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 hwcaps[] = {
  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_dev_inst, maintained by opendev()/closedev(). */
  91 static GSList *dev_insts = NULL;
  92 static libusb_context *usb_context = NULL;
  93
  94 static int new_saleae_logic_firmware = 0;
  95
  96 static int hw_config_set(int dev_index, int hwcap, void *value);
  97 static int hw_stop_acquisition(int dev_index, gpointer session_dev_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_dev(int dev_index)
 169 {
 170         libusb_device **devlist;
 171         struct libusb_device_descriptor des;
 172         struct sr_dev_inst *sdi;
 173         struct fx2_dev *fx2;
 174         int err, skip, i;
 175
 176         if (!(sdi = sr_dev_inst_get(dev_insts, dev_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("logic: failed to get device descriptor: %d", err);
 189                         continue;
 190                 }
 191
 192                 if (des.idVendor != fx2->profile->fw_vid
 193                     || des.idProduct != fx2->profile->fw_pid)
 194                         continue;
 195
 196                 if (sdi->status == SR_ST_INITIALIZING) {
 197                         if (skip != dev_index) {
 198                                 /* Skip devices of this type that aren't the one we want. */
 199                                 skip += 1;
 200                                 continue;
 201                         }
 202                 } else if (sdi->status == SR_ST_INACTIVE) {
 203                         /*
 204                          * This device is fully enumerated, so we need to find
 205                          * this device by vendor, product, bus and address.
 206                          */
 207                         if (libusb_get_bus_number(devlist[i]) != fx2->usb->bus
 208                                 || libusb_get_device_address(devlist[i]) != fx2->usb->address)
 209                                 /* this is not the one */
 210                                 continue;
 211                 }
 212
 213                 if (!(err = libusb_open(devlist[i], &fx2->usb->devhdl))) {
 214                         if (fx2->usb->address == 0xff)
 215                                 /*
 216                                  * first time we touch this device after firmware upload,
 217                                  * so we don't know the address yet.
 218                                  */
 219                                 fx2->usb->address = libusb_get_device_address(devlist[i]);
 220
 221                         sdi->status = SR_ST_ACTIVE;
 222                         sr_info("logic: opened device %d on %d.%d interface %d",
 223                                 sdi->index, fx2->usb->bus,
 224                                 fx2->usb->address, USB_INTERFACE);
 225                 } else {
 226                         sr_err("logic: failed to open device: %d", err);
 227                 }
 228
 229                 /* if we made it here, we handled the device one way or another */
 230                 break;
 231         }
 232         libusb_free_device_list(devlist, 1);
 233
 234         if (sdi->status != SR_ST_ACTIVE)
 235                 return SR_ERR;
 236
 237         return SR_OK;
 238 }
 239
 240 static void close_dev(struct sr_dev_inst *sdi)
 241 {
 242         struct fx2_dev *fx2;
 243
 244         fx2 = sdi->priv;
 245
 246         if (fx2->usb->devhdl == NULL)
 247                 return;
 248
 249         sr_info("logic: closing device %d on %d.%d interface %d", sdi->index,
 250                 fx2->usb->bus, fx2->usb->address, USB_INTERFACE);
 251         libusb_release_interface(fx2->usb->devhdl, USB_INTERFACE);
 252         libusb_close(fx2->usb->devhdl);
 253         fx2->usb->devhdl = NULL;
 254         sdi->status = SR_ST_INACTIVE;
 255 }
 256
 257 static int configure_probes(struct fx2_dev *fx2, GSList *probes)
 258 {
 259         struct sr_probe *probe;
 260         GSList *l;
 261         int probe_bit, stage, i;
 262         char *tc;
 263
 264         fx2->probe_mask = 0;
 265         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 266                 fx2->trigger_mask[i] = 0;
 267                 fx2->trigger_value[i] = 0;
 268         }
 269
 270         stage = -1;
 271         for (l = probes; l; l = l->next) {
 272                 probe = (struct sr_probe *)l->data;
 273                 if (probe->enabled == FALSE)
 274                         continue;
 275                 probe_bit = 1 << (probe->index - 1);
 276                 fx2->probe_mask |= probe_bit;
 277                 if (!(probe->trigger))
 278                         continue;
 279
 280                 stage = 0;
 281                 for (tc = probe->trigger; *tc; tc++) {
 282                         fx2->trigger_mask[stage] |= probe_bit;
 283                         if (*tc == '1')
 284                                 fx2->trigger_value[stage] |= probe_bit;
 285                         stage++;
 286                         if (stage > NUM_TRIGGER_STAGES)
 287                                 return SR_ERR;
 288                 }
 289         }
 290
 291         if (stage == -1)
 292                 /*
 293                  * We didn't configure any triggers, make sure acquisition
 294                  * doesn't wait for any.
 295                  */
 296                 fx2->trigger_stage = TRIGGER_FIRED;
 297         else
 298                 fx2->trigger_stage = 0;
 299
 300         return SR_OK;
 301 }
 302
 303 static struct fx2_dev *fx2_dev_new(void)
 304 {
 305         struct fx2_dev *fx2;
 306
 307         if (!(fx2 = g_try_malloc0(sizeof(struct fx2_dev)))) {
 308                 sr_err("logic: %s: fx2 malloc failed", __func__);
 309                 return NULL;
 310         }
 311         fx2->trigger_stage = TRIGGER_FIRED;
 312         fx2->usb = NULL;
 313
 314         return fx2;
 315 }
 316
 317
 318 /*
 319  * API callbacks
 320  */
 321
 322 static int hw_init(const char *devinfo)
 323 {
 324         struct sr_dev_inst *sdi;
 325         struct libusb_device_descriptor des;
 326         struct fx2_profile *fx2_prof;
 327         struct fx2_dev *fx2;
 328         libusb_device **devlist;
 329         int err, devcnt, i, j;
 330
 331         /* Avoid compiler warnings. */
 332         (void)devinfo;
 333
 334         if (libusb_init(&usb_context) != 0) {
 335                 sr_err("logic: Failed to initialize USB.");
 336                 return 0;
 337         }
 338
 339         /* Find all Saleae Logic devices and upload firmware to all of them. */
 340         devcnt = 0;
 341         libusb_get_device_list(usb_context, &devlist);
 342         for (i = 0; devlist[i]; i++) {
 343                 fx2_prof = NULL;
 344                 err = libusb_get_device_descriptor(devlist[i], &des);
 345                 if (err != 0) {
 346                         sr_err("logic: failed to get device descriptor: %d",
 347                                err);
 348                         continue;
 349                 }
 350
 351                 for (j = 0; supported_fx2[j].orig_vid; j++) {
 352                         if (des.idVendor == supported_fx2[j].orig_vid
 353                                 && des.idProduct == supported_fx2[j].orig_pid) {
 354                                 fx2_prof = &supported_fx2[j];
 355                                 break;
 356                         }
 357                 }
 358                 if (!fx2_prof)
 359                         /* not a supported VID/PID */
 360                         continue;
 361
 362                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 363                         fx2_prof->vendor, fx2_prof->model, fx2_prof->model_version);
 364                 if (!sdi)
 365                         return 0;
 366                 fx2 = fx2_dev_new();
 367                 fx2->profile = fx2_prof;
 368                 sdi->priv = fx2;
 369                 dev_insts = g_slist_append(dev_insts, sdi);
 370
 371                 if (check_conf_profile(devlist[i])) {
 372                         /* Already has the firmware, so fix the new address. */
 373                         sr_dbg("logic: Found a Saleae Logic with %s firmware.",
 374                                new_saleae_logic_firmware ? "new" : "old");
 375                         sdi->status = SR_ST_INACTIVE;
 376                         fx2->usb = sr_usb_dev_inst_new
 377                             (libusb_get_bus_number(devlist[i]),
 378                              libusb_get_device_address(devlist[i]), NULL);
 379                 } else {
 380                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION, FIRMWARE) == SR_OK)
 381                                 /* Remember when the firmware on this device was updated */
 382                                 g_get_current_time(&fx2->fw_updated);
 383                         else
 384                                 sr_err("logic: firmware upload failed for "
 385                                        "device %d", devcnt);
 386                         fx2->usb = sr_usb_dev_inst_new
 387                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 388                 }
 389                 devcnt++;
 390         }
 391         libusb_free_device_list(devlist, 1);
 392
 393         return devcnt;
 394 }
 395
 396 static int hw_opendev(int dev_index)
 397 {
 398         GTimeVal cur_time;
 399         struct sr_dev_inst *sdi;
 400         struct fx2_dev *fx2;
 401         int timediff, err;
 402
 403         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 404                 return SR_ERR;
 405         fx2 = sdi->priv;
 406
 407         /*
 408          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 409          * for the FX2 to renumerate
 410          */
 411         err = 0;
 412         if (GTV_TO_MSEC(fx2->fw_updated) > 0) {
 413                 sr_info("logic: waiting for device to reset");
 414                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 415                 g_usleep(300 * 1000);
 416                 timediff = 0;
 417                 while (timediff < MAX_RENUM_DELAY) {
 418                         if ((err = sl_open_dev(dev_index)) == SR_OK)
 419                                 break;
 420                         g_usleep(100 * 1000);
 421                         g_get_current_time(&cur_time);
 422                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(fx2->fw_updated);
 423                 }
 424                 sr_info("logic: device came back after %d ms", timediff);
 425         } else {
 426                 err = sl_open_dev(dev_index);
 427         }
 428
 429         if (err != SR_OK) {
 430                 sr_err("logic: unable to open device");
 431                 return SR_ERR;
 432         }
 433         fx2 = sdi->priv;
 434
 435         err = libusb_claim_interface(fx2->usb->devhdl, USB_INTERFACE);
 436         if (err != 0) {
 437                 sr_err("logic: Unable to claim interface: %d", err);
 438                 return SR_ERR;
 439         }
 440
 441         if (fx2->cur_samplerate == 0) {
 442                 /* Samplerate hasn't been set; default to the slowest one. */
 443                 if (hw_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 444                     &supported_samplerates[0]) == SR_ERR)
 445                         return SR_ERR;
 446         }
 447
 448         return SR_OK;
 449 }
 450
 451 static int hw_closedev(int dev_index)
 452 {
 453         struct sr_dev_inst *sdi;
 454
 455         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 456                 sr_err("logic: %s: sdi was NULL", __func__);
 457                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 458         }
 459
 460         /* TODO */
 461         close_dev(sdi);
 462
 463         return SR_OK;
 464 }
 465
 466 static int hw_cleanup(void)
 467 {
 468         GSList *l;
 469         struct sr_dev_inst *sdi;
 470         struct fx2_dev *fx2;
 471         int ret = SR_OK;
 472
 473         /* Properly close and free all devices. */
 474         for (l = dev_insts; l; l = l->next) {
 475                 if (!(sdi = l->data)) {
 476                         /* Log error, but continue cleaning up the rest. */
 477                         sr_err("logic: %s: sdi was NULL, continuing", __func__);
 478                         ret = SR_ERR_BUG;
 479                         continue;
 480                 }
 481                 if (!(fx2 = sdi->priv)) {
 482                         /* Log error, but continue cleaning up the rest. */
 483                         sr_err("logic: %s: sdi->priv was NULL, continuing",
 484                                __func__);
 485                         ret = SR_ERR_BUG;
 486                         continue;
 487                 }
 488                 close_dev(sdi);
 489                 sr_usb_dev_inst_free(fx2->usb);
 490                 sr_dev_inst_free(sdi);
 491         }
 492
 493         g_slist_free(dev_insts);
 494         dev_insts = NULL;
 495
 496         if (usb_context)
 497                 libusb_exit(usb_context);
 498         usb_context = NULL;
 499
 500         return ret;
 501 }
 502
 503 static void *hw_get_dev_info(int dev_index, int dev_info_id)
 504 {
 505         struct sr_dev_inst *sdi;
 506         struct fx2_dev *fx2;
 507         void *info = NULL;
 508
 509         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 510                 return NULL;
 511         fx2 = sdi->priv;
 512
 513         switch (dev_info_id) {
 514         case SR_DI_INST:
 515                 info = sdi;
 516                 break;
 517         case SR_DI_NUM_PROBES:
 518                 info = GINT_TO_POINTER(fx2->profile->num_probes);
 519                 break;
 520         case SR_DI_PROBE_NAMES:
 521                 info = probe_names;
 522                 break;
 523         case SR_DI_SAMPLERATES:
 524                 info = &samplerates;
 525                 break;
 526         case SR_DI_TRIGGER_TYPES:
 527                 info = TRIGGER_TYPES;
 528                 break;
 529         case SR_DI_CUR_SAMPLERATE:
 530                 info = &fx2->cur_samplerate;
 531                 break;
 532         }
 533
 534         return info;
 535 }
 536
 537 static int hw_get_status(int dev_index)
 538 {
 539         struct sr_dev_inst *sdi;
 540
 541         sdi = sr_dev_inst_get(dev_insts, dev_index);
 542         if (sdi)
 543                 return sdi->status;
 544         else
 545                 return SR_ST_NOT_FOUND;
 546 }
 547
 548 static int *hw_hwcap_get_all(void)
 549 {
 550         return hwcaps;
 551 }
 552
 553 static uint8_t new_firmware_divider_value(uint64_t samplerate)
 554 {
 555         switch (samplerate) {
 556         case SR_MHZ(24):
 557                 return 0xe0;
 558                 break;
 559         case SR_MHZ(16):
 560                 return 0xd5;
 561                 break;
 562         case SR_MHZ(12):
 563                 return 0xe2;
 564                 break;
 565         case SR_MHZ(8):
 566                 return 0xd4;
 567                 break;
 568         case SR_MHZ(4):
 569                 return 0xda;
 570                 break;
 571         case SR_MHZ(2):
 572                 return 0xe6;
 573                 break;
 574         case SR_MHZ(1):
 575                 return 0x8e;
 576                 break;
 577         case SR_KHZ(500):
 578                 return 0xfe;
 579                 break;
 580         case SR_KHZ(250):
 581                 return 0x9e;
 582                 break;
 583         case SR_KHZ(200):
 584                 return 0x4e;
 585                 break;
 586         }
 587
 588         /* Shouldn't happen. */
 589         sr_err("logic: %s: Invalid samplerate %" PRIu64 "",
 590                __func__, samplerate);
 591         return 0;
 592 }
 593
 594 static int config_set_samplerate(struct sr_dev_inst *sdi, uint64_t samplerate)
 595 {
 596         struct fx2_dev *fx2;
 597         uint8_t divider;
 598         int ret, result, i;
 599         unsigned char buf[2];
 600
 601         fx2 = sdi->priv;
 602         for (i = 0; supported_samplerates[i]; i++) {
 603                 if (supported_samplerates[i] == samplerate)
 604                         break;
 605         }
 606         if (supported_samplerates[i] == 0)
 607                 return SR_ERR_SAMPLERATE;
 608
 609         if (new_saleae_logic_firmware)
 610                 divider = new_firmware_divider_value(samplerate);
 611         else
 612                 divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 613
 614         sr_info("logic: setting samplerate to %" PRIu64 " Hz (divider %d)",
 615                 samplerate, divider);
 616
 617         buf[0] = (new_saleae_logic_firmware) ? 0xd5 : 0x01;
 618         buf[1] = divider;
 619         ret = libusb_bulk_transfer(fx2->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 620                                    buf, 2, &result, 500);
 621         if (ret != 0) {
 622                 sr_err("logic: failed to set samplerate: %d", ret);
 623                 return SR_ERR;
 624         }
 625         fx2->cur_samplerate = samplerate;
 626
 627         return SR_OK;
 628 }
 629
 630 static int hw_config_set(int dev_index, int hwcap, void *value)
 631 {
 632         struct sr_dev_inst *sdi;
 633         struct fx2_dev *fx2;
 634         int ret;
 635         uint64_t *tmp_u64;
 636
 637         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 638                 return SR_ERR;
 639         fx2 = sdi->priv;
 640
 641         if (hwcap == SR_HWCAP_SAMPLERATE) {
 642                 tmp_u64 = value;
 643                 ret = config_set_samplerate(sdi, *tmp_u64);
 644         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 645                 ret = configure_probes(fx2, (GSList *) value);
 646         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 647                 tmp_u64 = value;
 648                 fx2->limit_samples = *tmp_u64;
 649                 ret = SR_OK;
 650         } else {
 651                 ret = SR_ERR;
 652         }
 653
 654         return ret;
 655 }
 656
 657 static int receive_data(int fd, int revents, void *user_data)
 658 {
 659         struct timeval tv;
 660
 661         /* Avoid compiler warnings. */
 662         (void)fd;
 663         (void)revents;
 664         (void)user_data;
 665
 666         tv.tv_sec = tv.tv_usec = 0;
 667         libusb_handle_events_timeout(usb_context, &tv);
 668
 669         return TRUE;
 670 }
 671
 672 static void receive_transfer(struct libusb_transfer *transfer)
 673 {
 674         /* TODO: these statics have to move to fx2_dev struct */
 675         static int num_samples = 0;
 676         static int empty_transfer_count = 0;
 677         struct sr_datafeed_packet packet;
 678         struct sr_datafeed_logic logic;
 679         struct fx2_dev *fx2;
 680         int cur_buflen, trigger_offset, i;
 681         unsigned char *cur_buf, *new_buf;
 682
 683         /* hw_stop_acquisition() is telling us to stop. */
 684         if (transfer == NULL)
 685                 num_samples = -1;
 686
 687         /*
 688          * If acquisition has already ended, just free any queued up
 689          * transfer that come in.
 690          */
 691         if (num_samples == -1) {
 692                 if (transfer)
 693                         libusb_free_transfer(transfer);
 694                 return;
 695         }
 696
 697         sr_info("logic: receive_transfer(): status %d received %d bytes",
 698                 transfer->status, transfer->actual_length);
 699
 700         /* Save incoming transfer before reusing the transfer struct. */
 701         cur_buf = transfer->buffer;
 702         cur_buflen = transfer->actual_length;
 703         fx2 = transfer->user_data;
 704
 705         /* Fire off a new request. */
 706         if (!(new_buf = g_try_malloc(4096))) {
 707                 sr_err("logic: %s: new_buf malloc failed", __func__);
 708                 return; /* TODO: SR_ERR_MALLOC */
 709         }
 710
 711         transfer->buffer = new_buf;
 712         transfer->length = 4096;
 713         if (libusb_submit_transfer(transfer) != 0) {
 714                 /* TODO: Stop session? */
 715                 /* TODO: Better error message. */
 716                 sr_err("logic: %s: libusb_submit_transfer error", __func__);
 717         }
 718
 719         if (cur_buflen == 0) {
 720                 empty_transfer_count++;
 721                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 722                         /*
 723                          * The FX2 gave up. End the acquisition, the frontend
 724                          * will work out that the samplecount is short.
 725                          */
 726                         hw_stop_acquisition(-1, fx2->session_data);
 727                 }
 728                 return;
 729         } else {
 730                 empty_transfer_count = 0;
 731         }
 732
 733         trigger_offset = 0;
 734         if (fx2->trigger_stage >= 0) {
 735                 for (i = 0; i < cur_buflen; i++) {
 736
 737                         if ((cur_buf[i] & fx2->trigger_mask[fx2->trigger_stage]) == fx2->trigger_value[fx2->trigger_stage]) {
 738                                 /* Match on this trigger stage. */
 739                                 fx2->trigger_buffer[fx2->trigger_stage] = cur_buf[i];
 740                                 fx2->trigger_stage++;
 741
 742                                 if (fx2->trigger_stage == NUM_TRIGGER_STAGES || fx2->trigger_mask[fx2->trigger_stage] == 0) {
 743                                         /* Match on all trigger stages, we're done. */
 744                                         trigger_offset = i + 1;
 745
 746                                         /*
 747                                          * TODO: Send pre-trigger buffer to session bus.
 748                                          * Tell the frontend we hit the trigger here.
 749                                          */
 750                                         packet.type = SR_DF_TRIGGER;
 751                                         packet.payload = NULL;
 752                                         sr_session_bus(fx2->session_data, &packet);
 753
 754                                         /*
 755                                          * Send the samples that triggered it, since we're
 756                                          * skipping past them.
 757                                          */
 758                                         packet.type = SR_DF_LOGIC;
 759                                         packet.payload = &logic;
 760                                         logic.length = fx2->trigger_stage;
 761                                         logic.unitsize = 1;
 762                                         logic.data = fx2->trigger_buffer;
 763                                         sr_session_bus(fx2->session_data, &packet);
 764
 765                                         fx2->trigger_stage = TRIGGER_FIRED;
 766                                         break;
 767                                 }
 768                                 return;
 769                         }
 770
 771                         /*
 772                          * We had a match before, but not in the next sample. However, we may
 773                          * have a match on this stage in the next bit -- trigger on 0001 will
 774                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 775                          * the next sample from the one that matched originally, which the
 776                          * counter increment at the end of the loop takes care of.
 777                          */
 778                         if (fx2->trigger_stage > 0) {
 779                                 i -= fx2->trigger_stage;
 780                                 if (i < -1)
 781                                         i = -1; /* Oops, went back past this buffer. */
 782                                 /* Reset trigger stage. */
 783                                 fx2->trigger_stage = 0;
 784                         }
 785                 }
 786         }
 787
 788         if (fx2->trigger_stage == TRIGGER_FIRED) {
 789                 /* Send the incoming transfer to the session bus. */
 790                 packet.type = SR_DF_LOGIC;
 791                 packet.payload = &logic;
 792                 logic.length = cur_buflen - trigger_offset;
 793                 logic.unitsize = 1;
 794                 logic.data = cur_buf + trigger_offset;
 795                 sr_session_bus(fx2->session_data, &packet);
 796                 g_free(cur_buf);
 797
 798                 num_samples += cur_buflen;
 799                 if (fx2->limit_samples && (unsigned int) num_samples > fx2->limit_samples) {
 800                         hw_stop_acquisition(-1, fx2->session_data);
 801                 }
 802         } else {
 803                 /*
 804                  * TODO: Buffer pre-trigger data in capture
 805                  * ratio-sized buffer.
 806                  */
 807         }
 808 }
 809
 810 static int hw_start_acquisition(int dev_index, gpointer session_data)
 811 {
 812         struct sr_dev_inst *sdi;
 813         struct sr_datafeed_packet *packet;
 814         struct sr_datafeed_header *header;
 815         struct fx2_dev *fx2;
 816         struct libusb_transfer *transfer;
 817         const struct libusb_pollfd **lupfd;
 818         int size, i;
 819         unsigned char *buf;
 820
 821         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 822                 return SR_ERR;
 823         fx2 = sdi->priv;
 824         fx2->session_data = session_data;
 825
 826         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 827                 sr_err("logic: %s: packet malloc failed", __func__);
 828                 return SR_ERR_MALLOC;
 829         }
 830
 831         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 832                 sr_err("logic: %s: header malloc failed", __func__);
 833                 return SR_ERR_MALLOC;
 834         }
 835
 836         /* Start with 2K transfer, subsequently increased to 4K. */
 837         size = 2048;
 838         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 839                 if (!(buf = g_try_malloc(size))) {
 840                         sr_err("logic: %s: buf malloc failed", __func__);
 841                         return SR_ERR_MALLOC;
 842                 }
 843                 transfer = libusb_alloc_transfer(0);
 844                 libusb_fill_bulk_transfer(transfer, fx2->usb->devhdl,
 845                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 846                                 receive_transfer, fx2, 40);
 847                 if (libusb_submit_transfer(transfer) != 0) {
 848                         /* TODO: Free them all. */
 849                         libusb_free_transfer(transfer);
 850                         g_free(buf);
 851                         return SR_ERR;
 852                 }
 853                 size = 4096;
 854         }
 855
 856         lupfd = libusb_get_pollfds(usb_context);
 857         for (i = 0; lupfd[i]; i++)
 858                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 859                               NULL);
 860         free(lupfd); /* NOT g_free()! */
 861
 862         packet->type = SR_DF_HEADER;
 863         packet->payload = header;
 864         header->feed_version = 1;
 865         gettimeofday(&header->starttime, NULL);
 866         header->samplerate = fx2->cur_samplerate;
 867         header->num_logic_probes = fx2->profile->num_probes;
 868         sr_session_bus(session_data, packet);
 869         g_free(header);
 870         g_free(packet);
 871
 872         return SR_OK;
 873 }
 874
 875 /* This stops acquisition on ALL devices, ignoring dev_index. */
 876 static int hw_stop_acquisition(int dev_index, gpointer session_data)
 877 {
 878         struct sr_datafeed_packet packet;
 879
 880         /* Avoid compiler warnings. */
 881         (void)dev_index;
 882
 883         packet.type = SR_DF_END;
 884         sr_session_bus(session_data, &packet);
 885
 886         receive_transfer(NULL);
 887
 888         /* TODO: Need to cancel and free any queued up transfers. */
 889
 890         return SR_OK;
 891 }
 892
 893 SR_PRIV struct sr_dev_plugin saleae_logic_plugin_info = {
 894         .name = "saleae-logic",
 895         .longname = "Saleae Logic",
 896         .api_version = 1,
 897         .init = hw_init,
 898         .cleanup = hw_cleanup,
 899         .opendev = hw_opendev,
 900         .closedev = hw_closedev,
 901         .get_dev_info = hw_get_dev_info,
 902         .get_status = hw_get_status,
 903         .hwcap_get_all = hw_hwcap_get_all,
 904         .config_set = hw_config_set,
 905         .start_acquisition = hw_start_acquisition,
 906         .stop_acquisition = hw_stop_acquisition,
 907 };