src/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 <config.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <math.h>
  28 #include <libsigrok/libsigrok.h>
  29 #include "libsigrok-internal.h"
  30 #include "protocol.h"
  31
  32 #define LOGIC16_VID             0x21a9
  33 #define LOGIC16_PID             0x1001
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            "saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42 static const uint32_t scanopts[] = {
  43         SR_CONF_CONN,
  44 };
  45
  46 static const uint32_t drvopts[] = {
  47         SR_CONF_LOGIC_ANALYZER,
  48 };
  49
  50 static const uint32_t devopts[] = {
  51         SR_CONF_CONTINUOUS,
  52         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  53         SR_CONF_CONN | SR_CONF_GET,
  54         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  55         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  56         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  57         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  58 };
  59
  60 static const int32_t trigger_matches[] = {
  61         SR_TRIGGER_ZERO,
  62         SR_TRIGGER_ONE,
  63         SR_TRIGGER_RISING,
  64         SR_TRIGGER_FALLING,
  65         SR_TRIGGER_EDGE,
  66 };
  67
  68 static const char *channel_names[] = {
  69         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  70         "9", "10", "11", "12", "13", "14", "15",
  71 };
  72
  73 static const struct {
  74         enum voltage_range range;
  75 } thresholds_ranges[] = {
  76         { VOLTAGE_RANGE_18_33_V, },
  77         { VOLTAGE_RANGE_5_V, },
  78 };
  79
  80 static const double thresholds[][2] = {
  81         { 0.7, 1.4 },
  82         { 1.4, 3.6 },
  83 };
  84
  85 static const uint64_t samplerates[] = {
  86         SR_KHZ(500),
  87         SR_MHZ(1),
  88         SR_MHZ(2),
  89         SR_MHZ(4),
  90         SR_MHZ(5),
  91         SR_MHZ(8),
  92         SR_MHZ(10),
  93         SR_KHZ(12500),
  94         SR_MHZ(16),
  95         SR_MHZ(20),
  96         SR_MHZ(25),
  97         SR_MHZ(32),
  98         SR_MHZ(40),
  99         SR_MHZ(50),
 100         SR_MHZ(80),
 101         SR_MHZ(100),
 102 };
 103
 104 static gboolean check_conf_profile(libusb_device *dev)
 105 {
 106         struct libusb_device_descriptor des;
 107         struct libusb_device_handle *hdl;
 108         gboolean ret;
 109         unsigned char strdesc[64];
 110
 111         hdl = NULL;
 112         ret = FALSE;
 113         while (!ret) {
 114                 /* Assume the FW has not been loaded, unless proven wrong. */
 115                 libusb_get_device_descriptor(dev, &des);
 116
 117                 if (libusb_open(dev, &hdl) != 0)
 118                         break;
 119
 120                 if (libusb_get_string_descriptor_ascii(hdl,
 121                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 122                         break;
 123                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 124                         break;
 125
 126                 if (libusb_get_string_descriptor_ascii(hdl,
 127                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 128                         break;
 129                 if (strcmp((const char *)strdesc, "Logic S/16"))
 130                         break;
 131
 132                 /* If we made it here, it must be a configured Logic16. */
 133                 ret = TRUE;
 134         }
 135         if (hdl)
 136                 libusb_close(hdl);
 137
 138         return ret;
 139 }
 140
 141 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 142 {
 143         struct drv_context *drvc;
 144         struct dev_context *devc;
 145         struct sr_dev_inst *sdi;
 146         struct sr_usb_dev_inst *usb;
 147         struct sr_config *src;
 148         GSList *l, *devices, *conn_devices;
 149         struct libusb_device_descriptor des;
 150         libusb_device **devlist;
 151         unsigned int i, j;
 152         const char *conn;
 153         char connection_id[64];
 154
 155         drvc = di->context;
 156
 157         conn = NULL;
 158         for (l = options; l; l = l->next) {
 159                 src = l->data;
 160                 switch (src->key) {
 161                 case SR_CONF_CONN:
 162                         conn = g_variant_get_string(src->data, NULL);
 163                         break;
 164                 }
 165         }
 166         if (conn)
 167                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 168         else
 169                 conn_devices = NULL;
 170
 171         /* Find all Logic16 devices and upload firmware to them. */
 172         devices = NULL;
 173         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 174         for (i = 0; devlist[i]; i++) {
 175                 if (conn) {
 176                         usb = NULL;
 177                         for (l = conn_devices; l; l = l->next) {
 178                                 usb = l->data;
 179                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 180                                     && usb->address == libusb_get_device_address(devlist[i]))
 181                                         break;
 182                         }
 183                         if (!l)
 184                                 /* This device matched none of the ones that
 185                                  * matched the conn specification. */
 186                                 continue;
 187                 }
 188
 189                 libusb_get_device_descriptor(devlist[i], &des);
 190
 191                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 192
 193                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 194                         continue;
 195
 196                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 197                 sdi->status = SR_ST_INITIALIZING;
 198                 sdi->vendor = g_strdup("Saleae");
 199                 sdi->model = g_strdup("Logic16");
 200                 sdi->connection_id = g_strdup(connection_id);
 201
 202                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 203                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 204                                         channel_names[j]);
 205
 206                 devc = g_malloc0(sizeof(struct dev_context));
 207                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 208                 sdi->priv = devc;
 209                 devices = g_slist_append(devices, sdi);
 210
 211                 if (check_conf_profile(devlist[i])) {
 212                         /* Already has the firmware, so fix the new address. */
 213                         sr_dbg("Found a Logic16 device.");
 214                         sdi->status = SR_ST_INACTIVE;
 215                         sdi->inst_type = SR_INST_USB;
 216                         sdi->conn = sr_usb_dev_inst_new(
 217                                 libusb_get_bus_number(devlist[i]),
 218                                 libusb_get_device_address(devlist[i]), NULL);
 219                 } else {
 220                         if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 221                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
 222                                 /* Store when this device's FW was updated. */
 223                                 devc->fw_updated = g_get_monotonic_time();
 224                         else
 225                                 sr_err("Firmware upload failed.");
 226                         sdi->inst_type = SR_INST_USB;
 227                         sdi->conn = sr_usb_dev_inst_new(
 228                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 229                 }
 230         }
 231         libusb_free_device_list(devlist, 1);
 232         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 233
 234         return std_scan_complete(di, devices);
 235 }
 236
 237 static int logic16_dev_open(struct sr_dev_inst *sdi)
 238 {
 239         struct sr_dev_driver *di;
 240         libusb_device **devlist;
 241         struct sr_usb_dev_inst *usb;
 242         struct libusb_device_descriptor des;
 243         struct drv_context *drvc;
 244         int ret = SR_ERR, i, device_count;
 245         char connection_id[64];
 246
 247         di = sdi->driver;
 248         drvc = di->context;
 249         usb = sdi->conn;
 250
 251         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 252         if (device_count < 0) {
 253                 sr_err("Failed to get device list: %s.",
 254                        libusb_error_name(device_count));
 255                 return SR_ERR;
 256         }
 257
 258         for (i = 0; i < device_count; i++) {
 259                 libusb_get_device_descriptor(devlist[i], &des);
 260
 261                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 262                         continue;
 263
 264                 if ((sdi->status == SR_ST_INITIALIZING) ||
 265                                 (sdi->status == SR_ST_INACTIVE)) {
 266                         /*
 267                          * Check device by its physical USB bus/port address.
 268                          */
 269                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 270                         if (strcmp(sdi->connection_id, connection_id))
 271                                 /* This is not the one. */
 272                                 continue;
 273                 }
 274
 275                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 276                         if (usb->address == 0xff)
 277                                 /*
 278                                  * First time we touch this device after FW
 279                                  * upload, so we don't know the address yet.
 280                                  */
 281                                 usb->address = libusb_get_device_address(devlist[i]);
 282                 } else {
 283                         sr_err("Failed to open device: %s.",
 284                                libusb_error_name(ret));
 285                         ret = SR_ERR;
 286                         break;
 287                 }
 288
 289                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 290                 if (ret == LIBUSB_ERROR_BUSY) {
 291                         sr_err("Unable to claim USB interface. Another "
 292                                "program or driver has already claimed it.");
 293                         ret = SR_ERR;
 294                         break;
 295                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 296                         sr_err("Device has been disconnected.");
 297                         ret = SR_ERR;
 298                         break;
 299                 } else if (ret != 0) {
 300                         sr_err("Unable to claim interface: %s.",
 301                                libusb_error_name(ret));
 302                         ret = SR_ERR;
 303                         break;
 304                 }
 305
 306                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 307                         sr_err("Failed to init device.");
 308                         break;
 309                 }
 310
 311                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 312                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 313
 314                 ret = SR_OK;
 315
 316                 break;
 317         }
 318
 319         libusb_free_device_list(devlist, 1);
 320
 321         if (ret != SR_OK) {
 322                 if (usb->devhdl) {
 323                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 324                         libusb_close(usb->devhdl);
 325                         usb->devhdl = NULL;
 326                 }
 327                 return SR_ERR;
 328         }
 329
 330         return SR_OK;
 331 }
 332
 333 static int dev_open(struct sr_dev_inst *sdi)
 334 {
 335         struct dev_context *devc;
 336         int ret;
 337         int64_t timediff_us, timediff_ms;
 338
 339         devc = sdi->priv;
 340
 341         /*
 342          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 343          * milliseconds for the FX2 to renumerate.
 344          */
 345         ret = SR_ERR;
 346         if (devc->fw_updated > 0) {
 347                 sr_info("Waiting for device to reset.");
 348                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 349                 g_usleep(300 * 1000);
 350                 timediff_ms = 0;
 351                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 352                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 353                                 break;
 354                         g_usleep(100 * 1000);
 355
 356                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 357                         timediff_ms = timediff_us / 1000;
 358                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 359                 }
 360                 if (ret != SR_OK) {
 361                         sr_err("Device failed to renumerate.");
 362                         return SR_ERR;
 363                 }
 364                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 365         } else {
 366                 sr_info("Firmware upload was not needed.");
 367                 ret = logic16_dev_open(sdi);
 368         }
 369
 370         if (ret != SR_OK) {
 371                 sr_err("Unable to open device.");
 372                 return SR_ERR;
 373         }
 374
 375         if (devc->cur_samplerate == 0) {
 376                 /* Samplerate hasn't been set; default to the slowest one. */
 377                 devc->cur_samplerate = samplerates[0];
 378         }
 379
 380         return SR_OK;
 381 }
 382
 383 static int dev_close(struct sr_dev_inst *sdi)
 384 {
 385         struct sr_usb_dev_inst *usb;
 386
 387         usb = sdi->conn;
 388
 389         if (!usb->devhdl)
 390                 return SR_ERR_BUG;
 391
 392         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 393                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 394         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 395         libusb_close(usb->devhdl);
 396         usb->devhdl = NULL;
 397
 398         return SR_OK;
 399 }
 400
 401 static int config_get(uint32_t key, GVariant **data,
 402         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 403 {
 404         struct dev_context *devc;
 405         struct sr_usb_dev_inst *usb;
 406         unsigned int i;
 407
 408         (void)cg;
 409
 410         switch (key) {
 411         case SR_CONF_CONN:
 412                 if (!sdi || !sdi->conn)
 413                         return SR_ERR_ARG;
 414                 usb = sdi->conn;
 415                 if (usb->address == 255)
 416                         /* Device still needs to re-enumerate after firmware
 417                          * upload, so we don't know its (future) address. */
 418                         return SR_ERR;
 419                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 420                 break;
 421         case SR_CONF_SAMPLERATE:
 422                 if (!sdi)
 423                         return SR_ERR;
 424                 devc = sdi->priv;
 425                 *data = g_variant_new_uint64(devc->cur_samplerate);
 426                 break;
 427         case SR_CONF_CAPTURE_RATIO:
 428                 if (!sdi)
 429                         return SR_ERR;
 430                 devc = sdi->priv;
 431                 *data = g_variant_new_uint64(devc->capture_ratio);
 432                 break;
 433         case SR_CONF_VOLTAGE_THRESHOLD:
 434                 if (!sdi)
 435                         return SR_ERR;
 436                 devc = sdi->priv;
 437                 for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
 438                         if (devc->selected_voltage_range != thresholds_ranges[i].range)
 439                                 continue;
 440                         *data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
 441                         return SR_OK;
 442                 }
 443                 return SR_ERR;
 444         default:
 445                 return SR_ERR_NA;
 446         }
 447
 448         return SR_OK;
 449 }
 450
 451 static int config_set(uint32_t key, GVariant *data,
 452         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 453 {
 454         struct dev_context *devc;
 455         int idx;
 456
 457         (void)cg;
 458
 459         devc = sdi->priv;
 460
 461         switch (key) {
 462         case SR_CONF_SAMPLERATE:
 463                 devc->cur_samplerate = g_variant_get_uint64(data);
 464                 break;
 465         case SR_CONF_LIMIT_SAMPLES:
 466                 devc->limit_samples = g_variant_get_uint64(data);
 467                 break;
 468         case SR_CONF_CAPTURE_RATIO:
 469                 devc->capture_ratio = g_variant_get_uint64(data);
 470                 break;
 471         case SR_CONF_VOLTAGE_THRESHOLD:
 472                 if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
 473                         return SR_ERR_ARG;
 474                 devc->selected_voltage_range = thresholds_ranges[idx].range;
 475                 break;
 476         default:
 477                 return SR_ERR_NA;
 478         }
 479
 480         return SR_OK;
 481 }
 482
 483 static int config_list(uint32_t key, GVariant **data,
 484         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 485 {
 486         switch (key) {
 487         case SR_CONF_SCAN_OPTIONS:
 488         case SR_CONF_DEVICE_OPTIONS:
 489                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 490         case SR_CONF_SAMPLERATE:
 491                 *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 492                 break;
 493         case SR_CONF_VOLTAGE_THRESHOLD:
 494                 *data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
 495                 break;
 496         case SR_CONF_TRIGGER_MATCH:
 497                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 498                 break;
 499         default:
 500                 return SR_ERR_NA;
 501         }
 502
 503         return SR_OK;
 504 }
 505
 506 static void abort_acquisition(struct dev_context *devc)
 507 {
 508         int i;
 509
 510         devc->sent_samples = -1;
 511
 512         for (i = devc->num_transfers - 1; i >= 0; i--) {
 513                 if (devc->transfers[i])
 514                         libusb_cancel_transfer(devc->transfers[i]);
 515         }
 516 }
 517
 518 static unsigned int bytes_per_ms(struct dev_context *devc)
 519 {
 520         return devc->cur_samplerate * devc->num_channels / 8000;
 521 }
 522
 523 static size_t get_buffer_size(struct dev_context *devc)
 524 {
 525         size_t s;
 526
 527         /*
 528          * The buffer should be large enough to hold 10ms of data and
 529          * a multiple of 512.
 530          */
 531         s = 10 * bytes_per_ms(devc);
 532         return (s + 511) & ~511;
 533 }
 534
 535 static unsigned int get_number_of_transfers(struct dev_context *devc)
 536 {
 537         unsigned int n;
 538
 539         /* Total buffer size should be able to hold about 500ms of data. */
 540         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 541
 542         if (n > NUM_SIMUL_TRANSFERS)
 543                 return NUM_SIMUL_TRANSFERS;
 544
 545         return n;
 546 }
 547
 548 static unsigned int get_timeout(struct dev_context *devc)
 549 {
 550         size_t total_size;
 551         unsigned int timeout;
 552
 553         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 554         timeout = total_size / bytes_per_ms(devc);
 555         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 556 }
 557
 558 static int configure_channels(const struct sr_dev_inst *sdi)
 559 {
 560         struct dev_context *devc;
 561         struct sr_channel *ch;
 562         GSList *l;
 563         uint16_t channel_bit;
 564
 565         devc = sdi->priv;
 566
 567         devc->cur_channels = 0;
 568         devc->num_channels = 0;
 569         for (l = sdi->channels; l; l = l->next) {
 570                 ch = (struct sr_channel *)l->data;
 571                 if (ch->enabled == FALSE)
 572                         continue;
 573
 574                 channel_bit = 1 << (ch->index);
 575
 576                 devc->cur_channels |= channel_bit;
 577
 578 #ifdef WORDS_BIGENDIAN
 579                 /*
 580                  * Output logic data should be stored in little endian format.
 581                  * To speed things up during conversion, do the switcharoo
 582                  * here instead.
 583                  */
 584                 channel_bit = 1 << (ch->index ^ 8);
 585 #endif
 586
 587                 devc->channel_masks[devc->num_channels++] = channel_bit;
 588         }
 589
 590         return SR_OK;
 591 }
 592
 593 static int receive_data(int fd, int revents, void *cb_data)
 594 {
 595         struct timeval tv;
 596         struct dev_context *devc;
 597         struct drv_context *drvc;
 598         const struct sr_dev_inst *sdi;
 599         struct sr_dev_driver *di;
 600
 601         (void)fd;
 602         (void)revents;
 603
 604         sdi = cb_data;
 605         di = sdi->driver;
 606         drvc = di->context;
 607         devc = sdi->priv;
 608
 609         tv.tv_sec = tv.tv_usec = 0;
 610         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 611
 612         if (devc->sent_samples == -2) {
 613                 logic16_abort_acquisition(sdi);
 614                 abort_acquisition(devc);
 615         }
 616
 617         return TRUE;
 618 }
 619
 620 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 621 {
 622         struct sr_dev_driver *di = sdi->driver;
 623         struct dev_context *devc;
 624         struct drv_context *drvc;
 625         struct sr_usb_dev_inst *usb;
 626         struct sr_trigger *trigger;
 627         struct libusb_transfer *transfer;
 628         unsigned int i, timeout, num_transfers;
 629         int ret;
 630         unsigned char *buf;
 631         size_t size, convsize;
 632
 633         drvc = di->context;
 634         devc = sdi->priv;
 635         usb = sdi->conn;
 636
 637         /* Configures devc->cur_channels. */
 638         if (configure_channels(sdi) != SR_OK) {
 639                 sr_err("Failed to configure channels.");
 640                 return SR_ERR;
 641         }
 642
 643         devc->sent_samples = 0;
 644         devc->empty_transfer_count = 0;
 645         devc->cur_channel = 0;
 646         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 647
 648         if ((trigger = sr_session_trigger_get(sdi->session))) {
 649                 int pre_trigger_samples = 0;
 650                 if (devc->limit_samples > 0)
 651                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 652                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 653                 if (!devc->stl)
 654                         return SR_ERR_MALLOC;
 655                 devc->trigger_fired = FALSE;
 656         } else
 657                 devc->trigger_fired = TRUE;
 658
 659         timeout = get_timeout(devc);
 660         num_transfers = get_number_of_transfers(devc);
 661         size = get_buffer_size(devc);
 662         convsize = (size / devc->num_channels + 2) * 16;
 663         devc->submitted_transfers = 0;
 664
 665         devc->convbuffer_size = convsize;
 666         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 667                 sr_err("Conversion buffer malloc failed.");
 668                 return SR_ERR_MALLOC;
 669         }
 670
 671         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 672         if (!devc->transfers) {
 673                 sr_err("USB transfers malloc failed.");
 674                 g_free(devc->convbuffer);
 675                 return SR_ERR_MALLOC;
 676         }
 677
 678         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 679                                              devc->cur_channels)) != SR_OK) {
 680                 g_free(devc->transfers);
 681                 g_free(devc->convbuffer);
 682                 return ret;
 683         }
 684
 685         devc->num_transfers = num_transfers;
 686         for (i = 0; i < num_transfers; i++) {
 687                 if (!(buf = g_try_malloc(size))) {
 688                         sr_err("USB transfer buffer malloc failed.");
 689                         if (devc->submitted_transfers)
 690                                 abort_acquisition(devc);
 691                         else {
 692                                 g_free(devc->transfers);
 693                                 g_free(devc->convbuffer);
 694                         }
 695                         return SR_ERR_MALLOC;
 696                 }
 697                 transfer = libusb_alloc_transfer(0);
 698                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 699                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 700                                 logic16_receive_transfer, (void *)sdi, timeout);
 701                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 702                         sr_err("Failed to submit transfer: %s.",
 703                                libusb_error_name(ret));
 704                         libusb_free_transfer(transfer);
 705                         g_free(buf);
 706                         abort_acquisition(devc);
 707                         return SR_ERR;
 708                 }
 709                 devc->transfers[i] = transfer;
 710                 devc->submitted_transfers++;
 711         }
 712
 713         devc->ctx = drvc->sr_ctx;
 714
 715         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 716
 717         std_session_send_df_header(sdi);
 718
 719         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 720                 abort_acquisition(devc);
 721                 return ret;
 722         }
 723
 724         return SR_OK;
 725 }
 726
 727 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 728 {
 729         int ret;
 730
 731         ret = logic16_abort_acquisition(sdi);
 732
 733         abort_acquisition(sdi->priv);
 734
 735         return ret;
 736 }
 737
 738 static struct sr_dev_driver saleae_logic16_driver_info = {
 739         .name = "saleae-logic16",
 740         .longname = "Saleae Logic16",
 741         .api_version = 1,
 742         .init = std_init,
 743         .cleanup = std_cleanup,
 744         .scan = scan,
 745         .dev_list = std_dev_list,
 746         .dev_clear = std_dev_clear,
 747         .config_get = config_get,
 748         .config_set = config_set,
 749         .config_list = config_list,
 750         .dev_open = dev_open,
 751         .dev_close = dev_close,
 752         .dev_acquisition_start = dev_acquisition_start,
 753         .dev_acquisition_stop = dev_acquisition_stop,
 754         .context = NULL,
 755 };
 756 SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);