hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 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 new_saleae_logic_firmware = 0;
  95
  96 static int hw_set_configuration(int device_index, int capability, void *value);
  97 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
  98
  99 /**
 100  * Check the USB configuration to determine if this is a Saleae Logic.
 101  *
 102  * @return 1 if the device's configuration profile match the Logic firmware's
 103  *         configuration, 0 otherwise.
 104  */
 105 static int check_conf_profile(libusb_device *dev)
 106 {
 107         struct libusb_device_descriptor des;
 108         struct libusb_config_descriptor *conf_dsc = NULL;
 109         const struct libusb_interface_descriptor *intf_dsc;
 110         int ret = -1;
 111
 112         while (ret == -1) {
 113                 /* Assume it's not a Saleae Logic unless proven wrong. */
 114                 ret = 0;
 115
 116                 if (libusb_get_device_descriptor(dev, &des) != 0)
 117                         break;
 118
 119                 if (des.bNumConfigurations != 1)
 120                         /* Need exactly 1 configuration. */
 121                         break;
 122
 123                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 124                         break;
 125
 126                 if (conf_dsc->bNumInterfaces != 1)
 127                         /* Need exactly 1 interface. */
 128                         break;
 129
 130                 if (conf_dsc->interface[0].num_altsetting != 1)
 131                         /* Need just one alternate setting. */
 132                         break;
 133
 134                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 135                 if (intf_dsc->bNumEndpoints == 4) {
 136                         /* The new Saleae Logic firmware has 4 endpoints. */
 137                         new_saleae_logic_firmware = 1;
 138                 } else if (intf_dsc->bNumEndpoints == 2) {
 139                         /* The old Saleae Logic firmware has 2 endpoints. */
 140                         new_saleae_logic_firmware = 0;
 141                 } else {
 142                         /* Other number of endpoints -> not a Saleae Logic. */
 143                         break;
 144                 }
 145
 146                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 147                     (1 | LIBUSB_ENDPOINT_OUT))
 148                         /* The first endpoint should be 1 (outbound). */
 149                         break;
 150
 151                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 152                     (2 | LIBUSB_ENDPOINT_IN))
 153                         /* The second endpoint should be 2 (inbound). */
 154                         break;
 155
 156                 /* TODO: The new firmware has 4 endpoints... */
 157
 158                 /* If we made it here, it must be a Saleae Logic. */
 159                 ret = 1;
 160         }
 161
 162         if (conf_dsc)
 163                 libusb_free_config_descriptor(conf_dsc);
 164
 165         return ret;
 166 }
 167
 168 static int sl_open_device(int device_index)
 169 {
 170         libusb_device **devlist;
 171         struct libusb_device_descriptor des;
 172         struct sr_device_instance *sdi;
 173         struct fx2_device *fx2;
 174         int err, skip, i;
 175
 176         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 177                 return SR_ERR;
 178         fx2 = sdi->priv;
 179
 180         if (sdi->status == SR_ST_ACTIVE)
 181                 /* already in use */
 182                 return SR_ERR;
 183
 184         skip = 0;
 185         libusb_get_device_list(usb_context, &devlist);
 186         for (i = 0; devlist[i]; i++) {
 187                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 188                         sr_err("failed to get device descriptor: %d", err);
 189                         continue;
 190                 }
 191
 192                 if (des.idVendor != fx2->profile->fw_vid || des.idProduct != fx2->profile->fw_pid)
 193                         continue;
 194
 195                 if (sdi->status == SR_ST_INITIALIZING) {
 196                         if (skip != device_index) {
 197                                 /* Skip devices of this type that aren't the one we want. */
 198                                 skip += 1;
 199                                 continue;
 200                         }
 201                 } else if (sdi->status == SR_ST_INACTIVE) {
 202                         /*
 203                          * This device is fully enumerated, so we need to find this
 204                          * device by vendor, product, bus and address.
 205                          */
 206                         if (libusb_get_bus_number(devlist[i]) != fx2->usb->bus
 207                                 || libusb_get_device_address(devlist[i]) != fx2->usb->address)
 208                                 /* this is not the one */
 209                                 continue;
 210                 }
 211
 212                 if (!(err = libusb_open(devlist[i], &fx2->usb->devhdl))) {
 213                         if (fx2->usb->address == 0xff)
 214                                 /*
 215                                  * first time we touch this device after firmware upload,
 216                                  * so we don't know the address yet.
 217                                  */
 218                                 fx2->usb->address = libusb_get_device_address(devlist[i]);
 219
 220                         sdi->status = SR_ST_ACTIVE;
 221                         sr_info("saleae: opened device %d on %d.%d interface %d",
 222                                   sdi->index, fx2->usb->bus,
 223                                   fx2->usb->address, USB_INTERFACE);
 224                 } else {
 225                         sr_err("failed to open device: %d", err);
 226                 }
 227
 228                 /* if we made it here, we handled the device one way or another */
 229                 break;
 230         }
 231         libusb_free_device_list(devlist, 1);
 232
 233         if (sdi->status != SR_ST_ACTIVE)
 234                 return SR_ERR;
 235
 236         return SR_OK;
 237 }
 238
 239 static void close_device(struct sr_device_instance *sdi)
 240 {
 241         struct fx2_device *fx2;
 242
 243         fx2 = sdi->priv;
 244
 245         if (fx2->usb->devhdl == NULL)
 246                 return;
 247
 248         sr_info("saleae: closing device %d on %d.%d interface %d", sdi->index,
 249                 fx2->usb->bus, fx2->usb->address, USB_INTERFACE);
 250         libusb_release_interface(fx2->usb->devhdl, USB_INTERFACE);
 251         libusb_close(fx2->usb->devhdl);
 252         fx2->usb->devhdl = NULL;
 253         sdi->status = SR_ST_INACTIVE;
 254 }
 255
 256 static int configure_probes(struct fx2_device *fx2, GSList *probes)
 257 {
 258         struct sr_probe *probe;
 259         GSList *l;
 260         int probe_bit, stage, i;
 261         char *tc;
 262
 263         fx2->probe_mask = 0;
 264         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 265                 fx2->trigger_mask[i] = 0;
 266                 fx2->trigger_value[i] = 0;
 267         }
 268
 269         stage = -1;
 270         for (l = probes; l; l = l->next) {
 271                 probe = (struct sr_probe *)l->data;
 272                 if (probe->enabled == FALSE)
 273                         continue;
 274                 probe_bit = 1 << (probe->index - 1);
 275                 fx2->probe_mask |= probe_bit;
 276                 if (!(probe->trigger))
 277                         continue;
 278
 279                 stage = 0;
 280                 for (tc = probe->trigger; *tc; tc++) {
 281                         fx2->trigger_mask[stage] |= probe_bit;
 282                         if (*tc == '1')
 283                                 fx2->trigger_value[stage] |= probe_bit;
 284                         stage++;
 285                         if (stage > NUM_TRIGGER_STAGES)
 286                                 return SR_ERR;
 287                 }
 288         }
 289
 290         if (stage == -1)
 291                 /*
 292                  * We didn't configure any triggers, make sure acquisition
 293                  * doesn't wait for any.
 294                  */
 295                 fx2->trigger_stage = TRIGGER_FIRED;
 296         else
 297                 fx2->trigger_stage = 0;
 298
 299         return SR_OK;
 300 }
 301
 302 static struct fx2_device *fx2_device_new(void)
 303 {
 304         struct fx2_device *fx2;
 305
 306         if (!(fx2 = g_try_malloc0(sizeof(struct fx2_device)))) {
 307                 sr_err("saleae: %s: fx2 malloc failed", __func__);
 308                 return NULL;
 309         }
 310         fx2->trigger_stage = TRIGGER_FIRED;
 311         fx2->usb = NULL;
 312
 313         return fx2;
 314 }
 315
 316
 317 /*
 318  * API callbacks
 319  */
 320
 321 static int hw_init(const char *deviceinfo)
 322 {
 323         struct sr_device_instance *sdi;
 324         struct libusb_device_descriptor des;
 325         struct fx2_profile *fx2_prof;
 326         struct fx2_device *fx2;
 327         libusb_device **devlist;
 328         int err, devcnt, i, j;
 329
 330         /* Avoid compiler warnings. */
 331         (void)deviceinfo;
 332
 333         if (libusb_init(&usb_context) != 0) {
 334                 sr_err("Failed to initialize USB.");
 335                 return 0;
 336         }
 337
 338         /* Find all Saleae Logic devices and upload firmware to all of them. */
 339         devcnt = 0;
 340         libusb_get_device_list(usb_context, &devlist);
 341         for (i = 0; devlist[i]; i++) {
 342                 fx2_prof = NULL;
 343                 err = libusb_get_device_descriptor(devlist[i], &des);
 344                 if (err != 0) {
 345                         sr_err("failed to get device descriptor: %d", err);
 346                         continue;
 347                 }
 348
 349                 for (j = 0; supported_fx2[j].orig_vid; j++) {
 350                         if (des.idVendor == supported_fx2[j].orig_vid
 351                                 && des.idProduct == supported_fx2[j].orig_pid) {
 352                                 fx2_prof = &supported_fx2[j];
 353                                 break;
 354                         }
 355                 }
 356                 if (!fx2_prof)
 357                         /* not a supported VID/PID */
 358                         continue;
 359
 360                 sdi = sr_device_instance_new(devcnt, SR_ST_INITIALIZING,
 361                         fx2_prof->vendor, fx2_prof->model, fx2_prof->model_version);
 362                 if (!sdi)
 363                         return 0;
 364                 fx2 = fx2_device_new();
 365                 fx2->profile = fx2_prof;
 366                 sdi->priv = fx2;
 367                 device_instances = g_slist_append(device_instances, sdi);
 368
 369                 if (check_conf_profile(devlist[i])) {
 370                         /* Already has the firmware, so fix the new address. */
 371                         sr_dbg("Found a Saleae Logic with %s firmware.",
 372                                new_saleae_logic_firmware ? "new" : "old");
 373                         sdi->status = SR_ST_INACTIVE;
 374                         fx2->usb = sr_usb_device_instance_new
 375                             (libusb_get_bus_number(devlist[i]),
 376                              libusb_get_device_address(devlist[i]), NULL);
 377                 } else {
 378                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION, FIRMWARE) == SR_OK)
 379                                 /* Remember when the firmware on this device was updated */
 380                                 g_get_current_time(&fx2->fw_updated);
 381                         else
 382                                 sr_err("firmware upload failed for device %d", devcnt);
 383                         fx2->usb = sr_usb_device_instance_new
 384                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 385                 }
 386                 devcnt++;
 387         }
 388         libusb_free_device_list(devlist, 1);
 389
 390         return devcnt;
 391 }
 392
 393 static int hw_opendev(int device_index)
 394 {
 395         GTimeVal cur_time;
 396         struct sr_device_instance *sdi;
 397         struct fx2_device *fx2;
 398         int timediff, err;
 399
 400         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 401                 return SR_ERR;
 402         fx2 = sdi->priv;
 403
 404         /*
 405          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 406          * for the FX2 to renumerate
 407          */
 408         err = 0;
 409         if (GTV_TO_MSEC(fx2->fw_updated) > 0) {
 410                 sr_info("saleae: waiting for device to reset");
 411                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 412                 g_usleep(300*1000);
 413                 timediff = 0;
 414                 while (timediff < MAX_RENUM_DELAY) {
 415                         if ((err = sl_open_device(device_index)) == SR_OK)
 416                                 break;
 417                         g_usleep(100*1000);
 418                         g_get_current_time(&cur_time);
 419                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(fx2->fw_updated);
 420                 }
 421                 sr_info("saleae: device came back after %d ms", timediff);
 422         } else {
 423                 err = sl_open_device(device_index);
 424         }
 425
 426         if (err != SR_OK) {
 427                 sr_err("unable to open device");
 428                 return SR_ERR;
 429         }
 430         fx2 = sdi->priv;
 431
 432         err = libusb_claim_interface(fx2->usb->devhdl, USB_INTERFACE);
 433         if (err != 0) {
 434                 sr_err("Unable to claim interface: %d", err);
 435                 return SR_ERR;
 436         }
 437
 438         if (fx2->cur_samplerate == 0) {
 439                 /* Samplerate hasn't been set; default to the slowest one. */
 440                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 441                     &supported_samplerates[0]) == SR_ERR)
 442                         return SR_ERR;
 443         }
 444
 445         return SR_OK;
 446 }
 447
 448 static int hw_closedev(int device_index)
 449 {
 450         struct sr_device_instance *sdi;
 451
 452         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 453                 sr_err("logic: %s: sdi was NULL", __func__);
 454                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 455         }
 456
 457         /* TODO */
 458         close_device(sdi);
 459
 460         return SR_OK;
 461 }
 462
 463 static void hw_cleanup(void)
 464 {
 465         GSList *l;
 466         struct sr_device_instance *sdi;
 467         struct fx2_device *fx2;
 468
 469         /* Properly close and free all devices. */
 470         for (l = device_instances; l; l = l->next) {
 471                 sdi = l->data;
 472                 fx2 = sdi->priv;
 473                 close_device(sdi);
 474                 sr_usb_device_instance_free(fx2->usb);
 475                 sr_device_instance_free(sdi);
 476         }
 477
 478         g_slist_free(device_instances);
 479         device_instances = NULL;
 480
 481         if (usb_context)
 482                 libusb_exit(usb_context);
 483         usb_context = NULL;
 484 }
 485
 486 static void *hw_get_device_info(int device_index, int device_info_id)
 487 {
 488         struct sr_device_instance *sdi;
 489         struct fx2_device *fx2;
 490         void *info = NULL;
 491
 492         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 493                 return NULL;
 494         fx2 = sdi->priv;
 495
 496         switch (device_info_id) {
 497         case SR_DI_INSTANCE:
 498                 info = sdi;
 499                 break;
 500         case SR_DI_NUM_PROBES:
 501                 info = GINT_TO_POINTER(fx2->profile->num_probes);
 502                 break;
 503         case SR_DI_PROBE_NAMES:
 504                 info = probe_names;
 505                 break;
 506         case SR_DI_SAMPLERATES:
 507                 info = &samplerates;
 508                 break;
 509         case SR_DI_TRIGGER_TYPES:
 510                 info = TRIGGER_TYPES;
 511                 break;
 512         case SR_DI_CUR_SAMPLERATE:
 513                 info = &fx2->cur_samplerate;
 514                 break;
 515         }
 516
 517         return info;
 518 }
 519
 520 static int hw_get_status(int device_index)
 521 {
 522         struct sr_device_instance *sdi;
 523
 524         sdi = sr_get_device_instance(device_instances, device_index);
 525         if (sdi)
 526                 return sdi->status;
 527         else
 528                 return SR_ST_NOT_FOUND;
 529 }
 530
 531 static int *hw_get_capabilities(void)
 532 {
 533         return capabilities;
 534 }
 535
 536 static uint8_t new_firmware_divider_value(uint64_t samplerate)
 537 {
 538         switch (samplerate) {
 539         case SR_MHZ(24):
 540                 return 0xe0;
 541                 break;
 542         case SR_MHZ(16):
 543                 return 0xd5;
 544                 break;
 545         case SR_MHZ(12):
 546                 return 0xe2;
 547                 break;
 548         case SR_MHZ(8):
 549                 return 0xd4;
 550                 break;
 551         case SR_MHZ(4):
 552                 return 0xda;
 553                 break;
 554         case SR_MHZ(2):
 555                 return 0xe6;
 556                 break;
 557         case SR_MHZ(1):
 558                 return 0x8e;
 559                 break;
 560         case SR_KHZ(500):
 561                 return 0xfe;
 562                 break;
 563         case SR_KHZ(250):
 564                 return 0x9e;
 565                 break;
 566         case SR_KHZ(200):
 567                 return 0x4e;
 568                 break;
 569         }
 570
 571         /* Shouldn't happen. */
 572         sr_err("saleae: %s: Invalid samplerate %" PRIu64 "",
 573                __func__, samplerate);
 574         return 0;
 575 }
 576
 577 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 578                                         uint64_t samplerate)
 579 {
 580         struct fx2_device *fx2;
 581         uint8_t divider;
 582         int ret, result, i;
 583         unsigned char buf[2];
 584
 585         fx2 = sdi->priv;
 586         for (i = 0; supported_samplerates[i]; i++) {
 587                 if (supported_samplerates[i] == samplerate)
 588                         break;
 589         }
 590         if (supported_samplerates[i] == 0)
 591                 return SR_ERR_SAMPLERATE;
 592
 593         if (new_saleae_logic_firmware)
 594                 divider = new_firmware_divider_value(samplerate);
 595         else
 596                 divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 597
 598         sr_info("saleae: setting samplerate to %" PRIu64 " Hz (divider %d)",
 599                 samplerate, divider);
 600
 601         buf[0] = (new_saleae_logic_firmware) ? 0xd5 : 0x01;
 602         buf[1] = divider;
 603         ret = libusb_bulk_transfer(fx2->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 604                                    buf, 2, &result, 500);
 605         if (ret != 0) {
 606                 sr_err("failed to set samplerate: %d", ret);
 607                 return SR_ERR;
 608         }
 609         fx2->cur_samplerate = samplerate;
 610
 611         return SR_OK;
 612 }
 613
 614 static int hw_set_configuration(int device_index, int capability, void *value)
 615 {
 616         struct sr_device_instance *sdi;
 617         struct fx2_device *fx2;
 618         int ret;
 619         uint64_t *tmp_u64;
 620
 621         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 622                 return SR_ERR;
 623         fx2 = sdi->priv;
 624
 625         if (capability == SR_HWCAP_SAMPLERATE) {
 626                 tmp_u64 = value;
 627                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 628         } else if (capability == SR_HWCAP_PROBECONFIG) {
 629                 ret = configure_probes(fx2, (GSList *) value);
 630         } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
 631                 tmp_u64 = value;
 632                 fx2->limit_samples = *tmp_u64;
 633                 ret = SR_OK;
 634         } else {
 635                 ret = SR_ERR;
 636         }
 637
 638         return ret;
 639 }
 640
 641 static int receive_data(int fd, int revents, void *user_data)
 642 {
 643         struct timeval tv;
 644
 645         /* Avoid compiler warnings. */
 646         (void)fd;
 647         (void)revents;
 648         (void)user_data;
 649
 650         tv.tv_sec = tv.tv_usec = 0;
 651         libusb_handle_events_timeout(usb_context, &tv);
 652
 653         return TRUE;
 654 }
 655
 656 static void receive_transfer(struct libusb_transfer *transfer)
 657 {
 658         /* TODO: these statics have to move to fx2_device struct */
 659         static int num_samples = 0;
 660         static int empty_transfer_count = 0;
 661         struct sr_datafeed_packet packet;
 662         struct sr_datafeed_logic logic;
 663         struct fx2_device *fx2;
 664         int cur_buflen, trigger_offset, i;
 665         unsigned char *cur_buf, *new_buf;
 666
 667         /* hw_stop_acquisition() is telling us to stop. */
 668         if (transfer == NULL)
 669                 num_samples = -1;
 670
 671         /*
 672          * If acquisition has already ended, just free any queued up
 673          * transfer that come in.
 674          */
 675         if (num_samples == -1) {
 676                 if (transfer)
 677                         libusb_free_transfer(transfer);
 678                 return;
 679         }
 680
 681         sr_info("saleae: receive_transfer(): status %d received %d bytes",
 682                 transfer->status, transfer->actual_length);
 683
 684         /* Save incoming transfer before reusing the transfer struct. */
 685         cur_buf = transfer->buffer;
 686         cur_buflen = transfer->actual_length;
 687         fx2 = transfer->user_data;
 688
 689         /* Fire off a new request. */
 690         if (!(new_buf = g_try_malloc(4096))) {
 691                 sr_err("saleae: %s: new_buf malloc failed", __func__);
 692                 return; /* TODO: SR_ERR_MALLOC */
 693         }
 694
 695         transfer->buffer = new_buf;
 696         transfer->length = 4096;
 697         if (libusb_submit_transfer(transfer) != 0) {
 698                 /* TODO: Stop session? */
 699                 sr_err("eek");
 700         }
 701
 702         if (cur_buflen == 0) {
 703                 empty_transfer_count++;
 704                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 705                         /*
 706                          * The FX2 gave up. End the acquisition, the frontend
 707                          * will work out that the samplecount is short.
 708                          */
 709                         hw_stop_acquisition(-1, fx2->session_data);
 710                 }
 711                 return;
 712         } else {
 713                 empty_transfer_count = 0;
 714         }
 715
 716         trigger_offset = 0;
 717         if (fx2->trigger_stage >= 0) {
 718                 for (i = 0; i < cur_buflen; i++) {
 719
 720                         if ((cur_buf[i] & fx2->trigger_mask[fx2->trigger_stage]) == fx2->trigger_value[fx2->trigger_stage]) {
 721                                 /* Match on this trigger stage. */
 722                                 fx2->trigger_buffer[fx2->trigger_stage] = cur_buf[i];
 723                                 fx2->trigger_stage++;
 724
 725                                 if (fx2->trigger_stage == NUM_TRIGGER_STAGES || fx2->trigger_mask[fx2->trigger_stage] == 0) {
 726                                         /* Match on all trigger stages, we're done. */
 727                                         trigger_offset = i + 1;
 728
 729                                         /*
 730                                          * TODO: Send pre-trigger buffer to session bus.
 731                                          * Tell the frontend we hit the trigger here.
 732                                          */
 733                                         packet.type = SR_DF_TRIGGER;
 734                                         packet.payload = NULL;
 735                                         sr_session_bus(fx2->session_data, &packet);
 736
 737                                         /*
 738                                          * Send the samples that triggered it, since we're
 739                                          * skipping past them.
 740                                          */
 741                                         packet.type = SR_DF_LOGIC;
 742                                         packet.payload = &logic;
 743                                         logic.length = fx2->trigger_stage;
 744                                         logic.unitsize = 1;
 745                                         logic.data = fx2->trigger_buffer;
 746                                         sr_session_bus(fx2->session_data, &packet);
 747
 748                                         fx2->trigger_stage = TRIGGER_FIRED;
 749                                         break;
 750                                 }
 751                                 return;
 752                         }
 753
 754                         /*
 755                          * We had a match before, but not in the next sample. However, we may
 756                          * have a match on this stage in the next bit -- trigger on 0001 will
 757                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 758                          * the next sample from the one that matched originally, which the
 759                          * counter increment at the end of the loop takes care of.
 760                          */
 761                         if (fx2->trigger_stage > 0) {
 762                                 i -= fx2->trigger_stage;
 763                                 if (i < -1)
 764                                         i = -1; /* Oops, went back past this buffer. */
 765                                 /* Reset trigger stage. */
 766                                 fx2->trigger_stage = 0;
 767                         }
 768                 }
 769         }
 770
 771         if (fx2->trigger_stage == TRIGGER_FIRED) {
 772                 /* Send the incoming transfer to the session bus. */
 773                 packet.type = SR_DF_LOGIC;
 774                 packet.payload = &logic;
 775                 logic.length = cur_buflen - trigger_offset;
 776                 logic.unitsize = 1;
 777                 logic.data = cur_buf + trigger_offset;
 778                 sr_session_bus(fx2->session_data, &packet);
 779                 g_free(cur_buf);
 780
 781                 num_samples += cur_buflen;
 782                 if (fx2->limit_samples && (unsigned int) num_samples > fx2->limit_samples) {
 783                         hw_stop_acquisition(-1, fx2->session_data);
 784                 }
 785         } else {
 786                 /*
 787                  * TODO: Buffer pre-trigger data in capture
 788                  * ratio-sized buffer.
 789                  */
 790         }
 791 }
 792
 793 static int hw_start_acquisition(int device_index, gpointer session_data)
 794 {
 795         struct sr_device_instance *sdi;
 796         struct sr_datafeed_packet *packet;
 797         struct sr_datafeed_header *header;
 798         struct fx2_device *fx2;
 799         struct libusb_transfer *transfer;
 800         const struct libusb_pollfd **lupfd;
 801         int size, i;
 802         unsigned char *buf;
 803
 804         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 805                 return SR_ERR;
 806         fx2 = sdi->priv;
 807         fx2->session_data = session_data;
 808
 809         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 810                 sr_err("saleae: %s: packet malloc failed", __func__);
 811                 return SR_ERR_MALLOC;
 812         }
 813
 814         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 815                 sr_err("saleae: %s: header malloc failed", __func__);
 816                 return SR_ERR_MALLOC;
 817         }
 818
 819         /* Start with 2K transfer, subsequently increased to 4K. */
 820         size = 2048;
 821         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 822                 if (!(buf = g_try_malloc(size))) {
 823                         sr_err("saleae: %s: buf malloc failed", __func__);
 824                         return SR_ERR_MALLOC;
 825                 }
 826                 transfer = libusb_alloc_transfer(0);
 827                 libusb_fill_bulk_transfer(transfer, fx2->usb->devhdl,
 828                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 829                                 receive_transfer, fx2, 40);
 830                 if (libusb_submit_transfer(transfer) != 0) {
 831                         /* TODO: Free them all. */
 832                         libusb_free_transfer(transfer);
 833                         g_free(buf);
 834                         return SR_ERR;
 835                 }
 836                 size = 4096;
 837         }
 838
 839         lupfd = libusb_get_pollfds(usb_context);
 840         for (i = 0; lupfd[i]; i++)
 841                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 842                               NULL);
 843         free(lupfd); /* NOT g_free()! */
 844
 845         packet->type = SR_DF_HEADER;
 846         packet->payload = header;
 847         header->feed_version = 1;
 848         gettimeofday(&header->starttime, NULL);
 849         header->samplerate = fx2->cur_samplerate;
 850         header->num_logic_probes = fx2->profile->num_probes;
 851         sr_session_bus(session_data, packet);
 852         g_free(header);
 853         g_free(packet);
 854
 855         return SR_OK;
 856 }
 857
 858 /* This stops acquisition on ALL devices, ignoring device_index. */
 859 static void hw_stop_acquisition(int device_index, gpointer session_data)
 860 {
 861         struct sr_datafeed_packet packet;
 862
 863         /* Avoid compiler warnings. */
 864         (void)device_index;
 865
 866         packet.type = SR_DF_END;
 867         sr_session_bus(session_data, &packet);
 868
 869         receive_transfer(NULL);
 870
 871         /* TODO: Need to cancel and free any queued up transfers. */
 872 }
 873
 874 SR_PRIV struct sr_device_plugin saleae_logic_plugin_info = {
 875         .name = "saleae-logic",
 876         .longname = "Saleae Logic",
 877         .api_version = 1,
 878         .init = hw_init,
 879         .cleanup = hw_cleanup,
 880         .opendev = hw_opendev,
 881         .closedev = hw_closedev,
 882         .get_device_info = hw_get_device_info,
 883         .get_status = hw_get_status,
 884         .get_capabilities = hw_get_capabilities,
 885         .set_configuration = hw_set_configuration,
 886         .start_acquisition = hw_start_acquisition,
 887         .stop_acquisition = hw_stop_acquisition,
 888 };