doesn't wait for any.
 259                  */
 260                 fx2->trigger_stage = TRIGGER_FIRED;
 261         else
 262                 fx2->trigger_stage = 0;
 263
 264         return SR_OK;
 265 }
 266
 267 static struct fx2_device *fx2_device_new(void)
 268 {
 269         struct fx2_device *fx2;
 270
 271         if (!(fx2 = g_try_malloc0(sizeof(struct fx2_device)))) {
 272                 sr_err("saleae: %s: saleae malloc failed", __func__);
 273                 return NULL;
 274         }
 275         fx2->trigger_stage = TRIGGER_FIRED;
 276
 277         return fx2;
 278 }
 279
 280
 281 /*
 282  * API callbacks
 283  */
 284
 285 static int hw_init(const char *deviceinfo)
 286 {
 287         struct sr_device_instance *sdi;
 288         struct libusb_device_descriptor des;
 289         struct fx2_profile *fx2_prof;
 290         struct fx2_device *fx2;
 291         libusb_device **devlist;
 292         int err, devcnt, i, j;
 293
 294         /* Avoid compiler warnings. */
 295         (void)deviceinfo;
 296
 297         if (libusb_init(&usb_context) != 0) {
 298                 sr_warn("Failed to initialize USB.");
 299                 return 0;
 300         }
 301
 302         /* Find all Saleae Logic devices and upload firmware to all of them. */
 303         devcnt = 0;
 304         libusb_get_device_list(usb_context, &devlist);
 305         for (i = 0; devlist[i]; i++) {
 306                 fx2_prof = NULL;
 307                 err = libusb_get_device_descriptor(devlist[i], &des);
 308                 if (err != 0) {
 309                         sr_warn("failed to get device descriptor: %d", err);
 310                         continue;
 311                 }
 312
 313                 for (j = 0; supported_fx2[j].orig_vid; j++) {
 314                         if (des.idVendor == supported_fx2[j].orig_vid
 315                                 && des.idProduct == supported_fx2[j].orig_pid) {
 316                                 fx2_prof = &supported_fx2[j];
 317                                 break;
 318                         }
 319                 }
 320                 if (!fx2_prof)
 321                         /* not a supported VID/PID */
 322                         continue;
 323
 324                 sdi = sr_device_instance_new(devcnt, SR_ST_INITIALIZING,
 325                         fx2_prof->vendor, fx2_prof->model, fx2_prof->model_version);
 326                 if (!sdi)
 327                         return 0;
 328                 fx2 = fx2_device_new();
 329                 fx2->profile = fx2_prof;
 330                 sdi->priv = fx2;
 331                 device_instances = g_slist_append(device_instances, sdi);
 332
 333                 if (check_conf_profile(devlist[i])) {
 334                         /* Already has the firmware, so fix the new address. */
 335                         sdi->status = SR_ST_INACTIVE;
 336                         sdi->usb = sr_usb_device_instance_new
 337                             (libusb_get_bus_number(devlist[i]),
 338                              libusb_get_device_address(devlist[i]), NULL);
 339                 } else {
 340                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION, FIRMWARE) == SR_OK)
 341                                 /* Remember when the firmware on this device was updated */
 342                                 g_get_current_time(&fx2->fw_updated);
 343                         else
 344                                 sr_warn("firmware upload failed for device %d", devcnt);
 345                         sdi->usb = sr_usb_device_instance_new
 346                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 347                 }
 348                 devcnt++;
 349         }
 350         libusb_free_device_list(devlist, 1);
 351
 352         return devcnt;
 353 }
 354
 355 static int hw_opendev(int device_index)
 356 {
 357         GTimeVal cur_time;
 358         struct sr_device_instance *sdi;
 359         struct fx2_device *fx2;
 360         int timediff, err;
 361
 362         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 363                 return SR_ERR;
 364         fx2 = sdi->priv;
 365
 366         /*
 367          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 368          * for the FX2 to renumerate
 369          */
 370         err = 0;
 371         if (GTV_TO_MSEC(fx2->fw_updated) > 0) {
 372                 sr_info("saleae: waiting for device to reset");
 373                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 374                 g_usleep(300*1000);
 375                 timediff = 0;
 376                 while (timediff < MAX_RENUM_DELAY) {
 377                         if ((err = sl_open_device(device_index)) == SR_OK)
 378                                 break;
 379                         g_usleep(100*1000);
 380                         g_get_current_time(&cur_time);
 381                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(fx2->fw_updated);
 382                 }
 383                 sr_info("saleae: device came back after %d ms", timediff);
 384         } else {
 385                 err = sl_open_device(device_index);
 386         }
 387
 388         if (err != SR_OK) {
 389                 sr_warn("unable to open device");
 390                 return SR_ERR;
 391         }
 392         fx2 = sdi->priv;
 393
 394         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 395         if (err != 0) {
 396                 sr_warn("Unable to claim interface: %d", err);
 397                 return SR_ERR;
 398         }
 399
 400         if (fx2->cur_samplerate == 0) {
 401                 /* Samplerate hasn't been set; default to the slowest one. */
 402                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 403                     &supported_samplerates[0]) == SR_ERR)
 404                         return SR_ERR;
 405         }
 406
 407         return SR_OK;
 408 }
 409
 410 static int hw_closedev(int device_index)
 411 {
 412         struct sr_device_instance *sdi;
 413
 414         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 415                 sr_err("logic: %s: sdi was NULL", __func__);
 416                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 417         }
 418
 419         /* TODO */
 420         close_device(sdi);
 421
 422         return SR_OK;
 423 }
 424
 425 static void hw_cleanup(void)
 426 {
 427         GSList *l;
 428
 429         /* Properly close all devices... */
 430         for (l = device_instances; l; l = l->next)
 431                 close_device((struct sr_device_instance *)l->data);
 432
 433         /* ...and free all their memory. */
 434         for (l = device_instances; l; l = l->next)
 435                 g_free(l->data);
 436         g_slist_free(device_instances);
 437         device_instances = NULL;
 438
 439         if (usb_context)
 440                 libusb_exit(usb_context);
 441         usb_context = NULL;
 442 }
 443
 444 static void *hw_get_device_info(int device_index, int device_info_id)
 445 {
 446         struct sr_device_instance *sdi;
 447         struct fx2_device *fx2;
 448         void *info = NULL;
 449
 450         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 451                 return NULL;
 452         fx2 = sdi->priv;
 453
 454         switch (device_info_id) {
 455         case SR_DI_INSTANCE:
 456                 info = sdi;
 457                 break;
 458         case SR_DI_NUM_PROBES:
 459                 info = GINT_TO_POINTER(fx2->profile->num_probes);
 460                 break;
 461         case SR_DI_SAMPLERATES:
 462                 info = &samplerates;
 463                 break;
 464         case SR_DI_TRIGGER_TYPES:
 465                 info = TRIGGER_TYPES;
 466                 break;
 467         case SR_DI_CUR_SAMPLERATE:
 468                 info = &fx2->cur_samplerate;
 469                 break;
 470         }
 471
 472         return info;
 473 }
 474
 475 static int hw_get_status(int device_index)
 476 {
 477         struct sr_device_instance *sdi;
 478
 479         sdi = sr_get_device_instance(device_instances, device_index);
 480         if (sdi)
 481                 return sdi->status;
 482         else
 483                 return SR_ST_NOT_FOUND;
 484 }
 485
 486 static int *hw_get_capabilities(void)
 487 {
 488         return capabilities;
 489 }
 490
 491 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 492                                         uint64_t samplerate)
 493 {
 494         struct fx2_device *fx2;
 495         uint8_t divider;
 496         int ret, result, i;
 497         unsigned char buf[2];
 498
 499         fx2 = sdi->priv;
 500         for (i = 0; supported_samplerates[i]; i++) {
 501                 if (supported_samplerates[i] == samplerate)
 502                         break;
 503         }
 504         if (supported_samplerates[i] == 0)
 505                 return SR_ERR_SAMPLERATE;
 506
 507         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 508
 509         sr_info("saleae: setting samplerate to %" PRIu64 " Hz (divider %d)",
 510                 samplerate, divider);
 511         buf[0] = 0x01;
 512         buf[1] = divider;
 513         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 514                                    buf, 2, &result, 500);
 515         if (ret != 0) {
 516                 sr_warn("failed to set samplerate: %d", ret);
 517                 return SR_ERR;
 518         }
 519         fx2->cur_samplerate = samplerate;
 520         fx2->period_ps = 1000000000000 / samplerate;
 521
 522         return SR_OK;
 523 }
 524
 525 static int hw_set_configuration(int device_index, int capability, void *value)
 526 {
 527         struct sr_device_instance *sdi;
 528         struct fx2_device *fx2;
 529         int ret;
 530         uint64_t *tmp_u64;
 531
 532         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 533                 return SR_ERR;
 534         fx2 = sdi->priv;
 535
 536         if (capability == SR_HWCAP_SAMPLERATE) {
 537                 tmp_u64 = value;
 538                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 539         } else if (capability == SR_HWCAP_PROBECONFIG) {
 540                 ret = configure_probes(fx2, (GSList *) value);
 541         } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
 542                 tmp_u64 = value;
 543                 fx2->limit_samples = *tmp_u64;
 544                 ret = SR_OK;
 545         } else {
 546                 ret = SR_ERR;
 547         }
 548
 549         return ret;
 550 }
 551
 552 static int receive_data(int fd, int revents, void *user_data)
 553 {
 554         struct timeval tv;
 555
 556         /* Avoid compiler warnings. */
 557         (void)fd;
 558         (void)revents;
 559         (void)user_data;
 560
 561         tv.tv_sec = tv.tv_usec = 0;
 562         libusb_handle_events_timeout(usb_context, &tv);
 563
 564         return TRUE;
 565 }
 566
 567 static void receive_transfer(struct libusb_transfer *transfer)
 568 {
 569         /* TODO: these statics have to move to fx2_device struct */
 570         static int num_samples = 0;
 571         static int empty_transfer_count = 0;
 572         struct sr_datafeed_packet packet;
 573         struct sr_datafeed_logic logic;
 574         struct fx2_device *fx2;
 575         int cur_buflen, trigger_offset, i;
 576         unsigned char *cur_buf, *new_buf;
 577
 578         /* hw_stop_acquisition() is telling us to stop. */
 579         if (transfer == NULL)
 580                 num_samples = -1;
 581
 582         /*
 583          * If acquisition has already ended, just free any queued up
 584          * transfer that come in.
 585          */
 586         if (num_samples == -1) {
 587                 if (transfer)
 588                         libusb_free_transfer(transfer);
 589                 return;
 590         }
 591
 592         sr_info("saleae: receive_transfer(): status %d received %d bytes",
 593                 transfer->status, transfer->actual_length);
 594
 595         /* Save incoming transfer before reusing the transfer struct. */
 596         cur_buf = transfer->buffer;
 597         cur_buflen = transfer->actual_length;
 598         fx2 = transfer->user_data;
 599
 600         /* Fire off a new request. */
 601         if (!(new_buf = g_try_malloc(4096))) {
 602                 sr_err("saleae: %s: new_buf malloc failed", __func__);
 603                 // return SR_ERR_MALLOC;
 604                 return; /* FIXME */
 605         }
 606
 607         transfer->buffer = new_buf;
 608         transfer->length = 4096;
 609         if (libusb_submit_transfer(transfer) != 0) {
 610                 /* TODO: Stop session? */
 611                 sr_warn("eek");
 612         }
 613
 614         if (cur_buflen == 0) {
 615                 empty_transfer_count++;
 616                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 617                         /*
 618                          * The FX2 gave up. End the acquisition, the frontend
 619                          * will work out that the samplecount is short.
 620                          */
 621                         hw_stop_acquisition(-1, fx2->session_data);
 622                 }
 623                 return;
 624         } else {
 625                 empty_transfer_count = 0;
 626         }
 627
 628         trigger_offset = 0;
 629         if (fx2->trigger_stage >= 0) {
 630                 for (i = 0; i < cur_buflen; i++) {
 631
 632                         if ((cur_buf[i] & fx2->trigger_mask[fx2->trigger_stage]) == fx2->trigger_value[fx2->trigger_stage]) {
 633                                 /* Match on this trigger stage. */
 634                                 fx2->trigger_buffer[fx2->trigger_stage] = cur_buf[i];
 635                                 fx2->trigger_stage++;
 636
 637                                 if (fx2->trigger_stage == NUM_TRIGGER_STAGES || fx2->trigger_mask[fx2->trigger_stage] == 0) {
 638                                         /* Match on all trigger stages, we're done. */
 639                                         trigger_offset = i + 1;
 640
 641                                         /*
 642                                          * TODO: Send pre-trigger buffer to session bus.
 643                                          * Tell the frontend we hit the trigger here.
 644                                          */
 645                                         packet.type = SR_DF_TRIGGER;
 646                                         packet.timeoffset = (num_samples + i) * fx2->period_ps;
 647                                         packet.duration = 0;
 648                                         packet.payload = NULL;
 649                                         sr_session_bus(fx2->session_data, &packet);
 650
 651                                         /*
 652                                          * Send the samples that triggered it, since we're
 653                                          * skipping past them.
 654                                          */
 655                                         packet.type = SR_DF_LOGIC;
 656                                         packet.timeoffset = (num_samples + i) * fx2->period_ps;
 657                                         packet.duration = fx2->trigger_stage * fx2->period_ps;
 658                                         packet.payload = &logic;
 659                                         logic.length = fx2->trigger_stage;
 660                                         logic.unitsize = 1;
 661                                         logic.data = fx2->trigger_buffer;
 662                                         sr_session_bus(fx2->session_data, &packet);
 663
 664                                         fx2->trigger_stage = TRIGGER_FIRED;
 665                                         break;
 666                                 }
 667                                 return;
 668                         }
 669
 670                         /*
 671                          * We had a match before, but not in the next sample. However, we may
 672                          * have a match on this stage in the next bit -- trigger on 0001 will
 673                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 674                          * the next sample from the one that matched originally, which the
 675                          * counter increment at the end of the loop takes care of.
 676                          */
 677                         if (fx2->trigger_stage > 0) {
 678                                 i -= fx2->trigger_stage;
 679                                 if (i < -1)
 680                                         i = -1; /* Oops, went back past this buffer. */
 681                                 /* Reset trigger stage. */
 682                                 fx2->trigger_stage = 0;
 683                         }
 684                 }
 685         }
 686
 687         if (fx2->trigger_stage == TRIGGER_FIRED) {
 688                 /* Send the incoming transfer to the session bus. */
 689                 packet.type = SR_DF_LOGIC;
 690                 packet.timeoffset = num_samples * fx2->period_ps;
 691                 packet.duration = cur_buflen * fx2->period_ps;
 692                 packet.payload = &logic;
 693                 logic.length = cur_buflen - trigger_offset;
 694                 logic.unitsize = 1;
 695                 logic.data = cur_buf + trigger_offset;
 696                 sr_session_bus(fx2->session_data, &packet);
 697                 g_free(cur_buf);
 698
 699                 num_samples += cur_buflen;
 700                 if (fx2->limit_samples && (unsigned int) num_samples > fx2->limit_samples) {
 701                         hw_stop_acquisition(-1, fx2->session_data);
 702                 }
 703         } else {
 704                 /*
 705                  * TODO: Buffer pre-trigger data in capture
 706                  * ratio-sized buffer.
 707                  */
 708         }
 709 }
 710
 711 static int hw_start_acquisition(int device_index, gpointer session_data)
 712 {
 713         struct sr_device_instance *sdi;
 714         struct sr_datafeed_packet *packet;
 715         struct sr_datafeed_header *header;
 716         struct fx2_device *fx2;
 717         struct libusb_transfer *transfer;
 718         const struct libusb_pollfd **lupfd;
 719         int size, i;
 720         unsigned char *buf;
 721
 722         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 723                 return SR_ERR;
 724         fx2 = sdi->priv;
 725         fx2->session_data = session_data;
 726
 727         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 728                 sr_err("saleae: %s: packet malloc failed", __func__);
 729                 return SR_ERR_MALLOC;
 730         }
 731
 732         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 733                 sr_err("saleae: %s: header malloc failed", __func__);
 734                 return SR_ERR_MALLOC;
 735         }
 736
 737         /* Start with 2K transfer, subsequently increased to 4K. */
 738         size = 2048;
 739         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 740                 if (!(buf = g_try_malloc(size))) {
 741                         sr_err("saleae: %s: buf malloc failed", __func__);
 742                         return SR_ERR_MALLOC;
 743                 }
 744                 transfer = libusb_alloc_transfer(0);
 745                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 746                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 747                                 receive_transfer, fx2, 40);
 748                 if (libusb_submit_transfer(transfer) != 0) {
 749                         /* TODO: Free them all. */
 750                         libusb_free_transfer(transfer);
 751                         g_free(buf);
 752                         return SR_ERR;
 753                 }
 754                 size = 4096;
 755         }
 756
 757         lupfd = libusb_get_pollfds(usb_context);
 758         for (i = 0; lupfd[i]; i++)
 759                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 760                               NULL);
 761         free(lupfd);
 762
 763         packet->type = SR_DF_HEADER;
 764         packet->payload = header;
 765         header->feed_version = 1;
 766         gettimeofday(&header->starttime, NULL);
 767         header->samplerate = fx2->cur_samplerate;
 768         header->num_logic_probes = fx2->profile->num_probes;
 769         header->num_analog_probes = 0;
 770         sr_session_bus(session_data, packet);
 771         g_free(header);
 772         g_free(packet);
 773
 774         return SR_OK;
 775 }
 776
 777 /* This stops acquisition on ALL devices, ignoring device_index. */
 778 static void hw_stop_acquisition(int device_index, gpointer session_data)
 779 {
 780         struct sr_datafeed_packet packet;
 781
 782         /* Avoid compiler warnings. */
 783         (void)device_index;
 784
 785         packet.type = SR_DF_END;
 786         sr_session_bus(session_data, &packet);
 787
 788         receive_transfer(NULL);
 789
 790         /* TODO: Need to cancel and free any queued up transfers. */
 791 }
 792
 793 struct sr_device_plugin saleae_logic_plugin_info = {
 794         .name = "saleae-logic",
 795         .longname = "Saleae Logic",
 796         .api_version = 1,
 797         .init = hw_init,
 798         .cleanup = hw_cleanup,
 799         .opendev = hw_opendev,
 800         .closedev = hw_closedev,
 801         .get_device_info = hw_get_device_info,
 802         .get_status = hw_get_status,
 803         .get_capabilities = hw_get_capabilities,
 804         .set_configuration = hw_set_configuration,
 805         .start_acquisition = hw_start_acquisition,
 806         .stop_acquisition = hw_stop_acquisition,
 807 };