hardware/saleae-logic16/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   5  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   6  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <glib.h>
  23 #include <libusb.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <math.h>
  27 #include "libsigrok.h"
  28 #include "libsigrok-internal.h"
  29 #include "protocol.h"
  30
  31 #define LOGIC16_VID 0x21a9
  32 #define LOGIC16_PID 0x1001
  33 #define NUM_PROBES  16
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42
  43 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  44 static struct sr_dev_driver *di = &saleae_logic16_driver_info;
  45
  46 static const int32_t hwopts[] = {
  47         SR_CONF_CONN,
  48 };
  49
  50 static const int32_t hwcaps[] = {
  51         SR_CONF_LOGIC_ANALYZER,
  52         SR_CONF_SAMPLERATE,
  53         SR_CONF_VOLTAGE_THRESHOLD,
  54
  55         /* These are really implemented in the driver, not the hardware. */
  56         SR_CONF_LIMIT_SAMPLES,
  57         SR_CONF_CONTINUOUS,
  58 };
  59
  60 static const char *probe_names[NUM_PROBES + 1] = {
  61         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  62         "9", "10", "11", "12", "13", "14", "15",
  63         NULL,
  64 };
  65
  66 static const struct {
  67         enum voltage_range range;
  68         gdouble low;
  69         gdouble high;
  70 } volt_thresholds[] = {
  71         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  72         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  73 };
  74
  75 static const uint64_t samplerates[] = {
  76         SR_KHZ(500),
  77         SR_MHZ(1),
  78         SR_MHZ(2),
  79         SR_MHZ(4),
  80         SR_MHZ(5),
  81         SR_MHZ(8),
  82         SR_MHZ(10),
  83         SR_KHZ(12500),
  84         SR_MHZ(16),
  85         SR_MHZ(25),
  86         SR_MHZ(32),
  87         SR_MHZ(40),
  88         SR_MHZ(80),
  89         SR_MHZ(100),
  90 };
  91
  92 static int init(struct sr_context *sr_ctx)
  93 {
  94         return std_init(sr_ctx, di, LOG_PREFIX);
  95 }
  96
  97 static gboolean check_conf_profile(libusb_device *dev)
  98 {
  99         struct libusb_device_descriptor des;
 100         struct libusb_device_handle *hdl;
 101         gboolean ret;
 102         unsigned char strdesc[64];
 103
 104         hdl = NULL;
 105         ret = FALSE;
 106         while (!ret) {
 107                 /* Assume the FW has not been loaded, unless proven wrong. */
 108                 if (libusb_get_device_descriptor(dev, &des) != 0)
 109                         break;
 110
 111                 if (libusb_open(dev, &hdl) != 0)
 112                         break;
 113
 114                 if (libusb_get_string_descriptor_ascii(hdl,
 115                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 116                         break;
 117                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 118                         break;
 119
 120                 if (libusb_get_string_descriptor_ascii(hdl,
 121                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 122                         break;
 123                 if (strcmp((const char *)strdesc, "Logic S/16"))
 124                         break;
 125
 126                 /* If we made it here, it must be a configured Logic16. */
 127                 ret = TRUE;
 128         }
 129         if (hdl)
 130                 libusb_close(hdl);
 131
 132         return ret;
 133 }
 134
 135 static GSList *scan(GSList *options)
 136 {
 137         struct drv_context *drvc;
 138         struct dev_context *devc;
 139         struct sr_dev_inst *sdi;
 140         struct sr_usb_dev_inst *usb;
 141         struct sr_probe *probe;
 142         struct sr_config *src;
 143         GSList *l, *devices, *conn_devices;
 144         struct libusb_device_descriptor des;
 145         libusb_device **devlist;
 146         int devcnt, ret, i, j;
 147         const char *conn;
 148
 149         drvc = di->priv;
 150
 151         conn = NULL;
 152         for (l = options; l; l = l->next) {
 153                 src = l->data;
 154                 switch (src->key) {
 155                 case SR_CONF_CONN:
 156                         conn = g_variant_get_string(src->data, NULL);
 157                         break;
 158                 }
 159         }
 160         if (conn)
 161                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 162         else
 163                 conn_devices = NULL;
 164
 165         /* Find all Logic16 devices and upload firmware to them. */
 166         devices = NULL;
 167         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 168         for (i = 0; devlist[i]; i++) {
 169                 if (conn) {
 170                         usb = NULL;
 171                         for (l = conn_devices; l; l = l->next) {
 172                                 usb = l->data;
 173                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 174                                     && usb->address == libusb_get_device_address(devlist[i]))
 175                                         break;
 176                         }
 177                         if (!l)
 178                                 /* This device matched none of the ones that
 179                                  * matched the conn specification. */
 180                                 continue;
 181                 }
 182
 183                 if ((ret = libusb_get_device_descriptor( devlist[i], &des)) != 0) {
 184                         sr_warn("Failed to get device descriptor: %s.",
 185                                 libusb_error_name(ret));
 186                         continue;
 187                 }
 188
 189                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 190                         continue;
 191
 192                 devcnt = g_slist_length(drvc->instances);
 193                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 194                                       "Saleae", "Logic16", NULL);
 195                 if (!sdi)
 196                         return NULL;
 197                 sdi->driver = di;
 198
 199                 for (j = 0; probe_names[j]; j++) {
 200                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 201                                                    probe_names[j])))
 202                                 return NULL;
 203                         sdi->probes = g_slist_append(sdi->probes, probe);
 204                 }
 205
 206                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 207                         return NULL;
 208                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 209                 sdi->priv = devc;
 210                 drvc->instances = g_slist_append(drvc->instances, sdi);
 211                 devices = g_slist_append(devices, sdi);
 212
 213                 if (check_conf_profile(devlist[i])) {
 214                         /* Already has the firmware, so fix the new address. */
 215                         sr_dbg("Found a Logic16 device.");
 216                         sdi->status = SR_ST_INACTIVE;
 217                         sdi->inst_type = SR_INST_USB;
 218                         sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
 219                                                         libusb_get_device_address(devlist[i]), NULL);
 220                 } else {
 221                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 222                                                   FX2_FIRMWARE) == SR_OK)
 223                                 /* Store when this device's FW was updated. */
 224                                 devc->fw_updated = g_get_monotonic_time();
 225                         else
 226                                 sr_err("Firmware upload failed for "
 227                                        "device %d.", devcnt);
 228                         sdi->inst_type = SR_INST_USB;
 229                         sdi->conn = sr_usb_dev_inst_new (libusb_get_bus_number(devlist[i]),
 230                                                          0xff, NULL);
 231                 }
 232         }
 233         libusb_free_device_list(devlist, 1);
 234         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 235
 236         return devices;
 237 }
 238
 239 static GSList *dev_list(void)
 240 {
 241         struct drv_context *drvc;
 242
 243         drvc = di->priv;
 244
 245         return drvc->instances;
 246 }
 247
 248 static int dev_clear(void)
 249 {
 250         return std_dev_clear(di, NULL);
 251 }
 252
 253 static int logic16_dev_open(struct sr_dev_inst *sdi)
 254 {
 255         libusb_device **devlist;
 256         struct sr_usb_dev_inst *usb;
 257         struct libusb_device_descriptor des;
 258         struct drv_context *drvc;
 259         int ret, skip, i, device_count;
 260
 261         drvc = di->priv;
 262         usb = sdi->conn;
 263
 264         if (sdi->status == SR_ST_ACTIVE)
 265                 /* Device is already in use. */
 266                 return SR_ERR;
 267
 268         skip = 0;
 269         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 270         if (device_count < 0) {
 271                 sr_err("Failed to get device list: %s.",
 272                        libusb_error_name(device_count));
 273                 return SR_ERR;
 274         }
 275
 276         for (i = 0; i < device_count; i++) {
 277                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 278                         sr_err("Failed to get device descriptor: %s.",
 279                                libusb_error_name(ret));
 280                         continue;
 281                 }
 282
 283                 if (des.idVendor != LOGIC16_VID
 284                     || des.idProduct != LOGIC16_PID)
 285                         continue;
 286
 287                 if (sdi->status == SR_ST_INITIALIZING) {
 288                         if (skip != sdi->index) {
 289                                 /* Skip devices of this type that aren't the one we want. */
 290                                 skip += 1;
 291                                 continue;
 292                         }
 293                 } else if (sdi->status == SR_ST_INACTIVE) {
 294                         /*
 295                          * This device is fully enumerated, so we need to find
 296                          * this device by vendor, product, bus and address.
 297                          */
 298                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 299                                 || libusb_get_device_address(devlist[i]) != usb->address)
 300                                 /* This is not the one. */
 301                                 continue;
 302                 }
 303
 304                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 305                         if (usb->address == 0xff)
 306                                 /*
 307                                  * First time we touch this device after FW
 308                                  * upload, so we don't know the address yet.
 309                                  */
 310                                 usb->address = libusb_get_device_address(devlist[i]);
 311                 } else {
 312                         sr_err("Failed to open device: %s.",
 313                                libusb_error_name(ret));
 314                         break;
 315                 }
 316
 317                 if ((ret = saleae_logic16_init_device(sdi)) != SR_OK) {
 318                         sr_err("Failed to init device.");
 319                         break;
 320                 }
 321
 322                 sdi->status = SR_ST_ACTIVE;
 323                 sr_info("Opened device %d on %d.%d, "
 324                         "interface %d.",
 325                         sdi->index, usb->bus, usb->address,
 326                         USB_INTERFACE);
 327
 328                 break;
 329         }
 330         libusb_free_device_list(devlist, 1);
 331
 332         if (sdi->status != SR_ST_ACTIVE)
 333                 return SR_ERR;
 334
 335         return SR_OK;
 336 }
 337
 338 static int dev_open(struct sr_dev_inst *sdi)
 339 {
 340         struct sr_usb_dev_inst *usb;
 341         struct dev_context *devc;
 342         int ret;
 343         int64_t timediff_us, timediff_ms;
 344
 345         devc = sdi->priv;
 346         usb = sdi->conn;
 347
 348         /*
 349          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 350          * milliseconds for the FX2 to renumerate.
 351          */
 352         ret = SR_ERR;
 353         if (devc->fw_updated > 0) {
 354                 sr_info("Waiting for device to reset.");
 355                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 356                 g_usleep(300 * 1000);
 357                 timediff_ms = 0;
 358                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 359                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 360                                 break;
 361                         g_usleep(100 * 1000);
 362
 363                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 364                         timediff_ms = timediff_us / 1000;
 365                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 366                 }
 367                 if (ret != SR_OK) {
 368                         sr_err("Device failed to renumerate.");
 369                         return SR_ERR;
 370                 }
 371                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 372         } else {
 373                 sr_info("Firmware upload was not needed.");
 374                 ret = logic16_dev_open(sdi);
 375         }
 376
 377         if (ret != SR_OK) {
 378                 sr_err("Unable to open device.");
 379                 return SR_ERR;
 380         }
 381
 382         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 383         if (ret != 0) {
 384                 switch(ret) {
 385                 case LIBUSB_ERROR_BUSY:
 386                         sr_err("Unable to claim USB interface. Another "
 387                                "program or driver has already claimed it.");
 388                         break;
 389                 case LIBUSB_ERROR_NO_DEVICE:
 390                         sr_err("Device has been disconnected.");
 391                         break;
 392                 default:
 393                         sr_err("Unable to claim interface: %s.",
 394                                libusb_error_name(ret));
 395                         break;
 396                 }
 397
 398                 return SR_ERR;
 399         }
 400
 401         if (devc->cur_samplerate == 0) {
 402                 /* Samplerate hasn't been set; default to the slowest one. */
 403                 devc->cur_samplerate = samplerates[0];
 404         }
 405
 406         return SR_OK;
 407 }
 408
 409 static int dev_close(struct sr_dev_inst *sdi)
 410 {
 411         struct sr_usb_dev_inst *usb;
 412
 413         usb = sdi->conn;
 414         if (usb->devhdl == NULL)
 415                 return SR_ERR;
 416
 417         sr_info("Closing device %d on %d.%d interface %d.",
 418                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 419         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 420         libusb_close(usb->devhdl);
 421         usb->devhdl = NULL;
 422         sdi->status = SR_ST_INACTIVE;
 423
 424         return SR_OK;
 425 }
 426
 427 static int cleanup(void)
 428 {
 429         int ret;
 430         struct drv_context *drvc;
 431
 432         if (!(drvc = di->priv))
 433                 /* Can get called on an unused driver, doesn't matter. */
 434                 return SR_OK;
 435
 436         ret = dev_clear();
 437         g_free(drvc);
 438         di->priv = NULL;
 439
 440         return ret;
 441 }
 442
 443 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 444 {
 445         struct dev_context *devc;
 446         struct sr_usb_dev_inst *usb;
 447         GVariant *range[2];
 448         char str[128];
 449         int ret;
 450         unsigned i;
 451
 452         ret = SR_OK;
 453         switch (key) {
 454         case SR_CONF_CONN:
 455                 if (!sdi || !sdi->conn)
 456                         return SR_ERR_ARG;
 457                 usb = sdi->conn;
 458                 if (usb->address == 255)
 459                         /* Device still needs to re-enumerate after firmware
 460                          * upload, so we don't know its (future) address. */
 461                         return SR_ERR;
 462                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 463                 *data = g_variant_new_string(str);
 464                 break;
 465         case SR_CONF_SAMPLERATE:
 466                 if (!sdi)
 467                         return SR_ERR;
 468                 devc = sdi->priv;
 469                 *data = g_variant_new_uint64(devc->cur_samplerate);
 470                 break;
 471         case SR_CONF_VOLTAGE_THRESHOLD:
 472                 if (!sdi)
 473                         return SR_ERR;
 474                 devc = sdi->priv;
 475                 ret = SR_ERR;
 476                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++)
 477                         if (devc->selected_voltage_range ==
 478                             volt_thresholds[i].range) {
 479                                 range[0] = g_variant_new_double(volt_thresholds[i].low);
 480                                 range[1] = g_variant_new_double(volt_thresholds[i].high);
 481                                 *data = g_variant_new_tuple(range, 2);
 482                                 ret = SR_OK;
 483                                 break;
 484                         }
 485                 break;
 486         default:
 487                 return SR_ERR_NA;
 488         }
 489
 490         return ret;
 491 }
 492
 493 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 494 {
 495         struct dev_context *devc;
 496         gdouble low, high;
 497         int ret;
 498         unsigned i;
 499
 500         if (sdi->status != SR_ST_ACTIVE)
 501                 return SR_ERR_DEV_CLOSED;
 502
 503         devc = sdi->priv;
 504
 505         ret = SR_OK;
 506         switch (key) {
 507         case SR_CONF_SAMPLERATE:
 508                 devc->cur_samplerate = g_variant_get_uint64(data);
 509                 break;
 510         case SR_CONF_LIMIT_SAMPLES:
 511                 devc->limit_samples = g_variant_get_uint64(data);
 512                 break;
 513         case SR_CONF_VOLTAGE_THRESHOLD:
 514                 g_variant_get(data, "(dd)", &low, &high);
 515                 ret = SR_ERR_ARG;
 516                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 517                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 518                             fabs(volt_thresholds[i].high - high) < 0.1) {
 519                                 devc->selected_voltage_range =
 520                                         volt_thresholds[i].range;
 521                                 ret = SR_OK;
 522                                 break;
 523                         }
 524                 }
 525                 break;
 526         default:
 527                 ret = SR_ERR_NA;
 528         }
 529
 530         return ret;
 531 }
 532
 533 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 534 {
 535         GVariant *gvar, *range[2];
 536         GVariantBuilder gvb;
 537         int ret;
 538         unsigned i;
 539
 540         (void)sdi;
 541
 542         ret = SR_OK;
 543         switch (key) {
 544         case SR_CONF_SCAN_OPTIONS:
 545                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 546                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 547                 break;
 548         case SR_CONF_DEVICE_OPTIONS:
 549                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 550                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 551                 break;
 552         case SR_CONF_SAMPLERATE:
 553                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 554                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 555                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 556                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 557                 *data = g_variant_builder_end(&gvb);
 558                 break;
 559         case SR_CONF_VOLTAGE_THRESHOLD:
 560                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 561                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 562                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 563                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 564                         gvar = g_variant_new_tuple(range, 2);
 565                         g_variant_builder_add_value(&gvb, gvar);
 566                 }
 567                 *data = g_variant_builder_end(&gvb);
 568                 break;
 569         default:
 570                 return SR_ERR_NA;
 571         }
 572
 573         return ret;
 574 }
 575
 576 static void abort_acquisition(struct dev_context *devc)
 577 {
 578         int i;
 579
 580         devc->num_samples = -1;
 581
 582         for (i = devc->num_transfers - 1; i >= 0; i--) {
 583                 if (devc->transfers[i])
 584                         libusb_cancel_transfer(devc->transfers[i]);
 585         }
 586 }
 587
 588 static unsigned int bytes_per_ms(struct dev_context *devc)
 589 {
 590         return devc->cur_samplerate * devc->num_channels / 8000;
 591 }
 592
 593 static size_t get_buffer_size(struct dev_context *devc)
 594 {
 595         size_t s;
 596
 597         /*
 598          * The buffer should be large enough to hold 10ms of data and
 599          * a multiple of 512.
 600          */
 601         s = 10 * bytes_per_ms(devc);
 602         return (s + 511) & ~511;
 603 }
 604
 605 static unsigned int get_number_of_transfers(struct dev_context *devc)
 606 {
 607         unsigned int n;
 608
 609         /* Total buffer size should be able to hold about 500ms of data. */
 610         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 611
 612         if (n > NUM_SIMUL_TRANSFERS)
 613                 return NUM_SIMUL_TRANSFERS;
 614
 615         return n;
 616 }
 617
 618 static unsigned int get_timeout(struct dev_context *devc)
 619 {
 620         size_t total_size;
 621         unsigned int timeout;
 622
 623         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 624         timeout = total_size / bytes_per_ms(devc);
 625         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 626 }
 627
 628 static int configure_probes(const struct sr_dev_inst *sdi)
 629 {
 630         struct dev_context *devc;
 631         struct sr_probe *probe;
 632         GSList *l;
 633         uint16_t probe_bit;
 634
 635         devc = sdi->priv;
 636
 637         devc->cur_channels = 0;
 638         devc->num_channels = 0;
 639         for (l = sdi->probes; l; l = l->next) {
 640                 probe = (struct sr_probe *)l->data;
 641                 if (probe->enabled == FALSE)
 642                         continue;
 643
 644                 probe_bit = 1 << (probe->index);
 645
 646                 devc->cur_channels |= probe_bit;
 647
 648 #ifdef WORDS_BIGENDIAN
 649                 /* Output logic data should be stored in little endian
 650                    format.  To speed things up during conversion, do the
 651                    switcharoo here instead. */
 652
 653                 probe_bit = 1 << (probe->index ^ 8);
 654 #endif
 655
 656                 devc->channel_masks[devc->num_channels ++] = probe_bit;
 657         }
 658
 659         return SR_OK;
 660 }
 661
 662 static int receive_data(int fd, int revents, void *cb_data)
 663 {
 664         struct timeval tv;
 665         struct dev_context *devc;
 666         struct drv_context *drvc;
 667         const struct sr_dev_inst *sdi;
 668
 669         (void)fd;
 670         (void)revents;
 671
 672         sdi = cb_data;
 673         drvc = di->priv;
 674         devc = sdi->priv;
 675
 676         tv.tv_sec = tv.tv_usec = 0;
 677         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 678
 679         if (devc->num_samples == -2) {
 680                 saleae_logic16_abort_acquisition(sdi);
 681                 abort_acquisition(devc);
 682         }
 683
 684         return TRUE;
 685 }
 686
 687 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 688                                  void *cb_data)
 689 {
 690         struct dev_context *devc;
 691         struct drv_context *drvc;
 692         struct sr_usb_dev_inst *usb;
 693         struct libusb_transfer *transfer;
 694         const struct libusb_pollfd **lupfd;
 695         unsigned int i, timeout, num_transfers;
 696         int ret;
 697         unsigned char *buf;
 698         size_t size, convsize;
 699
 700         if (sdi->status != SR_ST_ACTIVE)
 701                 return SR_ERR_DEV_CLOSED;
 702
 703         drvc = di->priv;
 704         devc = sdi->priv;
 705         usb = sdi->conn;
 706
 707         /* Configures devc->cur_channels */
 708         if (configure_probes(sdi) != SR_OK) {
 709                 sr_err("Failed to configure probes.");
 710                 return SR_ERR;
 711         }
 712
 713         devc->cb_data = cb_data;
 714         devc->num_samples = 0;
 715         devc->empty_transfer_count = 0;
 716         devc->cur_channel = 0;
 717         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 718
 719         timeout = get_timeout(devc);
 720         num_transfers = get_number_of_transfers(devc);
 721         size = get_buffer_size(devc);
 722         convsize = (size / devc->num_channels + 2) * 16;
 723         devc->submitted_transfers = 0;
 724         devc->usbfd = NULL;
 725
 726         devc->convbuffer_size = convsize;
 727         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 728                 sr_err("Conversion buffer malloc failed.");
 729                 return SR_ERR_MALLOC;
 730         }
 731
 732         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 733         if (!devc->transfers) {
 734                 sr_err("USB transfers malloc failed.");
 735                 g_free(devc->convbuffer);
 736                 return SR_ERR_MALLOC;
 737         }
 738
 739         if ((ret = saleae_logic16_setup_acquisition(sdi, devc->cur_samplerate,
 740                                                     devc->cur_channels)) != SR_OK) {
 741                 g_free(devc->transfers);
 742                 g_free(devc->convbuffer);
 743                 return ret;
 744         }
 745
 746         devc->num_transfers = num_transfers;
 747         for (i = 0; i < num_transfers; i++) {
 748                 if (!(buf = g_try_malloc(size))) {
 749                         sr_err("USB transfer buffer malloc failed.");
 750                         if (devc->submitted_transfers)
 751                                 abort_acquisition(devc);
 752                         else {
 753                                 g_free(devc->transfers);
 754                                 g_free(devc->convbuffer);
 755                         }
 756                         return SR_ERR_MALLOC;
 757                 }
 758                 transfer = libusb_alloc_transfer(0);
 759                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 760                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 761                                 saleae_logic16_receive_transfer, devc, timeout);
 762                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 763                         sr_err("Failed to submit transfer: %s.",
 764                                libusb_error_name(ret));
 765                         libusb_free_transfer(transfer);
 766                         g_free(buf);
 767                         abort_acquisition(devc);
 768                         return SR_ERR;
 769                 }
 770                 devc->transfers[i] = transfer;
 771                 devc->submitted_transfers++;
 772         }
 773
 774         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 775         for (i = 0; lupfd[i]; i++);
 776         if (!(devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1)))) {
 777                 abort_acquisition(devc);
 778                 free(lupfd);
 779                 return SR_ERR;
 780         }
 781         for (i = 0; lupfd[i]; i++) {
 782                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 783                               timeout, receive_data, (void *)sdi);
 784                 devc->usbfd[i] = lupfd[i]->fd;
 785         }
 786         devc->usbfd[i] = -1;
 787         free(lupfd);
 788
 789         /* Send header packet to the session bus. */
 790         std_session_send_df_header(cb_data, LOG_PREFIX);
 791
 792         if ((ret = saleae_logic16_start_acquisition(sdi)) != SR_OK) {
 793                 abort_acquisition(devc);
 794                 return ret;
 795         }
 796
 797         return SR_OK;
 798 }
 799
 800 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 801 {
 802         int ret;
 803
 804         (void)cb_data;
 805
 806         if (sdi->status != SR_ST_ACTIVE)
 807                 return SR_ERR_DEV_CLOSED;
 808
 809         ret = saleae_logic16_abort_acquisition(sdi);
 810
 811         abort_acquisition(sdi->priv);
 812
 813         return ret;
 814 }
 815
 816 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 817         .name = "saleae-logic16",
 818         .longname = "Saleae Logic16",
 819         .api_version = 1,
 820         .init = init,
 821         .cleanup = cleanup,
 822         .scan = scan,
 823         .dev_list = dev_list,
 824         .dev_clear = dev_clear,
 825         .config_get = config_get,
 826         .config_set = config_set,
 827         .config_list = config_list,
 828         .dev_open = dev_open,
 829         .dev_close = dev_close,
 830         .dev_acquisition_start = dev_acquisition_start,
 831         .dev_acquisition_stop = dev_acquisition_stop,
 832         .priv = NULL,
 833 };