hardware/fx2lafw/fx2lafw.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <inttypes.h>
  25 #include <libusb.h>
  26 #include "libsigrok.h"
  27 #include "libsigrok-internal.h"
  28 #include "fx2lafw.h"
  29 #include "command.h"
  30
  31 static const struct fx2lafw_profile supported_fx2[] = {
  32         /*
  33          * CWAV USBee AX
  34          * EE Electronics ESLA201A
  35          * ARMFLY AX-Pro
  36          */
  37         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  38                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw",
  39                 0 },
  40         /*
  41          * CWAV USBee DX
  42          * XZL-Studio DX
  43          */
  44         { 0x08a9, 0x0015, "CWAV", "USBee DX", NULL,
  45                 FIRMWARE_DIR "/fx2lafw-cwav-usbeedx.fw",
  46                 DEV_CAPS_16BIT },
  47
  48         /*
  49          * CWAV USBee SX
  50          */
  51         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  52                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw",
  53                 0 },
  54
  55         /*
  56          * Saleae Logic
  57          * EE Electronics ESLA100
  58          * Robomotic MiniLogic
  59          * Robomotic BugLogic 3
  60          */
  61         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  62                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw",
  63                 0 },
  64
  65         /*
  66          * Default Cypress FX2 without EEPROM, e.g.:
  67          * Lcsoft Mini Board
  68          * Braintechnology USB Interface V2.x
  69          */
  70         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  71                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw",
  72                 DEV_CAPS_16BIT },
  73
  74         /*
  75          * Braintechnology USB-LPS
  76          */
  77         { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
  78                 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw",
  79                 DEV_CAPS_16BIT },
  80
  81         { 0, 0, 0, 0, 0, 0, 0 }
  82 };
  83
  84 static const int hwcaps[] = {
  85         SR_CONF_LOGIC_ANALYZER,
  86         SR_CONF_SAMPLERATE,
  87
  88         /* These are really implemented in the driver, not the hardware. */
  89         SR_CONF_LIMIT_SAMPLES,
  90         SR_CONF_CONTINUOUS,
  91         0,
  92 };
  93
  94 static const char *probe_names[] = {
  95         "0",  "1",  "2",  "3",  "4",  "5",  "6",  "7",
  96         "8",  "9", "10", "11", "12", "13", "14", "15",
  97         NULL,
  98 };
  99
 100 static const uint64_t supported_samplerates[] = {
 101         SR_KHZ(20),
 102         SR_KHZ(25),
 103         SR_KHZ(50),
 104         SR_KHZ(100),
 105         SR_KHZ(200),
 106         SR_KHZ(250),
 107         SR_KHZ(500),
 108         SR_MHZ(1),
 109         SR_MHZ(2),
 110         SR_MHZ(3),
 111         SR_MHZ(4),
 112         SR_MHZ(6),
 113         SR_MHZ(8),
 114         SR_MHZ(12),
 115         SR_MHZ(16),
 116         SR_MHZ(24),
 117         0,
 118 };
 119
 120 static const struct sr_samplerates samplerates = {
 121         .low  = 0,
 122         .high = 0,
 123         .step = 0,
 124         .list = supported_samplerates,
 125 };
 126
 127 SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
 128 static struct sr_dev_driver *di = &fx2lafw_driver_info;
 129 static int hw_dev_close(struct sr_dev_inst *sdi);
 130 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi);
 131 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 132
 133 /**
 134  * Check the USB configuration to determine if this is an fx2lafw device.
 135  *
 136  * @return TRUE if the device's configuration profile match fx2lafw
 137  *         configuration, FALSE otherwise.
 138  */
 139 static gboolean check_conf_profile(libusb_device *dev)
 140 {
 141         struct libusb_device_descriptor des;
 142         struct libusb_device_handle *hdl;
 143         gboolean ret;
 144         unsigned char strdesc[64];
 145
 146         hdl = NULL;
 147         ret = FALSE;
 148         while (!ret) {
 149                 /* Assume the FW has not been loaded, unless proven wrong. */
 150                 if (libusb_get_device_descriptor(dev, &des) != 0)
 151                         break;
 152
 153                 if (libusb_open(dev, &hdl) != 0)
 154                         break;
 155
 156                 if (libusb_get_string_descriptor_ascii(hdl,
 157                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 158                         break;
 159                 if (strncmp((const char *)strdesc, "sigrok", 6))
 160                         break;
 161
 162                 if (libusb_get_string_descriptor_ascii(hdl,
 163                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 164                         break;
 165                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 166                         break;
 167
 168                 /* If we made it here, it must be an fx2lafw. */
 169                 ret = TRUE;
 170         }
 171         if (hdl)
 172                 libusb_close(hdl);
 173
 174         return ret;
 175 }
 176
 177 static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
 178 {
 179         libusb_device **devlist;
 180         struct libusb_device_descriptor des;
 181         struct dev_context *devc;
 182         struct drv_context *drvc;
 183         struct version_info vi;
 184         int ret, skip, i, device_count;
 185         uint8_t revid;
 186
 187         drvc = di->priv;
 188         devc = sdi->priv;
 189
 190         if (sdi->status == SR_ST_ACTIVE)
 191                 /* Device is already in use. */
 192                 return SR_ERR;
 193
 194         skip = 0;
 195         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 196         if (device_count < 0) {
 197                 sr_err("Failed to get device list: %s.",
 198                        libusb_error_name(device_count));
 199                 return SR_ERR;
 200         }
 201
 202         for (i = 0; i < device_count; i++) {
 203                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 204                         sr_err("Failed to get device descriptor: %s.",
 205                                libusb_error_name(ret));
 206                         continue;
 207                 }
 208
 209                 if (des.idVendor != devc->profile->vid
 210                     || des.idProduct != devc->profile->pid)
 211                         continue;
 212
 213                 if (sdi->status == SR_ST_INITIALIZING) {
 214                         if (skip != sdi->index) {
 215                                 /* Skip devices of this type that aren't the one we want. */
 216                                 skip += 1;
 217                                 continue;
 218                         }
 219                 } else if (sdi->status == SR_ST_INACTIVE) {
 220                         /*
 221                          * This device is fully enumerated, so we need to find
 222                          * this device by vendor, product, bus and address.
 223                          */
 224                         if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 225                                 || libusb_get_device_address(devlist[i]) != devc->usb->address)
 226                                 /* This is not the one. */
 227                                 continue;
 228                 }
 229
 230                 if (!(ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
 231                         if (devc->usb->address == 0xff)
 232                                 /*
 233                                  * First time we touch this device after FW
 234                                  * upload, so we don't know the address yet.
 235                                  */
 236                                 devc->usb->address = libusb_get_device_address(devlist[i]);
 237                 } else {
 238                         sr_err("Failed to open device: %s.",
 239                                libusb_error_name(ret));
 240                         break;
 241                 }
 242
 243                 ret = command_get_fw_version(devc->usb->devhdl, &vi);
 244                 if (ret != SR_OK) {
 245                         sr_err("Failed to get firmware version.");
 246                         break;
 247                 }
 248
 249                 ret = command_get_revid_version(devc->usb->devhdl, &revid);
 250                 if (ret != SR_OK) {
 251                         sr_err("Failed to get REVID.");
 252                         break;
 253                 }
 254
 255                 /*
 256                  * Changes in major version mean incompatible/API changes, so
 257                  * bail out if we encounter an incompatible version.
 258                  * Different minor versions are OK, they should be compatible.
 259                  */
 260                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 261                         sr_err("Expected firmware version %d.x, "
 262                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 263                                vi.major, vi.minor);
 264                         break;
 265                 }
 266
 267                 sdi->status = SR_ST_ACTIVE;
 268                 sr_info("Opened device %d on %d.%d, "
 269                         "interface %d, firmware %d.%d.",
 270                         sdi->index, devc->usb->bus, devc->usb->address,
 271                         USB_INTERFACE, vi.major, vi.minor);
 272
 273                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 274                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 275
 276                 break;
 277         }
 278         libusb_free_device_list(devlist, 1);
 279
 280         if (sdi->status != SR_ST_ACTIVE)
 281                 return SR_ERR;
 282
 283         return SR_OK;
 284 }
 285
 286 static int configure_probes(const struct sr_dev_inst *sdi)
 287 {
 288         struct dev_context *devc;
 289         struct sr_probe *probe;
 290         GSList *l;
 291         int probe_bit, stage, i;
 292         char *tc;
 293
 294         devc = sdi->priv;
 295         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 296                 devc->trigger_mask[i] = 0;
 297                 devc->trigger_value[i] = 0;
 298         }
 299
 300         stage = -1;
 301         for (l = sdi->probes; l; l = l->next) {
 302                 probe = (struct sr_probe *)l->data;
 303                 if (probe->enabled == FALSE)
 304                         continue;
 305
 306                 if (probe->index > 7)
 307                         devc->sample_wide = TRUE;
 308
 309                 probe_bit = 1 << (probe->index);
 310                 if (!(probe->trigger))
 311                         continue;
 312
 313                 stage = 0;
 314                 for (tc = probe->trigger; *tc; tc++) {
 315                         devc->trigger_mask[stage] |= probe_bit;
 316                         if (*tc == '1')
 317                                 devc->trigger_value[stage] |= probe_bit;
 318                         stage++;
 319                         if (stage > NUM_TRIGGER_STAGES)
 320                                 return SR_ERR;
 321                 }
 322         }
 323
 324         if (stage == -1)
 325                 /*
 326                  * We didn't configure any triggers, make sure acquisition
 327                  * doesn't wait for any.
 328                  */
 329                 devc->trigger_stage = TRIGGER_FIRED;
 330         else
 331                 devc->trigger_stage = 0;
 332
 333         return SR_OK;
 334 }
 335
 336 static struct dev_context *fx2lafw_dev_new(void)
 337 {
 338         struct dev_context *devc;
 339
 340         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 341                 sr_err("Device context malloc failed.");
 342                 return NULL;
 343         }
 344
 345         devc->trigger_stage = TRIGGER_FIRED;
 346
 347         return devc;
 348 }
 349
 350 static int clear_instances(void)
 351 {
 352         GSList *l;
 353         struct sr_dev_inst *sdi;
 354         struct drv_context *drvc;
 355         struct dev_context *devc;
 356         int ret;
 357
 358         drvc = di->priv;
 359         ret = SR_OK;
 360         for (l = drvc->instances; l; l = l->next) {
 361                 if (!(sdi = l->data)) {
 362                         /* Log error, but continue cleaning up the rest. */
 363                         sr_err("sdi was NULL, continuing.");
 364                         ret = SR_ERR_BUG;
 365                         continue;
 366                 }
 367                 if (!(devc = sdi->priv)) {
 368                         /* Log error, but continue cleaning up the rest. */
 369                         sr_err("sdi->priv was NULL, continuing.");
 370                         ret = SR_ERR_BUG;
 371                         continue;
 372                 }
 373                 hw_dev_close(sdi);
 374                 sr_usb_dev_inst_free(devc->usb);
 375                 sdi = l->data;
 376                 sr_dev_inst_free(sdi);
 377         }
 378
 379         g_slist_free(drvc->instances);
 380         drvc->instances = NULL;
 381
 382         return ret;
 383 }
 384
 385 static int hw_init(struct sr_context *sr_ctx)
 386 {
 387         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
 388 }
 389
 390 static GSList *hw_scan(GSList *options)
 391 {
 392         GSList *devices;
 393         struct libusb_device_descriptor des;
 394         struct sr_dev_inst *sdi;
 395         const struct fx2lafw_profile *prof;
 396         struct drv_context *drvc;
 397         struct dev_context *devc;
 398         struct sr_probe *probe;
 399         libusb_device **devlist;
 400         int devcnt, num_logic_probes, ret, i, j;
 401
 402         (void)options;
 403
 404         drvc = di->priv;
 405
 406         /* This scan always invalidates any previous scans. */
 407         clear_instances();
 408
 409         /* Find all fx2lafw compatible devices and upload firmware to them. */
 410         devices = NULL;
 411         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 412         for (i = 0; devlist[i]; i++) {
 413
 414                 if ((ret = libusb_get_device_descriptor(
 415                      devlist[i], &des)) != 0) {
 416                         sr_warn("Failed to get device descriptor: %s.",
 417                                 libusb_error_name(ret));
 418                         continue;
 419                 }
 420
 421                 prof = NULL;
 422                 for (j = 0; supported_fx2[j].vid; j++) {
 423                         if (des.idVendor == supported_fx2[j].vid &&
 424                                 des.idProduct == supported_fx2[j].pid) {
 425                                 prof = &supported_fx2[j];
 426                         }
 427                 }
 428
 429                 /* Skip if the device was not found. */
 430                 if (!prof)
 431                         continue;
 432
 433                 devcnt = g_slist_length(drvc->instances);
 434                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 435                         prof->vendor, prof->model, prof->model_version);
 436                 if (!sdi)
 437                         return NULL;
 438                 sdi->driver = di;
 439
 440                 /* Fill in probelist according to this device's profile. */
 441                 num_logic_probes = prof->dev_caps & DEV_CAPS_16BIT ? 16 : 8;
 442                 for (j = 0; j < num_logic_probes; j++) {
 443                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 444                                         probe_names[j])))
 445                                 return NULL;
 446                         sdi->probes = g_slist_append(sdi->probes, probe);
 447                 }
 448
 449                 devc = fx2lafw_dev_new();
 450                 devc->profile = prof;
 451                 sdi->priv = devc;
 452                 drvc->instances = g_slist_append(drvc->instances, sdi);
 453                 devices = g_slist_append(devices, sdi);
 454
 455                 if (check_conf_profile(devlist[i])) {
 456                         /* Already has the firmware, so fix the new address. */
 457                         sr_dbg("Found an fx2lafw device.");
 458                         sdi->status = SR_ST_INACTIVE;
 459                         devc->usb = sr_usb_dev_inst_new
 460                             (libusb_get_bus_number(devlist[i]),
 461                              libusb_get_device_address(devlist[i]), NULL);
 462                 } else {
 463                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 464                                 prof->firmware) == SR_OK)
 465                                 /* Store when this device's FW was updated. */
 466                                 devc->fw_updated = g_get_monotonic_time();
 467                         else
 468                                 sr_err("Firmware upload failed for "
 469                                        "device %d.", devcnt);
 470                         devc->usb = sr_usb_dev_inst_new
 471                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 472                 }
 473         }
 474         libusb_free_device_list(devlist, 1);
 475
 476         return devices;
 477 }
 478
 479 static GSList *hw_dev_list(void)
 480 {
 481         return ((struct drv_context *)(di->priv))->instances;
 482 }
 483
 484 static int hw_dev_open(struct sr_dev_inst *sdi)
 485 {
 486         struct dev_context *devc;
 487         int ret;
 488         int64_t timediff_us, timediff_ms;
 489
 490         devc = sdi->priv;
 491
 492         /*
 493          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 494          * milliseconds for the FX2 to renumerate.
 495          */
 496         ret = SR_ERR;
 497         if (devc->fw_updated > 0) {
 498                 sr_info("Waiting for device to reset.");
 499                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 500                 g_usleep(300 * 1000);
 501                 timediff_ms = 0;
 502                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 503                         if ((ret = fx2lafw_dev_open(sdi)) == SR_OK)
 504                                 break;
 505                         g_usleep(100 * 1000);
 506
 507                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 508                         timediff_ms = timediff_us / 1000;
 509                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 510                 }
 511                 if (ret != SR_OK) {
 512                         sr_err("Device failed to renumerate.");
 513                         return SR_ERR;
 514                 }
 515                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 516         } else {
 517                 sr_info("Firmware upload was not needed.");
 518                 ret = fx2lafw_dev_open(sdi);
 519         }
 520
 521         if (ret != SR_OK) {
 522                 sr_err("Unable to open device.");
 523                 return SR_ERR;
 524         }
 525
 526         devc = sdi->priv;
 527
 528         ret = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 529         if (ret != 0) {
 530                 switch(ret) {
 531                 case LIBUSB_ERROR_BUSY:
 532                         sr_err("Unable to claim USB interface. Another "
 533                                "program or driver has already claimed it.");
 534                         break;
 535                 case LIBUSB_ERROR_NO_DEVICE:
 536                         sr_err("Device has been disconnected.");
 537                         break;
 538                 default:
 539                         sr_err("Unable to claim interface: %s.",
 540                                libusb_error_name(ret));
 541                         break;
 542                 }
 543
 544                 return SR_ERR;
 545         }
 546
 547         if (devc->cur_samplerate == 0) {
 548                 /* Samplerate hasn't been set; default to the slowest one. */
 549                 if (config_set(SR_CONF_SAMPLERATE, &supported_samplerates[0],
 550                                 sdi) == SR_ERR)
 551                         return SR_ERR;
 552         }
 553
 554         return SR_OK;
 555 }
 556
 557 static int hw_dev_close(struct sr_dev_inst *sdi)
 558 {
 559         struct dev_context *devc;
 560
 561         devc = sdi->priv;
 562         if (devc->usb->devhdl == NULL)
 563                 return SR_ERR;
 564
 565         sr_info("Closing device %d on %d.%d, interface %d.",
 566                 sdi->index, devc->usb->bus, devc->usb->address, USB_INTERFACE);
 567         libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
 568         libusb_close(devc->usb->devhdl);
 569         devc->usb->devhdl = NULL;
 570         sdi->status = SR_ST_INACTIVE;
 571
 572         return SR_OK;
 573 }
 574
 575 static int hw_cleanup(void)
 576 {
 577         struct drv_context *drvc;
 578         int ret;
 579
 580         if (!(drvc = di->priv))
 581                 return SR_OK;
 582
 583         ret = clear_instances();
 584
 585         g_free(drvc);
 586         di->priv = NULL;
 587
 588         return ret;
 589 }
 590
 591 static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
 592 {
 593         struct dev_context *devc;
 594
 595         switch (id) {
 596         case SR_CONF_SAMPLERATE:
 597                 if (sdi) {
 598                         devc = sdi->priv;
 599                         *data = &devc->cur_samplerate;
 600                 } else
 601                         return SR_ERR;
 602                 break;
 603         default:
 604                 return SR_ERR_ARG;
 605         }
 606
 607         return SR_OK;
 608 }
 609
 610 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
 611 {
 612         struct dev_context *devc;
 613         int ret;
 614
 615         devc = sdi->priv;
 616
 617         if (id == SR_CONF_SAMPLERATE) {
 618                 devc->cur_samplerate = *(const uint64_t *)value;
 619                 ret = SR_OK;
 620         } else if (id == SR_CONF_LIMIT_SAMPLES) {
 621                 devc->limit_samples = *(const uint64_t *)value;
 622                 ret = SR_OK;
 623         } else {
 624                 ret = SR_ERR;
 625         }
 626
 627         return ret;
 628 }
 629
 630 static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
 631 {
 632
 633         (void)sdi;
 634
 635         switch (key) {
 636         case SR_CONF_DEVICE_OPTIONS:
 637                 *data = hwcaps;
 638                 break;
 639         case SR_CONF_SAMPLERATE:
 640                 *data = &samplerates;
 641                 break;
 642         case SR_CONF_TRIGGER_TYPE:
 643                 *data = TRIGGER_TYPE;
 644                 break;
 645         default:
 646                 return SR_ERR_ARG;
 647         }
 648
 649         return SR_OK;
 650 }
 651
 652 static int receive_data(int fd, int revents, void *cb_data)
 653 {
 654         struct timeval tv;
 655         struct drv_context *drvc;
 656
 657         (void)fd;
 658         (void)revents;
 659         (void)cb_data;
 660
 661         drvc = di->priv;
 662
 663         tv.tv_sec = tv.tv_usec = 0;
 664         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 665
 666         return TRUE;
 667 }
 668
 669 static void abort_acquisition(struct dev_context *devc)
 670 {
 671         int i;
 672
 673         devc->num_samples = -1;
 674
 675         for (i = devc->num_transfers - 1; i >= 0; i--) {
 676                 if (devc->transfers[i])
 677                         libusb_cancel_transfer(devc->transfers[i]);
 678         }
 679 }
 680
 681 static void finish_acquisition(struct dev_context *devc)
 682 {
 683         struct sr_datafeed_packet packet;
 684         struct drv_context *drvc = di->priv;
 685         const struct libusb_pollfd **lupfd;
 686         int i;
 687
 688         /* Terminate session. */
 689         packet.type = SR_DF_END;
 690         sr_session_send(devc->session_dev_id, &packet);
 691
 692         /* Remove fds from polling. */
 693         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 694         for (i = 0; lupfd[i]; i++)
 695                 sr_source_remove(lupfd[i]->fd);
 696         free(lupfd); /* NOT g_free()! */
 697
 698         devc->num_transfers = 0;
 699         g_free(devc->transfers);
 700 }
 701
 702 static void free_transfer(struct libusb_transfer *transfer)
 703 {
 704         struct dev_context *devc;
 705         unsigned int i;
 706
 707         devc = transfer->user_data;
 708
 709         g_free(transfer->buffer);
 710         transfer->buffer = NULL;
 711         libusb_free_transfer(transfer);
 712
 713         for (i = 0; i < devc->num_transfers; i++) {
 714                 if (devc->transfers[i] == transfer) {
 715                         devc->transfers[i] = NULL;
 716                         break;
 717                 }
 718         }
 719
 720         devc->submitted_transfers--;
 721         if (devc->submitted_transfers == 0)
 722                 finish_acquisition(devc);
 723 }
 724
 725 static void resubmit_transfer(struct libusb_transfer *transfer)
 726 {
 727         int ret;
 728
 729         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 730                 return;
 731
 732         free_transfer(transfer);
 733         /* TODO: Stop session? */
 734
 735         sr_err("%s: %s", __func__, libusb_error_name(ret));
 736 }
 737
 738 static void receive_transfer(struct libusb_transfer *transfer)
 739 {
 740         gboolean packet_has_error = FALSE;
 741         struct sr_datafeed_packet packet;
 742         struct sr_datafeed_logic logic;
 743         struct dev_context *devc;
 744         int trigger_offset, i, sample_width, cur_sample_count;
 745         int trigger_offset_bytes;
 746         uint8_t *cur_buf;
 747
 748         devc = transfer->user_data;
 749
 750         /*
 751          * If acquisition has already ended, just free any queued up
 752          * transfer that come in.
 753          */
 754         if (devc->num_samples == -1) {
 755                 free_transfer(transfer);
 756                 return;
 757         }
 758
 759         sr_info("receive_transfer(): status %d received %d bytes.",
 760                 transfer->status, transfer->actual_length);
 761
 762         /* Save incoming transfer before reusing the transfer struct. */
 763         cur_buf = transfer->buffer;
 764         sample_width = devc->sample_wide ? 2 : 1;
 765         cur_sample_count = transfer->actual_length / sample_width;
 766
 767         switch (transfer->status) {
 768         case LIBUSB_TRANSFER_NO_DEVICE:
 769                 abort_acquisition(devc);
 770                 free_transfer(transfer);
 771                 return;
 772         case LIBUSB_TRANSFER_COMPLETED:
 773         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 774                 break;
 775         default:
 776                 packet_has_error = TRUE;
 777                 break;
 778         }
 779
 780         if (transfer->actual_length == 0 || packet_has_error) {
 781                 devc->empty_transfer_count++;
 782                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 783                         /*
 784                          * The FX2 gave up. End the acquisition, the frontend
 785                          * will work out that the samplecount is short.
 786                          */
 787                         abort_acquisition(devc);
 788                         free_transfer(transfer);
 789                 } else {
 790                         resubmit_transfer(transfer);
 791                 }
 792                 return;
 793         } else {
 794                 devc->empty_transfer_count = 0;
 795         }
 796
 797         trigger_offset = 0;
 798         if (devc->trigger_stage >= 0) {
 799                 for (i = 0; i < cur_sample_count; i++) {
 800
 801                         const uint16_t cur_sample = devc->sample_wide ?
 802                                 *((const uint16_t*)cur_buf + i) :
 803                                 *((const uint8_t*)cur_buf + i);
 804
 805                         if ((cur_sample & devc->trigger_mask[devc->trigger_stage]) ==
 806                                 devc->trigger_value[devc->trigger_stage]) {
 807                                 /* Match on this trigger stage. */
 808                                 devc->trigger_buffer[devc->trigger_stage] = cur_sample;
 809                                 devc->trigger_stage++;
 810
 811                                 if (devc->trigger_stage == NUM_TRIGGER_STAGES ||
 812                                         devc->trigger_mask[devc->trigger_stage] == 0) {
 813                                         /* Match on all trigger stages, we're done. */
 814                                         trigger_offset = i + 1;
 815
 816                                         /*
 817                                          * TODO: Send pre-trigger buffer to session bus.
 818                                          * Tell the frontend we hit the trigger here.
 819                                          */
 820                                         packet.type = SR_DF_TRIGGER;
 821                                         packet.payload = NULL;
 822                                         sr_session_send(devc->session_dev_id, &packet);
 823
 824                                         /*
 825                                          * Send the samples that triggered it,
 826                                          * since we're skipping past them.
 827                                          */
 828                                         packet.type = SR_DF_LOGIC;
 829                                         packet.payload = &logic;
 830                                         logic.unitsize = sizeof(*devc->trigger_buffer);
 831                                         logic.length = devc->trigger_stage * logic.unitsize;
 832                                         logic.data = devc->trigger_buffer;
 833                                         sr_session_send(devc->session_dev_id, &packet);
 834
 835                                         devc->trigger_stage = TRIGGER_FIRED;
 836                                         break;
 837                                 }
 838                         } else if (devc->trigger_stage > 0) {
 839                                 /*
 840                                  * We had a match before, but not in the next sample. However, we may
 841                                  * have a match on this stage in the next bit -- trigger on 0001 will
 842                                  * fail on seeing 00001, so we need to go back to stage 0 -- but at
 843                                  * the next sample from the one that matched originally, which the
 844                                  * counter increment at the end of the loop takes care of.
 845                                  */
 846                                 i -= devc->trigger_stage;
 847                                 if (i < -1)
 848                                         i = -1; /* Oops, went back past this buffer. */
 849                                 /* Reset trigger stage. */
 850                                 devc->trigger_stage = 0;
 851                         }
 852                 }
 853         }
 854
 855         if (devc->trigger_stage == TRIGGER_FIRED) {
 856                 /* Send the incoming transfer to the session bus. */
 857                 trigger_offset_bytes = trigger_offset * sample_width;
 858                 packet.type = SR_DF_LOGIC;
 859                 packet.payload = &logic;
 860                 logic.length = transfer->actual_length - trigger_offset_bytes;
 861                 logic.unitsize = sample_width;
 862                 logic.data = cur_buf + trigger_offset_bytes;
 863                 sr_session_send(devc->session_dev_id, &packet);
 864
 865                 devc->num_samples += cur_sample_count;
 866                 if (devc->limit_samples &&
 867                         (unsigned int)devc->num_samples > devc->limit_samples) {
 868                         abort_acquisition(devc);
 869                         free_transfer(transfer);
 870                         return;
 871                 }
 872         } else {
 873                 /*
 874                  * TODO: Buffer pre-trigger data in capture
 875                  * ratio-sized buffer.
 876                  */
 877         }
 878
 879         resubmit_transfer(transfer);
 880 }
 881
 882 static unsigned int to_bytes_per_ms(unsigned int samplerate)
 883 {
 884         return samplerate / 1000;
 885 }
 886
 887 static size_t get_buffer_size(struct dev_context *devc)
 888 {
 889         size_t s;
 890
 891         /*
 892          * The buffer should be large enough to hold 10ms of data and
 893          * a multiple of 512.
 894          */
 895         s = 10 * to_bytes_per_ms(devc->cur_samplerate);
 896         return (s + 511) & ~511;
 897 }
 898
 899 static unsigned int get_number_of_transfers(struct dev_context *devc)
 900 {
 901         unsigned int n;
 902
 903         /* Total buffer size should be able to hold about 500ms of data. */
 904         n = 500 * to_bytes_per_ms(devc->cur_samplerate) / get_buffer_size(devc);
 905
 906         if (n > NUM_SIMUL_TRANSFERS)
 907                 return NUM_SIMUL_TRANSFERS;
 908
 909         return n;
 910 }
 911
 912 static unsigned int get_timeout(struct dev_context *devc)
 913 {
 914         size_t total_size;
 915         unsigned int timeout;
 916
 917         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 918         timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
 919         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 920 }
 921
 922 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 923                 void *cb_data)
 924 {
 925         struct sr_datafeed_packet packet;
 926         struct sr_datafeed_header header;
 927         struct dev_context *devc;
 928         struct drv_context *drvc;
 929         struct libusb_transfer *transfer;
 930         const struct libusb_pollfd **lupfd;
 931         unsigned int i, timeout, num_transfers;
 932         int ret;
 933         unsigned char *buf;
 934         size_t size;
 935
 936         drvc = di->priv;
 937         devc = sdi->priv;
 938
 939         if (devc->submitted_transfers != 0)
 940                 return SR_ERR;
 941
 942         if (configure_probes(sdi) != SR_OK) {
 943                 sr_err("Failed to configure probes.");
 944                 return SR_ERR;
 945         }
 946
 947         devc->session_dev_id = cb_data;
 948         devc->num_samples = 0;
 949         devc->empty_transfer_count = 0;
 950
 951         timeout = get_timeout(devc);
 952         num_transfers = get_number_of_transfers(devc);
 953         size = get_buffer_size(devc);
 954
 955         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 956         if (!devc->transfers) {
 957                 sr_err("USB transfers malloc failed.");
 958                 return SR_ERR_MALLOC;
 959         }
 960
 961         devc->num_transfers = num_transfers;
 962
 963         for (i = 0; i < num_transfers; i++) {
 964                 if (!(buf = g_try_malloc(size))) {
 965                         sr_err("USB transfer buffer malloc failed.");
 966                         return SR_ERR_MALLOC;
 967                 }
 968                 transfer = libusb_alloc_transfer(0);
 969                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 970                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 971                                 receive_transfer, devc, timeout);
 972                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 973                         sr_err("Failed to submit transfer: %s.",
 974                                libusb_error_name(ret));
 975                         libusb_free_transfer(transfer);
 976                         g_free(buf);
 977                         abort_acquisition(devc);
 978                         return SR_ERR;
 979                 }
 980                 devc->transfers[i] = transfer;
 981                 devc->submitted_transfers++;
 982         }
 983
 984         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 985         for (i = 0; lupfd[i]; i++)
 986                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 987                               timeout, receive_data, NULL);
 988         free(lupfd); /* NOT g_free()! */
 989
 990         packet.type = SR_DF_HEADER;
 991         packet.payload = &header;
 992         header.feed_version = 1;
 993         gettimeofday(&header.starttime, NULL);
 994         sr_session_send(cb_data, &packet);
 995
 996         if ((ret = command_start_acquisition(devc->usb->devhdl,
 997                 devc->cur_samplerate, devc->sample_wide)) != SR_OK) {
 998                 abort_acquisition(devc);
 999                 return ret;
1000         }
1001
1002         return SR_OK;
1003 }
1004
1005 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
1006 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
1007 {
1008         (void)cb_data;
1009
1010         abort_acquisition(sdi->priv);
1011
1012         return SR_OK;
1013 }
1014
1015 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
1016         .name = "fx2lafw",
1017         .longname = "fx2lafw (generic driver for FX2 based LAs)",
1018         .api_version = 1,
1019         .init = hw_init,
1020         .cleanup = hw_cleanup,
1021         .scan = hw_scan,
1022         .dev_list = hw_dev_list,
1023         .dev_clear = clear_instances,
1024         .config_get = config_get,
1025         .config_set = config_set,
1026         .config_list = config_list,
1027         .dev_open = hw_dev_open,
1028         .dev_close = hw_dev_close,
1029         .dev_acquisition_start = hw_dev_acquisition_start,
1030         .dev_acquisition_stop = hw_dev_acquisition_stop,
1031         .priv = NULL,
1032 };